QOF: md5.h Source File

QOF 0.7.5

md5.h
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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
20
21 #ifndef _MD5_H
22 #define _MD5_H 1
23
24 #include <stddef.h>
25 #include <stdio.h>
26
27 #if defined HAVE_LIMITS_H || _LIBC
28 # include <limits.h>
29 #endif
30
31 /* The following contortions are an attempt to use the C preprocessor
32 to determine an unsigned integral type that is 32 bits wide. An
33 alternative approach is to use autoconf's AC_CHECK_SIZEOF macro, but
34 doing that would require that the configure script compile and *run*
35 the resulting executable. Locally running cross-compiled executables
36 is usually not possible. */
37
38 #ifdef _LIBC
39 # include <sys/types.h>
40 typedef u_int32_t md5_uint32;
41 #else
42 # if defined __STDC__ && __STDC__
43 # define UINT_MAX_32_BITS 4294967295U
44 # else
45 # define UINT_MAX_32_BITS 0xFFFFFFFF
46 # endif
47
48 /* If UINT_MAX isn't defined, assume it's a 32-bit type.
49 This should be valid for all systems GNU cares about because
50 that doesn't include 16-bit systems, and only modern systems
51 (that certainly have <limits.h>) have 64+-bit integral types. */
52
53 # ifndef UINT_MAX
54 # define UINT_MAX UINT_MAX_32_BITS
55 # endif
56
57 # if UINT_MAX == UINT_MAX_32_BITS
58 typedef unsigned int md5_uint32;
59 # else
60 # if USHRT_MAX == UINT_MAX_32_BITS
61 typedef unsigned short md5_uint32;
62 # else
63 # if ULONG_MAX == UINT_MAX_32_BITS
64 typedef unsigned long md5_uint32;
65 # else
66 /* The following line is intended to evoke an error.
67 Using #error is not portable enough. */
68 "Cannot determine unsigned 32-bit data type."
69 # endif
70 # endif
71 # endif
72 #endif
73 #undef __P
74 #if defined (__STDC__) && __STDC__
75 #define __P(x) x
76 #else
77 #define __P(x) ()
78 #endif
79 /* Structure to save state of computation between the single steps. */
80 struct md5_ctx
81 {
82 md5_uint32 A;
83 md5_uint32 B;
84 md5_uint32 C;
85 md5_uint32 D;
86
87 md5_uint32 total[2];
88 md5_uint32 buflen;
89 char buffer[128];
90 };
91
92 /*
93 * The following three functions are build up the low level used in
94 * the functions `md5_stream' and `md5_buffer'.
95 */
96
97 /* Initialize structure containing state of computation.
98 (RFC 1321, 3.3: Step 3) */
99 extern void md5_init_ctx __P ((struct md5_ctx * ctx));
100
101
102 /* Starting with the result of former calls of this function (or the
103 initialization function update the context for the next LEN bytes
104 starting at BUFFER.
105
106 It is necessary that LEN is a multiple of 64!!!
107
108 IMPORTANT: On some systems it is required that buffer be 32-bit
109 aligned. */
110 extern void md5_process_block __P ((const void *buffer, size_t len,
111 struct md5_ctx * ctx));
112
113 /* Starting with the result of former calls of this function (or the
114 initialization function) update the context for the next LEN bytes
115 starting at BUFFER.
116
117 It is NOT required that LEN is a multiple of 64.
118
119 IMPORTANT: On some systems it is required that buffer be 32-bit
120 aligned. */
121 extern void md5_process_bytes __P ((const void *buffer, size_t len,
122 struct md5_ctx * ctx));
123
124 /* Process the remaining bytes in the buffer and put result from CTX
125 in first 16 bytes following RESBUF. The result is always in little
126 endian byte order, so that a byte-wise output yields to the wanted
127 ASCII representation of the message digest.
128
129 IMPORTANT: On some systems it is required that RESBUF be correctly
130 aligned for a 32 bits value. */
131 extern void *md5_finish_ctx __P ((struct md5_ctx * ctx, void *resbuf));
132
133
134 /* Put result from CTX in first 16 bytes following RESBUF. The result is
135 always in little endian byte order, so that a byte-wise output yields
136 to the wanted ASCII representation of the message digest.
137
138 IMPORTANT: On some systems it is required that RESBUF be correctly
139 aligned for a 32 bits value. */
140 extern void *md5_read_ctx __P ((const struct md5_ctx * ctx, void *resbuf));
141
142
143 /* Compute MD5 message digest for bytes read from STREAM. The
144 resulting message digest number will be written into the 16 bytes
145 beginning at RESBLOCK.
146
147 IMPORTANT: On some systems it is required that resblock be 32-bit
148 aligned. */
149 extern int md5_stream __P ((FILE * stream, void *resblock));
150
151
152 /* Compute MD5 message digest for LEN bytes beginning at BUFFER. The
153 result is always in little endian byte order, so that a byte-wise
154 output yields to the wanted ASCII representation of the message
155 digest.
156
157 IMPORTANT: On some systems it is required that buffer and resblock
158 be correctly 32-bit aligned. */
159 extern void *md5_buffer
160 __P ((const char *buffer, size_t len, void *resblock));
161
162 #endif
md5_ctx
Definition: md5.h:80