| // Copyright 2015 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 "components/gcm_driver/crypto/gcm_message_cryptographer.h" |
| |
| #include <memory> |
| |
| #include "base/base64url.h" |
| #include "base/memory/ptr_util.h" |
| #include "base/strings/string_util.h" |
| #include "components/gcm_driver/crypto/p256_key_util.h" |
| #include "crypto/random.h" |
| #include "testing/gtest/include/gtest/gtest.h" |
| |
| namespace gcm { |
| |
| namespace { |
| |
| // Example plaintext data to use in the tests. |
| const char kExamplePlaintext[] = "Example plaintext"; |
| |
| // Expected sizes of the different input given to the cryptographer. |
| constexpr size_t kEcdhSharedSecretSize = 32; |
| constexpr size_t kAuthSecretSize = 16; |
| constexpr size_t kSaltSize = 16; |
| |
| // Keying material for both parties as P-256 EC points. Used to make sure that |
| // the test vectors are reproducible. |
| const unsigned char kCommonSenderPublicKey[] = { |
| 0x04, 0x05, 0x3C, 0xA1, 0xB9, 0xA5, 0xAB, 0xB8, 0x2D, 0x88, 0x48, |
| 0x82, 0xC9, 0x49, 0x19, 0x91, 0xD5, 0xFD, 0xD1, 0x92, 0xDB, 0xA7, |
| 0x7E, 0x70, 0x48, 0x37, 0x41, 0xCD, 0x90, 0x05, 0x80, 0xDF, 0x65, |
| 0x9A, 0xA1, 0x1A, 0x04, 0xF1, 0x98, 0x25, 0xF2, 0xC2, 0x13, 0x5D, |
| 0xD9, 0x72, 0x35, 0x75, 0x24, 0xF9, 0xFF, 0x25, 0xD1, 0xBC, 0x84, |
| 0x46, 0x4E, 0x88, 0x08, 0x55, 0x70, 0x9F, 0xA7, 0x07, 0xD9}; |
| static_assert(arraysize(kCommonSenderPublicKey) == 65, |
| "Raw P-256 public keys must be 65 bytes in size."); |
| |
| const unsigned char kCommonRecipientPublicKey[] = { |
| 0x04, 0x35, 0x02, 0x67, 0xB9, 0x10, 0x8F, 0x9B, 0xF1, 0x85, 0xF5, |
| 0x1B, 0xD7, 0xA4, 0xEF, 0xBD, 0x28, 0xB3, 0x11, 0x40, 0xBA, 0xD0, |
| 0xEE, 0xB2, 0x97, 0xDA, 0x6A, 0x93, 0x2D, 0x26, 0x45, 0xBD, 0xB2, |
| 0x9A, 0x9F, 0xB8, 0x19, 0xD8, 0x21, 0x6F, 0x66, 0xE3, 0xF6, 0x0B, |
| 0x74, 0xB2, 0x28, 0x38, 0xDC, 0xA7, 0x8A, 0x58, 0x0D, 0x56, 0x47, |
| 0x3E, 0xD0, 0x5B, 0x5C, 0x93, 0x4E, 0xB3, 0x89, 0x87, 0x64}; |
| static_assert(arraysize(kCommonRecipientPublicKey) == 65, |
| "Raw P-256 public keys must be 65 bytes in size."); |
| |
| const unsigned char kCommonRecipientPublicKeyX509[] = { |
| 0x30, 0x59, 0x30, 0x13, 0x06, 0x07, 0x2A, 0x86, 0x48, 0xCE, 0x3D, 0x02, |
| 0x01, 0x06, 0x08, 0x2A, 0x86, 0x48, 0xCE, 0x3D, 0x03, 0x01, 0x07, 0x03, |
| 0x42, 0x00, 0x04, 0x35, 0x02, 0x67, 0xB9, 0x10, 0x8F, 0x9B, 0xF1, 0x85, |
| 0xF5, 0x1B, 0xD7, 0xA4, 0xEF, 0xBD, 0x28, 0xB3, 0x11, 0x40, 0xBA, 0xD0, |
| 0xEE, 0xB2, 0x97, 0xDA, 0x6A, 0x93, 0x2D, 0x26, 0x45, 0xBD, 0xB2, 0x9A, |
| 0x9F, 0xB8, 0x19, 0xD8, 0x21, 0x6F, 0x66, 0xE3, 0xF6, 0x0B, 0x74, 0xB2, |
| 0x28, 0x38, 0xDC, 0xA7, 0x8A, 0x58, 0x0D, 0x56, 0x47, 0x3E, 0xD0, 0x5B, |
| 0x5C, 0x93, 0x4E, 0xB3, 0x89, 0x87, 0x64}; |
| |
| const unsigned char kCommonRecipientPrivateKey[] = { |
| 0x30, 0x81, 0xB0, 0x30, 0x1B, 0x06, 0x0A, 0x2A, 0x86, 0x48, 0x86, 0xF7, |
| 0x0D, 0x01, 0x0C, 0x01, 0x03, 0x30, 0x0D, 0x04, 0x08, 0xF3, 0xD6, 0x39, |
| 0xB0, 0xBF, 0xC2, 0xF7, 0xEF, 0x02, 0x01, 0x01, 0x04, 0x81, 0x90, 0x0C, |
| 0xBC, 0xC9, 0x5F, 0x95, 0x6C, 0x4C, 0x6A, 0x57, 0xC4, 0x04, 0x47, 0x8F, |
| 0x59, 0xFD, 0x35, 0x97, 0x3B, 0xF3, 0x66, 0xA7, 0xEB, 0x8D, 0x44, 0x1E, |
| 0xCB, 0x4D, 0xFC, 0xD8, 0x8A, 0x38, 0xCA, 0xA8, 0xD7, 0x93, 0x45, 0x61, |
| 0xCC, 0xC7, 0xD8, 0x24, 0x16, 0xBF, 0xFC, 0xF4, 0x20, 0x54, 0x53, 0xB1, |
