1 /*- 2 * Copyright (c) 2005-2010 Daniel Braniss <danny@cs.huji.ac.il> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 */ 27 /* 28 | iSCSI 29 | $Id: isc_subr.c 560 2009-05-07 07:37:49Z danny $ 30 */ 31 32 #ifdef _KERNEL 33 #include <sys/param.h> 34 #include <sys/systm.h> 35 #else 36 #include <sys/types.h> 37 #endif 38 39 #ifndef _KERNEL 40 /* prototypes for the kernel are in <sys/systm.h> */ 41 uint32_t iscsi_crc32(const void *buf, size_t size); 42 uint32_t iscsi_crc32_ext(const void *buf, size_t size, uint32_t ocrc); 43 #endif 44 45 /*****************************************************************/ 46 /* */ 47 /* CRC LOOKUP TABLE */ 48 /* ================ */ 49 /* The following CRC lookup table was generated automagically */ 50 /* by the Rocksoft^tm Model CRC Algorithm Table Generation */ 51 /* Program V1.0 using the following model parameters: */ 52 /* */ 53 /* Width : 4 bytes. */ 54 /* Poly : 0x1EDC6F41L */ 55 /* Reverse : TRUE. */ 56 /* */ 57 /* For more information on the Rocksoft^tm Model CRC Algorithm, */ 58 /* see the document titled "A Painless Guide to CRC Error */ 59 /* Detection Algorithms" by Ross Williams */ 60 /* (ross@guest.adelaide.edu.au.). This document is likely to be */ 61 /* in the FTP archive "ftp.adelaide.edu.au/pub/rocksoft". */ 62 /* */ 63 /*****************************************************************/ 64 65 static uint32_t iscsiCrc32Table[256] = { 66 0x00000000L, 0xF26B8303L, 0xE13B70F7L, 0x1350F3F4L, 67 0xC79A971FL, 0x35F1141CL, 0x26A1E7E8L, 0xD4CA64EBL, 68 0x8AD958CFL, 0x78B2DBCCL, 0x6BE22838L, 0x9989AB3BL, 69 0x4D43CFD0L, 0xBF284CD3L, 0xAC78BF27L, 0x5E133C24L, 70 0x105EC76FL, 0xE235446CL, 0xF165B798L, 0x030E349BL, 71 0xD7C45070L, 0x25AFD373L, 0x36FF2087L, 0xC494A384L, 72 0x9A879FA0L, 0x68EC1CA3L, 0x7BBCEF57L, 0x89D76C54L, 73 0x5D1D08BFL, 0xAF768BBCL, 0xBC267848L, 0x4E4DFB4BL, 74 0x20BD8EDEL, 0xD2D60DDDL, 0xC186FE29L, 0x33ED7D2AL, 75 0xE72719C1L, 0x154C9AC2L, 0x061C6936L, 0xF477EA35L, 76 0xAA64D611L, 0x580F5512L, 0x4B5FA6E6L, 0xB93425E5L, 77 0x6DFE410EL, 0x9F95C20DL, 0x8CC531F9L, 0x7EAEB2FAL, 78 0x30E349B1L, 0xC288CAB2L, 0xD1D83946L, 0x23B3BA45L, 79 0xF779DEAEL, 0x05125DADL, 0x1642AE59L, 0xE4292D5AL, 80 0xBA3A117EL, 0x4851927DL, 0x5B016189L, 0xA96AE28AL, 81 0x7DA08661L, 0x8FCB0562L, 0x9C9BF696L, 0x6EF07595L, 82 0x417B1DBCL, 0xB3109EBFL, 0xA0406D4BL, 0x522BEE48L, 83 0x86E18AA3L, 0x748A09A0L, 0x67DAFA54L, 0x95B17957L, 84 0xCBA24573L, 0x39C9C670L, 0x2A993584L, 0xD8F2B687L, 85 0x0C38D26CL, 0xFE53516FL, 0xED03A29BL, 0x1F682198L, 86 0x5125DAD3L, 0xA34E59D0L, 0xB01EAA24L, 0x42752927L, 87 0x96BF4DCCL, 0x64D4CECFL, 0x77843D3BL, 0x85EFBE38L, 88 0xDBFC821CL, 0x2997011FL, 0x3AC7F2EBL, 0xC8AC71E8L, 89 0x1C661503L, 0xEE0D9600L, 0xFD5D65F4L, 0x0F36E6F7L, 90 0x61C69362L, 0x93AD1061L, 