/*############################################################################
# Copyright 2017 Intel Corporation
#
# 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.
############################################################################*/

/*
 *  Copyright (C) 2017 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.
 */

/*
  DESCRIPTION
  This module tests the following SHA256 routines:

  Scenarios tested include:
  - NIST SHA256 test vectors
*/
#include <gtest/gtest.h>

namespace {
extern "C" {
#include "epid/member/tiny/math/sha256.h"
}

TEST(TinySha256Test, tc_sha256_update_SucceedsGivenZeroMessageLength) {
  const uint8_t expected[32] = {0xe3, 0xb0, 0xc4, 0x42, 0x98, 0xfc, 0x1c, 0x14,
                                0x9a, 0xfb, 0xf4, 0xc8, 0x99, 0x6f, 0xb9, 0x24,
                                0x27, 0xae, 0x41, 0xe4, 0x64, 0x9b, 0x93, 0x4c,
                                0xa4, 0x95, 0x99, 0x1b, 0x78, 0x52, 0xb8, 0x55};
  const char* m = "";
  sha256_state s;
  uint8_t digest[32];
  tc_sha256_init(&s);
  tc_sha256_update(&s, (const uint8_t*)m, 0);
  tc_sha256_final(digest, &s);
  EXPECT_TRUE(0 == memcmp(expected, digest, sizeof(digest)))
      << digest << std::endl
      << expected;
}
/*
 * NIST SHA256 test vector 1.
 */
TEST(TinySha256Test, tc_sha256_WorksGivenNistTestVector1) {
  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];
  sha256_state s;

  tc_sha256_init(&s);
  tc_sha256_update(&s, (const uint8_t*)m, strlen(m));
  tc_sha256_final(digest, &s);
  EXPECT_TRUE(0 == memcmp(expected, digest, sizeof(digest)))
      << digest << std::endl
      << expected;
}

/*
 * NIST SHA256 test vector 2.
 */
TEST(TinySha256Test, tc_sha256_WorksGivenNistTestVector2) {
  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];
  sha256_state s;

  tc_sha256_init(&s);
  tc_sha256_update(&s, (const uint8_t*)m, strlen(m));
  tc_sha256_final(digest, &s);
  EXPECT_TRUE(0 == memcmp(expected, digest, sizeof(digest)))
      << digest << std::endl
      << expected;
}

TEST(TinySha256Test, tc_sha256_WorksGiven1NonZeroChar) {
  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];
  sha256_state s;

  tc_sha256_init(&s);
  tc_sha256_update(&s, m, sizeof(m));
  tc_sha256_final(digest, &s);
  EXPECT_TRUE(0 == memcmp(expected, digest, sizeof(digest)))
      << digest << std::endl
      << expected;
}

TEST(TinySha256Test, tc_sha256_WorksGiven4NonZeroChars) {
  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];
  sha256_state s;

  tc_sha256_init(&s);
  tc_sha256_update(&s, m, sizeof(m));
  tc_sha256_final(digest, &s);
  EXPECT_TRUE(0 == memcmp(expected, digest, sizeof(digest)))
      << digest << std::endl
      << expected;
}

TEST(TinySha256Test, tc_sha256_WorksGiven55ZeroChars) {
  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];
  sha256_state s;

  (void)memset(m, 0x00, sizeof(m));

  tc_sha256_init(&s);
  tc_sha256_update(&s, m, sizeof(m));
  tc_sha256_final(digest, &s);
  EXPECT_TRUE(0 == memcmp(expected, digest, sizeof(digest)))
      << digest << std::endl
      << expected;
}

TEST(TinySha256Test, tc_sha256_WorksGiven56ZeroChars) {
  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];
  sha256_state s;

  (void)memset(m, 0x00, sizeof(m));

  tc_sha256_init(&s);
  tc_sha256_update(&s, m, sizeof(m));
  tc_sha256_final(digest, &s);
  EXPECT_TRUE(0 == memcmp(expected, digest, sizeof(digest)))
      << digest << std::endl
      << expected;
}

