Add TSI test library and SSL and fake TSI tests

5 files changed, 1472 insertions, 1 deletions

diff --git a/test/core/tsi/BUILD b/test/core/tsi/BUILD
index 3bbc50b27e..1b9099e986 100644
--- a/test/core/tsi/BUILD
+++ b/test/core/tsi/BUILD
@@ -23,13 +23,63 @@ package(
     ],
 )
 
+grpc_cc_library(
+    name = "transport_security_test_lib",
+    srcs = ["transport_security_test_lib.c"],
+    hdrs = ["transport_security_test_lib.h"],
+    deps = [
+        "//:grpc",
+        "//:tsi",
+    ],
+)
+
+grpc_cc_test(
+    name = "fake_transport_security_test",
+    srcs = ["fake_transport_security_test.c"],
+    language = "C",
+    deps = [
+        ":transport_security_test_lib",
+        "//:grpc",
+        "//:gpr",
+        "//:tsi",
+        "//test/core/util:gpr_test_util",
+    ],
+)
+
+
+grpc_cc_test(
+    name = "ssl_transport_security_test",
+    srcs = ["ssl_transport_security_test.c"],
+    data = [
+        "//src/core/tsi/test_creds:badclient.key",
+        "//src/core/tsi/test_creds:badclient.pem",
+        "//src/core/tsi/test_creds:badserver.key",
+        "//src/core/tsi/test_creds:badserver.pem",
+        "//src/core/tsi/test_creds:ca.pem",
+        "//src/core/tsi/test_creds:client.key",
+        "//src/core/tsi/test_creds:client.pem",
+        "//src/core/tsi/test_creds:server0.key",
+        "//src/core/tsi/test_creds:server0.pem",
+        "//src/core/tsi/test_creds:server1.key",
+        "//src/core/tsi/test_creds:server1.pem",
+    ],
+    language = "C",
+    deps = [
+        ":transport_security_test_lib",
+        "//:grpc",
+        "//:gpr",
+        "//:tsi",
+        "//test/core/util:gpr_test_util",
+    ],
+)
+
 grpc_cc_test(
     name = "transport_security_test",
     srcs = ["transport_security_test.c"],
     language = "C",
     deps = [
-        "//:gpr",
         "//:grpc",
+        "//:gpr",
         "//test/core/util:gpr_test_util",
         "//test/core/util:grpc_test_util",
     ],
diff --git a/test/core/tsi/fake_transport_security_test.c b/test/core/tsi/fake_transport_security_test.c
new file mode 100644
index 0000000000..11be8802b7
--- /dev/null
+++ b/test/core/tsi/fake_transport_security_test.c
@@ -0,0 +1,148 @@
+/*
+ *
+ * Copyright 2017 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 <stdbool.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "src/core/lib/security/transport/security_connector.h"
+#include "src/core/tsi/fake_transport_security.h"
+#include "test/core/tsi/transport_security_test_lib.h"
+#include "test/core/util/test_config.h"
+
+#include <grpc/grpc.h>
+#include <grpc/support/alloc.h>
+#include <grpc/support/log.h>
+
+typedef struct fake_tsi_test_fixture {
+  tsi_test_fixture base;
+} fake_tsi_test_fixture;
+
+static void fake_test_setup_handshakers(tsi_test_fixture *fixture) {
+  fixture->client_handshaker =
+      tsi_create_fake_handshaker(true /* is_client. */);
+  fixture->server_handshaker =
+      tsi_create_fake_handshaker(false /* is_client. */);
+}
+
+static void validate_handshaker_peers(tsi_handshaker_result *result) {
+  GPR_ASSERT(result != NULL);
+  tsi_peer peer;
+  GPR_ASSERT(tsi_handshaker_result_extract_peer(result, &peer) == TSI_OK);
+  const tsi_peer_property *property =
+      tsi_peer_get_property_by_name(&peer, TSI_CERTIFICATE_TYPE_PEER_PROPERTY);
+  GPR_ASSERT(property != NULL);
+  GPR_ASSERT(memcmp(property->value.data, TSI_FAKE_CERTIFICATE_TYPE,
+                    property->value.length) == 0);
+  tsi_peer_destruct(&peer);
+}
+
+static void fake_test_check_handshaker_peers(tsi_test_fixture *fixture) {
+  validate_handshaker_peers(fixture->client_result);
+  validate_handshaker_peers(fixture->server_result);
+}
+
+static void fake_test_destruct(tsi_test_fixture *fixture) {}
+
+static const struct tsi_test_fixture_vtable vtable = {
+    fake_test_setup_handshakers, fake_test_check_handshaker_peers,
+    fake_test_destruct};
+
+static tsi_test_fixture *fake_tsi_test_fixture_create() {
+  fake_tsi_test_fixture *fake_fixture = gpr_zalloc(sizeof(*fake_fixture));
+  tsi_test_fixture_init(&fake_fixture->base);
+  fake_fixture->base.vtable = &vtable;
+  return &fake_fixture->base;
+}
+
+void fake_tsi_test_do_handshake_tiny_handshake_buffer() {
+  tsi_test_fixture *fixture = fake_tsi_test_fixture_create();
+  fixture->handshake_buffer_size = TSI_TEST_TINY_HANDSHAKE_BUFFER_SIZE;
+  tsi_test_do_handshake(fixture);
+  tsi_test_fixture_destroy(fixture);
+}
+
+void fake_tsi_test_do_handshake_small_handshake_buffer() {
+  tsi_test_fixture *fixture = fake_tsi_test_fixture_create();
+  fixture->handshake_buffer_size = TSI_TEST_SMALL_HANDSHAKE_BUFFER_SIZE;
+  tsi_test_do_handshake(fixture);
+  tsi_test_fixture_destroy(fixture);
+}
+
+void fake_tsi_test_do_handshake() {
+  tsi_test_fixture *fixture = fake_tsi_test_fixture_create();
+  tsi_test_do_handshake(fixture);
+  tsi_test_fixture_destroy(fixture);
+}
+
+void fake_tsi_test_do_round_trip_for_all_configs() {
+  unsigned int *bit_array =
+      gpr_zalloc(sizeof(unsigned int) * TSI_TEST_NUM_OF_ARGUMENTS);
+  const unsigned int mask = 1U << (TSI_TEST_NUM_OF_ARGUMENTS - 1);
+  for (unsigned int val = 0; val < TSI_TEST_NUM_OF_COMBINATIONS; val++) {
+    unsigned int v = val;
+    for (unsigned int ind = 0; ind < TSI_TEST_NUM_OF_ARGUMENTS; ind++) {
+      bit_array[ind] = (v & mask) ? 1 : 0;
+      v <<= 1;
+    }
+    tsi_test_fixture *fixture = fake_tsi_test_fixture_create();
+    fake_tsi_test_fixture *fake_fixture = (fake_tsi_test_fixture *)fixture;
+    tsi_test_frame_protector_config_destroy(fake_fixture->base.config);
+    fake_fixture->base.config = tsi_test_frame_protector_config_create(
+        bit_array[0], bit_array[1], bit_array[2], bit_array[3], bit_array[4],
+        bit_array[5], bit_array[6], bit_array[7]);
+    tsi_test_do_round_trip(&fake_fixture->base);
+    tsi_test_fixture_destroy(fixture);
+  }
+  gpr_free(bit_array);
+}
+
+void fake_tsi_test_do_round_trip_odd_buffer_size() {
+  const size_t odd_sizes[] = {1025, 2051, 4103, 8207, 16409};
+  const size_t size = sizeof(odd_sizes) / sizeof(size_t);
+  for (size_t ind1 = 0; ind1 < size; ind1++) {
+    for (size_t ind2 = 0; ind2 < size; ind2++) {
+      for (size_t ind3 = 0; ind3 < size; ind3++) {
+        for (size_t ind4 = 0; ind4 < size; ind4++) {
+          for (size_t ind5 = 0; ind5 < size; ind5++) {
+            tsi_test_fixture *fixture = fake_tsi_test_fixture_create();
+            fake_tsi_test_fixture *fake_fixture =
+                (fake_tsi_test_fixture *)fixture;
+            tsi_test_frame_protector_config_set_buffer_size(
+                fake_fixture->base.config, odd_sizes[ind1], odd_sizes[ind2],
+                odd_sizes[ind3], odd_sizes[ind4], odd_sizes[ind5]);
+            tsi_test_do_round_trip(&fake_fixture->base);
+            tsi_test_fixture_destroy(fixture);
+          }
+        }
+      }
+    }
+  }
+}
+
+int main(int argc, char **argv) {
+  grpc_test_init(argc, argv);
+  grpc_init();
+  fake_tsi_test_do_handshake_tiny_handshake_buffer();
+  fake_tsi_test_do_handshake_small_handshake_buffer();
+  fake_tsi_test_do_handshake();
+  fake_tsi_test_do_round_trip_for_all_configs();
+  fake_tsi_test_do_round_trip_odd_buffer_size();
+  grpc_shutdown();
+  return 0;
+}
diff --git a/test/core/tsi/ssl_transport_security_test.c b/test/core/tsi/ssl_transport_security_test.c
new file mode 100644
