arch/x86/crypto/des3_ede_glue.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Glue Code for assembler optimized version of 3DES
  *
  * Copyright © 2014 Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
  *
  * CBC & ECB parts based on code (crypto/cbc.c,ecb.c) by:
  *   Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
  */

 #include <crypto/algapi.h>
 #include <crypto/des.h>
 #include <crypto/internal/skcipher.h>
 #include <linux/crypto.h>
 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/types.h>

 struct des3_ede_x86_ctx {
 	struct des3_ede_ctx enc;
 	struct des3_ede_ctx dec;
 };

 /* regular block cipher functions */
 asmlinkage void des3_ede_x86_64_crypt_blk(const u32 *expkey, u8 *dst,
 					  const u8 *src);

 /* 3-way parallel cipher functions */
 asmlinkage void des3_ede_x86_64_crypt_blk_3way(const u32 *expkey, u8 *dst,
 					       const u8 *src);

 static inline void des3_ede_enc_blk(struct des3_ede_x86_ctx *ctx, u8 *dst,
 				    const u8 *src)
 {
 	u32 *enc_ctx = ctx->enc.expkey;

 	des3_ede_x86_64_crypt_blk(enc_ctx, dst, src);
 }

 static inline void des3_ede_dec_blk(struct des3_ede_x86_ctx *ctx, u8 *dst,
 				    const u8 *src)
 {
 	u32 *dec_ctx = ctx->dec.expkey;

 	des3_ede_x86_64_crypt_blk(dec_ctx, dst, src);
 }

 static inline void des3_ede_dec_blk_3way(struct des3_ede_x86_ctx *ctx, u8 *dst,
 					 const u8 *src)
 {
 	u32 *dec_ctx = ctx->dec.expkey;

 	des3_ede_x86_64_crypt_blk_3way(dec_ctx, dst, src);
 }

 static void des3_ede_x86_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
 {
 	des3_ede_enc_blk(crypto_tfm_ctx(tfm), dst, src);
 }

 static void des3_ede_x86_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
 {
 	des3_ede_dec_blk(crypto_tfm_ctx(tfm), dst, src);
 }

 static int ecb_crypt(struct skcipher_request *req, const u32 *expkey)
 {
 	const unsigned int bsize = DES3_EDE_BLOCK_SIZE;
 	struct skcipher_walk walk;
 	unsigned int nbytes;
 	int err;

 	err = skcipher_walk_virt(&walk, req, false);

 	while ((nbytes = walk.nbytes)) {
 		u8 *wsrc = walk.src.virt.addr;
 		u8 *wdst = walk.dst.virt.addr;

 		/* Process four block batch */
 		if (nbytes >= bsize * 3) {
 			do {
 				des3_ede_x86_64_crypt_blk_3way(expkey, wdst,
 							       wsrc);

 				wsrc += bsize * 3;
 				wdst += bsize * 3;
 				nbytes -= bsize * 3;
 			} while (nbytes >= bsize * 3);

 			if (nbytes < bsize)
 				goto done;
 		}

 		/* Handle leftovers */
 		do {
 			des3_ede_x86_64_crypt_blk(expkey, wdst, wsrc);

 			wsrc += bsize;
 			wdst += bsize;
 			nbytes -= bsize;
 		} while (nbytes >= bsize);

 done:
 		err = skcipher_walk_done(&walk, nbytes);
 	}

 	return err;
 }

 static int ecb_encrypt(struct skcipher_request *req)
 {
 	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
 	struct des3_ede_x86_ctx *ctx = crypto_skcipher_ctx(tfm);

 	return ecb_crypt(req, ctx->enc.expkey);
 }

 static int ecb_decrypt(struct skcipher_request *req)
 {
 	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
 	struct des3_ede_x86_ctx *ctx = crypto_skcipher_ctx(tfm);

 	return ecb_crypt(req, ctx->dec.expkey);
 }

 static unsigned int __cbc_encrypt(struct des3_ede_x86_ctx *ctx,
 				  struct skcipher_walk *walk)
 {
 	unsigned int bsize = DES3_EDE_BLOCK_SIZE;
 	unsigned int nbytes = walk->nbytes;
 	u64 *src = (u64 *)walk->src.virt.addr;
 	u64 *dst = (u64 *)walk->dst.virt.addr;
 	u64 *iv = (u64 *)walk->iv;

 	do {
 		*dst = *src ^ *iv;
 		des3_ede_enc_blk(ctx, (u8 *)dst, (u8 *)dst);
 		iv = dst;

 		src += 1;
 		dst += 1;
 		nbytes -= bsize;
 	} while (nbytes >= bsize);

