sha2.h

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/*************************************************************

ben-jose

sha2.h

sha2 hash func spec.

--------------------------------------------------------------*/

/*
 *  FIPS-180-2 compliant SHA-256 implementation
 *
 *  Copyright (C) 2006-2007  Christophe Devine
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License, version 2.1 as published by the Free Software Foundation.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 *  MA  02110-1301  USA
 */
/*
 *  The SHA-256 Secure Hash Standard was published by NIST in 2002.
 *
 *  http://csrc.nist.gov/publications/fips/fips180-2/fips180-2.pdf
 */

#ifndef _SHA2_H
#define _SHA2_H

#ifdef __cplusplus
extern "C" {
#endif

#define NUM_BYTES_SHA2 32   /* 256 bits */

typedef struct
{
    unsigned long total[2];     
    unsigned long state[8];     
    unsigned char buffer[64];   
    unsigned char ipad[64];     
    unsigned char opad[64];     
    int is224;                  
}
sha2_context;

void sha2_starts( sha2_context *ctx, int is224 );

void sha2_update( sha2_context *ctx, unsigned char *input, int ilen );

void sha2_finish( sha2_context *ctx, unsigned char *output );

void sha2( unsigned char *input,  int ilen,
           unsigned char *output, int is224 );

/*int sha2_file( char *path, unsigned char *output, int is224 );
 */

void sha2_hmac_starts( sha2_context *ctx,  int is224,
                       unsigned char *key, int keylen );

void sha2_hmac_update( sha2_context *ctx,
                       unsigned char *input, int ilen );

void sha2_hmac_finish( sha2_context *ctx, unsigned char *output );

void sha2_hmac( unsigned char *key,  int keylen,
                unsigned char *input,  int ilen,
                unsigned char *output, int is224 );

int sha2_self_test( int verbose );

#ifdef __cplusplus
}
#endif

#endif /* sha2.h */