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diff --git a/tests/test_sha256.c b/tests/test_sha256.c
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+
+/*
+ *  Copyright (C) 2015 by Intel Corporation, All Rights Reserved.
+ * 
+ *  Redistribution and use in source and binary forms, with or without
+ *  modification, are permitted provided that the following conditions are met:
+ *
+ *    - Redistributions of source code must retain the above copyright notice,
+ *     this list of conditions and the following disclaimer.
+ *
+ *    - Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ *    - Neither the name of Intel Corporation nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ *  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ *  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ *  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
+ *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ *  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ *  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ *  CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ *  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *  test_sha256.c - Implementation of some SHA-256 tests (including NIST tests).
+ *
+ */
+#include "sha256.h"
+#include "test_utils.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdint.h>
+
+/*
+ * NIST SHA256 test vector 1.
+ */
+void test_1 (void) {
+  printf ("\tPerforming SHA256 test #1...");
+  const uint8_t expected[32] = {
+    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
+  };
+  const char *m = "abc";
+  uint8_t digest[32];
+  struct sha256_state_struct s;
+
+  (void) sha256_init (&s);
+  sha256_update (&s, (const uint8_t *) m, strlen (m));
+  (void) sha256_final (digest, &s);
+
+  check_result(1, expected, sizeof(expected), digest, sizeof(digest), 1);
+}
+
+/*
+ * NIST SHA256 test vector 2.
+ */
+void test_2 (void) {
+  printf ("\tPerforming SHA256 test #2...");
+  const uint8_t expected[32] = {
+    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
+  };
+  const char *m = "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq";
+  uint8_t digest[32];
+  struct sha256_state_struct s;
+
+  (void) sha256_init (&s);
+  sha256_update (&s, (const uint8_t *) m, strlen (m));
+  (void) sha256_final (digest, &s);
+
+  check_result(2, expected, sizeof(expected), digest, sizeof(digest), 1);
+}
+
+void test_3 (void) {
+  printf ("\tPerforming SHA256 test #3...");
+  const uint8_t expected[32] = {
+    0x68, 0x32, 0x57, 0x20, 0xaa, 0xbd, 0x7c, 0x82, 0xf3, 0x0f, 0x55, 0x4b,
+    0x31, 0x3d, 0x05, 0x70, 0xc9, 0x5a, 0xcc, 0xbb, 0x7d, 0xc4, 0xb5, 0xaa,
+    0xe1, 0x12, 0x04, 0xc0, 0x8f, 0xfe, 0x73, 0x2b
+  };
+  const uint8_t m[1] = { 0xbd };
+  uint8_t digest[32];
+  struct sha256_state_struct s;
+
+  (void) sha256_init (&s);
+  sha256_update (&s, m, sizeof (m));
+  (void) sha256_final (digest, &s);
+
+  check_result(3, expected, sizeof(expected), digest, sizeof(digest), 1);
+}
+
+void test_4 (void) {
+  printf ("\tPerforming SHA256 test #4...");
+  const uint8_t expected[32] = {
+    0x7a, 0xbc, 0x22, 0xc0, 0xae, 0x5a, 0xf2, 0x6c, 0xe9, 0x3d, 0xbb, 0x94,
+    0x43, 0x3a, 0x0e, 0x0b, 0x2e, 0x11, 0x9d, 0x01, 0x4f, 0x8e, 0x7f, 0x65,
+    0xbd, 0x56, 0xc6, 0x1c, 0xcc, 0xcd, 0x95, 0x04
+  };
+  const uint8_t m[4] = { 0xc9, 0x8c, 0x8e, 0x55 };
+  uint8_t digest[32];
+  struct sha256_state_struct s;
+
+  (void) sha256_init (&s);
