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bac39e0e JA |
1 | /* |
2 | * CRC32C | |
3 | *@Article{castagnoli-crc, | |
4 | * author = { Guy Castagnoli and Stefan Braeuer and Martin Herrman}, | |
5 | * title = {{Optimization of Cyclic Redundancy-Check Codes with 24 | |
6 | * and 32 Parity Bits}}, | |
7 | * journal = IEEE Transactions on Communication, | |
8 | * year = {1993}, | |
9 | * volume = {41}, | |
10 | * number = {6}, | |
11 | * pages = {}, | |
12 | * month = {June}, | |
13 | *} | |
14 | * Used by the iSCSI driver, possibly others, and derived from the | |
15 | * the iscsi-crc.c module of the linux-iscsi driver at | |
16 | * http://linux-iscsi.sourceforge.net. | |
17 | * | |
18 | * Following the example of lib/crc32, this function is intended to be | |
19 | * flexible and useful for all users. Modules that currently have their | |
20 | * own crc32c, but hopefully may be able to use this one are: | |
21 | * net/sctp (please add all your doco to here if you change to | |
22 | * use this one!) | |
23 | * <endoflist> | |
24 | * | |
25 | * Copyright (c) 2004 Cisco Systems, Inc. | |
26 | * | |
27 | * This program is free software; you can redistribute it and/or modify it | |
28 | * under the terms of the GNU General Public License as published by the Free | |
29 | * Software Foundation; either version 2 of the License, or (at your option) | |
30 | * any later version. | |
31 | * | |
32 | */ | |
33 | #include <inttypes.h> | |
34 | ||
10aa136b JA |
35 | #include "crc32c.h" |
36 | ||
bac39e0e JA |
37 | /* |
38 | * This is the CRC-32C table | |
39 | * Generated with: | |
40 | * width = 32 bits | |
41 | * poly = 0x1EDC6F41 | |
42 | * reflect input bytes = true | |
43 | * reflect output bytes = true | |
44 | */ | |
45 | ||
46 | static const uint32_t crc32c_table[256] = { | |
47 | 0x00000000L, 0xF26B8303L, 0xE13B70F7L, 0x1350F3F4L, | |
48 | 0xC79A971FL, 0x35F1141CL, 0x26A1E7E8L, 0xD4CA64EBL, | |
49 | 0x8AD958CFL, 0x78B2DBCCL, 0x6BE22838L, 0x9989AB3BL, | |
50 | 0x4D43CFD0L, 0xBF284CD3L, 0xAC78BF27L, 0x5E133C24L, | |
51 | 0x105EC76FL, 0xE235446CL, 0xF165B798L, 0x030E349BL, | |
52 | 0xD7C45070L, 0x25AFD373L, 0x36FF2087L, 0xC494A384L, | |
53 | 0x9A879FA0L, 0x68EC1CA3L, 0x7BBCEF57L, 0x89D76C54L, | |
54 | 0x5D1D08BFL, 0xAF768BBCL, 0xBC267848L, 0x4E4DFB4BL, | |
55 | 0x20BD8EDEL, 0xD2D60DDDL, 0xC186FE29L, 0x33ED7D2AL, | |
56 | 0xE72719C1L, 0x154C9AC2L, 0x061C6936L, 0xF477EA35L, | |
57 | 0xAA64D611L, 0x580F5512L, 0x4B5FA6E6L, 0xB93425E5L, | |
58 | 0x6DFE410EL, 0x9F95C20DL, 0x8CC531F9L, 0x7EAEB2FAL, | |
59 | 0x30E349B1L, 0xC288CAB2L, 0xD1D83946L, 0x23B3BA45L, | |
60 | 0xF779DEAEL, 0x05125DADL, 0x1642AE59L, 0xE4292D5AL, | |
61 | 0xBA3A117EL, 0x4851927DL, 0x5B016189L, 0xA96AE28AL, | |
62 | 0x7DA08661L, 0x8FCB0562L, 0x9C9BF696L, 0x6EF07595L, | |
63 | 0x417B1DBCL, 0xB3109EBFL, 0xA0406D4BL, 0x522BEE48L, | |
64 | 0x86E18AA3L, 0x748A09A0L, 0x67DAFA54L, 0x95B17957L, | |
65 | 0xCBA24573L, 0x39C9C670L, 0x2A993584L, 0xD8F2B687L, | |
66 | 0x0C38D26CL, 0xFE53516FL, 0xED03A29BL, 0x1F682198L, | |
67 | 0x5125DAD3L, 0xA34E59D0L, 0xB01EAA24L, 0x42752927L, | |
