// Copyright 2016 The PDFium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "core/fdrm/fx_crypt.h"

#include <algorithm>
#include <string>
#include <tuple>
#include <vector>

#include "core/fxcrt/bytestring.h"
#include "core/fxcrt/data_vector.h"
#include "core/fxcrt/fx_extension.h"
#include "core/fxcrt/fx_memcpy_wrappers.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "testing/utils/hash.h"

using ::testing::ElementsAre;
using ::testing::ElementsAreArray;

namespace {

std::string CRYPT_MD5String(const char* str) {
  return GenerateMD5Base16(ByteStringView(str).unsigned_span());
}

void CheckArcFourContext(const CRYPT_rc4_context& context,
                         int32_t expected_x,
                         int32_t expected_y,
                         pdfium::span<const uint8_t> expected_permutation) {
  EXPECT_EQ(expected_x, context.x);
  EXPECT_EQ(expected_y, context.y);
  EXPECT_THAT(context.m, ElementsAreArray(expected_permutation));
}

// Helper function to convert a hexadecimal string to a vector of bytes.
std::vector<uint8_t> HexToBytes(const std::string& hex) {
  std::vector<uint8_t> bytes;
  bytes.reserve(hex.size() / 2);
  for (size_t i = 0; i + 1 < hex.size(); i += 2) {
    int val = 16 * FXSYS_HexCharToInt(hex[i]) + FXSYS_HexCharToInt(hex[i + 1]);
    bytes.push_back(static_cast<uint8_t>(val));
  }
  return bytes;
}

}  // namespace

// Originally from chromium's /src/base/md5_unittest.cc.
TEST(FXCRYPT, CryptToBase16) {
  static constexpr uint8_t kData[] = {0xd4, 0x1d, 0x8c, 0xd9, 0x8f, 0x00,
                                      0xb2, 0x04, 0xe9, 0x80, 0x09, 0x98,
                                      0xec, 0xf8, 0x42, 0x7e};

  std::string actual = CryptToBase16(kData);
  std::string expected = "d41d8cd98f00b204e9800998ecf8427e";

  EXPECT_EQ(expected, actual);
}

TEST(FXCRYPT, MD5GenerateEmtpyData) {
  uint8_t digest[16];
  CRYPT_MD5Generate({}, digest);
  EXPECT_THAT(digest,
              ElementsAre(0xd4, 0x1d, 0x8c, 0xd9, 0x8f, 0x00, 0xb2, 0x04, 0xe9,
                          0x80, 0x09, 0x98, 0xec, 0xf8, 0x42, 0x7e));
}

TEST(FXCRYPT, MD5GenerateOneByteData) {
  const char c = 'a';
  uint8_t digest[16];
  CRYPT_MD5Generate(pdfium::byte_span_from_ref(c), digest);
  EXPECT_THAT(digest,
              ElementsAre(0x0c, 0xc1, 0x75, 0xb9, 0xc0, 0xf1, 0xb6, 0xa8, 0x31,
                          0xc3, 0x99, 0xe2, 0x69, 0x77, 0x26, 0x61));
}

TEST(FXCRYPT, MD5GenerateLongData) {
  const uint32_t length = 10 * 1024 * 1024 + 1;
  std::vector<uint8_t> data(length);

  for (uint32_t i = 0; i < length; ++i) {
    data[i] = i & 0xFF;
  }

  uint8_t digest[16];
  CRYPT_MD5Generate(data, digest);
  EXPECT_THAT(digest,
              ElementsAre(0x90, 0xbd, 0x6a, 0xd9, 0x0a, 0xce, 0xf5, 0xad, 0xaa,
                          0x92, 0x20, 0x3e, 0x21, 0xc7, 0xa1, 0x3e));
}

TEST(FXCRYPT, ContextWithEmptyData) {
  CRYPT_md5_context ctx = CRYPT_MD5Start();

  uint8_t digest[16];
  CRYPT_MD5Finish(&ctx, digest);
  EXPECT_THAT(digest,
              ElementsAre(0xd4, 0x1d, 0x8c, 0xd9, 0x8f, 0x00, 0xb2, 0x04, 0xe9,
                          0x80, 0x09, 0x98, 0xec, 0xf8, 0x42, 0x7e));
}

TEST(FXCRYPT, ContextWithLongData) {
  CRYPT_md5_context ctx = CRYPT_MD5Start();

  const uint32_t length = 10 * 1024 * 1024 + 1;
  std::vector<uint8_t> data(length);

  for (uint32_t i = 0; i < length; ++i) {
    data[i] = i & 0xFF;
  }

  pdfium::span<const uint8_t> data_span = pdfium::span(data);
  uint32_t total = 0;
  while (total < length) {
    static constexpr uint32_t kChunkLen = 4097;  // intentionally not 2^k.
    uint32_t len = std::min(kChunkLen, length - total);
    CRYPT_MD5Update(&ctx, data_span.subspan(total, len));
    total += len;
  }

  EXPECT_EQ(length, total);

  uint8_t digest[16];
  CRYPT_MD5Finish(&ctx, digest);
  EXPECT_THAT(digest,
              ElementsAre(0x90, 0xbd, 0x6a, 0xd9, 0x0a, 0xce, 0xf5, 0xad, 0xaa,
                          0x92, 0x20, 0x3e, 0x21, 0xc7, 0xa1, 0x3e));
}

// Example data from http://www.ietf.org/rfc/rfc1321.txt A.5 Test Suite
TEST(FXCRYPT, MD5StringTestSuite1) {
  std::string actual = CRYPT_MD5String("");
  std::string expected = "d41d8cd98f00b204e9800998ecf8427e";
  EXPECT_EQ(expected, actual);
}