index 0000000000..364dfa1b73
--- /dev/null
+++ b/test/core/tsi/ssl_transport_security_test.c
@@ -0,0 +1,558 @@
+/*
+ *
+ * Copyright 2017 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 <stdbool.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "src/core/lib/iomgr/load_file.h"
+#include "src/core/lib/security/transport/security_connector.h"
+#include "src/core/tsi/ssl_transport_security.h"
+#include "src/core/tsi/transport_security_adapter.h"
+#include "test/core/tsi/transport_security_test_lib.h"
+#include "test/core/util/test_config.h"
+
+#include <grpc/grpc.h>
+#include <grpc/support/alloc.h>
+#include <grpc/support/log.h>
+#include <grpc/support/string_util.h>
+
+#define SSL_TSI_TEST_ALPN1 "foo"
+#define SSL_TSI_TEST_ALPN2 "toto"
+#define SSL_TSI_TEST_ALPN3 "baz"
+#define SSL_TSI_TEST_ALPN_NUM 2
+#define SSL_TSI_TEST_SERVER_KEY_CERT_PAIRS_NUM 2
+#define SSL_TSI_TEST_BAD_SERVER_KEY_CERT_PAIRS_NUM 1
+#define SSL_TSI_TEST_CREDENTIALS_DIR "src/core/tsi/test_creds/"
+
+typedef enum AlpnMode {
+  NO_ALPN,
+  ALPN_CLIENT_NO_SERVER,
+  ALPN_SERVER_NO_CLIENT,
+  ALPN_CLIENT_SERVER_OK,
+  ALPN_CLIENT_SERVER_MISMATCH
+} AlpnMode;
+
+typedef struct ssl_alpn_lib {
+  AlpnMode alpn_mode;
+  char **server_alpn_protocols;
+  char **client_alpn_protocols;
+  uint16_t num_server_alpn_protocols;
+  uint16_t num_client_alpn_protocols;
+} ssl_alpn_lib;
+
+typedef struct ssl_key_cert_lib {
+  bool use_bad_server_cert;
+  bool use_bad_client_cert;
+  char *root_cert;
+  tsi_ssl_pem_key_cert_pair *server_pem_key_cert_pairs;
+  tsi_ssl_pem_key_cert_pair *bad_server_pem_key_cert_pairs;
+  tsi_ssl_pem_key_cert_pair client_pem_key_cert_pair;
+  tsi_ssl_pem_key_cert_pair bad_client_pem_key_cert_pair;
+  uint16_t server_num_key_cert_pairs;
+  uint16_t bad_server_num_key_cert_pairs;
+} ssl_key_cert_lib;
+
+typedef struct ssl_tsi_test_fixture {
+  tsi_test_fixture base;
+  ssl_key_cert_lib *key_cert_lib;
+  ssl_alpn_lib *alpn_lib;
+  bool force_client_auth;
+  char *server_name_indication;
+  tsi_ssl_server_handshaker_factory *server_handshaker_factory;
+  tsi_ssl_client_handshaker_factory *client_handshaker_factory;
+} ssl_tsi_test_fixture;
+
+static void ssl_test_setup_handshakers(tsi_test_fixture *fixture) {
+  ssl_tsi_test_fixture *ssl_fixture = (ssl_tsi_test_fixture *)fixture;
+  GPR_ASSERT(ssl_fixture != NULL);
+  GPR_ASSERT(ssl_fixture->key_cert_lib != NULL);
+  GPR_ASSERT(ssl_fixture->alpn_lib != NULL);
+  ssl_key_cert_lib *key_cert_lib = ssl_fixture->key_cert_lib;
+  ssl_alpn_lib *alpn_lib = ssl_fixture->alpn_lib;
+  /* Create client handshaker factory. */
+  tsi_ssl_pem_key_cert_pair *client_key_cert_pair = NULL;
+  if (ssl_fixture->force_client_auth) {
+    client_key_cert_pair = key_cert_lib->use_bad_client_cert
+                               ? &key_cert_lib->bad_client_pem_key_cert_pair
+                               : &key_cert_lib->client_pem_key_cert_pair;
+  }
+  char **client_alpn_protocols = NULL;
+  uint16_t num_client_alpn_protocols = 0;
+  if (alpn_lib->alpn_mode == ALPN_CLIENT_NO_SERVER ||
+      alpn_lib->alpn_mode == ALPN_CLIENT_SERVER_OK ||
+      alpn_lib->alpn_mode == ALPN_CLIENT_SERVER_MISMATCH) {
+    client_alpn_protocols = alpn_lib->client_alpn_protocols;
+    num_client_alpn_protocols = alpn_lib->num_client_alpn_protocols;
+  }
+  GPR_ASSERT(tsi_create_ssl_client_handshaker_factory(
+                 client_key_cert_pair, key_cert_lib->root_cert, NULL,
+                 (const char **)client_alpn_protocols,
+                 num_client_alpn_protocols,
+                 &ssl_fixture->client_handshaker_factory) == TSI_OK);
+  /* Create server handshaker factory. */
+  char **server_alpn_protocols = NULL;
+  uint16_t num_server_alpn_protocols = 0;
+  if (alpn_lib->alpn_mode == ALPN_SERVER_NO_CLIENT ||
+      alpn_lib->alpn_mode == ALPN_CLIENT_SERVER_OK ||
+      alpn_lib->alpn_mode == ALPN_CLIENT_SERVER_MISMATCH) {
+    server_alpn_protocols = alpn_lib->server_alpn_protocols;
+    num_server_alpn_protocols = alpn_lib->num_server_alpn_protocols;
+    if (alpn_lib->alpn_mode == ALPN_CLIENT_SERVER_MISMATCH) {
+      num_server_alpn_protocols--;
+    }
+  }
+  GPR_ASSERT(tsi_create_ssl_server_handshaker_factory(
+                 key_cert_lib->use_bad_server_cert
+                     ? key_cert_lib->bad_server_pem_key_cert_pairs
+                     : key_cert_lib->server_pem_key_cert_pairs,
+                 key_cert_lib->use_bad_server_cert
+                     ? key_cert_lib->bad_server_num_key_cert_pairs
+                     : key_cert_lib->server_num_key_cert_pairs,
+                 key_cert_lib->root_cert, ssl_fixture->force_client_auth, NULL,
+                 (const char **)server_alpn_protocols,
+                 num_server_alpn_protocols,
+                 &ssl_fixture->server_handshaker_factory) == TSI_OK);
+  /* Create server and client handshakers. */
+  tsi_handshaker *client_handshaker = NULL;
+  GPR_ASSERT(tsi_ssl_client_handshaker_factory_create_handshaker(
+                 ssl_fixture->client_handshaker_factory,
+                 ssl_fixture->server_name_indication,
+                 &client_handshaker) == TSI_OK);
+  ssl_fixture->base.client_handshaker =
+      tsi_create_adapter_handshaker(client_handshaker);
+  tsi_handshaker *server_handshaker = NULL;
+  GPR_ASSERT(tsi_ssl_server_handshaker_factory_create_handshaker(
+                 ssl_fixture->server_handshaker_factory, &server_handshaker) ==
+             TSI_OK);
+  ssl_fixture->base.server_handshaker =
+      tsi_create_adapter_handshaker(server_handshaker);
+}
+
+static void check_alpn(ssl_tsi_test_fixture *ssl_fixture,
+                       const tsi_peer *peer) {
+  GPR_ASSERT(ssl_fixture != NULL);
+  GPR_ASSERT(ssl_fixture->alpn_lib != NULL);
+  ssl_alpn_lib *alpn_lib = ssl_fixture->alpn_lib;
+  const tsi_peer_property *alpn_property =
+      tsi_peer_get_property_by_name(peer, TSI_SSL_ALPN_SELECTED_PROTOCOL);
+  if (alpn_lib->alpn_mode != ALPN_CLIENT_SERVER_OK) {
+    GPR_ASSERT(alpn_property == NULL);
+  } else {
+    GPR_ASSERT(alpn_property != NULL);
+    const char *expected_match = "baz";
+    GPR_ASSERT(memcmp(alpn_property->value.data, expected_match,
+                      alpn_property->value.length) == 0);
+  }
+}
+
+static const tsi_peer_property *
+check_basic_authenticated_peer_and_get_common_name(const tsi_peer *peer) {
+  const tsi_peer_property *cert_type_property =
+      tsi_peer_get_property_by_name(peer, TSI_CERTIFICATE_TYPE_PEER_PROPERTY);
+  GPR_ASSERT(cert_type_property != NULL);
+  GPR_ASSERT(memcmp(cert_type_property->value.data, TSI_X509_CERTIFICATE_TYPE,
+                    cert_type_property->value.length) == 0);
+  const tsi_peer_property *property = tsi_peer_get_property_by_name(
+      peer, TSI_X509_SUBJECT_COMMON_NAME_PEER_PROPERTY);
+  GPR_ASSERT(property != NULL);
+  return property;
+}
+
+void check_server0_peer(tsi_peer *peer) {
+  const tsi_peer_property *property =
+      check_basic_authenticated_peer_and_get_common_name(peer);
+  const char *expected_match = "*.test.google.com.au";
+  GPR_ASSERT(memcmp(property->value.data, expected_match,
+                    property->value.length) == 0);
+  GPR_ASSERT(tsi_peer_get_property_by_name(
+                 peer, TSI_X509_SUBJECT_ALTERNATIVE_NAME_PEER_PROPERTY) ==
+             NULL);
