arch/x86/crypto/cast6_avx_glue.c - kernel/quantenna - Git at Google

 /*
  * Glue Code for the AVX assembler implemention of the Cast6 Cipher
  *
  * Copyright (C) 2012 Johannes Goetzfried
  *     <Johannes.Goetzfried@informatik.stud.uni-erlangen.de>
  *
  * Copyright © 2013 Jussi Kivilinna <jussi.kivilinna@iki.fi>
  *
  * 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.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
  * USA
  *
  */

 #include <linux/module.h>
 #include <linux/hardirq.h>
 #include <linux/types.h>
 #include <linux/crypto.h>
 #include <linux/err.h>
 #include <crypto/ablk_helper.h>
 #include <crypto/algapi.h>
 #include <crypto/cast6.h>
 #include <crypto/cryptd.h>
 #include <crypto/b128ops.h>
 #include <crypto/ctr.h>
 #include <crypto/lrw.h>
 #include <crypto/xts.h>
 #include <asm/fpu/api.h>
 #include <asm/crypto/glue_helper.h>

 #define CAST6_PARALLEL_BLOCKS 8

 asmlinkage void cast6_ecb_enc_8way(struct cast6_ctx *ctx, u8 *dst,
 				   const u8 *src);
 asmlinkage void cast6_ecb_dec_8way(struct cast6_ctx *ctx, u8 *dst,
 				   const u8 *src);

 asmlinkage void cast6_cbc_dec_8way(struct cast6_ctx *ctx, u8 *dst,
 				   const u8 *src);
 asmlinkage void cast6_ctr_8way(struct cast6_ctx *ctx, u8 *dst, const u8 *src,
 			       le128 *iv);

 asmlinkage void cast6_xts_enc_8way(struct cast6_ctx *ctx, u8 *dst,
 				   const u8 *src, le128 *iv);
 asmlinkage void cast6_xts_dec_8way(struct cast6_ctx *ctx, u8 *dst,
 				   const u8 *src, le128 *iv);

 static void cast6_xts_enc(void *ctx, u128 *dst, const u128 *src, le128 *iv)
 {
 	glue_xts_crypt_128bit_one(ctx, dst, src, iv,
 				  GLUE_FUNC_CAST(__cast6_encrypt));
 }

 static void cast6_xts_dec(void *ctx, u128 *dst, const u128 *src, le128 *iv)
 {
 	glue_xts_crypt_128bit_one(ctx, dst, src, iv,
 				  GLUE_FUNC_CAST(__cast6_decrypt));
 }

 static void cast6_crypt_ctr(void *ctx, u128 *dst, const u128 *src, le128 *iv)
 {
 	be128 ctrblk;

 	le128_to_be128(&ctrblk, iv);
 	le128_inc(iv);

 	__cast6_encrypt(ctx, (u8 *)&ctrblk, (u8 *)&ctrblk);
 	u128_xor(dst, src, (u128 *)&ctrblk);
 }

 static const struct common_glue_ctx cast6_enc = {
 	.num_funcs = 2,
 	.fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,

 	.funcs = { {
 		.num_blocks = CAST6_PARALLEL_BLOCKS,
 		.fn_u = { .ecb = GLUE_FUNC_CAST(cast6_ecb_enc_8way) }
 	}, {
 		.num_blocks = 1,
 		.fn_u = { .ecb = GLUE_FUNC_CAST(__cast6_encrypt) }
 	} }
 };

 static const struct common_glue_ctx cast6_ctr = {
 	.num_funcs = 2,
 	.fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,

 	.funcs = { {
 		.num_blocks = CAST6_PARALLEL_BLOCKS,
 		.fn_u = { .ctr = GLUE_CTR_FUNC_CAST(cast6_ctr_8way) }
 	}, {
 		.num_blocks = 1,
 		.fn_u = { .ctr = GLUE_CTR_FUNC_CAST(cast6_crypt_ctr) }
 	} }
 };

 static const struct common_glue_ctx cast6_enc_xts = {
 	.num_funcs = 2,
 	.fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,

 	.funcs = { {
 		.num_blocks = CAST6_PARALLEL_BLOCKS,
 		.fn_u = { .xts = GLUE_XTS_FUNC_CAST(cast6_xts_enc_8way) }
 	}, {
 		.num_blocks = 1,
 		.fn_u = { .xts = GLUE_XTS_FUNC_CAST(cast6_xts_enc) }
 	} }
 };

 static const struct common_glue_ctx cast6_dec = {
 	.num_funcs = 2,
 	.fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,

 	.funcs = { {
 		.num_blocks = CAST6_PARALLEL_BLOCKS,
 		.fn_u = { .ecb = GLUE_FUNC_CAST(cast6_ecb_dec_8way) }
 	}, {
 		.num_blocks = 1,
 		.fn_u = { .ecb = GLUE_FUNC_CAST(__cast6_decrypt) }
 	} }
 };

 static const struct common_glue_ctx cast6_dec_cbc = {
 	.num_funcs = 2,
 	.fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,

 	.funcs = { {
 		.num_blocks = CAST6_PARALLEL_BLOCKS,
 		.fn_u = { .cbc = GLUE_CBC_FUNC_CAST(cast6_cbc_dec_8way) }
 	}, {
 		.num_blocks = 1,
 		.fn_u = { .cbc = GLUE_CBC_FUNC_CAST(__cast6_decrypt) }
 	} }
 };

 static const struct common_glue_ctx cast6_dec_xts = {
 	.num_funcs = 2,
 	.fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,

