1 /* Declaration of functions and data types used for MD5 sum computing
2 library functions.
3 Copyright (C) 1995-1997, 1999-2001, 2004-2006, 2008-2023 Free Software
4 Foundation, Inc.
5 This file is part of the GNU C Library.
6
7 This file is free software: you can redistribute it and/or modify
8 it under the terms of the GNU Lesser General Public License as
9 published by the Free Software Foundation; either version 2.1 of the
10 License, or (at your option) any later version.
11
12 This file is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU Lesser General Public License for more details.
16
17 You should have received a copy of the GNU Lesser General Public License
18 along with this program. If not, see <https://www.gnu.org/licenses/>. */
19
20 #ifndef _MD5_H
21 #define _MD5_H 1
22
23 /* This file uses HAVE_OPENSSL_MD5. */
24 #if !_GL_CONFIG_H_INCLUDED
25 #error "Please include config.h first."
26 #endif
27
28 #include <stdio.h>
29 #include <stdint.h>
30
31 # if HAVE_OPENSSL_MD5
32 # ifndef OPENSSL_API_COMPAT
33 # define OPENSSL_API_COMPAT 0x10101000L /* FIXME: Use OpenSSL 1.1+ API. */
34 # endif
35 # include <openssl/md5.h>
36 # endif
37
38 #define MD5_DIGEST_SIZE 16
39 #define MD5_BLOCK_SIZE 64
40
41 #ifndef __GNUC_PREREQ
42 # if defined __GNUC__ && defined __GNUC_MINOR__
43 # define __GNUC_PREREQ(maj, min) \
44 ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
45 # else
46 # define __GNUC_PREREQ(maj, min) 0
47 # endif
48 #endif
49
50 #ifndef __THROW
51 # if defined __cplusplus && (__GNUC_PREREQ (2,8) || __clang_major__ >= 4)
52 # define __THROW throw ()
53 # else
54 # define __THROW
55 # endif
56 #endif
57
58 #ifndef _LIBC
59 # define __md5_buffer md5_buffer
60 # define __md5_finish_ctx md5_finish_ctx
61 # define __md5_init_ctx md5_init_ctx
62 # define __md5_process_block md5_process_block
63 # define __md5_process_bytes md5_process_bytes
64 # define __md5_read_ctx md5_read_ctx
65 # define __md5_stream md5_stream
66 #endif
67
68 # ifdef __cplusplus
69 extern "C" {
70 # endif
71
72 # if HAVE_OPENSSL_MD5
73 # define GL_OPENSSL_NAME 5
74 # include "gl_openssl.h"
75 # else
76 /* Structure to save state of computation between the single steps. */
77 struct md5_ctx
78 {
79 uint32_t A;
80 uint32_t B;
81 uint32_t C;
82 uint32_t D;
83
84 uint32_t total[2];
85 uint32_t buflen; /* ≥ 0, ≤ 128 */
86 uint32_t buffer[32]; /* 128 bytes; the first buflen bytes are in use */
87 };
88
89 /*
90 * The following three functions are build up the low level used in
91 * the functions 'md5_stream' and 'md5_buffer'.
92 */
93
94 /* Initialize structure containing state of computation.
95 (RFC 1321, 3.3: Step 3) */
96 extern void __md5_init_ctx (struct md5_ctx *ctx) __THROW;
97
98 /* Starting with the result of former calls of this function (or the
99 initialization function update the context for the next LEN bytes
100 starting at BUFFER.
101 It is necessary that LEN is a multiple of 64!!! */
102 extern void __md5_process_block (const void *buffer, size_t len,
103 struct md5_ctx *ctx) __THROW;
104
105 /* Starting with the result of former calls of this function (or the
106 initialization function update the context for the next LEN bytes
107 starting at BUFFER.
108 It is NOT required that LEN is a multiple of 64. */
109 extern void __md5_process_bytes (const void *buffer, size_t len,
110 struct md5_ctx *ctx) __THROW;
111
112 /* Process the remaining bytes in the buffer and put result from CTX
113 in first 16 bytes following RESBUF. The result is always in little
114 endian byte order, so that a byte-wise output yields to the wanted
115 ASCII representation of the message digest. */
116 extern void *__md5_finish_ctx (struct md5_ctx *ctx, void *restrict resbuf)
117 __THROW;
118
119
120 /* Put result from CTX in first 16 bytes following RESBUF. The result is
121 always in little endian byte order, so that a byte-wise output yields
122 to the wanted ASCII representation of the message digest. */
123 extern void *__md5_read_ctx (const struct md5_ctx *ctx, void *restrict resbuf)
124 __THROW;
125
126
127 /* Compute MD5 message digest for LEN bytes beginning at BUFFER. The
128 result is always in little endian byte order, so that a byte-wise
129 output yields to the wanted ASCII representation of the message
130 digest. */
131 extern void *__md5_buffer (const char *buffer, size_t len,
132 void *restrict resblock) __THROW;
133
134 # endif
135
136 /* Compute MD5 message digest for bytes read from STREAM.
137 STREAM is an open file stream. Regular files are handled more efficiently.
138 The contents of STREAM from its current position to its end will be read.
139 The case that the last operation on STREAM was an 'ungetc' is not supported.
140 The resulting message digest number will be written into the 16 bytes
141 beginning at RESBLOCK. */
142 extern int __md5_stream (FILE *stream, void *resblock) __THROW;
143
144
145 # ifdef __cplusplus
146 }
147 # endif
148
149 #endif /* md5.h */
150
151 /*
152 * Hey Emacs!
153 * Local Variables:
154 * coding: utf-8
155 * End:
156 */