/*
  * Copyright (C) 2001 Niels Moller
  *  
  * The nettle library is free software; you can redistribute it and/or modify
  * it under the terms of the GNU Lesser General Public License as published by
  * the Free Software Foundation; either version 2.1 of the License, or (at your
  * option) any later version.
  * 
  * The nettle 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 the nettle library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
  * MA 02111-1307, USA.
  */
  
 #ifndef __SHA256_H
 #define __SHA256_H
 
 #include "cltypes.h"
 
 #define SHA256_DIGEST_SIZE 32
 #define SHA256_DATA_SIZE 64
 
 /* Digest is kept internally as 8 32-bit words. */
 #define _SHA256_DIGEST_LENGTH 8
 
 typedef struct sha256_ctx
 {
   uint32_t state[_SHA256_DIGEST_LENGTH];    /* State variables */
   uint32_t count_low, count_high;           /* 64-bit block count */
   unsigned char block[SHA256_DATA_SIZE];          /* SHA256 data buffer */
   uint32_t index;                       /* index into buffer */
 } SHA256_CTX;
 
 void
 sha256_init(struct sha256_ctx *ctx);
 
 void
 sha256_update(struct sha256_ctx *ctx, const unsigned char *data, uint32_t length);
 
 void
 sha256_final(struct sha256_ctx *ctx);
 
 void
 sha256_digest(const struct sha256_ctx *ctx, unsigned char *digest);
 
 #endif