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// Copyright 2014 The Chromium Authors
// 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 <array>
#include "base/containers/span.h"
#include "components/webcrypto/algorithm_dispatch.h"
#include "components/webcrypto/algorithms/test_helpers.h"
#include "components/webcrypto/status.h"
#include "third_party/blink/public/platform/web_crypto_algorithm_params.h"
#include "third_party/blink/public/platform/web_crypto_key_algorithm.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::kWebCryptoAlgorithmIdAesCtr,
new blink::WebCryptoAesCtrParams(length_bits, counter));
}
blink::WebCryptoKey AesCtrKeyFromBytes(const std::vector<uint8_t>& bytes) {
blink::WebCryptoKey key = ImportSecretKeyFromRaw(
bytes, CreateAlgorithm(blink::kWebCryptoAlgorithmIdAesCtr),
blink::kWebCryptoKeyUsageEncrypt | blink::kWebCryptoKeyUsageDecrypt);
EXPECT_EQ(bytes.size() * 8, key.Algorithm().AesParams()->LengthBits());
return key;
}
class WebCryptoAesCtrTest : public WebCryptoTestBase {};
struct AesCtrKnownAnswer {
const char* key;
const char* plaintext;
const char* counter;
size_t counter_length;
const char* ciphertext;
};
const char k128BitTestKey[] = "7691BE035E5020A8AC6E618529F9A0DC";
const char k256BitTestKey[] =
"F6D66D6BD52D59BB0796365879EFF886C66DD51A5B6A99744B50590C87A23884";
constexpr auto kAesCtrKnownAnswers = std::to_array<AesCtrKnownAnswer>({
// RFC 3686 test vector #3:
{k128BitTestKey,
"000102030405060708090A0B0C0D0E0F101112131415161718191A1B1C1D1E1F20212223",
"00E0017B27777F3F4A1786F000000001", 32,
"C1CF48A89F2FFDD9CF4652E9EFDB72D74540A42BDE6D7836D59A5CEAAEF3105325B2072"
"F"},
// RFC 3686 test vector #8:
{k256BitTestKey,
"000102030405060708090A0B0C0D0E0F101112131415161718191A1B1C1D1E1F",
"00FAAC24C1585EF15A43D87500000001", 32,
"F05E231B3894612C49EE000B804EB2A9B8306B508F839D6A5530831D9344AF1C"},
// Empty plaintext, same key as above:
{k256BitTestKey, "", "00FAAC24C1585EF15A43D87500000001", 32, ""},
// 32-bit counter wraparound:
{k256BitTestKey,
"F05E231B3894612C49EE000B804EB2A9B8306B508F839D6A5530831D9344AF1CC1CF48A89"
"F2FFDD9CF4652E9EFDB72D7",
"00FAAC24C1585EF15A43D875FFFFFFFF", 32,
"2E32E02FF9E69A1D6B78AC4308A67592C5DD5505589B79183D4189619A1467E4319069B0A"
"3BE9AF28EA158E96398CE71"},
// 1-bit counter wraparound:
{k128BitTestKey,
"C05E231B3894612C49EE000B804EB2A6B8306B508F839D6A5530831D9344AF1C",
"00FAAC24C1585EF15A43D875000000FF", 1,
"52334727723A84F4278FB319386CD7B5587DD8B2D9AA394D83EF8A826C4761AA"},
// 4-bit counter wraparound:
{k128BitTestKey,
"C05E231B3894612C49EE000B804EB2A6B8306B508F839D6A5530831D9344AF1C141516171"
"8191A1B1C1D1E1F20212223",
"00FAAC24C1585EF15A43D8750000111E", 4,
"5573894046DEF46162ED54966A22D8F0517B61A0CE7E657A5A5124A7F62AAE149A3C78567"
"11C59D67F34F31374CF7A72"},
// same, but plaintext is not a multiple of block size:
{k128BitTestKey,
"C05E231B3894612C49EE000B804EB2A6B8306B508F839D6A5530831D9344AF1C141516171"
"8191A1B1C1D1E1F20",
"00FAAC24C1585EF15A43D8750000111E", 4,
