diff options
Diffstat (limited to 'crypto')
-rw-r--r-- | crypto/Kconfig | 4 | ||||
-rw-r--r-- | crypto/crc32c.c | 113 |
2 files changed, 112 insertions, 5 deletions
diff --git a/crypto/Kconfig b/crypto/Kconfig index dc20a34ba5ef..aede80246df2 100644 --- a/crypto/Kconfig +++ b/crypto/Kconfig | |||
@@ -256,12 +256,10 @@ comment "Digest" | |||
256 | config CRYPTO_CRC32C | 256 | config CRYPTO_CRC32C |
257 | tristate "CRC32c CRC algorithm" | 257 | tristate "CRC32c CRC algorithm" |
258 | select CRYPTO_HASH | 258 | select CRYPTO_HASH |
259 | select LIBCRC32C | ||
260 | help | 259 | help |
261 | Castagnoli, et al Cyclic Redundancy-Check Algorithm. Used | 260 | Castagnoli, et al Cyclic Redundancy-Check Algorithm. Used |
262 | by iSCSI for header and data digests and by others. | 261 | by iSCSI for header and data digests and by others. |
263 | See Castagnoli93. This implementation uses lib/libcrc32c. | 262 | See Castagnoli93. Module will be crc32c. |
264 | Module will be crc32c. | ||
265 | 263 | ||
266 | config CRYPTO_CRC32C_INTEL | 264 | config CRYPTO_CRC32C_INTEL |
267 | tristate "CRC32c INTEL hardware acceleration" | 265 | tristate "CRC32c INTEL hardware acceleration" |
diff --git a/crypto/crc32c.c b/crypto/crc32c.c index b21b93f2bb90..973bc2cfab2e 100644 --- a/crypto/crc32c.c +++ b/crypto/crc32c.c | |||
@@ -3,8 +3,29 @@ | |||
3 | * | 3 | * |
4 | * CRC32C chksum | 4 | * CRC32C chksum |
5 | * | 5 | * |
6 | * This module file is a wrapper to invoke the lib/crc32c routines. | 6 | *@Article{castagnoli-crc, |
7 | * author = { Guy Castagnoli and Stefan Braeuer and Martin Herrman}, | ||
8 | * title = {{Optimization of Cyclic Redundancy-Check Codes with 24 | ||
9 | * and 32 Parity Bits}}, | ||
10 | * journal = IEEE Transactions on Communication, | ||
11 | * year = {1993}, | ||
12 | * volume = {41}, | ||
13 | * number = {6}, | ||
14 | * pages = {}, | ||
15 | * month = {June}, | ||
16 | *} | ||
17 | * Used by the iSCSI driver, possibly others, and derived from the | ||
18 | * the iscsi-crc.c module of the linux-iscsi driver at | ||
19 | * http://linux-iscsi.sourceforge.net. | ||
7 | * | 20 | * |
21 | * Following the example of lib/crc32, this function is intended to be | ||
22 | * flexible and useful for all users. Modules that currently have their | ||
23 | * own crc32c, but hopefully may be able to use this one are: | ||
24 | * net/sctp (please add all your doco to here if you change to | ||
25 | * use this one!) | ||
26 | * <endoflist> | ||
27 | * | ||
28 | * Copyright (c) 2004 Cisco Systems, Inc. | ||
8 | * Copyright (c) 2008 Herbert Xu <herbert@gondor.apana.org.au> | 29 | * Copyright (c) 2008 Herbert Xu <herbert@gondor.apana.org.au> |
9 | * | 30 | * |
