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., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, 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
;
40 typedef uintptr_t md5_uintptr
;
42 # define INT_MAX_32_BITS 2147483647
44 /* If UINT_MAX isn't defined, assume it's a 32-bit type.
45 This should be valid for all systems GNU cares about because
46 that doesn't include 16-bit systems, and only modern systems
47 (that certainly have <limits.h>) have 64+-bit integral types. */
50 # define INT_MAX INT_MAX_32_BITS
53 # if INT_MAX == INT_MAX_32_BITS
54 typedef unsigned int md5_uint32
;
56 # if SHRT_MAX == INT_MAX_32_BITS
57 typedef unsigned short md5_uint32
;
59 # if LONG_MAX == INT_MAX_32_BITS
60 typedef unsigned long md5_uint32
;
62 /* The following line is intended to evoke an error.
63 Using #error is not portable enough. */
64 "Cannot determine unsigned 32-bit data type."
68 /* We have to make a guess about the integer type equivalent in size
69 to pointers which should always be correct. */
70 typedef unsigned long int md5_uintptr
;
73 /* Structure to save state of computation between the single steps. */
83 char buffer
[128] ATTRIBUTE_ALIGNED_ALIGNOF(md5_uint32
);
87 * The following three functions are build up the low level used in
88 * the functions `md5_stream' and `md5_buffer'.
91 /* Initialize structure containing state of computation.
92 (RFC 1321, 3.3: Step 3) */
93 extern void md5_init_ctx (struct md5_ctx
*ctx
);
95 /* Starting with the result of former calls of this function (or the
96 initialization function update the context for the next LEN bytes
98 It is necessary that LEN is a multiple of 64!!! */
99 extern void md5_process_block (const void *buffer
, size_t len
,
100 struct md5_ctx
*ctx
);
102 /* Starting with the result of former calls of this function (or the
103 initialization function update the context for the next LEN bytes
105 It is NOT required that LEN is a multiple of 64. */
106 extern void md5_process_bytes (const void *buffer
, size_t len
,
107 struct md5_ctx
*ctx
);
109 /* Process the remaining bytes in the buffer and put result from CTX
110 in first 16 bytes following RESBUF. The result is always in little
111 endian byte order, so that a byte-wise output yields to the wanted
112 ASCII representation of the message digest.
114 IMPORTANT: On some systems it is required that RESBUF is correctly
115 aligned for a 32 bits value. */
116 extern void *md5_finish_ctx (struct md5_ctx
*ctx
, void *resbuf
);
119 /* Put result from CTX in first 16 bytes following RESBUF. The result is
120 always in little endian byte order, so that a byte-wise output yields
121 to the wanted ASCII representation of the message digest.
123 IMPORTANT: On some systems it is required that RESBUF is correctly
124 aligned for a 32 bits value. */
125 extern void *md5_read_ctx (const struct md5_ctx
*ctx
, void *resbuf
);
128 /* Compute MD5 message digest for bytes read from STREAM. The
129 resulting message digest number will be written into the 16 bytes
130 beginning at RESBLOCK. */
131 extern int md5_stream (FILE *stream
, void *resblock
);
133 /* Compute MD5 message digest for LEN bytes beginning at BUFFER. The
134 result is always in little endian byte order, so that a byte-wise
135 output yields to the wanted ASCII representation of the message
137 extern void *md5_buffer (const char *buffer
, size_t len
, void *resblock
);
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