Add ALTS fuzzer

author: Yihua Zhang <yihuaz@google.com> 2018-05-08 10:15:03 -0700
committer: Yihua Zhang <yihuaz@google.com> 2018-05-08 10:15:03 -0700
commit: cc93663910cd17f6d1faeef020ec0b3fc27df263 (patch)
tree: af57bcf1d818c15f3e72f690ab67fc278296a0fe
parent: d8f35e95dc48b144c741e70dc90589c374854a64 (diff)
224 files changed, 4751 insertions, 95 deletions
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8db941239f..0374173b0b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -454,6 +454,7 @@ if(_gRPC_PLATFORM_LINUX OR _gRPC_PLATFORM_MAC OR _gRPC_PLATFORM_POSIX)
 add_dependencies(buildtests_c h2_uds_nosec_test)
 endif()
 add_dependencies(buildtests_c inproc_nosec_test)
+add_dependencies(buildtests_c alts_credentials_fuzzer_one_entry)
 add_dependencies(buildtests_c api_fuzzer_one_entry)
 add_dependencies(buildtests_c client_fuzzer_one_entry)
 add_dependencies(buildtests_c hpack_parser_fuzzer_test_one_entry)
@@ -1672,6 +1673,7 @@ add_library(grpc_test_util
   test/core/end2end/fixtures/proxy.cc
   test/core/iomgr/endpoint_tests.cc
   test/core/util/debugger_macros.cc
+  test/core/util/fuzzer_util.cc
   test/core/util/grpc_profiler.cc
   test/core/util/histogram.cc
   test/core/util/memory_counters.cc
@@ -1975,6 +1977,7 @@ add_library(grpc_test_util_unsecure
   test/core/end2end/fixtures/proxy.cc
   test/core/iomgr/endpoint_tests.cc
   test/core/util/debugger_macros.cc
+  test/core/util/fuzzer_util.cc
   test/core/util/grpc_profiler.cc
   test/core/util/histogram.cc
   test/core/util/memory_counters.cc
@@ -15712,6 +15715,35 @@ endif()
 endif (gRPC_BUILD_TESTS)
 if (gRPC_BUILD_TESTS)
 
+add_executable(alts_credentials_fuzzer_one_entry
+  test/core/security/alts_credentials_fuzzer.cc
+  test/core/util/one_corpus_entry_fuzzer.cc
+)
+
+
+target_include_directories(alts_credentials_fuzzer_one_entry
+  PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}
+  PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/include
+  PRIVATE ${_gRPC_SSL_INCLUDE_DIR}
+  PRIVATE ${_gRPC_PROTOBUF_INCLUDE_DIR}
+  PRIVATE ${_gRPC_ZLIB_INCLUDE_DIR}
+  PRIVATE ${_gRPC_BENCHMARK_INCLUDE_DIR}
+  PRIVATE ${_gRPC_CARES_INCLUDE_DIR}
+  PRIVATE ${_gRPC_GFLAGS_INCLUDE_DIR}
+  PRIVATE ${_gRPC_ADDRESS_SORTING_INCLUDE_DIR}
+)
+
+target_link_libraries(alts_credentials_fuzzer_one_entry
+  ${_gRPC_ALLTARGETS_LIBRARIES}
+  grpc_test_util
+  grpc
+  gpr_test_util
+  gpr
+)
+
+endif (gRPC_BUILD_TESTS)
+if (gRPC_BUILD_TESTS)
+
 add_executable(api_fuzzer_one_entry
   test/core/end2end/fuzzers/api_fuzzer.cc
   test/core/util/one_corpus_entry_fuzzer.cc
diff --git a/Makefile b/Makefile
index 0b2024996d..e00b57ed8d 100644
--- a/Makefile
+++ b/Makefile
@@ -960,6 +960,7 @@ stop:
 algorithm_test: $(BINDIR)/$(CONFIG)/algorithm_test
 alloc_test: $(BINDIR)/$(CONFIG)/alloc_test
 alpn_test: $(BINDIR)/$(CONFIG)/alpn_test
+alts_credentials_fuzzer: $(BINDIR)/$(CONFIG)/alts_credentials_fuzzer
 api_fuzzer: $(BINDIR)/$(CONFIG)/api_fuzzer
 arena_test: $(BINDIR)/$(CONFIG)/arena_test
 avl_test: $(BINDIR)/$(CONFIG)/avl_test
@@ -1325,6 +1326,7 @@ resolver_component_tests_runner_invoker_unsecure: $(BINDIR)/$(CONFIG)/resolver_c
 resolver_component_tests_runner_invoker: $(BINDIR)/$(CONFIG)/resolver_component_tests_runner_invoker
 address_sorting_test_unsecure: $(BINDIR)/$(CONFIG)/address_sorting_test_unsecure
 address_sorting_test: $(BINDIR)/$(CONFIG)/address_sorting_test
+alts_credentials_fuzzer_one_entry: $(BINDIR)/$(CONFIG)/alts_credentials_fuzzer_one_entry
 api_fuzzer_one_entry: $(BINDIR)/$(CONFIG)/api_fuzzer_one_entry
 client_fuzzer_one_entry: $(BINDIR)/$(CONFIG)/client_fuzzer_one_entry
 hpack_parser_fuzzer_test_one_entry: $(BINDIR)/$(CONFIG)/hpack_parser_fuzzer_test_one_entry
@@ -1571,6 +1573,7 @@ buildtests_c: privatelibs_c \
   $(BINDIR)/$(CONFIG)/h2_sockpair_1byte_nosec_test \
   $(BINDIR)/$(CONFIG)/h2_uds_nosec_test \
   $(BINDIR)/$(CONFIG)/inproc_nosec_test \
+  $(BINDIR)/$(CONFIG)/alts_credentials_fuzzer_one_entry \
   $(BINDIR)/$(CONFIG)/api_fuzzer_one_entry \
   $(BINDIR)/$(CONFIG)/client_fuzzer_one_entry \
   $(BINDIR)/$(CONFIG)/hpack_parser_fuzzer_test_one_entry \
@@ -4057,6 +4060,7 @@ LIBGRPC_TEST_UTIL_SRC = \
     test/core/end2end/fixtures/proxy.cc \
     test/core/iomgr/endpoint_tests.cc \
     test/core/util/debugger_macros.cc \
+    test/core/util/fuzzer_util.cc \
     test/core/util/grpc_profiler.cc \
     test/core/util/histogram.cc \
     test/core/util/memory_counters.cc \
@@ -4352,6 +4356,7 @@ LIBGRPC_TEST_UTIL_UNSECURE_SRC = \
     test/core/end2end/fixtures/proxy.cc \
     test/core/iomgr/endpoint_tests.cc \
     test/core/util/debugger_macros.cc \
+    test/core/util/fuzzer_util.cc \
     test/core/util/grpc_profiler.cc \
     test/core/util/histogram.cc \
     test/core/util/memory_counters.cc \
@@ -10226,6 +10231,38 @@ endif
 endif
 
 
+ALTS_CREDENTIALS_FUZZER_SRC = \
+    test/core/security/alts_credentials_fuzzer.cc \
+
+ALTS_CREDENTIALS_FUZZER_OBJS = $(addprefix $(OBJDIR)/$(CONFIG)/, $(addsuffix .o, $(basename $(ALTS_CREDENTIALS_FUZZER_SRC))))
+ifeq ($(NO_SECURE),true)
+
+# You can't build secure targets if you don't have OpenSSL.
+
+$(BINDIR)/$(CONFIG)/alts_credentials_fuzzer: openssl_dep_error
+
+else
+
+
+
+$(BINDIR)/$(CONFIG)/alts_credentials_fuzzer: $(ALTS_CREDENTIALS_FUZZER_OBJS) $(LIBDIR)/$(CONFIG)/libgrpc_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc.a $(LIBDIR)/$(CONFIG)/libgpr_test_util.a $(LIBDIR)/$(CONFIG)/libgpr.a
+	$(E) "[LD]      Linking $@"
+	$(Q) mkdir -p `dirname $@`
+	$(Q) $(LDXX) $(LDFLAGS) $(ALTS_CREDENTIALS_FUZZER_OBJS) $(LIBDIR)/$(CONFIG)/libgrpc_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc.a $(LIBDIR)/$(CONFIG)/libgpr_test_util.a $(LIBDIR)/$(CONFIG)/libgpr.a $(LDLIBS) $(LDLIBS_SECURE) -lFuzzer -o $(BINDIR)/$(CONFIG)/alts_credentials_fuzzer
+
+endif
+
+$(OBJDIR)/$(CONFIG)/test/core/security/alts_credentials_fuzzer.o:  $(LIBDIR)/$(CONFIG)/libgrpc_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc.a $(LIBDIR)/$(CONFIG)/libgpr_test_util.a $(LIBDIR)/$(CONFIG)/libgpr.a
+
+deps_alts_credentials_fuzzer: $(ALTS_CREDENTIALS_FUZZER_OBJS:.o=.dep)
+
+ifneq ($(NO_SECURE),true)
+ifneq ($(NO_DEPS),true)
+-include $(ALTS_CREDENTIALS_FUZZER_OBJS:.o=.dep)
+endif
+endif
+
+
 API_FUZZER_SRC = \
     test/core/end2end/fuzzers/api_fuzzer.cc \
 
@@ -23445,6 +23482,41 @@ endif
 endif
 
 
+ALTS_CREDENTIALS_FUZZER_ONE_ENTRY_SRC = \
+    test/core/security/alts_credentials_fuzzer.cc \
+    test/core/util/one_corpus_entry_fuzzer.cc \
+
+ALTS_CREDENTIALS_FUZZER_ONE_ENTRY_OBJS = $(addprefix $(OBJDIR)/$(CONFIG)/, $(addsuffix .o, $(basename $(ALTS_CREDENTIALS_FUZZER_ONE_ENTRY_SRC))))
+ifeq ($(NO_SECURE),true)
+
+# You can't build secure targets if you don't have OpenSSL.
+
+$(BINDIR)/$(CONFIG)/alts_credentials_fuzzer_one_entry: openssl_dep_error
+
+else
+
+
+
+$(BINDIR)/$(CONFIG)/alts_credentials_fuzzer_one_entry: $(ALTS_CREDENTIALS_FUZZER_ONE_ENTRY_OBJS) $(LIBDIR)/$(CONFIG)/libgrpc_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc.a $(LIBDIR)/$(CONFIG)/libgpr_test_util.a $(LIBDIR)/$(CONFIG)/libgpr.a
+	$(E) "[LD]      Linking $@"
+	$(Q) mkdir -p `dirname $@`
+	$(Q) $(LD) $(LDFLAGS) $(ALTS_CREDENTIALS_FUZZER_ONE_ENTRY_OBJS) $(LIBDIR)/$(CONFIG)/libgrpc_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc.a $(LIBDIR)/$(CONFIG)/libgpr_test_util.a $(LIBDIR)/$(CONFIG)/libgpr.a $(LDLIBS) $(LDLIBS_SECURE) -o $(BINDIR)/$(CONFIG)/alts_credentials_fuzzer_one_entry
+
+endif
+
+$(OBJDIR)/$(CONFIG)/test/core/security/alts_credentials_fuzzer.o:  $(LIBDIR)/$(CONFIG)/libgrpc_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc.a $(LIBDIR)/$(CONFIG)/libgpr_test_util.a $(LIBDIR)/$(CONFIG)/libgpr.a
+
+$(OBJDIR)/$(CONFIG)/test/core/util/one_corpus_entry_fuzzer.o:  $(LIBDIR)/$(CONFIG)/libgrpc_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc.a $(LIBDIR)/$(CONFIG)/libgpr_test_util.a $(LIBDIR)/$(CONFIG)/libgpr.a
+
+deps_alts_credentials_fuzzer_one_entry: $(ALTS_CREDENTIALS_FUZZER_ONE_ENTRY_OBJS:.o=.dep)
+
+ifneq ($(NO_SECURE),true)
+ifneq ($(NO_DEPS),true)
+-include $(ALTS_CREDENTIALS_FUZZER_ONE_ENTRY_OBJS:.o=.dep)
+endif
+endif
+
+
 API_FUZZER_ONE_ENTRY_SRC = \
     test/core/end2end/fuzzers/api_fuzzer.cc \
     test/core/util/one_corpus_entry_fuzzer.cc \
diff --git a/build.yaml b/build.yaml
index af8de14e61..1c5cd87d3f 100644
--- a/build.yaml
+++ b/build.yaml
@@ -827,6 +827,7 @@ filegroups:
   - test/core/end2end/fixtures/proxy.h
   - test/core/iomgr/endpoint_tests.h
   - test/core/util/debugger_macros.h
+  - test/core/util/fuzzer_util.h
   - test/core/util/grpc_profiler.h
   - test/core/util/histogram.h
   - test/core/util/memory_counters.h
@@ -846,6 +847,7 @@ filegroups:
   - test/core/end2end/fixtures/proxy.cc
   - test/core/iomgr/endpoint_tests.cc
   - test/core/util/debugger_macros.cc
+  - test/core/util/fuzzer_util.cc
   - test/core/util/grpc_profiler.cc
   - test/core/util/histogram.cc
   - test/core/util/memory_counters.cc
@@ -1991,6 +1993,19 @@ targets:
   - grpc
   - gpr_test_util
   - gpr
+- name: alts_credentials_fuzzer
+  build: fuzzer
+  language: c
+  src:
+  - test/core/security/alts_credentials_fuzzer.cc
+  deps:
+  - grpc_test_util
+  - grpc
+  - gpr_test_util
+  - gpr
+  corpus_dirs:
+  - test/core/security/corpus/alts_credentials_corpus
+  maxlen: 2048
 - name: api_fuzzer
   build: fuzzer
   language: c
diff --git a/gRPC-Core.podspec b/gRPC-Core.podspec
index e893eb9990..f6374ebfcd 100644
--- a/gRPC-Core.podspec
+++ b/gRPC-Core.podspec
@@ -1126,6 +1126,7 @@ Pod::Spec.new do |s|
                       'test/core/end2end/fixtures/proxy.cc',
                       'test/core/iomgr/endpoint_tests.cc',
                       'test/core/util/debugger_macros.cc',
+                      'test/core/util/fuzzer_util.cc',
                       'test/core/util/grpc_profiler.cc',
                       'test/core/util/histogram.cc',
                       'test/core/util/memory_counters.cc',
@@ -1148,6 +1149,7 @@ Pod::Spec.new do |s|
                       'test/core/end2end/fixtures/proxy.h',
                       'test/core/iomgr/endpoint_tests.h',
                       'test/core/util/debugger_macros.h',
+                      'test/core/util/fuzzer_util.h',
                       'test/core/util/grpc_profiler.h',
                       'test/core/util/histogram.h',
                       'test/core/util/memory_counters.h',
diff --git a/grpc.gyp b/grpc.gyp
index 0c567d9da4..fff7c5380a 100644
--- a/grpc.gyp
+++ b/grpc.gyp
@@ -577,6 +577,7 @@
         'test/core/end2end/fixtures/proxy.cc',
         'test/core/iomgr/endpoint_tests.cc',
         'test/core/util/debugger_macros.cc',
+        'test/core/util/fuzzer_util.cc',
         'test/core/util/grpc_profiler.cc',
         'test/core/util/histogram.cc',
         'test/core/util/memory_counters.cc',
@@ -807,6 +808,7 @@
         'test/core/end2end/fixtures/proxy.cc',
         'test/core/iomgr/endpoint_tests.cc',
         'test/core/util/debugger_macros.cc',
+        'test/core/util/fuzzer_util.cc',
         'test/core/util/grpc_profiler.cc',
         'test/core/util/histogram.cc',
         'test/core/util/memory_counters.cc',
diff --git a/test/core/end2end/fuzzers/api_fuzzer.cc b/test/core/end2end/fuzzers/api_fuzzer.cc
index 9ace7d04aa..36f257d6da 100644
--- a/test/core/end2end/fuzzers/api_fuzzer.cc
+++ b/test/core/end2end/fuzzers/api_fuzzer.cc
@@ -38,8 +38,14 @@
 #include "src/core/lib/surface/server.h"
 #include "src/core/lib/transport/metadata.h"
 #include "test/core/end2end/data/ssl_test_data.h"
+#include "test/core/util/fuzzer_util.h"
 #include "test/core/util/passthru_endpoint.h"
 
