]>
git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - lib/libcrc32c.c
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,
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.
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
25 * Copyright (c) 2004 Cisco Systems, Inc.
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)
33 #include <linux/crc32c.h>
34 #include <linux/compiler.h>
35 #include <linux/module.h>
36 #include <asm/byteorder.h>
38 MODULE_AUTHOR("Clay Haapala <chaapala@cisco.com>");
39 MODULE_DESCRIPTION("CRC32c (Castagnoli) calculations");
40 MODULE_LICENSE("GPL");
42 #define CRC32C_POLY_BE 0x1EDC6F41
43 #define CRC32C_POLY_LE 0x82F63B78
46 # define CRC_LE_BITS 8
51 * Haven't generated a big-endian table yet, but the bit-wise version
52 * should at least work.
54 #if defined CRC_BE_BITS && CRC_BE_BITS != 1
58 # define CRC_BE_BITS 1
61 EXPORT_SYMBOL(crc32c_le
);
65 * Compute things bit-wise, as done in crc32.c. We could share the tight
66 * loop below with crc32 and vary the POLY if we don't find value in terms
67 * of space and maintainability in keeping the two modules separate.
70 crc32c_le(u32 crc
, unsigned char const *p
, size_t len
)
75 for (i
= 0; i
< 8; i
++)
76 crc
= (crc
>> 1) ^ ((crc
& 1) ? CRC32C_POLY_LE
: 0);
83 * This is the CRC-32C table
87 * reflect input bytes = true
88 * reflect output bytes = true
91 static const u32 crc32c_table
[256] = {
92 0x00000000L
, 0xF26B8303L
, 0xE13B70F7L
, 0x1350F3F4L
,
93 0xC79A971FL
, 0x35F1141CL
, 0x26A1E7E8L
, 0xD4CA64EBL
,
94 0x8AD958CFL
, 0x78B2DBCCL
, 0x6BE22838L
, 0x9989AB3BL
,
95 0x4D43CFD0L
, 0xBF284CD3L
, 0xAC78BF27L
, 0x5E133C24L
,
96 0x105EC76FL
, 0xE235446CL
, 0xF165B798L
, 0x030E349BL
,
97 0xD7C45070L
, 0x25AFD373L
, 0x36FF2087L
, 0xC494A384L
,
98 0x9A879FA0L
, 0x68EC1CA3L
, 0x7BBCEF57L
, 0x89D76C54L
,
99 0x5D1D08BFL
, 0xAF768BBCL
, 0xBC267848L
, 0x4E4DFB4BL
,
100 0x20BD8EDEL
, 0xD2D60DDDL
, 0xC186FE29L
, 0x33ED7D2AL
,
101 0xE72719C1L
, 0x154C9AC2L
, 0x061C6936L
, 0xF477EA35L
,
102 0xAA64D611L
, 0x580F5512L
, 0x4B5FA6E6L
, 0xB93425E5L
,
103 0x6DFE410EL
, 0x9F95C20DL
, 0x8CC531F9L
, 0x7EAEB2FAL
,
104 0x30E349B1L
, 0xC288CAB2L
, 0xD1D83946L
, 0x23B3BA45L
,
105 0xF779DEAEL
, 0x05125DADL
, 0x1642AE59L
, 0xE4292D5AL
,
106 0xBA3A117EL
, 0x4851927DL
, 0x5B016189L
, 0xA96AE28AL
,
107 0x7DA08661L
, 0x8FCB0562L
, 0x9C9BF696L
, 0x6EF07595L
,
108 0x417B1DBCL
, 0xB3109EBFL
, 0xA0406D4BL
, 0x522BEE48L
,
109 0x86E18AA3L
, 0x748A09A0L
, 0x67DAFA54L
, 0x95B17957L
,
110 0xCBA24573L
, 0x39C9C670L
, 0x2A993584L
, 0xD8F2B687L
,
111 0x0C38D26CL
, 0xFE53516FL
, 0xED03A29BL
, 0x1F682198L
,
112 0x5125DAD3L
, 0xA34E59D0L
, 0xB01EAA24L
, 0x42752927L
,
113 0x96BF4DCCL
, 0x64D4CECFL
, 0x77843D3BL
, 0x85EFBE38L
,
114 0xDBFC821CL
, 0x2997011FL
, 0x3AC7F2EBL
, 0xC8AC71E8L
,
115 0x1C661503L
, 0xEE0D9600L
, 0xFD5D65F4L
, 0x0F36E6F7L
,
116 0x61C69362L
, 0x93AD1061L
, 0x80FDE395L
, 0x72966096L
,
117 0xA65C047DL
, 0x5437877EL
