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1 | /* Declaration of functions and data types used for MD5 sum computing |
2 | library functions. | |
35d30630 | 3 | Copyright (C) 1995,1996,1997,1999,2000,2001 Free Software Foundation, Inc. |
68dbb3a6 UD |
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 | |
41bdb6e2 AJ |
7 | modify it under the terms of the GNU Lesser General Public |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
68dbb3a6 UD |
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 | |
41bdb6e2 | 14 | Lesser General Public License for more details. |
68dbb3a6 | 15 | |
41bdb6e2 AJ |
16 | You should have received a copy of the GNU Lesser General Public |
17 | License along with the GNU C Library; if not, write to the Free | |
18 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
19 | 02111-1307 USA. */ | |
68dbb3a6 UD |
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 | |
35d30630 UD |
38 | # include <stdint.h> |
39 | typedef uint32_t md5_uint32; | |
40 | typedef uintptr_t md5_uintptr; | |
68dbb3a6 UD |
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 | |
35d30630 UD |
72 | /* We have to make a guess about the integer type equivalent in size |
73 | to pointers which should always be correct. */ | |
74 | typedef unsigned long int md5_uintptr; | |
68dbb3a6 UD |
75 | #endif |
76 | ||
77 | #undef __P | |
78 | #if defined (__STDC__) && __STDC__ | |
36775c3b | 79 | # define __P(x) x |
68dbb3a6 | 80 | #else |
36775c3b | 81 | # define __P(x) () |
68dbb3a6 UD |
82 | #endif |
83 | ||
84 | /* Structure to save state of computation between the single steps. */ | |
85 | struct md5_ctx | |
86 | { | |
87 | md5_uint32 A; | |
88 | md5_uint32 B; | |
89 | md5_uint32 C; | |
90 | md5_uint32 D; | |
91 | ||
92 | md5_uint32 total[2]; | |
93 | md5_uint32 buflen; | |
3248e3a3 | 94 | char buffer[128] __attribute__ ((__aligned__ (__alignof__ (md5_uint32)))); |
68dbb3a6 UD |
95 | }; |
96 | ||
97 | /* | |
98 | * The following three functions are build up the low level used in | |
99 | * the functions `md5_stream' and `md5_buffer'. | |
100 | */ | |
101 | ||
102 | /* Initialize structure containing state of computation. | |
103 | (RFC 1321, 3.3: Step 3) */ | |
b13927da | 104 | extern void __md5_init_ctx __P ((struct md5_ctx *ctx)); |
68dbb3a6 UD |
105 | |
106 | /* Starting with the result of former calls of this function (or the | |
107 | initialization function update the context for the next LEN bytes | |
108 | starting at BUFFER. | |
109 | It is necessary that LEN is a multiple of 64!!! */ | |
b13927da UD |
110 | extern void __md5_process_block __P ((const void *buffer, size_t len, |
111 | struct md5_ctx *ctx)); | |
68dbb3a6 UD |
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 | It is NOT required that LEN is a multiple of 64. */ | |
b13927da UD |
117 | extern void __md5_process_bytes __P ((const void *buffer, size_t len, |
118 | struct md5_ctx *ctx)); | |
68dbb3a6 UD |
119 | |
120 | /* Process the remaining bytes in the buffer and put result from CTX | |
121 | in first 16 bytes following RESBUF. The result is always in little | |
122 | endian byte order, so that a byte-wise output yields to the wanted | |
123 | ASCII representation of the message digest. | |
124 | ||
125 | IMPORTANT: On some systems it is required that RESBUF is correctly | |
126 | aligned for a 32 bits value. */ | |
b13927da | 127 | extern void *__md5_finish_ctx __P ((struct md5_ctx *ctx, void *resbuf)); |
68dbb3a6 UD |
128 | |
129 | ||
130 | /* Put result from CTX in first 16 bytes following RESBUF. The result is | |
131 | always in little endian byte order, so that a byte-wise output yields | |
132 | to the wanted ASCII representation of the message digest. | |
133 | ||
134 | IMPORTANT: On some systems it is required that RESBUF is correctly | |
135 | aligned for a 32 bits value. */ | |
b13927da | 136 | extern void *__md5_read_ctx __P ((const struct md5_ctx *ctx, void *resbuf)); |
68dbb3a6 UD |
137 | |
138 | ||
139 | /* Compute MD5 message digest for bytes read from STREAM. The | |
140 | resulting message digest number will be written into the 16 bytes | |
141 | beginning at RESBLOCK. */ | |
b13927da | 142 | extern int __md5_stream __P ((FILE *stream, void *resblock)); |
68dbb3a6 UD |
143 | |
144 | /* Compute MD5 message digest for LEN bytes beginning at BUFFER. The | |
145 | result is always in little endian byte order, so that a byte-wise | |
146 | output yields to the wanted ASCII representation of the message | |
147 | digest. */ | |
b13927da UD |
148 | extern void *__md5_buffer __P ((const char *buffer, size_t len, |
149 | void *resblock)); | |
68dbb3a6 | 150 | |
36775c3b | 151 | #endif /* md5.h */ |