+using grpc_core::testing::grpc_fuzzer_get_next_byte;
+using grpc_core::testing::grpc_fuzzer_get_next_string;
+using grpc_core::testing::grpc_fuzzer_get_next_uint32;
+using grpc_core::testing::input_stream;
+
 ////////////////////////////////////////////////////////////////////////////////
 // logging
 
@@ -65,58 +71,20 @@ static gpr_timespec now_impl(gpr_clock_type clock_type) {
   return ts;
 }
 
-////////////////////////////////////////////////////////////////////////////////
-// input_stream: allows easy access to input bytes, and allows reading a little
-//               past the end (avoiding needing to check everywhere)
-
-typedef struct {
-  const uint8_t* cur;
-  const uint8_t* end;
-} input_stream;
-
-static uint8_t next_byte(input_stream* inp) {
-  if (inp->cur == inp->end) {
-    return 0;
-  }
-  return *inp->cur++;
-}
-
 static void end(input_stream* inp) { inp->cur = inp->end; }
 
-static char* read_string(input_stream* inp, bool* special) {
-  char* str = nullptr;
-  size_t cap = 0;
-  size_t sz = 0;
-  char c;
-  do {
-    if (cap == sz) {
-      cap = GPR_MAX(3 * cap / 2, cap + 8);
-      str = static_cast<char*>(gpr_realloc(str, cap));
-    }
-    c = static_cast<char>(next_byte(inp));
-    str[sz++] = c;
-  } while (c != 0 && c != 1);
-  if (special != nullptr) {
-    *special = (c == 1);
-  }
-  if (c == 1) {
-    str[sz - 1] = 0;
-  }
-  return str;
-}
-
 static void read_buffer(input_stream* inp, char** buffer, size_t* length,
                         bool* special) {
-  *length = next_byte(inp);
+  *length = grpc_fuzzer_get_next_byte(inp);
   if (*length == 255) {
     if (special != nullptr) *special = true;
-    *length = next_byte(inp);
+    *length = grpc_fuzzer_get_next_byte(inp);
   } else {
     if (special != nullptr) *special = false;
   }
   *buffer = static_cast<char*>(gpr_malloc(*length));
   for (size_t i = 0; i < *length; i++) {
-    (*buffer)[i] = static_cast<char>(next_byte(inp));
+    (*buffer)[i] = static_cast<char>(grpc_fuzzer_get_next_byte(inp));
   }
 }
 
@@ -128,7 +96,7 @@ static grpc_slice maybe_intern(grpc_slice s, bool intern) {
 
 static grpc_slice read_string_like_slice(input_stream* inp) {
   bool special;
-  char* s = read_string(inp, &special);
+  char* s = grpc_fuzzer_get_next_string(inp, &special);
   grpc_slice r = maybe_intern(grpc_slice_from_copied_string(s), special);
   gpr_free(s);
   return r;
@@ -146,39 +114,15 @@ static grpc_slice read_buffer_like_slice(input_stream* inp) {
 }
 
 static uint32_t read_uint22(input_stream* inp) {
-  uint8_t b = next_byte(inp);
+  uint8_t b = grpc_fuzzer_get_next_byte(inp);
   uint32_t x = b & 0x7f;
   if (b & 0x80) {
     x <<= 7;
-    b = next_byte(inp);
+    b = grpc_fuzzer_get_next_byte(inp);
     x |= b & 0x7f;
     if (b & 0x80) {
       x <<= 8;
-      x |= next_byte(inp);
-    }
-  }
-  return x;
-}
-
-static uint32_t read_uint32(input_stream* inp) {
-  uint8_t b = next_byte(inp);
-  uint32_t x = b & 0x7f;
-  if (b & 0x80) {
-    x <<= 7;
-    b = next_byte(inp);
-    x |= b & 0x7f;
-    if (b & 0x80) {
-      x <<= 7;
-      b = next_byte(inp);
-      x |= b & 0x7f;
-      if (b & 0x80) {
-        x <<= 7;
-        b = next_byte(inp);
-        x |= b & 0x7f;
-        if (b & 0x80) {
-          x = (x << 4) | (next_byte(inp) & 0x0f);
-        }
-      }
+      x |= grpc_fuzzer_get_next_byte(inp);
     }
   }
   return x;
@@ -193,22 +137,22 @@ static grpc_byte_buffer* read_message(input_stream* inp) {
 }
 
 static int read_int(input_stream* inp) {
-  return static_cast<int>(read_uint32(inp));
+  return static_cast<int>(grpc_fuzzer_get_next_uint32(inp));
 }
 
 static grpc_channel_args* read_args(input_stream* inp) {
-  size_t n = next_byte(inp);
+  size_t n = grpc_fuzzer_get_next_byte(inp);
   grpc_arg* args = static_cast<grpc_arg*>(gpr_malloc(sizeof(*args) * n));
   for (size_t i = 0; i < n; i++) {
-    switch (next_byte(inp)) {
+    switch (grpc_fuzzer_get_next_byte(inp)) {
       case 1:
         args[i].type = GRPC_ARG_STRING;
-        args[i].key = read_string(inp, nullptr);
-        args[i].value.string = read_string(inp, nullptr);
+        args[i].key = grpc_fuzzer_get_next_string(inp, nullptr);
+        args[i].value.string = grpc_fuzzer_get_next_string(inp, nullptr);
         break;
       case 2:
         args[i].type = GRPC_ARG_INTEGER;
-        args[i].key = read_string(inp, nullptr);
+        args[i].key = grpc_fuzzer_get_next_string(inp, nullptr);
         args[i].value.integer = read_int(inp);
         break;
       case 3:
@@ -249,10 +193,11 @@ static void cred_artifact_ctx_finish(cred_artifact_ctx* ctx) {
 static const char* read_cred_artifact(cred_artifact_ctx* ctx, input_stream* inp,
                                       const char** builtins,
                                       size_t num_builtins) {
-  uint8_t b = next_byte(inp);
+  uint8_t b = grpc_fuzzer_get_next_byte(inp);
   if (b == 0) return nullptr;
   if (b == 1)
-    return ctx->release[ctx->num_release++] = read_string(inp, nullptr);
+    return ctx->release[ctx->num_release++] =
+               grpc_fuzzer_get_next_string(inp, nullptr);
   if (b >= num_builtins + 1) {
     end(inp);
     return nullptr;
@@ -288,7 +233,7 @@ static grpc_call_credentials* read_call_creds(input_stream* inp, int depth) {
     end(inp);
     return nullptr;
   }
-  switch (next_byte(inp)) {
+  switch (grpc_fuzzer_get_next_byte(inp)) {
     default:
       end(inp);
       return nullptr;
@@ -339,7 +284,7 @@ static grpc_call_credentials* read_call_creds(input_stream* inp, int depth) {
 }
 
 static grpc_channel_credentials* read_channel_creds(input_stream* inp) {
-  switch (next_byte(inp)) {
+  switch (grpc_fuzzer_get_next_byte(inp)) {
     case 0:
       return read_ssl_channel_creds(inp);
       break;
@@ -673,7 +618,7 @@ static grpc_slice* add_slice_to_unref(call_state* call, grpc_slice s) {
 
 static void read_metadata(input_stream* inp, size_t* count,
                           grpc_metadata** metadata, call_state* cs) {
-  *count = next_byte(inp);
+  *count = grpc_fuzzer_get_next_byte(inp);
   if (*count) {
     *metadata =
         static_cast<grpc_metadata*>(gpr_malloc(*count * sizeof(**metadata)));
@@ -681,7 +626,7 @@ static void read_metadata(input_stream* inp, size_t* count,
     for (size_t i = 0; i < *count; i++) {
       (*metadata)[i].key = read_string_like_slice(inp);
       (*metadata)[i].value = read_buffer_like_slice(inp);
-      (*metadata)[i].flags = read_uint32(inp);
+      (*metadata)[i].flags = grpc_fuzzer_get_next_uint32(inp);
       add_slice_to_unref(cs, (*metadata)[i].key);
       add_slice_to_unref(cs, (*metadata)[i].value);
     }
@@ -811,7 +756,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
 
     grpc_timer_manager_tick();
 
-    switch (next_byte(&inp)) {
+    switch (grpc_fuzzer_get_next_byte(&inp)) {
       // terminate on bad bytes
       default:
         end(&inp);
@@ -838,13 +783,14 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
       // increment global time
       case 1: {
         g_now = gpr_time_add(
-            g_now, gpr_time_from_micros(read_uint32(&inp), GPR_TIMESPAN));
+            g_now, gpr_time_from_micros(grpc_fuzzer_get_next_uint32(&inp),
+                                        GPR_TIMESPAN));
         break;
       }
       // create an insecure channel
       case 2: {
         if (g_channel == nullptr) {
-          char* target = read_string(&inp, nullptr);
+          char* target = grpc_fuzzer_get_next_string(&inp, nullptr);
           char* target_uri;
           gpr_asprintf(&target_uri, "dns:%s", target);
           grpc_channel_args* args = read_args(&inp);
@@ -927,7 +873,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
       // check connectivity
       case 8: {
         if (g_channel != nullptr) {
-          uint8_t try_to_connect = next_byte(&inp);
+          uint8_t try_to_connect = grpc_fuzzer_get_next_byte(&inp);
           if (try_to_connect == 0 || try_to_connect == 1) {
             grpc_channel_check_connectivity_state(g_channel, try_to_connect);
           } else {
@@ -946,7 +892,8 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
           if (st != GRPC_CHANNEL_SHUTDOWN) {
             gpr_timespec deadline = gpr_time_add(
                 gpr_now(GPR_CLOCK_REALTIME),
-                gpr_time_from_micros(read_uint32(&inp), GPR_TIMESPAN));
+                gpr_time_from_micros(grpc_fuzzer_get_next_uint32(&inp),
+                                     GPR_TIMESPAN));
             grpc_channel_watch_connectivity_state(
                 g_channel, st, deadline, cq,
                 create_validator(validate_connectivity_watch,
@@ -971,7 +918,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
           }
           parent_call = g_active_call->call;
         }
-        uint32_t propagation_mask = read_uint32(&inp);
+        uint32_t propagation_mask = grpc_fuzzer_get_next_uint32(&inp);
         grpc_slice method = read_string_like_slice(&inp);
         if (GRPC_SLICE_LENGTH(method) == 0) {
           ok = false;
@@ -979,7 +926,8 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
         grpc_slice host = read_string_like_slice(&inp);
         gpr_timespec deadline =
             gpr_time_add(gpr_now(GPR_CLOCK_REALTIME),
-                         gpr_time_from_micros(read_uint32(&inp), GPR_TIMESPAN));
+                         gpr_time_from_micros(grpc_fuzzer_get_next_uint32(&inp),
+                                              GPR_TIMESPAN));
 
         if (ok) {
           call_state* cs = new_call(g_active_call, CLIENT);
@@ -1005,7 +953,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
           end(&inp);
           break;
         }
-        size_t num_ops = next_byte(&inp);
+        size_t num_ops = grpc_fuzzer_get_next_byte(&inp);
         if (num_ops > 6) {
           end(&inp);
           break;
@@ -1019,7 +967,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
         uint8_t has_ops = 0;
         for (i = 0; i < num_ops; i++) {
           op = &ops[i];
-          switch (next_byte(&inp)) {
+          switch (grpc_fuzzer_get_next_byte(&inp)) {
             default:
               /* invalid value */
               op->op = (grpc_op_type)-1;
@@ -1060,7 +1008,8 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
                   &op->data.send_status_from_server.trailing_metadata,
                   g_active_call);
               op->data.send_status_from_server.status =
-                  static_cast<grpc_status_code>(next_byte(&inp));
+                  static_cast<grpc_status_code>(
+                      grpc_fuzzer_get_next_byte(&inp));
               op->data.send_status_from_server.status_details =
                   add_slice_to_unref(g_active_call,
                                      read_buffer_like_slice(&inp));
@@ -1097,7 +1046,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
               break;
           }
           op->reserved = nullptr;
-          op->flags = read_uint32(&inp);
+          op->flags = grpc_fuzzer_get_next_uint32(&inp);
         }
         if (ok) {
           validator* v = make_finished_batch_validator(g_active_call, has_ops);
@@ -1160,14 +1109,14 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
       }
       // enable a tracer
       case 17: {
-        char* tracer = read_string(&inp, nullptr);
+        char* tracer = grpc_fuzzer_get_next_string(&inp, nullptr);
         grpc_tracer_set_enabled(tracer, 1);
         gpr_free(tracer);
         break;
       }
       // disable a tracer
       case 18: {
-        char* tracer = read_string(&inp, nullptr);
+        char* tracer = grpc_fuzzer_get_next_string(&inp, nullptr);
         grpc_tracer_set_enabled(tracer, 0);
         gpr_free(tracer);
         break;
@@ -1209,7 +1158,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
       // create a secure channel
       case 22: {
         if (g_channel == nullptr) {
-          char* target = read_string(&inp, nullptr);
+          char* target = grpc_fuzzer_get_next_string(&inp, nullptr);
           char* target_uri;
           gpr_asprintf(&target_uri, "dns:%s", target);
           grpc_channel_args* args = read_args(&inp);
diff --git a/test/core/security/BUILD b/test/core/security/BUILD
index 9db73b9123..70bcc8c9c3 100644
--- a/test/core/security/BUILD
+++ b/test/core/security/BUILD
@@ -21,6 +21,18 @@ grpc_package(name = "test/core/security")
 load("//test/core/util:grpc_fuzzer.bzl", "grpc_fuzzer")
 
