00001 /* md5.h - Declaration of functions and data types used for MD5 sum 00002 computing library functions. 00003 Copyright (C) 1995, 1996 Free Software Foundation, Inc. 00004 NOTE: The canonical source of this file is maintained with the GNU C 00005 Library. Bugs can be reported to bug-glibc@prep.ai.mit.edu. 00006 00007 This program is free software; you can redistribute it and/or modify it 00008 under the terms of the GNU General Public License as published by the 00009 Free Software Foundation; either version 2, or (at your option) any 00010 later version. 00011 00012 This program is distributed in the hope that it will be useful, 00013 but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00015 GNU General Public License for more details. 00016 00017 You should have received a copy of the GNU General Public License 00018 along with this program; if not, write to the Free Software Foundation, 00019 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ 00020 00021 #ifndef _MD5_H 00022 #define _MD5_H 1 00023 00024 #include <stddef.h> 00025 #include <stdio.h> 00026 00027 #if defined HAVE_LIMITS_H || _LIBC 00028 # include <limits.h> 00029 #endif 00030 00031 /* The following contortions are an attempt to use the C preprocessor 00032 to determine an unsigned integral type that is 32 bits wide. An 00033 alternative approach is to use autoconf's AC_CHECK_SIZEOF macro, but 00034 doing that would require that the configure script compile and *run* 00035 the resulting executable. Locally running cross-compiled executables 00036 is usually not possible. */ 00037 00038 #ifdef _LIBC 00039 # include <sys/types.h> 00040 typedef u_int32_t md5_uint32; 00041 #else 00042 # if defined __STDC__ && __STDC__ 00043 # define UINT_MAX_32_BITS 4294967295U 00044 # else 00045 # define UINT_MAX_32_BITS 0xFFFFFFFF 00046 # endif 00047 00048 /* If UINT_MAX isn't defined, assume it's a 32-bit type. 00049 This should be valid for all systems GNU cares about because 00050 that doesn't include 16-bit systems, and only modern systems 00051 (that certainly have <limits.h>) have 64+-bit integral types. */ 00052 00053 # ifndef UINT_MAX 00054 # define UINT_MAX UINT_MAX_32_BITS 00055 # endif 00056 00057 # if UINT_MAX == UINT_MAX_32_BITS 00058 typedef unsigned int md5_uint32; 00059 # else 00060 # if USHRT_MAX == UINT_MAX_32_BITS 00061 typedef unsigned short md5_uint32; 00062 # else 00063 # if ULONG_MAX == UINT_MAX_32_BITS 00064 typedef unsigned long md5_uint32; 00065 # else 00066 /* The following line is intended to evoke an error. 00067 Using #error is not portable enough. */ 00068 "Cannot determine unsigned 32-bit data type." 00069 # endif 00070 # endif 00071 # endif 00072 #endif 00073 00074 #undef __P 00075 #if defined (__STDC__) && __STDC__ 00076 #define __P(x) x 00077 #else 00078 #define __P(x) () 00079 #endif 00080 00081 /* Structure to save state of computation between the single steps. */ 00082 struct md5_ctx 00083 { 00084 md5_uint32 A; 00085 md5_uint32 B; 00086 md5_uint32 C; 00087 md5_uint32 D; 00088 00089 md5_uint32 total[2]; 00090 md5_uint32 buflen; 00091 char buffer[128]; 00092 }; 00093 00094 /* 00095 * The following three functions are build up the low level used in 00096 * the functions `md5_stream' and `md5_buffer'. 00097 */ 00098 00099 /* Initialize structure containing state of computation. 00100 (RFC 1321, 3.3: Step 3) */ 00101 extern void md5_init_ctx __P ((struct md5_ctx *ctx)); 00102 00103 00104 /* Starting with the result of former calls of this function (or the 00105 initialization function update the context for the next LEN bytes 00106 starting at BUFFER. 00107 00108 It is necessary that LEN is a multiple of 64!!! 00109 00110 IMPORTANT: On some systems it is required that buffer be 32-bit 00111 aligned. */ 00112 extern void md5_process_block __P ((const void *buffer, size_t len, 00113 struct md5_ctx *ctx)); 00114 00115 /* Starting with the result of former calls of this function (or the 00116 initialization function) update the context for the next LEN bytes 00117 starting at BUFFER. 00118 00119 It is NOT required that LEN is a multiple of 64. 00120 00121 IMPORTANT: On some systems it is required that buffer be 32-bit 00122 aligned. */ 00123 extern void md5_process_bytes __P ((const void *buffer, size_t len, 00124 struct md5_ctx *ctx)); 00125 00126 /* Process the remaining bytes in the buffer and put result from CTX 00127 in first 16 bytes following RESBUF. The result is always in little 00128 endian byte order, so that a byte-wise output yields to the wanted 00129 ASCII representation of the message digest. 00130 00131 IMPORTANT: On some systems it is required that RESBUF be correctly 00132 aligned for a 32 bits value. */ 00133 extern void *md5_finish_ctx __P ((struct md5_ctx *ctx, void *resbuf)); 00134 00135 00136 /* Put result from CTX in first 16 bytes following RESBUF. The result is 00137 always in little endian byte order, so that a byte-wise output yields 00138 to the wanted ASCII representation of the message digest. 00139 00140 IMPORTANT: On some systems it is required that RESBUF be correctly 00141 aligned for a 32 bits value. */ 00142 extern void *md5_read_ctx __P ((const struct md5_ctx *ctx, void *resbuf)); 00143 00144 00145 /* Compute MD5 message digest for bytes read from STREAM. The 00146 resulting message digest number will be written into the 16 bytes 00147 beginning at RESBLOCK. 00148 00149 IMPORTANT: On some systems it is required that resblock be 32-bit 00150 aligned. */ 00151 extern int md5_stream __P ((FILE *stream, void *resblock)); 00152 00153 00154 /* Compute MD5 message digest for LEN bytes beginning at BUFFER. The 00155 result is always in little endian byte order, so that a byte-wise 00156 output yields to the wanted ASCII representation of the message 00157 digest. 00158 00159 IMPORTANT: On some systems it is required that buffer and resblock 00160 be correctly 32-bit aligned. */ 00161 extern void *md5_buffer __P ((const char *buffer, size_t len, void *resblock)); 00162 00163 #endif