crypto/crc32c.c - third_party/linux - Git at Google

 /*
  * Cryptographic API.
  *
  * CRC32C chksum
  *
  *@Article{castagnoli-crc,
  * author =       { Guy Castagnoli and Stefan Braeuer and Martin Herrman},
  * title =        {{Optimization of Cyclic Redundancy-Check Codes with 24
  *                 and 32 Parity Bits}},
  * journal =      IEEE Transactions on Communication,
  * year =         {1993},
  * volume =       {41},
  * number =       {6},
  * pages =        {},
  * month =        {June},
  *}
  * Used by the iSCSI driver, possibly others, and derived from the
  * the iscsi-crc.c module of the linux-iscsi driver at
  * http://linux-iscsi.sourceforge.net.
  *
  * Following the example of lib/crc32, this function is intended to be
  * flexible and useful for all users.  Modules that currently have their
  * own crc32c, but hopefully may be able to use this one are:
  *  net/sctp (please add all your doco to here if you change to
  *            use this one!)
  *  <endoflist>
  *
  * Copyright (c) 2004 Cisco Systems, Inc.
  * Copyright (c) 2008 Herbert Xu <herbert@gondor.apana.org.au>
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License as published by the Free
  * Software Foundation; either version 2 of the License, or (at your option)
  * any later version.
  *
  */

 #include <crypto/internal/hash.h>
 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/string.h>
 #include <linux/kernel.h>

 #define CHKSUM_BLOCK_SIZE	1
 #define CHKSUM_DIGEST_SIZE	4

 struct chksum_ctx {
 	u32 key;
 };

 struct chksum_desc_ctx {
 	u32 crc;
 };

 /*
  * This is the CRC-32C table
  * Generated with:
  * width = 32 bits
  * poly = 0x1EDC6F41
  * reflect input bytes = true
  * reflect output bytes = true
  */

