/*
 * FILE:    sha2.h
 * AUTHOR:  Aaron D. Gifford
 *          http://www.aarongifford.com/computers/sha.html
 *
 * Copyright (c) 2000-2003, 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.
 *
 * $Id: sha2.h,v 1.4 2004/01/07 19:06:18 adg Exp $
 */

#ifndef __SHA2_H__
#define __SHA2_H__

/*[SK] refer to the Gauche's config */
#include <gauche/config.h>
#include "renaming.h"

#include <stdint.h>
#include <inttypes.h>
#define SHA2_USE_INTTYPES_H

/* gauche/config.h provides WORDS_BIGENDIAN. */
#undef BYTE_ORDER
#ifndef LITTLE_ENDIAN
#define LITTLE_ENDIAN 1234
#endif
#ifndef BIG_ENDIAN
#define BIG_ENDIAN 4321
#endif
#if WORDS_BIGENDIAN
#define BYTE_ORDER BIG_ENDIAN
#else
#define BYTE_ORDER LITTLE_ENDIAN
#endif
/*[/SK]*/

#ifdef __cplusplus
extern "C" {
#endif


/*
 * Import u_intXX_t size_t type definitions from system headers.  You
 * may need to change this, or define these things yourself in this
 * file.
 */
#include <sys/types.h>

#ifdef SHA2_USE_INTTYPES_H

#include <inttypes.h>

#endif /* SHA2_USE_INTTYPES_H */


/*** SHA-224/256/384/512 Various Length Definitions *******************/

/* Digest lengths for SHA-1/224/256/384/512 */
#define   SHA1_DIGEST_LENGTH          20
#define   SHA1_DIGEST_STRING_LENGTH  (SHA1_DIGEST_LENGTH   * 2 + 1)
#define SHA224_DIGEST_LENGTH          28
#define SHA224_DIGEST_STRING_LENGTH  (SHA224_DIGEST_LENGTH * 2 + 1)
#define SHA256_DIGEST_LENGTH          32
#define SHA256_DIGEST_STRING_LENGTH  (SHA256_DIGEST_LENGTH * 2 + 1)
#define SHA384_DIGEST_LENGTH          48
#define SHA384_DIGEST_STRING_LENGTH  (SHA384_DIGEST_LENGTH * 2 + 1)
#define SHA512_DIGEST_LENGTH          64
#define SHA512_DIGEST_STRING_LENGTH  (SHA512_DIGEST_LENGTH * 2 + 1)


/*** SHA-224/256/384/512 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
/*
 * Most BSD systems already define u_intXX_t types, as does Linux.
 * Some systems, however, like Compaq's Tru64 Unix instead can use
 * uintXX_t types defined by very recent ANSI C standards and included
 * in the file:
 *
 *   #include <inttypes.h>
 *
 * If you choose to use <inttypes.h> then please define:
 *
 *   #define SHA2_USE_INTTYPES_H
 *
 * Or on the command line during compile:
 *
 *   cc -DSHA2_USE_INTTYPES_H ...
 */
#ifdef SHA2_USE_INTTYPES_H

typedef union _SHA_CTX {
    /* SHA-1 uses this part of the union: */
    struct {
        uint32_t state[5];
        uint64_t bitcount;
        uint8_t  buffer[64];
    } s1;

    /* SHA-224 and SHA-256 use this part of the union: */
    struct {
        uint32_t state[8];
        uint64_t bitcount;
        uint8_t  buffer[64];
    } s256;

    /* SHA-384 and SHA-512 use this part of the union: */
    struct {
        uint64_t state[8];
        uint64_t bitcount[2];
        uint8_t  buffer[128];
    } s512;
} SHA_CTX;

#else /* SHA2_USE_INTTYPES_H */

typedef union _SHA_CTX {
    /* SHA-1 uses this part of the union: */
    struct {
        u_int32_t state[5];
        u_int64_t bitcount;
        u_int8_t  buffer[64];
    } s1;

    /* SHA-224 and SHA-256 use this part of the union: */
    struct {
        u_int32_t state[8];
        u_int64_t bitcount;
        u_int8_t  buffer[64];
    } s256;

    /* SHA-384 and SHA-512 use this part of the union: */
    struct {
        u_int64_t state[8];
        u_int64_t bitcount[2];
        u_int8_t  buffer[128];
    } s512;
} SHA_CTX;

