| // 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 <stddef.h> |
| |
| #include <memory> |
| |
| #include "base/base64url.h" |
| #include "base/macros.h" |
| #include "base/strings/string_util.h" |
| #include "components/gcm_driver/crypto/p256_key_util.h" |
| #include "crypto/random.h" |
| #include "crypto/symmetric_key.h" |
| #include "testing/gtest/include/gtest/gtest.h" |
| |
| namespace gcm { |
| |
| namespace { |
| |
| // The number of bits of the key in AEAD_AES_128_GCM. |
| const size_t kKeySizeBits = 128; |
| |
| // Example plaintext data to use in the tests. |
| const char kExamplePlaintext[] = "Example plaintext"; |
| |
| // Fixed local and peer public keys must be used to get consistent results. |
| const char kLocalPublicKeyCommon[] = |
| "BIXzEKOFquzVlr_1tS1bhmobZU3IJq2bswDflMJsizixqd_HFSvCJaCAotNjBw6A-iKQk7FshA" |
| "jdAA-T9Rh1a7U"; |
| |
| const char kPeerPublicKeyCommon[] = |
| "BAuzSrdIyKZsHnuOhqklkIKi6fl65V9OdPy6nFwI2SywL5-6I5SkkDtfIL9y7NkoEE345jv2Eo" |
| "5n4NIbLJIBjTM"; |
| |
| const char kAuthSecretCommon[] = "MyAuthenticationSecret"; |
| |
| // A test vector contains the information necessary to either encrypt or decrypt |
| // a message. These vectors were created using a JavaScript implementation of |
| // the same RFCs that the GCMMessageCryptographer implements. |
| struct TestVector { |
| const char* const input; |
| const char* const key; |
| const char* const salt; |
| size_t record_size; |
| const char* const output; |
| }; |
| |
| const TestVector kEncryptionTestVectors[] = { |
| // Simple message. |
| { "Hello, world!", |
| "AhA6n2oFYPWIh-cXwyv1m2C0JvmjHB4ZkXj8QylESXU", |
| "tsJYqAGvFDk6lDEv7daecw", |
| 4096, |
| "FgWrrnZq79oI_N4ORkVLHx1jfVmjeiIk-xFX8PzVuA" |
| }, |
| // Empty message. |
| { "", |
| "lMyvTong4VR053jfCpWmMDGW5dEDAqiTZUIU-inhTjU", |
| "wH3uvZqcN6oey9whiGpn1A", |
| 4096, |
| "MTI9zZ8CJTUzbZ4qNDoQZs0k" |
| }, |
| // Message with an invalid salt size. |
| { "Hello, world!", |
| "CcdxzkR6z1EY9vSrM7_IxYVxDxu46hV638EZQTPd7XI", |
| "aRr1fI1YSGVi5XU", |
| 4096, |
| nullptr // expected to fail |
| } |
| }; |
| |
| const TestVector kDecryptionTestVectors[] = { |
| // Simple message. |
| { "ceiEu_YpmqLoakD4smdzvy2XKRQrJ9vBzB2aqYEfzw", |
| "47ZytAw9qHlm-Q8g-7rH81rUPzaCgGcoFvlS1qxQtQk", |
| "EuR7EVetcaWpndXd_dKeyA", |
| 4096, |
| "Hello, world!" |
| }, |
| // Simple message with 16 bytes of padding. |
| { "WSf6fz1O0aIJyaPTCnvk83OqIQxsRKeFOvblPLsPpFB_1AV9ROk09TE1cGrB6zQ", |
| "MYSsNybwrTzRIzQYUq_yFPc6ugcTrJdEZJDM4NswvUg", |
| "8sEAMQYnufo2UkKl80cUGQ", |
| 4096, |
| "Hello, world!" |
| }, |
| // Empty message. |
| { "Ur3vHedGDO5IPYDvbhHYjbjG", |
| "S3-Ki_-XtzR66gUp_zR75CC5JXO62pyr5fWfneTYwFE", |
| "4RM6s19jJHdmqiVEJDp9jg", |
| 4096, |
| "" |
| }, |
| // Message with an invalid salt size. |
| { "iGrOpmJC5XTTf7wtgdhZ_qT", |
| "wW3Iy5ma803lLd-ysPdHUe2NB3HqXbY0XhCCdG5Y1Gw", |
| "N7oMH_xohAhMhOY", |
| 4096, |
| nullptr // expected to fail |
| }, |
| // Message with an invalid record size. |
| { "iGrOpmJC5XTTf7wtgdhZ_qT", |
| "kR5BMfqMKOD1yrLKE2giObXHI7merrMtnoO2oqneqXA", |
| "SQeJSPrqHvTdSfAMF8bBzQ", |
| 8, |
| nullptr // expected to fail |