 static const u32 crc32c_table[256] = {
 	0x00000000L, 0xF26B8303L, 0xE13B70F7L, 0x1350F3F4L,
 	0xC79A971FL, 0x35F1141CL, 0x26A1E7E8L, 0xD4CA64EBL,
 	0x8AD958CFL, 0x78B2DBCCL, 0x6BE22838L, 0x9989AB3BL,
 	0x4D43CFD0L, 0xBF284CD3L, 0xAC78BF27L, 0x5E133C24L,
 	0x105EC76FL, 0xE235446CL, 0xF165B798L, 0x030E349BL,
 	0xD7C45070L, 0x25AFD373L, 0x36FF2087L, 0xC494A384L,
 	0x9A879FA0L, 0x68EC1CA3L, 0x7BBCEF57L, 0x89D76C54L,
 	0x5D1D08BFL, 0xAF768BBCL, 0xBC267848L, 0x4E4DFB4BL,
 	0x20BD8EDEL, 0xD2D60DDDL, 0xC186FE29L, 0x33ED7D2AL,
 	0xE72719C1L, 0x154C9AC2L, 0x061C6936L, 0xF477EA35L,
 	0xAA64D611L, 0x580F5512L, 0x4B5FA6E6L, 0xB93425E5L,
 	0x6DFE410EL, 0x9F95C20DL, 0x8CC531F9L, 0x7EAEB2FAL,
 	0x30E349B1L, 0xC288CAB2L, 0xD1D83946L, 0x23B3BA45L,
 	0xF779DEAEL, 0x05125DADL, 0x1642AE59L, 0xE4292D5AL,
 	0xBA3A117EL, 0x4851927DL, 0x5B016189L, 0xA96AE28AL,
 	0x7DA08661L, 0x8FCB0562L, 0x9C9BF696L, 0x6EF07595L,
 	0x417B1DBCL, 0xB3109EBFL, 0xA0406D4BL, 0x522BEE48L,
 	0x86E18AA3L, 0x748A09A0L, 0x67DAFA54L, 0x95B17957L,
 	0xCBA24573L, 0x39C9C670L, 0x2A993584L, 0xD8F2B687L,
 	0x0C38D26CL, 0xFE53516FL, 0xED03A29BL, 0x1F682198L,
 	0x5125DAD3L, 0xA34E59D0L, 0xB01EAA24L, 0x42752927L,
 	0x96BF4DCCL, 0x64D4CECFL, 0x77843D3BL, 0x85EFBE38L,
 	0xDBFC821CL, 0x2997011FL, 0x3AC7F2EBL, 0xC8AC71E8L,
 	0x1C661503L, 0xEE0D9600L, 0xFD5D65F4L, 0x0F36E6F7L,
 	0x61C69362L, 0x93AD1061L, 0x80FDE395L, 0x72966096L,
 	0xA65C047DL, 0x5437877EL, 0x4767748AL, 0xB50CF789L,
 	0xEB1FCBADL, 0x197448AEL, 0x0A24BB5AL, 0xF84F3859L,
 	0x2C855CB2L, 0xDEEEDFB1L, 0xCDBE2C45L, 0x3FD5AF46L,
 	0x7198540DL, 0x83F3D70EL, 0x90A324FAL, 0x62C8A7F9L,
 	0xB602C312L, 0x44694011L, 0x5739B3E5L, 0xA55230E6L,
 	0xFB410CC2L, 0x092A8FC1L, 0x1A7A7C35L, 0xE811FF36L,
 	0x3CDB9BDDL, 0xCEB018DEL, 0xDDE0EB2AL, 0x2F8B6829L,
 	0x82F63B78L, 0x709DB87BL, 0x63CD4B8FL, 0x91A6C88CL,
 	0x456CAC67L, 0xB7072F64L, 0xA457DC90L, 0x563C5F93L,
 	0x082F63B7L, 0xFA44E0B4L, 0xE9141340L, 0x1B7F9043L,
 	0xCFB5F4A8L, 0x3DDE77ABL, 0x2E8E845FL, 0xDCE5075CL,
 	0x92A8FC17L, 0x60C37F14L, 0x73938CE0L, 0x81F80FE3L,
 	0x55326B08L, 0xA759E80BL, 0xB4091BFFL, 0x466298FCL,
 	0x1871A4D8L, 0xEA1A27DBL, 0xF94AD42FL, 0x0B21572CL,
 	0xDFEB33C7L, 0x2D80B0C4L, 0x3ED04330L, 0xCCBBC033L,
 	0xA24BB5A6L, 0x502036A5L, 0x4370C551L, 0xB11B4652L,
 	0x65D122B9L, 0x97BAA1BAL, 0x84EA524EL, 0x7681D14DL,
 	0x2892ED69L, 0xDAF96E6AL, 0xC9A99D9EL, 0x3BC21E9DL,
 	0xEF087A76L, 0x1D63F975L, 0x0E330A81L, 0xFC588982L,
 	0xB21572C9L, 0x407EF1CAL, 0x532E023EL, 0xA145813DL,
 	0x758FE5D6L, 0x87E466D5L, 0x94B49521L, 0x66DF1622L,
 	0x38CC2A06L, 0xCAA7A905L, 0xD9F75AF1L, 0x2B9CD9F2L,
 	0xFF56BD19L, 0x0D3D3E1AL, 0x1E6DCDEEL, 0xEC064EEDL,
 	0xC38D26C4L, 0x31E6A5C7L, 0x22B65633L, 0xD0DDD530L,
 	0x0417B1DBL, 0xF67C32D8L, 0xE52CC12CL, 0x1747422FL,
 	0x49547E0BL, 0xBB3FFD08L, 0xA86F0EFCL, 0x5A048DFFL,
 	0x8ECEE914L, 0x7CA56A17L, 0x6FF599E3L, 0x9D9E1AE0L,
 	0xD3D3E1ABL, 0x21B862A8L, 0x32E8915CL, 0xC083125FL,
 	0x144976B4L, 0xE622F5B7L, 0xF5720643L, 0x07198540L,
 	0x590AB964L, 0xAB613A67L, 0xB831C993L, 0x4A5A4A90L,
 	0x9E902E7BL, 0x6CFBAD78L, 0x7FAB5E8CL, 0x8DC0DD8FL,
 	0xE330A81AL, 0x115B2B19L, 0x020BD8EDL, 0xF0605BEEL,
 	0x24AA3F05L, 0xD6C1BC06L, 0xC5914FF2L, 0x37FACCF1L,
 	0x69E9F0D5L, 0x9B8273D6L, 0x88D28022L, 0x7AB90321L,
 	0xAE7367CAL, 0x5C18E4C9L, 0x4F48173DL, 0xBD23943EL,
 	0xF36E6F75L, 0x0105EC76L, 0x12551F82L, 0xE03E9C81L,
 	0x34F4F86AL, 0xC69F7B69L, 0xD5CF889DL, 0x27A40B9EL,
 	0x79B737BAL, 0x8BDCB4B9L, 0x988C474DL, 0x6AE7C44EL,
 	0xBE2DA0A5L, 0x4C4623A6L, 0x5F16D052L, 0xAD7D5351L
 };