 	*(u64 *)walk->iv = *iv;
 	return nbytes;
 }

 static int cbc_encrypt(struct skcipher_request *req)
 {
 	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
 	struct des3_ede_x86_ctx *ctx = crypto_skcipher_ctx(tfm);
 	struct skcipher_walk walk;
 	unsigned int nbytes;
 	int err;

 	err = skcipher_walk_virt(&walk, req, false);

 	while (walk.nbytes) {
 		nbytes = __cbc_encrypt(ctx, &walk);
 		err = skcipher_walk_done(&walk, nbytes);
 	}

 	return err;
 }

 static unsigned int __cbc_decrypt(struct des3_ede_x86_ctx *ctx,
 				  struct skcipher_walk *walk)
 {
 	unsigned int bsize = DES3_EDE_BLOCK_SIZE;
 	unsigned int nbytes = walk->nbytes;
 	u64 *src = (u64 *)walk->src.virt.addr;
 	u64 *dst = (u64 *)walk->dst.virt.addr;
 	u64 ivs[3 - 1];
 	u64 last_iv;

 	/* Start of the last block. */
 	src += nbytes / bsize - 1;
 	dst += nbytes / bsize - 1;

 	last_iv = *src;

 	/* Process four block batch */
 	if (nbytes >= bsize * 3) {
 		do {
 			nbytes -= bsize * 3 - bsize;
 			src -= 3 - 1;
 			dst -= 3 - 1;

 			ivs[0] = src[0];
 			ivs[1] = src[1];

 			des3_ede_dec_blk_3way(ctx, (u8 *)dst, (u8 *)src);

 			dst[1] ^= ivs[0];
 			dst[2] ^= ivs[1];

 			nbytes -= bsize;
 			if (nbytes < bsize)
 				goto done;

 			*dst ^= *(src - 1);
 			src -= 1;
 			dst -= 1;
 		} while (nbytes >= bsize * 3);
 	}

 	/* Handle leftovers */
 	for (;;) {
 		des3_ede_dec_blk(ctx, (u8 *)dst, (u8 *)src);

 		nbytes -= bsize;
 		if (nbytes < bsize)
 			break;

 		*dst ^= *(src - 1);
 		src -= 1;
 		dst -= 1;
 	}

 done:
 	*dst ^= *(u64 *)walk->iv;
 	*(u64 *)walk->iv = last_iv;

 	return nbytes;
 }

 static int cbc_decrypt(struct skcipher_request *req)
 {
 	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
 	struct des3_ede_x86_ctx *ctx = crypto_skcipher_ctx(tfm);
 	struct skcipher_walk walk;
 	unsigned int nbytes;
 	int err;

 	err = skcipher_walk_virt(&walk, req, false);

 	while (walk.nbytes) {
 		nbytes = __cbc_decrypt(ctx, &walk);
 		err = skcipher_walk_done(&walk, nbytes);
 	}

 	return err;
 }

 static int des3_ede_x86_setkey(struct crypto_tfm *tfm, const u8 *key,
 			       unsigned int keylen)
 {
 	struct des3_ede_x86_ctx *ctx = crypto_tfm_ctx(tfm);
 	u32 i, j, tmp;
 	int err;

 	err = des3_ede_expand_key(&ctx->enc, key, keylen);
 	if (err == -ENOKEY) {
 		if (crypto_tfm_get_flags(tfm) & CRYPTO_TFM_REQ_FORBID_WEAK_KEYS)
 			err = -EINVAL;
 		else
 			err = 0;
 	}

 	if (err) {
 		memset(ctx, 0, sizeof(*ctx));
 		return err;
 	}

 	/* Fix encryption context for this implementation and form decryption
 	 * context. */
 	j = DES3_EDE_EXPKEY_WORDS - 2;
 	for (i = 0; i < DES3_EDE_EXPKEY_WORDS; i += 2, j -= 2) {
 		tmp = ror32(ctx->enc.expkey[i + 1], 4);
 		ctx->enc.expkey[i + 1] = tmp;

 		ctx->dec.expkey[j + 0] = ctx->enc.expkey[i + 0];
 		ctx->dec.expkey[j + 1] = tmp;
 	}

