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/*
* Copyright (C) 2017 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "CryptoAlgorithmAES_CTR.h"
#if ENABLE(SUBTLE_CRYPTO)
#include "CryptoAlgorithmAesCtrParams.h"
#include "CryptoAlgorithmAesKeyParams.h"
#include "CryptoKeyAES.h"
namespace WebCore {
static const char* const ALG128 = "A128CTR";
static const char* const ALG192 = "A192CTR";
static const char* const ALG256 = "A256CTR";
static const size_t CounterSize = 16;
static inline bool usagesAreInvalidForCryptoAlgorithmAES_CTR(CryptoKeyUsageBitmap usages)
{
return usages & (CryptoKeyUsageSign | CryptoKeyUsageVerify | CryptoKeyUsageDeriveKey | CryptoKeyUsageDeriveBits);
}
static bool parametersAreValid(CryptoAlgorithmAesCtrParams& parameters)
{
if (parameters.counterVector().size() != CounterSize)
return false;
if (!parameters.length || parameters.length > 128)
return false;
return true;
}
Ref<CryptoAlgorithm> CryptoAlgorithmAES_CTR::create()
{
return adoptRef(*new CryptoAlgorithmAES_CTR);
}
CryptoAlgorithmIdentifier CryptoAlgorithmAES_CTR::identifier() const
{
return s_identifier;
}
void CryptoAlgorithmAES_CTR::encrypt(std::unique_ptr<CryptoAlgorithmParameters>&& parameters, Ref<CryptoKey>&& key, Vector<uint8_t>&& plainText, VectorCallback&& callback, ExceptionCallback&& exceptionCallback, ScriptExecutionContext& context, WorkQueue& workQueue)
{
ASSERT(parameters);
auto& aesParameters = downcast<CryptoAlgorithmAesCtrParams>(*parameters);
if (!parametersAreValid(aesParameters)) {
exceptionCallback(OperationError);
return;
}
platformEncrypt(WTFMove(parameters), WTFMove(key), WTFMove(plainText), WTFMove(callback), WTFMove(exceptionCallback), context, workQueue);
}
void CryptoAlgorithmAES_CTR::decrypt(std::unique_ptr<CryptoAlgorithmParameters>&& parameters, Ref<CryptoKey>&& key, Vector<uint8_t>&& cipherText, VectorCallback&& callback, ExceptionCallback&& exceptionCallback, ScriptExecutionContext& context, WorkQueue& workQueue)
{
ASSERT(parameters);
auto& aesParameters = downcast<CryptoAlgorithmAesCtrParams>(*parameters);
if (!parametersAreValid(aesParameters)) {
exceptionCallback(OperationError);
return;
}
platformDecrypt(WTFMove(parameters), WTFMove(key), WTFMove(cipherText), WTFMove(callback), WTFMove(exceptionCallback), context, workQueue);
}
void CryptoAlgorithmAES_CTR::generateKey(const CryptoAlgorithmParameters& parameters, bool extractable, CryptoKeyUsageBitmap usages, KeyOrKeyPairCallback&& callback, ExceptionCallback&& exceptionCallback, ScriptExecutionContext&)
{
const auto& aesParameters = downcast<CryptoAlgorithmAesKeyParams>(parameters);
if (usagesAreInvalidForCryptoAlgorithmAES_CTR(usages)) {
exceptionCallback(SyntaxError);
return;
}
auto result = CryptoKeyAES::generate(CryptoAlgorithmIdentifier::AES_CTR, aesParameters.length, extractable, usages);
if (!result) {
exceptionCallback(OperationError);
return;
}
callback(WTFMove(result));
}
void CryptoAlgorithmAES_CTR::importKey(SubtleCrypto::KeyFormat format, KeyData&& data, const std::unique_ptr<CryptoAlgorithmParameters>&& parameters, bool extractable, CryptoKeyUsageBitmap usages, KeyCallback&& callback, ExceptionCallback&& exceptionCallback)
{
ASSERT(parameters);
if (usagesAreInvalidForCryptoAlgorithmAES_CTR(usages)) {
exceptionCallback(SyntaxError);
return;
}
RefPtr<CryptoKeyAES> result;
switch (format) {
case SubtleCrypto::KeyFormat::Raw:
result = CryptoKeyAES::importRaw(parameters->identifier, WTFMove(WTF::get<Vector<uint8_t>>(data)), extractable, usages);
break;
case SubtleCrypto::KeyFormat::Jwk: {
auto checkAlgCallback = [](size_t length, const String& alg) -> bool {
switch (length) {
case CryptoKeyAES::s_length128:
return alg.isNull() || alg == ALG128;
case CryptoKeyAES::s_length192:
return alg.isNull() || alg == ALG192;
case CryptoKeyAES::s_length256:
return alg.isNull() || alg == ALG256;
}
return false;
};
result = CryptoKeyAES::importJwk(parameters->identifier, WTFMove(WTF::get<JsonWebKey>(data)), extractable, usages, WTFMove(checkAlgCallback));
break;
}
default:
exceptionCallback(NotSupportedError);
return;
}
if (!result) {
exceptionCallback(DataError);
return;
}
callback(*result);
}
void CryptoAlgorithmAES_CTR::exportKey(SubtleCrypto::KeyFormat format, Ref<CryptoKey>&& key, KeyDataCallback&& callback, ExceptionCallback&& exceptionCallback)
{
const auto& aesKey = downcast<CryptoKeyAES>(key.get());
if (aesKey.key().isEmpty()) {
exceptionCallback(OperationError);
return;
}
KeyData result;
switch (format) {
case SubtleCrypto::KeyFormat::Raw:
result = Vector<uint8_t>(aesKey.key());
break;
case SubtleCrypto::KeyFormat::Jwk: {
JsonWebKey jwk = aesKey.exportJwk();
switch (aesKey.key().size() * 8) {
case CryptoKeyAES::s_length128:
jwk.alg = String(ALG128);
break;
case CryptoKeyAES::s_length192:
jwk.alg = String(ALG192);
break;
case CryptoKeyAES::s_length256:
jwk.alg = String(ALG256);
break;
default:
ASSERT_NOT_REACHED();
}
result = WTFMove(jwk);
break;
}
default:
exceptionCallback(NotSupportedError);
return;
}
callback(format, WTFMove(result));
}
ExceptionOr<size_t> CryptoAlgorithmAES_CTR::getKeyLength(const CryptoAlgorithmParameters& parameters)
{
return CryptoKeyAES::getKeyLength(parameters);
}
}
#endif // ENABLE(SUBTLE_CRYPTO)
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