SHA256Match.c
Author: cmaier@cmassoc.net

    /*====================================================================*
     *
     *   Copyright (c) 2013 Qualcomm Atheros, Inc.
     *
     *   All rights reserved.
     *
     *   Redistribution and use in source and binary forms, with or
     *   without modification, are permitted (subject to the limitations
     *   in the disclaimer below) provided that the following conditions
     *   are met:
     *
     *   * Redistributions of source code must retain the above copyright
     *     notice, this list of conditions and the following disclaimer.
     *
     *   * 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.
     *
     *   * Neither the name of Qualcomm Atheros nor the names of
     *     its contributors may be used to endorse or promote products
     *     derived from this software without specific prior written
     *     permission.
     *
     *   NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE
     *   GRANTED BY THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE
     *   COPYRIGHT HOLDERS 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 COPYRIGHT OWNER
     *   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.
     *
     *--------------------------------------------------------------------*/

    /*====================================================================*
     *
     *   signed SHA256Match (signed fd, const uint8_t digest[]);
     *
     *   SHA256.h
     *
     *   search a fingerprint file for the given digest; return true
     *   on success and false on failure; digests in the fingerprint
     *   file must be upper case because comparison is binary;
     *
     *
     *--------------------------------------------------------------------*/

    #ifndef SHA256MATCH_SOURCE
    #define SHA256MATCH_SOURCE

    #include <unistd.h>
    #include <errno.h>

    #include "../tools/number.h"
    #include "../key/SHA256.h"

    signed SHA256Match (signed fd, const uint8_t digest [])

    {
    	char string [SHA256_DIGEST_LENGTH << 1];
    	char buffer [SHA256_DIGEST_LENGTH << 1];
    	signed length = 0;
    	while (length < (signed)(sizeof (string)))
    	{
    		string [length++] = DIGITS_HEX [(*digest >> 4) & 0x0F];
    		string [length++] = DIGITS_HEX [(*digest >> 0) & 0x0F];
    		digest++;
    	}
    	while (read (fd, buffer, sizeof (buffer)) == sizeof (buffer))
    	{
    		char c;
    		if (!memcmp (string, buffer, sizeof (string)))
    		{
    			return (1);
    		}
    		while (read (fd, &c, sizeof (c)) == sizeof (c))
    		{
    			if (c == '\n')
    			{
    				break;
    			}
    		}
    	}
    	return (0);
    }

    #endif

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