| }, |
| // Message with multiple (2) records. |
| { "RqQVHRXlfYjzW9xhzh3V_KijLKjZiKzGXosqN_IaMzi0zI0tXXhC1urtrk3iWRoqttNXpkD2r" |
| "UCgLy8A1FnTjw", |
| "W3W4gx7sqcfmBnvNNdO9d4MBCC1bvJkvsNjZOGD-CCg", |
| "xG0TPGi9aIcxjpXKmaYBBQ", |
| 7, |
| nullptr // expected to fail |
| } |
| }; |
| |
| } // namespace |
| |
| class GCMMessageCryptographerTest : public ::testing::Test { |
| public: |
| void SetUp() override { |
| std::unique_ptr<crypto::SymmetricKey> random_key( |
| crypto::SymmetricKey::GenerateRandomKey(crypto::SymmetricKey::AES, |
| kKeySizeBits)); |
| |
| ASSERT_TRUE(random_key->GetRawKey(&key_)); |
| |
| std::string local_public_key, peer_public_key; |
| ASSERT_TRUE(base::Base64UrlDecode( |
| kLocalPublicKeyCommon, base::Base64UrlDecodePolicy::IGNORE_PADDING, |
| &local_public_key)); |
| ASSERT_TRUE(base::Base64UrlDecode( |
| kPeerPublicKeyCommon, base::Base64UrlDecodePolicy::IGNORE_PADDING, |
| &peer_public_key)); |
| |
| cryptographer_.reset( |
| new GCMMessageCryptographer(GCMMessageCryptographer::Label::P256, |
| local_public_key, peer_public_key, |
| kAuthSecretCommon)); |
| } |
| |
| protected: |
| // Generates a cryptographically secure random salt of 16-octets in size, the |
| // required length as expected by the HKDF. |
| std::string GenerateRandomSalt() { |
| const size_t kSaltSize = 16; |
| |
| std::string salt; |
| |
| crypto::RandBytes(base::WriteInto(&salt, kSaltSize + 1), kSaltSize); |
| return salt; |
| } |
| |
| GCMMessageCryptographer* cryptographer() { return cryptographer_.get(); } |
| |
| base::StringPiece key() const { return key_; } |
| |
| private: |
| std::unique_ptr<GCMMessageCryptographer> cryptographer_; |
| |
| std::string key_; |
| }; |
| |
| TEST_F(GCMMessageCryptographerTest, RoundTrip) { |
| const std::string salt = GenerateRandomSalt(); |
| |
| size_t record_size = 0; |
| |
| std::string ciphertext, plaintext; |
| ASSERT_TRUE(cryptographer()->Encrypt(kExamplePlaintext, key(), salt, |
| &record_size, &ciphertext)); |
| |
| EXPECT_GT(record_size, ciphertext.size() - 16); |
| EXPECT_GT(ciphertext.size(), 0u); |
| |
| ASSERT_TRUE(cryptographer()->Decrypt(ciphertext, key(), salt, 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(message, key(), salt, &record_size, |
| &ciphertext)); |
| |
| EXPECT_GT(record_size, ciphertext.size() - 16); |
| EXPECT_GT(ciphertext.size(), 0u); |
| |
| ASSERT_TRUE(cryptographer()->Decrypt(ciphertext, key(), salt, 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(kExamplePlaintext, key(), salt, |
| &record_size, &ciphertext)); |
| |
| EXPECT_GT(record_size, ciphertext.size() - 16); |
| EXPECT_FALSE(cryptographer()->Decrypt(ciphertext, key(), salt, |
| 0 /* record_size */, &plaintext)); |
| |
| EXPECT_FALSE(cryptographer()->Decrypt(ciphertext, key(), salt, |
| ciphertext.size() - 17, &plaintext)); |
| |
| EXPECT_TRUE(cryptographer()->Decrypt(ciphertext, key(), salt, |
| 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()->DerivePseudoRandomKey(key()); |
| const std::string nonce = cryptographer()->DeriveNonce(prk, salt); |
| const std::string content_encryption_key = |
