CryptoAlgorithmAES_KW.cpp [plain text]
#include "config.h"
#include "CryptoAlgorithmAES_KW.h"
#if ENABLE(SUBTLE_CRYPTO)
#include "CryptoAlgorithmAesKeyParams.h"
#include "CryptoKeyAES.h"
#include <wtf/Variant.h>
namespace WebCore {
namespace CryptoAlgorithmAES_KWInternal {
static const char* const ALG128 = "A128KW";
static const char* const ALG192 = "A192KW";
static const char* const ALG256 = "A256KW";
}
static inline bool usagesAreInvalidForCryptoAlgorithmAES_KW(CryptoKeyUsageBitmap usages)
{
return usages & (CryptoKeyUsageSign | CryptoKeyUsageVerify | CryptoKeyUsageDeriveKey | CryptoKeyUsageDeriveBits | CryptoKeyUsageEncrypt | CryptoKeyUsageDecrypt);
}
Ref<CryptoAlgorithm> CryptoAlgorithmAES_KW::create()
{
return adoptRef(*new CryptoAlgorithmAES_KW);
}
CryptoAlgorithmIdentifier CryptoAlgorithmAES_KW::identifier() const
{
return s_identifier;
}
void CryptoAlgorithmAES_KW::generateKey(const CryptoAlgorithmParameters& parameters, bool extractable, CryptoKeyUsageBitmap usages, KeyOrKeyPairCallback&& callback, ExceptionCallback&& exceptionCallback, ScriptExecutionContext&)
{
if (usagesAreInvalidForCryptoAlgorithmAES_KW(usages)) {
exceptionCallback(SyntaxError);
return;
}
auto result = CryptoKeyAES::generate(CryptoAlgorithmIdentifier::AES_KW, downcast<CryptoAlgorithmAesKeyParams>(parameters).length, extractable, usages);
if (!result) {
exceptionCallback(OperationError);
return;
}
callback(WTFMove(result));
}
void CryptoAlgorithmAES_KW::importKey(CryptoKeyFormat format, KeyData&& data, const std::unique_ptr<CryptoAlgorithmParameters>&& parameters, bool extractable, CryptoKeyUsageBitmap usages, KeyCallback&& callback, ExceptionCallback&& exceptionCallback)
{
using namespace CryptoAlgorithmAES_KWInternal;
ASSERT(parameters);
if (usagesAreInvalidForCryptoAlgorithmAES_KW(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: {
result = CryptoKeyAES::importJwk(parameters->identifier, WTFMove(WTF::get<JsonWebKey>(data)), extractable, usages, [](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;
});
break;
}
default:
exceptionCallback(NotSupportedError);
return;
}
if (!result) {
exceptionCallback(DataError);
return;
}
callback(*result);
}
void CryptoAlgorithmAES_KW::exportKey(CryptoKeyFormat format, Ref<CryptoKey>&& key, KeyDataCallback&& callback, ExceptionCallback&& exceptionCallback)
{
using namespace CryptoAlgorithmAES_KWInternal;
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));
}
void CryptoAlgorithmAES_KW::wrapKey(Ref<CryptoKey>&& key, Vector<uint8_t>&& data, VectorCallback&& callback, ExceptionCallback&& exceptionCallback)
{
if (data.size() % 8) {
exceptionCallback(OperationError);
return;
}
auto result = platformWrapKey(downcast<CryptoKeyAES>(key.get()), WTFMove(data));
if (result.hasException()) {
exceptionCallback(result.releaseException().code());
return;
}
callback(result.releaseReturnValue());
}
void CryptoAlgorithmAES_KW::unwrapKey(Ref<CryptoKey>&& key, Vector<uint8_t>&& data, VectorCallback&& callback, ExceptionCallback&& exceptionCallback)
{
auto result = platformUnwrapKey(downcast<CryptoKeyAES>(key.get()), WTFMove(data));
if (result.hasException()) {
exceptionCallback(result.releaseException().code());
return;
}
callback(result.releaseReturnValue());
}
ExceptionOr<size_t> CryptoAlgorithmAES_KW::getKeyLength(const CryptoAlgorithmParameters& parameters)
{
return CryptoKeyAES::getKeyLength(parameters);
}
}
#endif // ENABLE(SUBTLE_CRYPTO)