 grpc_fuzzer(
+    name = "alts_credentials_fuzzer",
+    srcs = ["alts_credentials_fuzzer.cc"],
+    language = "C++",
+    corpus = "corpus/alts_credentials_corpus",
+    deps = [
+        "//:gpr",
+        "//:grpc",
+        "//test/core/util:grpc_test_util",
+    ],
+)
+
+grpc_fuzzer(
     name = "ssl_server_fuzzer",
     srcs = ["ssl_server_fuzzer.cc"],
     language = "C++",
diff --git a/test/core/security/alts_credentials_fuzzer.cc b/test/core/security/alts_credentials_fuzzer.cc
new file mode 100644
index 0000000000..bf18f0a589
--- /dev/null
+++ b/test/core/security/alts_credentials_fuzzer.cc
@@ -0,0 +1,120 @@
+/*
+ *
+ * Copyright 2018 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+#include <string.h>
+
+#include <grpc/grpc.h>
+#include <grpc/grpc_security.h>
+#include <grpc/support/alloc.h>
+#include <grpc/support/log.h>
+#include <grpc/support/string_util.h>
+#include "test/core/util/fuzzer_util.h"
+#include "test/core/util/memory_counters.h"
+
+#include "src/core/lib/gpr/env.h"
+#include "src/core/lib/security/credentials/alts/alts_credentials.h"
+#include "src/core/lib/security/credentials/alts/check_gcp_environment.h"
+#include "src/core/lib/security/credentials/alts/grpc_alts_credentials_options.h"
+
+using grpc_core::testing::grpc_fuzzer_get_next_byte;
+using grpc_core::testing::grpc_fuzzer_get_next_string;
+using grpc_core::testing::input_stream;
+
+// Logging
+bool squelch = true;
+bool leak_check = true;
+
+static void dont_log(gpr_log_func_args* args) {}
+
+// Add a random number of target service accounts to client options.
+static void read_target_service_accounts(
+    input_stream* inp, grpc_alts_credentials_options* options) {
+  size_t n = grpc_fuzzer_get_next_byte(inp);
+  for (size_t i = 0; i < n; i++) {
+    char* service_account = grpc_fuzzer_get_next_string(inp, nullptr);
+    if (service_account != nullptr) {
+      grpc_alts_credentials_client_options_add_target_service_account(
+          options, service_account);
+      gpr_free(service_account);
+    }
+  }
+  // Added to improve code coverage.
+  grpc_alts_credentials_client_options_add_target_service_account(options,
+                                                                  nullptr);
+  grpc_alts_credentials_client_options_add_target_service_account(
+      nullptr, "this is service account");
+}
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
+  char* grpc_trace_fuzzer = gpr_getenv("GRPC_TRACE_FUZZER");
+  if (squelch && grpc_trace_fuzzer == nullptr) {
+    gpr_set_log_function(dont_log);
+  }
+  gpr_free(grpc_trace_fuzzer);
+  struct grpc_memory_counters counters;
+  if (leak_check) {
+    grpc_memory_counters_init();
+  }
+  input_stream inp = {data, data + size};
+  grpc_init();
+  bool is_on_gcp = grpc_alts_is_running_on_gcp();
+  while (inp.cur != inp.end) {
+    bool enable_untrusted_alts = grpc_fuzzer_get_next_byte(&inp) & 0x01;
+    char* handshaker_service_url =
+        grpc_fuzzer_get_next_byte(&inp) & 0x01
+            ? grpc_fuzzer_get_next_string(&inp, nullptr)
+            : nullptr;
+    if (grpc_fuzzer_get_next_byte(&inp) & 0x01) {
+      // Test ALTS channel credentials.
+      grpc_alts_credentials_options* options =
+          grpc_alts_credentials_client_options_create();
+      read_target_service_accounts(&inp, options);
+      grpc_channel_credentials* cred = grpc_alts_credentials_create_customized(
+          options, handshaker_service_url, enable_untrusted_alts);
+      if (!enable_untrusted_alts && !is_on_gcp) {
+        GPR_ASSERT(cred == nullptr);
+      } else {
+        GPR_ASSERT(cred != nullptr);
+      }
+      grpc_channel_credentials_release(cred);
+      grpc_alts_credentials_options_destroy(options);
+    } else {
+      // Test ALTS server credentials.
+      grpc_alts_credentials_options* options =
+          grpc_alts_credentials_server_options_create();
+      grpc_server_credentials* cred =
+          grpc_alts_server_credentials_create_customized(
+              options, handshaker_service_url, enable_untrusted_alts);
+      if (!enable_untrusted_alts && !is_on_gcp) {
+        GPR_ASSERT(cred == nullptr);
+      } else {
+        GPR_ASSERT(cred != nullptr);
+      }
+      grpc_server_credentials_release(cred);
+      grpc_alts_credentials_options_destroy(options);
+    }
+    gpr_free(handshaker_service_url);
+  }
+  grpc_shutdown();
+  if (leak_check) {
+    counters = grpc_memory_counters_snapshot();
+    grpc_memory_counters_destroy();
+    GPR_ASSERT(counters.total_size_relative == 0);
+  }
+  return 0;
+}
diff --git a/test/core/security/corpus/alts_credentials_corpus/0149b46b88d583e05be0fb1423d10f2a14d36c48 b/test/core/security/corpus/alts_credentials_corpus/0149b46b88d583e05be0fb1423d10f2a14d36c48
new file mode 100644
index 0000000000..c062c7f179
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/0149b46b88d583e05be0fb1423d10f2a14d36c48
diff --git a/test/core/security/corpus/alts_credentials_corpus/047fc351e73f760d329d5a8845944720be9ce773 b/test/core/security/corpus/alts_credentials_corpus/047fc351e73f760d329d5a8845944720be9ce773
new file mode 100644
index 0000000000..d943cfeacd
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/047fc351e73f760d329d5a8845944720be9ce773
diff --git a/test/core/security/corpus/alts_credentials_corpus/04ef96c66d8222d1a2c07e6b2a6548e6a527042b b/test/core/security/corpus/alts_credentials_corpus/04ef96c66d8222d1a2c07e6b2a6548e6a527042b
new file mode 100644
index 0000000000..e7346f33ef
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/04ef96c66d8222d1a2c07e6b2a6548e6a527042b
diff --git a/test/core/security/corpus/alts_credentials_corpus/05a7e16c1d7f92111f43e9c777421879920e79a4 b/test/core/security/corpus/alts_credentials_corpus/05a7e16c1d7f92111f43e9c777421879920e79a4
new file mode 100644
index 0000000000..43b8b47d03
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/05a7e16c1d7f92111f43e9c777421879920e79a4
diff --git a/test/core/security/corpus/alts_credentials_corpus/063eb46f202fdfe7935c30ca38d7eb81c82db419 b/test/core/security/corpus/alts_credentials_corpus/063eb46f202fdfe7935c30ca38d7eb81c82db419
new file mode 100644
index 0000000000..5b30f12418
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/063eb46f202fdfe7935c30ca38d7eb81c82db419
diff --git a/test/core/security/corpus/alts_credentials_corpus/064773597c295fa871c184fc12d17b6de8aab31b b/test/core/security/corpus/alts_credentials_corpus/064773597c295fa871c184fc12d17b6de8aab31b
new file mode 100644
index 0000000000..758709b022
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/064773597c295fa871c184fc12d17b6de8aab31b
diff --git a/test/core/security/corpus/alts_credentials_corpus/087449740758b114d16790067707934479946bd6 b/test/core/security/corpus/alts_credentials_corpus/087449740758b114d16790067707934479946bd6
new file mode 100644
index 0000000000..099636f9ca
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/087449740758b114d16790067707934479946bd6
diff --git a/test/core/security/corpus/alts_credentials_corpus/0a5d068feb57a2782c6eba57b637abe8668ac82f b/test/core/security/corpus/alts_credentials_corpus/0a5d068feb57a2782c6eba57b637abe8668ac82f
new file mode 100644
index 0000000000..fd7d7c8ebc
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/0a5d068feb57a2782c6eba57b637abe8668ac82f
diff --git a/test/core/security/corpus/alts_credentials_corpus/0b81e6d89bf7df80e87e5ee7c49f7cc1431f77e8 b/test/core/security/corpus/alts_credentials_corpus/0b81e6d89bf7df80e87e5ee7c49f7cc1431f77e8
new file mode 100644
index 0000000000..a40664b4ef
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/0b81e6d89bf7df80e87e5ee7c49f7cc1431f77e8
diff --git a/test/core/security/corpus/alts_credentials_corpus/11409339cec708a5e353893101bfe76364337d5c b/test/core/security/corpus/alts_credentials_corpus/11409339cec708a5e353893101bfe76364337d5c
new file mode 100644
index 0000000000..c8b350d21c
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/11409339cec708a5e353893101bfe76364337d5c
diff --git a/test/core/security/corpus/alts_credentials_corpus/147696a264cd6f197adb7c68aff834c30b1b77f8 b/test/core/security/corpus/alts_credentials_corpus/147696a264cd6f197adb7c68aff834c30b1b77f8
new file mode 100644
index 0000000000..5f68d8a10f
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/147696a264cd6f197adb7c68aff834c30b1b77f8
@@ -0,0 +1 @@
+�+�
+\ No newline at end of file
diff --git a/test/core/security/corpus/alts_credentials_corpus/160e5cac38c5c9e919ed6e4fbafee76907d63044 b/test/core/security/corpus/alts_credentials_corpus/160e5cac38c5c9e919ed6e4fbafee76907d63044
new file mode 100644
index 0000000000..c11ad6674d
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/160e5cac38c5c9e919ed6e4fbafee76907d63044
diff --git a/test/core/security/corpus/alts_credentials_corpus/173d02167db431040b0540d98f6fc5e8b456587d b/test/core/security/corpus/alts_credentials_corpus/173d02167db431040b0540d98f6fc5e8b456587d
new file mode 100644
index 0000000000..662cc9bc79
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/173d02167db431040b0540d98f6fc5e8b456587d
@@ -0,0 +1 @@
+���
+\ No newline at end of file
diff --git a/test/core/security/corpus/alts_credentials_corpus/18a3fe239806b3c7d1af24bcd2bd23aeeb072d5c b/test/core/security/corpus/alts_credentials_corpus/18a3fe239806b3c7d1af24bcd2bd23aeeb072d5c
new file mode 100644
index 0000000000..9239e10f44
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/18a3fe239806b3c7d1af24bcd2bd23aeeb072d5c
diff --git a/test/core/security/corpus/alts_credentials_corpus/195abd83b2e9d32b1b5b854fe33da44b6db40880 b/test/core/security/corpus/alts_credentials_corpus/195abd83b2e9d32b1b5b854fe33da44b6db40880
new file mode 100644
index 0000000000..db7815ee2f
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/195abd83b2e9d32b1b5b854fe33da44b6db40880
@@ -0,0 +1 @@
+ap��~!��A~;�
+\ No newline at end of file
diff --git a/test/core/security/corpus/alts_credentials_corpus/19af2509c7d84334b9ec64de4767a07d5294fd72 b/test/core/security/corpus/alts_credentials_corpus/19af2509c7d84334b9ec64de4767a07d5294fd72
new file mode 100644
index 0000000000..b87c814597
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/19af2509c7d84334b9ec64de4767a07d5294fd72
diff --git a/test/core/security/corpus/alts_credentials_corpus/1b9864b948fcf08b062fd4401ef55b214c259535 b/test/core/security/corpus/alts_credentials_corpus/1b9864b948fcf08b062fd4401ef55b214c259535
new file mode 100644
index 0000000000..8cb97c5ea7
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/1b9864b948fcf08b062fd4401ef55b214c259535
diff --git a/test/core/security/corpus/alts_credentials_corpus/1edddfa67de854d7faaba41418fda845e9c6a89d b/test/core/security/corpus/alts_credentials_corpus/1edddfa67de854d7faaba41418fda845e9c6a89d
new file mode 100644
index 0000000000..035f07c06b
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/1edddfa67de854d7faaba41418fda845e9c6a89d
diff --git a/test/core/security/corpus/alts_credentials_corpus/20031bb00e6608e1b570aa96e6afb9de06d42167 b/test/core/security/corpus/alts_credentials_corpus/20031bb00e6608e1b570aa96e6afb9de06d42167
new file mode 100644
index 0000000000..27753dfa09
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/20031bb00e6608e1b570aa96e6afb9de06d42167
diff --git a/test/core/security/corpus/alts_credentials_corpus/22b4c7ce7db99b0df63c9eae9265de484b695922 b/test/core/security/corpus/alts_credentials_corpus/22b4c7ce7db99b0df63c9eae9265de484b695922
new file mode 100644
index 0000000000..ab8f18d934
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/22b4c7ce7db99b0df63c9eae9265de484b695922
diff --git a/test/core/security/corpus/alts_credentials_corpus/27416437ad287bd3cc1c5efdecebc39f20df73c1 b/test/core/security/corpus/alts_credentials_corpus/27416437ad287bd3cc1c5efdecebc39f20df73c1
new file mode 100644
index 0000000000..c400e3e3af
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/27416437ad287bd3cc1c5efdecebc39f20df73c1
@@ -0,0 +1 @@
+�=ļyyyyy��yyyyz
+\ No newline at end of file
diff --git a/test/core/security/corpus/alts_credentials_corpus/27e8cd785c2b9346f68dba75761b52fbabaf2b72 b/test/core/security/corpus/alts_credentials_corpus/27e8cd785c2b9346f68dba75761b52fbabaf2b72
new file mode 100644
index 0000000000..746dee96af
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/27e8cd785c2b9346f68dba75761b52fbabaf2b72
diff --git a/test/core/security/corpus/alts_credentials_corpus/28236f860d3d8e5ea11176746cb4c1c5c4f1f6c0 b/test/core/security/corpus/alts_credentials_corpus/28236f860d3d8e5ea11176746cb4c1c5c4f1f6c0
new file mode 100644
index 0000000000..982c97b1ed
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/28236f860d3d8e5ea11176746cb4c1c5c4f1f6c0
diff --git a/test/core/security/corpus/alts_credentials_corpus/29e15b492c5a409938092a30c003c5c34df7e283 b/test/core/security/corpus/alts_credentials_corpus/29e15b492c5a409938092a30c003c5c34df7e283
new file mode 100644
index 0000000000..c3e5b25e0d
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/29e15b492c5a409938092a30c003c5c34df7e283
diff --git a/test/core/security/corpus/alts_credentials_corpus/2a47864d77749aa042b772895dbdf46f608ccc6d b/test/core/security/corpus/alts_credentials_corpus/2a47864d77749aa042b772895dbdf46f608ccc6d
new file mode 100644
index 0000000000..141d94d982
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/2a47864d77749aa042b772895dbdf46f608ccc6d
diff --git a/test/core/security/corpus/alts_credentials_corpus/2cca5cb1b135c35f6e5e1ec4c37deb9e12d37dc0 b/test/core/security/corpus/alts_credentials_corpus/2cca5cb1b135c35f6e5e1ec4c37deb9e12d37dc0
new file mode 100644
index 0000000000..a956708b56
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/2cca5cb1b135c35f6e5e1ec4c37deb9e12d37dc0
@@ -0,0 +1,2 @@
+�
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diff --git a/test/core/security/corpus/alts_credentials_corpus/2df27b6c42dbaee382a29a87338d64ee87354acb b/test/core/security/corpus/alts_credentials_corpus/2df27b6c42dbaee382a29a87338d64ee87354acb
new file mode 100644
index 0000000000..a35f0e83cd
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/2df27b6c42dbaee382a29a87338d64ee87354acb
diff --git a/test/core/security/corpus/alts_credentials_corpus/2e9ddd1339d8e599cef658a08965985c4f45e428 b/test/core/security/corpus/alts_credentials_corpus/2e9ddd1339d8e599cef658a08965985c4f45e428
new file mode 100644
index 0000000000..17c98e7ca0
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/2e9ddd1339d8e599cef658a08965985c4f45e428
@@ -0,0 +1,2 @@
+�
+�e
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diff --git a/test/core/security/corpus/alts_credentials_corpus/31a2d12a84a7a56ace831a9668d6ab4847390679 b/test/core/security/corpus/alts_credentials_corpus/31a2d12a84a7a56ace831a9668d6ab4847390679
new file mode 100644
index 0000000000..745dc42bc0
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/31a2d12a84a7a56ace831a9668d6ab4847390679
@@ -0,0 +1,2 @@
+�
+��
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diff --git a/test/core/security/corpus/alts_credentials_corpus/33cb9ec0ce3538ed6079b5fcb127649a5d05955b b/test/core/security/corpus/alts_credentials_corpus/33cb9ec0ce3538ed6079b5fcb127649a5d05955b
new file mode 100644
index 0000000000..293176466e
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/33cb9ec0ce3538ed6079b5fcb127649a5d05955b
