Source/WebCore/crypto/mac/CryptoAlgorithmPBKDF2Mac.cpp

/*
 * Copyright (C) 2017 Apple Inc. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 *
 * 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
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#include "config.h"
#include "CryptoAlgorithmPBKDF2.h"

#if ENABLE(WEB_CRYPTO)

#include "CryptoAlgorithmPbkdf2Params.h"
#include "CryptoKeyRaw.h"
#include <CommonCrypto/CommonKeyDerivation.h>

namespace WebCore {

namespace CryptoAlgorithmPBKDF2MacInternal {
static CCPseudoRandomAlgorithm commonCryptoHMACAlgorithm(CryptoAlgorithmIdentifier hashFunction)
{
    switch (hashFunction) {
    case CryptoAlgorithmIdentifier::SHA_1:
        return kCCPRFHmacAlgSHA1;
    case CryptoAlgorithmIdentifier::SHA_224:
        return kCCPRFHmacAlgSHA224;
    case CryptoAlgorithmIdentifier::SHA_256:
        return kCCPRFHmacAlgSHA256;
    case CryptoAlgorithmIdentifier::SHA_384:
        return kCCPRFHmacAlgSHA384;
    case CryptoAlgorithmIdentifier::SHA_512:
        return kCCPRFHmacAlgSHA512;
    default:
        ASSERT_NOT_REACHED();
        return 0;
    }
}
}

ExceptionOr<Vector<uint8_t>> CryptoAlgorithmPBKDF2::platformDeriveBits(const CryptoAlgorithmPbkdf2Params& parameters, const CryptoKeyRaw& key, size_t length)
{
    Vector<uint8_t> result(length / 8);
    // CCKeyDerivationPBKDF returns an error if the key pointer is null, even if the key length is 0. For this reason, we need to make sure we pass the empty string
    // instead of a null pointer in this case.
    if (CCKeyDerivationPBKDF(kCCPBKDF2, key.key().data() ? reinterpret_cast<const char *>(key.key().data()) : "", key.key().size(), parameters.saltVector().data(), parameters.saltVector().size(), CryptoAlgorithmPBKDF2MacInternal::commonCryptoHMACAlgorithm(parameters.hashIdentifier), parameters.iterations, result.data(), length / 8))
        return Exception { OperationError };
    return WTFMove(result);
}

}

#endif // ENABLE(WEB_CRYPTO)