 /*
  * Steps through buffer one byte at at time, calculates reflected
  * crc using table.
  */

 static u32 crc32c(u32 crc, const u8 *data, unsigned int length)
 {
 	while (length--)
 		crc = crc32c_table[(crc ^ *data++) & 0xFFL] ^ (crc >> 8);

 	return crc;
 }

 /*
  * Steps through buffer one byte at at time, calculates reflected
  * crc using table.
  */

 static int chksum_init(struct shash_desc *desc)
 {
 	struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm);
 	struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);

 	ctx->crc = mctx->key;

 	return 0;
 }

 /*
  * Setting the seed allows arbitrary accumulators and flexible XOR policy
  * If your algorithm starts with ~0, then XOR with ~0 before you set
  * the seed.
  */
 static int chksum_setkey(struct crypto_shash *tfm, const u8 *key,
 			 unsigned int keylen)
 {
 	struct chksum_ctx *mctx = crypto_shash_ctx(tfm);

 	if (keylen != sizeof(mctx->key)) {
 		crypto_shash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
 		return -EINVAL;
 	}
 	mctx->key = le32_to_cpu(*(__le32 *)key);
 	return 0;
 }

 static int chksum_update(struct shash_desc *desc, const u8 *data,
 			 unsigned int length)
 {
 	struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);

 	ctx->crc = crc32c(ctx->crc, data, length);
 	return 0;
 }

 static int chksum_final(struct shash_desc *desc, u8 *out)
 {
 	struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);

 	*(__le32 *)out = ~cpu_to_le32p(&ctx->crc);
 	return 0;
 }

 static int __chksum_finup(u32 *crcp, const u8 *data, unsigned int len, u8 *out)
 {
 	*(__le32 *)out = ~cpu_to_le32(crc32c(*crcp, data, len));
 	return 0;
 }

 static int chksum_finup(struct shash_desc *desc, const u8 *data,
 			unsigned int len, u8 *out)
 {
 	struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);

 	return __chksum_finup(&ctx->crc, data, len, out);
 }

 static int chksum_digest(struct shash_desc *desc, const u8 *data,
 			 unsigned int length, u8 *out)
 {
 	struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm);

 	return __chksum_finup(&mctx->key, data, length, out);
 }

 static int crc32c_cra_init(struct crypto_tfm *tfm)
 {
 	struct chksum_ctx *mctx = crypto_tfm_ctx(tfm);

 	mctx->key = ~0;
 	return 0;
 }

 static struct shash_alg alg = {
 	.digestsize		=	CHKSUM_DIGEST_SIZE,
 	.setkey			=	chksum_setkey,
 	.init		=	chksum_init,
 	.update		=	chksum_update,
 	.final		=	chksum_final,
 	.finup		=	chksum_finup,
 	.digest		=	chksum_digest,
 	.descsize		=	sizeof(struct chksum_desc_ctx),
 	.base			=	{
 		.cra_name		=	"crc32c",
 		.cra_driver_name	=	"crc32c-generic",
 		.cra_priority		=	100,
 		.cra_blocksize		=	CHKSUM_BLOCK_SIZE,
 		.cra_alignmask		=	3,
 		.cra_ctxsize		=	sizeof(struct chksum_ctx),
 		.cra_module		=	THIS_MODULE,
 		.cra_init		=	crc32c_cra_init,
 	}
 };

 static int __init crc32c_mod_init(void)
 {
 	return crypto_register_shash(&alg);
 }

 static void __exit crc32c_mod_fini(void)
 {
 	crypto_unregister_shash(&alg);
 }

 module_init(crc32c_mod_init);
 module_exit(crc32c_mod_fini);

