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
14TEST(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.
45TEST(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.
115TEST(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.
143TEST(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)
171TEST(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
185TEST(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
196TEST(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
217TEST(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}
234