TEST(FXCRYPT, MD5StringTestSuite2) {
  std::string actual = CRYPT_MD5String("a");
  std::string expected = "0cc175b9c0f1b6a831c399e269772661";
  EXPECT_EQ(expected, actual);
}

TEST(FXCRYPT, MD5StringTestSuite3) {
  std::string actual = CRYPT_MD5String("abc");
  std::string expected = "900150983cd24fb0d6963f7d28e17f72";
  EXPECT_EQ(expected, actual);
}

TEST(FXCRYPT, MD5StringTestSuite4) {
  std::string actual = CRYPT_MD5String("message digest");
  std::string expected = "f96b697d7cb7938d525a2f31aaf161d0";
  EXPECT_EQ(expected, actual);
}

TEST(FXCRYPT, MD5StringTestSuite5) {
  std::string actual = CRYPT_MD5String("abcdefghijklmnopqrstuvwxyz");
  std::string expected = "c3fcd3d76192e4007dfb496cca67e13b";
  EXPECT_EQ(expected, actual);
}

TEST(FXCRYPT, MD5StringTestSuite6) {
  std::string actual = CRYPT_MD5String(
      "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
      "abcdefghijklmnopqrstuvwxyz"
      "0123456789");
  std::string expected = "d174ab98d277d9f5a5611c2c9f419d9f";
  EXPECT_EQ(expected, actual);
}

TEST(FXCRYPT, MD5StringTestSuite7) {
  std::string actual = CRYPT_MD5String(
      "12345678901234567890"
      "12345678901234567890"
      "12345678901234567890"
      "12345678901234567890");
  std::string expected = "57edf4a22be3c955ac49da2e2107b67a";
  EXPECT_EQ(expected, actual);
}

TEST(FXCRYPT, ContextWithStringData) {
  CRYPT_md5_context ctx = CRYPT_MD5Start();
  CRYPT_MD5Update(&ctx, ByteStringView("abc").unsigned_span());

  uint8_t digest[16];
  CRYPT_MD5Finish(&ctx, digest);

  std::string actual = CryptToBase16(digest);
  std::string expected = "900150983cd24fb0d6963f7d28e17f72";
  EXPECT_EQ(expected, actual);
}

TEST(FXCRYPT, Sha1Empty) {
  static const char kInput[] = "";
  DataVector<uint8_t> actual =
      CRYPT_SHA1Generate(ByteStringView(kInput).unsigned_span());
  EXPECT_THAT(actual, ElementsAre(0xda, 0x39, 0xa3, 0xee, 0x5e, 0x6b, 0x4b,
                                  0x0d, 0x32, 0x55, 0xbf, 0xef, 0x95, 0x60,
                                  0x18, 0x90, 0xaf, 0xd8, 0x07, 0x09));
}

// Originally from chromium's /src/base/sha1_unittest.cc
TEST(FXCRYPT, Sha1TestA1) {
  // Example A.1 from FIPS 180-2: one-block message.
  static const char kInput[] = "abc";
  DataVector<uint8_t> actual =
      CRYPT_SHA1Generate(ByteStringView(kInput).unsigned_span());
  EXPECT_THAT(actual, ElementsAre(0xa9, 0x99, 0x3e, 0x36, 0x47, 0x06, 0x81,
                                  0x6a, 0xba, 0x3e, 0x25, 0x71, 0x78, 0x50,
                                  0xc2, 0x6c, 0x9c, 0xd0, 0xd8, 0x9d));
}

TEST(FXCRYPT, Sha1TestA2) {
  // Example A.2 from FIPS 180-2: multi-block message.
  static const char kInput[] =
      "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq";
  DataVector<uint8_t> actual =
      CRYPT_SHA1Generate(ByteStringView(kInput).unsigned_span());
  EXPECT_THAT(actual, ElementsAre(0x84, 0x98, 0x3e, 0x44, 0x1c, 0x3b, 0xd2,
                                  0x6e, 0xba, 0xae, 0x4a, 0xa1, 0xf9, 0x51,
                                  0x29, 0xe5, 0xe5, 0x46, 0x70, 0xf1));
}

TEST(FXCRYPT, Sha256Empty) {
  static const char kInput[] = "";
  DataVector<uint8_t> actual =

      CRYPT_SHA256Generate(ByteStringView(kInput).unsigned_span());
  EXPECT_THAT(actual,
              ElementsAre(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));
}

TEST(FXCRYPT, Sha256TestB1) {
  // Example B.1 from FIPS 180-2: one-block message.
  static const char kInput[] = "abc";
  DataVector<uint8_t> actual =
      CRYPT_SHA256Generate(ByteStringView(kInput).unsigned_span());
  EXPECT_THAT(actual,
              ElementsAre(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));
}

TEST(FXCRYPT, Sha256TestB2) {
  // Example B.2 from FIPS 180-2: multi-block message.
  static const char kInput[] =
      "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq";
  DataVector<uint8_t> actual =
      CRYPT_SHA256Generate(ByteStringView(kInput).unsigned_span());
  EXPECT_THAT(actual,
              ElementsAre(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));
}