 MODULE_AUTHOR("Clay Haapala <chaapala@cisco.com>");
 MODULE_DESCRIPTION("CRC32c (Castagnoli) calculations wrapper for lib/crc32c");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS_CRYPTO("crc32c");
	/*
	* Cryptographic API.
	*
	* CRC32C chksum
	*
	*@Article{castagnoli-crc,
	* author = { Guy Castagnoli and Stefan Braeuer and Martin Herrman},
	* title = {{Optimization of Cyclic Redundancy-Check Codes with 24
	* and 32 Parity Bits}},
	* journal = IEEE Transactions on Communication,
	* year = {1993},
	* volume = {41},
	* number = {6},
	* pages = {},
	* month = {June},
	*}
	* Used by the iSCSI driver, possibly others, and derived from the
	* the iscsi-crc.c module of the linux-iscsi driver at
	* http://linux-iscsi.sourceforge.net.
	*
	* Following the example of lib/crc32, this function is intended to be
	* flexible and useful for all users. Modules that currently have their
	* own crc32c, but hopefully may be able to use this one are:
	* net/sctp (please add all your doco to here if you change to
	* use this one!)
	* <endoflist>
	*
	* Copyright (c) 2004 Cisco Systems, Inc.
	* Copyright (c) 2008 Herbert Xu <herbert@gondor.apana.org.au>
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License as published by the Free
	* Software Foundation; either version 2 of the License, or (at your option)
	* any later version.
	*
	*/

	#include <crypto/internal/hash.h>
	#include <linux/init.h>
	#include <linux/module.h>
	#include <linux/string.h>
	#include <linux/kernel.h>

	#define CHKSUM_BLOCK_SIZE 1
	#define CHKSUM_DIGEST_SIZE 4

	struct chksum_ctx {
	u32 key;
	};

	struct chksum_desc_ctx {
	u32 crc;
	};

	/*
	* This is the CRC-32C table
	* Generated with:
	* width = 32 bits
	* poly = 0x1EDC6F41
	* reflect input bytes = true
	* reflect output bytes = true
	*/