| 0x20, 0x3E, 0x19, 0x62, 0x08, 0xBE, 0x3D, 0x5B, 0x56, 0x60, 0x2D, 0x0C, |
| 0xDB, 0x29, 0x4A, 0x0B, 0xC8, 0xE0, 0x58, 0xAA, 0xE0, 0xAE, 0xE5, 0x91, |
| 0xEA, 0x6E, 0x40, 0x39, 0xD7, 0x3A, 0x1D, 0x75, 0x1E, 0xFF, 0xE3, 0xA7, |
| 0x64, 0x53, 0x50, 0x4A, 0xC1, 0xE9, 0x31, 0x9F, 0x0E, 0xB5, 0x12, 0x3E, |
| 0x57, 0xD7, 0x96, 0x5D, 0x69, 0xD5, 0x5A, 0xF8, 0x7C, 0x21, 0xF2, 0x43, |
| 0x2C, 0x34, 0x11, 0x8C, 0xB4, 0x37, 0x85, 0xB8, 0xDF, 0xFB, 0x5E, 0x68, |
| 0xD5, 0xAA, 0xBC, 0x29, 0x2B, 0xE1, 0x8C, 0xA2, 0x76, 0xAA, 0x59, 0x2D, |
| 0x8D, 0xB9, 0xC0, 0x11, 0xC8, 0xA9, 0x01, 0xD6, 0xB3, 0xBD, 0xEE}; |
| |
| const unsigned char kCommonAuthSecret[] = {0x25, 0xF2, 0xC2, 0xB8, 0x19, 0xD8, |
| 0xFD, 0x35, 0x97, 0xDF, 0xFB, 0x5E, |
| 0xF6, 0x0B, 0xD7, 0xA4}; |
| static_assert(arraysize(kCommonAuthSecret) == 16, |
| "Auth secrets must be 16 bytes in size."); |
| |
| // Test vectors containing reference input for draft-ietf-webpush-encryption-03 |
| // that was created using an separate JavaScript implementation of the draft. |
| struct TestVector { |
| const char* const input; |
| const unsigned char ecdh_shared_secret[kEcdhSharedSecretSize]; |
| const unsigned char auth_secret[kAuthSecretSize]; |
| const unsigned char salt[kSaltSize]; |
| size_t record_size; |
| const char* const output; |
| }; |
| |
| const TestVector kEncryptionTestVectorsDraft03[] = { |
| // Simple message. |
| {"Hello, world!", |
| {0x0B, 0x32, 0xE2, 0xD1, 0x6A, 0xBF, 0x4F, 0x2C, 0x49, 0xEA, 0xF7, |
| 0x5D, 0x71, 0x7D, 0x89, 0xA9, 0xA7, 0x5E, 0x21, 0xB2, 0xB5, 0x51, |
| 0xE6, 0x4C, 0x08, 0x68, 0xD3, 0x6F, 0x8F, 0x72, 0x7E, 0x14}, |
| {0xD3, 0xF2, 0x78, 0xBD, 0x8D, 0xDD, 0x84, 0x99, 0x66, 0x08, 0xD7, 0x0F, |
| 0xBA, 0x9B, 0x60, 0xFC}, |
| {0x15, 0x4A, 0xD7, 0x73, 0x92, 0xBD, 0x3B, 0xCF, 0x6F, 0x98, 0xDC, 0x9B, |
| 0x8B, 0x56, 0xFB, 0xBD}, |
| 4096, |
| "T4SXCyj84drA6wRaBNLGDMzeyOEBWjsIEkS2ros6Aw"}, |
| // Empty message. |
| {"", |
| {0x3F, 0xD8, 0x95, 0x2C, 0xA2, 0x11, 0xBD, 0x7B, 0x57, 0xB2, 0x00, |
| 0xBD, 0x57, 0x68, 0x3F, 0xF0, 0x14, 0x57, 0x5F, 0xB1, 0x9F, 0x15, |
| 0x4F, 0x11, 0xF0, 0x4D, 0xA2, 0xE8, 0x4C, 0xEA, 0x74, 0x3B}, |
| {0xB1, 0xE1, 0xC7, 0x32, 0x4C, 0xAA, 0x56, 0x32, 0x68, 0x20, 0x0F, 0x26, |
| 0x3F, 0x48, 0x4D, 0x99}, |
| {0xE9, 0x39, 0x45, 0xBC, 0x96, 0x96, 0x88, 0x76, 0xFC, 0xA1, 0xAD, 0xE4, |
| 0x9D, 0x28, 0xF3, 0x73}, |
| 4096, |
| "8s-Tzq8Cn_eobL6uEcNDXL7K"}}; |
| |
| const TestVector kDecryptionTestVectorsDraft03[] = { |
| // Simple message. |
| {"lsemWwzlFoJzoidHCnVuxRiJpotTcYokJHKzmQ2FsA", |
| {0x4D, 0x3A, 0x6C, 0xBA, 0xD8, 0x1D, 0x8E, 0x68, 0x8B, 0xE6, 0x76, |
| 0xA7, 0xFF, 0x60, 0xC7, 0xFE, 0x77, 0xE2, 0x6D, 0x37, 0xF6, 0x12, |
| 0x44, 0xE2, 0x25, 0xFE, 0xE1, 0xD8, 0xCF, 0x8A, 0xA8, 0x33}, |
| {0x62, 0x36, 0xAC, 0xCA, 0x74, 0xD4, 0x49, 0x49, 0x6B, 0x27, 0xB4, 0xF7, |
| 0xC1, 0xE5, 0x30, 0x9A}, |
| {0x1C, 0xA7, 0xFD, 0x98, 0x1A, 0xE4, 0xA7, 0x92, 0xE1, 0xB6, 0xA1, 0xE3, |
| 0x41, 0x63, 0x87, 0x76}, |
| 4096, |
| "Hello, world!"}, |
| // Simple message with 16 bytes of padding. |
| {"VQB6Ds-q9xRqyM1tj_gksSgc78vCWEhphZ-NF1E7_yMfPuRRZlC_Xt9_2NsX3SU", |
| {0x8B, 0x38, 0x8E, 0x22, 0xD5, 0xC4, 0xFD, 0x65, 0x8A, 0xBB, 0xD9, |
| 0x58, 0xBD, 0xF5, 0xFF, 0x79, 0xCF, 0x9D, 0xBD, 0x87, 0x16, 0x7E, |
| 0x93, 0x84, 0x20, 0x8E, 0x8D, 0x49, 0x41, 0x7D, 0x8E, 0x8F}, |
