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diff --git a/test/test-sha256.c b/test/test-sha256.c
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+/*********************************************************************
+* Filename:   sha256.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 "sha256.h"
+
+/*********************** FUNCTION DEFINITIONS ***********************/
+int sha256_test()
+{
+	BYTE text1[] = {"abc"};
+	BYTE text2[] = {"abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq"};
+	BYTE text3[] = {"aaaaaaaaaa"};
+	BYTE hash1[SHA256_BLOCK_SIZE] = {
+		0xba, 0x78, 0x16, 0xbf, 0x8f, 0x01, 0xcf, 0xea,
+		0x41, 0x41, 0x40, 0xde, 0x5d, 0xae, 0x22, 0x23,
+		0xb0, 0x03, 0x61, 0xa3, 0x96, 0x17, 0x7a, 0x9c,
+		0xb4, 0x10, 0xff, 0x61, 0xf2, 0x00, 0x15, 0xad
+	};
+	BYTE hash2[SHA256_BLOCK_SIZE] = {
+		0x24, 0x8d, 0x6a, 0x61, 0xd2, 0x06, 0x38, 0xb8,
+		0xe5, 0xc0, 0x26, 0x93, 0x0c, 0x3e, 0x60, 0x39,
+		0xa3, 0x3c, 0xe4, 0x59, 0x64, 0xff, 0x21, 0x67,
+		0xf6, 0xec, 0xed, 0xd4, 0x19, 0xdb, 0x06, 0xc1
+	};
+	BYTE hash3[SHA256_BLOCK_SIZE] = {
+		0xcd, 0xc7, 0x6e, 0x5c, 0x99, 0x14, 0xfb, 0x92,
+		0x81, 0xa1, 0xc7, 0xe2, 0x84, 0xd7, 0x3e, 0x67,
+		0xf1, 0x80, 0x9a, 0x48, 0xa4, 0x97, 0x20, 0x0e,
+		0x04, 0x6d, 0x39, 0xcc, 0xc7, 0x11, 0x2c, 0xd0
+	};
+	BYTE buf[SHA256_BLOCK_SIZE];
+	SHA256_CTX ctx;
+	int idx;
+	int pass = 1;
+
+	sha256_init(&ctx);
+	sha256_update(&ctx, text1, strlen((const char *)text1));
+	sha256_final(&ctx, buf);
+	pass = pass && !memcmp(hash1, buf, SHA256_BLOCK_SIZE);
+
+	sha256_init(&ctx);
+	sha256_update(&ctx, text2, strlen((const char *)text2));
+	sha256_final(&ctx, buf);
+	pass = pass && !memcmp(hash2, buf, SHA256_BLOCK_SIZE);
+
+	sha256_init(&ctx);
+	for (idx = 0; idx < 100000; ++idx) {
+		sha256_update(&ctx, text3, strlen((const char *)text3));
+	}
+	sha256_final(&ctx, buf);
+	pass = pass && !memcmp(hash3, buf, SHA256_BLOCK_SIZE);
+
+	return pass;
+}
+
+int main()
+{
+	int result = sha256_test();
+	printf("%s: SHA-256\n", result ? "PASS" : "FAIL");
+
+	return result ? 0 : 1;
+}