source: trunk/essentials/net-misc/wget/src/gnu-md5.h

Last change on this file was 3440, checked in by bird, 18 years ago

wget 1.10.2
File size: 4.9 KB
Line 
1/* md5.h - Declaration of functions and data types used for MD5 sum
2 computing library functions.
3 Copyright (C) 1995, 1996 Free Software Foundation, Inc.
4 NOTE: The canonical source of this file is maintained with the GNU C
5 Library. Bugs can be reported to bug-glibc@prep.ai.mit.edu.
6
7 This program is free software; you can redistribute it and/or modify it
8 under the terms of the GNU General Public License as published by the
9 Free Software Foundation; either version 2, 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 General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software Foundation,
19 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
20
21#ifndef _MD5_H
22#define _MD5_H 1
23
24#if defined HAVE_LIMITS_H || _LIBC
25# include <limits.h>
26#endif
27
28/* The following contortions are an attempt to use the C preprocessor
29 to determine an unsigned integral type that is 32 bits wide. An
30 alternative approach is to use autoconf's AC_CHECK_SIZEOF macro, but
31 doing that would require that the configure script compile and *run*
32 the resulting executable. Locally running cross-compiled executables
33 is usually not possible. */
34
35#ifdef _LIBC
36# include <sys/types.h>
37typedef u_int32_t md5_uint32;
38#else
39# if defined __STDC__ && __STDC__
40# define UINT_MAX_32_BITS 4294967295U
41# else
42# define UINT_MAX_32_BITS 0xFFFFFFFF
43# endif
44
45/* If UINT_MAX isn't defined, assume it's a 32-bit type.
46 This should be valid for all systems GNU cares about because
47 that doesn't include 16-bit systems, and only modern systems
48 (that certainly have <limits.h>) have 64+-bit integral types. */
49
50# ifndef UINT_MAX
51# define UINT_MAX UINT_MAX_32_BITS
52# endif
53
54# if UINT_MAX == UINT_MAX_32_BITS
55 typedef unsigned int md5_uint32;
56# else
57# if USHRT_MAX == UINT_MAX_32_BITS
58 typedef unsigned short md5_uint32;
59# else
60# if ULONG_MAX == UINT_MAX_32_BITS
61 typedef unsigned long md5_uint32;
62# else
63 /* The following line is intended to evoke an error.
64 Using #error is not portable enough. */
65 "Cannot determine unsigned 32-bit data type."
66# endif
67# endif
68# endif
69#endif
70
71/* Structure to save state of computation between the single steps. */
72struct md5_ctx
73{
74 md5_uint32 A;
75 md5_uint32 B;
76 md5_uint32 C;
77 md5_uint32 D;
78
79 md5_uint32 total[2];
80 md5_uint32 buflen;
81 char buffer[128];
82};
83
84/*
85 * The following three functions are build up the low level used in
86 * the functions `md5_stream' and `md5_buffer'.
87 */
88
89/* Initialize structure containing state of computation.
90 (RFC 1321, 3.3: Step 3) */
91extern void md5_init_ctx PARAMS ((struct md5_ctx *ctx));
92
93/* Starting with the result of former calls of this function (or the
94 initialization function update the context for the next LEN bytes
95 starting at BUFFER.
96 It is necessary that LEN is a multiple of 64!!! */
97extern void md5_process_block PARAMS ((const void *buffer, size_t len,
98 struct md5_ctx *ctx));
99
100/* Starting with the result of former calls of this function (or the
101 initialization function update the context for the next LEN bytes
102 starting at BUFFER.
103 It is NOT required that LEN is a multiple of 64. */
104extern void md5_process_bytes PARAMS ((const void *buffer, size_t len,
105 struct md5_ctx *ctx));
106
107/* Process the remaining bytes in the buffer and put result from CTX
108 in first 16 bytes following RESBUF. The result is always in little
109 endian byte order, so that a byte-wise output yields to the wanted
110 ASCII representation of the message digest.
111
112 IMPORTANT: On some systems it is required that RESBUF is correctly
113 aligned for a 32 bits value. */
114extern void *md5_finish_ctx PARAMS ((struct md5_ctx *ctx, void *resbuf));
115
116
117/* Put result from CTX in first 16 bytes following RESBUF. The result is
118 always in little endian byte order, so that a byte-wise output yields
119 to the wanted ASCII representation of the message digest.
120
121 IMPORTANT: On some systems it is required that RESBUF is correctly
122 aligned for a 32 bits value. */
123extern void *md5_read_ctx PARAMS ((const struct md5_ctx *ctx, void *resbuf));
124
125
126#if 0 /* Unused in Wget */
127/* Compute MD5 message digest for bytes read from STREAM. The
128 resulting message digest number will be written into the 16 bytes
129 beginning at RESBLOCK. */
130extern int md5_stream PARAMS ((FILE *stream, void *resblock));
131#endif
132
133/* Compute MD5 message digest for LEN bytes beginning at BUFFER. The
134 result is always in little endian byte order, so that a byte-wise
135 output yields to the wanted ASCII representation of the message
136 digest. */
137extern void *md5_buffer PARAMS ((const char *buffer, size_t len,
138 void *resblock));
139
140#endif
Note: See TracBrowser for help on using the repository browser.