 	.funcs = { {
 		.num_blocks = CAST6_PARALLEL_BLOCKS,
 		.fn_u = { .xts = GLUE_XTS_FUNC_CAST(cast6_xts_dec_8way) }
 	}, {
 		.num_blocks = 1,
 		.fn_u = { .xts = GLUE_XTS_FUNC_CAST(cast6_xts_dec) }
 	} }
 };

 static int ecb_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 		       struct scatterlist *src, unsigned int nbytes)
 {
 	return glue_ecb_crypt_128bit(&cast6_enc, desc, dst, src, nbytes);
 }

 static int ecb_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 		       struct scatterlist *src, unsigned int nbytes)
 {
 	return glue_ecb_crypt_128bit(&cast6_dec, desc, dst, src, nbytes);
 }

 static int cbc_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 		       struct scatterlist *src, unsigned int nbytes)
 {
 	return glue_cbc_encrypt_128bit(GLUE_FUNC_CAST(__cast6_encrypt), desc,
 				       dst, src, nbytes);
 }

 static int cbc_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 		       struct scatterlist *src, unsigned int nbytes)
 {
 	return glue_cbc_decrypt_128bit(&cast6_dec_cbc, desc, dst, src,
 				       nbytes);
 }

 static int ctr_crypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 		     struct scatterlist *src, unsigned int nbytes)
 {
 	return glue_ctr_crypt_128bit(&cast6_ctr, desc, dst, src, nbytes);
 }

 static inline bool cast6_fpu_begin(bool fpu_enabled, unsigned int nbytes)
 {
 	return glue_fpu_begin(CAST6_BLOCK_SIZE, CAST6_PARALLEL_BLOCKS,
 			      NULL, fpu_enabled, nbytes);
 }

 static inline void cast6_fpu_end(bool fpu_enabled)
 {
 	glue_fpu_end(fpu_enabled);
 }

 struct crypt_priv {
 	struct cast6_ctx *ctx;
 	bool fpu_enabled;
 };

 static void encrypt_callback(void *priv, u8 *srcdst, unsigned int nbytes)
 {
 	const unsigned int bsize = CAST6_BLOCK_SIZE;
 	struct crypt_priv *ctx = priv;
 	int i;

 	ctx->fpu_enabled = cast6_fpu_begin(ctx->fpu_enabled, nbytes);

 	if (nbytes == bsize * CAST6_PARALLEL_BLOCKS) {
 		cast6_ecb_enc_8way(ctx->ctx, srcdst, srcdst);
 		return;
 	}

 	for (i = 0; i < nbytes / bsize; i++, srcdst += bsize)
 		__cast6_encrypt(ctx->ctx, srcdst, srcdst);
 }

 static void decrypt_callback(void *priv, u8 *srcdst, unsigned int nbytes)
 {
 	const unsigned int bsize = CAST6_BLOCK_SIZE;
 	struct crypt_priv *ctx = priv;
 	int i;

 	ctx->fpu_enabled = cast6_fpu_begin(ctx->fpu_enabled, nbytes);

 	if (nbytes == bsize * CAST6_PARALLEL_BLOCKS) {
 		cast6_ecb_dec_8way(ctx->ctx, srcdst, srcdst);
 		return;
 	}

 	for (i = 0; i < nbytes / bsize; i++, srcdst += bsize)
 		__cast6_decrypt(ctx->ctx, srcdst, srcdst);
 }

 struct cast6_lrw_ctx {
 	struct lrw_table_ctx lrw_table;
 	struct cast6_ctx cast6_ctx;
 };

 static int lrw_cast6_setkey(struct crypto_tfm *tfm, const u8 *key,
 			      unsigned int keylen)
 {
 	struct cast6_lrw_ctx *ctx = crypto_tfm_ctx(tfm);
 	int err;

 	err = __cast6_setkey(&ctx->cast6_ctx, key, keylen - CAST6_BLOCK_SIZE,
 			     &tfm->crt_flags);
 	if (err)
 		return err;

 	return lrw_init_table(&ctx->lrw_table, key + keylen - CAST6_BLOCK_SIZE);
 }

 static int lrw_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 		       struct scatterlist *src, unsigned int nbytes)
 {
 	struct cast6_lrw_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
 	be128 buf[CAST6_PARALLEL_BLOCKS];
 	struct crypt_priv crypt_ctx = {
 		.ctx = &ctx->cast6_ctx,
 		.fpu_enabled = false,
 	};
 	struct lrw_crypt_req req = {
 		.tbuf = buf,
 		.tbuflen = sizeof(buf),

 		.table_ctx = &ctx->lrw_table,
 		.crypt_ctx = &crypt_ctx,
 		.crypt_fn = encrypt_callback,
 	};
 	int ret;

 	desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
 	ret = lrw_crypt(desc, dst, src, nbytes, &req);
 	cast6_fpu_end(crypt_ctx.fpu_enabled);

 	return ret;
 }

 static int lrw_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 		       struct scatterlist *src, unsigned int nbytes)
 {
 	struct cast6_lrw_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
 	be128 buf[CAST6_PARALLEL_BLOCKS];
 	struct crypt_priv crypt_ctx = {
 		.ctx = &ctx->cast6_ctx,
 		.fpu_enabled = false,
 	};
 	struct lrw_crypt_req req = {
 		.tbuf = buf,
 		.tbuflen = sizeof(buf),

 		.table_ctx = &ctx->lrw_table,
 		.crypt_ctx = &crypt_ctx,
 		.crypt_fn = decrypt_callback,
 	};
 	int ret;

 	desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
 	ret = lrw_crypt(desc, dst, src, nbytes, &req);
 	cast6_fpu_end(crypt_ctx.fpu_enabled);

 	return ret;
 }

 static void lrw_exit_tfm(struct crypto_tfm *tfm)
 {
 	struct cast6_lrw_ctx *ctx = crypto_tfm_ctx(tfm);

 	lrw_free_table(&ctx->lrw_table);
 }

 struct cast6_xts_ctx {
 	struct cast6_ctx tweak_ctx;
 	struct cast6_ctx crypt_ctx;
 };

 static int xts_cast6_setkey(struct crypto_tfm *tfm, const u8 *key,
 			      unsigned int keylen)
 {
 	struct cast6_xts_ctx *ctx = crypto_tfm_ctx(tfm);
 	u32 *flags = &tfm->crt_flags;
 	int err;

 	err = xts_check_key(tfm, key, keylen);
 	if (err)
 		return err;