TEST(FXCRYPT, CRYPTArcFourSetup) {
  {
    static const uint8_t
        kNullPermutation[CRYPT_rc4_context::kPermutationLength] = {
            0,   35,  3,   43,  9,   11,  65,  229, 32,  36,  134, 98,  59,
            34,  173, 153, 214, 200, 64,  161, 191, 62,  6,   25,  56,  234,
            49,  246, 69,  133, 203, 194, 10,  42,  228, 198, 195, 245, 236,
            91,  206, 23,  235, 27,  138, 18,  143, 250, 244, 76,  123, 217,
            132, 249, 72,  127, 94,  151, 33,  60,  248, 85,  177, 210, 142,
            83,  110, 140, 41,  135, 196, 238, 156, 242, 141, 67,  5,   185,
            131, 63,  137, 37,  172, 121, 70,  144, 237, 130, 17,  44,  253,
            166, 78,  201, 12,  119, 215, 7,   126, 114, 97,  192, 53,  4,
            254, 45,  102, 122, 230, 88,  193, 129, 160, 124, 84,  108, 239,
            189, 152, 120, 115, 207, 50,  176, 86,  157, 164, 187, 71,  1,
            15,  58,  29,  21,  46,  145, 247, 162, 95,  183, 13,  226, 159,
            175, 221, 100, 96,  202, 101, 178, 154, 47,  205, 106, 148, 104,
            93,  112, 26,  165, 128, 186, 146, 218, 66,  211, 171, 90,  252,
            19,  40,  99,  223, 174, 255, 51,  77,  227, 48,  220, 168, 118,
            224, 103, 75,  105, 125, 199, 73,  82,  57,  181, 81,  149, 68,
            52,  232, 22,  2,   216, 113, 30,  109, 163, 92,  61,  14,  8,
            38,  225, 79,  231, 170, 240, 20,  219, 204, 150, 180, 188, 116,
            190, 241, 197, 179, 87,  74,  147, 80,  54,  212, 16,  167, 222,
            136, 213, 55,  182, 139, 24,  209, 251, 208, 28,  111, 89,  158,
            155, 243, 107, 233, 169, 117, 184, 31,  39};
    CRYPT_rc4_context context;
    CRYPT_ArcFourSetup(&context, {});
    CheckArcFourContext(context, 0, 0, kNullPermutation);
  }
  {
    static const uint8_t
        kFoobarPermutation[CRYPT_rc4_context::kPermutationLength] = {
            102, 214, 39,  49,  17,  132, 244, 106, 114, 76,  183, 212, 116,
            73,  42,  103, 128, 246, 139, 199, 31,  234, 25,  109, 48,  19,
            121, 4,   20,  54,  134, 77,  163, 38,  61,  101, 145, 78,  215,
            96,  92,  80,  224, 168, 243, 210, 82,  252, 113, 56,  217, 62,
            218, 129, 125, 33,  99,  9,   153, 59,  43,  13,  206, 124, 131,
            18,  213, 118, 173, 122, 193, 172, 177, 105, 148, 207, 186, 5,
            85,  32,  68,  220, 79,  84,  169, 209, 150, 7,   133, 63,  147,
            93,  26,  130, 60,  117, 250, 57,  24,  247, 200, 127, 136, 66,
            112, 107, 140, 154, 70,  170, 185, 138, 248, 236, 88,  86,  44,
            216, 241, 35,  100, 151, 156, 74,  119, 55,  245, 46,  227, 208,
            229, 16,  249, 149, 53,  157, 201, 75,  58,  28,  142, 238, 182,
            180, 179, 144, 12,  6,   176, 10,  90,  239, 104, 40,  181, 194,
            137, 69,  221, 205, 165, 188, 191, 87,  1,   91,  2,   171, 232,
            34,  162, 166, 160, 126, 225, 167, 123, 197, 223, 195, 22,  203,
            189, 237, 37,  27,  222, 175, 23,  143, 152, 192, 21,  231, 228,
            141, 30,  204, 158, 240, 120, 98,  89,  83,  135, 251, 81,  196,
            161, 3,   8,   230, 52,  219, 41,  242, 36,  97,  15,  155, 65,
            187, 254, 64,  159, 67,  211, 108, 178, 146, 202, 11,  164, 226,
            184, 50,  190, 174, 71,  233, 235, 198, 95,  51,  110, 255, 253,
            72,  115, 0,   47,  94,  29,  45,  14,  111};
    CRYPT_rc4_context context;
    ByteStringView foobar = "foobar";
    CRYPT_ArcFourSetup(&context, foobar.unsigned_span());
    CheckArcFourContext(context, 0, 0, kFoobarPermutation);
  }
}

TEST(FXCRYPT, CRYPTArcFourCrypt) {
  static const uint8_t kDataShort[] =
      "The Quick Fox Jumped Over The Lazy Brown Dog.";
  static const uint8_t kDataLong[] =
      "The Quick Fox Jumped Over The Lazy Brown Dog.\n"
      "1234567890123456789012345678901234567890123456789012345678901234567890\n"
      "1234567890123456789012345678901234567890123456789012345678901234567890\n"
      "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ\n"
      "!@#$%^&*()[]{};':\",.<>/?\\|\r\t\n";
  {
    CRYPT_rc4_context context;
    CRYPT_ArcFourSetup(&context, {});

    std::vector<uint8_t> data_short(std::begin(kDataShort),
                                    std::end(kDataShort));
    static const uint8_t kExpectedEncryptedDataShort[] = {
        138, 112, 236, 97,  242, 66,  52,  89,  225, 38,  88,  8,
        47,  78,  216, 24,  170, 106, 26,  199, 208, 131, 157, 242,
        55,  11,  25,  90,  66,  182, 19,  255, 210, 181, 85,  69,
        31,  240, 206, 171, 97,  62,  202, 172, 30,  252};
    CRYPT_ArcFourCrypt(&context, data_short);
    EXPECT_THAT(data_short, ElementsAreArray(kExpectedEncryptedDataShort));

