1 /* Declaration of functions and data types used for MD5 sum computing 2 library functions. 3 Copyright (C) 1995,1996,1997,1999,2000,2001 Free Software Foundation, Inc. 4 This file is part of the GNU C Library. 5 6 The GNU C Library is free software; you can redistribute it and/or 7 modify it under the terms of the GNU Lesser General Public 8 License as published by the Free Software Foundation; either 9 version 2.1 of the License, or (at your option) any later version. 10 11 The GNU C Library is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 Lesser General Public License for more details. 15 16 You should have received a copy of the GNU Lesser General Public 17 License along with the GNU C Library. 18 If not, see <https://www.gnu.org/licenses/>. */ 19 20 #ifndef _MD5_H 21 #define _MD5_H 1 22 23 #include <stdio.h> 24 25 #if defined HAVE_LIMITS_H || _LIBC 26 # include <limits.h> 27 #endif 28 29 /* The following contortions are an attempt to use the C preprocessor 30 to determine an unsigned integral type that is 32 bits wide. An 31 alternative approach is to use autoconf's AC_CHECK_SIZEOF macro, but 32 doing that would require that the configure script compile and *run* 33 the resulting executable. Locally running cross-compiled executables 34 is usually not possible. */ 35 36 #ifdef _LIBC 37 # include <stdint.h> 38 typedef uint32_t md5_uint32; 39 typedef uintptr_t md5_uintptr; 40 #else 41 # if defined __STDC__ && __STDC__ 42 # define UINT_MAX_32_BITS 4294967295U 43 # else 44 # define UINT_MAX_32_BITS 0xFFFFFFFF 45 # endif 46 47 /* If UINT_MAX isn't defined, assume it's a 32-bit type. 48 This should be valid for all systems GNU cares about because 49 that doesn't include 16-bit systems, and only modern systems 50 (that certainly have <limits.h>) have 64+-bit integral types. */ 51 52 # ifndef UINT_MAX 53 # define UINT_MAX UINT_MAX_32_BITS 54 # endif 55 56 # if UINT_MAX == UINT_MAX_32_BITS 57 typedef unsigned int md5_uint32; 58 # else 59 # if USHRT_MAX == UINT_MAX_32_BITS 60 typedef unsigned short md5_uint32; 61 # else 62 # if ULONG_MAX == UINT_MAX_32_BITS 63 typedef unsigned long md5_uint32; 64 # else 65 /* The following line is intended to evoke an error. 66 Using #error is not portable enough. */ 67 "Cannot determine unsigned 32-bit data type." 68 # endif 69 # endif 70 # endif 71 /* We have to make a guess about the integer type equivalent in size 72 to pointers which should always be correct. */ 73 typedef unsigned long int md5_uintptr; 74 #endif 75 76 #undef __P 77 #if defined (__STDC__) && __STDC__ 78 # define __P(x) x 79 #else 80 # define __P(x) () 81 #endif 82 83 #define __md5_buffer md5_buffer 84 85 #if defined __GNUC__ 86 #define ALIGN __attribute__ ((__aligned__ (4))) 87 #else 88 #define ALIGN 89 #endif 90 91 /* Structure to save state of computation between the single steps. */ 92 struct md5_ctx 93 { 94 md5_uint32 A; 95 md5_uint32 B; 96 md5_uint32 C; 97 md5_uint32 D; 98 99 md5_uint32 total[2]; 100 md5_uint32 buflen; 101 char buffer[128] ALIGN; 102 }; 103 104 /* 105 * The following three functions are build up the low level used in 106 * the functions `md5_stream' and `md5_buffer'. 107 */ 108 109 /* Initialize structure containing state of computation. 110 (RFC 1321, 3.3: Step 3) */ 111 extern void __md5_init_ctx __P ((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 necessary that LEN is a multiple of 64!!! */ 117 extern void __md5_process_block __P ((const void *buffer, size_t len, 118 struct md5_ctx *ctx)); 119 120 /* Starting with the result of former calls of this function (or the 121 initialization function update the context for the next LEN bytes 122 starting at BUFFER. 123 It is NOT required that LEN is a multiple of 64. */ 124 extern void __md5_process_bytes __P ((const void *buffer, size_t len, 125 struct md5_ctx *ctx)); 126 127 /* Process the remaining bytes in the buffer and put result from CTX 128 in first 16 bytes following RESBUF. The result is always in little 129 endian byte order, so that a byte-wise output yields to the wanted 130 ASCII representation of the message digest. 131 132 IMPORTANT: On some systems it is required that RESBUF is correctly 133 aligned for a 32 bits value. */ 134 extern void *__md5_finish_ctx __P ((struct md5_ctx *ctx, void *resbuf)); 135 136 137 /* Put result from CTX in first 16 bytes following RESBUF. The result is 138 always in little endian byte order, so that a byte-wise output yields 139 to the wanted ASCII representation of the message digest. 140 141 IMPORTANT: On some systems it is required that RESBUF is correctly 142 aligned for a 32 bits value. */ 143 extern void *__md5_read_ctx __P ((const struct md5_ctx *ctx, void *resbuf)); 144 145 146 /* Compute MD5 message digest for bytes read from STREAM. The 147 resulting message digest number will be written into the 16 bytes 148 beginning at RESBLOCK. */ 149 extern int __md5_stream __P ((FILE *stream, void *resblock)); 150 151 /* Compute MD5 message digest for LEN bytes beginning at BUFFER. The 152 result is always in little endian byte order, so that a byte-wise 153 output yields to the wanted ASCII representation of the message 154 digest. */ 155 extern void *__md5_buffer __P ((const char *buffer, size_t len, 156 void *resblock)); 157 158 #endif /* md5.h */ 159