	static const u32 crc32c_table[256] = {
	0x00000000L, 0xF26B8303L, 0xE13B70F7L, 0x1350F3F4L,
	0xC79A971FL, 0x35F1141CL, 0x26A1E7E8L, 0xD4CA64EBL,
	0x8AD958CFL, 0x78B2DBCCL, 0x6BE22838L, 0x9989AB3BL,
	0x4D43CFD0L, 0xBF284CD3L, 0xAC78BF27L, 0x5E133C24L,
	0x105EC76FL, 0xE235446CL, 0xF165B798L, 0x030E349BL,
	0xD7C45070L, 0x25AFD373L, 0x36FF2087L, 0xC494A384L,
	0x9A879FA0L, 0x68EC1CA3L, 0x7BBCEF57L, 0x89D76C54L,
	0x5D1D08BFL, 0xAF768BBCL, 0xBC267848L, 0x4E4DFB4BL,
	0x20BD8EDEL, 0xD2D60DDDL, 0xC186FE29L, 0x33ED7D2AL,
	0xE72719C1L, 0x154C9AC2L, 0x061C6936L, 0xF477EA35L,
	0xAA64D611L, 0x580F5512L, 0x4B5FA6E6L, 0xB93425E5L,
	0x6DFE410EL, 0x9F95C20DL, 0x8CC531F9L, 0x7EAEB2FAL,
	0x30E349B1L, 0xC288CAB2L, 0xD1D83946L, 0x23B3BA45L,
	0xF779DEAEL, 0x05125DADL, 0x1642AE59L, 0xE4292D5AL,
	0xBA3A117EL, 0x4851927DL, 0x5B016189L, 0xA96AE28AL,
	0x7DA08661L, 0x8FCB0562L, 0x9C9BF696L, 0x6EF07595L,
	0x417B1DBCL, 0xB3109EBFL, 0xA0406D4BL, 0x522BEE48L,
	0x86E18AA3L, 0x748A09A0L, 0x67DAFA54L, 0x95B17957L,
	0xCBA24573L, 0x39C9C670L, 0x2A993584L, 0xD8F2B687L,
	0x0C38D26CL, 0xFE53516FL, 0xED03A29BL, 0x1F682198L,
	0x5125DAD3L, 0xA34E59D0L, 0xB01EAA24L, 0x42752927L,
	0x96BF4DCCL, 0x64D4CECFL, 0x77843D3BL, 0x85EFBE38L,
	0xDBFC821CL, 0x2997011FL, 0x3AC7F2EBL, 0xC8AC71E8L,
	0x1C661503L, 0xEE0D9600L, 0xFD5D65F4L, 0x0F36E6F7L,
	0x61C69362L, 0x93AD1061L, 0x80FDE395L, 0x72966096L,
	0xA65C047DL, 0x5437877EL, 0x4767748AL, 0xB50CF789L,
	0xEB1FCBADL, 0x197448AEL, 0x0A24BB5AL, 0xF84F3859L,
	0x2C855CB2L, 0xDEEEDFB1L, 0xCDBE2C45L, 0x3FD5AF46L,
	0x7198540DL, 0x83F3D70EL, 0x90A324FAL, 0x62C8A7F9L,
	0xB602C312L, 0x44694011L, 0x5739B3E5L, 0xA55230E6L,
	0xFB410CC2L, 0x092A8FC1L, 0x1A7A7C35L, 0xE811FF36L,
	0x3CDB9BDDL, 0xCEB018DEL, 0xDDE0EB2AL, 0x2F8B6829L,
	0x82F63B78L, 0x709DB87BL, 0x63CD4B8FL, 0x91A6C88CL,
	0x456CAC67L, 0xB7072F64L, 0xA457DC90L, 0x563C5F93L,
	0x082F63B7L, 0xFA44E0B4L, 0xE9141340L, 0x1B7F9043L,
	0xCFB5F4A8L, 0x3DDE77ABL, 0x2E8E845FL, 0xDCE5075CL,
	0x92A8FC17L, 0x60C37F14L, 0x73938CE0L, 0x81F80FE3L,
	0x55326B08L, 0xA759E80BL, 0xB4091BFFL, 0x466298FCL,
	0x1871A4D8L, 0xEA1A27DBL, 0xF94AD42FL, 0x0B21572CL,
	0xDFEB33C7L, 0x2D80B0C4L, 0x3ED04330L, 0xCCBBC033L,
	0xA24BB5A6L, 0x502036A5L, 0x4370C551L, 0xB11B4652L,
	0x65D122B9L, 0x97BAA1BAL, 0x84EA524EL, 0x7681D14DL,
	0x2892ED69L, 0xDAF96E6AL, 0xC9A99D9EL, 0x3BC21E9DL,
	0xEF087A76L, 0x1D63F975L, 0x0E330A81L, 0xFC588982L,
	0xB21572C9L, 0x407EF1CAL, 0x532E023EL, 0xA145813DL,
	0x758FE5D6L, 0x87E466D5L, 0x94B49521L, 0x66DF1622L,
	0x38CC2A06L, 0xCAA7A905L, 0xD9F75AF1L, 0x2B9CD9F2L,
	0xFF56BD19L, 0x0D3D3E1AL, 0x1E6DCDEEL, 0xEC064EEDL,
	0xC38D26C4L, 0x31E6A5C7L, 0x22B65633L, 0xD0DDD530L,
	0x0417B1DBL, 0xF67C32D8L, 0xE52CC12CL, 0x1747422FL,
	0x49547E0BL, 0xBB3FFD08L, 0xA86F0EFCL, 0x5A048DFFL,
	0x8ECEE914L, 0x7CA56A17L, 0x6FF599E3L, 0x9D9E1AE0L,
	0xD3D3E1ABL, 0x21B862A8L, 0x32E8915CL, 0xC083125FL,
	0x144976B4L, 0xE622F5B7L, 0xF5720643L, 0x07198540L,
	0x590AB964L, 0xAB613A67L, 0xB831C993L, 0x4A5A4A90L,
	0x9E902E7BL, 0x6CFBAD78L, 0x7FAB5E8CL, 0x8DC0DD8FL,
	0xE330A81AL, 0x115B2B19L, 0x020BD8EDL, 0xF0605BEEL,
	0x24AA3F05L, 0xD6C1BC06L, 0xC5914FF2L, 0x37FACCF1L,
	0x69E9F0D5L, 0x9B8273D6L, 0x88D28022L, 0x7AB90321L,
	0xAE7367CAL, 0x5C18E4C9L, 0x4F48173DL, 0xBD23943EL,
	0xF36E6F75L, 0x0105EC76L, 0x12551F82L, 0xE03E9C81L,
	0x34F4F86AL, 0xC69F7B69L, 0xD5CF889DL, 0x27A40B9EL,
	0x79B737BAL, 0x8BDCB4B9L, 0x988C474DL, 0x6AE7C44EL,
	0xBE2DA0A5L, 0x4C4623A6L, 0x5F16D052L, 0xAD7D5351L
	};