    static const uint8_t kPermutation[CRYPT_rc4_context::kPermutationLength] = {
        0,   198, 10,  37,  253, 192, 171, 183, 99,  8,   144, 103, 208, 191,
        149, 9,   228, 243, 94,  150, 169, 151, 210, 206, 221, 235, 32,  186,
        212, 122, 72,  200, 236, 138, 244, 217, 158, 213, 139, 242, 17,  143,
        50,  132, 12,  160, 145, 250, 214, 76,  123, 35,  27,  249, 203, 127,
        64,  62,  33,  60,  248, 85,  177, 6,   142, 83,  110, 140, 41,  135,
        196, 238, 156, 91,  141, 67,  5,   185, 131, 63,  137, 43,  172, 121,
        70,  134, 237, 130, 25,  44,  153, 166, 78,  201, 42,  119, 215, 7,
        126, 114, 97,  11,  53,  4,   254, 45,  102, 133, 230, 88,  193, 129,
        18,  124, 84,  108, 239, 189, 152, 120, 115, 207, 234, 176, 86,  157,
        164, 187, 71,  1,   15,  58,  29,  21,  46,  23,  247, 162, 95,  229,
        13,  226, 159, 175, 56,  100, 96,  202, 101, 178, 154, 47,  205, 106,
        148, 104, 93,  112, 26,  165, 128, 246, 146, 218, 66,  211, 65,  90,
        252, 19,  40,  49,  223, 174, 255, 51,  77,  227, 48,  220, 168, 118,
        224, 98,  75,  105, 125, 199, 73,  82,  57,  181, 81,  173, 68,  52,
        232, 22,  2,   216, 113, 30,  109, 163, 92,  61,  14,  36,  38,  225,
        79,  231, 170, 240, 20,  219, 204, 161, 180, 188, 116, 190, 241, 197,
        179, 87,  74,  147, 80,  54,  69,  16,  167, 222, 136, 245, 55,  182,
        3,   24,  209, 251, 59,  28,  111, 89,  195, 155, 194, 107, 233, 34,
        117, 184, 31,  39};
    CheckArcFourContext(context, 46, 135, kPermutation);
  }
  {
    CRYPT_rc4_context context;
    CRYPT_ArcFourSetup(&context, {});

    std::vector<uint8_t> data_long(std::begin(kDataLong), std::end(kDataLong));
    static const uint8_t kExpectedEncryptedDataLong[] = {
        138, 112, 236, 97,  242, 66,  52,  89,  225, 38,  88,  8,   47,  78,
        216, 24,  170, 106, 26,  199, 208, 131, 157, 242, 55,  11,  25,  90,
        66,  182, 19,  255, 210, 181, 85,  69,  31,  240, 206, 171, 97,  62,
        202, 172, 30,  246, 19,  43,  184, 0,   173, 27,  140, 90,  167, 240,
        122, 125, 184, 49,  149, 71,  63,  104, 171, 144, 242, 106, 121, 124,
        209, 149, 61,  1,   66,  186, 252, 47,  51,  170, 253, 75,  95,  41,
        203, 28,  197, 174, 144, 209, 166, 98,  142, 125, 44,  5,   147, 42,
        73,  178, 119, 90,  253, 69,  103, 178, 15,  136, 51,  112, 39,  81,
        37,  111, 129, 232, 106, 159, 126, 142, 120, 124, 48,  140, 253, 12,
        223, 208, 106, 76,  60,  238, 5,   162, 100, 226, 251, 156, 169, 35,
        193, 10,  242, 210, 20,  96,  37,  84,  99,  183, 179, 203, 62,  122,
        54,  6,   51,  239, 142, 250, 238, 41,  223, 58,  48,  101, 29,  187,
        43,  235, 3,   5,   176, 33,  14,  171, 36,  26,  234, 207, 105, 79,
        69,  126, 82,  183, 105, 228, 31,  173, 8,   240, 99,  5,   147, 206,
        215, 140, 48,  190, 165, 50,  41,  232, 29,  105, 156, 64,  229, 165,
        12,  64,  163, 255, 146, 108, 212, 125, 142, 101, 13,  99,  174, 10,
        160, 68,  196, 120, 110, 201, 254, 158, 97,  215, 0,   207, 90,  23,
        208, 161, 105, 226, 164, 114, 80,  137, 58,  107, 109, 42,  110, 100,
        202, 170, 224, 89,  28,  5,   138, 19,  253, 105, 220, 105, 24,  187,
        109, 89,  205, 89,  202};
    CRYPT_ArcFourCrypt(&context, data_long);
    EXPECT_THAT(data_long, ElementsAreArray(kExpectedEncryptedDataLong));