+  GPR_ASSERT(tsi_ssl_peer_matches_name(peer, "foo.test.google.com.au") == 1);
+  GPR_ASSERT(tsi_ssl_peer_matches_name(peer, "bar.test.google.com.au") == 1);
+  GPR_ASSERT(tsi_ssl_peer_matches_name(peer, "bar.test.google.blah") == 0);
+  GPR_ASSERT(tsi_ssl_peer_matches_name(peer, "foo.bar.test.google.com.au") ==
+             0);
+  GPR_ASSERT(tsi_ssl_peer_matches_name(peer, "test.google.com.au") == 0);
+  tsi_peer_destruct(peer);
+}
+
+static bool check_subject_alt_name(tsi_peer *peer, const char *name) {
+  for (size_t i = 0; i < peer->property_count; i++) {
+    const tsi_peer_property *prop = &peer->properties[i];
+    if (strcmp(prop->name, TSI_X509_SUBJECT_ALTERNATIVE_NAME_PEER_PROPERTY) ==
+        0) {
+      if (memcmp(prop->value.data, name, prop->value.length) == 0) {
+        return true;
+      }
+    }
+  }
+  return false;
+}
+
+void check_server1_peer(tsi_peer *peer) {
+  const tsi_peer_property *property =
+      check_basic_authenticated_peer_and_get_common_name(peer);
+  const char *expected_match = "*.test.google.com";
+  GPR_ASSERT(memcmp(property->value.data, expected_match,
+                    property->value.length) == 0);
+  GPR_ASSERT(check_subject_alt_name(peer, "*.test.google.fr") == 1);
+  GPR_ASSERT(check_subject_alt_name(peer, "waterzooi.test.google.be") == 1);
+  GPR_ASSERT(tsi_ssl_peer_matches_name(peer, "foo.test.google.fr") == 1);
+  GPR_ASSERT(tsi_ssl_peer_matches_name(peer, "bar.test.google.fr") == 1);
+  GPR_ASSERT(tsi_ssl_peer_matches_name(peer, "waterzooi.test.google.be") == 1);
+  GPR_ASSERT(tsi_ssl_peer_matches_name(peer, "foo.test.youtube.com") == 1);
+  GPR_ASSERT(tsi_ssl_peer_matches_name(peer, "bar.foo.test.google.com") == 0);
+  GPR_ASSERT(tsi_ssl_peer_matches_name(peer, "test.google.fr") == 0);
+  GPR_ASSERT(tsi_ssl_peer_matches_name(peer, "tartines.test.google.be") == 0);
+  GPR_ASSERT(tsi_ssl_peer_matches_name(peer, "tartines.youtube.com") == 0);
+  tsi_peer_destruct(peer);
+}
+
+static void check_client_peer(ssl_tsi_test_fixture *ssl_fixture,
+                              tsi_peer *peer) {
+  GPR_ASSERT(ssl_fixture != NULL);
+  GPR_ASSERT(ssl_fixture->alpn_lib != NULL);
+  ssl_alpn_lib *alpn_lib = ssl_fixture->alpn_lib;
+  if (!ssl_fixture->force_client_auth) {
+    GPR_ASSERT(peer->property_count ==
+               (alpn_lib->alpn_mode == ALPN_CLIENT_SERVER_OK ? 1 : 0));
+  } else {
+    const tsi_peer_property *property =
+        check_basic_authenticated_peer_and_get_common_name(peer);
+    const char *expected_match = "testclient";
+    GPR_ASSERT(memcmp(property->value.data, expected_match,
+                      property->value.length) == 0);
+  }
+  tsi_peer_destruct(peer);
+}
+
+static void ssl_test_check_handshaker_peers(tsi_test_fixture *fixture) {
+  ssl_tsi_test_fixture *ssl_fixture = (ssl_tsi_test_fixture *)fixture;
+  GPR_ASSERT(ssl_fixture != NULL);
+  GPR_ASSERT(ssl_fixture->key_cert_lib != NULL);
+  ssl_key_cert_lib *key_cert_lib = ssl_fixture->key_cert_lib;
+  tsi_peer peer;
+  bool expect_success =
+      !(key_cert_lib->use_bad_server_cert ||
+        (key_cert_lib->use_bad_client_cert && ssl_fixture->force_client_auth));
+  if (expect_success) {
+    GPR_ASSERT(tsi_handshaker_result_extract_peer(
+                   ssl_fixture->base.client_result, &peer) == TSI_OK);
+    check_alpn(ssl_fixture, &peer);
+
+    if (ssl_fixture->server_name_indication != NULL) {
+      check_server1_peer(&peer);
+    } else {
+      check_server0_peer(&peer);
+    }
+  } else {
+    GPR_ASSERT(ssl_fixture->base.client_result == NULL);
+  }
+  if (expect_success) {
+    GPR_ASSERT(tsi_handshaker_result_extract_peer(
+                   ssl_fixture->base.server_result, &peer) == TSI_OK);
+    check_alpn(ssl_fixture, &peer);
+    check_client_peer(ssl_fixture, &peer);
+  } else {
+    GPR_ASSERT(ssl_fixture->base.server_result == NULL);
+  }
+}
+
+static void ssl_test_pem_key_cert_pair_destroy(tsi_ssl_pem_key_cert_pair kp) {
+  gpr_free((void *)kp.private_key);
+  gpr_free((void *)kp.cert_chain);
+}
+
+static void ssl_test_destruct(tsi_test_fixture *fixture) {
+  ssl_tsi_test_fixture *ssl_fixture = (ssl_tsi_test_fixture *)fixture;
+  if (ssl_fixture == NULL) {
+    return;
+  }
+  /* Destroy ssl_alpn_lib. */
+  ssl_alpn_lib *alpn_lib = ssl_fixture->alpn_lib;
+  for (size_t i = 0; i < alpn_lib->num_server_alpn_protocols; i++) {
+    gpr_free(alpn_lib->server_alpn_protocols[i]);
+  }
+  gpr_free(alpn_lib->server_alpn_protocols);
+  for (size_t i = 0; i < alpn_lib->num_client_alpn_protocols; i++) {
+    gpr_free(alpn_lib->client_alpn_protocols[i]);
+  }
+  gpr_free(alpn_lib->client_alpn_protocols);
+  gpr_free(alpn_lib);
+  /* Destroy ssl_key_cert_lib. */
+  ssl_key_cert_lib *key_cert_lib = ssl_fixture->key_cert_lib;
+  for (size_t i = 0; i < key_cert_lib->server_num_key_cert_pairs; i++) {
+    ssl_test_pem_key_cert_pair_destroy(
+        key_cert_lib->server_pem_key_cert_pairs[i]);
+  }
+  gpr_free(key_cert_lib->server_pem_key_cert_pairs);
+  for (size_t i = 0; i < key_cert_lib->bad_server_num_key_cert_pairs; i++) {
+    ssl_test_pem_key_cert_pair_destroy(
+        key_cert_lib->bad_server_pem_key_cert_pairs[i]);
+  }
+  gpr_free(key_cert_lib->bad_server_pem_key_cert_pairs);
+  ssl_test_pem_key_cert_pair_destroy(key_cert_lib->client_pem_key_cert_pair);
+  ssl_test_pem_key_cert_pair_destroy(
+      key_cert_lib->bad_client_pem_key_cert_pair);
+  gpr_free(key_cert_lib->root_cert);
+  gpr_free(key_cert_lib);
+  /* Destroy others. */
+  tsi_ssl_server_handshaker_factory_destroy(
+      ssl_fixture->server_handshaker_factory);
+  tsi_ssl_client_handshaker_factory_destroy(
+      ssl_fixture->client_handshaker_factory);
+}
+
+static const struct tsi_test_fixture_vtable vtable = {
+    ssl_test_setup_handshakers, ssl_test_check_handshaker_peers,
+    ssl_test_destruct};
+
+static char *load_file(const char *dir_path, const char *file_name) {
+  char *file_path =
+      gpr_zalloc(sizeof(char) * (strlen(dir_path) + strlen(file_name) + 1));
+  memcpy(file_path, dir_path, strlen(dir_path));
+  memcpy(file_path + strlen(dir_path), file_name, strlen(file_name));
+  grpc_slice slice;
+  GPR_ASSERT(grpc_load_file(file_path, 1, &slice) == GRPC_ERROR_NONE);
+  char *data = grpc_slice_to_c_string(slice);
+  grpc_slice_unref(slice);
+  gpr_free(file_path);
+  return data;
+}
+
+static tsi_test_fixture *ssl_tsi_test_fixture_create() {
+  ssl_tsi_test_fixture *ssl_fixture = gpr_zalloc(sizeof(*ssl_fixture));
+  tsi_test_fixture_init(&ssl_fixture->base);
+  ssl_fixture->base.test_unused_bytes = false;
+  ssl_fixture->base.vtable = &vtable;
+  /* Create ssl_key_cert_lib. */
+  ssl_key_cert_lib *key_cert_lib = gpr_zalloc(sizeof(*key_cert_lib));
+  key_cert_lib->use_bad_server_cert = false;
+  key_cert_lib->use_bad_client_cert = false;
+  key_cert_lib->server_num_key_cert_pairs =
+      SSL_TSI_TEST_SERVER_KEY_CERT_PAIRS_NUM;
+  key_cert_lib->bad_server_num_key_cert_pairs =
+      SSL_TSI_TEST_BAD_SERVER_KEY_CERT_PAIRS_NUM;
+  key_cert_lib->server_pem_key_cert_pairs =
+      gpr_malloc(sizeof(tsi_ssl_pem_key_cert_pair) *
+                 key_cert_lib->server_num_key_cert_pairs);
+  key_cert_lib->bad_server_pem_key_cert_pairs =
+      gpr_malloc(sizeof(tsi_ssl_pem_key_cert_pair) *
+                 key_cert_lib->bad_server_num_key_cert_pairs);
+  key_cert_lib->server_pem_key_cert_pairs[0].private_key =
