CryptoAlgorithmAES_CBC.cpp [plain text]
#include "config.h"
#include "CryptoAlgorithmAES_CBC.h"
#if ENABLE(SUBTLE_CRYPTO)
#include "CryptoAlgorithmAesCbcCfbParams.h"
#include "CryptoAlgorithmAesKeyParams.h"
#include "CryptoKeyAES.h"
namespace WebCore {
namespace CryptoAlgorithmAES_CBCInternal {
static const char* const ALG128 = "A128CBC";
static const char* const ALG192 = "A192CBC";
static const char* const ALG256 = "A256CBC";
static const size_t IVSIZE = 16;
}
static inline bool usagesAreInvalidForCryptoAlgorithmAES_CBC(CryptoKeyUsageBitmap usages)
{
return usages & (CryptoKeyUsageSign | CryptoKeyUsageVerify | CryptoKeyUsageDeriveKey | CryptoKeyUsageDeriveBits);
}
Ref<CryptoAlgorithm> CryptoAlgorithmAES_CBC::create()
{
return adoptRef(*new CryptoAlgorithmAES_CBC);
}
CryptoAlgorithmIdentifier CryptoAlgorithmAES_CBC::identifier() const
{
return s_identifier;
}
void CryptoAlgorithmAES_CBC::encrypt(std::unique_ptr<CryptoAlgorithmParameters>&& parameters, Ref<CryptoKey>&& key, Vector<uint8_t>&& plainText, VectorCallback&& callback, ExceptionCallback&& exceptionCallback, ScriptExecutionContext& context, WorkQueue& workQueue)
{
using namespace CryptoAlgorithmAES_CBCInternal;
ASSERT(parameters);
auto& aesParameters = downcast<CryptoAlgorithmAesCbcCfbParams>(*parameters);
if (aesParameters.ivVector().size() != IVSIZE) {
exceptionCallback(OperationError);
return;
}
dispatchOperation(workQueue, context, WTFMove(callback), WTFMove(exceptionCallback),
[parameters = WTFMove(parameters), key = WTFMove(key), plainText = WTFMove(plainText)] {
return platformEncrypt(downcast<CryptoAlgorithmAesCbcCfbParams>(*parameters), downcast<CryptoKeyAES>(key.get()), plainText);
});
}
void CryptoAlgorithmAES_CBC::decrypt(std::unique_ptr<CryptoAlgorithmParameters>&& parameters, Ref<CryptoKey>&& key, Vector<uint8_t>&& cipherText, VectorCallback&& callback, ExceptionCallback&& exceptionCallback, ScriptExecutionContext& context, WorkQueue& workQueue)
{
using namespace CryptoAlgorithmAES_CBCInternal;
ASSERT(parameters);
auto& aesParameters = downcast<CryptoAlgorithmAesCbcCfbParams>(*parameters);
if (aesParameters.ivVector().size() != IVSIZE) {
exceptionCallback(OperationError);
return;
}
dispatchOperation(workQueue, context, WTFMove(callback), WTFMove(exceptionCallback),
[parameters = WTFMove(parameters), key = WTFMove(key), cipherText = WTFMove(cipherText)] {
return platformDecrypt(downcast<CryptoAlgorithmAesCbcCfbParams>(*parameters), downcast<CryptoKeyAES>(key.get()), cipherText);
});
}
void CryptoAlgorithmAES_CBC::generateKey(const CryptoAlgorithmParameters& parameters, bool extractable, CryptoKeyUsageBitmap usages, KeyOrKeyPairCallback&& callback, ExceptionCallback&& exceptionCallback, ScriptExecutionContext&)
{
const auto& aesParameters = downcast<CryptoAlgorithmAesKeyParams>(parameters);
if (usagesAreInvalidForCryptoAlgorithmAES_CBC(usages)) {
exceptionCallback(SyntaxError);
return;
}
auto result = CryptoKeyAES::generate(CryptoAlgorithmIdentifier::AES_CBC, aesParameters.length, extractable, usages);
if (!result) {
exceptionCallback(OperationError);
return;
}
callback(WTFMove(result));
}
void CryptoAlgorithmAES_CBC::importKey(CryptoKeyFormat format, KeyData&& data, const std::unique_ptr<CryptoAlgorithmParameters>&& parameters, bool extractable, CryptoKeyUsageBitmap usages, KeyCallback&& callback, ExceptionCallback&& exceptionCallback)
{
using namespace CryptoAlgorithmAES_CBCInternal;
ASSERT(parameters);
if (usagesAreInvalidForCryptoAlgorithmAES_CBC(usages)) {
exceptionCallback(SyntaxError);
return;
}
RefPtr<CryptoKeyAES> result;
switch (format) {
case CryptoKeyFormat::Raw:
result = CryptoKeyAES::importRaw(parameters->identifier, WTFMove(WTF::get<Vector<uint8_t>>(data)), extractable, usages);
break;
case CryptoKeyFormat::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_CBC::exportKey(CryptoKeyFormat format, Ref<CryptoKey>&& key, KeyDataCallback&& callback, ExceptionCallback&& exceptionCallback)
{
using namespace CryptoAlgorithmAES_CBCInternal;
const auto& aesKey = downcast<CryptoKeyAES>(key.get());
if (aesKey.key().isEmpty()) {
exceptionCallback(OperationError);
return;
}
KeyData result;
switch (format) {
case CryptoKeyFormat::Raw:
result = Vector<uint8_t>(aesKey.key());
break;
case CryptoKeyFormat::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_CBC::getKeyLength(const CryptoAlgorithmParameters& parameters)
{
return CryptoKeyAES::getKeyLength(parameters);
}
}
#endif // ENABLE(SUBTLE_CRYPTO)