1 /* md5.h - Declaration of functions and data types used for MD5 sum
2 computing library functions.
3 Copyright 1995, 1996, 2000 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.
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
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.
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. */
26 #if defined HAVE_LIMITS_H || _LIBC
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. */
38 # include <sys/types.h>
39 typedef u_int32_t md5_uint32
;
41 # define INT_MAX_32_BITS 2147483647
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. */
49 # define INT_MAX INT_MAX_32_BITS
52 # if INT_MAX == INT_MAX_32_BITS
53 typedef unsigned int md5_uint32
;
55 # if SHRT_MAX == INT_MAX_32_BITS
56 typedef unsigned short md5_uint32
;
58 # if LONG_MAX == INT_MAX_32_BITS
59 typedef unsigned long md5_uint32
;
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."
70 #if defined (__STDC__) && __STDC__
76 /* Structure to save state of computation between the single steps. */
90 * The following three functions are build up the low level used in
91 * the functions `md5_stream' and `md5_buffer'.
94 /* Initialize structure containing state of computation.
95 (RFC 1321, 3.3: Step 3) */
96 extern void md5_init_ctx
__P ((struct md5_ctx
*ctx
));
98 /* Starting with the result of former calls of this function (or the
99 initialization function update the context for the next LEN bytes
101 It is necessary that LEN is a multiple of 64!!! */
102 extern void md5_process_block
__P ((const void *buffer
, size_t len
,
103 struct md5_ctx
*ctx
));
105 /* Starting with the result of former calls of this function (or the
106 initialization function update the context for the next LEN bytes
108 It is NOT required that LEN is a multiple of 64. */
109 extern void md5_process_bytes
__P ((const void *buffer
, size_t len
,
110 struct md5_ctx
*ctx
));
112 /* Process the remaining bytes in the buffer and put result from CTX
113 in first 16 bytes following RESBUF. The result is always in little
114 endian byte order, so that a byte-wise output yields to the wanted
115 ASCII representation of the message digest.
117 IMPORTANT: On some systems it is required that RESBUF is correctly
118 aligned for a 32 bits value. */
119 extern void *md5_finish_ctx
__P ((struct md5_ctx
*ctx
, void *resbuf
));
122 /* Put result from CTX in first 16 bytes following RESBUF. The result is
123 always in little endian byte order, so that a byte-wise output yields
124 to the wanted ASCII representation of the message digest.
126 IMPORTANT: On some systems it is required that RESBUF is correctly
127 aligned for a 32 bits value. */
128 extern void *md5_read_ctx
__P ((const struct md5_ctx
*ctx
, void *resbuf
));
131 /* Compute MD5 message digest for bytes read from STREAM. The
132 resulting message digest number will be written into the 16 bytes
133 beginning at RESBLOCK. */
134 extern int md5_stream
__P ((FILE *stream
, void *resblock
));
136 /* Compute MD5 message digest for LEN bytes beginning at BUFFER. The
137 result is always in little endian byte order, so that a byte-wise
138 output yields to the wanted ASCII representation of the message
140 extern void *md5_buffer
__P ((const char *buffer
, size_t len
, void *resblock
));
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