    static const uint8_t kPermutation[CRYPT_rc4_context::kPermutationLength] = {
        172, 59,  196, 72,  101, 21,  215, 210, 212, 52,  243, 73,  47,  213,
        211, 50,  228, 144, 66,  93,  169, 31,  237, 206, 221, 235, 222, 250,
        97,  87,  174, 164, 190, 111, 27,  217, 173, 189, 65,  11,  115, 171,
        104, 132, 12,  170, 205, 114, 7,   105, 37,  83,  78,  134, 236, 70,
        197, 122, 177, 202, 39,  195, 30,  3,   86,  127, 74,  106, 68,  91,
        110, 121, 208, 25,  56,  6,   28,  225, 163, 193, 166, 244, 119, 34,
        23,  88,  108, 123, 162, 159, 242, 61,  230, 227, 254, 14,  4,   156,
        161, 44,  58,  153, 33,  143, 129, 232, 182, 152, 76,  168, 238, 239,
        185, 219, 233, 16,  188, 45,  40,  35,  103, 99,  89,  157, 241, 245,
        192, 180, 248, 8,   85,  231, 146, 154, 252, 181, 107, 126, 98,  80,
        102, 165, 199, 94,  49,  255, 18,  204, 216, 77,  20,  187, 145, 125,
        1,   247, 79,  26,  207, 81,  117, 179, 186, 38,  175, 19,  139, 138,
        149, 54,  64,  109, 249, 135, 142, 118, 17,  13,  201, 184, 55,  224,
        209, 155, 113, 218, 82,  131, 178, 253, 140, 226, 43,  42,  24,  29,
        229, 200, 137, 240, 203, 167, 95,  148, 15,  176, 60,  75,  53,  41,
        150, 112, 160, 96,  22,  10,  234, 116, 130, 158, 214, 36,  9,   67,
        198, 194, 191, 100, 124, 147, 32,  183, 120, 246, 51,  141, 46,  251,
        92,  223, 133, 63,  0,   71,  48,  128, 220, 90,  62,  136, 2,   5,
        69,  57,  151, 84};
    CheckArcFourContext(context, 15, 222, kPermutation);
  }
  {
    CRYPT_rc4_context context;
    ByteStringView foobar = "foobar";
    CRYPT_ArcFourSetup(&context, foobar.unsigned_span());

    std::vector<uint8_t> data_short(std::begin(kDataShort),
                                    std::end(kDataShort));
    static const uint8_t kExpectedEncryptedDataShort[] = {
        59,  193, 117, 206, 167, 54,  218, 7,   229, 214, 188, 55,
        90,  205, 196, 25,  36,  114, 199, 218, 161, 107, 122, 119,
        106, 167, 44,  175, 240, 123, 192, 102, 174, 167, 105, 187,
        202, 70,  121, 81,  17,  30,  5,   138, 116, 166};
    CRYPT_ArcFourCrypt(&context, data_short);
    EXPECT_THAT(data_short, ElementsAreArray(kExpectedEncryptedDataShort));

    static const uint8_t kPermutation[CRYPT_rc4_context::kPermutationLength] = {
        102, 41,  45,  82,  124, 141, 237, 38,  6,   64,  90,  140, 254, 96,
        220, 109, 99,  49,  27,  227, 205, 75,  191, 37,  17,  54,  83,  196,
        108, 79,  31,  190, 180, 0,   125, 194, 243, 156, 224, 246, 253, 193,
        42,  81,  117, 56,  181, 252, 113, 210, 217, 62,  218, 129, 61,  33,
        128, 9,   153, 59,  43,  13,  206, 48,  131, 18,  213, 118, 173, 122,
        80,  172, 177, 105, 148, 207, 186, 5,   85,  32,  68,  215, 19,  84,
        169, 209, 150, 7,   133, 63,  147, 93,  26,  130, 60,  145, 250, 57,
        24,  247, 200, 127, 136, 66,  112, 107, 212, 154, 70,  170, 185, 138,
        248, 236, 88,  86,  44,  216, 241, 35,  100, 151, 78,  74,  119, 55,
        245, 46,  199, 208, 229, 16,  249, 149, 53,  157, 201, 234, 58,  28,
        142, 238, 182, 163, 179, 144, 12,  114, 176, 10,  183, 239, 104, 40,
        73,  101, 137, 69,  221, 134, 165, 188, 25,  87,  1,   91,  2,   171,
        232, 34,  162, 166, 160, 126, 225, 167, 123, 197, 223, 195, 22,  203,
        189, 244, 103, 139, 222, 175, 23,  143, 152, 192, 21,  231, 228, 132,
        30,  204, 158, 240, 120, 98,  89,  121, 135, 251, 168, 4,   161, 3,
        8,   230, 52,  219, 214, 242, 36,  97,  15,  155, 65,  187, 116, 76,
        159, 67,  211, 20,  178, 146, 202, 11,  164, 226, 184, 50,  77,  174,
        71,  233, 235, 198, 95,  51,  110, 255, 92,  72,  115, 106, 47,  94,
        29,  39,  14,  111};
    CheckArcFourContext(context, 46, 39, kPermutation);
  }
  {
    CRYPT_rc4_context context;
    ByteStringView foobar = "foobar";
    CRYPT_ArcFourSetup(&context, foobar.unsigned_span());