 	return 0;
 }

 static int des3_ede_x86_setkey_skcipher(struct crypto_skcipher *tfm,
 					const u8 *key,
 					unsigned int keylen)
 {
 	return des3_ede_x86_setkey(&tfm->base, key, keylen);
 }

 static struct crypto_alg des3_ede_cipher = {
 	.cra_name		= "des3_ede",
 	.cra_driver_name	= "des3_ede-asm",
 	.cra_priority		= 200,
 	.cra_flags		= CRYPTO_ALG_TYPE_CIPHER,
 	.cra_blocksize		= DES3_EDE_BLOCK_SIZE,
 	.cra_ctxsize		= sizeof(struct des3_ede_x86_ctx),
 	.cra_alignmask		= 0,
 	.cra_module		= THIS_MODULE,
 	.cra_u = {
 		.cipher = {
 			.cia_min_keysize	= DES3_EDE_KEY_SIZE,
 			.cia_max_keysize	= DES3_EDE_KEY_SIZE,
 			.cia_setkey		= des3_ede_x86_setkey,
 			.cia_encrypt		= des3_ede_x86_encrypt,
 			.cia_decrypt		= des3_ede_x86_decrypt,
 		}
 	}
 };

 static struct skcipher_alg des3_ede_skciphers[] = {
 	{
 		.base.cra_name		= "ecb(des3_ede)",
 		.base.cra_driver_name	= "ecb-des3_ede-asm",
 		.base.cra_priority	= 300,
 		.base.cra_blocksize	= DES3_EDE_BLOCK_SIZE,
 		.base.cra_ctxsize	= sizeof(struct des3_ede_x86_ctx),
 		.base.cra_module	= THIS_MODULE,
 		.min_keysize		= DES3_EDE_KEY_SIZE,
 		.max_keysize		= DES3_EDE_KEY_SIZE,
 		.setkey			= des3_ede_x86_setkey_skcipher,
 		.encrypt		= ecb_encrypt,
 		.decrypt		= ecb_decrypt,
 	}, {
 		.base.cra_name		= "cbc(des3_ede)",
 		.base.cra_driver_name	= "cbc-des3_ede-asm",
 		.base.cra_priority	= 300,
 		.base.cra_blocksize	= DES3_EDE_BLOCK_SIZE,
 		.base.cra_ctxsize	= sizeof(struct des3_ede_x86_ctx),
 		.base.cra_module	= THIS_MODULE,
 		.min_keysize		= DES3_EDE_KEY_SIZE,
 		.max_keysize		= DES3_EDE_KEY_SIZE,
 		.ivsize			= DES3_EDE_BLOCK_SIZE,
 		.setkey			= des3_ede_x86_setkey_skcipher,
 		.encrypt		= cbc_encrypt,
 		.decrypt		= cbc_decrypt,
 	}
 };

 static bool is_blacklisted_cpu(void)
 {
 	if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL)
 		return false;

 	if (boot_cpu_data.x86 == 0x0f) {
 		/*
 		 * On Pentium 4, des3_ede-x86_64 is slower than generic C
 		 * implementation because use of 64bit rotates (which are really
 		 * slow on P4). Therefore blacklist P4s.
 		 */
 		return true;
 	}

 	return false;
 }

 static int force;
 module_param(force, int, 0);
 MODULE_PARM_DESC(force, "Force module load, ignore CPU blacklist");

 static int __init des3_ede_x86_init(void)
 {
 	int err;

 	if (!force && is_blacklisted_cpu()) {
 		pr_info("des3_ede-x86_64: performance on this CPU would be suboptimal: disabling des3_ede-x86_64.\n");
 		return -ENODEV;
 	}

 	err = crypto_register_alg(&des3_ede_cipher);
 	if (err)
 		return err;

 	err = crypto_register_skciphers(des3_ede_skciphers,
 					ARRAY_SIZE(des3_ede_skciphers));
 	if (err)
 		crypto_unregister_alg(&des3_ede_cipher);

 	return err;
 }

 static void __exit des3_ede_x86_fini(void)
 {
 	crypto_unregister_alg(&des3_ede_cipher);
 	crypto_unregister_skciphers(des3_ede_skciphers,
 				    ARRAY_SIZE(des3_ede_skciphers));
 }

 module_init(des3_ede_x86_init);
 module_exit(des3_ede_x86_fini);

