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diff --git a/test/core/tsi/alts/crypt/gsec_test_util.h b/test/core/tsi/alts/crypt/gsec_test_util.h
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+/*
+ *
+ * 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_TSI_ALTS_CRYPT_GSEC_TEST_UTIL_H_
+#define GRPC_TEST_CORE_TSI_ALTS_CRYPT_GSEC_TEST_UTIL_H_
+
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <grpc/grpc.h>
+
+/**
+ * This method returns random bytes of certain length.
+ *
+ * - bytes: buffer to hold random bytes.
+ * - length: length of buffer to be populated.
+ */
+void gsec_test_random_bytes(uint8_t* bytes, size_t length);
+
+/**
+ * This method returns an array of random bytes.
+ *
+ * - bytes: array to hold random bytes.
+ * - length: length of array to be populated.
+ */
+void gsec_test_random_array(uint8_t** bytes, size_t length);
+
+/**
+ * This method returns a uint32 that's not quite uniformly random, but good
+ * enough for tests.
+ *
+ * - max_length: a max value the returned random number can choose.
+ */
+uint32_t gsec_test_bias_random_uint32(uint32_t max_length);
+
+/**
+ * This method copies data from a source to a destination buffer.
+ *
+ * - src: a source buffer.
+ * - des: a destination buffer.
+ * - length: the length of source buffer to be copied from its beginning.
+ */
+void gsec_test_copy(const uint8_t* src, uint8_t** des, size_t length);
+
+/**
+ * This method copies data from a source to a destination buffer, and flips one
+ * byte in the destination buffer randomly.
+ *
+ * - src: a source buffer.
+ * - des: a destination buffer.
+ * - length: the length of source buffer to be copied from its beginning.
+ */
+void gsec_test_copy_and_alter_random_byte(const uint8_t* src, uint8_t** des,
+                                          size_t source_len);
+
+/**
+ * This method compares two grpc_status_code values, and verifies if one string
+ * is a substring of the other.
+ *
+ * - status1: the first grpc_status_code to be compared.
+ * - status2: the second grpc_status_code to be compared.
+ * - msg1: a string to be scanned.
+ * - msg2: a small string to be searched within msg1.
+ *
+ * If both checks succeed, the method returns 1 and otherwise, it returns 0.
+ */
+int gsec_test_expect_compare_code_and_substr(grpc_status_code status1,
+                                             grpc_status_code status2,
+                                             const char* msg1,
+                                             const char* msg2);
+
+#endif  // GRPC_TEST_CORE_TSI_ALTS_CRYPT_GSEC_TEST_UTIL_H_ */