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encryptor_unittest.cc
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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "crypto/encryptor.h"
#include <string>
#include "base/memory/scoped_ptr.h"
#include "base/string_number_conversions.h"
#include "crypto/symmetric_key.h"
#include "testing/gtest/include/gtest/gtest.h"
TEST(EncryptorTest, EncryptDecrypt) {
scoped_ptr<crypto::SymmetricKey> key(
crypto::SymmetricKey::DeriveKeyFromPassword(
crypto::SymmetricKey::AES, "password", "saltiest", 1000, 256));
EXPECT_TRUE(NULL != key.get());
crypto::Encryptor encryptor;
// The IV must be exactly as long as the cipher block size.
std::string iv("the iv: 16 bytes");
EXPECT_EQ(16U, iv.size());
EXPECT_TRUE(encryptor.Init(key.get(), crypto::Encryptor::CBC, iv));
std::string plaintext("this is the plaintext");
std::string ciphertext;
EXPECT_TRUE(encryptor.Encrypt(plaintext, &ciphertext));
EXPECT_LT(0U, ciphertext.size());
std::string decypted;
EXPECT_TRUE(encryptor.Decrypt(ciphertext, &decypted));
EXPECT_EQ(plaintext, decypted);
}
TEST(EncryptorTest, DecryptWrongKey) {
scoped_ptr<crypto::SymmetricKey> key(
crypto::SymmetricKey::DeriveKeyFromPassword(
crypto::SymmetricKey::AES, "password", "saltiest", 1000, 256));
EXPECT_TRUE(NULL != key.get());
scoped_ptr<crypto::SymmetricKey> wrong_key(
crypto::SymmetricKey::DeriveKeyFromPassword(
crypto::SymmetricKey::AES, "wrongword", "sweetest", 1000, 256));
EXPECT_TRUE(NULL != wrong_key.get());
crypto::Encryptor encryptor;
// The IV must be exactly as long as the cipher block size.
std::string iv("the iv: 16 bytes");
EXPECT_EQ(16U, iv.size());
EXPECT_TRUE(encryptor.Init(key.get(), crypto::Encryptor::CBC, iv));
std::string plaintext("this is the plaintext");
std::string ciphertext;
EXPECT_TRUE(encryptor.Encrypt(plaintext, &ciphertext));
static const unsigned char expected_ciphertext[] = {
0x7D, 0x67, 0x5B, 0x53, 0xE6, 0xD8, 0x0F, 0x27,
0x74, 0xB1, 0x90, 0xFE, 0x6E, 0x58, 0x4A, 0xA0,
0x0E, 0x35, 0xE3, 0x01, 0xC0, 0xFE, 0x9A, 0xD8,
0x48, 0x1D, 0x42, 0xB0, 0xBA, 0x21, 0xB2, 0x0C
};
ASSERT_EQ(arraysize(expected_ciphertext), ciphertext.size());
for (size_t i = 0; i < ciphertext.size(); ++i) {
ASSERT_EQ(expected_ciphertext[i],
static_cast<unsigned char>(ciphertext[i]));
}
crypto::Encryptor decryptor;
EXPECT_TRUE(decryptor.Init(wrong_key.get(), crypto::Encryptor::CBC, iv));
std::string decypted;
// TODO(wtc): On Linux, Encryptor::Decrypt() doesn't always return false when
// wrong key is provided. See crbug.com/124434. Remove #if when bug is fixed.
#if !defined(USE_NSS)
EXPECT_FALSE(decryptor.Decrypt(ciphertext, &decypted));
#endif
}
// CTR mode encryption is only implemented using NSS.
