/* Declarations of functions and data types used for SHA1 sum

   library functions.

   Copyright (C) 2000-2001, 2003, 2005-2006, 2008-2018 Free Software

   Foundation, Inc.

   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, see <https://www.gnu.org/licenses/>.  */

#ifndef SHA1_H

# define SHA1_H 1

# include <stdio.h>

# include <stdint.h>

# if HAVE_OPENSSL_SHA1

#  include <openssl/sha.h>

# endif

# ifdef __cplusplus

extern "C" {

# endif

#define SHA1_DIGEST_SIZE 20

# if HAVE_OPENSSL_SHA1

#  define GL_OPENSSL_NAME 1

#  include "gl_openssl.h"

# else

/* Structure to save state of computation between the single steps.  */

struct sha1_ctx

{

  uint32_t A;

  uint32_t B;

  uint32_t C;

  uint32_t D;

  uint32_t E;

  uint32_t total[2];

  uint32_t buflen;     /* ≥ 0, ≤ 128 */

  uint32_t buffer[32]; /* 128 bytes; the first buflen bytes are in use */

};

/* Initialize structure containing state of computation. */

extern void sha1_init_ctx (struct sha1_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 64!!! */

extern void sha1_process_block (const void *buffer, size_t len,

                                struct sha1_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 64.  */

extern void sha1_process_bytes (const void *buffer, size_t len,

                                struct sha1_ctx *ctx);

/* Process the remaining bytes in the buffer and put result from CTX

   in first 20 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 *sha1_finish_ctx (struct sha1_ctx *ctx, void *resbuf);

/* Put result from CTX in first 20 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 *sha1_read_ctx (const struct sha1_ctx *ctx, void *resbuf);

/* Compute SHA1 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 *sha1_buffer (const char *buffer, size_t len, void *resblock);

# endif

/* Compute SHA1 message digest for bytes read from STREAM.

   STREAM is an open file stream.  Regular files are handled more efficiently.

   The contents of STREAM from its current position to its end will be read.

   The case that the last operation on STREAM was an 'ungetc' is not supported.

   The resulting message digest number will be written into the 20 bytes

   beginning at RESBLOCK.  */

extern int sha1_stream (FILE *stream, void *resblock);

# ifdef __cplusplus

}

# endif

#endif

/*

 * Hey Emacs!

 * Local Variables:

 * coding: utf-8

 * End:

 */