1 /* Declaration of functions and data types used for MD5 sum computing 2 library functions. 3 Copyright (C) 1995,1996,1997,1999-2001,2004,2005,2008 Red Hat, Inc. 4 This file is part of elfutils. 5 Written by Ulrich Drepper <drepper (at) redhat.com>, 1995. 6 7 This file is free software; you can redistribute it and/or modify 8 it under the terms of either 9 10 * the GNU Lesser General Public License as published by the Free 11 Software Foundation; either version 3 of the License, or (at 12 your option) any later version 13 14 or 15 16 * the GNU General Public License as published by the Free 17 Software Foundation; either version 2 of the License, or (at 18 your option) any later version 19 20 or both in parallel, as here. 21 22 elfutils is distributed in the hope that it will be useful, but 23 WITHOUT ANY WARRANTY; without even the implied warranty of 24 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 25 General Public License for more details. 26 27 You should have received copies of the GNU General Public License and 28 the GNU Lesser General Public License along with this program. If 29 not, see <http://www.gnu.org/licenses/>. */ 30 31 #ifndef _MD5_H 32 #define _MD5_H 1 33 34 #include <limits.h> 35 #include <stdint.h> 36 #include <stdio.h> 37 38 #define MD5_DIGEST_SIZE 16 39 #define MD5_BLOCK_SIZE 64 40 41 typedef uint32_t md5_uint32; 42 typedef uintptr_t md5_uintptr; 43 44 /* Structure to save state of computation between the single steps. */ 45 struct md5_ctx 46 { 47 md5_uint32 A; 48 md5_uint32 B; 49 md5_uint32 C; 50 md5_uint32 D; 51 52 md5_uint32 total[2]; 53 md5_uint32 buflen; 54 char buffer[128] __attribute__ ((__aligned__ (__alignof__ (md5_uint32)))); 55 }; 56 57 /* 58 * The following three functions are build up the low level used in 59 * the functions `md5_stream' and `md5_buffer'. 60 */ 61 62 /* Initialize structure containing state of computation. 63 (RFC 1321, 3.3: Step 3) */ 64 extern void md5_init_ctx (struct md5_ctx *ctx); 65 66 /* Starting with the result of former calls of this function (or the 67 initialization function update the context for the next LEN bytes 68 starting at BUFFER. 69 It is necessary that LEN is a multiple of 64!!! */ 70 extern void md5_process_block (const void *buffer, size_t len, 71 struct md5_ctx *ctx); 72 73 /* Starting with the result of former calls of this function (or the 74 initialization function update the context for the next LEN bytes 75 starting at BUFFER. 76 It is NOT required that LEN is a multiple of 64. */ 77 extern void md5_process_bytes (const void *buffer, size_t len, 78 struct md5_ctx *ctx); 79 80 /* Process the remaining bytes in the buffer and put result from CTX 81 in first 16 bytes following RESBUF. The result is always in little 82 endian byte order, so that a byte-wise output yields to the wanted 83 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_finish_ctx (struct md5_ctx *ctx, void *resbuf); 88 89 90 /* Put result from CTX in first 16 bytes following RESBUF. The result is 91 always in little endian byte order, so that a byte-wise output yields 92 to the wanted ASCII representation of the message digest. 93 94 IMPORTANT: On some systems it is required that RESBUF is correctly 95 aligned for a 32 bits value. */ 96 extern void *md5_read_ctx (const struct md5_ctx *ctx, void *resbuf); 97 98 99 /* Compute MD5 message digest for bytes read from STREAM. The 100 resulting message digest number will be written into the 16 bytes 101 beginning at RESBLOCK. */ 102 extern int md5_stream (FILE *stream, void *resblock); 103 104 /* Compute MD5 message digest for LEN bytes beginning at BUFFER. The 105 result is always in little endian byte order, so that a byte-wise 106 output yields to the wanted ASCII representation of the message 107 digest. */ 108 extern void *md5_buffer (const char *buffer, size_t len, void *resblock); 109 110 #endif /* md5.h */ 111