diff --git a/test/core/security/corpus/alts_credentials_corpus/348d9ae6eebb2e1644addf7f07231d108cf6f3b8 b/test/core/security/corpus/alts_credentials_corpus/348d9ae6eebb2e1644addf7f07231d108cf6f3b8
new file mode 100644
index 0000000000..02326f0b69
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/348d9ae6eebb2e1644addf7f07231d108cf6f3b8
@@ -0,0 +1 @@
+���
+\ No newline at end of file
diff --git a/test/core/security/corpus/alts_credentials_corpus/359f76f3c802292e92b0640de2bfe051e780a3b6 b/test/core/security/corpus/alts_credentials_corpus/359f76f3c802292e92b0640de2bfe051e780a3b6
new file mode 100644
index 0000000000..f31c54bad8
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/359f76f3c802292e92b0640de2bfe051e780a3b6
diff --git a/test/core/security/corpus/alts_credentials_corpus/35a479988e965a6e3e75138b64b0bd1f45073e2f b/test/core/security/corpus/alts_credentials_corpus/35a479988e965a6e3e75138b64b0bd1f45073e2f
new file mode 100644
index 0000000000..4e44bcc27f
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/35a479988e965a6e3e75138b64b0bd1f45073e2f
diff --git a/test/core/security/corpus/alts_credentials_corpus/362b00d713686ff70cb0199f3d7d0058e5a1a27a b/test/core/security/corpus/alts_credentials_corpus/362b00d713686ff70cb0199f3d7d0058e5a1a27a
new file mode 100644
index 0000000000..3e22fca175
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/362b00d713686ff70cb0199f3d7d0058e5a1a27a
diff --git a/test/core/security/corpus/alts_credentials_corpus/3849c1625071791ceae709b9c6c705b28d099d67 b/test/core/security/corpus/alts_credentials_corpus/3849c1625071791ceae709b9c6c705b28d099d67
new file mode 100644
index 0000000000..5bc905de15
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/3849c1625071791ceae709b9c6c705b28d099d67
diff --git a/test/core/security/corpus/alts_credentials_corpus/39ef03c66ee2d4bcfb6c8da50486dcd40f02fb12 b/test/core/security/corpus/alts_credentials_corpus/39ef03c66ee2d4bcfb6c8da50486dcd40f02fb12
new file mode 100644
index 0000000000..467004c97d
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/39ef03c66ee2d4bcfb6c8da50486dcd40f02fb12
diff --git a/test/core/security/corpus/alts_credentials_corpus/3a3ca061863499ebc171a4f910fa1b49523baad4 b/test/core/security/corpus/alts_credentials_corpus/3a3ca061863499ebc171a4f910fa1b49523baad4
new file mode 100644
index 0000000000..97f09bf5c7
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/3a3ca061863499ebc171a4f910fa1b49523baad4
@@ -0,0 +1 @@
+���9
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diff --git a/test/core/security/corpus/alts_credentials_corpus/3a890f3fd01b048ac9db65a9a9b4f4443268b91a b/test/core/security/corpus/alts_credentials_corpus/3a890f3fd01b048ac9db65a9a9b4f4443268b91a
new file mode 100644
index 0000000000..97b05e80ba
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/3a890f3fd01b048ac9db65a9a9b4f4443268b91a
diff --git a/test/core/security/corpus/alts_credentials_corpus/3b9554038a425bd1fae057ba41f9366bb467e946 b/test/core/security/corpus/alts_credentials_corpus/3b9554038a425bd1fae057ba41f9366bb467e946
new file mode 100644
index 0000000000..d0ef6342d0
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/3b9554038a425bd1fae057ba41f9366bb467e946
@@ -0,0 +1 @@
+���������������������������������������������
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diff --git a/test/core/security/corpus/alts_credentials_corpus/3ce0ae4aa226f205a3a4e66bbb253419d9d754bf b/test/core/security/corpus/alts_credentials_corpus/3ce0ae4aa226f205a3a4e66bbb253419d9d754bf
new file mode 100644
index 0000000000..08e6df0ee2
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/3ce0ae4aa226f205a3a4e66bbb253419d9d754bf
diff --git a/test/core/security/corpus/alts_credentials_corpus/3dccc5523986c37e27684659bba8a1037e7a92e8 b/test/core/security/corpus/alts_credentials_corpus/3dccc5523986c37e27684659bba8a1037e7a92e8
new file mode 100644
index 0000000000..09b735e831
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/3dccc5523986c37e27684659bba8a1037e7a92e8
diff --git a/test/core/security/corpus/alts_credentials_corpus/3e0908c15b1cede4541d25f388b1345e8641e221 b/test/core/security/corpus/alts_credentials_corpus/3e0908c15b1cede4541d25f388b1345e8641e221
new file mode 100644
index 0000000000..eabd458c03
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/3e0908c15b1cede4541d25f388b1345e8641e221
diff --git a/test/core/security/corpus/alts_credentials_corpus/3fcb181ff6a8c8e2ba38ed34cf78f7482eb55cb7 b/test/core/security/corpus/alts_credentials_corpus/3fcb181ff6a8c8e2ba38ed34cf78f7482eb55cb7
new file mode 100644
index 0000000000..bbef93b5ad
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/3fcb181ff6a8c8e2ba38ed34cf78f7482eb55cb7
diff --git a/test/core/security/corpus/alts_credentials_corpus/41c9b5f720eb8f8fa04c840375a881781a849b43 b/test/core/security/corpus/alts_credentials_corpus/41c9b5f720eb8f8fa04c840375a881781a849b43
new file mode 100644
index 0000000000..d611c732db
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/41c9b5f720eb8f8fa04c840375a881781a849b43
diff --git a/test/core/security/corpus/alts_credentials_corpus/4257a018f08f13a3a9adc848ef808e1be50bc4cf b/test/core/security/corpus/alts_credentials_corpus/4257a018f08f13a3a9adc848ef808e1be50bc4cf
new file mode 100644
index 0000000000..607c97117a
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/4257a018f08f13a3a9adc848ef808e1be50bc4cf
@@ -0,0 +1,2 @@
+��99999999999999999999999999999999999����������������������/////������������������
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diff --git a/test/core/security/corpus/alts_credentials_corpus/42dfc5c4d13261b7259e65cd692df9c9d607194e b/test/core/security/corpus/alts_credentials_corpus/42dfc5c4d13261b7259e65cd692df9c9d607194e
new file mode 100644
index 0000000000..48ffa853fb
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/42dfc5c4d13261b7259e65cd692df9c9d607194e
diff --git a/test/core/security/corpus/alts_credentials_corpus/43144664aedb585d45d42aa5249ddbfe81afe470 b/test/core/security/corpus/alts_credentials_corpus/43144664aedb585d45d42aa5249ddbfe81afe470
new file mode 100644
index 0000000000..fee2672260
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/43144664aedb585d45d42aa5249ddbfe81afe470
diff --git a/test/core/security/corpus/alts_credentials_corpus/43e5ad495a47593b17dbcbd3e70c2e25a417bb6e b/test/core/security/corpus/alts_credentials_corpus/43e5ad495a47593b17dbcbd3e70c2e25a417bb6e
new file mode 100644
index 0000000000..32ffc96267
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/43e5ad495a47593b17dbcbd3e70c2e25a417bb6e
diff --git a/test/core/security/corpus/alts_credentials_corpus/446614e45b7bef49118b17e031c48faf167ebe3e b/test/core/security/corpus/alts_credentials_corpus/446614e45b7bef49118b17e031c48faf167ebe3e
new file mode 100644
index 0000000000..849aadf08a
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/446614e45b7bef49118b17e031c48faf167ebe3e
diff --git a/test/core/security/corpus/alts_credentials_corpus/46492477fa84ca88e85df914801af0b09b0939f6 b/test/core/security/corpus/alts_credentials_corpus/46492477fa84ca88e85df914801af0b09b0939f6
new file mode 100644
index 0000000000..98885bcde8
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/46492477fa84ca88e85df914801af0b09b0939f6
diff --git a/test/core/security/corpus/alts_credentials_corpus/47157f83b166b57e0052c98a65c6db864fa6cb9b b/test/core/security/corpus/alts_credentials_corpus/47157f83b166b57e0052c98a65c6db864fa6cb9b
new file mode 100644
index 0000000000..fad1e0faf1
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/47157f83b166b57e0052c98a65c6db864fa6cb9b
diff --git a/test/core/security/corpus/alts_credentials_corpus/473fc9b6d768a925527d3ad805ca363d490dc741 b/test/core/security/corpus/alts_credentials_corpus/473fc9b6d768a925527d3ad805ca363d490dc741
new file mode 100644
index 0000000000..1775a17df6
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/473fc9b6d768a925527d3ad805ca363d490dc741
diff --git a/test/core/security/corpus/alts_credentials_corpus/483c0b4015100eee00f6b23d1100d8c4953dd3b1 b/test/core/security/corpus/alts_credentials_corpus/483c0b4015100eee00f6b23d1100d8c4953dd3b1
new file mode 100644
index 0000000000..2d52687fda
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/483c0b4015100eee00f6b23d1100d8c4953dd3b1
diff --git a/test/core/security/corpus/alts_credentials_corpus/48be2dc4cdc5462407b319caa855d976cda88153 b/test/core/security/corpus/alts_credentials_corpus/48be2dc4cdc5462407b319caa855d976cda88153
new file mode 100644
index 0000000000..c1c2cd98cf
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/48be2dc4cdc5462407b319caa855d976cda88153
diff --git a/test/core/security/corpus/alts_credentials_corpus/4e84eb54a0e438052b0c2e83653135042d9eb59a b/test/core/security/corpus/alts_credentials_corpus/4e84eb54a0e438052b0c2e83653135042d9eb59a
new file mode 100644
index 0000000000..66b525f713
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/4e84eb54a0e438052b0c2e83653135042d9eb59a
@@ -0,0 +1 @@
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diff --git a/test/core/security/corpus/alts_credentials_corpus/50839d5c8bf33f0970986dcc4b73b024f11a95b7 b/test/core/security/corpus/alts_credentials_corpus/50839d5c8bf33f0970986dcc4b73b024f11a95b7
new file mode 100644
index 0000000000..9673f73c62
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/50839d5c8bf33f0970986dcc4b73b024f11a95b7
@@ -0,0 +1 @@
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diff --git a/test/core/security/corpus/alts_credentials_corpus/523d964986d8ad966ae07e540a608681098813f9 b/test/core/security/corpus/alts_credentials_corpus/523d964986d8ad966ae07e540a608681098813f9
new file mode 100644
index 0000000000..06e05df73e
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/523d964986d8ad966ae07e540a608681098813f9
diff --git a/test/core/security/corpus/alts_credentials_corpus/5410b8190c95dacd36d6e6ec75b7538a630e08de b/test/core/security/corpus/alts_credentials_corpus/5410b8190c95dacd36d6e6ec75b7538a630e08de
new file mode 100644
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--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/5410b8190c95dacd36d6e6ec75b7538a630e08de
diff --git a/test/core/security/corpus/alts_credentials_corpus/549b2891ac79f504a7c9ea00f6d7527c34ce04e6 b/test/core/security/corpus/alts_credentials_corpus/549b2891ac79f504a7c9ea00f6d7527c34ce04e6
new file mode 100644
index 0000000000..6f1a9ed509
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/549b2891ac79f504a7c9ea00f6d7527c34ce04e6
diff --git a/test/core/security/corpus/alts_credentials_corpus/55321649e7b7f1b5664ae20724e683c930643fc4 b/test/core/security/corpus/alts_credentials_corpus/55321649e7b7f1b5664ae20724e683c930643fc4
new file mode 100644
index 0000000000..e38fd28e17
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/55321649e7b7f1b5664ae20724e683c930643fc4
@@ -0,0 +1 @@
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diff --git a/test/core/security/corpus/alts_credentials_corpus/55cc52f25865baee3e6e52c3110a9723caa2b3cb b/test/core/security/corpus/alts_credentials_corpus/55cc52f25865baee3e6e52c3110a9723caa2b3cb
new file mode 100644
index 0000000000..aae2fe5fe0
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/55cc52f25865baee3e6e52c3110a9723caa2b3cb
@@ -0,0 +1 @@
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diff --git a/test/core/security/corpus/alts_credentials_corpus/56c22410e3295ad03aa31552ab888f581756cc17 b/test/core/security/corpus/alts_credentials_corpus/56c22410e3295ad03aa31552ab888f581756cc17
new file mode 100644
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--- /dev/null
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diff --git a/test/core/security/corpus/alts_credentials_corpus/5724a705b62a7548ba2df1abe4ef0c970c4e1bd2 b/test/core/security/corpus/alts_credentials_corpus/5724a705b62a7548ba2df1abe4ef0c970c4e1bd2
new file mode 100644
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--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/5724a705b62a7548ba2df1abe4ef0c970c4e1bd2
diff --git a/test/core/security/corpus/alts_credentials_corpus/576a148c107d56861d1611641a6f7c7921061c5c b/test/core/security/corpus/alts_credentials_corpus/576a148c107d56861d1611641a6f7c7921061c5c
new file mode 100644
index 0000000000..6d91b58071
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/576a148c107d56861d1611641a6f7c7921061c5c
diff --git a/test/core/security/corpus/alts_credentials_corpus/5a6b8263e8939f851cf5b1e347a33d97253b7b3d b/test/core/security/corpus/alts_credentials_corpus/5a6b8263e8939f851cf5b1e347a33d97253b7b3d
new file mode 100644
index 0000000000..add56cac16
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/5a6b8263e8939f851cf5b1e347a33d97253b7b3d
diff --git a/test/core/security/corpus/alts_credentials_corpus/5ba93c9db0cff93f52b521d7420e43f6eda2784f b/test/core/security/corpus/alts_credentials_corpus/5ba93c9db0cff93f52b521d7420e43f6eda2784f
new file mode 100644
index 0000000000..f76dd238ad
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/5ba93c9db0cff93f52b521d7420e43f6eda2784f
diff --git a/test/core/security/corpus/alts_credentials_corpus/5bd02a339fd7705449388580c75bfcc597aba954 b/test/core/security/corpus/alts_credentials_corpus/5bd02a339fd7705449388580c75bfcc597aba954
new file mode 100644
index 0000000000..f450932939
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/5bd02a339fd7705449388580c75bfcc597aba954
diff --git a/test/core/security/corpus/alts_credentials_corpus/5bd6fb6fc4163bf3a9db6ddaf509dce8df8a5000 b/test/core/security/corpus/alts_credentials_corpus/5bd6fb6fc4163bf3a9db6ddaf509dce8df8a5000
new file mode 100644
index 0000000000..aea3da6970
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/5bd6fb6fc4163bf3a9db6ddaf509dce8df8a5000
@@ -0,0 +1 @@
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diff --git a/test/core/security/corpus/alts_credentials_corpus/5d06fc38005503af3d084721c60e574fb9d2f370 b/test/core/security/corpus/alts_credentials_corpus/5d06fc38005503af3d084721c60e574fb9d2f370
new file mode 100644
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--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/5d06fc38005503af3d084721c60e574fb9d2f370
@@ -0,0 +1 @@
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diff --git a/test/core/security/corpus/alts_credentials_corpus/5ddc10489ff3269bdaa3051b70fb7af455ee1104 b/test/core/security/corpus/alts_credentials_corpus/5ddc10489ff3269bdaa3051b70fb7af455ee1104
new file mode 100644
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--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/5ddc10489ff3269bdaa3051b70fb7af455ee1104
diff --git a/test/core/security/corpus/alts_credentials_corpus/5ea9d515f0d10b04f1356b9463139bfe121a6e4a b/test/core/security/corpus/alts_credentials_corpus/5ea9d515f0d10b04f1356b9463139bfe121a6e4a
new file mode 100644
index 0000000000..7efb47e7c8
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/5ea9d515f0d10b04f1356b9463139bfe121a6e4a
diff --git a/test/core/security/corpus/alts_credentials_corpus/61c449793347cf2e1ed0c38d54d23c63dfaabeb8 b/test/core/security/corpus/alts_credentials_corpus/61c449793347cf2e1ed0c38d54d23c63dfaabeb8
new file mode 100644
index 0000000000..96031be7fc
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/61c449793347cf2e1ed0c38d54d23c63dfaabeb8
