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., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, 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 #include "ansidecl.h" 31 32 /* The following contortions are an attempt to use the C preprocessor 33 to determine an unsigned integral type that is 32 bits wide. An 34 alternative approach is to use autoconf's AC_CHECK_SIZEOF macro, but 35 doing that would require that the configure script compile and *run* 36 the resulting executable. Locally running cross-compiled executables 37 is usually not possible. */ 38 39 #ifdef _LIBC 40 # include <sys/types.h> 41 typedef u_int32_t md5_uint32; 42 typedef uintptr_t md5_uintptr; 43 #else 44 # define INT_MAX_32_BITS 2147483647 45 46 /* If UINT_MAX isn't defined, assume it's a 32-bit type. 47 This should be valid for all systems GNU cares about because 48 that doesn't include 16-bit systems, and only modern systems 49 (that certainly have <limits.h>) have 64+-bit integral types. */ 50 51 # ifndef INT_MAX 52 # define INT_MAX INT_MAX_32_BITS 53 # endif 54 55 # if INT_MAX == INT_MAX_32_BITS 56 typedef unsigned int md5_uint32; 57 # else 58 # if SHRT_MAX == INT_MAX_32_BITS 59 typedef unsigned short md5_uint32; 60 # else 61 # if LONG_MAX == INT_MAX_32_BITS 62 typedef unsigned long md5_uint32; 63 # else 64 /* The following line is intended to evoke an error. 65 Using #error is not portable enough. */ 66 "Cannot determine unsigned 32-bit data type." 67 # endif 68 # endif 69 # endif 70 /* We have to make a guess about the integer type equivalent in size 71 to pointers which should always be correct. */ 72 typedef unsigned long int md5_uintptr; 73 #endif 74 75 /* Structure to save state of computation between the single steps. */ 76 struct md5_ctx 77 { 78 md5_uint32 A; 79 md5_uint32 B; 80 md5_uint32 C; 81 md5_uint32 D; 82 83 md5_uint32 total[2]; 84 md5_uint32 buflen; 85 char buffer[128] ATTRIBUTE_ALIGNED_ALIGNOF(md5_uint32); 86 }; 87 88 /* 89 * The following three functions are build up the low level used in 90 * the functions `md5_stream' and `md5_buffer'. 91 */ 92 93 /* Initialize structure containing state of computation. 94 (RFC 1321, 3.3: Step 3) */ 95 extern void md5_init_ctx (struct md5_ctx *ctx); 96 97 /* Starting with the result of former calls of this function (or the 98 initialization function update the context for the next LEN bytes 99 starting at BUFFER. 100 It is necessary that LEN is a multiple of 64!!! */ 101 extern void md5_process_block (const void *buffer, size_t len, 102 struct md5_ctx *ctx); 103 104 /* Starting with the result of former calls of this function (or the 105 initialization function update the context for the next LEN bytes 106 starting at BUFFER. 107 It is NOT required that LEN is a multiple of 64. */ 108 extern void md5_process_bytes (const void *buffer, size_t len, 109 struct md5_ctx *ctx); 110 111 /* Process the remaining bytes in the buffer and put result from CTX 112 in first 16 bytes following RESBUF. The result is always in little 113 endian byte order, so that a byte-wise output yields to the wanted 114 ASCII representation of the message digest. 115 116 IMPORTANT: On some systems it is required that RESBUF is correctly 117 aligned for a 32 bits value. */ 118 extern void *md5_finish_ctx (struct md5_ctx *ctx, void *resbuf); 119 120 121 /* Put result from CTX in first 16 bytes following RESBUF. The result is 122 always in little endian byte order, so that a byte-wise output yields 123 to the wanted ASCII representation of the message digest. 124 125 IMPORTANT: On some systems it is required that RESBUF is correctly 126 aligned for a 32 bits value. */ 127 extern void *md5_read_ctx (const struct md5_ctx *ctx, void *resbuf); 128 129 130 /* Compute MD5 message digest for bytes read from STREAM. The 131 resulting message digest number will be written into the 16 bytes 132 beginning at RESBLOCK. */ 133 extern int md5_stream (FILE *stream, void *resblock); 134 135 /* Compute MD5 message digest for LEN bytes beginning at BUFFER. The 136 result is always in little endian byte order, so that a byte-wise 137 output yields to the wanted ASCII representation of the message 138 digest. */ 139 extern void *md5_buffer (const char *buffer, size_t len, void *resblock); 140 141 #endif 142