    std::vector<uint8_t> data_long(std::begin(kDataLong), std::end(kDataLong));
    static const uint8_t kExpectedEncryptedDataLong[] = {
        59,  193, 117, 206, 167, 54,  218, 7,   229, 214, 188, 55,  90,  205,
        196, 25,  36,  114, 199, 218, 161, 107, 122, 119, 106, 167, 44,  175,
        240, 123, 192, 102, 174, 167, 105, 187, 202, 70,  121, 81,  17,  30,
        5,   138, 116, 172, 169, 50,  160, 116, 237, 117, 108, 241, 127, 61,
        83,  45,  77,  176, 0,   106, 191, 221, 132, 143, 219, 94,  2,   235,
        204, 166, 201, 139, 140, 163, 104, 115, 48,  37,  18,  114, 168, 49,
        235, 163, 179, 131, 182, 218, 120, 200, 9,   90,  60,  47,  55,  235,
        135, 37,  21,  170, 48,  112, 185, 169, 43,  233, 88,  134, 117, 126,
        248, 40,  176, 248, 30,  131, 108, 43,  139, 68,  232, 219, 7,   39,
        223, 45,  199, 243, 54,  171, 31,  37,  161, 24,  38,  251, 13,  144,
        106, 215, 179, 203, 5,   253, 25,  32,  25,  146, 109, 193, 143, 141,
        177, 226, 134, 222, 95,  79,  156, 202, 240, 34,  153, 145, 169, 150,
        231, 63,  113, 242, 156, 39,  136, 249, 108, 50,  181, 22,  22,  180,
        57,  76,  69,  62,  254, 47,  141, 249, 235, 90,  25,  34,  40,  194,
        66,  86,  110, 192, 235, 191, 205, 133, 91,  32,  104, 65,  43,  36,
        140, 36,  228, 156, 105, 251, 169, 168, 203, 189, 238, 221, 64,  200,
        68,  137, 153, 9,   183, 84,  153, 140, 239, 0,   15,  50,  126, 145,
        22,  110, 43,  56,  94,  127, 48,  96,  47,  172, 3,   31,  130, 249,
        243, 73,  206, 89,  9,   93,  156, 167, 205, 166, 75,  227, 36,  34,
        81,  124, 195, 246, 152};
    static_assert(std::size(kDataLong) > 256, "too short");
    CRYPT_ArcFourCrypt(&context, data_long);
    EXPECT_THAT(data_long, ElementsAreArray(kExpectedEncryptedDataLong));

    static const uint8_t kPermutation[CRYPT_rc4_context::kPermutationLength] = {
        188, 12,  81,  130, 228, 58,  124, 218, 72,  210, 50,  70,  166, 38,
        110, 111, 73,  49,  27,  227, 249, 21,  1,   226, 17,  54,  53,  16,
        108, 51,  31,  123, 221, 23,  125, 148, 5,   200, 208, 246, 253, 193,
        42,  45,  236, 56,  230, 194, 178, 213, 120, 116, 7,   164, 33,  107,
        189, 20,  133, 114, 173, 161, 59,  128, 3,   238, 65,  69,  144, 179,
        44,  35,  8,   163, 252, 195, 160, 197, 204, 28,  34,  129, 67,  89,
        22,  149, 199, 131, 182, 46,  250, 222, 155, 104, 10,  32,  139, 245,
        90,  41,  132, 224, 83,  242, 135, 75,  74,  61,  62,  141, 43,  127,
        255, 91,  170, 78,  157, 101, 243, 216, 254, 156, 229, 118, 174, 147,
        103, 76,  196, 145, 134, 94,  205, 146, 202, 98,  100, 106, 232, 177,
        187, 13,  80,  137, 151, 11,  82,  40,  167, 175, 25,  219, 168, 240,
        99,  55,  4,   19,  180, 2,   203, 18,  171, 154, 113, 117, 6,   185,
        172, 186, 237, 223, 233, 244, 217, 191, 190, 198, 97,  165, 220, 9,
        214, 150, 184, 143, 206, 24,  209, 207, 36,  142, 87,  15,  159, 71,
        84,  162, 169, 86,  48,  47,  140, 215, 241, 235, 158, 14,  26,  248,
        138, 119, 212, 39,  88,  121, 96,  109, 29,  66,  136, 102, 225, 92,
        201, 126, 122, 192, 60,  0,   64,  239, 183, 37,  57,  63,  234, 181,
        153, 52,  176, 112, 93,  79,  77,  115, 231, 30,  95,  251, 211, 68,
        105, 85,  247, 152};
    CheckArcFourContext(context, 15, 68, kPermutation);
  }
}

TEST(FXCRYPT, Sha384Empty) {
  static const char kInput[] = "";
  DataVector<uint8_t> actual =
      CRYPT_SHA384Generate(ByteStringView(kInput).unsigned_span());
  EXPECT_THAT(
      actual,
      ElementsAre(0x38, 0xb0, 0x60, 0xa7, 0x51, 0xac, 0x96, 0x38, 0x4c, 0xd9,
                  0x32, 0x7e, 0xb1, 0xb1, 0xe3, 0x6a, 0x21, 0xfd, 0xb7, 0x11,
                  0x14, 0xbe, 0x07, 0x43, 0x4c, 0x0c, 0xc7, 0xbf, 0x63, 0xf6,
                  0xe1, 0xda, 0x27, 0x4e, 0xde, 0xbf, 0xe7, 0x6f, 0x65, 0xfb,
                  0xd5, 0x1a, 0xd2, 0xf1, 0x48, 0x98, 0xb9, 0x5b));
}

// Verified against echo -n "..." | openssl sha384
TEST(FXCRYPT, Sha384Test) {
  static const char kInput[] =
      "This is a simple test. To see whether it is getting correct value.";
  DataVector<uint8_t> actual =
      CRYPT_SHA384Generate(ByteStringView(kInput).unsigned_span());
  EXPECT_THAT(
      actual,
      ElementsAre(0x95, 0x54, 0xff, 0xd3, 0x89, 0xf0, 0xd6, 0x42, 0xe9, 0x33,
                  0xfe, 0x4c, 0x07, 0x81, 0x19, 0xca, 0xcb, 0xb3, 0x14, 0x46,
                  0xd8, 0xbd, 0xa4, 0xf4, 0x12, 0xd5, 0x54, 0x03, 0x79, 0x28,
                  0xe5, 0xdc, 0x12, 0xa5, 0x1b, 0xe9, 0xfe, 0x59, 0x25, 0x3c,
                  0x92, 0x30, 0x5e, 0xe5, 0x0e, 0x03, 0x58, 0x07));
}