| cryptographer()->DeriveContentEncryptionKey(prk, salt); |
| |
| ASSERT_GT(message.size(), 1u); |
| const size_t record_size = message.size() + 1; |
| |
| std::string ciphertext, plaintext; |
| ASSERT_TRUE(cryptographer()->EncryptDecryptRecordInternal( |
| GCMMessageCryptographer::ENCRYPT, message, content_encryption_key, nonce, |
| &ciphertext)); |
| |
| ASSERT_TRUE(cryptographer()->Decrypt(ciphertext, key(), salt, 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()->EncryptDecryptRecordInternal( |
| GCMMessageCryptographer::ENCRYPT, message, content_encryption_key, nonce, |
| &ciphertext)); |
| |
| ASSERT_FALSE(cryptographer()->Decrypt(ciphertext, key(), salt, 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()->EncryptDecryptRecordInternal( |
| GCMMessageCryptographer::ENCRYPT, message, content_encryption_key, nonce, |
| &ciphertext)); |
| |
| ASSERT_FALSE(cryptographer()->Decrypt(ciphertext, key(), salt, 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()->EncryptDecryptRecordInternal( |
| GCMMessageCryptographer::ENCRYPT, message, content_encryption_key, nonce, |
| &ciphertext)); |
| |
| ASSERT_FALSE(cryptographer()->Decrypt(ciphertext, key(), salt, record_size, |
| &plaintext)); |
| } |
| |
| TEST_F(GCMMessageCryptographerTest, EncryptionTestVectors) { |
| std::string key, salt, output, ciphertext; |
| size_t record_size = 0; |
| |
| for (size_t i = 0; i < arraysize(kEncryptionTestVectors); ++i) { |
| SCOPED_TRACE(i); |
| |
| ASSERT_TRUE(base::Base64UrlDecode( |
| kEncryptionTestVectors[i].key, |
| base::Base64UrlDecodePolicy::IGNORE_PADDING, &key)); |
| ASSERT_TRUE(base::Base64UrlDecode( |
| kEncryptionTestVectors[i].salt, |
| base::Base64UrlDecodePolicy::IGNORE_PADDING, &salt)); |
| |
| const bool has_output = kEncryptionTestVectors[i].output; |
| const bool result = cryptographer()->Encrypt( |
| kEncryptionTestVectors[i].input, key, salt, &record_size, &ciphertext); |
| |
| if (!has_output) { |
| EXPECT_FALSE(result); |
| continue; |
| } |
| |
| EXPECT_TRUE(result); |
| ASSERT_TRUE(base::Base64UrlDecode( |
| kEncryptionTestVectors[i].output, |
| base::Base64UrlDecodePolicy::IGNORE_PADDING, &output)); |
| |
| EXPECT_EQ(kEncryptionTestVectors[i].record_size, record_size); |
| EXPECT_EQ(output, ciphertext); |
| } |
| } |
| |
| TEST_F(GCMMessageCryptographerTest, DecryptionTestVectors) { |
| std::string input, key, salt, plaintext; |
| for (size_t i = 0; i < arraysize(kDecryptionTestVectors); ++i) { |
| SCOPED_TRACE(i); |
| |
| ASSERT_TRUE(base::Base64UrlDecode( |
| kDecryptionTestVectors[i].input, |
| base::Base64UrlDecodePolicy::IGNORE_PADDING, &input)); |
| ASSERT_TRUE(base::Base64UrlDecode( |
| kDecryptionTestVectors[i].key, |
| base::Base64UrlDecodePolicy::IGNORE_PADDING, &key)); |
| ASSERT_TRUE(base::Base64UrlDecode( |
| kDecryptionTestVectors[i].salt, |
| base::Base64UrlDecodePolicy::IGNORE_PADDING, &salt)); |
| |
| const bool has_output = kDecryptionTestVectors[i].output; |
| const bool result = cryptographer()->Decrypt( |
| input, key, salt, kDecryptionTestVectors[i].record_size, &plaintext); |
| |
| if (!has_output) { |