"5573894046DEF46162ED54966A22D8F0517B61A0CE7E657A5A5124A7F62AAE149A3C78567"
"11C59D67F34F31374"},
// 128-bit counter wraparound:
{k128BitTestKey,
"C05E231B3894612C49EE000B804EB2A6B8306B508F839D6A5530831D9344AF1C141516171"
"8191A1B1C1D1E1F20212223",
"FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFE", 128,
"D2C49B275BC73814DC90ECE98959041C9A3481F2247E08B0AF5D8DE3F521C9DAF535B0A81"
"56DF9D2370EE7328103C8AD"},
});
TEST_F(WebCryptoAesCtrTest, EncryptDecryptKnownAnswer) {
for (const auto& test : kAesCtrKnownAnswers) {
SCOPED_TRACE(&test - &kAesCtrKnownAnswers[0]);
std::vector<uint8_t> key_bytes = HexStringToBytes(test.key);
std::vector<uint8_t> counter = HexStringToBytes(test.counter);
std::vector<uint8_t> plaintext = HexStringToBytes(test.plaintext);
std::vector<uint8_t> ciphertext = HexStringToBytes(test.ciphertext);
blink::WebCryptoKey key = AesCtrKeyFromBytes(key_bytes);
std::vector<uint8_t> output;
// Test encryption.
EXPECT_EQ(Status::Success(),
Encrypt(CreateAesCtrAlgorithm(counter, test.counter_length), key,
plaintext, &output));
EXPECT_EQ(ciphertext, output);
// Test decryption.
EXPECT_EQ(Status::Success(),
Decrypt(CreateAesCtrAlgorithm(counter, test.counter_length), key,
ciphertext, &output));
EXPECT_EQ(plaintext, output);
}
}
// The counter block must be exactly 16 bytes.
TEST_F(WebCryptoAesCtrTest, InvalidCounterBlockLength) {
blink::WebCryptoKey key = AesCtrKeyFromBytes(std::vector<uint8_t>(16));
std::vector<uint8_t> input(32);
std::vector<uint8_t> output;
for (size_t bad_length : {0, 15, 17}) {
std::vector<uint8_t> bad_counter(bad_length);
EXPECT_EQ(
Status::ErrorIncorrectSizeAesCtrCounter(),
Encrypt(CreateAesCtrAlgorithm(bad_counter, 128), key, input, &output));
EXPECT_EQ(
Status::ErrorIncorrectSizeAesCtrCounter(),
Decrypt(CreateAesCtrAlgorithm(bad_counter, 128), key, input, &output));
}
}
TEST_F(WebCryptoAesCtrTest, InvalidCounterLength) {
blink::WebCryptoKey key = AesCtrKeyFromBytes(std::vector<uint8_t>(16));
std::vector<uint8_t> counter(16);
std::vector<uint8_t> input(32);
std::vector<uint8_t> output;
// The counter length cannot be less than 1 or greater than 128.
for (uint8_t bad_length : {0, 129}) {
EXPECT_EQ(Status::ErrorInvalidAesCtrCounterLength(),
Encrypt(CreateAesCtrAlgorithm(counter, bad_length), key, input,
&output));
EXPECT_EQ(Status::ErrorInvalidAesCtrCounterLength(),
Decrypt(CreateAesCtrAlgorithm(counter, bad_length), key, 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;
blink::WebCryptoKey key = AesCtrKeyFromBytes(std::vector<uint8_t>(16));
std::vector<uint8_t> buffer(272);
// 16 and 17 AES blocks worth of data respectively (AES blocks are 16 bytes
// long).
auto input_16 = base::span(buffer).first<256>();
auto input_17 = base::span(buffer).first<272>();
std::vector<uint8_t> output;
for (uint8_t start : {0, 1, 15}) {
std::vector<uint8_t> counter(16);
counter[15] = start;
// 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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