+  sha256_update (&s, m, sizeof (m));
+  (void) sha256_final (digest, &s);
+
+  check_result(4, expected, sizeof(expected), digest, sizeof(digest), 1);
+}
+
+void test_5 (void) {
+  printf ("\tPerforming SHA256 test #5...");
+  const uint8_t expected[32] = {
+    0x02, 0x77, 0x94, 0x66, 0xcd, 0xec, 0x16, 0x38, 0x11, 0xd0, 0x78, 0x81,
+    0x5c, 0x63, 0x3f, 0x21, 0x90, 0x14, 0x13, 0x08, 0x14, 0x49, 0x00, 0x2f,
+    0x24, 0xaa, 0x3e, 0x80, 0xf0, 0xb8, 0x8e, 0xf7
+  };
+  uint8_t m[55];
+  uint8_t digest[32];
+  struct sha256_state_struct s;
+
+  (void) memset (m, 0x00, sizeof (m));
+
+  (void) sha256_init (&s);
+  sha256_update (&s, m, sizeof (m));
+  (void) sha256_final (digest, &s);
+
+  check_result(5, expected, sizeof(expected), digest, sizeof(digest), 1);
+}
+
+void test_6 (void) {
+  printf ("\tPerforming SHA256 test #6...");
+  const uint8_t expected[32] = {
+    0xd4, 0x81, 0x7a, 0xa5, 0x49, 0x76, 0x28, 0xe7, 0xc7, 0x7e, 0x6b, 0x60,
+    0x61, 0x07, 0x04, 0x2b, 0xbb, 0xa3, 0x13, 0x08, 0x88, 0xc5, 0xf4, 0x7a,
+    0x37, 0x5e, 0x61, 0x79, 0xbe, 0x78, 0x9f, 0xbb
+  };
+  uint8_t m[56];
+  uint8_t digest[32];
+  struct sha256_state_struct s;
+
+  (void) memset (m, 0x00, sizeof (m));
+
+  (void) sha256_init (&s);
+  sha256_update (&s, m, sizeof (m));
+  (void) sha256_final (digest, &s);
+
+  check_result(6, expected, sizeof(expected), digest, sizeof(digest), 1);
+}
+
+void test_7 (void) {
+  printf ("\tPerforming SHA256 test #7...");
+  const uint8_t expected[32] = {
+    0x65, 0xa1, 0x6c, 0xb7, 0x86, 0x13, 0x35, 0xd5, 0xac, 0xe3, 0xc6, 0x07,
+    0x18, 0xb5, 0x05, 0x2e, 0x44, 0x66, 0x07, 0x26, 0xda, 0x4c, 0xd1, 0x3b,
+    0xb7, 0x45, 0x38, 0x1b, 0x23, 0x5a, 0x17, 0x85
+  };
+  uint8_t m[57];
+  uint8_t digest[32];
+  struct sha256_state_struct s;
+
+  (void) memset (m, 0x00, sizeof (m));
+
+  (void) sha256_init (&s);
+  sha256_update (&s, m, sizeof (m));
+  (void) sha256_final (digest, &s);
+
+  check_result(7, expected, sizeof(expected), digest, sizeof(digest), 1);
+}
+
+void test_8 (void) {
+  printf ("\tPerforming SHA256 test #8...");
+  const uint8_t expected[32] = {
+    0xf5, 0xa5, 0xfd, 0x42, 0xd1, 0x6a, 0x20, 0x30, 0x27, 0x98, 0xef, 0x6e,
+    0xd3, 0x09, 0x97, 0x9b, 0x43, 0x00, 0x3d, 0x23, 0x20, 0xd9, 0xf0, 0xe8,
+    0xea, 0x98, 0x31, 0xa9, 0x27, 0x59, 0xfb, 0x4b
+  };
+  uint8_t m[64];
+  uint8_t digest[32];
+  struct sha256_state_struct s;
+
+  (void) memset (m, 0x00, sizeof (m));
+
+  (void) sha256_init (&s);
+  sha256_update (&s, m, sizeof (m));
+  (void) sha256_final (digest, &s);
+
+  check_result(8, expected, sizeof(expected), digest, sizeof(digest), 1);
+}
+
+void test_9 (void) {
+  printf ("\tPerforming SHA256 test #9...");
+  const uint8_t expected[32] = {
+    0x54, 0x1b, 0x3e, 0x9d, 0xaa, 0x09, 0xb2, 0x0b, 0xf8, 0x5f, 0xa2, 0x73,
+    0xe5, 0xcb, 0xd3, 0xe8, 0x01, 0x85, 0xaa, 0x4e, 0xc2, 0x98, 0xe7, 0x65,
+    0xdb, 0x87, 0x74, 0x2b, 0x70, 0x13, 0x8a, 0x53
+  };
+  uint8_t m[1000];
+  uint8_t digest[32];
+  struct sha256_state_struct s;
+
+  (void) memset (m, 0x00, sizeof (m));
+
+  (void) sha256_init (&s);
+  sha256_update (&s, m, sizeof (m));
+  (void) sha256_final (digest, &s);
+
+  check_result(9, expected, sizeof(expected), digest, sizeof(digest), 1);
+}
+
+void test_10 (void) {
+  printf ("\tPerforming SHA256 test #10...");
+  const uint8_t expected[32] = {
+    0xc2, 0xe6, 0x86, 0x82, 0x34, 0x89, 0xce, 0xd2, 0x01, 0x7f, 0x60, 0x59,
