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1/* Declarations of functions and data types used for SHA1 sum
2 library functions.
3 Copyright (C) 2000-2001, 2003, 2005-2006, 2008-2023 Free Software
4 Foundation, Inc.
5
6 This file is free software: you can redistribute it and/or modify
7 it under the terms of the GNU Lesser General Public License as
8 published by the Free Software Foundation; either version 2.1 of the
9 License, or (at your option) any later version.
10
11 This file 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 Lesser General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public License
17 along with this program. If not, see <https://www.gnu.org/licenses/>. */
18
19#ifndef SHA1_H
20# define SHA1_H 1
21
22# include <stdio.h>
23# include <stdint.h>
24
25# if HAVE_OPENSSL_SHA1
26# ifndef OPENSSL_API_COMPAT
27# define OPENSSL_API_COMPAT 0x10101000L /* FIXME: Use OpenSSL 1.1+ API. */
28# endif
29# include <openssl/sha.h>
30# endif
31
32# ifdef __cplusplus
33extern "C" {
34# endif
35
36# define SHA1_DIGEST_SIZE 20
37
38# if HAVE_OPENSSL_SHA1
39# define GL_OPENSSL_NAME 1
40# include "gl_openssl.h"
41# else
42/* Structure to save state of computation between the single steps. */
43struct sha1_ctx
44{
45 uint32_t A;
46 uint32_t B;
47 uint32_t C;
48 uint32_t D;
49 uint32_t E;
50
51 uint32_t total[2];
52 uint32_t buflen; /* ≥ 0, ≤ 128 */
53 uint32_t buffer[32]; /* 128 bytes; the first buflen bytes are in use */
54};
55
56/* Initialize structure containing state of computation. */
57extern void sha1_init_ctx (struct sha1_ctx *ctx);
58
59/* Starting with the result of former calls of this function (or the
60 initialization function update the context for the next LEN bytes
61 starting at BUFFER.
62 It is necessary that LEN is a multiple of 64!!! */
63extern void sha1_process_block (const void *buffer, size_t len,
64 struct sha1_ctx *ctx);
65
66/* Starting with the result of former calls of this function (or the
67 initialization function update the context for the next LEN bytes
68 starting at BUFFER.
69 It is NOT required that LEN is a multiple of 64. */
70extern void sha1_process_bytes (const void *buffer, size_t len,
71 struct sha1_ctx *ctx);
72
73/* Process the remaining bytes in the buffer and put result from CTX
74 in first 20 bytes following RESBUF. The result is always in little
75 endian byte order, so that a byte-wise output yields to the wanted
76 ASCII representation of the message digest. */
77extern void *sha1_finish_ctx (struct sha1_ctx *ctx, void *restrict resbuf);
78
79
80/* Put result from CTX in first 20 bytes following RESBUF. The result is
81 always in little endian byte order, so that a byte-wise output yields
82 to the wanted ASCII representation of the message digest. */
83extern void *sha1_read_ctx (const struct sha1_ctx *ctx, void *restrict resbuf);
84
85
86/* Compute SHA1 message digest for LEN bytes beginning at BUFFER. The
87 result is always in little endian byte order, so that a byte-wise
88 output yields to the wanted ASCII representation of the message
89 digest. */
90extern void *sha1_buffer (const char *buffer, size_t len,
91 void *restrict resblock);
92
93# endif
94
95/* Compute SHA1 message digest for bytes read from STREAM.
96 STREAM is an open file stream. Regular files are handled more efficiently.
97 The contents of STREAM from its current position to its end will be read.
98 The case that the last operation on STREAM was an 'ungetc' is not supported.
99 The resulting message digest number will be written into the 20 bytes
100 beginning at RESBLOCK. */
101extern int sha1_stream (FILE *stream, void *resblock);
102
103
104# ifdef __cplusplus
105}
106# endif
107
108#endif
109
110/*
111 * Hey Emacs!
112 * Local Variables:
113 * coding: utf-8
114 * End:
115 */