1 /* md5.h - Declaration of functions and data types used for MD5 sum 2 computing library functions. 3 Copyright (C) 1995-2025 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 (at) 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 #ifdef USE_SYSTEM_MD5 25 #include_next <md5.h> 26 #else 27 28 #include <stdio.h> 29 30 #if defined HAVE_LIMITS_H || _LIBC 31 # include <limits.h> 32 #endif 33 34 #include "ansidecl.h" 35 36 /* The following contortions are an attempt to use the C preprocessor 37 to determine an unsigned integral type that is 32 bits wide. An 38 alternative approach is to use autoconf's AC_CHECK_SIZEOF macro, but 39 doing that would require that the configure script compile and *run* 40 the resulting executable. Locally running cross-compiled executables 41 is usually not possible. */ 42 43 #ifdef _LIBC 44 # include <sys/types.h> 45 typedef u_int32_t md5_uint32; 46 typedef uintptr_t md5_uintptr; 47 #elif defined (HAVE_SYS_TYPES_H) && defined (HAVE_STDINT_H) 48 #include <stdint.h> 49 #include <sys/types.h> 50 typedef uint32_t md5_uint32; 51 typedef uintptr_t md5_uintptr; 52 #else 53 # define INT_MAX_32_BITS 2147483647 54 55 /* If UINT_MAX isn't defined, assume it's a 32-bit type. 56 This should be valid for all systems GNU cares about because 57 that doesn't include 16-bit systems, and only modern systems 58 (that certainly have <limits.h>) have 64+-bit integral types. */ 59 60 # ifndef INT_MAX 61 # define INT_MAX INT_MAX_32_BITS 62 # endif 63 64 # if INT_MAX == INT_MAX_32_BITS 65 typedef unsigned int md5_uint32; 66 # else 67 # if SHRT_MAX == INT_MAX_32_BITS 68 typedef unsigned short md5_uint32; 69 # else 70 # if LONG_MAX == INT_MAX_32_BITS 71 typedef unsigned long md5_uint32; 72 # else 73 /* The following line is intended to evoke an error. 74 Using #error is not portable enough. */ 75 "Cannot determine unsigned 32-bit data type." 76 # endif 77 # endif 78 # endif 79 /* We have to make a guess about the integer type equivalent in size 80 to pointers which should always be correct. */ 81 typedef unsigned long int md5_uintptr; 82 #endif 83 84 #ifdef __cplusplus 85 extern "C" { 86 #endif 87 88 /* Structure to save state of computation between the single steps. */ 89 struct md5_ctx 90 { 91 md5_uint32 A; 92 md5_uint32 B; 93 md5_uint32 C; 94 md5_uint32 D; 95 96 md5_uint32 total[2]; 97 md5_uint32 buflen; 98 char buffer[128] ATTRIBUTE_ALIGNED_ALIGNOF(md5_uint32); 99 }; 100 101 /* 102 * The following three functions are build up the low level used in 103 * the functions `md5_stream' and `md5_buffer'. 104 */ 105 106 /* Initialize structure containing state of computation. 107 (RFC 1321, 3.3: Step 3) */ 108 extern void md5_init_ctx (struct md5_ctx *ctx); 109 110 /* Starting with the result of former calls of this function (or the 111 initialization function update the context for the next LEN bytes 112 starting at BUFFER. 113 It is necessary that LEN is a multiple of 64!!! */ 114 extern void md5_process_block (const void *buffer, size_t len, 115 struct md5_ctx *ctx); 116 117 /* Starting with the result of former calls of this function (or the 118 initialization function update the context for the next LEN bytes 119 starting at BUFFER. 120 It is NOT required that LEN is a multiple of 64. */ 121 extern void md5_process_bytes (const void *buffer, size_t len, 122 struct md5_ctx *ctx); 123 124 /* Process the remaining bytes in the buffer and put result from CTX 125 in first 16 bytes following RESBUF. The result is always in little 126 endian byte order, so that a byte-wise output yields to the wanted 127 ASCII representation of the message digest. 128 129 IMPORTANT: On some systems it is required that RESBUF is correctly 130 aligned for a 32 bits value. */ 131 extern void *md5_finish_ctx (struct md5_ctx *ctx, void *resbuf); 132 133 134 /* Put result from CTX in first 16 bytes following RESBUF. The result is 135 always in little endian byte order, so that a byte-wise output yields 136 to the wanted ASCII representation of the message digest. 137 138 IMPORTANT: On some systems it is required that RESBUF is correctly 139 aligned for a 32 bits value. */ 140 extern void *md5_read_ctx (const struct md5_ctx *ctx, void *resbuf); 141 142 143 /* Compute MD5 message digest for bytes read from STREAM. The 144 resulting message digest number will be written into the 16 bytes 145 beginning at RESBLOCK. */ 146 extern int md5_stream (FILE *stream, void *resblock); 147 148 /* Compute MD5 message digest for LEN bytes beginning at BUFFER. The 149 result is always in little endian byte order, so that a byte-wise 150 output yields to the wanted ASCII representation of the message 151 digest. */ 152 extern void *md5_buffer (const char *buffer, size_t len, void *resblock); 153 154 #ifdef __cplusplus 155 } 156 #endif 157 158 #endif // USE_SYSTEM_MD5 159 160 #endif 161
Indexes created Tue Feb 24 01:34:59 UTC 2026