// Verified against echo -n "..." | openssl sha384
TEST(FXCRYPT, Sha384Pad112) {
  static const char kInput[] =
      "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
      "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";
  EXPECT_EQ(112u, UNSAFE_TODO(strlen(kInput)));
  DataVector<uint8_t> actual =
      CRYPT_SHA384Generate(ByteStringView(kInput).unsigned_span());
  EXPECT_THAT(
      actual,
      ElementsAre(0x18, 0x7d, 0x4e, 0x07, 0xcb, 0x30, 0x61, 0x03, 0xc6, 0x99,
                  0x67, 0xbf, 0x54, 0x4d, 0x0d, 0xfb, 0xe9, 0x04, 0x25, 0x77,
                  0x59, 0x9c, 0x73, 0xc3, 0x30, 0xab, 0xc0, 0xcb, 0x64, 0xc6,
                  0x12, 0x36, 0xd5, 0xed, 0x56, 0x5e, 0xe1, 0x91, 0x19, 0xd8,
                  0xc3, 0x17, 0x79, 0xa3, 0x8f, 0x79, 0x1f, 0xcd));
}

TEST(FXCRYPT, Sha512Empty) {
  static const char kInput[] = "";
  DataVector<uint8_t> actual =
      CRYPT_SHA512Generate(ByteStringView(kInput).unsigned_span());
  EXPECT_THAT(
      actual,
      ElementsAre(0xcf, 0x83, 0xe1, 0x35, 0x7e, 0xef, 0xb8, 0xbd, 0xf1, 0x54,
                  0x28, 0x50, 0xd6, 0x6d, 0x80, 0x07, 0xd6, 0x20, 0xe4, 0x05,
                  0x0b, 0x57, 0x15, 0xdc, 0x83, 0xf4, 0xa9, 0x21, 0xd3, 0x6c,
                  0xe9, 0xce, 0x47, 0xd0, 0xd1, 0x3c, 0x5d, 0x85, 0xf2, 0xb0,
                  0xff, 0x83, 0x18, 0xd2, 0x87, 0x7e, 0xec, 0x2f, 0x63, 0xb9,
                  0x31, 0xbd, 0x47, 0x41, 0x7a, 0x81, 0xa5, 0x38, 0x32, 0x7a,
                  0xf9, 0x27, 0xda, 0x3e));
}

// Verified against echo -n "..." | openssl sha512
TEST(FXCRYPT, Sha512Test) {
  static const char kInput[] =
      "This is a simple test. To see whether it is getting correct value.";
  DataVector<uint8_t> actual =
      CRYPT_SHA512Generate(ByteStringView(kInput).unsigned_span());
  EXPECT_THAT(
      actual,
      ElementsAre(0x86, 0xB5, 0x05, 0x63, 0xA2, 0x6F, 0xD6, 0xFA, 0xEB, 0x9B,
                  0xC3, 0xBB, 0x9E, 0xB7, 0x03, 0x82, 0xB6, 0x50, 0x55, 0x6B,
                  0x90, 0x69, 0xD0, 0xA7, 0x53, 0x0A, 0x34, 0xDD, 0xEA, 0x11,
                  0xCC, 0x91, 0x5C, 0xC7, 0x93, 0xCA, 0xAE, 0x30, 0xD1, 0x96,
                  0xBE, 0xD0, 0x35, 0x21, 0x4A, 0xC6, 0x42, 0x56, 0x0C, 0xA3,
                  0x00, 0x69, 0x44, 0x77, 0xCC, 0x3E, 0xD4, 0xD6, 0x10, 0x31,
                  0xC6, 0xC0, 0x58, 0xCF));
}

// Verified against echo -n "..." | openssl sha512
TEST(FXCRYPT, Sha512Pad112) {
  static const char kInput[] =
      "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
      "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";
  EXPECT_EQ(112u, UNSAFE_TODO(strlen(kInput)));
  DataVector<uint8_t> actual =
      CRYPT_SHA512Generate(ByteStringView(kInput).unsigned_span());
  EXPECT_THAT(
      actual,
      ElementsAre(0xc0, 0x1d, 0x08, 0x0e, 0xfd, 0x49, 0x27, 0x76, 0xa1, 0xc4,
                  0x3b, 0xd2, 0x3d, 0xd9, 0x9d, 0x0a, 0x2e, 0x62, 0x6d, 0x48,
                  0x1e, 0x16, 0x78, 0x2e, 0x75, 0xd5, 0x4c, 0x25, 0x03, 0xb5,
                  0xdc, 0x32, 0xbd, 0x05, 0xf0, 0xf1, 0xba, 0x33, 0xe5, 0x68,
                  0xb8, 0x8f, 0xd2, 0xd9, 0x70, 0x92, 0x9b, 0x71, 0x9e, 0xcb,
                  0xb1, 0x52, 0xf5, 0x8f, 0x13, 0x0a, 0x40, 0x7c, 0x88, 0x30,
                  0x60, 0x4b, 0x70, 0xca));
}

// The tuple contains: Key, IV, Plaintext, Expected Ciphertext
using AESTestParams =
    std::tuple<const char*, const char*, const char*, const char*>;

class AESTest : public ::testing::TestWithParam<AESTestParams> {
 protected:
  void SetUp() override {
    auto [key_hex, iv_hex, plaintext_hex, ciphertext_hex] = GetParam();
    key_ = HexToBytes(key_hex);
    iv_ = HexToBytes(iv_hex);
    plaintext_ = HexToBytes(plaintext_hex);
    expected_ciphertext_ = HexToBytes(ciphertext_hex);
  }

  std::vector<uint8_t> key_;
  std::vector<uint8_t> iv_;
  std::vector<uint8_t> plaintext_;
  std::vector<uint8_t> expected_ciphertext_;
  CRYPT_aes_context encrypt_ctx_ = {};
  CRYPT_aes_context decrypt_ctx_ = {};
};

