/*****************************************************************************
 * Declaration of functions and data types used for SHA512 and SHA384        *
 * sum computing.                                                            *
 *                                                                           *
 * Copyright (C) 2005, 2006, 2008                                            *
 *     by Free Software Foundation, Inc.                                     *
 *                                                                           *
 * This file was taken from coreutils-7.4 and adapted for digup.             *
 *                                                                           *
 * This program is free software; you can redistribute it and/or modify it   *
 * under the terms of the GNU General Public License as published by the     *
 * Free Software Foundation; either version 3, or (at your option) any       *
 * later version.                                                            *
 *                                                                           *
 * This program 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 General Public License for more details.                              *
 *                                                                           *
 * You should have received a copy of the GNU General Public License         *
 * along with this program; if not, write to the Free Software Foundation,   *
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.        *
 *****************************************************************************/

#ifndef _SHA512_H
#define _SHA512_H 1

#include <inttypes.h>
#include <stdlib.h>

/* Structure to save state of computation between the single steps.  */
struct sha512_ctx
{
  uint64_t state[8];

  uint64_t total[2];
  size_t   buflen;
  uint64_t buffer[32];
};

enum { SHA384_DIGEST_SIZE = 384 / 8 };
enum { SHA512_DIGEST_SIZE = 512 / 8 };

/* Initialize structure containing state of computation. */
extern void sha512_init_ctx (struct sha512_ctx *ctx);
extern void sha384_init_ctx (struct sha512_ctx *ctx);

/* Starting with the result of former calls of this function (or the
   initialization function update the context for the next LEN bytes
   starting at BUFFER.
   It is necessary that LEN is a multiple of 128!!! */
extern void sha512_process_block (const void *buffer, size_t len,
				  struct sha512_ctx *ctx);

/* Starting with the result of former calls of this function (or the
   initialization function update the context for the next LEN bytes
   starting at BUFFER.
   It is NOT required that LEN is a multiple of 128.  */
extern void sha512_process_bytes (const void *buffer, size_t len,
				  struct sha512_ctx *ctx);

/* Process the remaining bytes in the buffer and put result from CTX
   in first 64 (48) bytes following RESBUF.  The result is always in
   little endian byte order, so that a byte-wise output yields to the
   wanted ASCII representation of the message digest.  */
extern void *sha512_finish_ctx (struct sha512_ctx *ctx, void *resbuf);
extern void *sha384_finish_ctx (struct sha512_ctx *ctx, void *resbuf);

/* Put result from CTX in first 64 (48) bytes following RESBUF.  The
   result is always in little endian byte order, so that a byte-wise
   output yields to the wanted ASCII representation of the message
   digest.

   IMPORTANT: On some systems it is required that RESBUF is correctly
   aligned for a 32 bits value.  */
extern void *sha512_read_ctx (const struct sha512_ctx *ctx, void *resbuf);
extern void *sha384_read_ctx (const struct sha512_ctx *ctx, void *resbuf);

/* Compute SHA512 (SHA384) message digest for LEN bytes beginning at
   BUFFER.  The result is always in little endian byte order, so that
   a byte-wise output yields to the wanted ASCII representation of the
   message digest.  */
extern void *sha512_buffer (const char *buffer, size_t len, void *resblock);
extern void *sha384_buffer (const char *buffer, size_t len, void *resblock);

#endif /* _SHA512_H */

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