10 | * This program is free software; you can redistribute it and/or modify it | 31 | * This program is free software; you can redistribute it and/or modify it |
@@ -18,7 +39,6 @@ | |||
18 | #include <linux/init.h> | 39 | #include <linux/init.h> |
19 | #include <linux/module.h> | 40 | #include <linux/module.h> |
20 | #include <linux/string.h> | 41 | #include <linux/string.h> |
21 | #include <linux/crc32c.h> | ||
22 | #include <linux/kernel.h> | 42 | #include <linux/kernel.h> |
23 | 43 | ||
24 | #define CHKSUM_BLOCK_SIZE 1 | 44 | #define CHKSUM_BLOCK_SIZE 1 |
@@ -33,6 +53,95 @@ struct chksum_desc_ctx { | |||
33 | }; | 53 | }; |
34 | 54 | ||
35 | /* | 55 | /* |
56 | * This is the CRC-32C table | ||
57 | * Generated with: | ||
58 | * width = 32 bits | ||
59 | * poly = 0x1EDC6F41 | ||
60 | * reflect input bytes = true | ||
61 | * reflect output bytes = true | ||
62 | */ | ||
63 | |||
64 | static const u32 crc32c_table[256] = { | ||
65 | 0x00000000L, 0xF26B8303L, 0xE13B70F7L, 0x1350F3F4L, | ||
66 | 0xC79A971FL, 0x35F1141CL, 0x26A1E7E8L, 0xD4CA64EBL, | ||
67 | 0x8AD958CFL, 0x78B2DBCCL, 0x6BE22838L, 0x9989AB3BL, | ||
68 | 0x4D43CFD0L, 0xBF284CD3L, 0xAC78BF27L, 0x5E133C24L, | ||
69 | 0x105EC76FL, 0xE235446CL, 0xF165B798L, 0x030E349BL, | ||
70 | 0xD7C45070L, 0x25AFD373L, 0x36FF2087L, 0xC494A384L, | ||
71 | 0x9A879FA0L, 0x68EC1CA3L, 0x7BBCEF57L, 0x89D76C54L, | ||
72 | 0x5D1D08BFL, 0xAF768BBCL, 0xBC267848L, 0x4E4DFB4BL, | ||
73 | 0x20BD8EDEL, 0xD2D60DDDL, 0xC186FE29L, 0x33ED7D2AL, | ||
74 | 0xE72719C1L, 0x154C9AC2L, 0x061C6936L, 0xF477EA35L, | ||
75 | 0xAA64D611L, 0x580F5512L, 0x4B5FA6E6L, 0xB93425E5L, | ||
76 | 0x6DFE410EL, 0x9F95C20DL, 0x8CC531F9L, 0x7EAEB2FAL, | ||
77 | 0x30E349B1L, 0xC288CAB2L, 0xD1D83946L, 0x23B3BA45L, | ||
78 | 0xF779DEAEL, 0x05125DADL, 0x1642AE59L, 0xE4292D5AL, | ||
79 | 0xBA3A117EL, 0x4851927DL, 0x5B016189L, 0xA96AE28AL, | ||
80 | 0x7DA08661L, 0x8FCB0562L, 0x9C9BF696L, 0x6EF07595L, | ||
81 | 0x417B1DBCL, 0xB3109EBFL, 0xA0406D4BL, 0x522BEE48L, | ||
82 | 0x86E18AA3L, 0x748A09A0L, 0x67DAFA54L, 0x95B17957L, | ||
83 | 0xCBA24573L, 0x39C9C670L, 0x2A993584L, 0xD8F2B687L, | ||
84 | 0x0C38D26CL, 0xFE53516FL, 0xED03A29BL, 0x1F682198L, | ||
85 | 0x5125DAD3L, 0xA34E59D0L, 0xB01EAA24L, 0x42752927L, | ||
86 | 0x96BF4DCCL, 0x64D4CECFL, 0x77843D3BL, 0x85EFBE38L, | ||
87 | 0xDBFC821CL, 0x2997011FL, 0x3AC7F2EBL, 0xC8AC71E8L, | ||
88 | 0x1C661503L, 0xEE0D9600L, 0xFD5D65F4L, 0x0F36E6F7L, | ||
89 | 0x61C69362L, 0x93AD1061L, 0x80FDE395L, 0x72966096L, | ||
90 | 0xA65C047DL, 0x5437877EL, 0x4767748AL, 0xB50CF789L, | ||
91 | 0xEB1FCBADL, 0x197448AEL, 0x0A24BB5AL, 0xF84F3859L, | ||
92 | 0x2C855CB2L, 0xDEEEDFB1L, 0xCDBE2C45L, 0x3FD5AF46L, | ||
93 | 0x7198540DL, 0x83F3D70EL, 0x90A324FAL, 0x62C8A7F9L, | ||
94 | 0xB602C312L, 0x44694011L, 0x5739B3E5L, 0xA55230E6L, | ||
