sha2.h

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/*
 *
 * FIPS-180-2 compliant SHA-256 implementation
 * Copyright (C) 2010 Paul Bakker.
 * Originally written (2003-2006) by Christophe Devine.
 *
 * This code is free software; you can redistribute it and/or
 * modify it, as a part of the International Chemical Identifier (InChI)
 * software, under the terms of the MIT license
 * https://opensource.org/license/mit
 *
 * Note that this licensing is only valid in combination with the InChI
 * software package, for all other cases contact Paul Bakker.
 */
 
/*
 *  The SHA-256 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
 
    typedef struct
    {
        unsigned long total[2];     
        unsigned long state[8];     
        unsigned char buffer[64];   
    }
    sha2_context;
 
    void sha2_starts( sha2_context *ctx );
 
    void sha2_update( sha2_context *ctx, unsigned char *input, int ilen );
 
    void sha2_finish( sha2_context *ctx, unsigned char output[32] );
 
    void sha2_csum( unsigned char *input, int ilen,
                    unsigned char output[32] );
 
    int sha2_file( char *path, unsigned char output[32] );
 
    void sha2_hmac( unsigned char *key, int keylen,
                    unsigned char *input, int ilen,
                    unsigned char output[32] );
 
    int sha2_self_test( void );
 
#ifdef __cplusplus
}
#endif
 
 
#endif    /* _SHA2_H_ */