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 This file is part of the GNU C Library.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Library General Public License as
8 published by the Free Software Foundation; either version 2 of the
9 License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Library General Public License for more details.
16 You should have received a copy of the GNU Library General Public
17 License along with the GNU C Library; see the file COPYING.LIB. If
18 not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 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 # if defined __STDC__ && __STDC__
42 # define UINT_MAX_32_BITS 4294967295U
44 # define UINT_MAX_32_BITS 0xFFFFFFFF
47 /* If UINT_MAX isn't defined, assume it's a 32-bit type.
48 This should be valid for all systems GNU cares about because
49 that doesn't include 16-bit systems, and only modern systems
50 (that certainly have <limits.h>) have 64+-bit integral types. */
53 # define UINT_MAX UINT_MAX_32_BITS
56 # if UINT_MAX == UINT_MAX_32_BITS
57 typedef unsigned int md5_uint32;
59 # if USHRT_MAX == UINT_MAX_32_BITS
60 typedef unsigned short md5_uint32;
62 # if ULONG_MAX == UINT_MAX_32_BITS
63 typedef unsigned long md5_uint32;
65 /* The following line is intended to evoke an error.
66 Using #error is not portable enough. */
67 "Cannot determine unsigned 32-bit data type."
74 #if defined (__STDC__) && __STDC__
80 /* Structure to save state of computation between the single steps. */
94 * The following three functions are build up the low level used in
95 * the functions `md5_stream' and `md5_buffer'.
98 /* Initialize structure containing state of computation.
99 (RFC 1321, 3.3: Step 3) */
100 void md5_init_ctx __P ((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 necessary that LEN is a multiple of 64!!! */
106 void md5_process_block __P ((const void *buffer, size_t len,
107 struct md5_ctx *ctx));
109 /* Starting with the result of former calls of this function (or the
110 initialization function update the context for the next LEN bytes
112 It is NOT required that LEN is a multiple of 64. */
113 void md5_process_bytes __P ((const void *buffer, size_t len,
114 struct md5_ctx *ctx));
116 /* Process the remaining bytes in the buffer and put result from CTX
117 in first 16 bytes following RESBUF. The result is always in little
118 endian byte order, so that a byte-wise output yields to the wanted
119 ASCII representation of the message digest. */
120 void *md5_finish_ctx __P ((struct md5_ctx *ctx, void *resbuf));
123 /* Put result from CTX in first 16 bytes following RESBUF. The result is
124 always in little endian byte order, so that a byte-wise output yields
125 to the wanted ASCII representation of the message digest. */
126 void *md5_read_ctx __P ((const struct md5_ctx *ctx, void *resbuf));
129 /* Compute MD5 message digest for bytes read from STREAM. The
130 resulting message digest number will be written into the 16 bytes
131 beginning at RESBLOCK. */
132 int md5_stream __P ((FILE *stream, void *resblock));
134 /* Compute MD5 message digest for LEN bytes beginning at BUFFER. The
135 result is always in little endian byte order, so that a byte-wise
136 output yields to the wanted ASCII representation of the message
138 void *md5_buffer __P ((const char *buffer, size_t len, void *resblock));