CryptoAlgorithmPBKDF2GCrypt.cpp   [plain text]

/*
 * Copyright (C) 2017 Apple Inc. All rights reserved.
 * Copyright (C) 2017 Metrological Group B.V.
 * Copyright (C) 2017 Igalia S.L.
 *
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#include "config.h"
#include "CryptoAlgorithmPBKDF2.h"

#if ENABLE(WEB_CRYPTO)

#include "CryptoAlgorithmPbkdf2Params.h"
#include "CryptoKeyRaw.h"
#include "GCryptUtilities.h"

namespace WebCore {

static Optional<Vector<uint8_t>> gcryptDeriveBits(const Vector<uint8_t>& keyData, const Vector<uint8_t>& saltData, CryptoAlgorithmIdentifier hashIdentifier, size_t iterations, size_t length)
{
    // Determine the hash algorithm that will be used for derivation.
    auto hashAlgorithm = digestAlgorithm(hashIdentifier);
    if (!hashAlgorithm)
        return WTF::nullopt;

    // Length, in bits, is a multiple of 8, as guaranteed by CryptoAlgorithmPBKDF2::deriveBits().
    ASSERT(!(length % 8));

    // Derive bits using PBKDF2, the specified hash algorithm, salt data and iteration count.
    Vector<uint8_t> result(length / 8);
    gcry_error_t error = gcry_kdf_derive(keyData.data(), keyData.size(), GCRY_KDF_PBKDF2, *hashAlgorithm, saltData.data(), saltData.size(), iterations, result.size(), result.data());
    if (error != GPG_ERR_NO_ERROR) {
        PAL::GCrypt::logError(error);
        return WTF::nullopt;
    }

    return result;
}

ExceptionOr<Vector<uint8_t>> CryptoAlgorithmPBKDF2::platformDeriveBits(const CryptoAlgorithmPbkdf2Params& parameters, const CryptoKeyRaw& key, size_t length)
{
    auto output = gcryptDeriveBits(key.key(), parameters.saltVector(), parameters.hashIdentifier, parameters.iterations, length);
    if (!output)
        return Exception { OperationError };
    return WTFMove(*output);
}

} // namespace WebCore

#endif // ENABLE(WEB_CRYPTO)