1 /* Declaration of functions and data types used for MD5 sum computing 2 library functions. 3 Copyright (C) 1995-1997,1999-2005 Free Software Foundation, Inc. 4 5 NOTE: The canonical source of this file is maintained with the GNU C 6 Library. Bugs can be reported to bug-glibc@prep.ai.mit.edu. 7 8 This program is free software; you can redistribute it and/or modify it 9 under the terms of the GNU General Public License as published by the 10 Free Software Foundation; either version 2, or (at your option) any 11 later version. 12 13 This program is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with this program; if not, write to the Free Software Foundation, 20 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ 21 22 #ifndef _MD5_H 23 #define _MD5_H 1 24 25 #include <stdio.h> 26 27 #if HAVE_INTTYPES_H 28 # include <inttypes.h> 29 #endif 30 #if HAVE_STDINT_H || _LIBC 31 # include <stdint.h> 32 #endif 33 34 #ifndef __GNUC_PREREQ 35 # if defined __GNUC__ && defined __GNUC_MINOR__ 36 # define __GNUC_PREREQ(maj, min) \ 37 ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min)) 38 # else 39 # define __GNUC_PREREQ(maj, min) 0 40 # endif 41 #endif 42 43 #ifndef __THROW 44 # if defined __cplusplus && __GNUC_PREREQ (2,8) 45 # define __THROW throw () 46 # else 47 # define __THROW 48 # endif 49 #endif 50 51 #ifndef __attribute__ 52 # if ! __GNUC_PREREQ (2,8) || __STRICT_ANSI__ 53 # define __attribute__(x) 54 # endif 55 #endif 56 57 #ifndef _LIBC 58 # define __md5_buffer md5_buffer 59 # define __md5_finish_ctx md5_finish_ctx 60 # define __md5_init_ctx md5_init_ctx 61 # define __md5_process_block md5_process_block 62 # define __md5_process_bytes md5_process_bytes 63 # define __md5_read_ctx md5_read_ctx 64 # define __md5_stream md5_stream 65 #endif 66 67 typedef uint32_t md5_uint32; 68 69 /* Structure to save state of computation between the single steps. */ 70 struct md5_ctx 71 { 72 md5_uint32 A; 73 md5_uint32 B; 74 md5_uint32 C; 75 md5_uint32 D; 76 77 md5_uint32 total[2]; 78 md5_uint32 buflen; 79 char buffer[128] __attribute__ ((__aligned__ (__alignof__ (md5_uint32)))); 80 }; 81 82 /* 83 * The following three functions are build up the low level used in 84 * the functions `md5_stream' and `md5_buffer'. 85 */ 86 87 /* Initialize structure containing state of computation. 88 (RFC 1321, 3.3: Step 3) */ 89 extern void __md5_init_ctx (struct md5_ctx *ctx) __THROW; 90 91 /* Starting with the result of former calls of this function (or the 92 initialization function update the context for the next LEN bytes 93 starting at BUFFER. 94 It is necessary that LEN is a multiple of 64!!! */ 95 extern void __md5_process_block (const void *buffer, size_t len, 96 struct md5_ctx *ctx) __THROW; 97 98 /* Starting with the result of former calls of this function (or the 99 initialization function update the context for the next LEN bytes 100 starting at BUFFER. 101 It is NOT required that LEN is a multiple of 64. */ 102 extern void __md5_process_bytes (const void *buffer, size_t len, 103 struct md5_ctx *ctx) __THROW; 104 105 /* Process the remaining bytes in the buffer and put result from CTX 106 in first 16 bytes following RESBUF. The result is always in little 107 endian byte order, so that a byte-wise output yields to the wanted 108 ASCII representation of the message digest. 109 110 IMPORTANT: On some systems it is required that RESBUF be correctly 111 aligned for a 32 bits value. */ 112 extern void *__md5_finish_ctx (struct md5_ctx *ctx, void *resbuf) __THROW; 113 114 115 /* Put result from CTX in first 16 bytes following RESBUF. The result is 116 always in little endian byte order, so that a byte-wise output yields 117 to the wanted ASCII representation of the message digest. 118 119 IMPORTANT: On some systems it is required that RESBUF is correctly 120 aligned for a 32 bits value. */ 121 extern void *__md5_read_ctx (const struct md5_ctx *ctx, void *resbuf) __THROW; 122 123 124 /* Compute MD5 message digest for bytes read from STREAM. The 125 resulting message digest number will be written into the 16 bytes 126 beginning at RESBLOCK. */ 127 extern int __md5_stream (FILE *stream, void *resblock) __THROW; 128 129 /* Compute MD5 message digest for LEN bytes beginning at BUFFER. The 130 result is always in little endian byte order, so that a byte-wise 131 output yields to the wanted ASCII representation of the message 132 digest. */ 133 extern void *__md5_buffer (const char *buffer, size_t len, 134 void *resblock) __THROW; 135 136 #endif /* md5.h */ 137