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. 6 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 10 later version. 11 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. 16 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ 20 21 #ifndef _MD5_H 22 #define _MD5_H 1 23 24 #include <stdio.h> 25 26 #if defined HAVE_LIMITS_H || _LIBC 27 # include <limits.h> 28 #endif 29 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. */ 36 37 #ifdef _LIBC 38 # include <sys/types.h> 39 typedef u_int32_t md5_uint32; 40 #else 41 # define INT_MAX_32_BITS 2147483647 42 43 /* If UINT_MAX isn't defined, assume it's a 32-bit type. 44 This should be valid for all systems GNU cares about because 45 that doesn't include 16-bit systems, and only modern systems 46 (that certainly have <limits.h>) have 64+-bit integral types. */ 47 48 # ifndef INT_MAX 49 # define INT_MAX INT_MAX_32_BITS 50 # endif 51 52 # if INT_MAX == INT_MAX_32_BITS 53 typedef unsigned int md5_uint32; 54 # else 55 # if SHRT_MAX == INT_MAX_32_BITS 56 typedef unsigned short md5_uint32; 57 # else 58 # if LONG_MAX == INT_MAX_32_BITS 59 typedef unsigned long md5_uint32; 60 # else 61 /* The following line is intended to evoke an error. 62 Using #error is not portable enough. */ 63 "Cannot determine unsigned 32-bit data type." 64 # endif 65 # endif 66 # endif 67 #endif 68 69 #undef __P 70 #if defined (__STDC__) && __STDC__ 71 #define __P(x) x 72 #else 73 #define __P(x) () 74 #endif 75 76 /* Structure to save state of computation between the single steps. */ 77 struct md5_ctx 78 { 79 md5_uint32 A; 80 md5_uint32 B; 81 md5_uint32 C; 82 md5_uint32 D; 83 84 md5_uint32 total[2]; 85 md5_uint32 buflen; 86 char buffer[128]; 87 }; 88 89 /* 90 * The following three functions are build up the low level used in 91 * the functions `md5_stream' and `md5_buffer'. 92 */ 93 94 /* Initialize structure containing state of computation. 95 (RFC 1321, 3.3: Step 3) */ 96 extern void md5_init_ctx __P ((struct md5_ctx *ctx)); 97 98 /* Starting with the result of former calls of this function (or the 99 initialization function update the context for the next LEN bytes 100 starting at BUFFER. 101 It is necessary that LEN is a multiple of 64!!! */ 102 extern void md5_process_block __P ((const void *buffer, size_t len, 103 struct md5_ctx *ctx)); 104 105 /* Starting with the result of former calls of this function (or the 106 initialization function update the context for the next LEN bytes 107 starting at BUFFER. 108 It is NOT required that LEN is a multiple of 64. */ 109 extern void md5_process_bytes __P ((const void *buffer, size_t len, 110 struct md5_ctx *ctx)); 111 112 /* Process the remaining bytes in the buffer and put result from CTX 113 in first 16 bytes following RESBUF. The result is always in little 114 endian byte order, so that a byte-wise output yields to the wanted 115 ASCII representation of the message digest. 116 117 IMPORTANT: On some systems it is required that RESBUF is correctly 118 aligned for a 32 bits value. */ 119 extern void *md5_finish_ctx __P ((struct md5_ctx *ctx, void *resbuf)); 120 121 122 /* Put result from CTX in first 16 bytes following RESBUF. The result is 123 always in little endian byte order, so that a byte-wise output yields 124 to the wanted ASCII representation of the message digest. 125 126 IMPORTANT: On some systems it is required that RESBUF is correctly 127 aligned for a 32 bits value. */ 128 extern void *md5_read_ctx __P ((const struct md5_ctx *ctx, void *resbuf)); 129 130 131 /* Compute MD5 message digest for bytes read from STREAM. The 132 resulting message digest number will be written into the 16 bytes 133 beginning at RESBLOCK. */ 134 extern int md5_stream __P ((FILE *stream, void *resblock)); 135 136 /* Compute MD5 message digest for LEN bytes beginning at BUFFER. The 137 result is always in little endian byte order, so that a byte-wise 138 output yields to the wanted ASCII representation of the message 139 digest. */ 140 extern void *md5_buffer __P ((const char *buffer, size_t len, void *resblock)); 141 142 #endif 143