/*
 * FILE:	sha256.h
 * AUTHOR:	Aaron D. Gifford - http://www.aarongifford.com/
 *
 * Copyright (c) 2000-2001, 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 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 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_H__
#define __SHA2_H__

#ifdef __cplusplus
extern "C"
{
#endif

#include <sys/types.h>
#include <stdint.h>

/*** SHA-256/384/512 Various Length Definitions ***********************/
#define SHA256_BLOCK_LENGTH 64
#define SHA256_DIGEST_LENGTH 32
#define SHA256_DIGEST_STRING_LENGTH (SHA256_DIGEST_LENGTH * 2 + 1)
#define SHA384_BLOCK_LENGTH 128
#define SHA384_DIGEST_LENGTH 48
#define SHA384_DIGEST_STRING_LENGTH (SHA384_DIGEST_LENGTH * 2 + 1)
#define SHA512_BLOCK_LENGTH 128
#define SHA512_DIGEST_LENGTH 64
#define SHA512_DIGEST_STRING_LENGTH (SHA512_DIGEST_LENGTH * 2 + 1)


/*** SHA-256/384/512 Context Structures *******************************/
/* NOTE: If your architecture does not define either u_intXX_t types or
 * uintXX_t (from inttypes.h), you may need to define things by hand
 * for your system:
 */
#if 0
typedef unsigned char u_int8_t;		/* 1-byte  (8-bits)  */
typedef unsigned int u_int32_t;		/* 4-bytes (32-bits) */
typedef unsigned long long u_int64_t;	/* 8-bytes (64-bits) */
#endif

	typedef struct _SHA256_CTX
	{
		uint32_t state[8];
		uint64_t bitcount;
		uint8_t buffer[SHA256_BLOCK_LENGTH];
	} SHA256_CTX;
	typedef struct _SHA512_CTX
	{
		uint64_t state[8];
		uint64_t bitcount[2];
		uint8_t buffer[SHA512_BLOCK_LENGTH];
	} SHA512_CTX;

	typedef SHA512_CTX SHA384_CTX;

	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-256/384/512 Function Prototypes ******************************/
#ifndef NOPROTO

	void sr_SHA256_Init(SHA256_CTX *);
	void sr_SHA256_Update(SHA256_CTX *, const uint8_t *, size_t);
	void sr_SHA256_Final(sha2_byte[SHA256_DIGEST_LENGTH], SHA256_CTX *);
	char *sr_SHA256_End(SHA256_CTX *, char[SHA256_DIGEST_STRING_LENGTH]);
	char *sr_SHA256_Data(
			const uint8_t *, size_t, char[SHA256_DIGEST_STRING_LENGTH]);

	void sr_SHA384_Init(SHA384_CTX *);
	void sr_SHA384_Update(SHA384_CTX *, const uint8_t *, size_t);
	void sr_SHA384_Final(sha2_byte[SHA384_DIGEST_LENGTH], SHA384_CTX *);
	char *sr_SHA384_End(SHA384_CTX *, char[SHA384_DIGEST_STRING_LENGTH]);
	char *sr_SHA384_Data(
			const uint8_t *, size_t, char[SHA384_DIGEST_STRING_LENGTH]);

	void sr_SHA512_Init(SHA512_CTX *);
	void sr_SHA512_Update(SHA512_CTX *, const uint8_t *, size_t);
	void sr_SHA512_Final(sha2_byte[SHA512_DIGEST_LENGTH], SHA512_CTX *);
	char *sr_SHA512_End(SHA512_CTX *, char[SHA512_DIGEST_STRING_LENGTH]);
	char *sr_SHA512_Data(
			const uint8_t *, size_t, char[SHA512_DIGEST_STRING_LENGTH]);

#else /* NOPROTO */

void sr_SHA256_Init();
void sr_SHA256_Update();
void sr_SHA256_Final();
char *sr_SHA256_End();
char *sr_SHA256_Data();

void sr_SHA384_Init();
void sr_SHA384_Update();
void sr_SHA384_Final();
char *sr_SHA384_End();
char *sr_SHA384_Data();

void sr_SHA512_Init();
void sr_SHA512_Update();
void sr_SHA512_Final();
char *sr_SHA512_End();
char *sr_SHA512_Data();

#endif /* NOPROTO */

#ifdef __cplusplus
}
#endif /* __cplusplus */

#endif /* __SHA2_H__ */
