CryptoAlgorithmHKDFMac.cpp   [plain text]

/*
 * Copyright (C) 2017 Apple Inc. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
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#include "config.h"
#include "CryptoAlgorithmHKDF.h"

#if ENABLE(SUBTLE_CRYPTO)

#include "CommonCryptoUtilities.h"
#include "CryptoAlgorithmHkdfParams.h"
#include "CryptoKeyRaw.h"
#include "ExceptionCode.h"
#include "ScriptExecutionContext.h"

namespace WebCore {

void CryptoAlgorithmHKDF::platformDeriveBits(std::unique_ptr<CryptoAlgorithmParameters>&& parameters, Ref<CryptoKey>&& baseKey, size_t length, VectorCallback&& callback, ExceptionCallback&& exceptionCallback, ScriptExecutionContext& context, WorkQueue& workQueue)
{
    context.ref();
    workQueue.dispatch([parameters = WTFMove(parameters), baseKey = WTFMove(baseKey), length, callback = WTFMove(callback), exceptionCallback = WTFMove(exceptionCallback), &context]() mutable {
        auto& hkdfParameters = downcast<CryptoAlgorithmHkdfParams>(*parameters);
        auto& rawKey = downcast<CryptoKeyRaw>(baseKey.get());

        Vector<uint8_t> result(length / 8);
        CCDigestAlgorithm digestAlgorithm;
        getCommonCryptoDigestAlgorithm(hkdfParameters.hashIdentifier, digestAlgorithm);
        // <rdar://problem/32439455> Currently, when rawKey is null, CCKeyDerivationHMac will bail out.
        if (CCKeyDerivationHMac(kCCKDFAlgorithmHKDF, digestAlgorithm, 0, rawKey.key().data(), rawKey.key().size(), 0, 0, hkdfParameters.infoVector().data(), hkdfParameters.infoVector().size(), 0, 0, hkdfParameters.saltVector().data(), hkdfParameters.saltVector().size(), result.data(), result.size())) {
            // We should only dereference callbacks after being back to the Document/Worker threads.
            context.postTask([exceptionCallback = WTFMove(exceptionCallback), callback = WTFMove(callback)](ScriptExecutionContext& context) {
                exceptionCallback(OperationError);
                context.deref();
            });
            return;
        }
        // We should only dereference callbacks after being back to the Document/Worker threads.
        context.postTask([callback = WTFMove(callback), result = WTFMove(result), exceptionCallback = WTFMove(exceptionCallback)](ScriptExecutionContext& context) {
            callback(result);
            context.deref();
        });
    });
}

}

#endif // ENABLE(SUBTLE_CRYPTO)