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/* Declarations of functions and data types used for SHA1 sum
library functions.
Copyright (C) 2000-2001, 2003, 2005-2006, 2008-2020 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 *restrict 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 *restrict 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 *restrict 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:
*/
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