sha256.hpp

/*
 * Updated to C++, zedwood.com 2012
 * Based on Olivier Gay's version
 * See Modified BSD License below:
 *
 * FIPS 180-2 SHA-224/256/384/512 implementation
 * Issue date:  04/30/2005
 * http://www.ouah.org/ogay/sha2/
 *
 * Copyright (C) 2005, 2007 Olivier Gay <olivier.gay@a3.epfl.ch>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the project nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND 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 THE PROJECT OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef SHA256_HPP
#define SHA256_HPP

class SHA256
{
    public:
        void init();
        void update(const unsigned char *message, size_t len);
        void final(unsigned char *digest);
        static const size_t DIGEST_SIZE = ( 256 / 8);

    protected:
        void transform(const unsigned char *message, uint32_t block_nb);

        const static uint32_t sha256_k[];
        static const uint32_t SHA224_256_BLOCK_SIZE = (512/8);
        size_t m_tot_len;
        size_t m_len;
        unsigned char m_block[2*SHA224_256_BLOCK_SIZE];
        uint32_t m_h[8];
};


#endif // SHA256_HPP