+      load_file(SSL_TSI_TEST_CREDENTIALS_DIR, "server0.key");
+  key_cert_lib->server_pem_key_cert_pairs[0].cert_chain =
+      load_file(SSL_TSI_TEST_CREDENTIALS_DIR, "server0.pem");
+  key_cert_lib->server_pem_key_cert_pairs[1].private_key =
+      load_file(SSL_TSI_TEST_CREDENTIALS_DIR, "server1.key");
+  key_cert_lib->server_pem_key_cert_pairs[1].cert_chain =
+      load_file(SSL_TSI_TEST_CREDENTIALS_DIR, "server1.pem");
+  key_cert_lib->bad_server_pem_key_cert_pairs[0].private_key =
+      load_file(SSL_TSI_TEST_CREDENTIALS_DIR, "badserver.key");
+  key_cert_lib->bad_server_pem_key_cert_pairs[0].cert_chain =
+      load_file(SSL_TSI_TEST_CREDENTIALS_DIR, "badserver.pem");
+  key_cert_lib->client_pem_key_cert_pair.private_key =
+      load_file(SSL_TSI_TEST_CREDENTIALS_DIR, "client.key");
+  key_cert_lib->client_pem_key_cert_pair.cert_chain =
+      load_file(SSL_TSI_TEST_CREDENTIALS_DIR, "client.pem");
+  key_cert_lib->bad_client_pem_key_cert_pair.private_key =
+      load_file(SSL_TSI_TEST_CREDENTIALS_DIR, "badclient.key");
+  key_cert_lib->bad_client_pem_key_cert_pair.cert_chain =
+      load_file(SSL_TSI_TEST_CREDENTIALS_DIR, "badclient.pem");
+  key_cert_lib->root_cert = load_file(SSL_TSI_TEST_CREDENTIALS_DIR, "ca.pem");
+  ssl_fixture->key_cert_lib = key_cert_lib;
+  /* Create ssl_alpn_lib. */
+  ssl_alpn_lib *alpn_lib = gpr_zalloc(sizeof(*alpn_lib));
+  alpn_lib->server_alpn_protocols =
+      gpr_zalloc(sizeof(char *) * SSL_TSI_TEST_ALPN_NUM);
+  alpn_lib->client_alpn_protocols =
+      gpr_zalloc(sizeof(char *) * SSL_TSI_TEST_ALPN_NUM);
+  alpn_lib->server_alpn_protocols[0] = gpr_strdup(SSL_TSI_TEST_ALPN1);
+  alpn_lib->server_alpn_protocols[1] = gpr_strdup(SSL_TSI_TEST_ALPN3);
+  alpn_lib->client_alpn_protocols[0] = gpr_strdup(SSL_TSI_TEST_ALPN2);
+  alpn_lib->client_alpn_protocols[1] = gpr_strdup(SSL_TSI_TEST_ALPN3);
+  alpn_lib->num_server_alpn_protocols = SSL_TSI_TEST_ALPN_NUM;
+  alpn_lib->num_client_alpn_protocols = SSL_TSI_TEST_ALPN_NUM;
+  alpn_lib->alpn_mode = NO_ALPN;
+  ssl_fixture->alpn_lib = alpn_lib;
+  ssl_fixture->base.vtable = &vtable;
+  ssl_fixture->server_name_indication = NULL;
+  ssl_fixture->force_client_auth = false;
+  return &ssl_fixture->base;
+}
+
+void ssl_tsi_test_do_handshake_tiny_handshake_buffer() {
+  tsi_test_fixture *fixture = ssl_tsi_test_fixture_create();
+  fixture->handshake_buffer_size = TSI_TEST_TINY_HANDSHAKE_BUFFER_SIZE;
+  tsi_test_do_handshake(fixture);
+  tsi_test_fixture_destroy(fixture);
+}
+
+void ssl_tsi_test_do_handshake_small_handshake_buffer() {
+  tsi_test_fixture *fixture = ssl_tsi_test_fixture_create();
+  fixture->handshake_buffer_size = TSI_TEST_SMALL_HANDSHAKE_BUFFER_SIZE;
+  tsi_test_do_handshake(fixture);
+  tsi_test_fixture_destroy(fixture);
+}
+
+void ssl_tsi_test_do_handshake() {
+  tsi_test_fixture *fixture = ssl_tsi_test_fixture_create();
+  tsi_test_do_handshake(fixture);
+  tsi_test_fixture_destroy(fixture);
+}
+
+void ssl_tsi_test_do_handshake_with_client_authentication() {
+  tsi_test_fixture *fixture = ssl_tsi_test_fixture_create();
+  ssl_tsi_test_fixture *ssl_fixture = (ssl_tsi_test_fixture *)fixture;
+  ssl_fixture->force_client_auth = true;
+  tsi_test_do_handshake(fixture);
+  tsi_test_fixture_destroy(fixture);
+}
+
+void ssl_tsi_test_do_handshake_with_server_name_indication_exact_domain() {
+  /* server1 cert contains "waterzooi.test.google.be" in SAN. */
+  tsi_test_fixture *fixture = ssl_tsi_test_fixture_create();
+  ssl_tsi_test_fixture *ssl_fixture = (ssl_tsi_test_fixture *)fixture;
+  ssl_fixture->server_name_indication = "waterzooi.test.google.be";
+  tsi_test_do_handshake(fixture);
+  tsi_test_fixture_destroy(fixture);
+}
+
+void ssl_tsi_test_do_handshake_with_server_name_indication_wild_star_domain() {
+  /* server1 cert contains "*.test.google.fr" in SAN. */
+  tsi_test_fixture *fixture = ssl_tsi_test_fixture_create();
+  ssl_tsi_test_fixture *ssl_fixture = (ssl_tsi_test_fixture *)fixture;
+  ssl_fixture->server_name_indication = "juju.test.google.fr";
+  tsi_test_do_handshake(fixture);
+  tsi_test_fixture_destroy(fixture);
+}
+
+void ssl_tsi_test_do_handshake_with_bad_server_cert() {
+  tsi_test_fixture *fixture = ssl_tsi_test_fixture_create();
+  ssl_tsi_test_fixture *ssl_fixture = (ssl_tsi_test_fixture *)fixture;
+  ssl_fixture->key_cert_lib->use_bad_server_cert = true;
+  tsi_test_do_handshake(fixture);
+  tsi_test_fixture_destroy(fixture);
+}
+
+void ssl_tsi_test_do_handshake_with_bad_client_cert() {
+  tsi_test_fixture *fixture = ssl_tsi_test_fixture_create();
+  ssl_tsi_test_fixture *ssl_fixture = (ssl_tsi_test_fixture *)fixture;
+  ssl_fixture->key_cert_lib->use_bad_client_cert = true;
+  ssl_fixture->force_client_auth = true;
+  tsi_test_do_handshake(fixture);
+  tsi_test_fixture_destroy(fixture);
+}
+
+void ssl_tsi_test_do_handshake_alpn_client_no_server() {
+  tsi_test_fixture *fixture = ssl_tsi_test_fixture_create();
+  ssl_tsi_test_fixture *ssl_fixture = (ssl_tsi_test_fixture *)fixture;
+  ssl_fixture->alpn_lib->alpn_mode = ALPN_CLIENT_NO_SERVER;
+  tsi_test_do_handshake(fixture);
+  tsi_test_fixture_destroy(fixture);
+}
+
+void ssl_tsi_test_do_handshake_alpn_server_no_client() {
+  tsi_test_fixture *fixture = ssl_tsi_test_fixture_create();
+  ssl_tsi_test_fixture *ssl_fixture = (ssl_tsi_test_fixture *)fixture;
+  ssl_fixture->alpn_lib->alpn_mode = ALPN_SERVER_NO_CLIENT;
+  tsi_test_do_handshake(fixture);
+  tsi_test_fixture_destroy(fixture);
+}
+
+void ssl_tsi_test_do_handshake_alpn_client_server_mismatch() {
+  tsi_test_fixture *fixture = ssl_tsi_test_fixture_create();
+  ssl_tsi_test_fixture *ssl_fixture = (ssl_tsi_test_fixture *)fixture;
+  ssl_fixture->alpn_lib->alpn_mode = ALPN_CLIENT_SERVER_MISMATCH;
+  tsi_test_do_handshake(fixture);
+  tsi_test_fixture_destroy(fixture);
+}
+
+void ssl_tsi_test_do_handshake_alpn_client_server_ok() {
+  tsi_test_fixture *fixture = ssl_tsi_test_fixture_create();
+  ssl_tsi_test_fixture *ssl_fixture = (ssl_tsi_test_fixture *)fixture;
+  ssl_fixture->alpn_lib->alpn_mode = ALPN_CLIENT_SERVER_OK;
+  tsi_test_do_handshake(fixture);
+  tsi_test_fixture_destroy(fixture);
+}
+
+void ssl_tsi_test_do_round_trip_for_all_configs() {
+  unsigned int *bit_array =
+      gpr_zalloc(sizeof(unsigned int) * TSI_TEST_NUM_OF_ARGUMENTS);
+  const unsigned int mask = 1U << (TSI_TEST_NUM_OF_ARGUMENTS - 1);
+  for (unsigned int val = 0; val < TSI_TEST_NUM_OF_COMBINATIONS; val++) {
+    unsigned int v = val;
+    for (unsigned int ind = 0; ind < TSI_TEST_NUM_OF_ARGUMENTS; ind++) {
+      bit_array[ind] = (v & mask) ? 1 : 0;
+      v <<= 1;
+    }
+    tsi_test_fixture *fixture = ssl_tsi_test_fixture_create();
+    ssl_tsi_test_fixture *ssl_fixture = (ssl_tsi_test_fixture *)fixture;
+    tsi_test_frame_protector_config_destroy(ssl_fixture->base.config);
+    ssl_fixture->base.config = tsi_test_frame_protector_config_create(
+        bit_array[0], bit_array[1], bit_array[2], bit_array[3], bit_array[4],
+        bit_array[5], bit_array[6], bit_array[7]);
+    tsi_test_do_round_trip(&ssl_fixture->base);
+    tsi_test_fixture_destroy(fixture);
+  }
+  gpr_free(bit_array);
+}
+
+void ssl_tsi_test_do_round_trip_odd_buffer_size() {
+  const size_t odd_sizes[] = {1025, 2051, 4103, 8207, 16409};
+  const size_t size = sizeof(odd_sizes) / sizeof(size_t);
+  for (size_t ind1 = 0; ind1 < size; ind1++) {
