1 /* md5.h - Declaration of functions and data types used for MD5 sum
2 computing library functions.
3 Copyright (C) 1995, 1996 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 3, 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, see <http://www.gnu.org/licenses/>. */
25 /* The following contortions are an attempt to use the C preprocessor
26 to determine an unsigned integral type that is 32 bits wide. An
27 alternative approach is to use autoconf's AC_CHECK_SIZEOF macro, but
28 doing that would require that the configure script compile and *run*
29 the resulting executable. Locally running cross-compiled executables
30 is usually not possible. */
33 # include <sys/types.h>
34 typedef u_int32_t md5_uint32;
36 # if defined __STDC__ && __STDC__
37 # define UINT_MAX_32_BITS 4294967295U
39 # define UINT_MAX_32_BITS 0xFFFFFFFF
42 /* If UINT_MAX isn't defined, assume it's a 32-bit type.
43 This should be valid for all systems GNU cares about because
44 that doesn't include 16-bit systems, and only modern systems
45 (that certainly have <limits.h>) have 64+-bit integral types. */
48 # define UINT_MAX UINT_MAX_32_BITS
51 # if UINT_MAX == UINT_MAX_32_BITS
52 typedef unsigned int md5_uint32;
54 # if USHRT_MAX == UINT_MAX_32_BITS
55 typedef unsigned short md5_uint32;
57 # if ULONG_MAX == UINT_MAX_32_BITS
58 typedef unsigned long md5_uint32;
60 /* The following line is intended to evoke an error.
61 Using #error is not portable enough. */
62 "Cannot determine unsigned 32-bit data type."
68 /* Structure to save state of computation between the single steps. */
82 * The following three functions are build up the low level used in
83 * the functions `md5_stream' and `md5_buffer'.
86 /* Initialize structure containing state of computation.
87 (RFC 1321, 3.3: Step 3) */
88 extern void md5_init_ctx (struct md5_ctx *ctx);
90 /* Starting with the result of former calls of this function (or the
91 initialization function update the context for the next LEN bytes
93 It is necessary that LEN is a multiple of 64!!! */
94 extern void md5_process_block (const void *buffer, size_t len,
97 /* Starting with the result of former calls of this function (or the
98 initialization function update the context for the next LEN bytes
100 It is NOT required that LEN is a multiple of 64. */
101 extern void md5_process_bytes (const void *buffer, size_t len,
102 struct md5_ctx *ctx);
104 /* Process the remaining bytes in the buffer and put result from CTX
105 in first 16 bytes following RESBUF. The result is always in little
106 endian byte order, so that a byte-wise output yields to the wanted
107 ASCII representation of the message digest.
109 IMPORTANT: On some systems it is required that RESBUF is correctly
110 aligned for a 32 bits value. */
111 extern void *md5_finish_ctx (struct md5_ctx *ctx, void *resbuf);
114 /* Put result from CTX in first 16 bytes following RESBUF. The result is
115 always in little endian byte order, so that a byte-wise output yields
116 to the wanted ASCII representation of the message digest.
118 IMPORTANT: On some systems it is required that RESBUF is correctly
119 aligned for a 32 bits value. */
120 extern void *md5_read_ctx (const struct md5_ctx *ctx, void *resbuf);
123 #if 0 /* Unused in Wget */
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. */
127 extern int md5_stream (FILE *stream, void *resblock);
130 /* Compute MD5 message digest for LEN bytes beginning at BUFFER. The
131 result is always in little endian byte order, so that a byte-wise
132 output yields to the wanted ASCII representation of the message
134 extern void *md5_buffer (const char *buffer, size_t len, void *resblock);