#if defined(USE_NSS)
TEST(EncryptorTest, EncryptDecryptCTR) {
scoped_ptr<crypto::SymmetricKey> key(
crypto::SymmetricKey::GenerateRandomKey(
crypto::SymmetricKey::AES, 128));
EXPECT_TRUE(NULL != key.get());
const std::string kInitialCounter = "0000000000000000";
crypto::Encryptor encryptor;
EXPECT_TRUE(encryptor.Init(key.get(), crypto::Encryptor::CTR, ""));
EXPECT_TRUE(encryptor.SetCounter(kInitialCounter));
std::string plaintext("normal plaintext of random length");
std::string ciphertext;
EXPECT_TRUE(encryptor.Encrypt(plaintext, &ciphertext));
EXPECT_LT(0U, ciphertext.size());
std::string decypted;
EXPECT_TRUE(encryptor.SetCounter(kInitialCounter));
EXPECT_TRUE(encryptor.Decrypt(ciphertext, &decypted));
EXPECT_EQ(plaintext, decypted);
plaintext = "0123456789012345";
EXPECT_TRUE(encryptor.SetCounter(kInitialCounter));
EXPECT_TRUE(encryptor.Encrypt(plaintext, &ciphertext));
EXPECT_LT(0U, ciphertext.size());
EXPECT_TRUE(encryptor.SetCounter(kInitialCounter));
EXPECT_TRUE(encryptor.Decrypt(ciphertext, &decypted));
EXPECT_EQ(plaintext, decypted);
}
TEST(EncryptorTest, CTRCounter) {
const int kCounterSize = 16;
const char kTest1[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
uint8 buf[16];
// Increment 10 times.
crypto::Encryptor::Counter counter1(std::string(kTest1, kCounterSize));
for (int i = 0; i < 10; ++i)
counter1.Increment();
counter1.Write(buf);
EXPECT_EQ(0, memcmp(buf, kTest1, 15));
EXPECT_TRUE(buf[15] == 10);
// Check corner cases.
const char kTest2[] = {0, 0, 0, 0, 0, 0, 0, 0,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
const char kExpect2[] = {0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0};
crypto::Encryptor::Counter counter2(std::string(kTest2, kCounterSize));
counter2.Increment();
counter2.Write(buf);
EXPECT_EQ(0, memcmp(buf, kExpect2, kCounterSize));
const char kTest3[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
const char kExpect3[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
crypto::Encryptor::Counter counter3(std::string(kTest3, kCounterSize));
counter3.Increment();
counter3.Write(buf);
EXPECT_EQ(0, memcmp(buf, kExpect3, kCounterSize));
}
#endif
// TODO(wtc): add more known-answer tests. Test vectors are available from
// http://www.ietf.org/rfc/rfc3602
// http://csrc.nist.gov/publications/nistpubs/800-38a/sp800-38a.pdf
// http://gladman.plushost.co.uk/oldsite/AES/index.php
// http://csrc.nist.gov/groups/STM/cavp/documents/aes/KAT_AES.zip
// NIST SP 800-38A test vector F.2.5 CBC-AES256.Encrypt.
TEST(EncryptorTest, EncryptAES256CBC) {
// From NIST SP 800-38a test cast F.2.5 CBC-AES256.Encrypt.