| {0x3E, 0x65, 0xC7, 0x1F, 0x75, 0x7A, 0x43, 0xC4, 0x78, 0x6C, 0x64, 0x99, |
| 0x49, 0xA0, 0xC4, 0xB2}, |
| {0x43, 0x4D, 0x30, 0x8E, 0xE4, 0x76, 0xB5, 0xD0, 0x87, 0xFC, 0x04, 0xD1, |
| 0x2E, 0x35, 0x75, 0x63}, |
| 4096, |
| "Hello, world!"}, |
| // Empty message. |
| {"xU8a499UHB_-YSV4VOm-JZnT", |
| {0x68, 0x72, 0x3D, 0x13, 0xE7, 0x50, 0xFA, 0x3E, 0xA0, 0x59, 0x33, |
| 0xF1, 0x73, 0xA8, 0xE8, 0xCD, 0x8D, 0xD4, 0x3C, 0xDC, 0xDE, 0x06, |
| 0x35, 0x5F, 0x51, 0xBB, 0xB2, 0x57, 0x97, 0x72, 0x9D, 0xFB}, |
| {0x84, 0xB2, 0x2A, 0xE7, 0xC6, 0xC0, 0xCE, 0x5F, 0xAD, 0x37, 0x06, 0x7F, |
| 0xD1, 0xFD, 0x10, 0x87}, |
| {0x9B, 0xC5, 0x8D, 0x5F, 0xD6, 0xD2, 0xA6, 0xBD, 0xAF, 0x4B, 0xD9, 0x60, |
| 0xC6, 0xB4, 0x50, 0x0F}, |
| 4096, |
| ""}, |
| // Message with an invalid record size. |
| {"gfB-_edj7qEVokyVHpkDJN6FVKHnlWs1RCDw5bmrwQ", |
| {0x5F, 0xE1, 0x7C, 0x4B, 0xFF, 0x04, 0xBF, 0x2C, 0x70, 0x67, 0xFA, |
| 0xF8, 0xB0, 0x07, 0x4F, 0xF6, 0x3C, 0x03, 0x6F, 0xBE, 0xA1, 0x1F, |
| 0x4B, 0x99, 0x25, 0x4F, 0xB9, 0x5F, 0xC4, 0x78, 0x76, 0xDE}, |
| {0x59, 0xAB, 0x45, 0xFC, 0x6A, 0xF5, 0xB3, 0xE0, 0xF5, 0x40, 0xD7, 0x98, |
| 0x0F, 0xF0, 0xA4, 0xCB}, |
| {0xDB, 0xA0, 0xF2, 0x91, 0x8D, 0x50, 0x42, 0xE0, 0x17, 0x68, 0x5B, 0x9B, |
| 0xF2, 0xA2, 0xC3, 0xF9}, |
| 7, |
| nullptr}, |
| // Message with four bytes of invalid, non-zero padding. |
| {"2FJmrF95yVU8Q8cYQy9OoOwCb59ZoRlxazPE0T-MNOSMbr0", |
| {0x6B, 0x82, 0x92, 0xD3, 0x71, 0x9A, 0x97, 0x76, 0x45, 0x11, 0x99, |
| 0x6D, 0xBF, 0x56, 0xCC, 0x81, 0x98, 0x56, 0x80, 0xF5, 0x78, 0x36, |
| 0xD6, 0x43, 0x95, 0x68, 0xDB, 0x0F, 0x23, 0x39, 0xF3, 0x6E}, |
| {0x02, 0x16, 0xDC, 0xC3, 0xDE, 0x2C, 0xB5, 0x08, 0x89, 0xDB, 0xD8, 0x18, |
| 0x68, 0x83, 0x1C, 0xDB}, |
| {0xB7, 0x85, 0x5D, 0x8E, 0x84, 0xC3, 0x2D, 0x61, 0x9B, 0x78, 0x3B, 0x60, |
| 0x0E, 0x70, 0x84, 0xF3}, |
| 4096, |
| nullptr}, |
| // Message with multiple (2) records. |
| {"reI6sW6y67FI8Kxk-x9GNwiu77His_f5GioDBiKS7IzjDQ", |
| {0xC6, 0x16, 0x6F, 0xAF, 0xE1, 0xB6, 0x8F, 0x2B, 0x0F, 0x67, 0x5A, |
| 0xC7, 0xAC, 0x7E, 0xF6, 0x7C, 0x33, 0xA2, 0xA1, 0x11, 0xB0, 0xB0, |
| 0xAB, 0xAC, 0x37, 0x61, 0xF4, 0xCB, 0x98, 0xFF, 0x00, 0x51}, |
| {0xAE, 0xDA, 0x86, 0xDF, 0x6B, 0x03, 0x88, 0xDE, 0x90, 0xBB, 0xB7, 0xA0, |
| 0x78, 0x91, 0x3A, 0x36}, |
| {0x4C, 0x4E, 0x2A, 0x8D, 0x88, 0x82, 0xCF, 0xC2, 0xF9, 0x8A, 0xFD, 0x31, |
| 0xF8, 0xD1, 0xF6, 0xB5}, |
| 8, |
| nullptr}}; |
| |
| } // namespace |
| |
| class GCMMessageCryptographerTest : public ::testing::Test { |
| public: |
| void SetUp() override { |
| cryptographer_ = base::MakeUnique<GCMMessageCryptographer>( |
| GCMMessageCryptographer::Version::DRAFT_03); |
| |
| recipient_public_key_.assign( |
| kCommonRecipientPublicKey, |
| kCommonRecipientPublicKey + arraysize(kCommonRecipientPublicKey)); |
| sender_public_key_.assign( |
| kCommonSenderPublicKey, |
| kCommonSenderPublicKey + arraysize(kCommonSenderPublicKey)); |
| |
| std::string recipient_private_key( |
| kCommonRecipientPrivateKey, |
| kCommonRecipientPrivateKey + arraysize(kCommonRecipientPrivateKey)); |
| |
| // TODO(peter): Remove the dependency on the x509 keying material when |
| // crbug.com/618025 has been resolved. |
| std::string recipient_public_key_x509( |
| kCommonRecipientPublicKeyX509, |
| kCommonRecipientPublicKeyX509 + |
| arraysize(kCommonRecipientPublicKeyX509)); |
| |
| ASSERT_TRUE(ComputeSharedP256Secret( |