| EXPECT_FALSE(result); |
| continue; |
| } |
| |
| EXPECT_TRUE(result); |
| EXPECT_EQ(kDecryptionTestVectors[i].output, plaintext); |
| } |
| } |
| |
| TEST_F(GCMMessageCryptographerTest, AuthSecretAffectsIKM) { |
| std::string public_key; |
| ASSERT_TRUE(base::Base64UrlDecode( |
| kLocalPublicKeyCommon, base::Base64UrlDecodePolicy::IGNORE_PADDING, |
| &public_key)); |
| |
| // Fake IKM to use in the DerivePseudoRandomKey calls. |
| const char kFakeIKM[] = "HelloWorld"; |
| |
| GCMMessageCryptographer hello_cryptographer( |
| GCMMessageCryptographer::Label::P256, public_key, public_key, "Hello"); |
| |
| GCMMessageCryptographer world_cryptographer( |
| GCMMessageCryptographer::Label::P256, public_key, public_key, "World"); |
| |
| ASSERT_NE(hello_cryptographer.DerivePseudoRandomKey(kFakeIKM), kFakeIKM); |
| ASSERT_NE(world_cryptographer.DerivePseudoRandomKey(kFakeIKM), kFakeIKM); |
| |
| ASSERT_NE(hello_cryptographer.DerivePseudoRandomKey(kFakeIKM), |
| world_cryptographer.DerivePseudoRandomKey(kFakeIKM)); |
| |
| std::string salt = GenerateRandomSalt(); |
| |
| // Verify that the IKM actually gets used by the transformations. |
| size_t hello_record_size, world_record_size; |
| std::string hello_ciphertext, world_ciphertext; |
| |
| ASSERT_TRUE(hello_cryptographer.Encrypt(kExamplePlaintext, key(), salt, |
| &hello_record_size, |
| &hello_ciphertext)); |
| ASSERT_TRUE(world_cryptographer.Encrypt(kExamplePlaintext, key(), salt, |
| &world_record_size, |
| &world_ciphertext)); |
| |
| // If the ciphertexts differ despite the same key and salt, it got used. |
| ASSERT_NE(hello_ciphertext, world_ciphertext); |
| |
| // 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 hello_plaintext, world_plaintext; |
| |
| ASSERT_TRUE(hello_cryptographer.Decrypt(hello_ciphertext, key(), salt, |
| hello_record_size, &hello_plaintext)); |
| ASSERT_TRUE(world_cryptographer.Decrypt(world_ciphertext, key(), salt, |
| world_record_size, &world_plaintext)); |
| |
| EXPECT_EQ(kExamplePlaintext, hello_plaintext); |
| EXPECT_EQ(kExamplePlaintext, world_plaintext); |
| } |
| |
| // Common infrastructure for reference tests against the examples in the draft: |
| // https://tools.ietf.org/html/draft-thomson-http-encryption |
| class GCMMessageCryptographerReferenceTest |
| : public GCMMessageCryptographerTest { |
| 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)); |
| } |
| |
| // Creates a new cryptographer based on the P-256 curve with the given public |
| // keys of the sender and receiver, and optionally, the authentication secret. |
| // The public keys must be given as uncompressed P-256 EC points. |
| void CreateCryptographer( |
| const char* encoded_receiver_public_key, |
| const char* encoded_sender_public_key, |
| const char* encoded_auth_secret, |
| std::unique_ptr<GCMMessageCryptographer>* cryptographer) const { |
| std::string receiver_public_key, sender_public_key, auth_secret; |
| ASSERT_TRUE(base::Base64UrlDecode( |
| encoded_receiver_public_key, |
| base::Base64UrlDecodePolicy::IGNORE_PADDING, &receiver_public_key)); |
| ASSERT_TRUE(base::Base64UrlDecode( |
