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1 | /* md5.h - Declaration of functions and data types used for MD5 sum |
2 | computing library functions. | |
4f1d9bd8 | 3 | Copyright 1995, 1996, 2000 Free Software Foundation, Inc. |
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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 | #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 | # define INT_MAX_32_BITS 2147483647 | |
42 | ||
43 | /* If UINT_MAX isn't defined, assume it's a 32-bit type. | |
44 | This should be valid for all systems GNU cares about because | |
45 | that doesn't include 16-bit systems, and only modern systems | |
46 | (that certainly have <limits.h>) have 64+-bit integral types. */ | |
47 | ||
48 | # ifndef INT_MAX | |
49 | # define INT_MAX INT_MAX_32_BITS | |
50 | # endif | |
51 | ||
52 | # if INT_MAX == INT_MAX_32_BITS | |
53 | typedef unsigned int md5_uint32; | |
54 | # else | |
55 | # if SHRT_MAX == INT_MAX_32_BITS | |
56 | typedef unsigned short md5_uint32; | |
57 | # else | |
58 | # if LONG_MAX == INT_MAX_32_BITS | |
59 | typedef unsigned long md5_uint32; | |
60 | # else | |
61 | /* The following line is intended to evoke an error. | |
62 | Using #error is not portable enough. */ | |
63 | "Cannot determine unsigned 32-bit data type." | |
64 | # endif | |
65 | # endif | |
66 | # endif | |
67 | #endif | |
68 | ||
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69 | /* Structure to save state of computation between the single steps. */ |
70 | struct md5_ctx | |
71 | { | |
72 | md5_uint32 A; | |
73 | md5_uint32 B; | |
74 | md5_uint32 C; | |
75 | md5_uint32 D; | |
76 | ||
77 | md5_uint32 total[2]; | |
78 | md5_uint32 buflen; | |
79 | char buffer[128]; | |
80 | }; | |
81 | ||
82 | /* | |
83 | * The following three functions are build up the low level used in | |
84 | * the functions `md5_stream' and `md5_buffer'. | |
85 | */ | |
86 | ||
87 | /* Initialize structure containing state of computation. | |
88 | (RFC 1321, 3.3: Step 3) */ | |
49b1fae4 | 89 | extern void md5_init_ctx (struct md5_ctx *ctx); |
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90 | |
91 | /* Starting with the result of former calls of this function (or the | |
92 | initialization function update the context for the next LEN bytes | |
93 | starting at BUFFER. | |
94 | It is necessary that LEN is a multiple of 64!!! */ | |
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95 | extern void md5_process_block (const void *buffer, size_t len, |
96 | struct md5_ctx *ctx); | |
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97 | |
98 | /* Starting with the result of former calls of this function (or the | |
99 | initialization function update the context for the next LEN bytes | |
100 | starting at BUFFER. | |
101 | It is NOT required that LEN is a multiple of 64. */ | |
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102 | extern void md5_process_bytes (const void *buffer, size_t len, |
103 | struct md5_ctx *ctx); | |
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104 | |
105 | /* Process the remaining bytes in the buffer and put result from CTX | |
106 | in first 16 bytes following RESBUF. The result is always in little | |
107 | endian byte order, so that a byte-wise output yields to the wanted | |
108 | ASCII representation of the message digest. | |
109 | ||
110 | IMPORTANT: On some systems it is required that RESBUF is correctly | |
111 | aligned for a 32 bits value. */ | |
49b1fae4 | 112 | extern void *md5_finish_ctx (struct md5_ctx *ctx, void *resbuf); |
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113 | |
114 | ||
115 | /* Put result from CTX in first 16 bytes following RESBUF. The result is | |
116 | always in little endian byte order, so that a byte-wise output yields | |
117 | to the wanted ASCII representation of the message digest. | |
118 | ||
119 | IMPORTANT: On some systems it is required that RESBUF is correctly | |
120 | aligned for a 32 bits value. */ | |
49b1fae4 | 121 | extern void *md5_read_ctx (const struct md5_ctx *ctx, void *resbuf); |
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122 | |
123 | ||
124 | /* Compute MD5 message digest for bytes read from STREAM. The | |
125 | resulting message digest number will be written into the 16 bytes | |
126 | beginning at RESBLOCK. */ | |
49b1fae4 | 127 | extern int md5_stream (FILE *stream, void *resblock); |
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128 | |
129 | /* Compute MD5 message digest for LEN bytes beginning at BUFFER. The | |
130 | result is always in little endian byte order, so that a byte-wise | |
131 | output yields to the wanted ASCII representation of the message | |
132 | digest. */ | |
49b1fae4 | 133 | extern void *md5_buffer (const char *buffer, size_t len, void *resblock); |
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134 | |
135 | #endif |