| recipient_private_key, recipient_public_key_x509, sender_public_key_, |
| &ecdh_shared_secret_)); |
| |
| auth_secret_.assign(kCommonAuthSecret, |
| kCommonAuthSecret + arraysize(kCommonAuthSecret)); |
| } |
| |
| protected: |
| // Generates a cryptographically secure random salt of 16-octets in size, the |
| // required length as expected by the HKDF. |
| std::string GenerateRandomSalt() { |
| std::string salt; |
| |
| crypto::RandBytes(base::WriteInto(&salt, kSaltSize + 1), kSaltSize); |
| return salt; |
| } |
| |
| // Public keys of the recipient and sender as uncompressed P-256 EC points. |
| std::string recipient_public_key_; |
| std::string sender_public_key_; |
| |
| // Shared secret to use in transformations. Associated with the keys above. |
| std::string ecdh_shared_secret_; |
| |
| // Authentication secret to use in tests where no specific value is expected. |
| std::string auth_secret_; |
| |
| // The GCMMessageCryptographer instance to use for the tests. |
| std::unique_ptr<GCMMessageCryptographer> cryptographer_; |
| }; |
| |
| TEST_F(GCMMessageCryptographerTest, RoundTrip) { |
| const std::string salt = GenerateRandomSalt(); |
| |
| size_t record_size = 0; |
| |
| std::string ciphertext, plaintext; |
| ASSERT_TRUE(cryptographer_->Encrypt( |
| recipient_public_key_, sender_public_key_, ecdh_shared_secret_, |
| auth_secret_, salt, kExamplePlaintext, &record_size, &ciphertext)); |
| |
| EXPECT_GT(record_size, ciphertext.size() - 16); |
| EXPECT_GT(ciphertext.size(), 0u); |
| |
| ASSERT_TRUE(cryptographer_->Decrypt(recipient_public_key_, sender_public_key_, |
| ecdh_shared_secret_, auth_secret_, salt, |
| ciphertext, record_size, &plaintext)); |
| |
| EXPECT_EQ(kExamplePlaintext, plaintext); |
| } |
| |
| TEST_F(GCMMessageCryptographerTest, RoundTripEmptyMessage) { |
| const std::string salt = GenerateRandomSalt(); |
| const std::string message = ""; |
| |
| size_t record_size = 0; |
| |
| std::string ciphertext, plaintext; |
| ASSERT_TRUE(cryptographer_->Encrypt(recipient_public_key_, sender_public_key_, |
| ecdh_shared_secret_, auth_secret_, salt, |
| message, &record_size, &ciphertext)); |
| |
| EXPECT_GT(record_size, ciphertext.size() - 16); |
| EXPECT_GT(ciphertext.size(), 0u); |
| |
| ASSERT_TRUE(cryptographer_->Decrypt(recipient_public_key_, sender_public_key_, |
| ecdh_shared_secret_, auth_secret_, salt, |
| ciphertext, record_size, &plaintext)); |
| |
| EXPECT_EQ(message, plaintext); |
| } |
| |
| TEST_F(GCMMessageCryptographerTest, InvalidRecordSize) { |
| const std::string salt = GenerateRandomSalt(); |
| |
| size_t record_size = 0; |
| |
| std::string ciphertext, plaintext; |
| ASSERT_TRUE(cryptographer_->Encrypt( |
| recipient_public_key_, sender_public_key_, ecdh_shared_secret_, |
| auth_secret_, salt, kExamplePlaintext, &record_size, &ciphertext)); |
| |
| EXPECT_GT(record_size, ciphertext.size() - 16); |
| |
| EXPECT_FALSE(cryptographer_->Decrypt( |
| recipient_public_key_, sender_public_key_, ecdh_shared_secret_, |
| auth_secret_, salt, ciphertext, 0 /* record_size */, &plaintext)); |
| |
| EXPECT_FALSE(cryptographer_->Decrypt( |
| recipient_public_key_, sender_public_key_, ecdh_shared_secret_, |
| auth_secret_, salt, ciphertext, ciphertext.size() - 17, &plaintext)); |
| |
| EXPECT_TRUE(cryptographer_->Decrypt( |
