CryptoAlgorithmAES_CFBMac.cpp [plain text]
#include "config.h"
#include "CryptoAlgorithmAES_CFB.h"
#if ENABLE(SUBTLE_CRYPTO)
#include "CryptoAlgorithmAesCbcCfbParams.h"
#include "CryptoKeyAES.h"
#include <CommonCrypto/CommonCrypto.h>
namespace WebCore {
static ExceptionOr<Vector<uint8_t>> transformAES_CFB(CCOperation operation, const Vector<uint8_t>& iv, const Vector<uint8_t>& key, const Vector<uint8_t>& data)
{
CCCryptorRef cryptor;
CCCryptorStatus status = CCCryptorCreateWithMode(operation, kCCModeCFB8, kCCAlgorithmAES, ccNoPadding, iv.data(), key.data(), key.size(), 0, 0, 0, 0, &cryptor);
if (status)
return Exception { OperationError };
Vector<uint8_t> result(CCCryptorGetOutputLength(cryptor, data.size(), true));
size_t bytesWritten;
status = CCCryptorUpdate(cryptor, data.data(), data.size(), result.data(), result.size(), &bytesWritten);
if (status)
return Exception { OperationError };
uint8_t* p = result.data() + bytesWritten;
status = CCCryptorFinal(cryptor, p, result.end() - p, &bytesWritten);
p += bytesWritten;
if (status)
return Exception { OperationError };
ASSERT(p <= result.end());
result.shrink(p - result.begin());
CCCryptorRelease(cryptor);
return WTFMove(result);
}
ExceptionOr<Vector<uint8_t>> CryptoAlgorithmAES_CFB::platformEncrypt(const CryptoAlgorithmAesCbcCfbParams& parameters, const CryptoKeyAES& key, const Vector<uint8_t>& plainText)
{
ASSERT(parameters.ivVector().size() == kCCBlockSizeAES128);
return transformAES_CFB(kCCEncrypt, parameters.ivVector(), key.key(), plainText);
}
ExceptionOr<Vector<uint8_t>> CryptoAlgorithmAES_CFB::platformDecrypt(const CryptoAlgorithmAesCbcCfbParams& parameters, const CryptoKeyAES& key, const Vector<uint8_t>& cipherText)
{
ASSERT(parameters.ivVector().size() == kCCBlockSizeAES128);
return transformAES_CFB(kCCDecrypt, parameters.ivVector(), key.key(), cipherText);
}
}
#endif // ENABLE(SUBTLE_CRYPTO)