| encoded_sender_public_key, |
| base::Base64UrlDecodePolicy::IGNORE_PADDING, &sender_public_key)); |
| |
| if (encoded_auth_secret) { |
| ASSERT_TRUE(base::Base64UrlDecode( |
| encoded_auth_secret, |
| base::Base64UrlDecodePolicy::IGNORE_PADDING, &auth_secret)); |
| } |
| |
| std::unique_ptr<GCMMessageCryptographer> instance( |
| new GCMMessageCryptographer(GCMMessageCryptographer::Label::P256, |
| receiver_public_key, sender_public_key, |
| auth_secret)); |
| |
| if (auth_secret.empty()) |
| instance->set_allow_empty_auth_secret_for_tests(true); |
| |
| cryptographer->swap(instance); |
| } |
| }; |
| |
| TEST_F(GCMMessageCryptographerReferenceTest, WithAuthSecret) { |
| // 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 kSenderPublicUncompressed[] = |
| "BNoRDbb84JGm8g5Z5CFxurSqsXWJ11ItfXEWYVLE85Y7CYkDjXsIEc4aqxYaQ1G8BqkXCJ6D" |
| "PpDrWtdWj_mugHU"; |
| const char kSenderPublicX509[] = |
| "MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAE2hENtvzgkabyDlnkIXG6tKqxdYnXUi19cRZh" |
| "UsTzljsJiQONewgRzhqrFhpDUbwGqRcInoM-kOta11aP-a6AdQ"; |
| |
| // The keying material used by the client to decrypt the |kCiphertext|. |
| const char kReceiverPrivate[] = |
| "MIGxMBwGCiqGSIb3DQEMAQMwDgQIqMt4d7uJdt4CAggABIGQeikRHE3CqUeF-uUtJno9BL0g" |
| "mNRyDihZe8P3nF_g-NYVzvdQowsXfYeza6OQOdDuMXxnGgNToVy2jsiWVN6rxCaSMTY622y8" |
| "ajW5voSdqC2PakQ8ZNTPNHarLDMC9NpgGKrUh8hfRLhvb7vtbKIWmx-22rQB5yTYdqzN2m7A" |
| "GHMWRnVk0mMzMsMjZqYFaa2D"; |
| const char kReceiverPublicUncompressed[] = |
| "BCEkBjzL8Z3C-oi2Q7oE5t2Np-p7osjGLg93qUP0wvqRT21EEWyf0cQDQcakQMqz4hQKYOQ3" |
| "il2nNZct4HgAUQU"; |
| const char kReceiverPublicX509[] = |
| "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, kReceiverPublicUncompressed, |
| &sender_shared_secret)); |
| ASSERT_NO_FATAL_FAILURE(ComputeSharedSecret( |
| kReceiverPrivate, kReceiverPublicX509, kSenderPublicUncompressed, |
| &receiver_shared_secret)); |
| |
| ASSERT_GT(sender_shared_secret.size(), 0u); |
| ASSERT_EQ(sender_shared_secret, receiver_shared_secret); |
| |
| std::unique_ptr<GCMMessageCryptographer> cryptographer; |
| ASSERT_NO_FATAL_FAILURE(CreateCryptographer( |
| kReceiverPublicUncompressed, kSenderPublicUncompressed, kAuthSecret, |
| &cryptographer)); |
| |
| std::string salt; |
| ASSERT_TRUE(base::Base64UrlDecode( |
| kSalt, base::Base64UrlDecodePolicy::IGNORE_PADDING, &salt)); |
| |
| std::string encoded_ciphertext, ciphertext, plaintext; |
| size_t record_size = 0; |
| |
| // Verify that encrypting |kPlaintext| yields the expected |kCiphertext|. |
| ASSERT_TRUE(cryptographer->Encrypt(kPlaintext, sender_shared_secret, salt, |
| &record_size, &ciphertext)); |
| |
| base::Base64UrlEncode(ciphertext, base::Base64UrlEncodePolicy::OMIT_PADDING, |
| &encoded_ciphertext); |
| ASSERT_EQ(kCiphertext, encoded_ciphertext); |
| |
| // Verify that decrypting |kCiphertext| yields the expected |kPlaintext|. |
| ASSERT_TRUE(cryptographer->Decrypt(ciphertext, sender_shared_secret, salt, |
| record_size, &plaintext)); |
| ASSERT_EQ(kPlaintext, plaintext); |
| } |
| |
| TEST_F(GCMMessageCryptographerReferenceTest, WithoutAuthSecret) { |
