1 /* $OpenBSD: crc32.c,v 1.11 2006/04/22 18:29:33 stevesk Exp $ */ 2 3 /* 4 * Copyright (c) 2003 Markus Friedl. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 #include "includes.h" 27 #include "crc32.h" 28 29 static const u_int32_t crc32tab[] = { 30 0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 31 0x076dc419L, 0x706af48fL, 0xe963a535L, 0x9e6495a3L, 32 0x0edb8832L, 0x79dcb8a4L, 0xe0d5e91eL, 0x97d2d988L, 33 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L, 0x90bf1d91L, 34 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL, 35 0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 36 0x136c9856L, 0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 37 0x14015c4fL, 0x63066cd9L, 0xfa0f3d63L, 0x8d080df5L, 38 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L, 0xa2677172L, 39 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL, 40 0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 41 0x32d86ce3L, 0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 42 0x26d930acL, 0x51de003aL, 0xc8d75180L, 0xbfd06116L, 43 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L, 0xb8bda50fL, 44 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L, 45 0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 46 0x76dc4190L, 0x01db7106L, 0x98d220bcL, 0xefd5102aL, 47 0x71b18589L, 0x06b6b51fL, 0x9fbfe4a5L, 0xe8b8d433L, 48 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL, 0xe10e9818L, 49 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L, 50 0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 51 0x6c0695edL, 0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 52 0x65b0d9c6L, 0x12b7e950L, 0x8bbeb8eaL, 0xfcb9887cL, 53 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L, 0xfbd44c65L, 54 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L, 55 0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 56 0x4369e96aL, 0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 57 0x44042d73L, 0x33031de5L, 0xaa0a4c5fL, 0xdd0d7cc9L, 58 0x5005713cL, 0x270241aaL, 0xbe0b1010L, 0xc90c2086L, 59 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL, 60 0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 61 0x59b33d17L, 0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 62 0xedb88320L, 0x9abfb3b6L, 0x03b6e20cL, 0x74b1d29aL, 63 0xead54739L, 0x9dd277afL, 0x04db2615L, 0x73dc1683L, 64 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L, 65 0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 66 0xf00f9344L, 0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 67 0xf762575dL, 0x806567cbL, 0x196c3671L, 0x6e6b06e7L, 68 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL, 0x67dd4accL, 69 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L, 70 0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 71 0xd1bb67f1L, 0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 72 0xd80d2bdaL, 0xaf0a1b4cL, 0x36034af6L, 0x41047a60L, 73 0xdf60efc3L, 0xa867df55L, 0x316e8eefL, 0x4669be79L, 74 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L, 75 0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 76 0xc5ba3bbeL, 0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 77 0xc2d7ffa7L, 0xb5d0cf31L, 0x2cd99e8bL, 0x5bdeae1dL, 78 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL, 0x026d930aL, 79 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L, 80 0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 81 0x92d28e9bL, 0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 82 0x86d3d2d4L, 0xf1d4e242L, 0x68ddb3f8L, 0x1fda836eL, 83 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L, 0x18b74777L, 84 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL, 85 0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 86 0xa00ae278L, 0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 87 0xa7672661L, 0xd06016f7L, 0x4969474dL, 0x3e6e77dbL, 88 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L, 0x37d83bf0L, 89 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L, 90 0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 91 0xbad03605L, 0xcdd70693L, 0x54de5729L, 0x23d967bfL, 92 0xb3667a2eL, 0xc4614ab8L, 0x5d681b02L, 0x2a6f2b94L, 93 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL, 0x2d02ef8dL 94 }; 95 96 u_int32_t 97 ssh_crc32(const u_char *buf, u_int32_t size) 98 { 99 u_int32_t i, crc; 100 101 crc = 0; 102 for (i = 0; i < size; i++) 103 crc = crc32tab[(crc ^ buf[i]) & 0xff] ^ (crc >> 8); 104 return crc; 105 } 106
