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diff --git a/sha1_test.c b/sha1_test.c
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+/*********************************************************************
+* Filename:   sha1_test.c
+* Author:     Brad Conte (brad AT bradconte.com)
+* Copyright:
+* Disclaimer: This code is presented "as is" without any guarantees.
+* Details:    Performs known-answer tests on the corresponding SHA1
+	          implementation. These tests do not encompass the full
+	          range of available test vectors, however, if the tests
+	          pass it is very, very likely that the code is correct
+	          and was compiled properly. This code also serves as
+	          example usage of the functions.
+*********************************************************************/
+
+/*************************** HEADER FILES ***************************/
+#include <stdio.h>
+#include <memory.h>
+#include <string.h>
+#include "sha1.h"
+
+/*********************** FUNCTION DEFINITIONS ***********************/
+int sha1_test()
+{
+	BYTE text1[] = {"abc"};
+	BYTE text2[] = {"abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq"};
+	BYTE text3[] = {"aaaaaaaaaa"};
+	BYTE hash1[SHA1_BLOCK_SIZE] = {0xa9,0x99,0x3e,0x36,0x47,0x06,0x81,0x6a,0xba,0x3e,0x25,0x71,0x78,0x50,0xc2,0x6c,0x9c,0xd0,0xd8,0x9d};
+	BYTE hash2[SHA1_BLOCK_SIZE] = {0x84,0x98,0x3e,0x44,0x1c,0x3b,0xd2,0x6e,0xba,0xae,0x4a,0xa1,0xf9,0x51,0x29,0xe5,0xe5,0x46,0x70,0xf1};
+	BYTE hash3[SHA1_BLOCK_SIZE] = {0x34,0xaa,0x97,0x3c,0xd4,0xc4,0xda,0xa4,0xf6,0x1e,0xeb,0x2b,0xdb,0xad,0x27,0x31,0x65,0x34,0x01,0x6f};
+	BYTE buf[SHA1_BLOCK_SIZE];
+	int idx;
+	SHA1_CTX ctx;
+	int pass = 1;
+
+	sha1_init(&ctx);
+	sha1_update(&ctx, text1, strlen(text1));
+	sha1_final(&ctx, buf);
+	pass = pass && !memcmp(hash1, buf, SHA1_BLOCK_SIZE);
+
+	sha1_init(&ctx);
+	sha1_update(&ctx, text2, strlen(text2));
+	sha1_final(&ctx, buf);
+	pass = pass && !memcmp(hash2, buf, SHA1_BLOCK_SIZE);
+
+	sha1_init(&ctx);
+	for (idx = 0; idx < 100000; ++idx)
+	   sha1_update(&ctx, text3, strlen(text3));
+	sha1_final(&ctx, buf);
+	pass = pass && !memcmp(hash3, buf, SHA1_BLOCK_SIZE);
+
+	return(pass);
+}
+
+int main()
+{
+	printf("SHA1 tests: %s\n", sha1_test() ? "SUCCEEDED" : "FAILED");
+
+	return(0);
+}