@@ -0,0 +1 @@
+����������������������������������������������
+\ No newline at end of file
diff --git a/test/core/security/corpus/alts_credentials_corpus/6287389c373e9788dcc04f9747b4be1fd1ef3028 b/test/core/security/corpus/alts_credentials_corpus/6287389c373e9788dcc04f9747b4be1fd1ef3028
new file mode 100644
index 0000000000..799bd0e6b0
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/6287389c373e9788dcc04f9747b4be1fd1ef3028
diff --git a/test/core/security/corpus/alts_credentials_corpus/64d4de4d5aafab7ec388a7fe83066c1a4d1d9d68 b/test/core/security/corpus/alts_credentials_corpus/64d4de4d5aafab7ec388a7fe83066c1a4d1d9d68
new file mode 100644
index 0000000000..2e91965059
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/64d4de4d5aafab7ec388a7fe83066c1a4d1d9d68
diff --git a/test/core/security/corpus/alts_credentials_corpus/651c37806d2ac579dcfc97643c3c1ea74dbb8774 b/test/core/security/corpus/alts_credentials_corpus/651c37806d2ac579dcfc97643c3c1ea74dbb8774
new file mode 100644
index 0000000000..618e514ec3
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/651c37806d2ac579dcfc97643c3c1ea74dbb8774
diff --git a/test/core/security/corpus/alts_credentials_corpus/6551d02d20573cfa2944ec1f12b0c01f264a1326 b/test/core/security/corpus/alts_credentials_corpus/6551d02d20573cfa2944ec1f12b0c01f264a1326
new file mode 100644
index 0000000000..98056c073e
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/6551d02d20573cfa2944ec1f12b0c01f264a1326
@@ -0,0 +1 @@
+�s
+\ No newline at end of file
diff --git a/test/core/security/corpus/alts_credentials_corpus/65f029414ee10e45ff4b9f305f7b472364cea538 b/test/core/security/corpus/alts_credentials_corpus/65f029414ee10e45ff4b9f305f7b472364cea538
new file mode 100644
index 0000000000..1c3a1a0d28
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/65f029414ee10e45ff4b9f305f7b472364cea538
diff --git a/test/core/security/corpus/alts_credentials_corpus/68b75a17fe2db060df3e61a597650ba99079abbf b/test/core/security/corpus/alts_credentials_corpus/68b75a17fe2db060df3e61a597650ba99079abbf
new file mode 100644
index 0000000000..327dd390b9
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/68b75a17fe2db060df3e61a597650ba99079abbf
diff --git a/test/core/security/corpus/alts_credentials_corpus/69e80594dbc5c4c648e39883a650b1760f20ab63 b/test/core/security/corpus/alts_credentials_corpus/69e80594dbc5c4c648e39883a650b1760f20ab63
new file mode 100644
index 0000000000..740b987b48
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/69e80594dbc5c4c648e39883a650b1760f20ab63
diff --git a/test/core/security/corpus/alts_credentials_corpus/6cb47d0e640b4c41e32f13c0d64ee46eae1b80b5 b/test/core/security/corpus/alts_credentials_corpus/6cb47d0e640b4c41e32f13c0d64ee46eae1b80b5
new file mode 100644
index 0000000000..b22a010648
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/6cb47d0e640b4c41e32f13c0d64ee46eae1b80b5
diff --git a/test/core/security/corpus/alts_credentials_corpus/6da5fe063432cb9094c7c083efdbbe5ba4246d18 b/test/core/security/corpus/alts_credentials_corpus/6da5fe063432cb9094c7c083efdbbe5ba4246d18
new file mode 100644
index 0000000000..993620ed92
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/6da5fe063432cb9094c7c083efdbbe5ba4246d18
diff --git a/test/core/security/corpus/alts_credentials_corpus/6dd140da774d85f272fb587dc1b2a85d881a7c21 b/test/core/security/corpus/alts_credentials_corpus/6dd140da774d85f272fb587dc1b2a85d881a7c21
new file mode 100644
index 0000000000..d838739e6c
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/6dd140da774d85f272fb587dc1b2a85d881a7c21
diff --git a/test/core/security/corpus/alts_credentials_corpus/6ddab273597d73be49e2307d68e00fa18bba4765 b/test/core/security/corpus/alts_credentials_corpus/6ddab273597d73be49e2307d68e00fa18bba4765
new file mode 100644
index 0000000000..3e74467a38
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/6ddab273597d73be49e2307d68e00fa18bba4765
diff --git a/test/core/security/corpus/alts_credentials_corpus/6eaf85d84fbf47ea0619d0dba8d366f4e3ff0be6 b/test/core/security/corpus/alts_credentials_corpus/6eaf85d84fbf47ea0619d0dba8d366f4e3ff0be6
new file mode 100644
index 0000000000..42cddf7419
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/6eaf85d84fbf47ea0619d0dba8d366f4e3ff0be6
diff --git a/test/core/security/corpus/alts_credentials_corpus/6f751cc09af8113f6ecd491b1830bd8454c4738d b/test/core/security/corpus/alts_credentials_corpus/6f751cc09af8113f6ecd491b1830bd8454c4738d
new file mode 100644
index 0000000000..a51a3d0f6c
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/6f751cc09af8113f6ecd491b1830bd8454c4738d
diff --git a/test/core/security/corpus/alts_credentials_corpus/70d9eb29a70d483d07e2faca6b00098af78d1fff b/test/core/security/corpus/alts_credentials_corpus/70d9eb29a70d483d07e2faca6b00098af78d1fff
new file mode 100644
index 0000000000..e9fb9b9317
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/70d9eb29a70d483d07e2faca6b00098af78d1fff
diff --git a/test/core/security/corpus/alts_credentials_corpus/7192effa1058382b379fb7b87f1acad5ac554d05 b/test/core/security/corpus/alts_credentials_corpus/7192effa1058382b379fb7b87f1acad5ac554d05
new file mode 100644
index 0000000000..23a3819ebe
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/7192effa1058382b379fb7b87f1acad5ac554d05
diff --git a/test/core/security/corpus/alts_credentials_corpus/730e85d6a62e70cb6721009b903782ade4ff73a2 b/test/core/security/corpus/alts_credentials_corpus/730e85d6a62e70cb6721009b903782ade4ff73a2
new file mode 100644
index 0000000000..9c1e71c549
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/730e85d6a62e70cb6721009b903782ade4ff73a2
diff --git a/test/core/security/corpus/alts_credentials_corpus/74002471a854059cb29de7cad8f9fb7adc3c5ec2 b/test/core/security/corpus/alts_credentials_corpus/74002471a854059cb29de7cad8f9fb7adc3c5ec2
new file mode 100644
index 0000000000..bb832313c7
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/74002471a854059cb29de7cad8f9fb7adc3c5ec2
@@ -0,0 +1,2 @@
+
+��
+\ No newline at end of file
diff --git a/test/core/security/corpus/alts_credentials_corpus/747f2330cd1fc4a06d54b376a9a6528d0364f0ac b/test/core/security/corpus/alts_credentials_corpus/747f2330cd1fc4a06d54b376a9a6528d0364f0ac
new file mode 100644
index 0000000000..332ac4b672
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/747f2330cd1fc4a06d54b376a9a6528d0364f0ac
diff --git a/test/core/security/corpus/alts_credentials_corpus/749d5d7a9e0b1545b297117e834462af32b3e230 b/test/core/security/corpus/alts_credentials_corpus/749d5d7a9e0b1545b297117e834462af32b3e230
new file mode 100644
index 0000000000..a00db592b0
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/749d5d7a9e0b1545b297117e834462af32b3e230
@@ -0,0 +1 @@
+a���+
+\ No newline at end of file
diff --git a/test/core/security/corpus/alts_credentials_corpus/77de0b1de120ac702ca45868b1008a48626daf12 b/test/core/security/corpus/alts_credentials_corpus/77de0b1de120ac702ca45868b1008a48626daf12
new file mode 100644
index 0000000000..352762cf75
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/77de0b1de120ac702ca45868b1008a48626daf12
@@ -0,0 +1 @@
+��^
+\ No newline at end of file
diff --git a/test/core/security/corpus/alts_credentials_corpus/792c67398bce19a4eeda32653c994436e79456e5 b/test/core/security/corpus/alts_credentials_corpus/792c67398bce19a4eeda32653c994436e79456e5
new file mode 100644
index 0000000000..08342871da
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/792c67398bce19a4eeda32653c994436e79456e5
@@ -0,0 +1 @@
+j�
+�
+\ No newline at end of file
diff --git a/test/core/security/corpus/alts_credentials_corpus/7a3022b248c8960289e4c80c7cc8df409499e5da b/test/core/security/corpus/alts_credentials_corpus/7a3022b248c8960289e4c80c7cc8df409499e5da
new file mode 100644
index 0000000000..f9ef6a4631
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/7a3022b248c8960289e4c80c7cc8df409499e5da
diff --git a/test/core/security/corpus/alts_credentials_corpus/7a9372081294a6fbd3fecdd91b99589c98d4948e b/test/core/security/corpus/alts_credentials_corpus/7a9372081294a6fbd3fecdd91b99589c98d4948e
new file mode 100644
index 0000000000..7100f32821
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/7a9372081294a6fbd3fecdd91b99589c98d4948e
diff --git a/test/core/security/corpus/alts_credentials_corpus/7bbe4ba828947550f4ad089d5989cb695ecbdb1b b/test/core/security/corpus/alts_credentials_corpus/7bbe4ba828947550f4ad089d5989cb695ecbdb1b
new file mode 100644
index 0000000000..44e3963031
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/7bbe4ba828947550f4ad089d5989cb695ecbdb1b
diff --git a/test/core/security/corpus/alts_credentials_corpus/7f1ad514a96f0c3d5ca5d6f7880b929a65eeae96 b/test/core/security/corpus/alts_credentials_corpus/7f1ad514a96f0c3d5ca5d6f7880b929a65eeae96
new file mode 100644
index 0000000000..700c079449
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/7f1ad514a96f0c3d5ca5d6f7880b929a65eeae96
diff --git a/test/core/security/corpus/alts_credentials_corpus/7f2b075f0b6707c38db851747e2578343eeab286 b/test/core/security/corpus/alts_credentials_corpus/7f2b075f0b6707c38db851747e2578343eeab286
new file mode 100644
index 0000000000..1f7b5d72ac
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/7f2b075f0b6707c38db851747e2578343eeab286
diff --git a/test/core/security/corpus/alts_credentials_corpus/81ebc64bfde3fad37af5a58ef7f1c5c3c54c4b5d b/test/core/security/corpus/alts_credentials_corpus/81ebc64bfde3fad37af5a58ef7f1c5c3c54c4b5d
new file mode 100644
index 0000000000..d89f30fd4c
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/81ebc64bfde3fad37af5a58ef7f1c5c3c54c4b5d
diff --git a/test/core/security/corpus/alts_credentials_corpus/82fae081afaea13831404024d39658344d56e1c6 b/test/core/security/corpus/alts_credentials_corpus/82fae081afaea13831404024d39658344d56e1c6
new file mode 100644
index 0000000000..bc3cfc241f
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/82fae081afaea13831404024d39658344d56e1c6
diff --git a/test/core/security/corpus/alts_credentials_corpus/83ba41cea1adab707f7f213af5e2ed734bdddc25 b/test/core/security/corpus/alts_credentials_corpus/83ba41cea1adab707f7f213af5e2ed734bdddc25
new file mode 100644
index 0000000000..d465fb4977
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/83ba41cea1adab707f7f213af5e2ed734bdddc25
diff --git a/test/core/security/corpus/alts_credentials_corpus/841a3f66c94e5acd836a44cd5a8514d4ad45d83e b/test/core/security/corpus/alts_credentials_corpus/841a3f66c94e5acd836a44cd5a8514d4ad45d83e
new file mode 100644
index 0000000000..cbb7bdcaf8
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/841a3f66c94e5acd836a44cd5a8514d4ad45d83e
diff --git a/test/core/security/corpus/alts_credentials_corpus/841ef94ee0f1b0b45983d95b75aba25421d73f2c b/test/core/security/corpus/alts_credentials_corpus/841ef94ee0f1b0b45983d95b75aba25421d73f2c
new file mode 100644
index 0000000000..ba85d1d67e
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/841ef94ee0f1b0b45983d95b75aba25421d73f2c
diff --git a/test/core/security/corpus/alts_credentials_corpus/843b0aad4a9707c5dcc92d12d876b78675cfcb65 b/test/core/security/corpus/alts_credentials_corpus/843b0aad4a9707c5dcc92d12d876b78675cfcb65
new file mode 100644
index 0000000000..02d61c52aa
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/843b0aad4a9707c5dcc92d12d876b78675cfcb65
diff --git a/test/core/security/corpus/alts_credentials_corpus/8483e3d92eda8df504b1d1d0d012f4bcd778cd33 b/test/core/security/corpus/alts_credentials_corpus/8483e3d92eda8df504b1d1d0d012f4bcd778cd33
new file mode 100644
index 0000000000..3795466779
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/8483e3d92eda8df504b1d1d0d012f4bcd778cd33
diff --git a/test/core/security/corpus/alts_credentials_corpus/876830fdff4e59038fa2173b700faef5bffe61de b/test/core/security/corpus/alts_credentials_corpus/876830fdff4e59038fa2173b700faef5bffe61de
new file mode 100644
index 0000000000..26048bd593
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/876830fdff4e59038fa2173b700faef5bffe61de
@@ -0,0 +1 @@
+��A
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diff --git a/test/core/security/corpus/alts_credentials_corpus/87ca3342fdce0c1f678a3f1b62428032ef51442d b/test/core/security/corpus/alts_credentials_corpus/87ca3342fdce0c1f678a3f1b62428032ef51442d
new file mode 100644
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--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/87ca3342fdce0c1f678a3f1b62428032ef51442d
diff --git a/test/core/security/corpus/alts_credentials_corpus/87d044027cdb7d35fadb56532f497764246946a6 b/test/core/security/corpus/alts_credentials_corpus/87d044027cdb7d35fadb56532f497764246946a6
new file mode 100644
index 0000000000..1e474c9134
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/87d044027cdb7d35fadb56532f497764246946a6
diff --git a/test/core/security/corpus/alts_credentials_corpus/88ce75ba18bdb7e93a81197d850f4e792f6a8155 b/test/core/security/corpus/alts_credentials_corpus/88ce75ba18bdb7e93a81197d850f4e792f6a8155
new file mode 100644
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--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/88ce75ba18bdb7e93a81197d850f4e792f6a8155
diff --git a/test/core/security/corpus/alts_credentials_corpus/89dc55e8e20e811e78c952c8bd2c16f55fe72f57 b/test/core/security/corpus/alts_credentials_corpus/89dc55e8e20e811e78c952c8bd2c16f55fe72f57
new file mode 100644
index 0000000000..00961fdf9e
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/89dc55e8e20e811e78c952c8bd2c16f55fe72f57
@@ -0,0 +1 @@
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+\ No newline at end of file
diff --git a/test/core/security/corpus/alts_credentials_corpus/8a215a58908f44bdced595ceb01a81977f1d72f0 b/test/core/security/corpus/alts_credentials_corpus/8a215a58908f44bdced595ceb01a81977f1d72f0
new file mode 100644
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--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/8a215a58908f44bdced595ceb01a81977f1d72f0
@@ -0,0 +1 @@
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+\ No newline at end of file
diff --git a/test/core/security/corpus/alts_credentials_corpus/8ac7459e918304ca40b1cf29a3ac0f555eada678 b/test/core/security/corpus/alts_credentials_corpus/8ac7459e918304ca40b1cf29a3ac0f555eada678
new file mode 100644
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--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/8ac7459e918304ca40b1cf29a3ac0f555eada678
diff --git a/test/core/security/corpus/alts_credentials_corpus/8b93e50a911f3ea0e0b0377ba4636574f2ee9a5e b/test/core/security/corpus/alts_credentials_corpus/8b93e50a911f3ea0e0b0377ba4636574f2ee9a5e
new file mode 100644
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--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/8b93e50a911f3ea0e0b0377ba4636574f2ee9a5e
diff --git a/test/core/security/corpus/alts_credentials_corpus/8c9ec0ffd803505772693833d56e7a02110645b3 b/test/core/security/corpus/alts_credentials_corpus/8c9ec0ffd803505772693833d56e7a02110645b3
new file mode 100644
index 0000000000..3bd046b7f9
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/8c9ec0ffd803505772693833d56e7a02110645b3
@@ -0,0 +1 @@
+K]//(
+\ No newline at end of file
diff --git a/test/core/security/corpus/alts_credentials_corpus/8e4b361a530dc6825afcfb4106bd482c3fd010fa b/test/core/security/corpus/alts_credentials_corpus/8e4b361a530dc6825afcfb4106bd482c3fd010fa