 	/* first half of xts-key is for crypt */
 	err = __cast6_setkey(&ctx->crypt_ctx, key, keylen / 2, flags);
 	if (err)
 		return err;

 	/* second half of xts-key is for tweak */
 	return __cast6_setkey(&ctx->tweak_ctx, key + keylen / 2, keylen / 2,
 			      flags);
 }

 static int xts_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 		       struct scatterlist *src, unsigned int nbytes)
 {
 	struct cast6_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);

 	return glue_xts_crypt_128bit(&cast6_enc_xts, desc, dst, src, nbytes,
 				     XTS_TWEAK_CAST(__cast6_encrypt),
 				     &ctx->tweak_ctx, &ctx->crypt_ctx);
 }

 static int xts_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 		       struct scatterlist *src, unsigned int nbytes)
 {
 	struct cast6_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);

 	return glue_xts_crypt_128bit(&cast6_dec_xts, desc, dst, src, nbytes,
 				     XTS_TWEAK_CAST(__cast6_encrypt),
 				     &ctx->tweak_ctx, &ctx->crypt_ctx);
 }

 static struct crypto_alg cast6_algs[10] = { {
 	.cra_name		= "__ecb-cast6-avx",
 	.cra_driver_name	= "__driver-ecb-cast6-avx",
 	.cra_priority		= 0,
 	.cra_flags		= CRYPTO_ALG_TYPE_BLKCIPHER |
 				  CRYPTO_ALG_INTERNAL,
 	.cra_blocksize		= CAST6_BLOCK_SIZE,
 	.cra_ctxsize		= sizeof(struct cast6_ctx),
 	.cra_alignmask		= 0,
 	.cra_type		= &crypto_blkcipher_type,
 	.cra_module		= THIS_MODULE,
 	.cra_u = {
 		.blkcipher = {
 			.min_keysize	= CAST6_MIN_KEY_SIZE,
 			.max_keysize	= CAST6_MAX_KEY_SIZE,
 			.setkey		= cast6_setkey,
 			.encrypt	= ecb_encrypt,
 			.decrypt	= ecb_decrypt,
 		},
 	},
 }, {
 	.cra_name		= "__cbc-cast6-avx",
 	.cra_driver_name	= "__driver-cbc-cast6-avx",
 	.cra_priority		= 0,
 	.cra_flags		= CRYPTO_ALG_TYPE_BLKCIPHER |
 				  CRYPTO_ALG_INTERNAL,
 	.cra_blocksize		= CAST6_BLOCK_SIZE,
 	.cra_ctxsize		= sizeof(struct cast6_ctx),
 	.cra_alignmask		= 0,
 	.cra_type		= &crypto_blkcipher_type,
 	.cra_module		= THIS_MODULE,
 	.cra_u = {
 		.blkcipher = {
 			.min_keysize	= CAST6_MIN_KEY_SIZE,
 			.max_keysize	= CAST6_MAX_KEY_SIZE,
 			.setkey		= cast6_setkey,
 			.encrypt	= cbc_encrypt,
 			.decrypt	= cbc_decrypt,
 		},
 	},
 }, {
 	.cra_name		= "__ctr-cast6-avx",
 	.cra_driver_name	= "__driver-ctr-cast6-avx",
 	.cra_priority		= 0,
 	.cra_flags		= CRYPTO_ALG_TYPE_BLKCIPHER |
 				  CRYPTO_ALG_INTERNAL,
 	.cra_blocksize		= 1,
 	.cra_ctxsize		= sizeof(struct cast6_ctx),
 	.cra_alignmask		= 0,
 	.cra_type		= &crypto_blkcipher_type,
 	.cra_module		= THIS_MODULE,
 	.cra_u = {
 		.blkcipher = {
 			.min_keysize	= CAST6_MIN_KEY_SIZE,
 			.max_keysize	= CAST6_MAX_KEY_SIZE,
 			.ivsize		= CAST6_BLOCK_SIZE,
 			.setkey		= cast6_setkey,
 			.encrypt	= ctr_crypt,
 			.decrypt	= ctr_crypt,
 		},
 	},
 }, {
 	.cra_name		= "__lrw-cast6-avx",
 	.cra_driver_name	= "__driver-lrw-cast6-avx",
 	.cra_priority		= 0,
 	.cra_flags		= CRYPTO_ALG_TYPE_BLKCIPHER |
 				  CRYPTO_ALG_INTERNAL,
 	.cra_blocksize		= CAST6_BLOCK_SIZE,
 	.cra_ctxsize		= sizeof(struct cast6_lrw_ctx),
 	.cra_alignmask		= 0,
 	.cra_type		= &crypto_blkcipher_type,
 	.cra_module		= THIS_MODULE,
 	.cra_exit		= lrw_exit_tfm,
 	.cra_u = {
 		.blkcipher = {
 			.min_keysize	= CAST6_MIN_KEY_SIZE +
 					  CAST6_BLOCK_SIZE,
 			.max_keysize	= CAST6_MAX_KEY_SIZE +
 					  CAST6_BLOCK_SIZE,
 			.ivsize		= CAST6_BLOCK_SIZE,
 			.setkey		= lrw_cast6_setkey,
 			.encrypt	= lrw_encrypt,
 			.decrypt	= lrw_decrypt,
 		},
 	},
 }, {
 	.cra_name		= "__xts-cast6-avx",
 	.cra_driver_name	= "__driver-xts-cast6-avx",
 	.cra_priority		= 0,
 	.cra_flags		= CRYPTO_ALG_TYPE_BLKCIPHER |
 				  CRYPTO_ALG_INTERNAL,
 	.cra_blocksize		= CAST6_BLOCK_SIZE,
 	.cra_ctxsize		= sizeof(struct cast6_xts_ctx),
 	.cra_alignmask		= 0,
 	.cra_type		= &crypto_blkcipher_type,
 	.cra_module		= THIS_MODULE,
 	.cra_u = {
 		.blkcipher = {
 			.min_keysize	= CAST6_MIN_KEY_SIZE * 2,
 			.max_keysize	= CAST6_MAX_KEY_SIZE * 2,