| recipient_public_key_, sender_public_key_, ecdh_shared_secret_, |
| auth_secret_, salt, ciphertext, ciphertext.size() - 16, &plaintext)); |
| } |
| |
| TEST_F(GCMMessageCryptographerTest, InvalidRecordPadding) { |
| std::string message = std::string(sizeof(uint16_t), '\0') + kExamplePlaintext; |
| |
| const std::string salt = GenerateRandomSalt(); |
| |
| const std::string prk = |
| cryptographer_->encryption_scheme_->DerivePseudoRandomKey( |
| ecdh_shared_secret_, auth_secret_); |
| const std::string content_encryption_key = |
| cryptographer_->DeriveContentEncryptionKey(recipient_public_key_, |
| sender_public_key_, prk, salt); |
| const std::string nonce = cryptographer_->DeriveNonce( |
| recipient_public_key_, sender_public_key_, prk, salt); |
| |
| ASSERT_GT(message.size(), 1u); |
| const size_t record_size = message.size() + 1; |
| |
| std::string ciphertext, plaintext; |
| ASSERT_TRUE(cryptographer_->TransformRecord( |
| GCMMessageCryptographer::Direction::ENCRYPT, message, |
| content_encryption_key, nonce, &ciphertext)); |
| |
| ASSERT_TRUE(cryptographer_->Decrypt(recipient_public_key_, sender_public_key_, |
| ecdh_shared_secret_, auth_secret_, salt, |
| ciphertext, record_size, &plaintext)); |
| |
| // Note that GCMMessageCryptographer::Decrypt removes the padding. |
| EXPECT_EQ(kExamplePlaintext, plaintext); |
| |
| // Now run the same steps again, but say that there are four padding octets. |
| // This should be rejected because the padding will not be all zeros. |
| message[0] = 4; |
| |
| ASSERT_TRUE(cryptographer_->TransformRecord( |
| GCMMessageCryptographer::Direction::ENCRYPT, message, |
| content_encryption_key, nonce, &ciphertext)); |
| |
| ASSERT_FALSE(cryptographer_->Decrypt( |
| recipient_public_key_, sender_public_key_, ecdh_shared_secret_, |
| auth_secret_, salt, ciphertext, record_size, &plaintext)); |
| |
| // Do the same but changing the second octet indicating padding size, leaving |
| // the first octet at zero. |
| message[0] = 0; |
| message[1] = 4; |
| |
| ASSERT_TRUE(cryptographer_->TransformRecord( |
| GCMMessageCryptographer::Direction::ENCRYPT, message, |
| content_encryption_key, nonce, &ciphertext)); |
| |
| ASSERT_FALSE(cryptographer_->Decrypt( |
| recipient_public_key_, sender_public_key_, ecdh_shared_secret_, |
| auth_secret_, salt, ciphertext, record_size, &plaintext)); |
| |
| // Run the same steps again, but say that there are more padding octets than |
| // the length of the message. |
| message[0] = 64; |
| |
| EXPECT_GT(static_cast<size_t>(message[0]), message.size()); |
| ASSERT_TRUE(cryptographer_->TransformRecord( |
| GCMMessageCryptographer::Direction::ENCRYPT, message, |
| content_encryption_key, nonce, &ciphertext)); |
| |
| ASSERT_FALSE(cryptographer_->Decrypt( |
| recipient_public_key_, sender_public_key_, ecdh_shared_secret_, |
| auth_secret_, salt, ciphertext, record_size, &plaintext)); |
| } |
| |
| TEST_F(GCMMessageCryptographerTest, AuthSecretAffectsPRK) { |
| std::string first_auth_secret, second_auth_secret; |
| |
| crypto::RandBytes(base::WriteInto(&first_auth_secret, kAuthSecretSize + 1), |
| kAuthSecretSize); |
| crypto::RandBytes(base::WriteInto(&second_auth_secret, kAuthSecretSize + 1), |
| kAuthSecretSize); |
| |
| ASSERT_NE(cryptographer_->encryption_scheme_->DerivePseudoRandomKey( |