68 | 0x96BF4DCCL, 0x64D4CECFL, 0x77843D3BL, 0x85EFBE38L, | |
69 | 0xDBFC821CL, 0x2997011FL, 0x3AC7F2EBL, 0xC8AC71E8L, | |
70 | 0x1C661503L, 0xEE0D9600L, 0xFD5D65F4L, 0x0F36E6F7L, | |
71 | 0x61C69362L, 0x93AD1061L, 0x80FDE395L, 0x72966096L, | |
72 | 0xA65C047DL, 0x5437877EL, 0x4767748AL, 0xB50CF789L, | |
73 | 0xEB1FCBADL, 0x197448AEL, 0x0A24BB5AL, 0xF84F3859L, | |
74 | 0x2C855CB2L, 0xDEEEDFB1L, 0xCDBE2C45L, 0x3FD5AF46L, | |
75 | 0x7198540DL, 0x83F3D70EL, 0x90A324FAL, 0x62C8A7F9L, | |
76 | 0xB602C312L, 0x44694011L, 0x5739B3E5L, 0xA55230E6L, | |
77 | 0xFB410CC2L, 0x092A8FC1L, 0x1A7A7C35L, 0xE811FF36L, | |
78 | 0x3CDB9BDDL, 0xCEB018DEL, 0xDDE0EB2AL, 0x2F8B6829L, | |
79 | 0x82F63B78L, 0x709DB87BL, 0x63CD4B8FL, 0x91A6C88CL, | |
80 | 0x456CAC67L, 0xB7072F64L, 0xA457DC90L, 0x563C5F93L, | |
81 | 0x082F63B7L, 0xFA44E0B4L, 0xE9141340L, 0x1B7F9043L, | |
82 | 0xCFB5F4A8L, 0x3DDE77ABL, 0x2E8E845FL, 0xDCE5075CL, | |
83 | 0x92A8FC17L, 0x60C37F14L, 0x73938CE0L, 0x81F80FE3L, | |
84 | 0x55326B08L, 0xA759E80BL, 0xB4091BFFL, 0x466298FCL, | |
85 | 0x1871A4D8L, 0xEA1A27DBL, 0xF94AD42FL, 0x0B21572CL, | |
86 | 0xDFEB33C7L, 0x2D80B0C4L, 0x3ED04330L, 0xCCBBC033L, | |
87 | 0xA24BB5A6L, 0x502036A5L, 0x4370C551L, 0xB11B4652L, | |
88 | 0x65D122B9L, 0x97BAA1BAL, 0x84EA524EL, 0x7681D14DL, | |
89 | 0x2892ED69L, 0xDAF96E6AL, 0xC9A99D9EL, 0x3BC21E9DL, | |
90 | 0xEF087A76L, 0x1D63F975L, 0x0E330A81L, 0xFC588982L, | |
91 | 0xB21572C9L, 0x407EF1CAL, 0x532E023EL, 0xA145813DL, | |
92 | 0x758FE5D6L, 0x87E466D5L, 0x94B49521L, 0x66DF1622L, | |
93 | 0x38CC2A06L, 0xCAA7A905L, 0xD9F75AF1L, 0x2B9CD9F2L, | |
94 | 0xFF56BD19L, 0x0D3D3E1AL, 0x1E6DCDEEL, 0xEC064EEDL, | |
95 | 0xC38D26C4L, 0x31E6A5C7L, 0x22B65633L, 0xD0DDD530L, | |
96 | 0x0417B1DBL, 0xF67C32D8L, 0xE52CC12CL, 0x1747422FL, | |
97 | 0x49547E0BL, 0xBB3FFD08L, 0xA86F0EFCL, 0x5A048DFFL, | |
98 | 0x8ECEE914L, 0x7CA56A17L, 0x6FF599E3L, 0x9D9E1AE0L, | |
99 | 0xD3D3E1ABL, 0x21B862A8L, 0x32E8915CL, 0xC083125FL, | |
100 | 0x144976B4L, 0xE622F5B7L, 0xF5720643L, 0x07198540L, | |
101 | 0x590AB964L, 0xAB613A67L, 0xB831C993L, 0x4A5A4A90L, | |
102 | 0x9E902E7BL, 0x6CFBAD78L, 0x7FAB5E8CL, 0x8DC0DD8FL, | |
103 | 0xE330A81AL, 0x115B2B19L, 0x020BD8EDL, 0xF0605BEEL, | |
104 | 0x24AA3F05L, 0xD6C1BC06L, 0xC5914FF2L, 0x37FACCF1L, | |
105 | 0x69E9F0D5L, 0x9B8273D6L, 0x88D28022L, 0x7AB90321L, | |
106 | 0xAE7367CAL, 0x5C18E4C9L, 0x4F48173DL, 0xBD23943EL, | |
107 | 0xF36E6F75L, 0x0105EC76L, 0x12551F82L, 0xE03E9C81L, | |
108 | 0x34F4F86AL, 0xC69F7B69L, 0xD5CF889DL, 0x27A40B9EL, | |
109 | 0x79B737BAL, 0x8BDCB4B9L, 0x988C474DL, 0x6AE7C44EL, | |
110 | 0xBE2DA0A5L, 0x4C4623A6L, 0x5F16D052L, 0xAD7D5351L | |
111 | }; | |
112 | ||
113 | /* | |
114 | * Steps through buffer one byte at at time, calculates reflected | |
115 | * crc using table. | |
116 | */ | |
117 | ||
e3aaafc4 | 118 | uint32_t crc32c_sw(unsigned char const *data, unsigned long length) |
bac39e0e JA |
119 | { |
120 | uint32_t crc = ~0; | |
121 | ||
122 | while (length--) | |
123 | crc = crc32c_table[(crc ^ *data++) & 0xFFL] ^ (crc >> 8); | |
124 | ||
125 | return crc; | |
126 | } |