crypto/encryptor_unittest.cc

   1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "crypto/encryptor.h"
   6
   7 #include <string>
   8
   9 #include "base/memory/scoped_ptr.h"
  10 #include "base/string_number_conversions.h"
  11 #include "crypto/symmetric_key.h"
  12 #include "testing/gtest/include/gtest/gtest.h"
  13
  14 TEST(EncryptorTest, EncryptDecrypt) {
  15   scoped_ptr<crypto::SymmetricKey> key(
  16       crypto::SymmetricKey::DeriveKeyFromPassword(
  17           crypto::SymmetricKey::AES, "password", "saltiest", 1000, 256));
  18   EXPECT_TRUE(NULL != key.get());
  19
  20   crypto::Encryptor encryptor;
  21   // The IV must be exactly as long as the cipher block size.
  22   std::string iv("the iv: 16 bytes");
  23   EXPECT_EQ(16U, iv.size());
  24   EXPECT_TRUE(encryptor.Init(key.get(), crypto::Encryptor::CBC, iv));
  25
  26   std::string plaintext("this is the plaintext");
  27   std::string ciphertext;
  28   EXPECT_TRUE(encryptor.Encrypt(plaintext, &ciphertext));
  29
  30   EXPECT_LT(0U, ciphertext.size());
  31
  32   std::string decypted;
  33   EXPECT_TRUE(encryptor.Decrypt(ciphertext, &decypted));
  34
  35   EXPECT_EQ(plaintext, decypted);
  36 }
  37
  38 // TODO(wtc): add more known-answer tests.  Test vectors are available from
  39 // http://www.ietf.org/rfc/rfc3602
  40 // http://csrc.nist.gov/publications/nistpubs/800-38a/sp800-38a.pdf
  41 // http://gladman.plushost.co.uk/oldsite/AES/index.php
  42 // http://csrc.nist.gov/groups/STM/cavp/documents/aes/KAT_AES.zip
  43
  44 // NIST SP 800-38A test vector F.2.5 CBC-AES256.Encrypt.
  45 TEST(EncryptorTest, EncryptAES256CBC) {
  46   // From NIST SP 800-38a test cast F.2.5 CBC-AES256.Encrypt.
  47   static const unsigned char raw_key[] = {
  48     0x60, 0x3d, 0xeb, 0x10, 0x15, 0xca, 0x71, 0xbe,
  49     0x2b, 0x73, 0xae, 0xf0, 0x85, 0x7d, 0x77, 0x81,
  50     0x1f, 0x35, 0x2c, 0x07, 0x3b, 0x61, 0x08, 0xd7,
  51     0x2d, 0x98, 0x10, 0xa3, 0x09, 0x14, 0xdf, 0xf4
  52   };
  53   static const unsigned char raw_iv[] = {
  54     0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
  55     0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f
  56   };
  57   static const unsigned char raw_plaintext[] = {
  58     // Block #1
  59     0x6b, 0xc1, 0xbe, 0xe2, 0x2e, 0x40, 0x9f, 0x96,
  60     0xe9, 0x3d, 0x7e, 0x11, 0x73, 0x93, 0x17, 0x2a,
  61     // Block #2
  62     0xae, 0x2d, 0x8a, 0x57, 0x1e, 0x03, 0xac, 0x9c,
  63     0x9e, 0xb7, 0x6f, 0xac, 0x45, 0xaf, 0x8e, 0x51,
  64     // Block #3
  65     0x30, 0xc8, 0x1c, 0x46, 0xa3, 0x5c, 0xe4, 0x11,
  66     0xe5, 0xfb, 0xc1, 0x19, 0x1a, 0x0a, 0x52, 0xef,
  67     // Block #4
  68     0xf6, 0x9f, 0x24, 0x45, 0xdf, 0x4f, 0x9b, 0x17,
  69     0xad, 0x2b, 0x41, 0x7b, 0xe6, 0x6c, 0x37, 0x10,
  70   };
  71   static const unsigned char raw_ciphertext[] = {
  72     // Block #1
  73     0xf5, 0x8c, 0x4c, 0x04, 0xd6, 0xe5, 0xf1, 0xba,
  74     0x77, 0x9e, 0xab, 0xfb, 0x5f, 0x7b, 0xfb, 0xd6,
  75     // Block #2
  76     0x9c, 0xfc, 0x4e, 0x96, 0x7e, 0xdb, 0x80, 0x8d,
  77     0x67, 0x9f, 0x77, 0x7b, 0xc6, 0x70, 0x2c, 0x7d,
  78     // Block #3
  79     0x39, 0xf2, 0x33, 0x69, 0xa9, 0xd9, 0xba, 0xcf,
  80     0xa5, 0x30, 0xe2, 0x63, 0x04, 0x23, 0x14, 0x61,
  81     // Block #4
  82     0xb2, 0xeb, 0x05, 0xe2, 0xc3, 0x9b, 0xe9, 0xfc,
  83     0xda, 0x6c, 0x19, 0x07, 0x8c, 0x6a, 0x9d, 0x1b,
  84     // PKCS #5 padding, encrypted.
