util/crc32c.c

   1 /*
   2  *  Castagnoli CRC32C Checksum Algorithm
   3  *
   4  *  Polynomial: 0x11EDC6F41
   5  *
   6  *  Castagnoli93: Guy Castagnoli and Stefan Braeuer and Martin Herrman
   7  *               "Optimization of Cyclic Redundancy-Check Codes with 24
   8  *                 and 32 Parity Bits",IEEE Transactions on Communication,
   9  *                Volume 41, Number 6, June 1993
  10  *
  11  *  Copyright (c) 2013 Red Hat, Inc.,
  12  *
  13  *  Authors:
  14  *   Jeff Cody <jcody@redhat.com>
  15  *
  16  *  Based on the Linux kernel cryptographic crc32c module,
  17  *
  18  *  Copyright (c) 2004 Cisco Systems, Inc.
  19  *  Copyright (c) 2008 Herbert Xu <herbert@gondor.apana.org.au>
  20  *
  21  * This program is free software; you can redistribute it and/or modify it
  22  * under the terms of the GNU General Public License as published by the Free
  23  * Software Foundation; either version 2 of the License, or (at your option)
  24  * any later version.
  25  *
  26  */
  27
  28 #include "qemu/osdep.h"
  29 #include "qemu/crc32c.h"
  30
  31 /*
  32  * This is the CRC-32C table
  33  * Generated with:
  34  * width = 32 bits
  35  * poly = 0x1EDC6F41
  36  * reflect input bytes = true
  37  * reflect output bytes = true
  38  */
  39
  40 static const uint32_t crc32c_table[256] = {
  41     0x00000000L, 0xF26B8303L, 0xE13B70F7L, 0x1350F3F4L,
  42     0xC79A971FL, 0x35F1141CL, 0x26A1E7E8L, 0xD4CA64EBL,
  43     0x8AD958CFL, 0x78B2DBCCL, 0x6BE22838L, 0x9989AB3BL,
  44     0x4D43CFD0L, 0xBF284CD3L, 0xAC78BF27L, 0x5E133C24L,
  45     0x105EC76FL, 0xE235446CL, 0xF165B798L, 0x030E349BL,
  46     0xD7C45070L, 0x25AFD373L, 0x36FF2087L, 0xC494A384L,
  47     0x9A879FA0L, 0x68EC1CA3L, 0x7BBCEF57L, 0x89D76C54L,
  48     0x5D1D08BFL, 0xAF768BBCL, 0xBC267848L, 0x4E4DFB4BL,
  49     0x20BD8EDEL, 0xD2D60DDDL, 0xC186FE29L, 0x33ED7D2AL,
  50     0xE72719C1L, 0x154C9AC2L, 0x061C6936L, 0xF477EA35L,
  51     0xAA64D611L, 0x580F5512L, 0x4B5FA6E6L, 0xB93425E5L,
  52     0x6DFE410EL, 0x9F95C20DL, 0x8CC531F9L, 0x7EAEB2FAL,
  53     0x30E349B1L, 0xC288CAB2L, 0xD1D83946L, 0x23B3BA45L,
  54     0xF779DEAEL, 0x05125DADL, 0x1642AE59L, 0xE4292D5AL,
  55     0xBA3A117EL, 0x4851927DL, 0x5B016189L, 0xA96AE28AL,
  56     0x7DA08661L, 0x8FCB0562L, 0x9C9BF696L, 0x6EF07595L,
  57     0x417B1DBCL, 0xB3109EBFL, 0xA0406D4BL, 0x522BEE48L,
  58     0x86E18AA3L, 0x748A09A0L, 0x67DAFA54L, 0x95B17957L,
  59     0xCBA24573L, 0x39C9C670L, 0x2A993584L, 0xD8F2B687L,
  60     0x0C38D26CL, 0xFE53516FL, 0xED03A29BL, 0x1F682198L,
  61     0x5125DAD3L, 0xA34E59D0L, 0xB01EAA24L, 0x42752927L,
  62     0x96BF4DCCL, 0x64D4CECFL, 0x77843D3BL, 0x85EFBE38L,
  63     0xDBFC821CL, 0x2997011FL, 0x3AC7F2EBL, 0xC8AC71E8L,
  64     0x1C661503L, 0xEE0D9600L, 0xFD5D65F4L, 0x0F36E6F7L,
  65     0x61C69362L, 0x93AD1061L, 0x80FDE395L, 0x72966096L,