new file mode 100644
index 0000000000..3733df9e3c
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/8e4b361a530dc6825afcfb4106bd482c3fd010fa
@@ -0,0 +1 @@
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diff --git a/test/core/security/corpus/alts_credentials_corpus/8f6690d97bcda890f2a5b2930a2b7a4d7b56c6e7 b/test/core/security/corpus/alts_credentials_corpus/8f6690d97bcda890f2a5b2930a2b7a4d7b56c6e7
new file mode 100644
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+++ b/test/core/security/corpus/alts_credentials_corpus/8f6690d97bcda890f2a5b2930a2b7a4d7b56c6e7
@@ -0,0 +1 @@
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diff --git a/test/core/security/corpus/alts_credentials_corpus/917636de2c14dce2580d4308249a94d61d62c305 b/test/core/security/corpus/alts_credentials_corpus/917636de2c14dce2580d4308249a94d61d62c305
new file mode 100644
index 0000000000..cccb20d847
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diff --git a/test/core/security/corpus/alts_credentials_corpus/91f11008defda918951bda868cc68c6373fb0e6a b/test/core/security/corpus/alts_credentials_corpus/91f11008defda918951bda868cc68c6373fb0e6a
new file mode 100644
index 0000000000..bf10853bfb
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diff --git a/test/core/security/corpus/alts_credentials_corpus/92e01a34047b660a798086d55a3d8d7100a01939 b/test/core/security/corpus/alts_credentials_corpus/92e01a34047b660a798086d55a3d8d7100a01939
new file mode 100644
index 0000000000..e86bc1d589
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diff --git a/test/core/security/corpus/alts_credentials_corpus/963fafadb4de09dee0e6a852bd61b1740039a465 b/test/core/security/corpus/alts_credentials_corpus/963fafadb4de09dee0e6a852bd61b1740039a465
new file mode 100644
index 0000000000..8933b18c72
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@@ -0,0 +1 @@
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diff --git a/test/core/security/corpus/alts_credentials_corpus/97bf33ec97b93fcc2449431915911a55b906e3b6 b/test/core/security/corpus/alts_credentials_corpus/97bf33ec97b93fcc2449431915911a55b906e3b6
new file mode 100644
index 0000000000..8101e3720d
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@@ -0,0 +1 @@
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diff --git a/test/core/security/corpus/alts_credentials_corpus/99e31e12b02b02479d10b2c08426906bd93a0840 b/test/core/security/corpus/alts_credentials_corpus/99e31e12b02b02479d10b2c08426906bd93a0840
new file mode 100644
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diff --git a/test/core/security/corpus/alts_credentials_corpus/9a75ce693e7259d4d3bb9203dfc0a65f8bbaa466 b/test/core/security/corpus/alts_credentials_corpus/9a75ce693e7259d4d3bb9203dfc0a65f8bbaa466
new file mode 100644
index 0000000000..5366cdd4a6
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diff --git a/test/core/security/corpus/alts_credentials_corpus/9ac0d956f9743e026baad7319ba2a75d9f1a534f b/test/core/security/corpus/alts_credentials_corpus/9ac0d956f9743e026baad7319ba2a75d9f1a534f
new file mode 100644
index 0000000000..adb0583eb6
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diff --git a/test/core/security/corpus/alts_credentials_corpus/9ae56d4451dd3e1b66ddc250d84dbf6d8cae0dbd b/test/core/security/corpus/alts_credentials_corpus/9ae56d4451dd3e1b66ddc250d84dbf6d8cae0dbd
new file mode 100644
index 0000000000..121d0cb5d6
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diff --git a/test/core/security/corpus/alts_credentials_corpus/9b9a3a1e4023c9b172060249752a482a3437ef2a b/test/core/security/corpus/alts_credentials_corpus/9b9a3a1e4023c9b172060249752a482a3437ef2a
new file mode 100644
index 0000000000..0b19f19a43
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/9b9a3a1e4023c9b172060249752a482a3437ef2a
diff --git a/test/core/security/corpus/alts_credentials_corpus/9c81164e10bf612c352dca3ecabf57743b451d42 b/test/core/security/corpus/alts_credentials_corpus/9c81164e10bf612c352dca3ecabf57743b451d42
new file mode 100644
index 0000000000..1cae116cff
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/9c81164e10bf612c352dca3ecabf57743b451d42
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diff --git a/test/core/security/corpus/alts_credentials_corpus/9d8b420b5d32deb0140ab91eeebba58ca6163722 b/test/core/security/corpus/alts_credentials_corpus/9d8b420b5d32deb0140ab91eeebba58ca6163722
new file mode 100644
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diff --git a/test/core/security/corpus/alts_credentials_corpus/9de687bf1e2cfac54c3b2e2eb85b53014a460ff7 b/test/core/security/corpus/alts_credentials_corpus/9de687bf1e2cfac54c3b2e2eb85b53014a460ff7
new file mode 100644
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diff --git a/test/core/security/corpus/alts_credentials_corpus/9f3cda19a186bd11bfac361b464f92daa129a33b b/test/core/security/corpus/alts_credentials_corpus/9f3cda19a186bd11bfac361b464f92daa129a33b
new file mode 100644
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diff --git a/test/core/security/corpus/alts_credentials_corpus/a14fc6a608121f8abf0fe25cf466720f00f25653 b/test/core/security/corpus/alts_credentials_corpus/a14fc6a608121f8abf0fe25cf466720f00f25653
new file mode 100644
index 0000000000..58af76210a
--- /dev/null
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diff --git a/test/core/security/corpus/alts_credentials_corpus/a39906074669a6b76a35b0adf2bf36ad751f3b35 b/test/core/security/corpus/alts_credentials_corpus/a39906074669a6b76a35b0adf2bf36ad751f3b35
new file mode 100644
index 0000000000..e10cdb997e
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diff --git a/test/core/security/corpus/alts_credentials_corpus/a454ca483b4a66b83826d061be2859dd79ff0d6c b/test/core/security/corpus/alts_credentials_corpus/a454ca483b4a66b83826d061be2859dd79ff0d6c
new file mode 100644
index 0000000000..38424fc7a2
--- /dev/null
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diff --git a/test/core/security/corpus/alts_credentials_corpus/a52df5607370ff0f56d821000f3d5e386a01d489 b/test/core/security/corpus/alts_credentials_corpus/a52df5607370ff0f56d821000f3d5e386a01d489
new file mode 100644
index 0000000000..f16da079ed
--- /dev/null
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diff --git a/test/core/security/corpus/alts_credentials_corpus/a56eaf47f7c7263e53efdc55ec39063dbb4ae71c b/test/core/security/corpus/alts_credentials_corpus/a56eaf47f7c7263e53efdc55ec39063dbb4ae71c
new file mode 100644
index 0000000000..3664ce0f99
--- /dev/null
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diff --git a/test/core/security/corpus/alts_credentials_corpus/a79249fb8f7d53f0a280359d2d9df31594adbdfc b/test/core/security/corpus/alts_credentials_corpus/a79249fb8f7d53f0a280359d2d9df31594adbdfc
new file mode 100644
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diff --git a/test/core/security/corpus/alts_credentials_corpus/aa98a46f25004f7436aadb36ff8b7f07ed7bfce1 b/test/core/security/corpus/alts_credentials_corpus/aa98a46f25004f7436aadb36ff8b7f07ed7bfce1
new file mode 100644
index 0000000000..f1db8d9f2c
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/aa98a46f25004f7436aadb36ff8b7f07ed7bfce1
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diff --git a/test/core/security/corpus/alts_credentials_corpus/adc83b19e793491b1c6ea0fd8b46cd9f32e592fc b/test/core/security/corpus/alts_credentials_corpus/adc83b19e793491b1c6ea0fd8b46cd9f32e592fc
new file mode 100644
index 0000000000..8b13789179
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@@ -0,0 +1 @@
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diff --git a/test/core/security/corpus/alts_credentials_corpus/afd8e19f7bfd6c963f1856be59b75627864821dc b/test/core/security/corpus/alts_credentials_corpus/afd8e19f7bfd6c963f1856be59b75627864821dc
new file mode 100644
index 0000000000..385405e116
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/afd8e19f7bfd6c963f1856be59b75627864821dc
@@ -0,0 +1,2 @@
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new file mode 100644
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diff --git a/test/core/security/corpus/alts_credentials_corpus/b430d41ef65493b3e917182c23ce90df983e01ab b/test/core/security/corpus/alts_credentials_corpus/b430d41ef65493b3e917182c23ce90df983e01ab
new file mode 100644
index 0000000000..cbb8cebbb9
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@@ -0,0 +1,2 @@
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diff --git a/test/core/security/corpus/alts_credentials_corpus/b44e715e0cfe05f0c92a9e000ac3c36aae17df9d b/test/core/security/corpus/alts_credentials_corpus/b44e715e0cfe05f0c92a9e000ac3c36aae17df9d
new file mode 100644
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new file mode 100644
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--- /dev/null
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diff --git a/test/core/security/corpus/alts_credentials_corpus/b53d84468ea93620a9824ca65acf1179f431e763 b/test/core/security/corpus/alts_credentials_corpus/b53d84468ea93620a9824ca65acf1179f431e763
new file mode 100644
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new file mode 100644
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diff --git a/test/core/security/corpus/alts_credentials_corpus/b7f4a484866a8050dbc63bc905c9803c6964eda5 b/test/core/security/corpus/alts_credentials_corpus/b7f4a484866a8050dbc63bc905c9803c6964eda5
new file mode 100644
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diff --git a/test/core/security/corpus/alts_credentials_corpus/b8f21e59f90431c982d5ec3fb54ae4605f102252 b/test/core/security/corpus/alts_credentials_corpus/b8f21e59f90431c982d5ec3fb54ae4605f102252
new file mode 100644
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new file mode 100644
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--- /dev/null
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diff --git a/test/core/security/corpus/alts_credentials_corpus/bb01bed86b43257be9f527388e1183f52438c473 b/test/core/security/corpus/alts_credentials_corpus/bb01bed86b43257be9f527388e1183f52438c473
new file mode 100644
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--- /dev/null
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new file mode 100644
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new file mode 100644
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diff --git a/test/core/security/corpus/alts_credentials_corpus/bf8b4530d8d246dd74ac53a13471bba17941dff7 b/test/core/security/corpus/alts_credentials_corpus/bf8b4530d8d246dd74ac53a13471bba17941dff7
new file mode 100644
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@@ -0,0 +1 @@
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new file mode 100644
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new file mode 100644
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--- /dev/null
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diff --git a/test/core/security/corpus/alts_credentials_corpus/c281efe9620da999a637ff6e9b3279ec613fb992 b/test/core/security/corpus/alts_credentials_corpus/c281efe9620da999a637ff6e9b3279ec613fb992
new file mode 100644
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--- /dev/null
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diff --git a/test/core/security/corpus/alts_credentials_corpus/c30a212824ee71e215f475f453de17c65a200101 b/test/core/security/corpus/alts_credentials_corpus/c30a212824ee71e215f475f453de17c65a200101
new file mode 100644
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--- /dev/null
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new file mode 100644
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@@ -0,0 +1 @@
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new file mode 100644
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new file mode 100644
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new file mode 100644
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diff --git a/test/core/security/corpus/alts_credentials_corpus/c739e7b5ad999edbdeffdab672dbc30deb3959a0 b/test/core/security/corpus/alts_credentials_corpus/c739e7b5ad999edbdeffdab672dbc30deb3959a0
new file mode 100644
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diff --git a/test/core/security/corpus/alts_credentials_corpus/c7d73b12a7108d82f8dac6d8a6a34f838601aca6 b/test/core/security/corpus/alts_credentials_corpus/c7d73b12a7108d82f8dac6d8a6a34f838601aca6
new file mode 100644
index 0000000000..b38437a65e
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/c7d73b12a7108d82f8dac6d8a6a34f838601aca6
diff --git a/test/core/security/corpus/alts_credentials_corpus/ca781e1add632433293e847ae9e71649c217ee5f b/test/core/security/corpus/alts_credentials_corpus/ca781e1add632433293e847ae9e71649c217ee5f
new file mode 100644
index 0000000000..5c79dd1c52
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/ca781e1add632433293e847ae9e71649c217ee5f
diff --git a/test/core/security/corpus/alts_credentials_corpus/cc48e916f40e8d69c2d07cfda42c7d3b7fe3447a b/test/core/security/corpus/alts_credentials_corpus/cc48e916f40e8d69c2d07cfda42c7d3b7fe3447a
new file mode 100644
index 0000000000..11ccb07de1
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/cc48e916f40e8d69c2d07cfda42c7d3b7fe3447a
diff --git a/test/core/security/corpus/alts_credentials_corpus/cca1aff4c08ee4ccbcb6f80e1cd1480a0a093cfd b/test/core/security/corpus/alts_credentials_corpus/cca1aff4c08ee4ccbcb6f80e1cd1480a0a093cfd
new file mode 100644
index 0000000000..b7bebbe8e9
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/cca1aff4c08ee4ccbcb6f80e1cd1480a0a093cfd
diff --git a/test/core/security/corpus/alts_credentials_corpus/cf6ae8bf1d08d25e235b7bee0839984bbc04edf6 b/test/core/security/corpus/alts_credentials_corpus/cf6ae8bf1d08d25e235b7bee0839984bbc04edf6
new file mode 100644
index 0000000000..32eb656fbf
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/cf6ae8bf1d08d25e235b7bee0839984bbc04edf6
diff --git a/test/core/security/corpus/alts_credentials_corpus/cfc52fa086292c699efd7bf41d2fae3deb449536 b/test/core/security/corpus/alts_credentials_corpus/cfc52fa086292c699efd7bf41d2fae3deb449536
new file mode 100644
index 0000000000..285e35d40f
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/cfc52fa086292c699efd7bf41d2fae3deb449536
diff --git a/test/core/security/corpus/alts_credentials_corpus/cfe13ef3c6c713a059f231f0001ecec97e2a932d b/test/core/security/corpus/alts_credentials_corpus/cfe13ef3c6c713a059f231f0001ecec97e2a932d
new file mode 100644
index 0000000000..1059f60cec
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/cfe13ef3c6c713a059f231f0001ecec97e2a932d
diff --git a/test/core/security/corpus/alts_credentials_corpus/d14026ac6421bca7161024f4e735cb80a1068d01 b/test/core/security/corpus/alts_credentials_corpus/d14026ac6421bca7161024f4e735cb80a1068d01
new file mode 100644
index 0000000000..68b7682c71
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/d14026ac6421bca7161024f4e735cb80a1068d01
@@ -0,0 +1,2 @@
+
+������������������+����
+\ No newline at end of file
diff --git a/test/core/security/corpus/alts_credentials_corpus/d2fb6e8f7867fc1e2ebe723da2b5246dc9cc6b14 b/test/core/security/corpus/alts_credentials_corpus/d2fb6e8f7867fc1e2ebe723da2b5246dc9cc6b14