+    for (size_t ind2 = 0; ind2 < size; ind2++) {
+      for (size_t ind3 = 0; ind3 < size; ind3++) {
+        for (size_t ind4 = 0; ind4 < size; ind4++) {
+          for (size_t ind5 = 0; ind5 < size; ind5++) {
+            tsi_test_fixture *fixture = ssl_tsi_test_fixture_create();
+            ssl_tsi_test_fixture *ssl_fixture = (ssl_tsi_test_fixture *)fixture;
+            tsi_test_frame_protector_config_set_buffer_size(
+                ssl_fixture->base.config, odd_sizes[ind1], odd_sizes[ind2],
+                odd_sizes[ind3], odd_sizes[ind4], odd_sizes[ind5]);
+            tsi_test_do_round_trip(&ssl_fixture->base);
+            tsi_test_fixture_destroy(fixture);
+          }
+        }
+      }
+    }
+  }
+}
+
+int main(int argc, char **argv) {
+  grpc_test_init(argc, argv);
+  grpc_init();
+  ssl_tsi_test_do_handshake_tiny_handshake_buffer();
+  ssl_tsi_test_do_handshake_small_handshake_buffer();
+  ssl_tsi_test_do_handshake();
+  ssl_tsi_test_do_handshake_with_client_authentication();
+  ssl_tsi_test_do_handshake_with_server_name_indication_exact_domain();
+  ssl_tsi_test_do_handshake_with_server_name_indication_wild_star_domain();
+  ssl_tsi_test_do_handshake_with_bad_server_cert();
+  ssl_tsi_test_do_handshake_with_bad_client_cert();
+  ssl_tsi_test_do_handshake_alpn_client_no_server();
+  ssl_tsi_test_do_handshake_alpn_server_no_client();
+  ssl_tsi_test_do_handshake_alpn_client_server_mismatch();
+  ssl_tsi_test_do_handshake_alpn_client_server_ok();
+  ssl_tsi_test_do_round_trip_for_all_configs();
+  ssl_tsi_test_do_round_trip_odd_buffer_size();
+  grpc_shutdown();
+  return 0;
+}
diff --git a/test/core/tsi/transport_security_test_lib.c b/test/core/tsi/transport_security_test_lib.c
new file mode 100644
index 0000000000..7d66e110f2
--- /dev/null
+++ b/test/core/tsi/transport_security_test_lib.c
@@ -0,0 +1,550 @@
+/*
+ *
+ * Copyright 2017 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 <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <grpc/grpc.h>
+#include <grpc/support/alloc.h>
+#include <grpc/support/log.h>
+#include "src/core/lib/security/transport/tsi_error.h"
+#include "test/core/tsi/transport_security_test_lib.h"
+
+typedef struct handshaker_args {
+  tsi_test_fixture *fixture;
+  unsigned char *handshake_buffer;
+  size_t handshake_buffer_size;
+  bool is_client;
+  bool transferred_data;
+  bool appended_unused_bytes;
+  grpc_error *error;
+} handshaker_args;
+
+static handshaker_args *handshaker_args_create(tsi_test_fixture *fixture,
+                                               bool is_client) {
+  GPR_ASSERT(fixture != NULL);
+  GPR_ASSERT(fixture->config != NULL);
+  handshaker_args *args = gpr_zalloc(sizeof(*args));
+  args->fixture = fixture;
+  args->handshake_buffer_size = fixture->handshake_buffer_size;
+  args->handshake_buffer = gpr_zalloc(args->handshake_buffer_size);
+  args->is_client = is_client;
+  args->error = GRPC_ERROR_NONE;
+  return args;
+}
+
+static void handshaker_args_destroy(handshaker_args *args) {
+  gpr_free(args->handshake_buffer);
+  GRPC_ERROR_UNREF(args->error);
+  gpr_free(args);
+}
+
+static void do_handshaker_next(handshaker_args *args);
+
+static void setup_handshakers(tsi_test_fixture *fixture) {
+  GPR_ASSERT(fixture != NULL);
+  GPR_ASSERT(fixture->vtable != NULL);
+  GPR_ASSERT(fixture->vtable->setup_handshakers != NULL);
+  fixture->vtable->setup_handshakers(fixture);
+}
+
+static void check_unused_bytes(tsi_test_fixture *fixture) {
+  tsi_handshaker_result *result_with_unused_bytes =
+      fixture->has_client_finished_first ? fixture->server_result
+                                         : fixture->client_result;
+  tsi_handshaker_result *result_without_unused_bytes =
+      fixture->has_client_finished_first ? fixture->client_result
+                                         : fixture->server_result;
+  const unsigned char *bytes = NULL;
+  size_t bytes_size = 0;
+  GPR_ASSERT(tsi_handshaker_result_get_unused_bytes(
+                 result_with_unused_bytes, &bytes, &bytes_size) == TSI_OK);
+  GPR_ASSERT(bytes_size == strlen(TSI_TEST_UNUSED_BYTES));
+  GPR_ASSERT(memcmp(bytes, TSI_TEST_UNUSED_BYTES, bytes_size) == 0);
+  GPR_ASSERT(tsi_handshaker_result_get_unused_bytes(
+                 result_without_unused_bytes, &bytes, &bytes_size) == TSI_OK);
+  GPR_ASSERT(bytes_size == 0);
+  GPR_ASSERT(bytes == NULL);
+}
+
+static void check_handshake_results(tsi_test_fixture *fixture) {
+  GPR_ASSERT(fixture != NULL);
+  GPR_ASSERT(fixture->vtable != NULL);
+  GPR_ASSERT(fixture->vtable->check_handshaker_peers != NULL);
+  /* Check handshaker peers. */
+  fixture->vtable->check_handshaker_peers(fixture);
+  /* Check unused bytes. */
+  if (fixture->test_unused_bytes) {
+    if (fixture->server_result != NULL && fixture->client_result != NULL) {
+      check_unused_bytes(fixture);
+    }
+    fixture->bytes_written_to_server_channel = 0;
+    fixture->bytes_written_to_client_channel = 0;
+    fixture->bytes_read_from_client_channel = 0;
+    fixture->bytes_read_from_server_channel = 0;
+  }
+}
+
+static void send_bytes_to_peer(tsi_test_fixture *fixture,
+                               const unsigned char *buf, size_t buf_size,
+                               bool is_client) {
+  GPR_ASSERT(fixture != NULL);
+  GPR_ASSERT(buf != NULL);
+  uint8_t *channel =
+      is_client ? fixture->server_channel : fixture->client_channel;
+  GPR_ASSERT(channel != NULL);
+  size_t *bytes_written = is_client ? &fixture->bytes_written_to_server_channel
+                                    : &fixture->bytes_written_to_client_channel;
+  GPR_ASSERT(bytes_written != NULL);
+  GPR_ASSERT(*bytes_written + buf_size <= TSI_TEST_DEFAULT_CHANNEL_SIZE);
+  /* Write data to channel. */
+  memcpy(channel + *bytes_written, buf, buf_size);
+  *bytes_written += buf_size;
+}
+
+static void maybe_append_unused_bytes(handshaker_args *args) {
+  GPR_ASSERT(args != NULL);
+  GPR_ASSERT(args->fixture != NULL);
+  tsi_test_fixture *fixture = args->fixture;
+  if (fixture->test_unused_bytes && !args->appended_unused_bytes) {
+    args->appended_unused_bytes = true;
+    send_bytes_to_peer(fixture, (const unsigned char *)TSI_TEST_UNUSED_BYTES,
+                       strlen(TSI_TEST_UNUSED_BYTES), args->is_client);
+    if (fixture->client_result != NULL && fixture->server_result == NULL) {
+      fixture->has_client_finished_first = true;
+    }
+  }
+}
+
+static void receive_bytes_from_peer(tsi_test_fixture *fixture,
+                                    unsigned char **buf, size_t *buf_size,
+                                    bool is_client) {
+  GPR_ASSERT(fixture != NULL);
+  GPR_ASSERT(*buf != NULL);
+  GPR_ASSERT(buf_size != NULL);
+  uint8_t *channel =
+      is_client ? fixture->client_channel : fixture->server_channel;
+  GPR_ASSERT(channel != NULL);
+  size_t *bytes_read = is_client ? &fixture->bytes_read_from_client_channel
+                                 : &fixture->bytes_read_from_server_channel;
+  size_t *bytes_written = is_client ? &fixture->bytes_written_to_client_channel
+                                    : &fixture->bytes_written_to_server_channel;
+  GPR_ASSERT(bytes_read != NULL);
+  GPR_ASSERT(bytes_written != NULL);
+  size_t to_read = *buf_size < *bytes_written - *bytes_read
+                       ? *buf_size