| ecdh_shared_secret_, first_auth_secret), |
| cryptographer_->encryption_scheme_->DerivePseudoRandomKey( |
| ecdh_shared_secret_, second_auth_secret)); |
| |
| std::string salt = GenerateRandomSalt(); |
| |
| // Verify that the IKM actually gets used by the transformations. |
| size_t first_record_size, second_record_size; |
| std::string first_ciphertext, second_ciphertext; |
| |
| ASSERT_TRUE(cryptographer_->Encrypt(recipient_public_key_, sender_public_key_, |
| ecdh_shared_secret_, first_auth_secret, |
| salt, kExamplePlaintext, |
| &first_record_size, &first_ciphertext)); |
| |
| ASSERT_TRUE(cryptographer_->Encrypt(recipient_public_key_, sender_public_key_, |
| ecdh_shared_secret_, second_auth_secret, |
| salt, kExamplePlaintext, |
| &second_record_size, &second_ciphertext)); |
| |
| // If the ciphertexts differ despite the same key and salt, it got used. |
| ASSERT_NE(first_ciphertext, second_ciphertext); |
| EXPECT_EQ(first_record_size, second_record_size); |
| |
| // Verify that the different ciphertexts can also be translated back to the |
| // plaintext content. This will fail if the auth secret isn't considered. |
| std::string first_plaintext, second_plaintext; |
| |
| ASSERT_TRUE(cryptographer_->Decrypt(recipient_public_key_, sender_public_key_, |
| ecdh_shared_secret_, first_auth_secret, |
| salt, first_ciphertext, first_record_size, |
| &first_plaintext)); |
| |
| ASSERT_TRUE(cryptographer_->Decrypt(recipient_public_key_, sender_public_key_, |
| ecdh_shared_secret_, second_auth_secret, |
| salt, second_ciphertext, |
| second_record_size, &second_plaintext)); |
| |
| EXPECT_EQ(kExamplePlaintext, first_plaintext); |
| EXPECT_EQ(kExamplePlaintext, second_plaintext); |
| } |
| |
| class GCMMessageCryptographerTestVectorTest |
| : public GCMMessageCryptographerTest {}; |
| |
| TEST_F(GCMMessageCryptographerTestVectorTest, EncryptionVectorsDraft03) { |
| std::string ecdh_shared_secret, auth_secret, salt, ciphertext, output; |
| size_t record_size = 0; |
| |
| for (size_t i = 0; i < arraysize(kEncryptionTestVectorsDraft03); ++i) { |
| SCOPED_TRACE(i); |
| |
| ecdh_shared_secret.assign( |
| kEncryptionTestVectorsDraft03[i].ecdh_shared_secret, |
| kEncryptionTestVectorsDraft03[i].ecdh_shared_secret + |
| kEcdhSharedSecretSize); |
| |
| auth_secret.assign( |
| kEncryptionTestVectorsDraft03[i].auth_secret, |
| kEncryptionTestVectorsDraft03[i].auth_secret + kAuthSecretSize); |
| |
| salt.assign(kEncryptionTestVectorsDraft03[i].salt, |
| kEncryptionTestVectorsDraft03[i].salt + kSaltSize); |
| |
| ASSERT_TRUE(cryptographer_->Encrypt( |
| recipient_public_key_, sender_public_key_, ecdh_shared_secret, |
| auth_secret, salt, kEncryptionTestVectorsDraft03[i].input, &record_size, |
| &ciphertext)); |
| |
| base::Base64UrlEncode(ciphertext, base::Base64UrlEncodePolicy::OMIT_PADDING, |
| &output); |
| |
| EXPECT_EQ(kEncryptionTestVectorsDraft03[i].record_size, record_size); |
| EXPECT_EQ(kEncryptionTestVectorsDraft03[i].output, output); |
| } |
| } |
| |
| TEST_F(GCMMessageCryptographerTestVectorTest, DecryptionVectorsDraft03) { |
| std::string input, ecdh_shared_secret, auth_secret, salt, plaintext; |
| for (size_t i = 0; i < arraysize(kDecryptionTestVectorsDraft03); ++i) { |
| SCOPED_TRACE(i); |
| |
| ASSERT_TRUE(base::Base64UrlDecode( |
| kDecryptionTestVectorsDraft03[i].input, |