  66     0xA65C047DL, 0x5437877EL, 0x4767748AL, 0xB50CF789L,
  67     0xEB1FCBADL, 0x197448AEL, 0x0A24BB5AL, 0xF84F3859L,
  68     0x2C855CB2L, 0xDEEEDFB1L, 0xCDBE2C45L, 0x3FD5AF46L,
  69     0x7198540DL, 0x83F3D70EL, 0x90A324FAL, 0x62C8A7F9L,
  70     0xB602C312L, 0x44694011L, 0x5739B3E5L, 0xA55230E6L,
  71     0xFB410CC2L, 0x092A8FC1L, 0x1A7A7C35L, 0xE811FF36L,
  72     0x3CDB9BDDL, 0xCEB018DEL, 0xDDE0EB2AL, 0x2F8B6829L,
  73     0x82F63B78L, 0x709DB87BL, 0x63CD4B8FL, 0x91A6C88CL,
  74     0x456CAC67L, 0xB7072F64L, 0xA457DC90L, 0x563C5F93L,
  75     0x082F63B7L, 0xFA44E0B4L, 0xE9141340L, 0x1B7F9043L,
  76     0xCFB5F4A8L, 0x3DDE77ABL, 0x2E8E845FL, 0xDCE5075CL,
  77     0x92A8FC17L, 0x60C37F14L, 0x73938CE0L, 0x81F80FE3L,
  78     0x55326B08L, 0xA759E80BL, 0xB4091BFFL, 0x466298FCL,
  79     0x1871A4D8L, 0xEA1A27DBL, 0xF94AD42FL, 0x0B21572CL,
  80     0xDFEB33C7L, 0x2D80B0C4L, 0x3ED04330L, 0xCCBBC033L,
  81     0xA24BB5A6L, 0x502036A5L, 0x4370C551L, 0xB11B4652L,
  82     0x65D122B9L, 0x97BAA1BAL, 0x84EA524EL, 0x7681D14DL,
  83     0x2892ED69L, 0xDAF96E6AL, 0xC9A99D9EL, 0x3BC21E9DL,
  84     0xEF087A76L, 0x1D63F975L, 0x0E330A81L, 0xFC588982L,
  85     0xB21572C9L, 0x407EF1CAL, 0x532E023EL, 0xA145813DL,
  86     0x758FE5D6L, 0x87E466D5L, 0x94B49521L, 0x66DF1622L,
  87     0x38CC2A06L, 0xCAA7A905L, 0xD9F75AF1L, 0x2B9CD9F2L,
  88     0xFF56BD19L, 0x0D3D3E1AL, 0x1E6DCDEEL, 0xEC064EEDL,
  89     0xC38D26C4L, 0x31E6A5C7L, 0x22B65633L, 0xD0DDD530L,
  90     0x0417B1DBL, 0xF67C32D8L, 0xE52CC12CL, 0x1747422FL,
  91     0x49547E0BL, 0xBB3FFD08L, 0xA86F0EFCL, 0x5A048DFFL,
  92     0x8ECEE914L, 0x7CA56A17L, 0x6FF599E3L, 0x9D9E1AE0L,
  93     0xD3D3E1ABL, 0x21B862A8L, 0x32E8915CL, 0xC083125FL,
  94     0x144976B4L, 0xE622F5B7L, 0xF5720643L, 0x07198540L,
  95     0x590AB964L, 0xAB613A67L, 0xB831C993L, 0x4A5A4A90L,
  96     0x9E902E7BL, 0x6CFBAD78L, 0x7FAB5E8CL, 0x8DC0DD8FL,
  97     0xE330A81AL, 0x115B2B19L, 0x020BD8EDL, 0xF0605BEEL,
  98     0x24AA3F05L, 0xD6C1BC06L, 0xC5914FF2L, 0x37FACCF1L,
  99     0x69E9F0D5L, 0x9B8273D6L, 0x88D28022L, 0x7AB90321L,
 100     0xAE7367CAL, 0x5C18E4C9L, 0x4F48173DL, 0xBD23943EL,
 101     0xF36E6F75L, 0x0105EC76L, 0x12551F82L, 0xE03E9C81L,
 102     0x34F4F86AL, 0xC69F7B69L, 0xD5CF889DL, 0x27A40B9EL,
 103     0x79B737BAL, 0x8BDCB4B9L, 0x988C474DL, 0x6AE7C44EL,
 104     0xBE2DA0A5L, 0x4C4623A6L, 0x5F16D052L, 0xAD7D5351L
 105 };
 106
 107
 108 uint32_t crc32c(uint32_t crc, const uint8_t *data, unsigned int length)
 109 {
 110     while (length--) {
 111         crc = crc32c_table[(crc ^ *data++) & 0xFFL] ^ (crc >> 8);
 112     }
 113     return crc^0xffffffff;
 114 }
 115
 116 uint32_t iov_crc32c(uint32_t crc, const struct iovec *iov, size_t iov_cnt)
 117 {
 118     while (iov_cnt--) {
 119         crc = crc32c(crc, iov->iov_base, iov->iov_len) ^ 0xffffffff;
 120         iov++;
 121     }
 122     return crc ^ 0xffffffff;
 123 }