 			.ivsize		= CAST6_BLOCK_SIZE,
 			.setkey		= xts_cast6_setkey,
 			.encrypt	= xts_encrypt,
 			.decrypt	= xts_decrypt,
 		},
 	},
 }, {
 	.cra_name		= "ecb(cast6)",
 	.cra_driver_name	= "ecb-cast6-avx",
 	.cra_priority		= 200,
 	.cra_flags		= CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
 	.cra_blocksize		= CAST6_BLOCK_SIZE,
 	.cra_ctxsize		= sizeof(struct async_helper_ctx),
 	.cra_alignmask		= 0,
 	.cra_type		= &crypto_ablkcipher_type,
 	.cra_module		= THIS_MODULE,
 	.cra_init		= ablk_init,
 	.cra_exit		= ablk_exit,
 	.cra_u = {
 		.ablkcipher = {
 			.min_keysize	= CAST6_MIN_KEY_SIZE,
 			.max_keysize	= CAST6_MAX_KEY_SIZE,
 			.setkey		= ablk_set_key,
 			.encrypt	= ablk_encrypt,
 			.decrypt	= ablk_decrypt,
 		},
 	},
 }, {
 	.cra_name		= "cbc(cast6)",
 	.cra_driver_name	= "cbc-cast6-avx",
 	.cra_priority		= 200,
 	.cra_flags		= CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
 	.cra_blocksize		= CAST6_BLOCK_SIZE,
 	.cra_ctxsize		= sizeof(struct async_helper_ctx),
 	.cra_alignmask		= 0,
 	.cra_type		= &crypto_ablkcipher_type,
 	.cra_module		= THIS_MODULE,
 	.cra_init		= ablk_init,
 	.cra_exit		= ablk_exit,
 	.cra_u = {
 		.ablkcipher = {
 			.min_keysize	= CAST6_MIN_KEY_SIZE,
 			.max_keysize	= CAST6_MAX_KEY_SIZE,
 			.ivsize		= CAST6_BLOCK_SIZE,
 			.setkey		= ablk_set_key,
 			.encrypt	= __ablk_encrypt,
 			.decrypt	= ablk_decrypt,
 		},
 	},
 }, {
 	.cra_name		= "ctr(cast6)",
 	.cra_driver_name	= "ctr-cast6-avx",
 	.cra_priority		= 200,
 	.cra_flags		= CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
 	.cra_blocksize		= 1,
 	.cra_ctxsize		= sizeof(struct async_helper_ctx),
 	.cra_alignmask		= 0,
 	.cra_type		= &crypto_ablkcipher_type,
 	.cra_module		= THIS_MODULE,
 	.cra_init		= ablk_init,
 	.cra_exit		= ablk_exit,
 	.cra_u = {
 		.ablkcipher = {
 			.min_keysize	= CAST6_MIN_KEY_SIZE,
 			.max_keysize	= CAST6_MAX_KEY_SIZE,
 			.ivsize		= CAST6_BLOCK_SIZE,
 			.setkey		= ablk_set_key,
 			.encrypt	= ablk_encrypt,
 			.decrypt	= ablk_encrypt,
 			.geniv		= "chainiv",
 		},
 	},
 }, {
 	.cra_name		= "lrw(cast6)",
 	.cra_driver_name	= "lrw-cast6-avx",
 	.cra_priority		= 200,
 	.cra_flags		= CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
 	.cra_blocksize		= CAST6_BLOCK_SIZE,
 	.cra_ctxsize		= sizeof(struct async_helper_ctx),
 	.cra_alignmask		= 0,
 	.cra_type		= &crypto_ablkcipher_type,
 	.cra_module		= THIS_MODULE,
 	.cra_init		= ablk_init,
 	.cra_exit		= ablk_exit,
 	.cra_u = {
 		.ablkcipher = {
 			.min_keysize	= CAST6_MIN_KEY_SIZE +
 					  CAST6_BLOCK_SIZE,
 			.max_keysize	= CAST6_MAX_KEY_SIZE +
 					  CAST6_BLOCK_SIZE,
 			.ivsize		= CAST6_BLOCK_SIZE,
 			.setkey		= ablk_set_key,
 			.encrypt	= ablk_encrypt,
 			.decrypt	= ablk_decrypt,
 		},
 	},
 }, {
 	.cra_name		= "xts(cast6)",
 	.cra_driver_name	= "xts-cast6-avx",
 	.cra_priority		= 200,
 	.cra_flags		= CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
 	.cra_blocksize		= CAST6_BLOCK_SIZE,
 	.cra_ctxsize		= sizeof(struct async_helper_ctx),
 	.cra_alignmask		= 0,
 	.cra_type		= &crypto_ablkcipher_type,
 	.cra_module		= THIS_MODULE,
 	.cra_init		= ablk_init,
 	.cra_exit		= ablk_exit,
 	.cra_u = {
 		.ablkcipher = {
 			.min_keysize	= CAST6_MIN_KEY_SIZE * 2,
 			.max_keysize	= CAST6_MAX_KEY_SIZE * 2,
 			.ivsize		= CAST6_BLOCK_SIZE,
 			.setkey		= ablk_set_key,
 			.encrypt	= ablk_encrypt,
 			.decrypt	= ablk_decrypt,
 		},
 	},
 } };

 static int __init cast6_init(void)
 {
 	const char *feature_name;

 	if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM,
 				&feature_name)) {
 		pr_info("CPU feature '%s' is not supported.\n", feature_name);
 		return -ENODEV;
 	}

 	return crypto_register_algs(cast6_algs, ARRAY_SIZE(cast6_algs));
 }

 static void __exit cast6_exit(void)
 {
 	crypto_unregister_algs(cast6_algs, ARRAY_SIZE(cast6_algs));
 }

 module_init(cast6_init);
 module_exit(cast6_exit);