new file mode 100644
index 0000000000..9854260459
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/d2fb6e8f7867fc1e2ebe723da2b5246dc9cc6b14
diff --git a/test/core/security/corpus/alts_credentials_corpus/d4db7d51bdaa4781cf12c3b59914bad414d2a41e b/test/core/security/corpus/alts_credentials_corpus/d4db7d51bdaa4781cf12c3b59914bad414d2a41e
new file mode 100644
index 0000000000..0979d45bca
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/d4db7d51bdaa4781cf12c3b59914bad414d2a41e
diff --git a/test/core/security/corpus/alts_credentials_corpus/d533da0e7f8c1e39bb025b4d7a89613142a6f54e b/test/core/security/corpus/alts_credentials_corpus/d533da0e7f8c1e39bb025b4d7a89613142a6f54e
new file mode 100644
index 0000000000..89ef0d2307
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/d533da0e7f8c1e39bb025b4d7a89613142a6f54e
diff --git a/test/core/security/corpus/alts_credentials_corpus/d5cf489d01a1b847a7aac5dddabff23fdc218e1e b/test/core/security/corpus/alts_credentials_corpus/d5cf489d01a1b847a7aac5dddabff23fdc218e1e
new file mode 100644
index 0000000000..c544b2793e
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/d5cf489d01a1b847a7aac5dddabff23fdc218e1e
diff --git a/test/core/security/corpus/alts_credentials_corpus/d686f8561a249c7c15c78f76a5fceb884286e070 b/test/core/security/corpus/alts_credentials_corpus/d686f8561a249c7c15c78f76a5fceb884286e070
new file mode 100644
index 0000000000..b96c459973
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/d686f8561a249c7c15c78f76a5fceb884286e070
diff --git a/test/core/security/corpus/alts_credentials_corpus/d92424daad9d96a40e5ab177e3824c36ef51dc0f b/test/core/security/corpus/alts_credentials_corpus/d92424daad9d96a40e5ab177e3824c36ef51dc0f
new file mode 100644
index 0000000000..509eb39065
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/d92424daad9d96a40e5ab177e3824c36ef51dc0f
diff --git a/test/core/security/corpus/alts_credentials_corpus/db242a11ed88b2b26af46770dd1927d9f35301fb b/test/core/security/corpus/alts_credentials_corpus/db242a11ed88b2b26af46770dd1927d9f35301fb
new file mode 100644
index 0000000000..bd5d04676a
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/db242a11ed88b2b26af46770dd1927d9f35301fb
diff --git a/test/core/security/corpus/alts_credentials_corpus/db32eb04db13d58f65f46d262608bd088987c063 b/test/core/security/corpus/alts_credentials_corpus/db32eb04db13d58f65f46d262608bd088987c063
new file mode 100644
index 0000000000..5c526d8a28
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/db32eb04db13d58f65f46d262608bd088987c063
diff --git a/test/core/security/corpus/alts_credentials_corpus/db39a953317951759e40734de6607a0b4457728e b/test/core/security/corpus/alts_credentials_corpus/db39a953317951759e40734de6607a0b4457728e
new file mode 100644
index 0000000000..d794576b59
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/db39a953317951759e40734de6607a0b4457728e
diff --git a/test/core/security/corpus/alts_credentials_corpus/dc5e8f3102456bed90d17303bc4cff1a7e076d5d b/test/core/security/corpus/alts_credentials_corpus/dc5e8f3102456bed90d17303bc4cff1a7e076d5d
new file mode 100644
index 0000000000..53e1bbce92
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/dc5e8f3102456bed90d17303bc4cff1a7e076d5d
@@ -0,0 +1 @@
+�
+\ No newline at end of file
diff --git a/test/core/security/corpus/alts_credentials_corpus/dd9542bbed8e5dc58da2789edbfb9c38d578d3b4 b/test/core/security/corpus/alts_credentials_corpus/dd9542bbed8e5dc58da2789edbfb9c38d578d3b4
new file mode 100644
index 0000000000..95fd950be8
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/dd9542bbed8e5dc58da2789edbfb9c38d578d3b4
diff --git a/test/core/security/corpus/alts_credentials_corpus/de2ebb1ed324385de500a1a3308846239857c3c7 b/test/core/security/corpus/alts_credentials_corpus/de2ebb1ed324385de500a1a3308846239857c3c7
new file mode 100644
index 0000000000..d0cee5f847
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/de2ebb1ed324385de500a1a3308846239857c3c7
@@ -0,0 +1 @@
+�+�
+\ No newline at end of file
diff --git a/test/core/security/corpus/alts_credentials_corpus/de8ba9158254c1cd84b53df1e4cdf1757b1392f1 b/test/core/security/corpus/alts_credentials_corpus/de8ba9158254c1cd84b53df1e4cdf1757b1392f1
new file mode 100644
index 0000000000..1cbbe5b8cb
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/de8ba9158254c1cd84b53df1e4cdf1757b1392f1
diff --git a/test/core/security/corpus/alts_credentials_corpus/e1dd260746f50024822a8b729b89545d26decfb8 b/test/core/security/corpus/alts_credentials_corpus/e1dd260746f50024822a8b729b89545d26decfb8
new file mode 100644
index 0000000000..c44854edf7
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/e1dd260746f50024822a8b729b89545d26decfb8
diff --git a/test/core/security/corpus/alts_credentials_corpus/e29add81b20dc570fdc885782689f6dccb1c5fad b/test/core/security/corpus/alts_credentials_corpus/e29add81b20dc570fdc885782689f6dccb1c5fad
new file mode 100644
index 0000000000..5c50fe7539
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/e29add81b20dc570fdc885782689f6dccb1c5fad
diff --git a/test/core/security/corpus/alts_credentials_corpus/e2e99af62843cd3b29d50daeb118e58830784da9 b/test/core/security/corpus/alts_credentials_corpus/e2e99af62843cd3b29d50daeb118e58830784da9
new file mode 100644
index 0000000000..04da1314d9
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/e2e99af62843cd3b29d50daeb118e58830784da9
diff --git a/test/core/security/corpus/alts_credentials_corpus/e46611c5daf99662e1576147c1623409752a1f39 b/test/core/security/corpus/alts_credentials_corpus/e46611c5daf99662e1576147c1623409752a1f39
new file mode 100644
index 0000000000..0334d31def
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/e46611c5daf99662e1576147c1623409752a1f39
@@ -0,0 +1 @@
+�##
+\ No newline at end of file
diff --git a/test/core/security/corpus/alts_credentials_corpus/e5a1ba11af830e9d2db201c5164f75747a85fe9b b/test/core/security/corpus/alts_credentials_corpus/e5a1ba11af830e9d2db201c5164f75747a85fe9b
new file mode 100644
index 0000000000..8e8b1e2001
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/e5a1ba11af830e9d2db201c5164f75747a85fe9b
diff --git a/test/core/security/corpus/alts_credentials_corpus/e6026ee0badf216b326443a5f708446b2f2e579f b/test/core/security/corpus/alts_credentials_corpus/e6026ee0badf216b326443a5f708446b2f2e579f
new file mode 100644
index 0000000000..a99014fa41
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/e6026ee0badf216b326443a5f708446b2f2e579f
diff --git a/test/core/security/corpus/alts_credentials_corpus/e6c7d2c0038fa1f03fc6590a726abc98f4c641f3 b/test/core/security/corpus/alts_credentials_corpus/e6c7d2c0038fa1f03fc6590a726abc98f4c641f3
new file mode 100644
index 0000000000..8f5a9f5b33
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/e6c7d2c0038fa1f03fc6590a726abc98f4c641f3
@@ -0,0 +1 @@
+�i
+\ No newline at end of file
diff --git a/test/core/security/corpus/alts_credentials_corpus/eafdef6a630bed71bd0e4f3d4a16b5fa0c920651 b/test/core/security/corpus/alts_credentials_corpus/eafdef6a630bed71bd0e4f3d4a16b5fa0c920651
new file mode 100644
index 0000000000..6fbe750e01
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/eafdef6a630bed71bd0e4f3d4a16b5fa0c920651
diff --git a/test/core/security/corpus/alts_credentials_corpus/ece985b9b82e27281514d460709d7edf8203ded7 b/test/core/security/corpus/alts_credentials_corpus/ece985b9b82e27281514d460709d7edf8203ded7
new file mode 100644
index 0000000000..c1243022a0
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/ece985b9b82e27281514d460709d7edf8203ded7
diff --git a/test/core/security/corpus/alts_credentials_corpus/edb8f4259f756c2c4bc731f05beaa36f992cf079 b/test/core/security/corpus/alts_credentials_corpus/edb8f4259f756c2c4bc731f05beaa36f992cf079
new file mode 100644
index 0000000000..1cc08a4d39
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/edb8f4259f756c2c4bc731f05beaa36f992cf079
diff --git a/test/core/security/corpus/alts_credentials_corpus/edce7778c2e1adb81dda3d057a6536759a7cb293 b/test/core/security/corpus/alts_credentials_corpus/edce7778c2e1adb81dda3d057a6536759a7cb293
new file mode 100644
index 0000000000..39b52cf971
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/edce7778c2e1adb81dda3d057a6536759a7cb293
@@ -0,0 +1 @@
++
+\ No newline at end of file
diff --git a/test/core/security/corpus/alts_credentials_corpus/ee4040c0dd406dd616c49ed2c37b40478dabfe0f b/test/core/security/corpus/alts_credentials_corpus/ee4040c0dd406dd616c49ed2c37b40478dabfe0f
new file mode 100644
index 0000000000..48325e312e
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/ee4040c0dd406dd616c49ed2c37b40478dabfe0f
diff --git a/test/core/security/corpus/alts_credentials_corpus/ee69f2b380663d051a70f30fcfce9f79f5341e5a b/test/core/security/corpus/alts_credentials_corpus/ee69f2b380663d051a70f30fcfce9f79f5341e5a
new file mode 100644
index 0000000000..7e0ad2a61a
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/ee69f2b380663d051a70f30fcfce9f79f5341e5a
diff --git a/test/core/security/corpus/alts_credentials_corpus/efc6743e47274058771bb6eda1fefa017bde4a95 b/test/core/security/corpus/alts_credentials_corpus/efc6743e47274058771bb6eda1fefa017bde4a95
new file mode 100644
index 0000000000..4418e8ab73
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/efc6743e47274058771bb6eda1fefa017bde4a95
diff --git a/test/core/security/corpus/alts_credentials_corpus/f0038e54162000694d882b1acb80930c807b41d2 b/test/core/security/corpus/alts_credentials_corpus/f0038e54162000694d882b1acb80930c807b41d2
new file mode 100644
index 0000000000..292a5e4bd3
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/f0038e54162000694d882b1acb80930c807b41d2
diff --git a/test/core/security/corpus/alts_credentials_corpus/f1deb9e388c877337dabe92f31b01e2a019a10f4 b/test/core/security/corpus/alts_credentials_corpus/f1deb9e388c877337dabe92f31b01e2a019a10f4
new file mode 100644
index 0000000000..46464ee9c2
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/f1deb9e388c877337dabe92f31b01e2a019a10f4
diff --git a/test/core/security/corpus/alts_credentials_corpus/f3a09373e4d3c7310d372089e6deb15d6b22c198 b/test/core/security/corpus/alts_credentials_corpus/f3a09373e4d3c7310d372089e6deb15d6b22c198
new file mode 100644
index 0000000000..a974996100
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/f3a09373e4d3c7310d372089e6deb15d6b22c198
@@ -0,0 +1 @@
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diff --git a/test/core/security/corpus/alts_credentials_corpus/f3db7ef6495fa1ac5bb4db293fb38dd59122bb7c b/test/core/security/corpus/alts_credentials_corpus/f3db7ef6495fa1ac5bb4db293fb38dd59122bb7c
new file mode 100644
index 0000000000..8afc32bf9d
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/f3db7ef6495fa1ac5bb4db293fb38dd59122bb7c
@@ -0,0 +1,2 @@
+[��[���	
+��
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diff --git a/test/core/security/corpus/alts_credentials_corpus/f434bb4ceecc573e085d4c3ef453ef01e93d9c89 b/test/core/security/corpus/alts_credentials_corpus/f434bb4ceecc573e085d4c3ef453ef01e93d9c89
new file mode 100644
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--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/f434bb4ceecc573e085d4c3ef453ef01e93d9c89
diff --git a/test/core/security/corpus/alts_credentials_corpus/f55bceaad42ddf9d2b37fdfca68255d29a696109 b/test/core/security/corpus/alts_credentials_corpus/f55bceaad42ddf9d2b37fdfca68255d29a696109
new file mode 100644
index 0000000000..a8eef8f96a
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/f55bceaad42ddf9d2b37fdfca68255d29a696109
@@ -0,0 +1 @@
+��
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diff --git a/test/core/security/corpus/alts_credentials_corpus/f62ca5321428a5d23f3c804fb51eb4e65bc58716 b/test/core/security/corpus/alts_credentials_corpus/f62ca5321428a5d23f3c804fb51eb4e65bc58716
new file mode 100644
index 0000000000..0d80f7be69
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/f62ca5321428a5d23f3c804fb51eb4e65bc58716
diff --git a/test/core/security/corpus/alts_credentials_corpus/f7c6a558b8d0af64db2b139371a7af7068b01b92 b/test/core/security/corpus/alts_credentials_corpus/f7c6a558b8d0af64db2b139371a7af7068b01b92
new file mode 100644
index 0000000000..d46ea45bc4
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/f7c6a558b8d0af64db2b139371a7af7068b01b92
diff --git a/test/core/security/corpus/alts_credentials_corpus/faa1781e1444bba5b8c677bc5e2a38d023a1ec65 b/test/core/security/corpus/alts_credentials_corpus/faa1781e1444bba5b8c677bc5e2a38d023a1ec65
new file mode 100644
index 0000000000..013d565bb4
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/faa1781e1444bba5b8c677bc5e2a38d023a1ec65
@@ -0,0 +1 @@
+�
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diff --git a/test/core/security/corpus/alts_credentials_corpus/fceba33ada1dda05fccedfefd331c9a201f1a2e5 b/test/core/security/corpus/alts_credentials_corpus/fceba33ada1dda05fccedfefd331c9a201f1a2e5
new file mode 100644
index 0000000000..f3db26dc2f
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/fceba33ada1dda05fccedfefd331c9a201f1a2e5
@@ -0,0 +1 @@
+�
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diff --git a/test/core/security/corpus/alts_credentials_corpus/fd668bef6fdaf7f3ffd58d8c60ce550476652e60 b/test/core/security/corpus/alts_credentials_corpus/fd668bef6fdaf7f3ffd58d8c60ce550476652e60
new file mode 100644
index 0000000000..dcefd99985
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/fd668bef6fdaf7f3ffd58d8c60ce550476652e60
diff --git a/test/core/security/corpus/alts_credentials_corpus/fdf06b928e37e7c4ae59a568b5723ad98bbed6e5 b/test/core/security/corpus/alts_credentials_corpus/fdf06b928e37e7c4ae59a568b5723ad98bbed6e5
new file mode 100644
index 0000000000..fe28d69b5f
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/fdf06b928e37e7c4ae59a568b5723ad98bbed6e5
diff --git a/test/core/security/corpus/alts_credentials_corpus/fe2fc5d499aeb2762387ef2e3ce939280813dec0 b/test/core/security/corpus/alts_credentials_corpus/fe2fc5d499aeb2762387ef2e3ce939280813dec0
new file mode 100644
index 0000000000..cb035e7101
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/fe2fc5d499aeb2762387ef2e3ce939280813dec0
diff --git a/test/core/security/corpus/alts_credentials_corpus/ff548d368b090409a138e5cc4afc7f43b4a3fbbd b/test/core/security/corpus/alts_credentials_corpus/ff548d368b090409a138e5cc4afc7f43b4a3fbbd
new file mode 100644
index 0000000000..caadbc0309
--- /dev/null
+++ b/test/core/security/corpus/alts_credentials_corpus/ff548d368b090409a138e5cc4afc7f43b4a3fbbd
diff --git a/test/core/util/BUILD b/test/core/util/BUILD
index 886cfddf86..f52570cde5 100644
--- a/test/core/util/BUILD
+++ b/test/core/util/BUILD
@@ -52,6 +52,7 @@ grpc_cc_library(
     name = "grpc_test_util_base",
     srcs = [
         "cmdline.cc",
+        "fuzzer_util.cc",
         "grpc_profiler.cc",
         "histogram.cc",
         "mock_endpoint.cc",
@@ -70,6 +71,7 @@ grpc_cc_library(
     ],
     hdrs = [
         "cmdline.h",
+        "fuzzer_util.h",
         "grpc_profiler.h",
         "histogram.h",
         "mock_endpoint.h",
diff --git a/test/core/util/fuzzer_util.cc b/test/core/util/fuzzer_util.cc
new file mode 100644
index 0000000000..29c9b8875f
--- /dev/null
+++ b/test/core/util/fuzzer_util.cc