+                       : *bytes_written - *bytes_read;
+  /* Read data from channel. */
+  memcpy(*buf, channel + *bytes_read, to_read);
+  *buf_size = to_read;
+  *bytes_read += to_read;
+}
+
+static void send_message_to_peer(tsi_test_fixture *fixture,
+                                 tsi_frame_protector *protector,
+                                 bool is_client) {
+  /* Initialization. */
+  GPR_ASSERT(fixture != NULL);
+  GPR_ASSERT(fixture->config != NULL);
+  GPR_ASSERT(protector != NULL);
+  tsi_test_frame_protector_config *config = fixture->config;
+  unsigned char *protected_buffer = gpr_zalloc(config->protected_buffer_size);
+  size_t message_size =
+      is_client ? config->client_message_size : config->server_message_size;
+  uint8_t *message =
+      is_client ? config->client_message : config->server_message;
+  GPR_ASSERT(message != NULL);
+  const unsigned char *message_bytes = (const unsigned char *)message;
+  tsi_result result = TSI_OK;
+  /* Do protect and send protected data to peer. */
+  while (message_size > 0 && result == TSI_OK) {
+    size_t protected_buffer_size_to_send = config->protected_buffer_size;
+    size_t processed_message_size = message_size;
+    /* Do protect. */
+    result = tsi_frame_protector_protect(
+        protector, message_bytes, &processed_message_size, protected_buffer,
+        &protected_buffer_size_to_send);
+    GPR_ASSERT(result == TSI_OK);
+    /* Send protected data to peer. */
+    send_bytes_to_peer(fixture, protected_buffer, protected_buffer_size_to_send,
+                       is_client);
+    message_bytes += processed_message_size;
+    message_size -= processed_message_size;
+    /* Flush if we're done. */
+    if (message_size == 0) {
+      size_t still_pending_size;
+      do {
+        protected_buffer_size_to_send = config->protected_buffer_size;
+        result = tsi_frame_protector_protect_flush(
+            protector, protected_buffer, &protected_buffer_size_to_send,
+            &still_pending_size);
+        GPR_ASSERT(result == TSI_OK);
+        send_bytes_to_peer(fixture, protected_buffer,
+                           protected_buffer_size_to_send, is_client);
+      } while (still_pending_size > 0 && result == TSI_OK);
+      GPR_ASSERT(result == TSI_OK);
+    }
+  }
+  GPR_ASSERT(result == TSI_OK);
+  gpr_free(protected_buffer);
+}
+
+static void receive_message_from_peer(tsi_test_fixture *fixture,
+                                      tsi_frame_protector *protector,
+                                      unsigned char *message,
+                                      size_t *bytes_received, bool is_client) {
+  /* Initialization. */
+  GPR_ASSERT(fixture != NULL);
+  GPR_ASSERT(protector != NULL);
+  GPR_ASSERT(message != NULL);
+  GPR_ASSERT(bytes_received != NULL);
+  GPR_ASSERT(fixture->config != NULL);
+  tsi_test_frame_protector_config *config = fixture->config;
+  size_t read_offset = 0;
+  size_t message_offset = 0;
+  size_t read_from_peer_size = 0;
+  tsi_result result = TSI_OK;
+  bool done = false;
+  unsigned char *read_buffer = gpr_zalloc(config->read_buffer_allocated_size);
+  unsigned char *message_buffer =
+      gpr_zalloc(config->message_buffer_allocated_size);
+  /* Do unprotect on data received from peer. */
+  while (!done && result == TSI_OK) {
+    /* Receive data from peer. */
+    if (read_from_peer_size == 0) {
+      read_from_peer_size = config->read_buffer_allocated_size;
+      receive_bytes_from_peer(fixture, &read_buffer, &read_from_peer_size,
+                              is_client);
+      read_offset = 0;
+    }
+    if (read_from_peer_size == 0) {
+      done = true;
+    }
+    /* Do unprotect. */
+    size_t message_buffer_size;
+    do {
+      message_buffer_size = config->message_buffer_allocated_size;
+      size_t processed_size = read_from_peer_size;
+      result = tsi_frame_protector_unprotect(
+          protector, read_buffer + read_offset, &processed_size, message_buffer,
+          &message_buffer_size);
+      GPR_ASSERT(result == TSI_OK);
+      if (message_buffer_size > 0) {
+        memcpy(message + message_offset, message_buffer, message_buffer_size);
+        message_offset += message_buffer_size;
+      }
+      read_offset += processed_size;
+      read_from_peer_size -= processed_size;
+    } while ((read_from_peer_size > 0 || message_buffer_size > 0) &&
+             result == TSI_OK);
+    GPR_ASSERT(result == TSI_OK);
+  }
+  GPR_ASSERT(result == TSI_OK);
+  *bytes_received = message_offset;
+  gpr_free(read_buffer);
+  gpr_free(message_buffer);
+}
+
+grpc_error *on_handshake_next_done(tsi_result result, void *user_data,
+                                   const unsigned char *bytes_to_send,
+                                   size_t bytes_to_send_size,
+                                   tsi_handshaker_result *handshaker_result) {
+  handshaker_args *args = (handshaker_args *)user_data;
+  GPR_ASSERT(args != NULL);
+  GPR_ASSERT(args->fixture != NULL);
+  tsi_test_fixture *fixture = args->fixture;
+  grpc_error *error = GRPC_ERROR_NONE;
+  /* Read more data if we need to. */
+  if (result == TSI_INCOMPLETE_DATA) {
+    GPR_ASSERT(bytes_to_send_size == 0);
+    return error;
+  }
+  if (result != TSI_OK) {
+    return grpc_set_tsi_error_result(
+        GRPC_ERROR_CREATE_FROM_STATIC_STRING("Handshake failed"), result);
+  }
+  /* Update handshaker result. */
+  if (handshaker_result != NULL) {
+    tsi_handshaker_result **result_to_write =
+        args->is_client ? &fixture->client_result : &fixture->server_result;
+    GPR_ASSERT(*result_to_write == NULL);
+    *result_to_write = handshaker_result;
+  }
+  /* Send data to peer, if needed. */
+  if (bytes_to_send_size > 0) {
+    send_bytes_to_peer(args->fixture, bytes_to_send, bytes_to_send_size,
+                       args->is_client);
+    args->transferred_data = true;
+  }
+  if (handshaker_result != NULL) {
+    maybe_append_unused_bytes(args);
+  }
+  return error;
+}
+
+static void on_handshake_next_done_wrapper(
+    tsi_result result, void *user_data, const unsigned char *bytes_to_send,
+    size_t bytes_to_send_size, tsi_handshaker_result *handshaker_result) {
+  handshaker_args *args = (handshaker_args *)user_data;
+  args->error = on_handshake_next_done(result, user_data, bytes_to_send,
+                                       bytes_to_send_size, handshaker_result);
+}
+
+static bool is_handshake_finished_properly(handshaker_args *args) {
+  GPR_ASSERT(args != NULL);
+  GPR_ASSERT(args->fixture != NULL);
+  tsi_test_fixture *fixture = args->fixture;
+  if ((args->is_client && fixture->client_result != NULL) ||
+      (!args->is_client && fixture->server_result != NULL)) {
+    return true;
+  }
+  return false;
+}
+
+static void do_handshaker_next(handshaker_args *args) {
+  /* Initialization. */
+  GPR_ASSERT(args != NULL);
+  GPR_ASSERT(args->fixture != NULL);
+  tsi_test_fixture *fixture = args->fixture;
+  tsi_handshaker *handshaker =
+      args->is_client ? fixture->client_handshaker : fixture->server_handshaker;
+  if (is_handshake_finished_properly(args)) {
+    return;
+  }
+  tsi_handshaker_result *handshaker_result = NULL;
+  unsigned char *bytes_to_send = NULL;
+  size_t bytes_to_send_size = 0;
+  /* Receive data from peer, if available. */
+  size_t buf_size = args->handshake_buffer_size;
