Merge from origin/emacs-24
[emacs.git] / lib / sha1.h
blobb9074165ddccba63e966fa4704f5f43cecc1aba5
1 /* Declarations of functions and data types used for SHA1 sum
2 library functions.
3 Copyright (C) 2000-2001, 2003, 2005-2006, 2008-2015 Free Software
4 Foundation, Inc.
6 This program is free software; you can redistribute it and/or modify it
7 under the terms of the GNU General Public License as published by the
8 Free Software Foundation; either version 3, or (at your option) any
9 later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, see <http://www.gnu.org/licenses/>. */
19 #ifndef SHA1_H
20 # define SHA1_H 1
22 # include <stdio.h>
23 # include <stdint.h>
25 # if HAVE_OPENSSL_SHA1
26 # include <openssl/sha.h>
27 # endif
29 # ifdef __cplusplus
30 extern "C" {
31 # endif
33 #define SHA1_DIGEST_SIZE 20
35 # if HAVE_OPENSSL_SHA1
36 # define GL_OPENSSL_NAME 1
37 # include "gl_openssl.h"
38 # else
39 /* Structure to save state of computation between the single steps. */
40 struct sha1_ctx
42 uint32_t A;
43 uint32_t B;
44 uint32_t C;
45 uint32_t D;
46 uint32_t E;
48 uint32_t total[2];
49 uint32_t buflen;
50 uint32_t buffer[32];
53 /* Initialize structure containing state of computation. */
54 extern void sha1_init_ctx (struct sha1_ctx *ctx);
56 /* Starting with the result of former calls of this function (or the
57 initialization function update the context for the next LEN bytes
58 starting at BUFFER.
59 It is necessary that LEN is a multiple of 64!!! */
60 extern void sha1_process_block (const void *buffer, size_t len,
61 struct sha1_ctx *ctx);
63 /* Starting with the result of former calls of this function (or the
64 initialization function update the context for the next LEN bytes
65 starting at BUFFER.
66 It is NOT required that LEN is a multiple of 64. */
67 extern void sha1_process_bytes (const void *buffer, size_t len,
68 struct sha1_ctx *ctx);
70 /* Process the remaining bytes in the buffer and put result from CTX
71 in first 20 bytes following RESBUF. The result is always in little
72 endian byte order, so that a byte-wise output yields to the wanted
73 ASCII representation of the message digest. */
74 extern void *sha1_finish_ctx (struct sha1_ctx *ctx, void *resbuf);
77 /* Put result from CTX in first 20 bytes following RESBUF. The result is
78 always in little endian byte order, so that a byte-wise output yields
79 to the wanted ASCII representation of the message digest. */
80 extern void *sha1_read_ctx (const struct sha1_ctx *ctx, void *resbuf);
83 /* Compute SHA1 message digest for LEN bytes beginning at BUFFER. The
84 result is always in little endian byte order, so that a byte-wise
85 output yields to the wanted ASCII representation of the message
86 digest. */
87 extern void *sha1_buffer (const char *buffer, size_t len, void *resblock);
89 # endif
90 /* Compute SHA1 message digest for bytes read from STREAM. The
91 resulting message digest number will be written into the 20 bytes
92 beginning at RESBLOCK. */
93 extern int sha1_stream (FILE *stream, void *resblock);
96 # ifdef __cplusplus
98 # endif
100 #endif