bglibs: md5.h Source File

bglibs

md5.h
1 /* Declaration of functions and data types used for MD5 sum computing
2 library functions.
3 Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
4 This file is part of the GNU C Library.
5
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Library General Public License as
8 published by the Free Software Foundation; either version 2 of the
9 License, or (at your option) any later version.
10
11 The GNU C Library 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 GNU
14 Library General Public License for more details.
15
16 You should have received a copy of the GNU Library General Public
17 License along with the GNU C Library; see the file COPYING.LIB. If not,
18 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
20
21 #ifndef _MD5_H
22 #define _MD5_H 1
23
24 #include <stdio.h>
25
26 #if defined HAVE_LIMITS_H || _LIBC
27 # include <limits.h>
28 #endif
29
30 /* The following contortions are an attempt to use the C preprocessor
31 to determine an unsigned integral type that is 32 bits wide. An
32 alternative approach is to use autoconf's AC_CHECK_SIZEOF macro, but
33 doing that would require that the configure script compile and *run*
34 the resulting executable. Locally running cross-compiled executables
35 is usually not possible. */
36
37 #ifdef _LIBC
38 # include <sys/types.h>
39 typedef u_int32_t md5_uint32;
40 #else
41 # if defined __STDC__ && __STDC__
42 # define UINT_MAX_32_BITS 4294967295U
43 # else
44 # define UINT_MAX_32_BITS 0xFFFFFFFF
45 # endif
46
47 /* If UINT_MAX isn't defined, assume it's a 32-bit type.
48 This should be valid for all systems GNU cares about because
49 that doesn't include 16-bit systems, and only modern systems
50 (that certainly have <limits.h>) have 64+-bit integral types. */
51
52 # ifndef UINT_MAX
53 # define UINT_MAX UINT_MAX_32_BITS
54 # endif
55
56 # if UINT_MAX == UINT_MAX_32_BITS
57 typedef unsigned int md5_uint32;
58 # else
59 # if USHRT_MAX == UINT_MAX_32_BITS
60 typedef unsigned short md5_uint32;
61 # else
62 # if ULONG_MAX == UINT_MAX_32_BITS
63 typedef unsigned long md5_uint32;
64 # else
65 /* The following line is intended to evoke an error.
66 Using #error is not portable enough. */
67 "Cannot determine unsigned 32-bit data type."
68 # endif
69 # endif
70 # endif
71 #endif
72
73 #undef __P
74 #if defined (__STDC__) && __STDC__
75 # define __P(x) x
76 #else
77 # define __P(x) ()
78 #endif
79
80 /* Structure to save state of computation between the single steps. */
81 struct md5_ctx
82 {
83 md5_uint32 A;
84 md5_uint32 B;
85 md5_uint32 C;
86 md5_uint32 D;
87
88 md5_uint32 total[2];
89 md5_uint32 buflen;
90 char buffer[128];
91 };
92
93 /*
94 * The following three functions are build up the low level used in
95 * the functions `md5_stream' and `md5_buffer'.
96 */
97
98 /* Initialize structure containing state of computation.
99 (RFC 1321, 3.3: Step 3) */
100 extern void __md5_init_ctx __P ((struct md5_ctx *ctx));
101 extern void md5_init_ctx __P ((struct md5_ctx *ctx));
102
103 /* Starting with the result of former calls of this function (or the
104 initialization function update the context for the next LEN bytes
105 starting at BUFFER.
106 It is necessary that LEN is a multiple of 64!!! */
107 extern void __md5_process_block __P ((const void *buffer, size_t len,
108 struct md5_ctx *ctx));
109 extern void md5_process_block __P ((const void *buffer, size_t len,
110 struct md5_ctx *ctx));
111
112 /* Starting with the result of former calls of this function (or the
113 initialization function update the context for the next LEN bytes
114 starting at BUFFER.
115 It is NOT required that LEN is a multiple of 64. */
116 extern void __md5_process_bytes __P ((const void *buffer, size_t len,
117 struct md5_ctx *ctx));
118 extern void md5_process_bytes __P ((const void *buffer, size_t len,
119 struct md5_ctx *ctx));
120
121 /* Process the remaining bytes in the buffer and put result from CTX
122 in first 16 bytes following RESBUF. The result is always in little
123 endian byte order, so that a byte-wise output yields to the wanted
124 ASCII representation of the message digest.
125
126 IMPORTANT: On some systems it is required that RESBUF is correctly
127 aligned for a 32 bits value. */
128 extern void *__md5_finish_ctx __P ((struct md5_ctx *ctx, void *resbuf));
129 extern void *md5_finish_ctx __P ((struct md5_ctx *ctx, void *resbuf));
130
131
132 /* Put result from CTX in first 16 bytes following RESBUF. The result is
133 always in little endian byte order, so that a byte-wise output yields
134 to the wanted ASCII representation of the message digest.
135
136 IMPORTANT: On some systems it is required that RESBUF is correctly
137 aligned for a 32 bits value. */
138 extern void *__md5_read_ctx __P ((const struct md5_ctx *ctx, void *resbuf));
139 extern void *md5_read_ctx __P ((const struct md5_ctx *ctx, void *resbuf));
140
141
142 /* Compute MD5 message digest for bytes read from STREAM. The
143 resulting message digest number will be written into the 16 bytes
144 beginning at RESBLOCK. */
145 extern int __md5_stream __P ((FILE *stream, void *resblock));
146
147 /* Compute MD5 message digest for LEN bytes beginning at BUFFER. The
148 result is always in little endian byte order, so that a byte-wise
149 output yields to the wanted ASCII representation of the message
150 digest. */
151 extern void *__md5_buffer __P ((const char *buffer, size_t len,
152 void *resblock));
153 extern void *md5_buffer __P ((const char *buffer, size_t len,
154 void *resblock));
155
156 #endif /* md5.h */
md5_ctx
Definition: md5.h:81