1 /* Declaration of functions and data types used for MD5 sum computing 2 library functions. 3 Copyright (C) 1995-1997,1999,2000,2001,2004,2005 4 Free Software Foundation, Inc. 5 This file is part of the GNU C Library. 6 7 The GNU C Library is free software; you can redistribute it and/or 8 modify it under the terms of the GNU Lesser General Public 9 License as published by the Free Software Foundation; either 10 version 2.1 of the License, or (at your option) any later version. 11 12 The GNU C Library 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 GNU 15 Lesser General Public License for more details. 16 17 You should have received a copy of the GNU Lesser General Public 18 License along with the GNU C Library; if not, write to the Free 19 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 20 02111-1307 USA. */ 21 22 #ifndef _MD5_H 23 #define _MD5_H 1 24 25 #include <stdio.h> 26 27 #if defined HAVE_LIMITS_H || _LIBC 28 # include <limits.h> 29 #endif 30 31 #define MD5_DIGEST_SIZE 16 32 #define MD5_BLOCK_SIZE 64 33 34 /* The following contortions are an attempt to use the C preprocessor 35 to determine an unsigned integral type that is 32 bits wide. An 36 alternative approach is to use autoconf's AC_CHECK_SIZEOF macro, but 37 doing that would require that the configure script compile and *run* 38 the resulting executable. Locally running cross-compiled executables 39 is usually not possible. */ 40 41 #ifdef _LIBC 42 # include <stdint.h> 43 typedef uint32_t md5_uint32; 44 typedef uintptr_t md5_uintptr; 45 #else 46 # if defined __STDC__ && __STDC__ 47 # define UINT_MAX_32_BITS 4294967295U 48 # else 49 # define UINT_MAX_32_BITS 0xFFFFFFFF 50 # endif 51 52 /* If UINT_MAX isn't defined, assume it's a 32-bit type. 53 This should be valid for all systems GNU cares about because 54 that doesn't include 16-bit systems, and only modern systems 55 (that certainly have <limits.h>) have 64+-bit integral types. */ 56 57 # ifndef UINT_MAX 58 # define UINT_MAX UINT_MAX_32_BITS 59 # endif 60 61 # if UINT_MAX == UINT_MAX_32_BITS 62 typedef unsigned int md5_uint32; 63 # else 64 # if USHRT_MAX == UINT_MAX_32_BITS 65 typedef unsigned short md5_uint32; 66 # else 67 # if ULONG_MAX == UINT_MAX_32_BITS 68 typedef unsigned long md5_uint32; 69 # else 70 /* The following line is intended to evoke an error. 71 Using #error is not portable enough. */ 72 "Cannot determine unsigned 32-bit data type." 73 # endif 74 # endif 75 # endif 76 /* We have to make a guess about the integer type equivalent in size 77 to pointers which should always be correct. */ 78 typedef unsigned long int md5_uintptr; 79 #endif 80 81 /* Structure to save state of computation between the single steps. */ 82 struct md5_ctx 83 { 84 md5_uint32 A; 85 md5_uint32 B; 86 md5_uint32 C; 87 md5_uint32 D; 88 89 md5_uint32 total[2]; 90 md5_uint32 buflen; 91 char buffer[128] __attribute__ ((__aligned__ (__alignof__ (md5_uint32)))); 92 }; 93 94 /* 95 * The following three functions are build up the low level used in 96 * the functions `md5_stream' and `md5_buffer'. 97 */ 98 99 /* Initialize structure containing state of computation. 100 (RFC 1321, 3.3: Step 3) */ 101 extern void __md5_init_ctx (struct md5_ctx *ctx) __THROW; 102 103 /* Starting with the result of former calls of this function (or the 104 initialization function update the context for the next LEN bytes 105 starting at BUFFER. 106 It is necessary that LEN is a multiple of 64!!! */ 107 extern void __md5_process_block (const void *buffer, size_t len, 108 struct md5_ctx *ctx) __THROW; 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 NOT required that LEN is a multiple of 64. */ 114 extern void __md5_process_bytes (const void *buffer, size_t len, 115 struct md5_ctx *ctx) __THROW; 116 117 /* Process the remaining bytes in the buffer and put result from CTX 118 in first 16 bytes following RESBUF. The result is always in little 119 endian byte order, so that a byte-wise output yields to the wanted 120 ASCII representation of the message digest. 121 122 IMPORTANT: On some systems it is required that RESBUF is correctly 123 aligned for a 32 bits value. */ 124 extern void *__md5_finish_ctx (struct md5_ctx *ctx, void *resbuf) __THROW; 125 126 127 /* Put result from CTX in first 16 bytes following RESBUF. The result is 128 always in little endian byte order, so that a byte-wise output yields 129 to the wanted ASCII representation of the message digest. 130 131 IMPORTANT: On some systems it is required that RESBUF is correctly 132 aligned for a 32 bits value. */ 133 extern void *__md5_read_ctx (const struct md5_ctx *ctx, void *resbuf) __THROW; 134 135 136 /* Compute MD5 message digest for bytes read from STREAM. The 137 resulting message digest number will be written into the 16 bytes 138 beginning at RESBLOCK. */ 139 extern int __md5_stream (FILE *stream, void *resblock) __THROW; 140 141 /* Compute MD5 message digest for LEN bytes beginning at BUFFER. The 142 result is always in little endian byte order, so that a byte-wise 143 output yields to the wanted ASCII representation of the message 144 digest. */ 145 extern void *__md5_buffer (const char *buffer, size_t len, 146 void *resblock) __THROW; 147 148 #endif /* md5.h */ 149