, 0x4767748AL
, 0xB50CF789L
,
118 0xEB1FCBADL
, 0x197448AEL
, 0x0A24BB5AL
, 0xF84F3859L
,
119 0x2C855CB2L
, 0xDEEEDFB1L
, 0xCDBE2C45L
, 0x3FD5AF46L
,
120 0x7198540DL
, 0x83F3D70EL
, 0x90A324FAL
, 0x62C8A7F9L
,
121 0xB602C312L
, 0x44694011L
, 0x5739B3E5L
, 0xA55230E6L
,
122 0xFB410CC2L
, 0x092A8FC1L
, 0x1A7A7C35L
, 0xE811FF36L
,
123 0x3CDB9BDDL
, 0xCEB018DEL
, 0xDDE0EB2AL
, 0x2F8B6829L
,
124 0x82F63B78L
, 0x709DB87BL
, 0x63CD4B8FL
, 0x91A6C88CL
,
125 0x456CAC67L
, 0xB7072F64L
, 0xA457DC90L
, 0x563C5F93L
,
126 0x082F63B7L
, 0xFA44E0B4L
, 0xE9141340L
, 0x1B7F9043L
,
127 0xCFB5F4A8L
, 0x3DDE77ABL
, 0x2E8E845FL
, 0xDCE5075CL
,
128 0x92A8FC17L
, 0x60C37F14L
, 0x73938CE0L
, 0x81F80FE3L
,
129 0x55326B08L
, 0xA759E80BL
, 0xB4091BFFL
, 0x466298FCL
,
130 0x1871A4D8L
, 0xEA1A27DBL
, 0xF94AD42FL
, 0x0B21572CL
,
131 0xDFEB33C7L
, 0x2D80B0C4L
, 0x3ED04330L
, 0xCCBBC033L
,
132 0xA24BB5A6L
, 0x502036A5L
, 0x4370C551L
, 0xB11B4652L
,
133 0x65D122B9L
, 0x97BAA1BAL
, 0x84EA524EL
, 0x7681D14DL
,
134 0x2892ED69L
, 0xDAF96E6AL
, 0xC9A99D9EL
, 0x3BC21E9DL
,
135 0xEF087A76L
, 0x1D63F975L
, 0x0E330A81L
, 0xFC588982L
,
136 0xB21572C9L
, 0x407EF1CAL
, 0x532E023EL
, 0xA145813DL
,
137 0x758FE5D6L
, 0x87E466D5L
, 0x94B49521L
, 0x66DF1622L
,
138 0x38CC2A06L
, 0xCAA7A905L
, 0xD9F75AF1L
, 0x2B9CD9F2L
,
139 0xFF56BD19L
, 0x0D3D3E1AL
, 0x1E6DCDEEL
, 0xEC064EEDL
,
140 0xC38D26C4L
, 0x31E6A5C7L
, 0x22B65633L
, 0xD0DDD530L
,
141 0x0417B1DBL
, 0xF67C32D8L
, 0xE52CC12CL
, 0x1747422FL
,
142 0x49547E0BL
, 0xBB3FFD08L
, 0xA86F0EFCL
, 0x5A048DFFL
,
143 0x8ECEE914L
, 0x7CA56A17L
, 0x6FF599E3L
, 0x9D9E1AE0L
,
144 0xD3D3E1ABL
, 0x21B862A8L
, 0x32E8915CL
, 0xC083125FL
,
145 0x144976B4L
, 0xE622F5B7L
, 0xF5720643L
, 0x07198540L
,
146 0x590AB964L
, 0xAB613A67L
, 0xB831C993L
, 0x4A5A4A90L
,
147 0x9E902E7BL
, 0x6CFBAD78L
, 0x7FAB5E8CL
, 0x8DC0DD8FL
,
148 0xE330A81AL
, 0x115B2B19L
, 0x020BD8EDL
, 0xF0605BEEL
,
149 0x24AA3F05L
, 0xD6C1BC06L
, 0xC5914FF2L
, 0x37FACCF1L
,
150 0x69E9F0D5L
, 0x9B8273D6L
, 0x88D28022L
, 0x7AB90321L
,
151 0xAE7367CAL
, 0x5C18E4C9L
, 0x4F48173DL
, 0xBD23943EL
,
152 0xF36E6F75L
, 0x0105EC76L
, 0x12551F82L
, 0xE03E9C81L
,
153 0x34F4F86AL
, 0xC69F7B69L
, 0xD5CF889DL
, 0x27A40B9EL
,
154 0x79B737BAL
, 0x8BDCB4B9L
, 0x988C474DL
, 0x6AE7C44EL
,
155 0xBE2DA0A5L
, 0x4C4623A6L
, 0x5F16D052L
, 0xAD7D5351L
159 * Steps through buffer one byte at at time, calculates reflected
164 crc32c_le(u32 seed
, unsigned char const *data
, size_t length
)
166 u32 crc
= __cpu_to_le32(seed
);
170 crc32c_table
[(crc
^ *data
++) & 0xFFL
] ^ (crc
>> 8);
172 return __le32_to_cpu(crc
);
175 #endif /* CRC_LE_BITS == 8 */
177 EXPORT_SYMBOL(crc32c_be
);
181 crc32c_be(u32 crc
, unsigned char const *p
, size_t len
)
186 for (i
= 0; i
< 8; i
++)
188 (crc
<< 1) ^ ((crc
& 0x80000000) ? CRC32C_POLY_BE
:
198 * A small unit test suite is implemented as part of the crypto suite.
199 * Select CRYPTO_CRC32C and use the tcrypt module to run the tests.