1 /* md5.h - Declaration of functions and data types used for MD5 sum
2 computing library functions.
3 Copyright (C) 1995, 1996, 1999 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., 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 #include <limits.h>
26
27 /* The following contortions are an attempt to use the C preprocessor
28 to determine an unsigned integral type that is 32 bits wide. An
29 alternative approach is to use autoconf's AC_CHECK_SIZEOF macro, but
30 doing that would require that the configure script compile and *run*
31 the resulting executable. Locally running cross-compiled executables
32 is usually not possible. */
33
34 #if HAVE_INTTYPES_H || HAVE_STDINT_H
35 # if HAVE_INTTYPES_H
36 # include <inttypes.h>
37 # else
38 # include <stdint.h>
39 # endif
40 typedef uint32_t md5_uint32;
41 typedef uintptr_t md5_uintptr;
42 #else
43 # if defined __STDC__ && __STDC__
44 # define UINT_MAX_32_BITS 4294967295U
45 # else
46 # define UINT_MAX_32_BITS 0xFFFFFFFF
47 # endif
48
49 /* If UINT_MAX isn't defined, assume it's a 32-bit type.
50 This should be valid for all systems GNU cares about because
51 that doesn't include 16-bit systems, and only modern systems
52 (that certainly have <limits.h>) have 64+-bit integral types. */
53
54 # ifndef UINT_MAX
55 # define UINT_MAX UINT_MAX_32_BITS
56 # endif
57
58 # if UINT_MAX == UINT_MAX_32_BITS
59 typedef unsigned int md5_uint32;
60 # else
61 # if USHRT_MAX == UINT_MAX_32_BITS
62 typedef unsigned short md5_uint32;
63 # else
64 # if ULONG_MAX == UINT_MAX_32_BITS
65 typedef unsigned long md5_uint32;
66 # else
67 /* The following line is intended to evoke an error.
68 Using #error is not portable enough. */
69 "Cannot determine unsigned 32-bit data type."
70 # endif
71 # endif
72 # endif
73 /* We have to make a guess about the integer type equivalent in size
74 to pointers which should always be correct. */
75 typedef unsigned long int md5_uintptr;
76 #endif
77
78 #undef __P
79 #if defined (__STDC__) && __STDC__
80 #define __P(x) x
81 #else
82 #define __P(x) ()
83 #endif
84
85 /* Structure to save state of computation between the single steps. */
86 struct md5_ctx
87 {
88 md5_uint32 A;
89 md5_uint32 B;
90 md5_uint32 C;
91 md5_uint32 D;
92
93 md5_uint32 total[2];
94 md5_uint32 buflen;
95 char buffer[128];
96 };
97
98 /*
99 * The following three functions are build up the low level used in
100 * the functions `md5_stream' and `md5_buffer'.
101 */
102
103 /* Initialize structure containing state of computation.
104 (RFC 1321, 3.3: Step 3) */
105 extern void md5_init_ctx __P ((struct md5_ctx *ctx));
106
107 /* Starting with the result of former calls of this function (or the
108 initialization function update the context for the next LEN bytes
109 starting at BUFFER.
110 It is necessary that LEN is a multiple of 64!!! */
111 extern void md5_process_block __P ((const void *buffer, size_t len,
112 struct md5_ctx *ctx));
113
114 /* Starting with the result of former calls of this function (or the
115 initialization function update the context for the next LEN bytes
116 starting at BUFFER.
117 It is NOT required that LEN is a multiple of 64. */
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 be correctly
127 aligned for a 32 bits value. */
128 extern void *md5_finish_ctx __P ((struct md5_ctx *ctx, void *resbuf));
129
130
131 /* Put result from CTX in first 16 bytes following RESBUF. The result is
132 always in little endian byte order, so that a byte-wise output yields
133 to the wanted ASCII representation of the message digest.
134
135 IMPORTANT: On some systems it is required that RESBUF is correctly
136 aligned for a 32 bits value. */
137 extern void *md5_read_ctx __P ((const struct md5_ctx *ctx, void *resbuf));
138
139
140 /* Compute MD5 message digest for bytes read from STREAM. The
141 resulting message digest number will be written into the 16 bytes
142 beginning at RESBLOCK. */
143 extern int md5_stream __P ((FILE *stream, void *resblock));
144
145 /* Compute MD5 message digest for LEN bytes beginning at BUFFER. The
146 result is always in little endian byte order, so that a byte-wise
147 output yields to the wanted ASCII representation of the message
148 digest. */
149 extern void *md5_buffer __P ((const char *buffer, size_t len, void *resblock));
150
151 /* The following is from gnupg-1.0.2's cipher/bithelp.h. */
152 /* Rotate a 32 bit integer by n bytes */
153 #if defined __GNUC__ && defined __i386__
154 static inline md5_uint32
rol(md5_uint32 x,int n)155 rol(md5_uint32 x, int n)
156 {
157 __asm__("roll %%cl,%0"
158 :"=r" (x)
159 :"0" (x),"c" (n));
160 return x;
161 }
162 #else
163 # define rol(x,n) ( ((x) << (n)) | ((x) >> (32-(n))) )
164 #endif
165
166 #endif
167