TEST(TinySha256Test, tc_sha256_WorksGiven57ZeroChars) {
  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];
  sha256_state s;

  (void)memset(m, 0x00, sizeof(m));

  tc_sha256_init(&s);
  tc_sha256_update(&s, m, sizeof(m));
  tc_sha256_final(digest, &s);
  EXPECT_TRUE(0 == memcmp(expected, digest, sizeof(digest)))
      << digest << std::endl
      << expected;
}

TEST(TinySha256Test, tc_sha256_WorksGiven64ZeroChars) {
  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];
  sha256_state s;

  (void)memset(m, 0x00, sizeof(m));

  tc_sha256_init(&s);
  tc_sha256_update(&s, m, sizeof(m));
  tc_sha256_final(digest, &s);
  EXPECT_TRUE(0 == memcmp(expected, digest, sizeof(digest)))
      << digest << std::endl
      << expected;
}

TEST(TinySha256Test, tc_sha256_WorksGiven1000ZeroChars) {
  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];
  sha256_state s;

  (void)memset(m, 0x00, sizeof(m));

  tc_sha256_init(&s);
  tc_sha256_update(&s, m, sizeof(m));
  tc_sha256_final(digest, &s);
  EXPECT_TRUE(0 == memcmp(expected, digest, sizeof(digest)))
      << digest << std::endl
      << expected;
}

TEST(TinySha256Test, tc_sha256_WorksGiven1000NonZeroChars) {
  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];
  sha256_state s;

  (void)memset(m, 0x41, sizeof(m));

  tc_sha256_init(&s);
  tc_sha256_update(&s, m, sizeof(m));
  tc_sha256_final(digest, &s);
  EXPECT_TRUE(0 == memcmp(expected, digest, sizeof(digest)))
      << digest << std::endl
      << expected;
}

TEST(TinySha256Test, tc_sha256_WorksGiven1005NonZeroChars) {
  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];
  sha256_state s;

  (void)memset(m, 0x55, sizeof(m));

  tc_sha256_init(&s);
  tc_sha256_update(&s, m, sizeof(m));
  tc_sha256_final(digest, &s);
  EXPECT_TRUE(0 == memcmp(expected, digest, sizeof(digest)))
      << digest << std::endl
      << expected;
}

TEST(TinySha256Test, tc_sha256_WorksGiven1000ZeroCharsUpdated1000Times) {
  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];
  sha256_state s;
  unsigned int i;

  (void)memset(m, 0x00, sizeof(m));

  tc_sha256_init(&s);
  for (i = 0; i < 1000; ++i) {
    tc_sha256_update(&s, m, sizeof(m));
  }
  tc_sha256_final(digest, &s);
  EXPECT_TRUE(0 == memcmp(expected, digest, sizeof(digest)))
      << digest << std::endl
      << expected;
}

TEST(TinySha256Test,
     DISABLED_SLOW_tc_sha256_WorksGiven32768NonZeroCharsUpdated16384Times) {
  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];
  sha256_state s;
  unsigned int i;

  (void)memset(m, 0x5a, sizeof(m));

  tc_sha256_init(&s);
  for (i = 0; i < 16384; ++i) {
    tc_sha256_update(&s, m, sizeof(m));
  }
  tc_sha256_final(digest, &s);
  EXPECT_TRUE(0 == memcmp(expected, digest, sizeof(digest)))
      << digest << std::endl
      << expected;
}

TEST(TinySha256Test,
     DISABLED_SLOW_tc_sha256_WorksGiven32768NonZeroCharsUpdated33280Times) {
  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];
  sha256_state s;
  unsigned int i;

  (void)memset(m, 0x00, sizeof(m));

  tc_sha256_init(&s);
  for (i = 0; i < 33280; ++i) {
    tc_sha256_update(&s, m, sizeof(m));
  }
  tc_sha256_final(digest, &s);
  EXPECT_TRUE(0 == memcmp(expected, digest, sizeof(digest)))
      << digest << std::endl
      << expected;
}
}  // namespace