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718e3744 | 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 */ |