  85     0x3f, 0x46, 0x17, 0x96, 0xd6, 0xb0, 0xd6, 0xb2,
  86     0xe0, 0xc2, 0xa7, 0x2b, 0x4d, 0x80, 0xe6, 0x44
  87   };
  88
  89   std::string key(reinterpret_cast<const char*>(raw_key), sizeof(raw_key));
  90   scoped_ptr<crypto::SymmetricKey> sym_key(crypto::SymmetricKey::Import(
  91       crypto::SymmetricKey::AES, key));
  92   ASSERT_TRUE(NULL != sym_key.get());
  93
  94   crypto::Encryptor encryptor;
  95   // The IV must be exactly as long a the cipher block size.
  96   std::string iv(reinterpret_cast<const char*>(raw_iv), sizeof(raw_iv));
  97   EXPECT_EQ(16U, iv.size());
  98   EXPECT_TRUE(encryptor.Init(sym_key.get(), crypto::Encryptor::CBC, iv));
  99
 100   std::string plaintext(reinterpret_cast<const char*>(raw_plaintext),
 101                         sizeof(raw_plaintext));
 102   std::string ciphertext;
 103   EXPECT_TRUE(encryptor.Encrypt(plaintext, &ciphertext));
 104
 105   EXPECT_EQ(sizeof(raw_ciphertext), ciphertext.size());
 106   EXPECT_EQ(0, memcmp(ciphertext.data(), raw_ciphertext, ciphertext.size()));
 107
 108   std::string decypted;
 109   EXPECT_TRUE(encryptor.Decrypt(ciphertext, &decypted));
 110
 111   EXPECT_EQ(plaintext, decypted);
 112 }
 113
 114 // Expected output derived from the NSS implementation.
 115 TEST(EncryptorTest, EncryptAES128CBCRegression) {
 116   std::string key = "128=SixteenBytes";
 117   std::string iv = "Sweet Sixteen IV";
 118   std::string plaintext = "Plain text with a g-clef U+1D11E \360\235\204\236";
 119   std::string expected_ciphertext_hex =
 120       "D4A67A0BA33C30F207344D81D1E944BBE65587C3D7D9939A"
 121       "C070C62B9C15A3EA312EA4AD1BC7929F4D3C16B03AD5ADA8";
 122
 123   scoped_ptr<crypto::SymmetricKey> sym_key(crypto::SymmetricKey::Import(
 124       crypto::SymmetricKey::AES, key));
 125   ASSERT_TRUE(NULL != sym_key.get());
 126
 127   crypto::Encryptor encryptor;
 128   // The IV must be exactly as long a the cipher block size.
 129   EXPECT_EQ(16U, iv.size());
 130   EXPECT_TRUE(encryptor.Init(sym_key.get(), crypto::Encryptor::CBC, iv));
 131
 132   std::string ciphertext;
 133   EXPECT_TRUE(encryptor.Encrypt(plaintext, &ciphertext));
 134   EXPECT_EQ(expected_ciphertext_hex, base::HexEncode(ciphertext.data(),
 135                                                      ciphertext.size()));
 136
 137   std::string decypted;
 138   EXPECT_TRUE(encryptor.Decrypt(ciphertext, &decypted));
 139   EXPECT_EQ(plaintext, decypted);
 140 }
 141
 142 // Expected output derived from the NSS implementation.
 143 TEST(EncryptorTest, EncryptAES192CBCRegression) {
 144   std::string key = "192bitsIsTwentyFourByte!";
 145   std::string iv = "Sweet Sixteen IV";
 146   std::string plaintext = "Small text";
 147   std::string expected_ciphertext_hex = "78DE5D7C2714FC5C61346C5416F6C89A";
 148
 149   scoped_ptr<crypto::SymmetricKey> sym_key(crypto::SymmetricKey::Import(
 150       crypto::SymmetricKey::AES, key));
 151   ASSERT_TRUE(NULL != sym_key.get());
 152
 153   crypto::Encryptor encryptor;
 154   // The IV must be exactly as long a the cipher block size.
