crypto_hmac.h

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// Copyright (C) 2011-2017 Internet Systems Consortium, Inc. ("ISC")
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.

#include <util/buffer.h>

#include <boost/noncopyable.hpp>

#include <cryptolink/cryptolink.h>

#ifndef ISC_CRYPTO_HMAC_H
#define ISC_CRYPTO_HMAC_H

namespace isc {
namespace cryptolink {

class HMACImpl;

class HMAC : private boost::noncopyable {
private:
    HMAC(const void* secret, size_t secret_len,
         const HashAlgorithm hash_algorithm);

    friend HMAC* CryptoLink::createHMAC(const void*, size_t,
                                        const HashAlgorithm);

public:
    ~HMAC();

    HashAlgorithm getHashAlgorithm() const;

    size_t getOutputLength() const;

    void update(const void* data, const size_t len);

    void sign(isc::util::OutputBuffer& result, size_t len);

    void sign(void* result, size_t len);

    std::vector<uint8_t> sign(size_t len);

    bool verify(const void* sig, size_t len);

private:
    HMACImpl* impl_;
};

void signHMAC(const void* data,
              const size_t data_len,
              const void* secret,
              size_t secret_len,
              const HashAlgorithm hash_algorithm,
              isc::util::OutputBuffer& result,
              size_t len = 0);

bool verifyHMAC(const void* data,
                const size_t data_len,
                const void* secret,
                size_t secret_len,
                const HashAlgorithm hash_algorithm,
                const void* sig,
                const size_t sig_len);

void deleteHMAC(HMAC* hmac);

} // namespace cryptolink
} // namespace isc

#endif // ISC_CRYPTO_HMAC_H