Ulrich Drepper | 16303e8 | 2008-02-01 02:19:56 +0000 | [diff] [blame] | 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 Red Hat elfutils. |
| 5 | Written by Ulrich Drepper <drepper@redhat.com>, 1995. |
| 6 | |
| 7 | Red Hat elfutils is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by the |
| 9 | Free Software Foundation; version 2 of the License. |
| 10 | |
| 11 | Red Hat elfutils is distributed in the hope that it will be useful, but |
| 12 | WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License along |
| 17 | with Red Hat elfutils; if not, write to the Free Software Foundation, |
| 18 | Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA. |
| 19 | |
| 20 | Red Hat elfutils is an included package of the Open Invention Network. |
| 21 | An included package of the Open Invention Network is a package for which |
| 22 | Open Invention Network licensees cross-license their patents. No patent |
| 23 | license is granted, either expressly or impliedly, by designation as an |
| 24 | included package. Should you wish to participate in the Open Invention |
| 25 | Network licensing program, please visit www.openinventionnetwork.com |
| 26 | <http://www.openinventionnetwork.com>. */ |
| 27 | |
| 28 | #ifndef _MD5_H |
| 29 | #define _MD5_H 1 |
| 30 | |
| 31 | #include <limits.h> |
| 32 | #include <stdint.h> |
| 33 | #include <stdio.h> |
| 34 | |
| 35 | #define MD5_DIGEST_SIZE 16 |
| 36 | #define MD5_BLOCK_SIZE 64 |
| 37 | |
| 38 | typedef uint32_t md5_uint32; |
| 39 | typedef uintptr_t md5_uintptr; |
| 40 | |
| 41 | /* Structure to save state of computation between the single steps. */ |
| 42 | struct md5_ctx |
| 43 | { |
| 44 | md5_uint32 A; |
| 45 | md5_uint32 B; |
| 46 | md5_uint32 C; |
| 47 | md5_uint32 D; |
| 48 | |
| 49 | md5_uint32 total[2]; |
| 50 | md5_uint32 buflen; |
| 51 | char buffer[128] __attribute__ ((__aligned__ (__alignof__ (md5_uint32)))); |
| 52 | }; |
| 53 | |
| 54 | /* |
| 55 | * The following three functions are build up the low level used in |
| 56 | * the functions `md5_stream' and `md5_buffer'. |
| 57 | */ |
| 58 | |
| 59 | /* Initialize structure containing state of computation. |
| 60 | (RFC 1321, 3.3: Step 3) */ |
| 61 | extern void md5_init_ctx (struct md5_ctx *ctx); |
| 62 | |
| 63 | /* Starting with the result of former calls of this function (or the |
| 64 | initialization function update the context for the next LEN bytes |
| 65 | starting at BUFFER. |
| 66 | It is necessary that LEN is a multiple of 64!!! */ |
| 67 | extern void md5_process_block (const void *buffer, size_t len, |
| 68 | struct md5_ctx *ctx); |
| 69 | |
| 70 | /* Starting with the result of former calls of this function (or the |
| 71 | initialization function update the context for the next LEN bytes |
| 72 | starting at BUFFER. |
| 73 | It is NOT required that LEN is a multiple of 64. */ |
| 74 | extern void md5_process_bytes (const void *buffer, size_t len, |
| 75 | struct md5_ctx *ctx); |
| 76 | |
| 77 | /* Process the remaining bytes in the buffer and put result from CTX |
| 78 | in first 16 bytes following RESBUF. The result is always in little |
| 79 | endian byte order, so that a byte-wise output yields to the wanted |
| 80 | ASCII representation of the message digest. |
| 81 | |
| 82 | IMPORTANT: On some systems it is required that RESBUF is correctly |
| 83 | aligned for a 32 bits value. */ |
| 84 | extern void *md5_finish_ctx (struct md5_ctx *ctx, void *resbuf); |
| 85 | |
| 86 | |
| 87 | /* Put result from CTX in first 16 bytes following RESBUF. The result is |
| 88 | always in little endian byte order, so that a byte-wise output yields |
| 89 | to the wanted ASCII representation of the message digest. |
| 90 | |
| 91 | IMPORTANT: On some systems it is required that RESBUF is correctly |
| 92 | aligned for a 32 bits value. */ |
| 93 | extern void *md5_read_ctx (const struct md5_ctx *ctx, void *resbuf); |
| 94 | |
| 95 | |
| 96 | /* Compute MD5 message digest for bytes read from STREAM. The |
| 97 | resulting message digest number will be written into the 16 bytes |
| 98 | beginning at RESBLOCK. */ |
| 99 | extern int md5_stream (FILE *stream, void *resblock); |
| 100 | |
| 101 | /* Compute MD5 message digest for LEN bytes beginning at BUFFER. The |
| 102 | result is always in little endian byte order, so that a byte-wise |
| 103 | output yields to the wanted ASCII representation of the message |
| 104 | digest. */ |
| 105 | extern void *md5_buffer (const char *buffer, size_t len, void *resblock); |
| 106 | |
| 107 | #endif /* md5.h */ |