 MODULE_DESCRIPTION("Cast6 Cipher Algorithm, AVX optimized");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS_CRYPTO("cast6");
	/*
	* Glue Code for the AVX assembler implemention of the Cast6 Cipher
	*
	* Copyright (C) 2012 Johannes Goetzfried
	* <Johannes.Goetzfried@informatik.stud.uni-erlangen.de>
	*
	* Copyright © 2013 Jussi Kivilinna <jussi.kivilinna@iki.fi>
	*
	* 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.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
	* USA
	*
	*/

	#include <linux/module.h>
	#include <linux/hardirq.h>
	#include <linux/types.h>
	#include <linux/crypto.h>
	#include <linux/err.h>
	#include <crypto/ablk_helper.h>
	#include <crypto/algapi.h>
	#include <crypto/cast6.h>
	#include <crypto/cryptd.h>
	#include <crypto/b128ops.h>
	#include <crypto/ctr.h>
	#include <crypto/lrw.h>
	#include <crypto/xts.h>
	#include <asm/fpu/api.h>
	#include <asm/crypto/glue_helper.h>

	#define CAST6_PARALLEL_BLOCKS 8

	asmlinkage void cast6_ecb_enc_8way(struct cast6_ctx ctx, u8 dst,
	const u8 *src);
	asmlinkage void cast6_ecb_dec_8way(struct cast6_ctx ctx, u8 dst,
	const u8 *src);

	asmlinkage void cast6_cbc_dec_8way(struct cast6_ctx ctx, u8 dst,
	const u8 *src);
	asmlinkage void cast6_ctr_8way(struct cast6_ctx ctx, u8 dst, const u8 *src,
	le128 *iv);

	asmlinkage void cast6_xts_enc_8way(struct cast6_ctx ctx, u8 dst,
	const u8 src, le128 iv);
	asmlinkage void cast6_xts_dec_8way(struct cast6_ctx ctx, u8 dst,
	const u8 src, le128 iv);

	static void cast6_xts_enc(void ctx, u128 dst, const u128 src, le128 iv)
	{
	glue_xts_crypt_128bit_one(ctx, dst, src, iv,
	GLUE_FUNC_CAST(__cast6_encrypt));
	}

	static void cast6_xts_dec(void ctx, u128 dst, const u128 src, le128 iv)
	{
	glue_xts_crypt_128bit_one(ctx, dst, src, iv,
	GLUE_FUNC_CAST(__cast6_decrypt));
	}

	static void cast6_crypt_ctr(void ctx, u128 dst, const u128 src, le128 iv)
	{
	be128 ctrblk;

	le128_to_be128(&ctrblk, iv);
	le128_inc(iv);

	__cast6_encrypt(ctx, (u8 )&ctrblk, (u8 )&ctrblk);
	u128_xor(dst, src, (u128 *)&ctrblk);
	}

	static const struct common_glue_ctx cast6_enc = {
	.num_funcs = 2,
	.fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,

	.funcs = { {
	.num_blocks = CAST6_PARALLEL_BLOCKS,
	.fn_u = { .ecb = GLUE_FUNC_CAST(cast6_ecb_enc_8way) }
	}, {
	.num_blocks = 1,
	.fn_u = { .ecb = GLUE_FUNC_CAST(__cast6_encrypt) }
	} }
	};

	static const struct common_glue_ctx cast6_ctr = {
	.num_funcs = 2,
	.fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,

	.funcs = { {
	.num_blocks = CAST6_PARALLEL_BLOCKS,
	.fn_u = { .ctr = GLUE_CTR_FUNC_CAST(cast6_ctr_8way) }
	}, {
	.num_blocks = 1,
	.fn_u = { .ctr = GLUE_CTR_FUNC_CAST(cast6_crypt_ctr) }
	} }
	};

	static const struct common_glue_ctx cast6_enc_xts = {
	.num_funcs = 2,
	.fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,

	.funcs = { {
	.num_blocks = CAST6_PARALLEL_BLOCKS,
	.fn_u = { .xts = GLUE_XTS_FUNC_CAST(cast6_xts_enc_8way) }
	}, {
	.num_blocks = 1,
	.fn_u = { .xts = GLUE_XTS_FUNC_CAST(cast6_xts_enc) }
	} }
	};

	static const struct common_glue_ctx cast6_dec = {
	.num_funcs = 2,
	.fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,

	.funcs = { {
	.num_blocks = CAST6_PARALLEL_BLOCKS,
	.fn_u = { .ecb = GLUE_FUNC_CAST(cast6_ecb_dec_8way) }
	}, {
	.num_blocks = 1,
	.fn_u = { .ecb = GLUE_FUNC_CAST(__cast6_decrypt) }
	} }
	};

	static const struct common_glue_ctx cast6_dec_cbc = {
	.num_funcs = 2,
	.fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,

	.funcs = { {
	.num_blocks = CAST6_PARALLEL_BLOCKS,
	.fn_u = { .cbc = GLUE_CBC_FUNC_CAST(cast6_cbc_dec_8way) }
	}, {
	.num_blocks = 1,
	.fn_u = { .cbc = GLUE_CBC_FUNC_CAST(__cast6_decrypt) }
	} }
	};

	static const struct common_glue_ctx cast6_dec_xts = {
	.num_funcs = 2,
	.fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,

