/*
 * Written by Aaron D. Gifford <me@aarongifford.com>
 *
 * Copyright 2000 Aaron D. Gifford.  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 copyright holder nor the names of contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) AND CONTRIBUTOR(S) ``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 AUTHOR(S) OR CONTRIBUTOR(S) 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 _SHA2_DIGEST_H_
#define _SHA2_DIGEST_H_

typedef uint8_t  sha2_byte;    /* Exactly 1 byte */
typedef uint32_t sha2_word32;  /* Exactly 4 bytes */
typedef uint64_t sha2_word64;  /* Exactly 8 bytes */

/*** SHA-256 Various Length Definitions ***********************/
#define SHA256_BLOCK_LENGTH		64
#define SHA256_DIGEST_LENGTH		32
#define SHA256_DIGEST_STRING_LENGTH	(SHA256_DIGEST_LENGTH * 2 + 1)

/*** SHA-256 Context Structures *******************************/
typedef struct _SHA256_CTX {
	uint32_t	state[8];
	uint64_t	bitcount;
	uint8_t		buffer[SHA256_BLOCK_LENGTH];
} SHA256_CTX;

void	SHA256_Init(SHA256_CTX *);
void	SHA256_Update(SHA256_CTX*, const uint8_t*, size_t);
char	*SHA256_End(SHA256_CTX*, uint8_t[SHA256_DIGEST_STRING_LENGTH]);

#endif /* !_SHA2_DIGEST_H_ */