 155   EXPECT_EQ(16U, iv.size());
 156   EXPECT_TRUE(encryptor.Init(sym_key.get(), crypto::Encryptor::CBC, iv));
 157
 158   std::string ciphertext;
 159   EXPECT_TRUE(encryptor.Encrypt(plaintext, &ciphertext));
 160   EXPECT_EQ(expected_ciphertext_hex, base::HexEncode(ciphertext.data(),
 161                                                      ciphertext.size()));
 162
 163   std::string decypted;
 164   EXPECT_TRUE(encryptor.Decrypt(ciphertext, &decypted));
 165   EXPECT_EQ(plaintext, decypted);
 166 }
 167
 168 // Not all platforms allow import/generation of symmetric keys with an
 169 // unsupported size.
 170 #if !defined(OS_WIN) && !defined(USE_NSS)
 171 TEST(EncryptorTest, UnsupportedKeySize) {
 172   std::string key = "7 = bad";
 173   std::string iv = "Sweet Sixteen IV";
 174   scoped_ptr<crypto::SymmetricKey> sym_key(crypto::SymmetricKey::Import(
 175       crypto::SymmetricKey::AES, key));
 176   ASSERT_TRUE(NULL != sym_key.get());
 177
 178   crypto::Encryptor encryptor;
 179   // The IV must be exactly as long a the cipher block size.
 180   EXPECT_EQ(16U, iv.size());
 181   EXPECT_FALSE(encryptor.Init(sym_key.get(), crypto::Encryptor::CBC, iv));
 182 }
 183 #endif  // unsupported platforms.
 184
 185 TEST(EncryptorTest, UnsupportedIV) {
 186   std::string key = "128=SixteenBytes";
 187   std::string iv = "OnlyForteen :(";
 188   scoped_ptr<crypto::SymmetricKey> sym_key(crypto::SymmetricKey::Import(
 189       crypto::SymmetricKey::AES, key));
 190   ASSERT_TRUE(NULL != sym_key.get());
 191
 192   crypto::Encryptor encryptor;
 193   EXPECT_FALSE(encryptor.Init(sym_key.get(), crypto::Encryptor::CBC, iv));
 194 }
 195
 196 TEST(EncryptorTest, EmptyEncrypt) {
 197   std::string key = "128=SixteenBytes";
 198   std::string iv = "Sweet Sixteen IV";
 199   std::string plaintext;
 200   std::string expected_ciphertext_hex = "8518B8878D34E7185E300D0FCC426396";
 201
 202   scoped_ptr<crypto::SymmetricKey> sym_key(crypto::SymmetricKey::Import(
 203       crypto::SymmetricKey::AES, key));
 204   ASSERT_TRUE(NULL != sym_key.get());
 205
 206   crypto::Encryptor encryptor;
 207   // The IV must be exactly as long a the cipher block size.
 208   EXPECT_EQ(16U, iv.size());
 209   EXPECT_TRUE(encryptor.Init(sym_key.get(), crypto::Encryptor::CBC, iv));
 210
 211   std::string ciphertext;
 212   EXPECT_TRUE(encryptor.Encrypt(plaintext, &ciphertext));
 213   EXPECT_EQ(expected_ciphertext_hex, base::HexEncode(ciphertext.data(),
 214                                                      ciphertext.size()));
 215 }
 216
 217 TEST(EncryptorTest, EmptyDecrypt) {
 218   std::string key = "128=SixteenBytes";
 219   std::string iv = "Sweet Sixteen IV";
 220
 221   scoped_ptr<crypto::SymmetricKey> sym_key(crypto::SymmetricKey::Import(
 222       crypto::SymmetricKey::AES, key));
 223   ASSERT_TRUE(NULL != sym_key.get());
 224
 225   crypto::Encryptor encryptor;
 226   // The IV must be exactly as long a the cipher block size.
 227   EXPECT_EQ(16U, iv.size());
 228   EXPECT_TRUE(encryptor.Init(sym_key.get(), crypto::Encryptor::CBC, iv));
 229
 230   std::string decrypted;
 231   EXPECT_FALSE(encryptor.Decrypt("", &decrypted));
 232   EXPECT_EQ("", decrypted);
 233 }