/* $OpenBSD: sha.h,v 1.22 2023/07/08 07:08:11 jsing Exp $ */
/* Copyright (C) 1995-1998 Eric Young ([email protected])
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young ([email protected]).
 * The implementation was written so as to conform with Netscapes SSL.
 *
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson ([email protected]).
 *
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 *
 * 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 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young ([email protected])"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson ([email protected])"
 *
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``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 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.
 *
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

#include <stddef.h>

#ifndef HEADER_SHA_H
#define HEADER_SHA_H
#if !defined(HAVE_ATTRIBUTE__BOUNDED__) && !defined(__OpenBSD__)
#define __bounded__(x, y, z)
#endif

#include <openssl/opensslconf.h>

#ifdef  __cplusplus
extern "C" {
#endif

#if defined(OPENSSL_NO_SHA) || defined(OPENSSL_NO_SHA1)
#error SHA is disabled.
#endif

/*
 * !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
 * ! SHA_LONG has to be at least 32 bits wide.                    !
 * !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
 */

#define SHA_LONG unsigned int

#define SHA_LBLOCK	16
#define SHA_CBLOCK	(SHA_LBLOCK*4)	/* SHA treats input data as a
					 * contiguous array of 32 bit
					 * wide big-endian values. */
#define SHA_LAST_BLOCK  (SHA_CBLOCK-8)
#define SHA_DIGEST_LENGTH 20

typedef struct SHAstate_st {
	SHA_LONG h0, h1, h2, h3, h4;
	SHA_LONG Nl, Nh;
	SHA_LONG data[SHA_LBLOCK];
	unsigned int num;
} SHA_CTX;

#ifndef OPENSSL_NO_SHA1
int SHA1_Init(SHA_CTX *c);
int SHA1_Update(SHA_CTX *c, const void *data, size_t len)
    __attribute__ ((__bounded__(__buffer__, 2, 3)));
int SHA1_Final(unsigned char *md, SHA_CTX *c);
unsigned char *SHA1(const unsigned char *d, size_t n, unsigned char *md)
    __attribute__ ((__bounded__(__buffer__, 1, 2)));
void SHA1_Transform(SHA_CTX *c, const unsigned char *data);
#endif

#define SHA256_CBLOCK	(SHA_LBLOCK*4)	/* SHA-256 treats input data as a
					 * contiguous array of 32 bit
					 * wide big-endian values. */
#define SHA224_DIGEST_LENGTH	28
#define SHA256_DIGEST_LENGTH	32

typedef struct SHA256state_st {
	SHA_LONG h[8];
	SHA_LONG Nl, Nh;
	SHA_LONG data[SHA_LBLOCK];
	unsigned int num, md_len;
} SHA256_CTX;

#ifndef OPENSSL_NO_SHA256
int SHA224_Init(SHA256_CTX *c);
int SHA224_Update(SHA256_CTX *c, const void *data, size_t len)
    __attribute__ ((__bounded__(__buffer__, 2, 3)));
int SHA224_Final(unsigned char *md, SHA256_CTX *c);
unsigned char *SHA224(const unsigned char *d, size_t n, unsigned char *md)
    __attribute__ ((__bounded__(__buffer__, 1, 2)));
int SHA256_Init(SHA256_CTX *c);
int SHA256_Update(SHA256_CTX *c, const void *data, size_t len)
    __attribute__ ((__bounded__(__buffer__, 2, 3)));
int SHA256_Final(unsigned char *md, SHA256_CTX *c);
unsigned char *SHA256(const unsigned char *d, size_t n, unsigned char *md)
    __attribute__ ((__bounded__(__buffer__, 1, 2)));
void SHA256_Transform(SHA256_CTX *c, const unsigned char *data);
#endif

#define SHA384_DIGEST_LENGTH	48
#define SHA512_DIGEST_LENGTH	64

#ifndef OPENSSL_NO_SHA512
/*
 * Unlike 32-bit digest algorithms, SHA-512 *relies* on SHA_LONG64
 * being exactly 64-bit wide. See Implementation Notes in sha512.c
 * for further details.
 */
#define SHA512_CBLOCK	(SHA_LBLOCK*8)	/* SHA-512 treats input data as a
					 * contiguous array of 64 bit
					 * wide big-endian values. */
#if defined(_LP64)
#define SHA_LONG64 unsigned long
#define U64(C)     C##UL
#else
#define SHA_LONG64 unsigned long long
#define U64(C)     C##ULL
#endif

typedef struct SHA512state_st {
	SHA_LONG64 h[8];
	SHA_LONG64 Nl, Nh;
	union {
		SHA_LONG64	d[SHA_LBLOCK];
		unsigned char	p[SHA512_CBLOCK];
	} u;
	unsigned int num, md_len;
} SHA512_CTX;
#endif

#ifndef OPENSSL_NO_SHA512
int SHA384_Init(SHA512_CTX *c);
int SHA384_Update(SHA512_CTX *c, const void *data, size_t len)
    __attribute__ ((__bounded__(__buffer__, 2, 3)));
int SHA384_Final(unsigned char *md, SHA512_CTX *c);
unsigned char *SHA384(const unsigned char *d, size_t n, unsigned char *md)
    __attribute__ ((__bounded__(__buffer__, 1, 2)));
int SHA512_Init(SHA512_CTX *c);
int SHA512_Update(SHA512_CTX *c, const void *data, size_t len)
    __attribute__ ((__bounded__(__buffer__, 2, 3)));
int SHA512_Final(unsigned char *md, SHA512_CTX *c);
unsigned char *SHA512(const unsigned char *d, size_t n, unsigned char *md)
    __attribute__ ((__bounded__(__buffer__, 1, 2)));
void SHA512_Transform(SHA512_CTX *c, const unsigned char *data);
#endif

#ifdef  __cplusplus
}
#endif

#endif