299 lines
11 KiB
C++
299 lines
11 KiB
C++
// Copyright (c) 2013 Google Inc. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "media/base/aes_encryptor.h"
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#include "base/logging.h"
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#include "base/memory/scoped_ptr.h"
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#include "base/strings/string_number_conversions.h"
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#include "testing/gtest/include/gtest/gtest.h"
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namespace {
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const uint32 kAesBlockSize = 16;
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// From NIST SP 800-38a test case: - F.5.1 CTR-AES128.Encrypt
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// http://csrc.nist.gov/publications/nistpubs/800-38a/sp800-38a.pdf
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const uint8 kAesCtrKey[] = {0x2b, 0x7e, 0x15, 0x16, 0x28, 0xae, 0xd2, 0xa6,
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0xab, 0xf7, 0x15, 0x88, 0x09, 0xcf, 0x4f, 0x3c};
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const uint8 kAesCtrIv[] = {0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
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0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff};
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const uint8 kAesCtrPlaintext[] = {
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// Block #1
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0x6b, 0xc1, 0xbe, 0xe2, 0x2e, 0x40, 0x9f, 0x96,
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0xe9, 0x3d, 0x7e, 0x11, 0x73, 0x93, 0x17, 0x2a,
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// Block #2
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0xae, 0x2d, 0x8a, 0x57, 0x1e, 0x03, 0xac, 0x9c,
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0x9e, 0xb7, 0x6f, 0xac, 0x45, 0xaf, 0x8e, 0x51,
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// Block #3
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0x30, 0xc8, 0x1c, 0x46, 0xa3, 0x5c, 0xe4, 0x11,
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0xe5, 0xfb, 0xc1, 0x19, 0x1a, 0x0a, 0x52, 0xef,
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// Block #4
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0xf6, 0x9f, 0x24, 0x45, 0xdf, 0x4f, 0x9b, 0x17,
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0xad, 0x2b, 0x41, 0x7b, 0xe6, 0x6c, 0x37, 0x10};
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const uint8 kAesCtrCiphertext[] = {
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// Block #1
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0x87, 0x4d, 0x61, 0x91, 0xb6, 0x20, 0xe3, 0x26,
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0x1b, 0xef, 0x68, 0x64, 0x99, 0x0d, 0xb6, 0xce,
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// Block #2
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0x98, 0x06, 0xf6, 0x6b, 0x79, 0x70, 0xfd, 0xff,
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0x86, 0x17, 0x18, 0x7b, 0xb9, 0xff, 0xfd, 0xff,
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// Block #3
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0x5a, 0xe4, 0xdf, 0x3e, 0xdb, 0xd5, 0xd3, 0x5e,
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0x5b, 0x4f, 0x09, 0x02, 0x0d, 0xb0, 0x3e, 0xab,
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// Block #4
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0x1e, 0x03, 0x1d, 0xda, 0x2f, 0xbe, 0x03, 0xd1,
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0x79, 0x21, 0x70, 0xa0, 0xf3, 0x00, 0x9c, 0xee};
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// Subsample test cases.
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struct SubsampleTestCase {
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const uint8* subsample_sizes;
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uint32 subsample_count;
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};
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const uint8 kSubsampleTest1[] = {64};
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const uint8 kSubsampleTest2[] = {13, 51};
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const uint8 kSubsampleTest3[] = {52, 12};
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const uint8 kSubsampleTest4[] = {16, 48};
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const uint8 kSubsampleTest5[] = {3, 16, 45};
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const uint8 kSubsampleTest6[] = {18, 16, 34};
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const uint8 kSubsampleTest7[] = {8, 16, 2, 38};
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const uint8 kSubsampleTest8[] = {10, 1, 33, 20};
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const uint8 kSubsampleTest9[] = {7, 19, 6, 32};
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const uint8 kSubsampleTest10[] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 9};
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const SubsampleTestCase kSubsampleTestCases[] = {
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{kSubsampleTest1, arraysize(kSubsampleTest1)},
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{kSubsampleTest2, arraysize(kSubsampleTest2)},
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{kSubsampleTest3, arraysize(kSubsampleTest3)},
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{kSubsampleTest4, arraysize(kSubsampleTest4)},
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{kSubsampleTest5, arraysize(kSubsampleTest5)},
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{kSubsampleTest6, arraysize(kSubsampleTest6)},
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{kSubsampleTest7, arraysize(kSubsampleTest7)},
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{kSubsampleTest8, arraysize(kSubsampleTest8)},
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{kSubsampleTest9, arraysize(kSubsampleTest9)},
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{kSubsampleTest10, arraysize(kSubsampleTest10)}, };
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// IV test values.
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const uint32 kTextSizeInBytes = 60; // 3 full blocks + 1 partial block.