0x80FDE395L, 0x72966096L, 91 0xA65C047DL, 0x5437877EL, 0x4767748AL, 0xB50CF789L, 92 0xEB1FCBADL, 0x197448AEL, 0x0A24BB5AL, 0xF84F3859L, 93 0x2C855CB2L, 0xDEEEDFB1L, 0xCDBE2C45L, 0x3FD5AF46L, 94 0x7198540DL, 0x83F3D70EL, 0x90A324FAL, 0x62C8A7F9L, 95 0xB602C312L, 0x44694011L, 0x5739B3E5L, 0xA55230E6L, 96 0xFB410CC2L, 0x092A8FC1L, 0x1A7A7C35L, 0xE811FF36L, 97 0x3CDB9BDDL, 0xCEB018DEL, 0xDDE0EB2AL, 0x2F8B6829L, 98 0x82F63B78L, 0x709DB87BL, 0x63CD4B8FL, 0x91A6C88CL, 99 0x456CAC67L, 0xB7072F64L, 0xA457DC90L, 0x563C5F93L, 100 0x082F63B7L, 0xFA44E0B4L, 0xE9141340L, 0x1B7F9043L, 101 0xCFB5F4A8L, 0x3DDE77ABL, 0x2E8E845FL, 0xDCE5075CL, 102 0x92A8FC17L, 0x60C37F14L, 0x73938CE0L, 0x81F80FE3L, 103 0x55326B08L, 0xA759E80BL, 0xB4091BFFL, 0x466298FCL, 104 0x1871A4D8L, 0xEA1A27DBL, 0xF94AD42FL, 0x0B21572CL, 105 0xDFEB33C7L, 0x2D80B0C4L, 0x3ED04330L, 0xCCBBC033L, 106 0xA24BB5A6L, 0x502036A5L, 0x4370C551L, 0xB11B4652L, 107 0x65D122B9L, 0x97BAA1BAL, 0x84EA524EL, 0x7681D14DL, 108 0x2892ED69L, 0xDAF96E6AL, 0xC9A99D9EL, 0x3BC21E9DL, 109 0xEF087A76L, 0x1D63F975L, 0x0E330A81L, 0xFC588982L, 110 0xB21572C9L, 0x407EF1CAL, 0x532E023EL, 0xA145813DL, 111 0x758FE5D6L, 0x87E466D5L, 0x94B49521L, 0x66DF1622L, 112 0x38CC2A06L, 0xCAA7A905L, 0xD9F75AF1L, 0x2B9CD9F2L, 113 0xFF56BD19L, 0x0D3D3E1AL, 0x1E6DCDEEL, 0xEC064EEDL, 114 0xC38D26C4L, 0x31E6A5C7L, 0x22B65633L, 0xD0DDD530L, 115 0x0417B1DBL, 0xF67C32D8L, 0xE52CC12CL, 0x1747422FL, 116 0x49547E0BL, 0xBB3FFD08L, 0xA86F0EFCL, 0x5A048DFFL, 117 0x8ECEE914L, 0x7CA56A17L, 0x6FF599E3L, 0x9D9E1AE0L, 118 0xD3D3E1ABL, 0x21B862A8L, 0x32E8915CL, 0xC083125FL, 119 0x144976B4L, 0xE622F5B7L, 0xF5720643L, 0x07198540L, 120 0x590AB964L, 0xAB613A67L, 0xB831C993L, 0x4A5A4A90L, 121 0x9E902E7BL, 0x6CFBAD78L, 0x7FAB5E8CL, 0x8DC0DD8FL, 122 0xE330A81AL, 0x115B2B19L, 0x020BD8EDL, 0xF0605BEEL, 123 0x24AA3F05L, 0xD6C1BC06L, 0xC5914FF2L, 0x37FACCF1L, 124 0x69E9F0D5L, 0x9B8273D6L, 0x88D28022L, 0x7AB90321L, 125 0xAE7367CAL, 0x5C18E4C9L, 0x4F48173DL, 0xBD23943EL, 126 0xF36E6F75L, 0x0105EC76L, 0x12551F82L, 0xE03E9C81L, 127 0x34F4F86AL, 0xC69F7B69L, 0xD5CF889DL, 0x27A40B9EL, 128 0x79B737BAL, 0x8BDCB4B9L, 0x988C474DL, 0x6AE7C44EL, 129 0xBE2DA0A5L, 0x4C4623A6L, 0x5F16D052L, 0xAD7D5351L 130 }; 131 132 uint32_t 133 iscsi_crc32(const void *buf, size_t size) 134 { 135 const uint8_t *p = buf; 136 uint32_t crc = 0; 137 138 crc = crc ^ 0xffffffff; 139 while (size--) 140 crc = iscsiCrc32Table[(crc ^ *p++) & 0xff] ^ (crc >> 8); 141 crc = crc ^ 0xffffffff; 142 return crc; 143 } 144 145 uint32_t 146 iscsi_crc32_ext(const void *buf, size_t size, uint32_t crc) 147 { 148 const uint8_t *p = buf; 149 150 crc = crc ^ 0xffffffff; 151 while (size--) 152 crc = iscsiCrc32Table[(crc ^ *p++) & 0xff] ^ (crc >> 8); 153 crc = crc ^ 0xffffffff; 154 return crc; 155 } 156