+  receive_bytes_from_peer(args->fixture, &args->handshake_buffer, &buf_size,
+                          args->is_client);
+  if (buf_size > 0) {
+    args->transferred_data = true;
+  }
+  /* Peform handshaker next. */
+  tsi_result result = tsi_handshaker_next(
+      handshaker, args->handshake_buffer, buf_size,
+      (const unsigned char **)&bytes_to_send, &bytes_to_send_size,
+      &handshaker_result, &on_handshake_next_done_wrapper, args);
+  if (result != TSI_ASYNC) {
+    args->error = on_handshake_next_done(result, args, bytes_to_send,
+                                         bytes_to_send_size, handshaker_result);
+  }
+}
+
+void tsi_test_do_handshake(tsi_test_fixture *fixture) {
+  /* Initializaiton. */
+  setup_handshakers(fixture);
+  handshaker_args *client_args =
+      handshaker_args_create(fixture, true /* is_client */);
+  handshaker_args *server_args =
+      handshaker_args_create(fixture, false /* is_client */);
+  /* Do handshake. */
+  do {
+    client_args->transferred_data = false;
+    server_args->transferred_data = false;
+    do_handshaker_next(client_args);
+    if (client_args->error != GRPC_ERROR_NONE) {
+      break;
+    }
+    do_handshaker_next(server_args);
+    if (server_args->error != GRPC_ERROR_NONE) {
+      break;
+    }
+    GPR_ASSERT(client_args->transferred_data || server_args->transferred_data);
+  } while (fixture->client_result == NULL || fixture->server_result == NULL);
+  /* Verify handshake results. */
+  check_handshake_results(fixture);
+  /* Cleanup. */
+  handshaker_args_destroy(client_args);
+  handshaker_args_destroy(server_args);
+}
+
+void tsi_test_do_round_trip(tsi_test_fixture *fixture) {
+  /* Initialization. */
+  GPR_ASSERT(fixture != NULL);
+  GPR_ASSERT(fixture->config != NULL);
+  tsi_test_frame_protector_config *config = fixture->config;
+  tsi_frame_protector *client_frame_protector = NULL;
+  tsi_frame_protector *server_frame_protector = NULL;
+  /* Perform handshake. */
+  tsi_test_do_handshake(fixture);
+  /* Create frame protectors.*/
+  size_t client_max_output_protected_frame_size =
+      config->client_max_output_protected_frame_size;
+  GPR_ASSERT(tsi_handshaker_result_create_frame_protector(
+                 fixture->client_result,
+                 client_max_output_protected_frame_size == 0
+                     ? NULL
+                     : &client_max_output_protected_frame_size,
+                 &client_frame_protector) == TSI_OK);
+  size_t server_max_output_protected_frame_size =
+      config->server_max_output_protected_frame_size;
+  GPR_ASSERT(tsi_handshaker_result_create_frame_protector(
+                 fixture->server_result,
+                 server_max_output_protected_frame_size == 0
+                     ? NULL
+                     : &server_max_output_protected_frame_size,
+                 &server_frame_protector) == TSI_OK);
+  /* Client sends a message to server. */
+  send_message_to_peer(fixture, client_frame_protector, true /* is_client */);
+  unsigned char *server_received_message =
+      gpr_zalloc(TSI_TEST_DEFAULT_CHANNEL_SIZE);
+  size_t server_received_message_size = 0;
+  receive_message_from_peer(
+      fixture, server_frame_protector, server_received_message,
+      &server_received_message_size, false /* is_client */);
+  GPR_ASSERT(config->client_message_size == server_received_message_size);
+  GPR_ASSERT(memcmp(config->client_message, server_received_message,
+                    server_received_message_size) == 0);
+  /* Server sends a message to client. */
+  send_message_to_peer(fixture, server_frame_protector, false /* is_client */);
+  unsigned char *client_received_message =
+      gpr_zalloc(TSI_TEST_DEFAULT_CHANNEL_SIZE);
+  size_t client_received_message_size = 0;
+  receive_message_from_peer(
+      fixture, client_frame_protector, client_received_message,
+      &client_received_message_size, true /* is_client */);
+  GPR_ASSERT(config->server_message_size == client_received_message_size);
+  GPR_ASSERT(memcmp(config->server_message, client_received_message,
+                    client_received_message_size) == 0);
+  /* Destroy server and client frame protectors. */
+  tsi_frame_protector_destroy(client_frame_protector);
+  tsi_frame_protector_destroy(server_frame_protector);
+  gpr_free(server_received_message);
+  gpr_free(client_received_message);
+}
+
+static unsigned char *generate_random_message(size_t size) {
+  size_t i;
+  unsigned char chars[] = "abcdefghijklmnopqrstuvwxyz1234567890";
+  unsigned char *output = gpr_zalloc(sizeof(unsigned char) * size);
+  for (i = 0; i < size - 1; ++i) {
+    output[i] = chars[rand() % (int)(sizeof(chars) - 1)];
+  }
+  return output;
+}
+
+tsi_test_frame_protector_config *tsi_test_frame_protector_config_create(
+    bool use_default_read_buffer_allocated_size,
+    bool use_default_message_buffer_allocated_size,
+    bool use_default_protected_buffer_size, bool use_default_client_message,
+    bool use_default_server_message,
+    bool use_default_client_max_output_protected_frame_size,
+    bool use_default_server_max_output_protected_frame_size,
+    bool use_default_handshake_buffer_size) {
+  tsi_test_frame_protector_config *config = gpr_zalloc(sizeof(*config));
+  /* Set the value for read_buffer_allocated_size. */
+  config->read_buffer_allocated_size =
+      use_default_read_buffer_allocated_size
+          ? TSI_TEST_DEFAULT_BUFFER_SIZE
+          : TSI_TEST_SMALL_READ_BUFFER_ALLOCATED_SIZE;
+  /* Set the value for message_buffer_allocated_size. */
+  config->message_buffer_allocated_size =
+      use_default_message_buffer_allocated_size
+          ? TSI_TEST_DEFAULT_BUFFER_SIZE
+          : TSI_TEST_SMALL_MESSAGE_BUFFER_ALLOCATED_SIZE;
+  /* Set the value for protected_buffer_size. */
+  config->protected_buffer_size = use_default_protected_buffer_size
+                                      ? TSI_TEST_DEFAULT_PROTECTED_BUFFER_SIZE
+                                      : TSI_TEST_SMALL_PROTECTED_BUFFER_SIZE;
+  /* Set the value for client message. */
+  config->client_message_size = use_default_client_message
+                                    ? TSI_TEST_BIG_MESSAGE_SIZE
+                                    : TSI_TEST_SMALL_MESSAGE_SIZE;
+  config->client_message =
+      use_default_client_message
+          ? generate_random_message(TSI_TEST_BIG_MESSAGE_SIZE)
+          : generate_random_message(TSI_TEST_SMALL_MESSAGE_SIZE);
+  /* Set the value for server message. */
+  config->server_message_size = use_default_server_message
+                                    ? TSI_TEST_BIG_MESSAGE_SIZE
+                                    : TSI_TEST_SMALL_MESSAGE_SIZE;
+  config->server_message =
+      use_default_server_message
+          ? generate_random_message(TSI_TEST_BIG_MESSAGE_SIZE)
+          : generate_random_message(TSI_TEST_SMALL_MESSAGE_SIZE);
+  /* Set the value for client max_output_protected_frame_size.
+     If it is 0, we pass NULL to tsi_handshaker_result_create_frame_protector(),
+     which then uses default protected frame size for it. */
+  config->client_max_output_protected_frame_size =
+      use_default_client_max_output_protected_frame_size
+          ? 0
+          : TSI_TEST_SMALL_CLIENT_MAX_OUTPUT_PROTECTED_FRAME_SIZE;
+  /* Set the value for server max_output_protected_frame_size.