static const unsigned char raw_key[] = {
0x60, 0x3d, 0xeb, 0x10, 0x15, 0xca, 0x71, 0xbe,
0x2b, 0x73, 0xae, 0xf0, 0x85, 0x7d, 0x77, 0x81,
0x1f, 0x35, 0x2c, 0x07, 0x3b, 0x61, 0x08, 0xd7,
0x2d, 0x98, 0x10, 0xa3, 0x09, 0x14, 0xdf, 0xf4
};
static const unsigned char raw_iv[] = {
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f
};
static const unsigned char raw_plaintext[] = {
// Block #1
0x6b, 0xc1, 0xbe, 0xe2, 0x2e, 0x40, 0x9f, 0x96,
0xe9, 0x3d, 0x7e, 0x11, 0x73, 0x93, 0x17, 0x2a,
// Block #2
0xae, 0x2d, 0x8a, 0x57, 0x1e, 0x03, 0xac, 0x9c,
0x9e, 0xb7, 0x6f, 0xac, 0x45, 0xaf, 0x8e, 0x51,
// Block #3
0x30, 0xc8, 0x1c, 0x46, 0xa3, 0x5c, 0xe4, 0x11,
0xe5, 0xfb, 0xc1, 0x19, 0x1a, 0x0a, 0x52, 0xef,
// Block #4
0xf6, 0x9f, 0x24, 0x45, 0xdf, 0x4f, 0x9b, 0x17,
0xad, 0x2b, 0x41, 0x7b, 0xe6, 0x6c, 0x37, 0x10,
};
static const unsigned char raw_ciphertext[] = {
// Block #1
0xf5, 0x8c, 0x4c, 0x04, 0xd6, 0xe5, 0xf1, 0xba,
0x77, 0x9e, 0xab, 0xfb, 0x5f, 0x7b, 0xfb, 0xd6,
// Block #2
0x9c, 0xfc, 0x4e, 0x96, 0x7e, 0xdb, 0x80, 0x8d,
0x67, 0x9f, 0x77, 0x7b, 0xc6, 0x70, 0x2c, 0x7d,
// Block #3
0x39, 0xf2, 0x33, 0x69, 0xa9, 0xd9, 0xba, 0xcf,
0xa5, 0x30, 0xe2, 0x63, 0x04, 0x23, 0x14, 0x61,
// Block #4
0xb2, 0xeb, 0x05, 0xe2, 0xc3, 0x9b, 0xe9, 0xfc,
0xda, 0x6c, 0x19, 0x07, 0x8c, 0x6a, 0x9d, 0x1b,
// PKCS #5 padding, encrypted.
0x3f, 0x46, 0x17, 0x96, 0xd6, 0xb0, 0xd6, 0xb2,
0xe0, 0xc2, 0xa7, 0x2b, 0x4d, 0x80, 0xe6, 0x44
};
std::string key(reinterpret_cast<const char*>(raw_key), sizeof(raw_key));
scoped_ptr<crypto::SymmetricKey> sym_key(crypto::SymmetricKey::Import(
crypto::SymmetricKey::AES, key));
ASSERT_TRUE(NULL != sym_key.get());
crypto::Encryptor encryptor;
// The IV must be exactly as long a the cipher block size.
std::string iv(reinterpret_cast<const char*>(raw_iv), sizeof(raw_iv));
EXPECT_EQ(16U, iv.size());
EXPECT_TRUE(encryptor.Init(sym_key.get(), crypto::Encryptor::CBC, iv));
std::string plaintext(reinterpret_cast<const char*>(raw_plaintext),
sizeof(raw_plaintext));
std::string ciphertext;
EXPECT_TRUE(encryptor.Encrypt(plaintext, &ciphertext));
EXPECT_EQ(sizeof(raw_ciphertext), ciphertext.size());
EXPECT_EQ(0, memcmp(ciphertext.data(), raw_ciphertext, ciphertext.size()));
std::string decypted;
EXPECT_TRUE(encryptor.Decrypt(ciphertext, &decypted));
EXPECT_EQ(plaintext, decypted);
}
// Expected output derived from the NSS implementation.
TEST(EncryptorTest, EncryptAES128CBCRegression) {
std::string key = "128=SixteenBytes";
std::string iv = "Sweet Sixteen IV";
std::string plaintext = "Plain text with a g-clef U+1D11E \360\235\204\236";
std::string expected_ciphertext_hex =
"D4A67A0BA33C30F207344D81D1E944BBE65587C3D7D9939A"
"C070C62B9C15A3EA312EA4AD1BC7929F4D3C16B03AD5ADA8";
scoped_ptr<crypto::SymmetricKey> sym_key(crypto::SymmetricKey::Import(
crypto::SymmetricKey::AES, key));
ASSERT_TRUE(NULL != sym_key.get());
crypto::Encryptor encryptor;
// The IV must be exactly as long a the cipher block size.