	/*
	* Steps through buffer one byte at at time, calculates reflected
	* crc using table.
	*/

	static u32 crc32c(u32 crc, const u8 *data, unsigned int length)
	{
	while (length--)
	crc = crc32c_table[(crc ^ *data++) & 0xFFL] ^ (crc >> 8);

	return crc;
	}

	/*
	* Steps through buffer one byte at at time, calculates reflected
	* crc using table.
	*/

	static int chksum_init(struct shash_desc *desc)
	{
	struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm);
	struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);

	ctx->crc = mctx->key;

	return 0;
	}

	/*
	* Setting the seed allows arbitrary accumulators and flexible XOR policy
	* If your algorithm starts with ~0, then XOR with ~0 before you set
	* the seed.
	*/
	static int chksum_setkey(struct crypto_shash tfm, const u8 key,
	unsigned int keylen)
	{
	struct chksum_ctx *mctx = crypto_shash_ctx(tfm);

	if (keylen != sizeof(mctx->key)) {
	crypto_shash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
	return -EINVAL;
	}
	mctx->key = le32_to_cpu((__le32 )key);
	return 0;
	}

	static int chksum_update(struct shash_desc desc, const u8 data,
	unsigned int length)
	{
	struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);

	ctx->crc = crc32c(ctx->crc, data, length);
	return 0;
	}

	static int chksum_final(struct shash_desc desc, u8 out)
	{
	struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);

	(__le32 )out = ~cpu_to_le32p(&ctx->crc);
	return 0;
	}

	static int __chksum_finup(u32 crcp, const u8 data, unsigned int len, u8 *out)
	{
	(__le32 )out = ~cpu_to_le32(crc32c(*crcp, data, len));
	return 0;
	}

	static int chksum_finup(struct shash_desc desc, const u8 data,
	unsigned int len, u8 *out)
	{
	struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);

	return __chksum_finup(&ctx->crc, data, len, out);
	}

	static int chksum_digest(struct shash_desc desc, const u8 data,
	unsigned int length, u8 *out)
	{
	struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm);

	return __chksum_finup(&mctx->key, data, length, out);
	}

	static int crc32c_cra_init(struct crypto_tfm *tfm)
	{
	struct chksum_ctx *mctx = crypto_tfm_ctx(tfm);

	mctx->key = ~0;
	return 0;
	}

	static struct shash_alg alg = {
	.digestsize = CHKSUM_DIGEST_SIZE,
	.setkey = chksum_setkey,
	.init = chksum_init,
	.update = chksum_update,
	.final = chksum_final,
	.finup = chksum_finup,
	.digest = chksum_digest,
	.descsize = sizeof(struct chksum_desc_ctx),
	.base = {
	.cra_name = "crc32c",
	.cra_driver_name = "crc32c-generic",
	.cra_priority = 100,
	.cra_blocksize = CHKSUM_BLOCK_SIZE,
	.cra_alignmask = 3,
	.cra_ctxsize = sizeof(struct chksum_ctx),
	.cra_module = THIS_MODULE,
	.cra_init = crc32c_cra_init,
	}
	};

	static int __init crc32c_mod_init(void)
	{
	return crypto_register_shash(&alg);
	}

	static void __exit crc32c_mod_fini(void)
	{
	crypto_unregister_shash(&alg);
	}

	module_init(crc32c_mod_init);
	module_exit(crc32c_mod_fini);

	MODULE_AUTHOR("Clay Haapala <chaapala@cisco.com>");
	MODULE_DESCRIPTION("CRC32c (Castagnoli) calculations wrapper for lib/crc32c");
	MODULE_LICENSE("GPL");
	MODULE_ALIAS_CRYPTO("crc32c");