TEST_P(AESTest, EncryptDecryptRoundtrip) {
  std::vector<uint8_t> actual_ciphertext(plaintext_.size());
  std::vector<uint8_t> decrypted_plaintext(expected_ciphertext_.size());

  CRYPT_AESSetKey(&encrypt_ctx_, key_);
  CRYPT_AESSetIV(&encrypt_ctx_, pdfium::span(iv_).first<16u>());
  CRYPT_AESEncrypt(&encrypt_ctx_, actual_ciphertext, plaintext_);
  ASSERT_EQ(actual_ciphertext, expected_ciphertext_);

  CRYPT_AESSetKey(&decrypt_ctx_, key_);
  CRYPT_AESSetIV(&decrypt_ctx_, pdfium::span(iv_).first<16u>());
  CRYPT_AESDecrypt(&decrypt_ctx_, decrypted_plaintext, expected_ciphertext_);
  EXPECT_EQ(decrypted_plaintext, plaintext_);
}

INSTANTIATE_TEST_SUITE_P(
    AES128,
    AESTest,
    ::testing::Values(
        // See third_party/boringssl/src/crypto/cipher/test/cipher_tests.txt
        AESTestParams{
            "2b7e151628aed2a6abf7158809cf4f3c",
            "000102030405060708090a0b0c0d0e0f",
            "6bc1bee22e409f96e93d7e117393172a",
            "7649abac8119b246cee98e9b12e9197d",
        },
        AESTestParams{
            "2b7e151628aed2a6abf7158809cf4f3c",
            "7649abac8119b246cee98e9b12e9197d",
            "ae2d8a571e03ac9c9eb76fac45af8e51",
            "5086cb9b507219ee95db113a917678b2",
        },
        AESTestParams{
            "2b7e151628aed2a6abf7158809cf4f3c",
            "5086cb9b507219ee95db113a917678b2",
            "30c81c46a35ce411e5fbc1191a0a52ef",
            "73bed6b8e3c1743b7116e69e22229516",
        },
        AESTestParams{
            "2b7e151628aed2a6abf7158809cf4f3c",
            "73bed6b8e3c1743b7116e69e22229516",
            "f69f2445df4f9b17ad2b417be66c3710",
            "3ff1caa1681fac09120eca307586e1a7",
        }));

INSTANTIATE_TEST_SUITE_P(
    AES192,
    AESTest,
    ::testing::Values(
        // See third_party/boringssl/src/crypto/cipher/test/cipher_tests.txt
        AESTestParams{
            "8e73b0f7da0e6452c810f32b809079e562f8ead2522c6b7b",
            "000102030405060708090a0b0c0d0e0f",
            "6bc1bee22e409f96e93d7e117393172a",
            "4f021db243bc633d7178183a9fa071e8",

        },
        AESTestParams{
            "8e73b0f7da0e6452c810f32b809079e562f8ead2522c6b7b",
            "4f021db243bc633d7178183a9fa071e8",
            "ae2d8a571e03ac9c9eb76fac45af8e51",
            "b4d9ada9ad7dedf4e5e738763f69145a",

        },
        AESTestParams{
            "8e73b0f7da0e6452c810f32b809079e562f8ead2522c6b7b",
            "b4d9ada9ad7dedf4e5e738763f69145a",
            "30c81c46a35ce411e5fbc1191a0a52ef",
            "571b242012fb7ae07fa9baac3df102e0",

        },
        AESTestParams{
            "8e73b0f7da0e6452c810f32b809079e562f8ead2522c6b7b",
            "571b242012fb7ae07fa9baac3df102e0",
            "f69f2445df4f9b17ad2b417be66c3710",
            "08b0e27988598881d920a9e64f5615cd",
        }));

INSTANTIATE_TEST_SUITE_P(
    AES256,
    AESTest,
    ::testing::Values(
        // See third_party/boringssl/src/crypto/cipher/test/cipher_tests.txt
        AESTestParams{
            "603deb1015ca71be2b73aef0857d77811f352c073b6108d72d9810a30914dff4",
            "000102030405060708090a0b0c0d0e0f",
            "6bc1bee22e409f96e93d7e117393172a",
            "f58c4c04d6e5f1ba779eabfb5f7bfbd6",
        },
        AESTestParams{
            "603deb1015ca71be2b73aef0857d77811f352c073b6108d72d9810a30914dff4",
            "f58c4c04d6e5f1ba779eabfb5f7bfbd6",
            "ae2d8a571e03ac9c9eb76fac45af8e51",
            "9cfc4e967edb808d679f777bc6702c7d",
        },
        AESTestParams{
            "603deb1015ca71be2b73aef0857d77811f352c073b6108d72d9810a30914dff4",
            "9cfc4e967edb808d679f777bc6702c7d",
            "30c81c46a35ce411e5fbc1191a0a52ef",
            "39f23369a9d9bacfa530e26304231461",
        },
        AESTestParams{
            "603deb1015ca71be2b73aef0857d77811f352c073b6108d72d9810a30914dff4",
            "39f23369a9d9bacfa530e26304231461",
            "f69f2445df4f9b17ad2b417be66c3710",
            "b2eb05e2c39be9fcda6c19078c6a9d1b",
        }));