1 /* md5.h - Declaration of functions and data types used for MD5 sum 2 computing library functions. 3 Copyright (C) 1995-2016 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 #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 #elif defined (HAVE_SYS_TYPES_H) && defined (HAVE_STDINT_H) 44 #include <stdint.h> 45 #include <sys/types.h> 46 typedef uint32_t md5_uint32; 47 typedef uintptr_t md5_uintptr; 48 #else 49 # define INT_MAX_32_BITS 2147483647 50 51 /* If UINT_MAX isn't defined, assume it's a 32-bit type. 52 This should be valid for all systems GNU cares about because 53 that doesn't include 16-bit systems, and only modern systems 54 (that certainly have <limits.h>) have 64+-bit integral types. */ 55 56 # ifndef INT_MAX 57 # define INT_MAX INT_MAX_32_BITS 58 # endif 59 60 # if INT_MAX == INT_MAX_32_BITS 61 typedef unsigned int md5_uint32; 62 # else 63 # if SHRT_MAX == INT_MAX_32_BITS 64 typedef unsigned short md5_uint32; 65 # else 66 # if LONG_MAX == INT_MAX_32_BITS 67 typedef unsigned long md5_uint32; 68 # else 69 /* The following line is intended to evoke an error. 70 Using #error is not portable enough. */ 71 "Cannot determine unsigned 32-bit data type." 72 # endif 73 # endif 74 # endif 75 /* We have to make a guess about the integer type equivalent in size 76 to pointers which should always be correct. */ 77 typedef unsigned long int md5_uintptr; 78 #endif 79 80 #ifdef __cplusplus 81 extern "C" { 82 #endif 83 84 /* Structure to save state of computation between the single steps. */ 85 struct md5_ctx 86 { 87 md5_uint32 A; 88 md5_uint32 B; 89 md5_uint32 C; 90 md5_uint32 D; 91 92 md5_uint32 total[2]; 93 md5_uint32 buflen; 94 char buffer[128] ATTRIBUTE_ALIGNED_ALIGNOF(md5_uint32); 95 }; 96 97 /* 98 * The following three functions are build up the low level used in 99 * the functions `md5_stream' and `md5_buffer'. 100 */ 101 102 /* Initialize structure containing state of computation. 103 (RFC 1321, 3.3: Step 3) */ 104 extern void md5_init_ctx (struct md5_ctx *ctx); 105 106 /* Starting with the result of former calls of this function (or the 107 initialization function update the context for the next LEN bytes 108 starting at BUFFER. 109 It is necessary that LEN is a multiple of 64!!! */ 110 extern void md5_process_block (const void *buffer, size_t len, 111 struct md5_ctx *ctx); 112 113 /* Starting with the result of former calls of this function (or the 114 initialization function update the context for the next LEN bytes 115 starting at BUFFER. 116 It is NOT required that LEN is a multiple of 64. */ 117 extern void md5_process_bytes (const void *buffer, size_t len, 118 struct md5_ctx *ctx); 119 120 /* Process the remaining bytes in the buffer and put result from CTX 121 in first 16 bytes following RESBUF. The result is always in little 122 endian byte order, so that a byte-wise output yields to the wanted 123 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_finish_ctx (struct md5_ctx *ctx, void *resbuf); 128 129 130 /* Put result from CTX in first 16 bytes following RESBUF. The result is 131 always in little endian byte order, so that a byte-wise output yields 132 to the wanted ASCII representation of the message digest. 133 134 IMPORTANT: On some systems it is required that RESBUF is correctly 135 aligned for a 32 bits value. */ 136 extern void *md5_read_ctx (const struct md5_ctx *ctx, void *resbuf); 137 138 139 /* Compute MD5 message digest for bytes read from STREAM. The 140 resulting message digest number will be written into the 16 bytes 141 beginning at RESBLOCK. */ 142 extern int md5_stream (FILE *stream, void *resblock); 143 144 /* Compute MD5 message digest for LEN bytes beginning at BUFFER. The 145 result is always in little endian byte order, so that a byte-wise 146 output yields to the wanted ASCII representation of the message 147 digest. */ 148 extern void *md5_buffer (const char *buffer, size_t len, void *resblock); 149 150 #ifdef __cplusplus 151 } 152 #endif 153 154 #endif 155
