csu3_am335x/EVSE/GPL/plc-utils.LNX.2.1.20/source/key/SHA256Match.c

/*====================================================================*
 *
 *   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;
 *
 *   Motley Tools by Charles Maier <cmaier@cmassoc.net>;
 *   Copyright (c) 2001-2006 by Charles Maier Associates;
 *   Licensed under the Internet Software Consortium License;
 *
 *--------------------------------------------------------------------*/

#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