+     If it is 0, we pass NULL to tsi_handshaker_result_create_frame_protector(),
+     which then uses default protected frame size for it. */
+  config->server_max_output_protected_frame_size =
+      use_default_server_max_output_protected_frame_size
+          ? 0
+          : TSI_TEST_SMALL_SERVER_MAX_OUTPUT_PROTECTED_FRAME_SIZE;
+  return config;
+}
+
+void tsi_test_frame_protector_config_set_buffer_size(
+    tsi_test_frame_protector_config *config, size_t read_buffer_allocated_size,
+    size_t message_buffer_allocated_size, size_t protected_buffer_size,
+    size_t client_max_output_protected_frame_size,
+    size_t server_max_output_protected_frame_size) {
+  GPR_ASSERT(config != NULL);
+  config->read_buffer_allocated_size = read_buffer_allocated_size;
+  config->message_buffer_allocated_size = message_buffer_allocated_size;
+  config->protected_buffer_size = protected_buffer_size;
+  config->client_max_output_protected_frame_size =
+      client_max_output_protected_frame_size;
+  config->server_max_output_protected_frame_size =
+      server_max_output_protected_frame_size;
+}
+
+void tsi_test_frame_protector_config_destroy(
+    tsi_test_frame_protector_config *config) {
+  GPR_ASSERT(config != NULL);
+  gpr_free(config->client_message);
+  gpr_free(config->server_message);
+  gpr_free(config);
+}
+
+void tsi_test_fixture_init(tsi_test_fixture *fixture) {
+  fixture->config = tsi_test_frame_protector_config_create(
+      true, true, true, true, true, true, true, true);
+  fixture->handshake_buffer_size = TSI_TEST_DEFAULT_BUFFER_SIZE;
+  fixture->client_channel = gpr_zalloc(TSI_TEST_DEFAULT_CHANNEL_SIZE);
+  fixture->server_channel = gpr_zalloc(TSI_TEST_DEFAULT_CHANNEL_SIZE);
+  fixture->bytes_written_to_client_channel = 0;
+  fixture->bytes_written_to_server_channel = 0;
+  fixture->bytes_read_from_client_channel = 0;
+  fixture->bytes_read_from_server_channel = 0;
+  fixture->test_unused_bytes = true;
+  fixture->has_client_finished_first = false;
+}
+
+void tsi_test_fixture_destroy(tsi_test_fixture *fixture) {
+  GPR_ASSERT(fixture != NULL);
+  tsi_test_frame_protector_config_destroy(fixture->config);
+  tsi_handshaker_destroy(fixture->client_handshaker);
+  tsi_handshaker_destroy(fixture->server_handshaker);
+  tsi_handshaker_result_destroy(fixture->client_result);
+  tsi_handshaker_result_destroy(fixture->server_result);
+  gpr_free(fixture->client_channel);
+  gpr_free(fixture->server_channel);
+  GPR_ASSERT(fixture->vtable != NULL);
+  GPR_ASSERT(fixture->vtable->destruct != NULL);
+  fixture->vtable->destruct(fixture);
+  gpr_free(fixture);
+}
diff --git a/test/core/tsi/transport_security_test_lib.h b/test/core/tsi/transport_security_test_lib.h
new file mode 100644
index 0000000000..8ae2024ee4
--- /dev/null
+++ b/test/core/tsi/transport_security_test_lib.h
@@ -0,0 +1,165 @@
+/*
+ *
+ * Copyright 2017 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_TSI_TRANSPORT_SECURITY_TEST_LIB_H_
+#define GRPC_TEST_CORE_TSI_TRANSPORT_SECURITY_TEST_LIB_H_
+
+#include "src/core/tsi/transport_security_interface.h"
+
+#define TSI_TEST_TINY_HANDSHAKE_BUFFER_SIZE 32
+#define TSI_TEST_SMALL_HANDSHAKE_BUFFER_SIZE 128
+#define TSI_TEST_SMALL_READ_BUFFER_ALLOCATED_SIZE 41
+#define TSI_TEST_SMALL_PROTECTED_BUFFER_SIZE 37
+#define TSI_TEST_SMALL_MESSAGE_BUFFER_ALLOCATED_SIZE 42
+#define TSI_TEST_SMALL_CLIENT_MAX_OUTPUT_PROTECTED_FRAME_SIZE 39
+#define TSI_TEST_SMALL_SERVER_MAX_OUTPUT_PROTECTED_FRAME_SIZE 43
+#define TSI_TEST_DEFAULT_BUFFER_SIZE 4096
+#define TSI_TEST_DEFAULT_PROTECTED_BUFFER_SIZE 16384
+#define TSI_TEST_DEFAULT_CHANNEL_SIZE 32768
+#define TSI_TEST_BIG_MESSAGE_SIZE 17000
+#define TSI_TEST_SMALL_MESSAGE_SIZE 10
+#define TSI_TEST_NUM_OF_ARGUMENTS 8
+#define TSI_TEST_NUM_OF_COMBINATIONS 256
+#define TSI_TEST_UNUSED_BYTES "HELLO GOOGLE"
+
+/* ---  tsi_test_fixture object ---
+  The tests for specific TSI implementations should create their own
+  custom "subclass" of this fixture, which wraps all information
+  that will be used to test correctness of TSI handshakes and frame
+  protect/unprotect operations with respect to TSI implementations. */
+typedef struct tsi_test_fixture tsi_test_fixture;
+
+/* ---  tsi_test_frame_protector_config object ---
+
+  This object is used to configure different parameters of TSI frame protector
+  APIs. */
+typedef struct tsi_test_frame_protector_config tsi_test_frame_protector_config;
+
+/* V-table for tsi_test_fixture operations that are implemented differently in
+   different TSI implementations. */
+typedef struct tsi_test_fixture_vtable {
+  void (*setup_handshakers)(tsi_test_fixture *fixture);
+  void (*check_handshaker_peers)(tsi_test_fixture *fixture);
+  void (*destruct)(tsi_test_fixture *fixture);
+} tranport_security_test_vtable;
+
+struct tsi_test_fixture {
+  const struct tsi_test_fixture_vtable *vtable;
+  /* client/server TSI handshaker used to perform TSI handshakes, and will get
+     instantiated during the call to setup_handshakers. */
+  tsi_handshaker *client_handshaker;
+  tsi_handshaker *server_handshaker;
+  /* client/server TSI handshaker results used to store the result of TSI
+     handshake. If the handshake fails, the result will store NULL upon
+     finishing the handshake. */
+  tsi_handshaker_result *client_result;
+  tsi_handshaker_result *server_result;
+  /* size of buffer used to store data received from the peer. */
+  size_t handshake_buffer_size;
+  /* simulated channels between client and server. If the server (client)
+     wants to send data to the client (server), he will write data to
+     client_channel (server_channel), which will be read by client (server). */
+  uint8_t *client_channel;
+  uint8_t *server_channel;
+  /* size of data written to the client/server channel. */
+  size_t bytes_written_to_client_channel;
+  size_t bytes_written_to_server_channel;
+  /* size of data read from the client/server channel */
+  size_t bytes_read_from_client_channel;
+  size_t bytes_read_from_server_channel;
+  /* tsi_test_frame_protector_config instance */
+  tsi_test_frame_protector_config *config;
+  /* a flag indicating if client has finished TSI handshake first (i.e., before
+     server).
+     The flag should be referred if and only if TSI handshake finishes
+     successfully. */
+  bool has_client_finished_first;
+  /* a flag indicating whether to test tsi_handshaker_result_get_unused_bytes()
+     for TSI implementation. This field is true by default, and false
+     for SSL TSI implementation due to grpc issue #12164
+     (https://github.com/grpc/grpc/issues/12164).
+  */
+  bool test_unused_bytes;
+};
+
+struct tsi_test_frame_protector_config {
+  /* size of buffer used to store protected frames to be unprotected. */
+  size_t read_buffer_allocated_size;
+  /* size of buffer used to store bytes resulted from unprotect operations. */
+  size_t message_buffer_allocated_size;
+  /* size of buffer used to store frames resulted from protect operations. */
+  size_t protected_buffer_size;
+  /* size of client/server maximum frame size. */
+  size_t client_max_output_protected_frame_size;
+  size_t server_max_output_protected_frame_size;
+  /* pointer that points to client/server message to be protected. */
+  uint8_t *client_message;
+  uint8_t *server_message;
+  /* size of client/server message. */
+  size_t client_message_size;
+  size_t server_message_size;
+};
+
+/* This method creates a tsi_test_frame_protector_config instance. Each
+   parameter of this function is a boolean value indicating whether to set the
+   corresponding parameter with a default value or not. If it's false, it will
+   be set with a specific value which is usually much smaller than the default.
+   Both values are defined with #define directive. */
+tsi_test_frame_protector_config *tsi_test_frame_protector_config_create(
+    bool use_default_read_buffer_allocated_size,
+    bool use_default_message_buffer_allocated_size,
+    bool use_default_protected_buffer_size, bool use_default_client_message,
+    bool use_default_server_message,
+    bool use_default_client_max_output_protected_frame_size,
+    bool use_default_server_max_output_protected_frame_size,
+    bool use_default_handshake_buffer_size);
+
+/* This method sets different buffer and frame sizes of a
+   tsi_test_frame_protector_config instance with user provided values. */
+void tsi_test_frame_protector_config_set_buffer_size(
+    tsi_test_frame_protector_config *config, size_t read_buffer_allocated_size,
+    size_t message_buffer_allocated_size, size_t protected_buffer_size,
+    size_t client_max_output_protected_frame_size,
+    size_t server_max_output_protected_frame_size);
+
+/* This method destroys a tsi_test_frame_protector_config instance. */
+void tsi_test_frame_protector_config_destroy(
+    tsi_test_frame_protector_config *config);
+
+/* This method initializes members of tsi_test_fixture instance.
+   Note that the struct instance should be allocated before making
+   this call. */
+void tsi_test_fixture_init(tsi_test_fixture *fixture);
+
+/* This method destroys a tsi_test_fixture instance. Note that the
+   fixture intance must be dynamically allocated and will be freed by
+   this function. */
+void tsi_test_fixture_destroy(tsi_test_fixture *fixture);
+
+/* This method performs a full TSI handshake between a client and a server.
+   Note that the test library will implement the new TSI handshaker API to
+   perform handshakes. */
+void tsi_test_do_handshake(tsi_test_fixture *fixture);
+
+/* This method performs a round trip test between the client and the server.
+   That is, the client sends a protected message to a server who receives the
+   message, and unprotects it. The same operation is triggered again with
+   the client and server switching its role. */
+void tsi_test_do_round_trip(tsi_test_fixture *fixture);
+
+#endif  // GRPC_TEST_CORE_TSI_TRANSPORT_SECURITY_TEST_LIB_H_