1 /* Declaration of functions and data types used for MD5 sum computing 2 library functions. 3 Copyright (C) 1995-1997, 1999-2001, 2004-2006, 2008-2010 Free Software 4 Foundation, Inc. 5 This file is part of the GNU C Library. 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 #include <stdint.h> 26 27 #define MD5_DIGEST_SIZE 16 28 #define MD5_BLOCK_SIZE 64 29 30 #ifndef __GNUC_PREREQ 31 # if defined __GNUC__ && defined __GNUC_MINOR__ 32 # define __GNUC_PREREQ(maj, min) \ 33 ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min)) 34 # else 35 # define __GNUC_PREREQ(maj, min) 0 36 # endif 37 #endif 38 39 #ifndef __THROW 40 # if defined __cplusplus && __GNUC_PREREQ (2,8) 41 # define __THROW throw () 42 # else 43 # define __THROW 44 # endif 45 #endif 46 47 #ifndef _LIBC 48 # define __md5_buffer md5_buffer 49 # define __md5_finish_ctx md5_finish_ctx 50 # define __md5_init_ctx md5_init_ctx 51 # define __md5_process_block md5_process_block 52 # define __md5_process_bytes md5_process_bytes 53 # define __md5_read_ctx md5_read_ctx 54 # define __md5_stream md5_stream 55 #endif 56 57 # ifdef __cplusplus 58 extern "C" { 59 # endif 60 61 /* Structure to save state of computation between the single steps. */ 62 struct md5_ctx 63 { 64 uint32_t A; 65 uint32_t B; 66 uint32_t C; 67 uint32_t D; 68 69 uint32_t total[2]; 70 uint32_t buflen; 71 uint32_t buffer[32]; 72 }; 73 74 /* 75 * The following three functions are build up the low level used in 76 * the functions `md5_stream' and `md5_buffer'. 77 */ 78 79 /* Initialize structure containing state of computation. 80 (RFC 1321, 3.3: Step 3) */ 81 extern void __md5_init_ctx (struct md5_ctx *ctx) __THROW; 82 83 /* Starting with the result of former calls of this function (or the 84 initialization function update the context for the next LEN bytes 85 starting at BUFFER. 86 It is necessary that LEN is a multiple of 64!!! */ 87 extern void __md5_process_block (const void *buffer, size_t len, 88 struct md5_ctx *ctx) __THROW; 89 90 /* Starting with the result of former calls of this function (or the 91 initialization function update the context for the next LEN bytes 92 starting at BUFFER. 93 It is NOT required that LEN is a multiple of 64. */ 94 extern void __md5_process_bytes (const void *buffer, size_t len, 95 struct md5_ctx *ctx) __THROW; 96 97 /* Process the remaining bytes in the buffer and put result from CTX 98 in first 16 bytes following RESBUF. The result is always in little 99 endian byte order, so that a byte-wise output yields to the wanted 100 ASCII representation of the message digest. */ 101 extern void *__md5_finish_ctx (struct md5_ctx *ctx, void *resbuf) __THROW; 102 103 104 /* Put result from CTX in first 16 bytes following RESBUF. The result is 105 always in little endian byte order, so that a byte-wise output yields 106 to the wanted ASCII representation of the message digest. */ 107 extern void *__md5_read_ctx (const struct md5_ctx *ctx, void *resbuf) __THROW; 108 109 110 /* Compute MD5 message digest for bytes read from STREAM. The 111 resulting message digest number will be written into the 16 bytes 112 beginning at RESBLOCK. */ 113 extern int __md5_stream (FILE *stream, void *resblock) __THROW; 114 115 /* Compute MD5 message digest for LEN bytes beginning at BUFFER. The 116 result is always in little endian byte order, so that a byte-wise 117 output yields to the wanted ASCII representation of the message 118 digest. */ 119 extern void *__md5_buffer (const char *buffer, size_t len, 120 void *resblock) __THROW; 121 122 # ifdef __cplusplus 123 } 124 # endif 125 126 #endif /* md5.h */ 127