EXPECT_EQ(16U, iv.size());
EXPECT_TRUE(encryptor.Init(sym_key.get(), crypto::Encryptor::CBC, iv));
std::string ciphertext;
EXPECT_TRUE(encryptor.Encrypt(plaintext, &ciphertext));
EXPECT_EQ(expected_ciphertext_hex, base::HexEncode(ciphertext.data(),
ciphertext.size()));
std::string decypted;
EXPECT_TRUE(encryptor.Decrypt(ciphertext, &decypted));
EXPECT_EQ(plaintext, decypted);
}
// Expected output derived from the NSS implementation.
TEST(EncryptorTest, EncryptAES192CBCRegression) {
std::string key = "192bitsIsTwentyFourByte!";
std::string iv = "Sweet Sixteen IV";
std::string plaintext = "Small text";
std::string expected_ciphertext_hex = "78DE5D7C2714FC5C61346C5416F6C89A";
scoped_ptr<crypto::SymmetricKey> sym_key(crypto::SymmetricKey::Import(
crypto::SymmetricKey::AES, key));
ASSERT_TRUE(NULL != sym_key.get());
crypto::Encryptor encryptor;
// The IV must be exactly as long a the cipher block size.
EXPECT_EQ(16U, iv.size());
EXPECT_TRUE(encryptor.Init(sym_key.get(), crypto::Encryptor::CBC, iv));
std::string ciphertext;
EXPECT_TRUE(encryptor.Encrypt(plaintext, &ciphertext));
EXPECT_EQ(expected_ciphertext_hex, base::HexEncode(ciphertext.data(),
ciphertext.size()));
std::string decypted;
EXPECT_TRUE(encryptor.Decrypt(ciphertext, &decypted));
EXPECT_EQ(plaintext, decypted);
}
// Not all platforms allow import/generation of symmetric keys with an
// unsupported size.
#if !defined(OS_WIN) && !defined(USE_NSS)
TEST(EncryptorTest, UnsupportedKeySize) {
std::string key = "7 = bad";
std::string iv = "Sweet Sixteen IV";
scoped_ptr<crypto::SymmetricKey> sym_key(crypto::SymmetricKey::Import(
crypto::SymmetricKey::AES, key));
ASSERT_TRUE(NULL != sym_key.get());
crypto::Encryptor encryptor;
// The IV must be exactly as long a the cipher block size.
EXPECT_EQ(16U, iv.size());
EXPECT_FALSE(encryptor.Init(sym_key.get(), crypto::Encryptor::CBC, iv));
}
#endif // unsupported platforms.
TEST(EncryptorTest, UnsupportedIV) {
std::string key = "128=SixteenBytes";
std::string iv = "OnlyForteen :(";
scoped_ptr<crypto::SymmetricKey> sym_key(crypto::SymmetricKey::Import(
crypto::SymmetricKey::AES, key));
ASSERT_TRUE(NULL != sym_key.get());
crypto::Encryptor encryptor;
EXPECT_FALSE(encryptor.Init(sym_key.get(), crypto::Encryptor::CBC, iv));
}
TEST(EncryptorTest, EmptyEncrypt) {
std::string key = "128=SixteenBytes";
std::string iv = "Sweet Sixteen IV";
std::string plaintext;
std::string expected_ciphertext_hex = "8518B8878D34E7185E300D0FCC426396";
scoped_ptr<crypto::SymmetricKey> sym_key(crypto::SymmetricKey::Import(
crypto::SymmetricKey::AES, key));
ASSERT_TRUE(NULL != sym_key.get());
crypto::Encryptor encryptor;
// The IV must be exactly as long a the cipher block size.
EXPECT_EQ(16U, iv.size());
EXPECT_TRUE(encryptor.Init(sym_key.get(), crypto::Encryptor::CBC, iv));
std::string ciphertext;
EXPECT_TRUE(encryptor.Encrypt(plaintext, &ciphertext));
EXPECT_EQ(expected_ciphertext_hex, base::HexEncode(ciphertext.data(),
ciphertext.size()));
}