#endif /* SHA2_USE_INTTYPES_H */


/*** SHA-256/384/512 Function Prototypes ******************************/
#ifndef NOPROTO
#ifdef SHA2_USE_INTTYPES_H

void SHA1_Init(SHA_CTX*);
void SHA1_Update(SHA_CTX*, const uint8_t*, size_t);
void SHA1_Final(uint8_t[SHA1_DIGEST_LENGTH], SHA_CTX*);
char* SHA1_End(SHA_CTX*, char[SHA1_DIGEST_STRING_LENGTH]);
char* SHA1_Data(const uint8_t*, size_t, char[SHA1_DIGEST_STRING_LENGTH]);

void SHA224_Init(SHA_CTX*);
void SHA224_Update(SHA_CTX*, const uint8_t*, size_t);
void SHA224_Final(uint8_t[SHA224_DIGEST_LENGTH], SHA_CTX*);
char* SHA224_End(SHA_CTX*, char[SHA224_DIGEST_STRING_LENGTH]);
char* SHA224_Data(const uint8_t*, size_t, char[SHA224_DIGEST_STRING_LENGTH]);

void SHA256_Init(SHA_CTX*);
void SHA256_Update(SHA_CTX*, const uint8_t*, size_t);
void SHA256_Final(uint8_t[SHA256_DIGEST_LENGTH], SHA_CTX*);
char* SHA256_End(SHA_CTX*, char[SHA256_DIGEST_STRING_LENGTH]);
char* SHA256_Data(const uint8_t*, size_t, char[SHA256_DIGEST_STRING_LENGTH]);

void SHA384_Init(SHA_CTX*);
void SHA384_Update(SHA_CTX*, const uint8_t*, size_t);
void SHA384_Final(uint8_t[SHA384_DIGEST_LENGTH], SHA_CTX*);
char* SHA384_End(SHA_CTX*, char[SHA384_DIGEST_STRING_LENGTH]);
char* SHA384_Data(const uint8_t*, size_t, char[SHA384_DIGEST_STRING_LENGTH]);

void SHA512_Init(SHA_CTX*);
void SHA512_Update(SHA_CTX*, const uint8_t*, size_t);
void SHA512_Final(uint8_t[SHA512_DIGEST_LENGTH], SHA_CTX*);
char* SHA512_End(SHA_CTX*, char[SHA512_DIGEST_STRING_LENGTH]);
char* SHA512_Data(const uint8_t*, size_t, char[SHA512_DIGEST_STRING_LENGTH]);

#else /* SHA2_USE_INTTYPES_H */

void SHA1_Init(SHA_CTX*);
void SHA1_Update(SHA_CTX*, const u_int8_t*, size_t);
void SHA1_Final(u_int8_t[SHA1_DIGEST_LENGTH], SHA_CTX*);
char* SHA1_End(SHA_CTX*, char[SHA1_DIGEST_STRING_LENGTH]);
char* SHA1_Data(const u_int8_t*, size_t, char[SHA1_DIGEST_STRING_LENGTH]);

void SHA224_Init(SHA_CTX*);
void SHA224_Update(SHA_CTX*, const u_int8_t*, size_t);
void SHA224_Final(u_int8_t[SHA224_DIGEST_LENGTH], SHA_CTX*);
char* SHA224_End(SHA_CTX*, char[SHA224_DIGEST_STRING_LENGTH]);
char* SHA224_Data(const u_int8_t*, size_t, char[SHA224_DIGEST_STRING_LENGTH]);

void SHA256_Init(SHA_CTX*);
void SHA256_Update(SHA_CTX*, const u_int8_t*, size_t);
void SHA256_Final(u_int8_t[SHA256_DIGEST_LENGTH], SHA_CTX*);
char* SHA256_End(SHA_CTX*, char[SHA256_DIGEST_STRING_LENGTH]);
char* SHA256_Data(const u_int8_t*, size_t, char[SHA256_DIGEST_STRING_LENGTH]);

void SHA384_Init(SHA_CTX*);
void SHA384_Update(SHA_CTX*, const u_int8_t*, size_t);
void SHA384_Final(u_int8_t[SHA384_DIGEST_LENGTH], SHA_CTX*);
char* SHA384_End(SHA_CTX*, char[SHA384_DIGEST_STRING_LENGTH]);
char* SHA384_Data(const u_int8_t*, size_t, char[SHA384_DIGEST_STRING_LENGTH]);

void SHA512_Init(SHA_CTX*);
void SHA512_Update(SHA_CTX*, const u_int8_t*, size_t);
void SHA512_Final(u_int8_t[SHA512_DIGEST_LENGTH], SHA_CTX*);
char* SHA512_End(SHA_CTX*, char[SHA512_DIGEST_STRING_LENGTH]);
char* SHA512_Data(const u_int8_t*, size_t, char[SHA512_DIGEST_STRING_LENGTH]);

#endif /* SHA2_USE_INTTYPES_H */

#else /* NOPROTO */

void SHA1_Init();
void SHA1_Update();
void SHA1_Final();
char* SHA1_End();
char* SHA1_Data();

void SHA224_Init();
void SHA224_Update();
void SHA224_Final();
char* SHA224_End();
char* SHA224_Data();

void SHA256_Init();
void SHA256_Update();
void SHA256_Final();
char* SHA256_End();
char* SHA256_Data();

void SHA384_Init();
void SHA384_Update();
void SHA384_Final();
char* SHA384_End();
char* SHA384_Data();

void SHA512_Init();
void SHA512_Update();
void SHA512_Final();
char* SHA512_End();
char* SHA512_Data();

#endif /* NOPROTO */

#ifdef    __cplusplus
}
#endif /* __cplusplus */

#endif /* __SHA2_H__ */
