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// Copyright 2014 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 <stddef.h>
#include <stdint.h>
#include "base/macros.h"
#include "base/values.h"
#include "components/webcrypto/algorithm_dispatch.h"
#include "components/webcrypto/algorithms/test_helpers.h"
#include "components/webcrypto/crypto_data.h"
#include "components/webcrypto/status.h"
#include "third_party/WebKit/public/platform/WebCryptoAlgorithmParams.h"
#include "third_party/WebKit/public/platform/WebCryptoKeyAlgorithm.h"
namespace webcrypto {
namespace {
// Creates an AES-CTR algorithm for encryption/decryption.
blink::WebCryptoAlgorithm CreateAesCtrAlgorithm(
const std::vector<uint8_t>& counter,
uint8_t length_bits) {
return blink::WebCryptoAlgorithm::adoptParamsAndCreate(
blink::WebCryptoAlgorithmIdAesCtr,
new blink::WebCryptoAesCtrParams(length_bits, counter));
}
class WebCryptoAesCtrTest : public WebCryptoTestBase {};
TEST_F(WebCryptoAesCtrTest, EncryptDecryptKnownAnswer) {
std::unique_ptr<base::ListValue> tests;
ASSERT_TRUE(ReadJsonTestFileToList("aes_ctr.json", &tests));
for (size_t test_index = 0; test_index < tests->GetSize(); ++test_index) {
SCOPED_TRACE(test_index);
base::DictionaryValue* test;
ASSERT_TRUE(tests->GetDictionary(test_index, &test));
std::vector<uint8_t> test_key = GetBytesFromHexString(test, "key");
std::vector<uint8_t> test_counter = GetBytesFromHexString(test, "counter");
int counter_length_bits = 0;
ASSERT_TRUE(test->GetInteger("length", &counter_length_bits));
std::vector<uint8_t> test_plain_text =
GetBytesFromHexString(test, "plain_text");
std::vector<uint8_t> test_cipher_text =
GetBytesFromHexString(test, "cipher_text");
blink::WebCryptoKey key = ImportSecretKeyFromRaw(
test_key, CreateAlgorithm(blink::WebCryptoAlgorithmIdAesCtr),
blink::WebCryptoKeyUsageEncrypt | blink::WebCryptoKeyUsageDecrypt);
EXPECT_EQ(test_key.size() * 8, key.algorithm().aesParams()->lengthBits());
std::vector<uint8_t> output;
// Test encryption.
EXPECT_EQ(Status::Success(),
Encrypt(CreateAesCtrAlgorithm(test_counter, counter_length_bits),
key, CryptoData(test_plain_text), &output));
EXPECT_BYTES_EQ(test_cipher_text, output);
// Test decryption.
EXPECT_EQ(Status::Success(),
Decrypt(CreateAesCtrAlgorithm(test_counter, counter_length_bits),
key, CryptoData(test_cipher_text), &output));
EXPECT_BYTES_EQ(test_plain_text, output);
}
}
// The counter block must be exactly 16 bytes.
TEST_F(WebCryptoAesCtrTest, InvalidCounterBlockLength) {
const unsigned int kBadCounterBlockLengthBytes[] = {0, 15, 17};
blink::WebCryptoKey key = ImportSecretKeyFromRaw(
std::vector<uint8_t>(16), // 128-bit key of all zeros.
CreateAlgorithm(blink::WebCryptoAlgorithmIdAesCtr),
blink::WebCryptoKeyUsageEncrypt | blink::WebCryptoKeyUsageDecrypt);
std::vector<uint8_t> input(32);
std::vector<uint8_t> output;
for (size_t i = 0; i < arraysize(kBadCounterBlockLengthBytes); ++i) {
std::vector<uint8_t> bad_counter(kBadCounterBlockLengthBytes[i]);
EXPECT_EQ(Status::ErrorIncorrectSizeAesCtrCounter(),
Encrypt(CreateAesCtrAlgorithm(bad_counter, 128), key,
CryptoData(input), &output));
EXPECT_EQ(Status::ErrorIncorrectSizeAesCtrCounter(),
Decrypt(CreateAesCtrAlgorithm(bad_counter, 128), key,
CryptoData(input), &output));
}
}
// The counter length cannot be less than 1 or greater than 128.
TEST_F(WebCryptoAesCtrTest, InvalidCounterLength) {
const uint8_t kBadCounterLengthBits[] = {0, 129};
blink::WebCryptoKey key = ImportSecretKeyFromRaw(
std::vector<uint8_t>(16), // 128-bit key of all zeros.
CreateAlgorithm(blink::WebCryptoAlgorithmIdAesCtr),
blink::WebCryptoKeyUsageEncrypt | blink::WebCryptoKeyUsageDecrypt);
std::vector<uint8_t> counter(16);
std::vector<uint8_t> input(32);
std::vector<uint8_t> output;
for (size_t i = 0; i < arraysize(kBadCounterLengthBits); ++i) {
uint8_t bad_counter_length_bits = kBadCounterLengthBits[i];
EXPECT_EQ(Status::ErrorInvalidAesCtrCounterLength(),
Encrypt(CreateAesCtrAlgorithm(counter, bad_counter_length_bits),
key, CryptoData(input), &output));
EXPECT_EQ(Status::ErrorInvalidAesCtrCounterLength(),
Decrypt(CreateAesCtrAlgorithm(counter, bad_counter_length_bits),
key, CryptoData(input), &output));
}
}
// Tests wrap-around using a 4-bit counter.
//
// Wrap-around is allowed, however if the counter repeats itself an error should
// be thrown.
//
// Using a 4-bit counter it is possible to encrypt 16 blocks. However the 17th
// block would end up wrapping back to the starting value.
TEST_F(WebCryptoAesCtrTest, OverflowAndRepeatCounter) {
const uint8_t kCounterLengthBits = 4;
const uint8_t kStartCounter[] = {0, 1, 15};
blink::WebCryptoKey key = ImportSecretKeyFromRaw(
std::vector<uint8_t>(16), // 128-bit key of all zeros.
CreateAlgorithm(blink::WebCryptoAlgorithmIdAesCtr),
blink::WebCryptoKeyUsageEncrypt | blink::WebCryptoKeyUsageDecrypt);
std::vector<uint8_t> buffer(272);
// 16 and 17 AES blocks worth of data respectively (AES blocks are 16 bytes
// long).
CryptoData input_16(buffer.data(), 256);
CryptoData input_17(buffer.data(), 272);
std::vector<uint8_t> output;
for (size_t i = 0; i < arraysize(kStartCounter); ++i) {
std::vector<uint8_t> counter(16);
counter[15] = kStartCounter[i];
// Baseline test: Encrypting 16 blocks should work (don't bother to check
// output, the known answer tests already do that).
EXPECT_EQ(Status::Success(),
Encrypt(CreateAesCtrAlgorithm(counter, kCounterLengthBits), key,
input_16, &output));
// Encrypting/Decrypting 17 however should fail.
EXPECT_EQ(Status::ErrorAesCtrInputTooLongCounterRepeated(),
Encrypt(CreateAesCtrAlgorithm(counter, kCounterLengthBits), key,
input_17, &output));
EXPECT_EQ(Status::ErrorAesCtrInputTooLongCounterRepeated(),
Decrypt(CreateAesCtrAlgorithm(counter, kCounterLengthBits), key,
input_17, &output));
}
}
} // namespace
} // namespace webcrypto
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