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const uint8 kIv128Zero[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
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const uint8 kIv128Two[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2};
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const uint8 kIv128Four[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4};
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const uint8 kIv128Max64[] = {0, 0, 0, 0, 0, 0, 0, 0,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
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const uint8 kIv128OneAndThree[] = {0, 0, 0, 0, 0, 0, 0, 1,
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0, 0, 0, 0, 0, 0, 0, 3};
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const uint8 kIv128MaxMinusOne[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xfe};
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const uint8 kIv64Zero[] = {0, 0, 0, 0, 0, 0, 0, 0};
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const uint8 kIv64One[] = {0, 0, 0, 0, 0, 0, 0, 1};
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const uint8 kIv64MaxMinusOne[] = {0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xfe};
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const uint8 kIv64Max[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
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struct IvTestCase {
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const uint8* iv_test;
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uint32 iv_size;
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const uint8* iv_expected;
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};
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// As recommended in ISO/IEC FDIS 23001-7: CENC spec,
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// For 64-bit (8-byte) IV_Sizes, initialization vectors for subsequent samples
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// can be created by incrementing the initialization vector of the previous
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// sample. For 128-bit (16-byte) IV_Sizes, initialization vectors for subsequent
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// samples should be created by adding the block count of the previous sample to
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// the initialization vector of the previous sample.
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const IvTestCase kIvTestCases[] = {
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{kIv128Zero, arraysize(kIv128Zero), kIv128Four},
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{kIv128Max64, arraysize(kIv128Max64), kIv128OneAndThree},
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{kIv128MaxMinusOne, arraysize(kIv128MaxMinusOne), kIv128Two},
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{kIv64Zero, arraysize(kIv64Zero), kIv64One},
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{kIv64MaxMinusOne, arraysize(kIv64MaxMinusOne), kIv64Max},
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{kIv64Max, arraysize(kIv64Max), kIv64Zero}, };
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// We support AES 128, i.e. 16 bytes key only.
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const uint8 kInvalidKey[] = {0x2b, 0x7e, 0x15, 0x16, 0x28, 0xae, 0xd2,
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0xa6, 0xab, 0xf7, 0x15, 0x88, 0x09, };
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// We support Iv of size 8 or 16 only as defined in CENC spec.
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const uint8 kInvalidIv[] = {0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
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0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, };
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} // namespace
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namespace media {
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class AesEncryptorTest : public testing::Test {
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public:
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virtual void SetUp() {
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key_.assign(kAesCtrKey, kAesCtrKey + arraysize(kAesCtrKey));
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iv_.assign(kAesCtrIv, kAesCtrIv + arraysize(kAesCtrIv));
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plaintext_.assign(kAesCtrPlaintext,
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kAesCtrPlaintext + arraysize(kAesCtrPlaintext));
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ciphertext_.assign(kAesCtrCiphertext,
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kAesCtrCiphertext + arraysize(kAesCtrCiphertext));
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ASSERT_TRUE(encryptor_.InitializeWithIv(key_, iv_));
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}
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protected:
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std::vector<uint8> key_;
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std::vector<uint8> iv_;
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std::vector<uint8> plaintext_;
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std::vector<uint8> ciphertext_;
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AesCtrEncryptor encryptor_;
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};
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TEST_F(AesEncryptorTest, NistTestCase) {
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std::vector<uint8> encrypted;
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EXPECT_TRUE(encryptor_.Encrypt(plaintext_, &encrypted));
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EXPECT_EQ(ciphertext_, encrypted);
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encryptor_.SetIv(iv_);
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std::vector<uint8> decrypted;
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EXPECT_TRUE(encryptor_.Decrypt(encrypted, &decrypted));
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EXPECT_EQ(plaintext_, decrypted);
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}
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TEST_F(AesEncryptorTest, NistTestCaseInplaceEncryptionDecryption) {
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std::vector<uint8> buffer = plaintext_;
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EXPECT_TRUE(encryptor_.Encrypt(&buffer[0], buffer.size(), &buffer[0]));
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EXPECT_EQ(ciphertext_, buffer);
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encryptor_.SetIv(iv_);
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EXPECT_TRUE(encryptor_.Decrypt(&buffer[0], buffer.size(), &buffer[0]));
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EXPECT_EQ(plaintext_, buffer);
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}
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TEST_F(AesEncryptorTest, EncryptDecryptString) {
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static const char kPlaintext[] = "normal plaintext of random length";
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static const char kExpectedCiphertextInHex[] =
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"82E3AD1EF90C5CC09EB37F1B9EFBD99016441A1C15123F0777CD57BB993E14DA02";
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std::string ciphertext;
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EXPECT_TRUE(encryptor_.Encrypt(kPlaintext, &ciphertext));
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EXPECT_EQ(kExpectedCiphertextInHex,
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base::HexEncode(ciphertext.data(), ciphertext.size()));
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std::string decrypted;
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encryptor_.SetIv(iv_);
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EXPECT_TRUE(encryptor_.Decrypt(ciphertext, &decrypted));
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EXPECT_EQ(kPlaintext, decrypted);
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}
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TEST_F(AesEncryptorTest, 128BitIVBoundaryCaseEncryption) {
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// There are four blocks of text in |plaintext_|. The first block should be
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// encrypted with IV = kIv128Max64, the subsequent blocks should be encrypted
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// with iv 0 to 3.
