mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-12-22 10:26:20 +00:00
92 lines
3.5 KiB
C
92 lines
3.5 KiB
C
/* Declarations of functions and data types used for SHA256 and SHA224 sum
|
|
library functions.
|
|
Copyright (C) 2005-2006, 2008-2011 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 of the License, 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 <http://www.gnu.org/licenses/>. */
|
|
|
|
#ifndef SHA256_H
|
|
# define SHA256_H 1
|
|
|
|
# include <stdio.h>
|
|
# include <stdint.h>
|
|
|
|
# ifdef __cplusplus
|
|
extern "C" {
|
|
# endif
|
|
|
|
/* Structure to save state of computation between the single steps. */
|
|
struct sha256_ctx
|
|
{
|
|
uint32_t state[8];
|
|
|
|
uint32_t total[2];
|
|
size_t buflen;
|
|
uint32_t buffer[32];
|
|
};
|
|
|
|
enum { SHA224_DIGEST_SIZE = 224 / 8 };
|
|
enum { SHA256_DIGEST_SIZE = 256 / 8 };
|
|
|
|
/* Initialize structure containing state of computation. */
|
|
extern void sha256_init_ctx (struct sha256_ctx *ctx);
|
|
extern void sha224_init_ctx (struct sha256_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 sha256_process_block (const void *buffer, size_t len,
|
|
struct sha256_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 sha256_process_bytes (const void *buffer, size_t len,
|
|
struct sha256_ctx *ctx);
|
|
|
|
/* Process the remaining bytes in the buffer and put result from CTX
|
|
in first 32 (28) 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 *sha256_finish_ctx (struct sha256_ctx *ctx, void *resbuf);
|
|
extern void *sha224_finish_ctx (struct sha256_ctx *ctx, void *resbuf);
|
|
|
|
|
|
/* Put result from CTX in first 32 (28) 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 *sha256_read_ctx (const struct sha256_ctx *ctx, void *resbuf);
|
|
extern void *sha224_read_ctx (const struct sha256_ctx *ctx, void *resbuf);
|
|
|
|
|
|
/* Compute SHA256 (SHA224) message digest for bytes read from STREAM. The
|
|
resulting message digest number will be written into the 32 (28) bytes
|
|
beginning at RESBLOCK. */
|
|
extern int sha256_stream (FILE *stream, void *resblock);
|
|
extern int sha224_stream (FILE *stream, void *resblock);
|
|
|
|
/* Compute SHA256 (SHA224) 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 *sha256_buffer (const char *buffer, size_t len, void *resblock);
|
|
extern void *sha224_buffer (const char *buffer, size_t len, void *resblock);
|
|
|
|
# ifdef __cplusplus
|
|
}
|
|
# endif
|
|
|
|
#endif
|