	.funcs = { {
	.num_blocks = CAST6_PARALLEL_BLOCKS,
	.fn_u = { .xts = GLUE_XTS_FUNC_CAST(cast6_xts_dec_8way) }
	}, {
	.num_blocks = 1,
	.fn_u = { .xts = GLUE_XTS_FUNC_CAST(cast6_xts_dec) }
	} }
	};

	static int ecb_encrypt(struct blkcipher_desc desc, struct scatterlist dst,
	struct scatterlist *src, unsigned int nbytes)
	{
	return glue_ecb_crypt_128bit(&cast6_enc, desc, dst, src, nbytes);
	}

	static int ecb_decrypt(struct blkcipher_desc desc, struct scatterlist dst,
	struct scatterlist *src, unsigned int nbytes)
	{
	return glue_ecb_crypt_128bit(&cast6_dec, desc, dst, src, nbytes);
	}

	static int cbc_encrypt(struct blkcipher_desc desc, struct scatterlist dst,
	struct scatterlist *src, unsigned int nbytes)
	{
	return glue_cbc_encrypt_128bit(GLUE_FUNC_CAST(__cast6_encrypt), desc,
	dst, src, nbytes);
	}

	static int cbc_decrypt(struct blkcipher_desc desc, struct scatterlist dst,
	struct scatterlist *src, unsigned int nbytes)
	{
	return glue_cbc_decrypt_128bit(&cast6_dec_cbc, desc, dst, src,
	nbytes);
	}

	static int ctr_crypt(struct blkcipher_desc desc, struct scatterlist dst,
	struct scatterlist *src, unsigned int nbytes)
	{
	return glue_ctr_crypt_128bit(&cast6_ctr, desc, dst, src, nbytes);
	}

	static inline bool cast6_fpu_begin(bool fpu_enabled, unsigned int nbytes)
	{
	return glue_fpu_begin(CAST6_BLOCK_SIZE, CAST6_PARALLEL_BLOCKS,
	NULL, fpu_enabled, nbytes);
	}

	static inline void cast6_fpu_end(bool fpu_enabled)
	{
	glue_fpu_end(fpu_enabled);
	}

	struct crypt_priv {
	struct cast6_ctx *ctx;
	bool fpu_enabled;
	};

	static void encrypt_callback(void priv, u8 srcdst, unsigned int nbytes)
	{
	const unsigned int bsize = CAST6_BLOCK_SIZE;
	struct crypt_priv *ctx = priv;
	int i;

	ctx->fpu_enabled = cast6_fpu_begin(ctx->fpu_enabled, nbytes);

	if (nbytes == bsize * CAST6_PARALLEL_BLOCKS) {
	cast6_ecb_enc_8way(ctx->ctx, srcdst, srcdst);
	return;
	}

	for (i = 0; i < nbytes / bsize; i++, srcdst += bsize)
	__cast6_encrypt(ctx->ctx, srcdst, srcdst);
	}

	static void decrypt_callback(void priv, u8 srcdst, unsigned int nbytes)
	{
	const unsigned int bsize = CAST6_BLOCK_SIZE;
	struct crypt_priv *ctx = priv;
	int i;

	ctx->fpu_enabled = cast6_fpu_begin(ctx->fpu_enabled, nbytes);

	if (nbytes == bsize * CAST6_PARALLEL_BLOCKS) {
	cast6_ecb_dec_8way(ctx->ctx, srcdst, srcdst);
	return;
	}

	for (i = 0; i < nbytes / bsize; i++, srcdst += bsize)
	__cast6_decrypt(ctx->ctx, srcdst, srcdst);
	}

	struct cast6_lrw_ctx {
	struct lrw_table_ctx lrw_table;
	struct cast6_ctx cast6_ctx;
	};

	static int lrw_cast6_setkey(struct crypto_tfm tfm, const u8 key,
	unsigned int keylen)
	{
	struct cast6_lrw_ctx *ctx = crypto_tfm_ctx(tfm);
	int err;

	err = __cast6_setkey(&ctx->cast6_ctx, key, keylen - CAST6_BLOCK_SIZE,
	&tfm->crt_flags);
	if (err)
	return err;

	return lrw_init_table(&ctx->lrw_table, key + keylen - CAST6_BLOCK_SIZE);
	}

	static int lrw_encrypt(struct blkcipher_desc desc, struct scatterlist dst,
	struct scatterlist *src, unsigned int nbytes)
	{
	struct cast6_lrw_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
	be128 buf[CAST6_PARALLEL_BLOCKS];
	struct crypt_priv crypt_ctx = {
	.ctx = &ctx->cast6_ctx,
	.fpu_enabled = false,
	};
	struct lrw_crypt_req req = {
	.tbuf = buf,
	.tbuflen = sizeof(buf),

	.table_ctx = &ctx->lrw_table,
	.crypt_ctx = &crypt_ctx,
	.crypt_fn = encrypt_callback,
	};
	int ret;

	desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
	ret = lrw_crypt(desc, dst, src, nbytes, &req);
	cast6_fpu_end(crypt_ctx.fpu_enabled);

	return ret;
	}

	static int lrw_decrypt(struct blkcipher_desc desc, struct scatterlist dst,
	struct scatterlist *src, unsigned int nbytes)
	{
	struct cast6_lrw_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
	be128 buf[CAST6_PARALLEL_BLOCKS];
	struct crypt_priv crypt_ctx = {
	.ctx = &ctx->cast6_ctx,
	.fpu_enabled = false,
	};
	struct lrw_crypt_req req = {
	.tbuf = buf,
	.tbuflen = sizeof(buf),