 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("Triple DES EDE Cipher Algorithm, asm optimized");
 MODULE_ALIAS_CRYPTO("des3_ede");
 MODULE_ALIAS_CRYPTO("des3_ede-asm");
 MODULE_AUTHOR("Jussi Kivilinna <jussi.kivilinna@iki.fi>");
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* Glue Code for assembler optimized version of 3DES
	*
	* Copyright © 2014 Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
	*
	* CBC & ECB parts based on code (crypto/cbc.c,ecb.c) by:
	* Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
	*/

	#include <crypto/algapi.h>
	#include <crypto/des.h>
	#include <crypto/internal/skcipher.h>
	#include <linux/crypto.h>
	#include <linux/init.h>
	#include <linux/module.h>
	#include <linux/types.h>

	struct des3_ede_x86_ctx {
	struct des3_ede_ctx enc;
	struct des3_ede_ctx dec;
	};

	/* regular block cipher functions */
	asmlinkage void des3_ede_x86_64_crypt_blk(const u32 expkey, u8 dst,
	const u8 *src);

	/* 3-way parallel cipher functions */
	asmlinkage void des3_ede_x86_64_crypt_blk_3way(const u32 expkey, u8 dst,
	const u8 *src);

	static inline void des3_ede_enc_blk(struct des3_ede_x86_ctx ctx, u8 dst,
	const u8 *src)
	{
	u32 *enc_ctx = ctx->enc.expkey;

	des3_ede_x86_64_crypt_blk(enc_ctx, dst, src);
	}

	static inline void des3_ede_dec_blk(struct des3_ede_x86_ctx ctx, u8 dst,
	const u8 *src)
	{
	u32 *dec_ctx = ctx->dec.expkey;

	des3_ede_x86_64_crypt_blk(dec_ctx, dst, src);
	}

	static inline void des3_ede_dec_blk_3way(struct des3_ede_x86_ctx ctx, u8 dst,
	const u8 *src)
	{
	u32 *dec_ctx = ctx->dec.expkey;

	des3_ede_x86_64_crypt_blk_3way(dec_ctx, dst, src);
	}

	static void des3_ede_x86_encrypt(struct crypto_tfm tfm, u8 dst, const u8 *src)
	{
	des3_ede_enc_blk(crypto_tfm_ctx(tfm), dst, src);
	}

	static void des3_ede_x86_decrypt(struct crypto_tfm tfm, u8 dst, const u8 *src)
	{
	des3_ede_dec_blk(crypto_tfm_ctx(tfm), dst, src);
	}

	static int ecb_crypt(struct skcipher_request req, const u32 expkey)
	{
	const unsigned int bsize = DES3_EDE_BLOCK_SIZE;
	struct skcipher_walk walk;
	unsigned int nbytes;
	int err;

	err = skcipher_walk_virt(&walk, req, false);

	while ((nbytes = walk.nbytes)) {
	u8 *wsrc = walk.src.virt.addr;
	u8 *wdst = walk.dst.virt.addr;

	/* Process four block batch */
	if (nbytes >= bsize * 3) {
	do {
	des3_ede_x86_64_crypt_blk_3way(expkey, wdst,
	wsrc);

	wsrc += bsize * 3;
	wdst += bsize * 3;
	nbytes -= bsize * 3;
	} while (nbytes >= bsize * 3);

	if (nbytes < bsize)
	goto done;
	}

	/* Handle leftovers */
	do {
	des3_ede_x86_64_crypt_blk(expkey, wdst, wsrc);

	wsrc += bsize;
	wdst += bsize;
	nbytes -= bsize;
	} while (nbytes >= bsize);

	done:
	err = skcipher_walk_done(&walk, nbytes);
	}

	return err;
	}

	static int ecb_encrypt(struct skcipher_request *req)
	{
	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
	struct des3_ede_x86_ctx *ctx = crypto_skcipher_ctx(tfm);

	return ecb_crypt(req, ctx->enc.expkey);
	}

	static int ecb_decrypt(struct skcipher_request *req)
	{
	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
	struct des3_ede_x86_ctx *ctx = crypto_skcipher_ctx(tfm);

	return ecb_crypt(req, ctx->dec.expkey);
	}

	static unsigned int __cbc_encrypt(struct des3_ede_x86_ctx *ctx,
	struct skcipher_walk *walk)
	{
	unsigned int bsize = DES3_EDE_BLOCK_SIZE;
	unsigned int nbytes = walk->nbytes;
	u64 src = (u64 )walk->src.virt.addr;
	u64 dst = (u64 )walk->dst.virt.addr;
	u64 iv = (u64 )walk->iv;

	do {
	dst = src ^ *iv;
	des3_ede_enc_blk(ctx, (u8 )dst, (u8 )dst);
	iv = dst;

	src += 1;
	dst += 1;
	nbytes -= bsize;
	} while (nbytes >= bsize);