@@ -0,0 +1,82 @@
+/*
+ *
+ * Copyright 2018 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+#include "test/core/util/fuzzer_util.h"
+
+#include <grpc/support/alloc.h>
+
+#include "src/core/lib/gpr/useful.h"
+
+namespace grpc_core {
+namespace testing {
+
+uint8_t grpc_fuzzer_get_next_byte(input_stream* inp) {
+  if (inp->cur == inp->end) {
+    return 0;
+  }
+  return *inp->cur++;
+}
+
+char* grpc_fuzzer_get_next_string(input_stream* inp, bool* special) {
+  char* str = nullptr;
+  size_t cap = 0;
+  size_t sz = 0;
+  char c;
+  do {
+    if (cap == sz) {
+      cap = GPR_MAX(3 * cap / 2, cap + 8);
+      str = static_cast<char*>(gpr_realloc(str, cap));
+    }
+    c = static_cast<char>(grpc_fuzzer_get_next_byte(inp));
+    str[sz++] = c;
+  } while (c != 0 && c != 1);
+  if (special != nullptr) {
+    *special = (c == 1);
+  }
+  if (c == 1) {
+    str[sz - 1] = 0;
+  }
+  return str;
+}
+
+uint32_t grpc_fuzzer_get_next_uint32(input_stream* inp) {
+  uint8_t b = grpc_fuzzer_get_next_byte(inp);
+  uint32_t x = b & 0x7f;
+  if (b & 0x80) {
+    x <<= 7;
+    b = grpc_fuzzer_get_next_byte(inp);
+    x |= b & 0x7f;
+    if (b & 0x80) {
+      x <<= 7;
+      b = grpc_fuzzer_get_next_byte(inp);
+      x |= b & 0x7f;
+      if (b & 0x80) {
+        x <<= 7;
+        b = grpc_fuzzer_get_next_byte(inp);
+        x |= b & 0x7f;
+        if (b & 0x80) {
+          x = (x << 4) | (grpc_fuzzer_get_next_byte(inp) & 0x0f);
+        }
+      }
+    }
+  }
+  return x;
+}
+
+}  // namespace testing
+}  // namespace grpc_core
diff --git a/test/core/util/fuzzer_util.h b/test/core/util/fuzzer_util.h
new file mode 100644
index 0000000000..0e938399a1
--- /dev/null
+++ b/test/core/util/fuzzer_util.h
@@ -0,0 +1,49 @@
+/*
+ *
+ * Copyright 2018 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+#ifndef GRPC_TEST_CORE_UTIL_FUZZER_UTIL_H
+#define GRPC_TEST_CORE_UTIL_FUZZER_UTIL_H
+
+#include <stdint.h>
+
+namespace grpc_core {
+
+namespace testing {
+
+// Main struct for input_stream. It allows easy access to input
+// bytes, and allows reading a little past the end(avoiding
+// needing to check everywhere).
+typedef struct {
+  const uint8_t* cur;
+  const uint8_t* end;
+} input_stream;
+
+// get a byte from an input stream.
+uint8_t grpc_fuzzer_get_next_byte(input_stream* inp);
+
+// get a string and boolean values (if special is not null) from an input
+// stream.
+char* grpc_fuzzer_get_next_string(input_stream* inp, bool* special);
+
+// get a uint32 value from an input stream.
+uint32_t grpc_fuzzer_get_next_uint32(input_stream* inp);
+
+}  // namespace testing
+}  // namespace grpc_core
+
+#endif /* GRPC_TEST_CORE_UTIL_FUZZER_UTIL_H */
diff --git a/tools/fuzzer/runners/alts_credentials_fuzzer.sh b/tools/fuzzer/runners/alts_credentials_fuzzer.sh
new file mode 100644
index 0000000000..3aaff6b57d
--- /dev/null
+++ b/tools/fuzzer/runners/alts_credentials_fuzzer.sh
@@ -0,0 +1,30 @@
+#!/bin/bash
+# Copyright 2016 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+flags="-max_total_time=$runtime -artifact_prefix=fuzzer_output/ -max_len=2048 -timeout=120"
+
+
+if [ "$jobs" != "1" ]
+then
+  flags="-jobs=$jobs -workers=$jobs $flags"
+fi
+
+if [ "$config" == "asan-trace-cmp" ]
+then
+  flags="-use_traces=1 $flags"
+fi
+
+bins/$config/alts_credentials_fuzzer $flags fuzzer_output test/core/security/corpus/alts_credentials_corpus
diff --git a/tools/run_tests/generated/sources_and_headers.json b/tools/run_tests/generated/sources_and_headers.json
index abb7005327..9c5d1ec81b 100644
--- a/tools/run_tests/generated/sources_and_headers.json
+++ b/tools/run_tests/generated/sources_and_headers.json
@@ -60,6 +60,23 @@
     "headers": [], 
     "is_filegroup": false, 
     "language": "c", 
+    "name": "alts_credentials_fuzzer", 
+    "src": [
+      "test/core/security/alts_credentials_fuzzer.cc"
+    ], 
+    "third_party": false, 
+    "type": "target"
+  }, 
+  {
+    "deps": [
+      "gpr", 
+      "gpr_test_util", 
+      "grpc", 
+      "grpc_test_util"
+    ], 
+    "headers": [], 
+    "is_filegroup": false, 
+    "language": "c", 
     "name": "api_fuzzer", 
     "src": [
       "test/core/end2end/fuzzers/api_fuzzer.cc"
@@ -6459,6 +6476,24 @@
     "headers": [], 
     "is_filegroup": false, 
     "language": "c", 
+    "name": "alts_credentials_fuzzer_one_entry", 
+    "src": [
+      "test/core/security/alts_credentials_fuzzer.cc", 
+      "test/core/util/one_corpus_entry_fuzzer.cc"
+    ], 
+    "third_party": false, 
+    "type": "target"
+  }, 
+  {
+    "deps": [
+      "gpr", 
+      "gpr_test_util", 
+      "grpc", 
+      "grpc_test_util"
+    ], 
+    "headers": [], 
+    "is_filegroup": false, 
+    "language": "c", 
     "name": "api_fuzzer_one_entry", 
     "src": [
       "test/core/end2end/fuzzers/api_fuzzer.cc", 
@@ -10165,6 +10200,7 @@
       "test/core/end2end/fixtures/proxy.h", 
       "test/core/iomgr/endpoint_tests.h", 
       "test/core/util/debugger_macros.h", 
+      "test/core/util/fuzzer_util.h", 
       "test/core/util/grpc_profiler.h", 
       "test/core/util/histogram.h", 
       "test/core/util/memory_counters.h", 
@@ -10194,6 +10230,8 @@
       "test/core/iomgr/endpoint_tests.h", 
       "test/core/util/debugger_macros.cc", 
       "test/core/util/debugger_macros.h", 
+      "test/core/util/fuzzer_util.cc", 
+      "test/core/util/fuzzer_util.h", 
       "test/core/util/grpc_profiler.cc", 
       "test/core/util/grpc_profiler.h", 
       "test/core/util/histogram.cc", 
diff --git a/tools/run_tests/generated/tests.json b/tools/run_tests/generated/tests.json
index e2a79075d9..1a5506f4f0 100644
--- a/tools/run_tests/generated/tests.json
+++ b/tools/run_tests/generated/tests.json
@@ -63845,6 +63845,4192 @@
   }, 
   {
     "args": [
+      "test/core/security/corpus/alts_credentials_corpus/001b0f1c1fd877209ec330f91ffe9450803f3af1"
+    ], 
+    "ci_platforms": [
+      "linux"
+    ], 
+    "cpu_cost": 0.1, 
+    "exclude_configs": [
+      "tsan"
+    ], 
+    "exclude_iomgrs": [
+      "uv"
+    ], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "alts_credentials_fuzzer_one_entry", 
+    "platforms": [
+      "mac", 
+      "linux"
+    ], 
+    "uses_polling": false
+  }, 
+  {
+    "args": [
+      "test/core/security/corpus/alts_credentials_corpus/01a3e90d943f0e4b0b8ec6e21f22a7805a3d55ae"
+    ], 
+    "ci_platforms": [
+      "linux"
+    ], 
+    "cpu_cost": 0.1, 
+    "exclude_configs": [
+      "tsan"
+    ], 
+    "exclude_iomgrs": [
+      "uv"
+    ], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "alts_credentials_fuzzer_one_entry", 
+    "platforms": [
+      "mac", 
+      "linux"
+    ], 
+    "uses_polling": false
+  }, 
+  {
+    "args": [
+      "test/core/security/corpus/alts_credentials_corpus/02aa629c8b16cd17a44f3a0efec2feed43937642"
+    ], 
+    "ci_platforms": [
+      "linux"
+    ], 
+    "cpu_cost": 0.1, 
+    "exclude_configs": [
+      "tsan"
+    ], 
+    "exclude_iomgrs": [
+      "uv"
+    ], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "alts_credentials_fuzzer_one_entry", 
+    "platforms": [
+      "mac", 
+      "linux"
+    ], 
+    "uses_polling": false
+  }, 
+  {
+    "args": [
+      "test/core/security/corpus/alts_credentials_corpus/0347878242034088ad7c7c28eb11db03ca822e58"
+    ], 
+    "ci_platforms": [
+      "linux"
+    ], 
+    "cpu_cost": 0.1, 
+    "exclude_configs": [
+      "tsan"
+    ], 
+    "exclude_iomgrs": [
+      "uv"
+    ], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "alts_credentials_fuzzer_one_entry", 
+    "platforms": [
+      "mac", 
+      "linux"
+    ], 
+    "uses_polling": false
+  }, 
+  {
+    "args": [
+      "test/core/security/corpus/alts_credentials_corpus/0441d29f2bdd1c416f08f727fc6676e52ebc3355"
+    ], 
+    "ci_platforms": [
+      "linux"
+    ], 
+    "cpu_cost": 0.1, 
+    "exclude_configs": [
+      "tsan"
+    ], 
+    "exclude_iomgrs": [
+      "uv"
+    ], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "alts_credentials_fuzzer_one_entry", 
+    "platforms": [
+      "mac", 
+      "linux"
+    ], 
+    "uses_polling": false
+  }, 
+  {
+    "args": [
+      "test/core/security/corpus/alts_credentials_corpus/061ea4a089fd8f90f0bc0a6ee9a1eabe92a458cb"
+    ], 
+    "ci_platforms": [
+      "linux"
+    ], 
+    "cpu_cost": 0.1, 
+    "exclude_configs": [
+      "tsan"
+    ], 
+    "exclude_iomgrs": [
+      "uv"
+    ], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "alts_credentials_fuzzer_one_entry", 
+    "platforms": [
+      "mac", 
+      "linux"
+    ], 
+    "uses_polling": false
+  }, 
+  {
+    "args": [
+      "test/core/security/corpus/alts_credentials_corpus/066736c74eec62138d0344ff0e16a38793c21e79"
+    ], 
+    "ci_platforms": [
+      "linux"
+    ], 
+    "cpu_cost": 0.1, 
+    "exclude_configs": [
+      "tsan"
+    ], 
+    "exclude_iomgrs": [
+      "uv"
+    ], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "alts_credentials_fuzzer_one_entry", 
+    "platforms": [
+      "mac", 
+      "linux"
+    ], 
+    "uses_polling": false
+  }, 
+  {
+    "args": [
+      "test/core/security/corpus/alts_credentials_corpus/078558172f7a3a29d203c50fe9c0be8c806ee2fa"
+    ], 
+    "ci_platforms": [
+      "linux"
+    ], 
+    "cpu_cost": 0.1, 
+    "exclude_configs": [
+      "tsan"
+    ], 
+    "exclude_iomgrs": [
+      "uv"
+    ], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "alts_credentials_fuzzer_one_entry", 
+    "platforms": [
+      "mac", 
+      "linux"
+    ], 
+    "uses_polling": false
+  }, 
+  {
+    "args": [
+      "test/core/security/corpus/alts_credentials_corpus/0a561496ff07895c3de6d379c8515400328e8132"
+    ], 
+    "ci_platforms": [
+      "linux"
+    ], 
+    "cpu_cost": 0.1, 
+    "exclude_configs": [
+      "tsan"
+    ], 
+    "exclude_iomgrs": [
+      "uv"
+    ], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "alts_credentials_fuzzer_one_entry", 
+    "platforms": [
+      "mac", 
+      "linux"
+    ], 
+    "uses_polling": false
+  }, 
+  {
+    "args": [
+      "test/core/security/corpus/alts_credentials_corpus/0de032c15a96c8c6df906845bf46a327c95b4c61"
+    ], 
+    "ci_platforms": [
+      "linux"
+    ], 
+    "cpu_cost": 0.1, 
+    "exclude_configs": [
+      "tsan"
+    ], 
+    "exclude_iomgrs": [
+      "uv"
+    ], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "alts_credentials_fuzzer_one_entry", 
+    "platforms": [
+      "mac", 
+      "linux"
+    ], 
+    "uses_polling": false
+  }, 
+  {
+    "args": [
+      "test/core/security/corpus/alts_credentials_corpus/0fe0afc1eeef58aa25a0332282bec4b23c15ad2c"
+    ], 
+    "ci_platforms": [
+      "linux"
+    ], 
+    "cpu_cost": 0.1, 
+    "exclude_configs": [
+      "tsan"
+    ], 
+    "exclude_iomgrs": [
+      "uv"
+    ], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "alts_credentials_fuzzer_one_entry", 
+    "platforms": [
+      "mac", 
+      "linux"
+    ], 
+    "uses_polling": false
+  }, 
+  {
+    "args": [
+      "test/core/security/corpus/alts_credentials_corpus/109441567b1fad6198b1a388895a2bd3654483d8"
+    ], 
+    "ci_platforms": [
+      "linux"
+    ], 
+    "cpu_cost": 0.1, 
+    "exclude_configs": [
+      "tsan"
+    ], 
+    "exclude_iomgrs": [
+      "uv"
+    ], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "alts_credentials_fuzzer_one_entry", 
+    "platforms": [
+      "mac", 
+      "linux"
+    ], 
+    "uses_polling": false
+  }, 
+  {
+    "args": [
+      "test/core/security/corpus/alts_credentials_corpus/11d890d9004b695f3468cc03179eab06ba2c07fb"
+    ], 
+    "ci_platforms": [
+      "linux"
+    ], 
+    "cpu_cost": 0.1, 
+    "exclude_configs": [
+      "tsan"
+    ], 
+    "exclude_iomgrs": [
+      "uv"
+    ], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "alts_credentials_fuzzer_one_entry", 
+    "platforms": [
+      "mac", 
+      "linux"
+    ], 
+    "uses_polling": false
+  }, 
+  {
+    "args": [
+      "test/core/security/corpus/alts_credentials_corpus/1212b598455391501de16b54bddbe4f5343a4a88"
+    ], 
+    "ci_platforms": [
+      "linux"
+    ], 
+    "cpu_cost": 0.1, 
+    "exclude_configs": [
+      "tsan"
+    ], 
+    "exclude_iomgrs": [
+      "uv"
+    ], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "alts_credentials_fuzzer_one_entry", 
+    "platforms": [
+      "mac", 
+      "linux"
+    ], 
+    "uses_polling": false
+  }, 
+  {
+    "args": [
+      "test/core/security/corpus/alts_credentials_corpus/1666e8aa226a18bf64f2785a2f9be28fc4af01cb"
+    ], 
+    "ci_platforms": [
+      "linux"
+    ], 
+    "cpu_cost": 0.1, 
+    "exclude_configs": [
+      "tsan"
+    ], 
+    "exclude_iomgrs": [
+      "uv"
+    ], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "alts_credentials_fuzzer_one_entry", 
+    "platforms": [
+      "mac", 
+      "linux"
+    ], 
+    "uses_polling": false
+  }, 
+  {
+    "args": [
+      "test/core/security/corpus/alts_credentials_corpus/16e58db814acc76c24ba50eb3d89b24ddd494454"
+    ], 
+    "ci_platforms": [
+      "linux"
+    ], 
+    "cpu_cost": 0.1, 
+    "exclude_configs": [
+      "tsan"
+    ], 
+    "exclude_iomgrs": [
+      "uv"
+    ], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "alts_credentials_fuzzer_one_entry", 
+    "platforms": [
+      "mac", 
+      "linux"
+    ], 
+    "uses_polling": false
+  }, 
+  {
+    "args": [
+      "test/core/security/corpus/alts_credentials_corpus/1af35e95ed0090ae0ee489453e850a2600a225c8"
+    ], 
+    "ci_platforms": [
+      "linux"
+    ], 
+    "cpu_cost": 0.1, 
+    "exclude_configs": [
+      "tsan"
+    ], 
+    "exclude_iomgrs": [
+      "uv"
+    ], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "alts_credentials_fuzzer_one_entry", 
+    "platforms": [
+      "mac", 
+      "linux"
+    ], 
+    "uses_polling": false
+  }, 
+  {
+    "args": [
+      "test/core/security/corpus/alts_credentials_corpus/1c654b103763405d321d090adbcda783bf447ef7"
+    ], 
+    "ci_platforms": [
+      "linux"
+    ], 
+    "cpu_cost": 0.1, 
+    "exclude_configs": [
+      "tsan"
+    ], 
+    "exclude_iomgrs": [
+      "uv"
+    ], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "alts_credentials_fuzzer_one_entry", 
+    "platforms": [
+      "mac", 
+      "linux"
+    ], 
+    "uses_polling": false
+  }, 
+  {
+    "args": [
+      "test/core/security/corpus/alts_credentials_corpus/1c8e404bae365315af2427626ea2f2475e9ae117"
+    ], 
+    "ci_platforms": [
+      "linux"
+    ], 
+    "cpu_cost": 0.1, 
+    "exclude_configs": [
+      "tsan"
+    ], 
+    "exclude_iomgrs": [
+      "uv"
+    ], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "alts_credentials_fuzzer_one_entry", 
+    "platforms": [
+      "mac", 
+      "linux"
+    ], 
+    "uses_polling": false
+  }, 
+  {
+    "args": [
+      "test/core/security/corpus/alts_credentials_corpus/1e9a89f1f2ad84637da91f9d5d9b2b4201d59079"
+    ], 
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author	Yihua Zhang <yihuaz@google.com>	2018-05-08 10:15:03 -0700
committer	Yihua Zhang <yihuaz@google.com>	2018-05-08 10:15:03 -0700
commit	cc93663910cd17f6d1faeef020ec0b3fc27df263 (patch)
tree	af57bcf1d818c15f3e72f690ab67fc278296a0fe
parent	d8f35e95dc48b144c741e70dc90589c374854a64 (diff)