	.table_ctx = &ctx->lrw_table,
	.crypt_ctx = &crypt_ctx,
	.crypt_fn = decrypt_callback,
	};
	int ret;

	desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
	ret = lrw_crypt(desc, dst, src, nbytes, &req);
	cast6_fpu_end(crypt_ctx.fpu_enabled);

	return ret;
	}

	static void lrw_exit_tfm(struct crypto_tfm *tfm)
	{
	struct cast6_lrw_ctx *ctx = crypto_tfm_ctx(tfm);

	lrw_free_table(&ctx->lrw_table);
	}

	struct cast6_xts_ctx {
	struct cast6_ctx tweak_ctx;
	struct cast6_ctx crypt_ctx;
	};

	static int xts_cast6_setkey(struct crypto_tfm tfm, const u8 key,
	unsigned int keylen)
	{
	struct cast6_xts_ctx *ctx = crypto_tfm_ctx(tfm);
	u32 *flags = &tfm->crt_flags;
	int err;

	err = xts_check_key(tfm, key, keylen);
	if (err)
	return err;

	/* first half of xts-key is for crypt */
	err = __cast6_setkey(&ctx->crypt_ctx, key, keylen / 2, flags);
	if (err)
	return err;

	/* second half of xts-key is for tweak */
	return __cast6_setkey(&ctx->tweak_ctx, key + keylen / 2, keylen / 2,
	flags);
	}

	static int xts_encrypt(struct blkcipher_desc desc, struct scatterlist dst,
	struct scatterlist *src, unsigned int nbytes)
	{
	struct cast6_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);

	return glue_xts_crypt_128bit(&cast6_enc_xts, desc, dst, src, nbytes,
	XTS_TWEAK_CAST(__cast6_encrypt),
	&ctx->tweak_ctx, &ctx->crypt_ctx);
	}

	static int xts_decrypt(struct blkcipher_desc desc, struct scatterlist dst,
	struct scatterlist *src, unsigned int nbytes)
	{
	struct cast6_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);

	return glue_xts_crypt_128bit(&cast6_dec_xts, desc, dst, src, nbytes,
	XTS_TWEAK_CAST(__cast6_encrypt),
	&ctx->tweak_ctx, &ctx->crypt_ctx);
	}