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std::vector<uint8> iv_max64(kIv128Max64,
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kIv128Max64 + arraysize(kIv128Max64));
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ASSERT_TRUE(encryptor_.InitializeWithIv(key_, iv_max64));
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std::vector<uint8> encrypted;
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EXPECT_TRUE(encryptor_.Encrypt(plaintext_, &encrypted));
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std::vector<uint8> iv_one_and_three(
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kIv128OneAndThree, kIv128OneAndThree + arraysize(kIv128OneAndThree));
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encryptor_.UpdateIv();
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EXPECT_EQ(iv_one_and_three, encryptor_.iv());
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ASSERT_TRUE(encryptor_.InitializeWithIv(key_, iv_max64));
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std::vector<uint8> encrypted_verify(plaintext_.size(), 0);
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EXPECT_TRUE(
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encryptor_.Encrypt(&plaintext_[0], kAesBlockSize, &encrypted_verify[0]));
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std::vector<uint8> iv_zero(kIv128Zero, kIv128Zero + arraysize(kIv128Zero));
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ASSERT_TRUE(encryptor_.InitializeWithIv(key_, iv_zero));
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EXPECT_TRUE(encryptor_.Encrypt(&plaintext_[kAesBlockSize],
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kAesBlockSize * 3,
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&encrypted_verify[kAesBlockSize]));
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EXPECT_EQ(encrypted, encrypted_verify);
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}
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TEST_F(AesEncryptorTest, InitWithRandomIv) {
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const uint8 kIvSize = 8;
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ASSERT_TRUE(encryptor_.InitializeWithRandomIv(key_, kIvSize));
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ASSERT_EQ(kIvSize, encryptor_.iv().size());
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LOG(INFO) << "Random IV: " << base::HexEncode(&encryptor_.iv()[0],
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encryptor_.iv().size());
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}
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TEST_F(AesEncryptorTest, UnsupportedKeySize) {
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std::vector<uint8> key(kInvalidKey, kInvalidKey + arraysize(kInvalidKey));
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ASSERT_DEATH(encryptor_.InitializeWithIv(key, iv_), "");
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}
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TEST_F(AesEncryptorTest, UnsupportedIV) {
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std::vector<uint8> iv(kInvalidIv, kInvalidIv + arraysize(kInvalidIv));
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ASSERT_DEATH(encryptor_.InitializeWithIv(key_, iv), "");
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}
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TEST_F(AesEncryptorTest, IncorrectIvSize) {
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ASSERT_DEATH(encryptor_.InitializeWithRandomIv(key_, 15), "");
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}
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class AesCtrEncryptorSubsampleTest
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: public AesEncryptorTest,
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public ::testing::WithParamInterface<SubsampleTestCase> {};
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TEST_P(AesCtrEncryptorSubsampleTest, NistTestCaseSubsamples) {
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const SubsampleTestCase* test_case = &GetParam();
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std::vector<uint8> encrypted(plaintext_.size(), 0);
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for (uint32 i = 0, offset = 0; i < test_case->subsample_count; ++i) {
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uint32 len = test_case->subsample_sizes[i];
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EXPECT_TRUE(
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encryptor_.Encrypt(&plaintext_[offset], len, &encrypted[offset]));
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offset += len;
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EXPECT_EQ(offset % kAesBlockSize, encryptor_.block_offset());
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}
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EXPECT_EQ(ciphertext_, encrypted);
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encryptor_.SetIv(iv_);
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std::vector<uint8> decrypted(encrypted.size(), 0);
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for (uint32 i = 0, offset = 0; i < test_case->subsample_count; ++i) {
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uint32 len = test_case->subsample_sizes[i];
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EXPECT_TRUE(
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encryptor_.Decrypt(&encrypted[offset], len, &decrypted[offset]));
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offset += len;
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EXPECT_EQ(offset % kAesBlockSize, encryptor_.block_offset());
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}
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EXPECT_EQ(plaintext_, decrypted);
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}
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INSTANTIATE_TEST_CASE_P(SubsampleTestCases,
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AesCtrEncryptorSubsampleTest,
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::testing::ValuesIn(kSubsampleTestCases));
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class AesCtrEncryptorIvTest : public ::testing::TestWithParam<IvTestCase> {};
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TEST_P(AesCtrEncryptorIvTest, IvTest) {
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// Some dummy key and plaintext.
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std::vector<uint8> key(16, 1);
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std::vector<uint8> plaintext(kTextSizeInBytes, 3);
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std::vector<uint8> iv_test(GetParam().iv_test,
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GetParam().iv_test + GetParam().iv_size);
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std::vector<uint8> iv_expected(GetParam().iv_expected,
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GetParam().iv_expected + GetParam().iv_size);
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AesCtrEncryptor encryptor;
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ASSERT_TRUE(encryptor.InitializeWithIv(key, iv_test));
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std::vector<uint8> encrypted;
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EXPECT_TRUE(encryptor.Encrypt(plaintext, &encrypted));
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encryptor.UpdateIv();
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EXPECT_EQ(iv_expected, encryptor.iv());
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}
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INSTANTIATE_TEST_CASE_P(IvTestCases,
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AesCtrEncryptorIvTest,
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::testing::ValuesIn(kIvTestCases));
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} // namespace media
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