| base::Base64UrlDecodePolicy::IGNORE_PADDING, &input)); |
| |
| ecdh_shared_secret.assign( |
| kDecryptionTestVectorsDraft03[i].ecdh_shared_secret, |
| kDecryptionTestVectorsDraft03[i].ecdh_shared_secret + |
| kEcdhSharedSecretSize); |
| |
| auth_secret.assign( |
| kDecryptionTestVectorsDraft03[i].auth_secret, |
| kDecryptionTestVectorsDraft03[i].auth_secret + kAuthSecretSize); |
| |
| salt.assign(kDecryptionTestVectorsDraft03[i].salt, |
| kDecryptionTestVectorsDraft03[i].salt + kSaltSize); |
| |
| const bool has_output = kDecryptionTestVectorsDraft03[i].output; |
| const bool result = cryptographer_->Decrypt( |
| recipient_public_key_, sender_public_key_, ecdh_shared_secret, |
| auth_secret, salt, input, kDecryptionTestVectorsDraft03[i].record_size, |
| &plaintext); |
| |
| if (!has_output) { |
| EXPECT_FALSE(result); |
| continue; |
| } |
| |
| EXPECT_TRUE(result); |
| EXPECT_EQ(kDecryptionTestVectorsDraft03[i].output, plaintext); |
| } |
| } |
| |
| class GCMMessageCryptographerReferenceTest : public ::testing::Test { |
| protected: |
| // Computes the shared secret between the sender and the receiver. The sender |
| // must have a key-pair containing a X.509 SubjectPublicKeyInfo block and a |
| // ASN.1-encoded PKCS #8 EncryptedPrivateKeyInfo block, whereas the receiver |
| // must have a public key in uncompressed EC point format. |
| void ComputeSharedSecret(const char* encoded_sender_private_key, |
| const char* encoded_sender_public_key_x509, |
| const char* encoded_receiver_public_key, |
| std::string* shared_secret) const { |
| std::string sender_private_key, sender_public_key_x509, receiver_public_key; |
| ASSERT_TRUE(base::Base64UrlDecode( |
| encoded_sender_private_key, |
| base::Base64UrlDecodePolicy::IGNORE_PADDING, &sender_private_key)); |
| ASSERT_TRUE(base::Base64UrlDecode( |
| encoded_sender_public_key_x509, |
| base::Base64UrlDecodePolicy::IGNORE_PADDING, &sender_public_key_x509)); |
| ASSERT_TRUE(base::Base64UrlDecode( |
| encoded_receiver_public_key, |
| base::Base64UrlDecodePolicy::IGNORE_PADDING, &receiver_public_key)); |
| |
| ASSERT_TRUE(ComputeSharedP256Secret( |
| sender_private_key, sender_public_key_x509, receiver_public_key, |
| shared_secret)); |
| } |
| }; |
| |
| // Reference test included for the Version::DRAFT_03 implementation. |
| // https://tools.ietf.org/html/draft-ietf-webpush-encryption-03 |
| // https://tools.ietf.org/html/draft-ietf-httpbis-encryption-encoding-02 |
| TEST_F(GCMMessageCryptographerReferenceTest, ReferenceDraft03) { |
| // The 16-byte salt unique to the message. |
| const char kSalt[] = "lngarbyKfMoi9Z75xYXmkg"; |
| |
| // The 16-byte prearranged secret between the sender and receiver. |
| const char kAuthSecret[] = "R29vIGdvbyBnJyBqb29iIQ"; |
| |
| // The keying material used by the sender to encrypt the |kCiphertext|. |
| const char kSenderPrivate[] = |
| "MIGxMBwGCiqGSIb3DQEMAQMwDgQIh9aZ3UvuDloCAggABIGQZ-T8CJZe-no4mOTDgX1Gm986" |
| "Gsbe3mjJeABhA4KOmut_qJh5kt_DLqdNShiQr-afk3AdkX-fxLZdrcHiW9aWvBjnMAY65zg5" |
| "oHsuUaoEuG88Ksbku2u193OENWTQTsYaYE2O44qmRfsX773UNVcWXg_omwIbhbgf6tLZUZH_" |
| "dTC3YjzuxjbSP89HPEJ-eBXA"; |
| const char kSenderPublicKeyUncompressed[] = |
| "BNoRDbb84JGm8g5Z5CFxurSqsXWJ11ItfXEWYVLE85Y7CYkDjXsIEc4aqxYaQ1G8BqkXCJ6D" |
| "PpDrWtdWj_mugHU"; |
