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[glibc.git] / md5-crypt / md5.h
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1 /* Declaration of functions and data types used for MD5 sum computing
2 library functions.
3 Copyright (C) 1995, 1996, 1997, 1999 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 not,
18 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
21 #ifndef _MD5_H
22 #define _MD5_H 1
24 #include <stdio.h>
26 #if defined HAVE_LIMITS_H || _LIBC
27 # include <limits.h>
28 #endif
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. */
37 #ifdef _LIBC
38 # include <sys/types.h>
39 typedef u_int32_t md5_uint32;
40 #else
41 # if defined __STDC__ && __STDC__
42 # define UINT_MAX_32_BITS 4294967295U
43 # else
44 # define UINT_MAX_32_BITS 0xFFFFFFFF
45 # endif
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. */
52 # ifndef UINT_MAX
53 # define UINT_MAX UINT_MAX_32_BITS
54 # endif
56 # if UINT_MAX == UINT_MAX_32_BITS
57 typedef unsigned int md5_uint32;
58 # else
59 # if USHRT_MAX == UINT_MAX_32_BITS
60 typedef unsigned short md5_uint32;
61 # else
62 # if ULONG_MAX == UINT_MAX_32_BITS
63 typedef unsigned long md5_uint32;
64 # else
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."
68 # endif
69 # endif
70 # endif
71 #endif
73 #undef __P
74 #if defined (__STDC__) && __STDC__
75 # define __P(x) x
76 #else
77 # define __P(x) ()
78 #endif
80 /* Structure to save state of computation between the single steps. */
81 struct md5_ctx
83 md5_uint32 A;
84 md5_uint32 B;
85 md5_uint32 C;
86 md5_uint32 D;
88 md5_uint32 total[2];
89 md5_uint32 buflen;
90 char buffer[128];
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 extern 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
104 starting at BUFFER.
105 It is necessary that LEN is a multiple of 64!!! */
106 extern 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
111 starting at BUFFER.
112 It is NOT required that LEN is a multiple of 64. */
113 extern 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.
121 IMPORTANT: On some systems it is required that RESBUF is correctly
122 aligned for a 32 bits value. */
123 extern void *__md5_finish_ctx __P ((struct md5_ctx *ctx, void *resbuf));
126 /* Put result from CTX in first 16 bytes following RESBUF. The result is
127 always in little endian byte order, so that a byte-wise output yields
128 to the wanted ASCII representation of the message digest.
130 IMPORTANT: On some systems it is required that RESBUF is correctly
131 aligned for a 32 bits value. */
132 extern void *__md5_read_ctx __P ((const struct md5_ctx *ctx, void *resbuf));
135 /* Compute MD5 message digest for bytes read from STREAM. The
136 resulting message digest number will be written into the 16 bytes
137 beginning at RESBLOCK. */
138 extern int __md5_stream __P ((FILE *stream, void *resblock));
140 /* Compute MD5 message digest for LEN bytes beginning at BUFFER. The
141 result is always in little endian byte order, so that a byte-wise
142 output yields to the wanted ASCII representation of the message
143 digest. */
144 extern void *__md5_buffer __P ((const char *buffer, size_t len,
145 void *resblock));
147 #endif /* md5.h */