	(u64 )walk->iv = *iv;
	return nbytes;
	}

	static int cbc_encrypt(struct skcipher_request *req)
	{
	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
	struct des3_ede_x86_ctx *ctx = crypto_skcipher_ctx(tfm);
	struct skcipher_walk walk;
	unsigned int nbytes;
	int err;

	err = skcipher_walk_virt(&walk, req, false);

	while (walk.nbytes) {
	nbytes = __cbc_encrypt(ctx, &walk);
	err = skcipher_walk_done(&walk, nbytes);
	}

	return err;
	}

	static unsigned int __cbc_decrypt(struct des3_ede_x86_ctx *ctx,
	struct skcipher_walk *walk)
	{
	unsigned int bsize = DES3_EDE_BLOCK_SIZE;
	unsigned int nbytes = walk->nbytes;
	u64 src = (u64 )walk->src.virt.addr;
	u64 dst = (u64 )walk->dst.virt.addr;
	u64 ivs[3 - 1];
	u64 last_iv;

	/* Start of the last block. */
	src += nbytes / bsize - 1;
	dst += nbytes / bsize - 1;

	last_iv = *src;

	/* Process four block batch */
	if (nbytes >= bsize * 3) {
	do {
	nbytes -= bsize * 3 - bsize;
	src -= 3 - 1;
	dst -= 3 - 1;

	ivs[0] = src[0];
	ivs[1] = src[1];

	des3_ede_dec_blk_3way(ctx, (u8 )dst, (u8 )src);

	dst[1] ^= ivs[0];
	dst[2] ^= ivs[1];

	nbytes -= bsize;
	if (nbytes < bsize)
	goto done;

	dst ^= (src - 1);
	src -= 1;
	dst -= 1;
	} while (nbytes >= bsize * 3);
	}

	/* Handle leftovers */
	for (;;) {
	des3_ede_dec_blk(ctx, (u8 )dst, (u8 )src);

	nbytes -= bsize;
	if (nbytes < bsize)
	break;

	dst ^= (src - 1);
	src -= 1;
	dst -= 1;
	}

	done:
	dst ^= (u64 *)walk->iv;
	(u64 )walk->iv = last_iv;

	return nbytes;
	}

	static int cbc_decrypt(struct skcipher_request *req)
	{
	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
	struct des3_ede_x86_ctx *ctx = crypto_skcipher_ctx(tfm);
	struct skcipher_walk walk;
	unsigned int nbytes;
	int err;

	err = skcipher_walk_virt(&walk, req, false);

	while (walk.nbytes) {
	nbytes = __cbc_decrypt(ctx, &walk);
	err = skcipher_walk_done(&walk, nbytes);
	}

	return err;
	}

	static int des3_ede_x86_setkey(struct crypto_tfm tfm, const u8 key,
	unsigned int keylen)
	{
	struct des3_ede_x86_ctx *ctx = crypto_tfm_ctx(tfm);
	u32 i, j, tmp;
	int err;

	err = des3_ede_expand_key(&ctx->enc, key, keylen);
	if (err == -ENOKEY) {
	if (crypto_tfm_get_flags(tfm) & CRYPTO_TFM_REQ_FORBID_WEAK_KEYS)
	err = -EINVAL;
	else
	err = 0;
	}

	if (err) {
	memset(ctx, 0, sizeof(*ctx));
	return err;
	}

	/* Fix encryption context for this implementation and form decryption
	* context. */
	j = DES3_EDE_EXPKEY_WORDS - 2;
	for (i = 0; i < DES3_EDE_EXPKEY_WORDS; i += 2, j -= 2) {
	tmp = ror32(ctx->enc.expkey[i + 1], 4);
	ctx->enc.expkey[i + 1] = tmp;

	ctx->dec.expkey[j + 0] = ctx->enc.expkey[i + 0];
	ctx->dec.expkey[j + 1] = tmp;
	}

