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md5.h
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1 /* Declaration of functions and data types used for MD5 sum computing
2  library functions.
3  Copyright (C) 1995-1997, 1999-2001, 2004-2006, 2008-2019 Free Software
4  Foundation, Inc.
5  This file is part of the GNU C Library.
6 
7  This program is free software; you can redistribute it and/or modify it
8  under the terms of the GNU Lesser General Public License as published by the
9  Free Software Foundation; either version 2.1, or (at your option) any
10  later version.
11 
12  This program 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 #include <stdio.h>
24 #include <stdint.h>
25 
26 # if HAVE_OPENSSL_MD5
27 # include <openssl/md5.h>
28 # endif
29 
30 #define MD5_DIGEST_SIZE 16
31 #define MD5_BLOCK_SIZE 64
32 
33 #ifndef __GNUC_PREREQ
34 # if defined __GNUC__ && defined __GNUC_MINOR__
35 # define __GNUC_PREREQ(maj, min) \
36  ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
37 # else
38 # define __GNUC_PREREQ(maj, min) 0
39 # endif
40 #endif
41 
42 #ifndef __THROW
43 # if defined __cplusplus && __GNUC_PREREQ (2,8)
44 # define __THROW throw ()
45 # else
46 # define __THROW
47 # endif
48 #endif
49 
50 #ifndef _LIBC
51 # define __md5_buffer md5_buffer
52 # define __md5_finish_ctx md5_finish_ctx
53 # define __md5_init_ctx md5_init_ctx
54 # define __md5_process_block md5_process_block
55 # define __md5_process_bytes md5_process_bytes
56 # define __md5_read_ctx md5_read_ctx
57 # define __md5_stream md5_stream
58 #endif
59 
60 # ifdef __cplusplus
61 extern "C" {
62 # endif
63 
64 # if HAVE_OPENSSL_MD5
65 # define GL_OPENSSL_NAME 5
66 # include "gl_openssl.h"
67 # else
68 /* Structure to save state of computation between the single steps. */
69 struct md5_ctx
70 {
71  uint32_t A;
72  uint32_t B;
73  uint32_t C;
74  uint32_t D;
75 
76  uint32_t total[2];
77  uint32_t buflen; /* ≥ 0, ≤ 128 */
78  uint32_t buffer[32]; /* 128 bytes; the first buflen bytes are in use */
79 };
80 
81 /*
82  * The following three functions are build up the low level used in
83  * the functions 'md5_stream' and 'md5_buffer'.
84  */
85 
86 /* Initialize structure containing state of computation.
87  (RFC 1321, 3.3: Step 3) */
88 extern void __md5_init_ctx (struct md5_ctx *ctx) __THROW;
89 
90 /* Starting with the result of former calls of this function (or the
91  initialization function update the context for the next LEN bytes
92  starting at BUFFER.
93  It is necessary that LEN is a multiple of 64!!! */
94 extern void __md5_process_block (const void *buffer, size_t len,
95  struct md5_ctx *ctx) __THROW;
96 
97 /* Starting with the result of former calls of this function (or the
98  initialization function update the context for the next LEN bytes
99  starting at BUFFER.
100  It is NOT required that LEN is a multiple of 64. */
101 extern void __md5_process_bytes (const void *buffer, size_t len,
102  struct md5_ctx *ctx) __THROW;
103 
104 /* Process the remaining bytes in the buffer and put result from CTX
105  in first 16 bytes following RESBUF. The result is always in little
106  endian byte order, so that a byte-wise output yields to the wanted
107  ASCII representation of the message digest. */
108 extern void *__md5_finish_ctx (struct md5_ctx *ctx, void *resbuf) __THROW;
109 
110 
111 /* Put result from CTX in first 16 bytes following RESBUF. The result is
112  always in little endian byte order, so that a byte-wise output yields
113  to the wanted ASCII representation of the message digest. */
114 extern void *__md5_read_ctx (const struct md5_ctx *ctx, void *resbuf) __THROW;
115 
116 
117 /* Compute MD5 message digest for LEN bytes beginning at BUFFER. The
118  result is always in little endian byte order, so that a byte-wise
119  output yields to the wanted ASCII representation of the message
120  digest. */
121 extern void *__md5_buffer (const char *buffer, size_t len,
122  void *resblock) __THROW;
123 
124 # endif
125 /* Compute MD5 message digest for bytes read from STREAM.
126  STREAM is an open file stream. Regular files are handled more efficiently.
127  The contents of STREAM from its current position to its end will be read.
128  The case that the last operation on STREAM was an 'ungetc' is not supported.
129  The resulting message digest number will be written into the 16 bytes
130  beginning at RESBLOCK. */
131 extern int __md5_stream (FILE *stream, void *resblock) __THROW;
132 
133 
134 # ifdef __cplusplus
135 }
136 # endif
137 
138 #endif /* md5.h */
139 
140 /*
141  * Hey Emacs!
142  * Local Variables:
143  * coding: utf-8
144  * End:
145  */
#define __md5_stream
Definition: md5.h:57
#define __THROW
Definition: md5.h:46
uint32_t D
Definition: md5.h:74
#define __md5_read_ctx
Definition: md5.h:56
#define __md5_process_block
Definition: md5.h:54
uint32_t A
Definition: md5.h:71
#define __md5_finish_ctx
Definition: md5.h:52
uint32_t buflen
Definition: md5.h:77
#define __md5_process_bytes
Definition: md5.h:55
#define __md5_init_ctx
Definition: md5.h:53
uint32_t buffer[32]
Definition: md5.h:78
uint32_t total[2]
Definition: md5.h:76
uint32_t B
Definition: md5.h:72
uint32_t C
Definition: md5.h:73
#define __md5_buffer
Definition: md5.h:51
Definition: md5.h:69