| const char kSenderPublicX509[] = |
| "MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAE2hENtvzgkabyDlnkIXG6tKqxdYnXUi19cRZh" |
| "UsTzljsJiQONewgRzhqrFhpDUbwGqRcInoM-kOta11aP-a6AdQ"; |
| |
| // The keying material used by the recipient to decrypt the |kCiphertext|. |
| const char kRecipientPrivate[] = |
| "MIGxMBwGCiqGSIb3DQEMAQMwDgQIqMt4d7uJdt4CAggABIGQeikRHE3CqUeF-uUtJno9BL0g" |
| "mNRyDihZe8P3nF_g-NYVzvdQowsXfYeza6OQOdDuMXxnGgNToVy2jsiWVN6rxCaSMTY622y8" |
| "ajW5voSdqC2PakQ8ZNTPNHarLDMC9NpgGKrUh8hfRLhvb7vtbKIWmx-22rQB5yTYdqzN2m7A" |
| "GHMWRnVk0mMzMsMjZqYFaa2D"; |
| const char kRecipientPublicKeyUncompressed[] = |
| "BCEkBjzL8Z3C-oi2Q7oE5t2Np-p7osjGLg93qUP0wvqRT21EEWyf0cQDQcakQMqz4hQKYOQ3" |
| "il2nNZct4HgAUQU"; |
| const char kRecipientPublicX509[] = |
| "MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEISQGPMvxncL6iLZDugTm3Y2n6nuiyMYuD3ep" |
| "Q_TC-pFPbUQRbJ_RxANBxqRAyrPiFApg5DeKXac1ly3geABRBQ"; |
| |
| // The ciphertext and associated plaintext of the message. |
| const char kCiphertext[] = "6nqAQUME8hNqw5J3kl8cpVVJylXKYqZOeseZG8UueKpA"; |
| const char kPlaintext[] = "I am the walrus"; |
| |
| std::string sender_shared_secret, receiver_shared_secret; |
| |
| // Compute the shared secrets between the sender and receiver's keys. |
| ASSERT_NO_FATAL_FAILURE(ComputeSharedSecret(kSenderPrivate, kSenderPublicX509, |
| kRecipientPublicKeyUncompressed, |
| &sender_shared_secret)); |
| ASSERT_NO_FATAL_FAILURE(ComputeSharedSecret( |
| kRecipientPrivate, kRecipientPublicX509, kSenderPublicKeyUncompressed, |
| &receiver_shared_secret)); |
| |
| ASSERT_GT(sender_shared_secret.size(), 0u); |
| ASSERT_EQ(sender_shared_secret, receiver_shared_secret); |
| |
| // Decode the public keys of both parties, the auth secret and the salt. |
| std::string recipient_public_key, sender_public_key, auth_secret, salt; |
| ASSERT_TRUE(base::Base64UrlDecode(kRecipientPublicKeyUncompressed, |
| base::Base64UrlDecodePolicy::IGNORE_PADDING, |
| &recipient_public_key)); |
| ASSERT_TRUE(base::Base64UrlDecode(kSenderPublicKeyUncompressed, |
| base::Base64UrlDecodePolicy::IGNORE_PADDING, |
| &sender_public_key)); |
| ASSERT_TRUE(base::Base64UrlDecode( |
| kAuthSecret, base::Base64UrlDecodePolicy::IGNORE_PADDING, &auth_secret)); |
| ASSERT_TRUE(base::Base64UrlDecode( |
| kSalt, base::Base64UrlDecodePolicy::IGNORE_PADDING, &salt)); |
| |
| std::string encoded_ciphertext, ciphertext, plaintext; |
| size_t record_size = 0; |
| |
| // Now verify that encrypting a message with the given information yields the |
| // expected ciphertext given the defined input. |
| GCMMessageCryptographer cryptographer( |
| GCMMessageCryptographer::Version::DRAFT_03); |
| |
| ASSERT_TRUE(cryptographer.Encrypt(recipient_public_key, sender_public_key, |
| sender_shared_secret, auth_secret, salt, |
| kPlaintext, &record_size, &ciphertext)); |
| |
| base::Base64UrlEncode(ciphertext, base::Base64UrlEncodePolicy::OMIT_PADDING, |
| &encoded_ciphertext); |
| ASSERT_EQ(kCiphertext, encoded_ciphertext); |
| |
| // And verify that decrypting the message yields the plaintext again. |
| ASSERT_TRUE(cryptographer.Decrypt(recipient_public_key, sender_public_key, |
| sender_shared_secret, auth_secret, salt, |
| ciphertext, record_size, &plaintext)); |
| |
| ASSERT_EQ(kPlaintext, plaintext); |
| } |
| |
| } // namespace gcm |