	return 0;
	}

	static int des3_ede_x86_setkey_skcipher(struct crypto_skcipher *tfm,
	const u8 *key,
	unsigned int keylen)
	{
	return des3_ede_x86_setkey(&tfm->base, key, keylen);
	}

	static struct crypto_alg des3_ede_cipher = {
	.cra_name = "des3_ede",
	.cra_driver_name = "des3_ede-asm",
	.cra_priority = 200,
	.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
	.cra_blocksize = DES3_EDE_BLOCK_SIZE,
	.cra_ctxsize = sizeof(struct des3_ede_x86_ctx),
	.cra_alignmask = 0,
	.cra_module = THIS_MODULE,
	.cra_u = {
	.cipher = {
	.cia_min_keysize = DES3_EDE_KEY_SIZE,
	.cia_max_keysize = DES3_EDE_KEY_SIZE,
	.cia_setkey = des3_ede_x86_setkey,
	.cia_encrypt = des3_ede_x86_encrypt,
	.cia_decrypt = des3_ede_x86_decrypt,
	}
	}
	};

	static struct skcipher_alg des3_ede_skciphers[] = {
	{
	.base.cra_name = "ecb(des3_ede)",
	.base.cra_driver_name = "ecb-des3_ede-asm",
	.base.cra_priority = 300,
	.base.cra_blocksize = DES3_EDE_BLOCK_SIZE,
	.base.cra_ctxsize = sizeof(struct des3_ede_x86_ctx),
	.base.cra_module = THIS_MODULE,
	.min_keysize = DES3_EDE_KEY_SIZE,
	.max_keysize = DES3_EDE_KEY_SIZE,
	.setkey = des3_ede_x86_setkey_skcipher,
	.encrypt = ecb_encrypt,
	.decrypt = ecb_decrypt,
	}, {
	.base.cra_name = "cbc(des3_ede)",
	.base.cra_driver_name = "cbc-des3_ede-asm",
	.base.cra_priority = 300,
	.base.cra_blocksize = DES3_EDE_BLOCK_SIZE,
	.base.cra_ctxsize = sizeof(struct des3_ede_x86_ctx),
	.base.cra_module = THIS_MODULE,
	.min_keysize = DES3_EDE_KEY_SIZE,
	.max_keysize = DES3_EDE_KEY_SIZE,
	.ivsize = DES3_EDE_BLOCK_SIZE,
	.setkey = des3_ede_x86_setkey_skcipher,
	.encrypt = cbc_encrypt,
	.decrypt = cbc_decrypt,
	}
	};

	static bool is_blacklisted_cpu(void)
	{
	if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL)
	return false;

	if (boot_cpu_data.x86 == 0x0f) {
	/*
	* On Pentium 4, des3_ede-x86_64 is slower than generic C
	* implementation because use of 64bit rotates (which are really
	* slow on P4). Therefore blacklist P4s.
	*/
	return true;
	}

	return false;
	}

	static int force;
	module_param(force, int, 0);
	MODULE_PARM_DESC(force, "Force module load, ignore CPU blacklist");

	static int __init des3_ede_x86_init(void)
	{
	int err;

	if (!force && is_blacklisted_cpu()) {
	pr_info("des3_ede-x86_64: performance on this CPU would be suboptimal: disabling des3_ede-x86_64.\n");
	return -ENODEV;
	}

	err = crypto_register_alg(&des3_ede_cipher);
	if (err)
	return err;

	err = crypto_register_skciphers(des3_ede_skciphers,
	ARRAY_SIZE(des3_ede_skciphers));
	if (err)
	crypto_unregister_alg(&des3_ede_cipher);

	return err;
	}

	static void __exit des3_ede_x86_fini(void)
	{
	crypto_unregister_alg(&des3_ede_cipher);
	crypto_unregister_skciphers(des3_ede_skciphers,
	ARRAY_SIZE(des3_ede_skciphers));
	}

	module_init(des3_ede_x86_init);
	module_exit(des3_ede_x86_fini);

	MODULE_LICENSE("GPL");
	MODULE_DESCRIPTION("Triple DES EDE Cipher Algorithm, asm optimized");
	MODULE_ALIAS_CRYPTO("des3_ede");
	MODULE_ALIAS_CRYPTO("des3_ede-asm");
	MODULE_AUTHOR("Jussi Kivilinna <jussi.kivilinna@iki.fi>");