1 /* md5.h - Declaration of functions and data types used for MD5 sum 2 computing library functions. 3 Copyright (C) 1995, 1996, 1999 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@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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ 20 21 #ifndef _MD5_H 22 #define _MD5_H 1 23 24 #include <stdio.h> 25 26 #include "types.h" 27 28 #undef __P 29 #if defined (__STDC__) && __STDC__ 30 #define __P(x) x 31 #else 32 #define __P(x) () 33 #endif 34 35 /* Structure to save state of computation between the single steps. */ 36 struct md5_ctx 37 { 38 u32 A; 39 u32 B; 40 u32 C; 41 u32 D; 42 43 u32 total[2]; 44 u32 buflen; 45 char buffer[128]; 46 }; 47 48 /* 49 * The following three functions are build up the low level used in 50 * the functions `md5_stream' and `md5_buffer'. 51 */ 52 53 /* Initialize structure containing state of computation. 54 (RFC 1321, 3.3: Step 3) */ 55 extern void md5_init_ctx __P ((struct md5_ctx *ctx)); 56 57 /* Starting with the result of former calls of this function (or the 58 initialization function update the context for the next LEN bytes 59 starting at BUFFER. 60 It is necessary that LEN is a multiple of 64!!! */ 61 extern void md5_process_block __P ((const void *buffer, size_t len, 62 struct md5_ctx *ctx)); 63 64 /* Starting with the result of former calls of this function (or the 65 initialization function update the context for the next LEN bytes 66 starting at BUFFER. 67 It is NOT required that LEN is a multiple of 64. */ 68 extern void md5_process_bytes __P ((const void *buffer, size_t len, 69 struct md5_ctx *ctx)); 70 71 /* Process the remaining bytes in the buffer and put result from CTX 72 in first 16 bytes following RESBUF. The result is always in little 73 endian byte order, so that a byte-wise output yields to the wanted 74 ASCII representation of the message digest. 75 76 IMPORTANT: On some systems it is required that RESBUF be correctly 77 aligned for a 32 bits value. */ 78 extern void *md5_finish_ctx __P ((struct md5_ctx *ctx, void *resbuf)); 79 80 81 /* Put result from CTX in first 16 bytes following RESBUF. The result is 82 always in little endian byte order, so that a byte-wise output yields 83 to the wanted ASCII representation of the message digest. 84 85 IMPORTANT: On some systems it is required that RESBUF is correctly 86 aligned for a 32 bits value. */ 87 extern void *md5_read_ctx __P ((const struct md5_ctx *ctx, void *resbuf)); 88 89 90 /* Compute MD5 message digest for bytes read from STREAM. The 91 resulting message digest number will be written into the 16 bytes 92 beginning at RESBLOCK. */ 93 extern i64 md5_stream __P ((FILE *stream, void *resblock)); 94 95 /* Compute MD5 message digest for LEN bytes beginning at BUFFER. The 96 result is always in little endian byte order, so that a byte-wise 97 output yields to the wanted ASCII representation of the message 98 digest. */ 99 extern void *md5_buffer __P ((const char *buffer, size_t len, void *resblock)); 100 101 #endif 102