| // The 16-byte salt unique to the message. |
| const char kSalt[] = "Qg61ZJRva_XBE9IEUelU3A"; |
| |
| // The keying material used by the sender to encrypt the |kCiphertext|. |
| const char kSenderPrivate[] = |
| "MIGxMBwGCiqGSIb3DQEMAQMwDgQIFfJ62c9VwXgCAggABIGQkRxDRPQjwuWp1C3-z1pYTDqF" |
| "_NZ1kbPsjmkC3JSv02oAYHtBAtKa2e3oAPqsPfCvoCJBJs6G4WY4EuEO1YFL6RKpNl3DpIUc" |
| "v9ShR27p_je_nyLpNBAxn2drnjlF_K6s4gcJmcvCxuNjAwOlLMPvQqGjOR2K_oMs1Hdq0EKJ" |
| "NwWt3WUVEpuQF_WhYjCVIeGO"; |
| const char kSenderPublicUncompressed[] = |
| "BDgpRKok2GZZDmS4r63vbJSUtcQx4Fq1V58-6-3NbZzSTlZsQiCEDTQy3CZ0ZMsqeqsEb7qW" |
| "2blQHA4S48fynTk"; |
| const char kSenderPublicX509[] = |
| "MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEOClEqiTYZlkOZLivre9slJS1xDHgWrVXnz7r" |
| "7c1tnNJOVmxCIIQNNDLcJnRkyyp6qwRvupbZuVAcDhLjx_KdOQ"; |
| |
| // The keying material used by the client to decrypt the |kCiphertext|. |
| const char kReceiverPrivate[] = |
| "MIGxMBwGCiqGSIb3DQEMAQMwDgQIqMt4d7uJdt4CAggABIGQeikRHE3CqUeF-uUtJno9BL0g" |
| "mNRyDihZe8P3nF_g-NYVzvdQowsXfYeza6OQOdDuMXxnGgNToVy2jsiWVN6rxCaSMTY622y8" |
| "ajW5voSdqC2PakQ8ZNTPNHarLDMC9NpgGKrUh8hfRLhvb7vtbKIWmx-22rQB5yTYdqzN2m7A" |
| "GHMWRnVk0mMzMsMjZqYFaa2D"; |
| const char kReceiverPublicUncompressed[] = |
| "BCEkBjzL8Z3C-oi2Q7oE5t2Np-p7osjGLg93qUP0wvqRT21EEWyf0cQDQcakQMqz4hQKYOQ3" |
| "il2nNZct4HgAUQU"; |
| const char kReceiverPublicX509[] = |
| "MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEISQGPMvxncL6iLZDugTm3Y2n6nuiyMYuD3ep" |
| "Q_TC-pFPbUQRbJ_RxANBxqRAyrPiFApg5DeKXac1ly3geABRBQ"; |
| |
| // The ciphertext and associated plaintext of the message. |
| const char kCiphertext[] = "yqD2bapcx14XxUbtwjiGx69eHE3Yd6AqXcwBpT2Kd1uy"; |
| 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, kReceiverPublicUncompressed, |
| &sender_shared_secret)); |
| ASSERT_NO_FATAL_FAILURE(ComputeSharedSecret( |
| kReceiverPrivate, kReceiverPublicX509, kSenderPublicUncompressed, |
| &receiver_shared_secret)); |
| |
| ASSERT_GT(sender_shared_secret.size(), 0u); |
| ASSERT_EQ(sender_shared_secret, receiver_shared_secret); |
| |
| std::unique_ptr<GCMMessageCryptographer> cryptographer; |
| ASSERT_NO_FATAL_FAILURE(CreateCryptographer( |
| kReceiverPublicUncompressed, kSenderPublicUncompressed, |
| nullptr /* auth_secret */, &cryptographer)); |
| |
| std::string salt; |
| ASSERT_TRUE(base::Base64UrlDecode( |
| kSalt, base::Base64UrlDecodePolicy::IGNORE_PADDING, &salt)); |
| |
| std::string encoded_ciphertext, ciphertext, plaintext; |
| size_t record_size = 0; |
| |
| // Verify that encrypting |kPlaintext| yields the expected |kCiphertext|. |
| ASSERT_TRUE(cryptographer->Encrypt(kPlaintext, sender_shared_secret, salt, |
| &record_size, &ciphertext)); |
| |
| base::Base64UrlEncode(ciphertext, base::Base64UrlEncodePolicy::OMIT_PADDING, |
| &encoded_ciphertext); |
| ASSERT_EQ(kCiphertext, encoded_ciphertext); |
| |
| // Verify that decrypting |kCiphertext| yields the expected |kPlaintext|. |
| ASSERT_TRUE(cryptographer->Decrypt(ciphertext, sender_shared_secret, salt, |
| record_size, &plaintext)); |
| ASSERT_EQ(kPlaintext, plaintext); |
| } |
| |
| } // namespace gcm |