+    0xb8, 0xb2, 0x39, 0x31, 0x8b, 0x63, 0x64, 0xf6, 0xdc, 0xd8, 0x35, 0xd0,
+    0xa5, 0x19, 0x10, 0x5a, 0x1e, 0xad, 0xd6, 0xe4
+  };
+  uint8_t m[1000];
+  uint8_t digest[32];
+  struct sha256_state_struct s;
+
+  (void) memset (m, 0x41, sizeof (m));
+
+  (void) sha256_init (&s);
+  sha256_update (&s, m, sizeof (m));
+  (void) sha256_final (digest, &s);
+
+  check_result(10, expected, sizeof(expected), digest, sizeof(digest), 1);
+}
+
+void test_11 (void) {
+  printf ("\tPerforming SHA256 test #11...");
+  const uint8_t expected[32] = {
+    0xf4, 0xd6, 0x2d, 0xde, 0xc0, 0xf3, 0xdd, 0x90, 0xea, 0x13, 0x80, 0xfa,
+    0x16, 0xa5, 0xff, 0x8d, 0xc4, 0xc5, 0x4b, 0x21, 0x74, 0x06, 0x50, 0xf2,
+    0x4a, 0xfc, 0x41, 0x20, 0x90, 0x35, 0x52, 0xb0
+  };
+  uint8_t m[1005];
+  uint8_t digest[32];
+  struct sha256_state_struct s;
+
+  (void) memset (m, 0x55, sizeof (m));
+
+  (void) sha256_init (&s);
+  sha256_update (&s, m, sizeof (m));
+  (void) sha256_final (digest, &s);
+
+  check_result(11, expected, sizeof(expected), digest, sizeof(digest), 1);
+}
+
+void test_12 (void) {
+  printf ("\tPerforming SHA256 test #12...");
+  const uint8_t expected[32] = {
+    0xd2, 0x97, 0x51, 0xf2, 0x64, 0x9b, 0x32, 0xff, 0x57, 0x2b, 0x5e, 0x0a,
+    0x9f, 0x54, 0x1e, 0xa6, 0x60, 0xa5, 0x0f, 0x94, 0xff, 0x0b, 0xee, 0xdf,
+    0xb0, 0xb6, 0x92, 0xb9, 0x24, 0xcc, 0x80, 0x25
+  };
+  uint8_t m[1000];
+  uint8_t digest[32];
+  struct sha256_state_struct s;
+  uint32_t i;
+
+  (void) memset (m, 0x00, sizeof (m));
+
+  (void) sha256_init (&s);
+  for (i = 0; i < 1000; ++i) {
+    sha256_update (&s, m, sizeof (m));
+  }
+  (void) sha256_final (digest, &s);
+
+  check_result(12, expected, sizeof(expected), digest, sizeof(digest), 1);
+}
+
+void test_13 (void) {
+  printf ("\tPerforming SHA256 test #13...");
+  const uint8_t expected[32] = {
+    0x15, 0xa1, 0x86, 0x8c, 0x12, 0xcc, 0x53, 0x95, 0x1e, 0x18, 0x23, 0x44,
+    0x27, 0x74, 0x47, 0xcd, 0x09, 0x79, 0x53, 0x6b, 0xad, 0xcc, 0x51, 0x2a,
+    0xd2, 0x4c, 0x67, 0xe9, 0xb2, 0xd4, 0xf3, 0xdd
+  };
+  uint8_t m[32768];
+  uint8_t digest[32];
+  struct sha256_state_struct s;
+  uint32_t i;
+
+  (void) memset (m, 0x5a, sizeof (m));
+
+  (void) sha256_init (&s);
+  for (i = 0; i < 16384; ++i) {
+    sha256_update (&s, m, sizeof (m));
+  }
+  (void) sha256_final (digest, &s);
+
+  check_result(13, expected, sizeof(expected), digest, sizeof(digest), 1);
+}
+
+void test_14 (void) {
+  printf ("\tPerforming SHA256 test #14...");
+  const uint8_t expected[32] = {
+    0x46, 0x1c, 0x19, 0xa9, 0x3b, 0xd4, 0x34, 0x4f, 0x92, 0x15, 0xf5, 0xec,
+    0x64, 0x35, 0x70, 0x90, 0x34, 0x2b, 0xc6, 0x6b, 0x15, 0xa1, 0x48, 0x31,
+    0x7d, 0x27, 0x6e, 0x31, 0xcb, 0xc2, 0x0b, 0x53
+  };
+  uint8_t m[32768];
+  uint8_t digest[32];
+  struct sha256_state_struct s;
+  uint32_t i;
+
+  (void) memset (m, 0x00, sizeof (m));
+
+  (void) sha256_init (&s);
+  for (i = 0; i < 33280; ++i) {
+    sha256_update (&s, m, sizeof (m));
+  }
+  (void) sha256_final (digest, &s);
+
+  check_result(14, expected, sizeof(expected), digest, sizeof(digest), 1);
+}
+
+
+int32_t main (void) {
+
+  setbuf(stdout, NULL);
+  printf ("Performing SHA256 tests (NIST tests vectors)...\n");
+  test_1 ();
+  test_2 ();
+  test_3 ();
+  test_4 ();
+  test_5 ();
+  test_6 ();
+  test_7 ();
+  test_8 ();
+  test_9 ();
+  test_10 ();
+  test_11 ();
+  test_12 ();
+  test_13 ();
+  test_14 ();
+  printf ("All SHA256 tests succeeded!\n\n");
+  return 0;
+}
+
+