	static struct crypto_alg cast6_algs[10] = { {
	.cra_name = "__ecb-cast6-avx",
	.cra_driver_name = "__driver-ecb-cast6-avx",
	.cra_priority = 0,
	.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER \|
	CRYPTO_ALG_INTERNAL,
	.cra_blocksize = CAST6_BLOCK_SIZE,
	.cra_ctxsize = sizeof(struct cast6_ctx),
	.cra_alignmask = 0,
	.cra_type = &crypto_blkcipher_type,
	.cra_module = THIS_MODULE,
	.cra_u = {
	.blkcipher = {
	.min_keysize = CAST6_MIN_KEY_SIZE,
	.max_keysize = CAST6_MAX_KEY_SIZE,
	.setkey = cast6_setkey,
	.encrypt = ecb_encrypt,
	.decrypt = ecb_decrypt,
	},
	},
	}, {
	.cra_name = "__cbc-cast6-avx",
	.cra_driver_name = "__driver-cbc-cast6-avx",
	.cra_priority = 0,
	.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER \|
	CRYPTO_ALG_INTERNAL,
	.cra_blocksize = CAST6_BLOCK_SIZE,
	.cra_ctxsize = sizeof(struct cast6_ctx),
	.cra_alignmask = 0,
	.cra_type = &crypto_blkcipher_type,
	.cra_module = THIS_MODULE,
	.cra_u = {
	.blkcipher = {
	.min_keysize = CAST6_MIN_KEY_SIZE,
	.max_keysize = CAST6_MAX_KEY_SIZE,
	.setkey = cast6_setkey,
	.encrypt = cbc_encrypt,
	.decrypt = cbc_decrypt,
	},
	},
	}, {
	.cra_name = "__ctr-cast6-avx",
	.cra_driver_name = "__driver-ctr-cast6-avx",
	.cra_priority = 0,
	.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER \|
	CRYPTO_ALG_INTERNAL,
	.cra_blocksize = 1,
	.cra_ctxsize = sizeof(struct cast6_ctx),
	.cra_alignmask = 0,
	.cra_type = &crypto_blkcipher_type,
	.cra_module = THIS_MODULE,
	.cra_u = {
	.blkcipher = {
	.min_keysize = CAST6_MIN_KEY_SIZE,
	.max_keysize = CAST6_MAX_KEY_SIZE,
	.ivsize = CAST6_BLOCK_SIZE,
	.setkey = cast6_setkey,
	.encrypt = ctr_crypt,
	.decrypt = ctr_crypt,
	},
	},
	}, {
	.cra_name = "__lrw-cast6-avx",
	.cra_driver_name = "__driver-lrw-cast6-avx",
	.cra_priority = 0,
	.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER \|
	CRYPTO_ALG_INTERNAL,
	.cra_blocksize = CAST6_BLOCK_SIZE,
	.cra_ctxsize = sizeof(struct cast6_lrw_ctx),
	.cra_alignmask = 0,
	.cra_type = &crypto_blkcipher_type,
	.cra_module = THIS_MODULE,
	.cra_exit = lrw_exit_tfm,
	.cra_u = {
	.blkcipher = {
	.min_keysize = CAST6_MIN_KEY_SIZE +
	CAST6_BLOCK_SIZE,
	.max_keysize = CAST6_MAX_KEY_SIZE +
	CAST6_BLOCK_SIZE,
	.ivsize = CAST6_BLOCK_SIZE,
	.setkey = lrw_cast6_setkey,
	.encrypt = lrw_encrypt,
	.decrypt = lrw_decrypt,
	},
	},
	}, {
	.cra_name = "__xts-cast6-avx",
	.cra_driver_name = "__driver-xts-cast6-avx",
	.cra_priority = 0,
	.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER \|
	CRYPTO_ALG_INTERNAL,
	.cra_blocksize = CAST6_BLOCK_SIZE,
	.cra_ctxsize = sizeof(struct cast6_xts_ctx),
	.cra_alignmask = 0,
	.cra_type = &crypto_blkcipher_type,
	.cra_module = THIS_MODULE,
	.cra_u = {
	.blkcipher = {
	.min_keysize = CAST6_MIN_KEY_SIZE * 2,
	.max_keysize = CAST6_MAX_KEY_SIZE * 2,
	.ivsize = CAST6_BLOCK_SIZE,
	.setkey = xts_cast6_setkey,
	.encrypt = xts_encrypt,
	.decrypt = xts_decrypt,
	},
	},
	}, {
	.cra_name = "ecb(cast6)",
	.cra_driver_name = "ecb-cast6-avx",
	.cra_priority = 200,
	.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER \| CRYPTO_ALG_ASYNC,
	.cra_blocksize = CAST6_BLOCK_SIZE,
	.cra_ctxsize = sizeof(struct async_helper_ctx),
	.cra_alignmask = 0,
	.cra_type = &crypto_ablkcipher_type,
	.cra_module = THIS_MODULE,
	.cra_init = ablk_init,
	.cra_exit = ablk_exit,
	.cra_u = {
	.ablkcipher = {
	.min_keysize = CAST6_MIN_KEY_SIZE,
	.max_keysize = CAST6_MAX_KEY_SIZE,
	.setkey = ablk_set_key,
	.encrypt = ablk_encrypt,
	.decrypt = ablk_decrypt,
	},
	},
	}, {
	.cra_name = "cbc(cast6)",
	.cra_driver_name = "cbc-cast6-avx",
	.cra_priority = 200,
	.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER \| CRYPTO_ALG_ASYNC,
	.cra_blocksize = CAST6_BLOCK_SIZE,
	.cra_ctxsize = sizeof(struct async_helper_ctx),
	.cra_alignmask = 0,
	.cra_type = &crypto_ablkcipher_type,
	.cra_module = THIS_MODULE,
	.cra_init = ablk_init,
	.cra_exit = ablk_exit,
	.cra_u = {
	.ablkcipher = {
	.min_keysize = CAST6_MIN_KEY_SIZE,
	.max_keysize = CAST6_MAX_KEY_SIZE,
	.ivsize = CAST6_BLOCK_SIZE,
	.setkey = ablk_set_key,
	.encrypt = __ablk_encrypt,
	.decrypt = ablk_decrypt,
	},
	},
	}, {
	.cra_name = "ctr(cast6)",
	.cra_driver_name = "ctr-cast6-avx",
	.cra_priority = 200,
	.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER \| CRYPTO_ALG_ASYNC,
	.cra_blocksize = 1,
	.cra_ctxsize = sizeof(struct async_helper_ctx),
	.cra_alignmask = 0,
	.cra_type = &crypto_ablkcipher_type,
	.cra_module = THIS_MODULE,
	.cra_init = ablk_init,
	.cra_exit = ablk_exit,
	.cra_u = {
	.ablkcipher = {
	.min_keysize = CAST6_MIN_KEY_SIZE,
	.max_keysize = CAST6_MAX_KEY_SIZE,
	.ivsize = CAST6_BLOCK_SIZE,
	.setkey = ablk_set_key,
	.encrypt = ablk_encrypt,
	.decrypt = ablk_encrypt,
	.geniv = "chainiv",
	},
	},
	}, {
	.cra_name = "lrw(cast6)",
	.cra_driver_name = "lrw-cast6-avx",
	.cra_priority = 200,
	.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER \| CRYPTO_ALG_ASYNC,
	.cra_blocksize = CAST6_BLOCK_SIZE,
	.cra_ctxsize = sizeof(struct async_helper_ctx),
	.cra_alignmask = 0,
	.cra_type = &crypto_ablkcipher_type,
	.cra_module = THIS_MODULE,
	.cra_init = ablk_init,
	.cra_exit = ablk_exit,
	.cra_u = {
	.ablkcipher = {
	.min_keysize = CAST6_MIN_KEY_SIZE +
	CAST6_BLOCK_SIZE,
	.max_keysize = CAST6_MAX_KEY_SIZE +
	CAST6_BLOCK_SIZE,
	.ivsize = CAST6_BLOCK_SIZE,
	.setkey = ablk_set_key,
	.encrypt = ablk_encrypt,
	.decrypt = ablk_decrypt,
	},
	},
	}, {
	.cra_name = "xts(cast6)",
	.cra_driver_name = "xts-cast6-avx",
	.cra_priority = 200,
	.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER \| CRYPTO_ALG_ASYNC,
	.cra_blocksize = CAST6_BLOCK_SIZE,
	.cra_ctxsize = sizeof(struct async_helper_ctx),
	.cra_alignmask = 0,
	.cra_type = &crypto_ablkcipher_type,
	.cra_module = THIS_MODULE,
	.cra_init = ablk_init,
	.cra_exit = ablk_exit,
	.cra_u = {
	.ablkcipher = {
	.min_keysize = CAST6_MIN_KEY_SIZE * 2,
	.max_keysize = CAST6_MAX_KEY_SIZE * 2,
	.ivsize = CAST6_BLOCK_SIZE,
	.setkey = ablk_set_key,
	.encrypt = ablk_encrypt,
	.decrypt = ablk_decrypt,
	},
	},
	} };

	static int __init cast6_init(void)
	{
	const char *feature_name;

	if (!cpu_has_xfeatures(XFEATURE_MASK_SSE \| XFEATURE_MASK_YMM,
	&feature_name)) {
	pr_info("CPU feature '%s' is not supported.\n", feature_name);
	return -ENODEV;
	}

	return crypto_register_algs(cast6_algs, ARRAY_SIZE(cast6_algs));
	}

	static void __exit cast6_exit(void)
	{
	crypto_unregister_algs(cast6_algs, ARRAY_SIZE(cast6_algs));
	}

	module_init(cast6_init);
	module_exit(cast6_exit);

	MODULE_DESCRIPTION("Cast6 Cipher Algorithm, AVX optimized");
	MODULE_LICENSE("GPL");
	MODULE_ALIAS_CRYPTO("cast6");