95 | 0xFB410CC2L, 0x092A8FC1L, 0x1A7A7C35L, 0xE811FF36L, | ||
96 | 0x3CDB9BDDL, 0xCEB018DEL, 0xDDE0EB2AL, 0x2F8B6829L, | ||
97 | 0x82F63B78L, 0x709DB87BL, 0x63CD4B8FL, 0x91A6C88CL, | ||
98 | 0x456CAC67L, 0xB7072F64L, 0xA457DC90L, 0x563C5F93L, | ||
99 | 0x082F63B7L, 0xFA44E0B4L, 0xE9141340L, 0x1B7F9043L, | ||
100 | 0xCFB5F4A8L, 0x3DDE77ABL, 0x2E8E845FL, 0xDCE5075CL, | ||
101 | 0x92A8FC17L, 0x60C37F14L, 0x73938CE0L, 0x81F80FE3L, | ||
102 | 0x55326B08L, 0xA759E80BL, 0xB4091BFFL, 0x466298FCL, | ||
103 | 0x1871A4D8L, 0xEA1A27DBL, 0xF94AD42FL, 0x0B21572CL, | ||
104 | 0xDFEB33C7L, 0x2D80B0C4L, 0x3ED04330L, 0xCCBBC033L, | ||
105 | 0xA24BB5A6L, 0x502036A5L, 0x4370C551L, 0xB11B4652L, | ||
106 | 0x65D122B9L, 0x97BAA1BAL, 0x84EA524EL, 0x7681D14DL, | ||
107 | 0x2892ED69L, 0xDAF96E6AL, 0xC9A99D9EL, 0x3BC21E9DL, | ||
108 | 0xEF087A76L, 0x1D63F975L, 0x0E330A81L, 0xFC588982L, | ||
109 | 0xB21572C9L, 0x407EF1CAL, 0x532E023EL, 0xA145813DL, | ||
110 | 0x758FE5D6L, 0x87E466D5L, 0x94B49521L, 0x66DF1622L, | ||
111 | 0x38CC2A06L, 0xCAA7A905L, 0xD9F75AF1L, 0x2B9CD9F2L, | ||
112 | 0xFF56BD19L, 0x0D3D3E1AL, 0x1E6DCDEEL, 0xEC064EEDL, | ||
113 | 0xC38D26C4L, 0x31E6A5C7L, 0x22B65633L, 0xD0DDD530L, | ||
114 | 0x0417B1DBL, 0xF67C32D8L, 0xE52CC12CL, 0x1747422FL, | ||
115 | 0x49547E0BL, 0xBB3FFD08L, 0xA86F0EFCL, 0x5A048DFFL, | ||
116 | 0x8ECEE914L, 0x7CA56A17L, 0x6FF599E3L, 0x9D9E1AE0L, | ||
117 | 0xD3D3E1ABL, 0x21B862A8L, 0x32E8915CL, 0xC083125FL, | ||
118 | 0x144976B4L, 0xE622F5B7L, 0xF5720643L, 0x07198540L, | ||
119 | 0x590AB964L, 0xAB613A67L, 0xB831C993L, 0x4A5A4A90L, | ||
120 | 0x9E902E7BL, 0x6CFBAD78L, 0x7FAB5E8CL, 0x8DC0DD8FL, | ||
121 | 0xE330A81AL, 0x115B2B19L, 0x020BD8EDL, 0xF0605BEEL, | ||
122 | 0x24AA3F05L, 0xD6C1BC06L, 0xC5914FF2L, 0x37FACCF1L, | ||
123 | 0x69E9F0D5L, 0x9B8273D6L, 0x88D28022L, 0x7AB90321L, | ||
124 | 0xAE7367CAL, 0x5C18E4C9L, 0x4F48173DL, 0xBD23943EL, | ||
125 | 0xF36E6F75L, 0x0105EC76L, 0x12551F82L, 0xE03E9C81L, | ||
126 | 0x34F4F86AL, 0xC69F7B69L, 0xD5CF889DL, 0x27A40B9EL, | ||
127 | 0x79B737BAL, 0x8BDCB4B9L, 0x988C474DL, 0x6AE7C44EL, | ||
128 | 0xBE2DA0A5L, 0x4C4623A6L, 0x5F16D052L, 0xAD7D5351L | ||
129 | }; | ||
130 | |||
131 | /* | ||
132 | * Steps through buffer one byte at at time, calculates reflected | ||
133 | * crc using table. | ||
134 | */ | ||
135 | |||
136 | static u32 crc32c(u32 crc, const u8 *data, unsigned int length) | ||
137 | { | ||
138 | while (length--) | ||
139 | crc = crc32c_table[(crc ^ *data++) & 0xFFL] ^ (crc >> 8); | ||
140 | |||
141 | return crc; | ||
142 | } | ||
143 | |||
144 | /* | ||
36 | * Steps through buffer one byte at at time, calculates reflected | 145 | * Steps through buffer one byte at at time, calculates reflected |
37 | * crc using table. | 146 | * crc using table. |
38 | */ | 147 | */ |