text: /*
   * Glue Code for AVX assembler version of Twofish 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/twofish.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/twofish.h>
  #include <asm/crypto/glue_helper.h>
  #include <crypto/scatterwalk.h>
  #include <linux/workqueue.h>
  #include <linux/spinlock.h>
  
  #define TWOFISH_PARALLEL_BLOCKS 8
  
  /* 8-way parallel cipher functions */
  asmlinkage void twofish_ecb_enc_8way(struct twofish_ctx *ctx, u8 *dst,
  				     const u8 *src);
  asmlinkage void twofish_ecb_dec_8way(struct twofish_ctx *ctx, u8 *dst,
  				     const u8 *src);
  
  asmlinkage void twofish_cbc_dec_8way(struct twofish_ctx *ctx, u8 *dst,
  				     const u8 *src);
  asmlinkage void twofish_ctr_8way(struct twofish_ctx *ctx, u8 *dst,
  				 const u8 *src, le128 *iv);
  
  asmlinkage void twofish_xts_enc_8way(struct twofish_ctx *ctx, u8 *dst,
  				     const u8 *src, le128 *iv);
  asmlinkage void twofish_xts_dec_8way(struct twofish_ctx *ctx, u8 *dst,
  				     const u8 *src, le128 *iv);
  
  static inline void twofish_enc_blk_3way(struct twofish_ctx *ctx, u8 *dst,
  					const u8 *src)
  {
  	__twofish_enc_blk_3way(ctx, dst, src, false);
  }
  
  static void twofish_xts_enc(void *ctx, u128 *dst, const u128 *src, le128 *iv)
  {
  	glue_xts_crypt_128bit_one(ctx, dst, src, iv,
  				  GLUE_FUNC_CAST(twofish_enc_blk));
  }
  
  static void twofish_xts_dec(void *ctx, u128 *dst, const u128 *src, le128 *iv)
  {
  	glue_xts_crypt_128bit_one(ctx, dst, src, iv,
  				  GLUE_FUNC_CAST(twofish_dec_blk));
  }
  
  
  static const struct common_glue_ctx twofish_enc = {
  	.num_funcs = 3,
  	.fpu_blocks_limit = TWOFISH_PARALLEL_BLOCKS,
  
  	.funcs = { {
  		.num_blocks = TWOFISH_PARALLEL_BLOCKS,
  		.fn_u = { .ecb = GLUE_FUNC_CAST(twofish_ecb_enc_8way) }
  	}, {
  		.num_blocks = 3,
  		.fn_u = { .ecb = GLUE_FUNC_CAST(twofish_enc_blk_3way) }
  	}, {
  		.num_blocks = 1,
  		.fn_u = { .ecb = GLUE_FUNC_CAST(twofish_enc_blk) }
  	} }
  };
  
  static const struct common_glue_ctx twofish_ctr = {
  	.num_funcs = 3,
  	.fpu_blocks_limit = TWOFISH_PARALLEL_BLOCKS,
  
  	.funcs = { {
  		.num_blocks = TWOFISH_PARALLEL_BLOCKS,
  		.fn_u = { .ctr = GLUE_CTR_FUNC_CAST(twofish_ctr_8way) }
  	}, {
  		.num_blocks = 3,
  		.fn_u = { .ctr = GLUE_CTR_FUNC_CAST(twofish_enc_blk_ctr_3way) }
  	}, {
  		.num_blocks = 1,
  		.fn_u = { .ctr = GLUE_CTR_FUNC_CAST(twofish_enc_blk_ctr) }
  	} }
  };
  
  static const struct common_glue_ctx twofish_enc_xts = {
  	.num_funcs = 2,
  	.fpu_blocks_limit = TWOFISH_PARALLEL_BLOCKS,
  
  	.funcs = { {
  		.num_blocks = TWOFISH_PARALLEL_BLOCKS,
  		.fn_u = { .xts = GLUE_XTS_FUNC_CAST(twofish_xts_enc_8way) }
  	}, {
  		.num_blocks = 1,
  		.fn_u = { .xts = GLUE_XTS_FUNC_CAST(twofish_xts_enc) }
  	} }
  };
  
  static const struct common_glue_ctx twofish_dec = {
  	.num_funcs = 3,
  	.fpu_blocks_limit = TWOFISH_PARALLEL_BLOCKS,
  
  	.funcs = { {
  		.num_blocks = TWOFISH_PARALLEL_BLOCKS,
  		.fn_u = { .ecb = GLUE_FUNC_CAST(twofish_ecb_dec_8way) }
  	}, {
  		.num_blocks = 3,
  		.fn_u = { .ecb = GLUE_FUNC_CAST(twofish_dec_blk_3way) }
  	}, {
  		.num_blocks = 1,
  		.fn_u = { .ecb = GLUE_FUNC_CAST(twofish_dec_blk) }
  	} }
  };
  
  static const struct common_glue_ctx twofish_dec_cbc = {
  	.num_funcs = 3,
  	.fpu_blocks_limit = TWOFISH_PARALLEL_BLOCKS,
  
  	.funcs = { {
  		.num_blocks = TWOFISH_PARALLEL_BLOCKS,
  		.fn_u = { .cbc = GLUE_CBC_FUNC_CAST(twofish_cbc_dec_8way) }
  	}, {
  		.num_blocks = 3,
  		.fn_u = { .cbc = GLUE_CBC_FUNC_CAST(twofish_dec_blk_cbc_3way) }
  	}, {
  		.num_blocks = 1,
  		.fn_u = { .cbc = GLUE_CBC_FUNC_CAST(twofish_dec_blk) }
  	} }
  };
  
  static const struct common_glue_ctx twofish_dec_xts = {
  	.num_funcs = 2,
  	.fpu_blocks_limit = TWOFISH_PARALLEL_BLOCKS,
  
  	.funcs = { {
  		.num_blocks = TWOFISH_PARALLEL_BLOCKS,
  		.fn_u = { .xts = GLUE_XTS_FUNC_CAST(twofish_xts_dec_8way) }
  	}, {
  		.num_blocks = 1,
  		.fn_u = { .xts = GLUE_XTS_FUNC_CAST(twofish_xts_dec) }
  	} }
  };
  
  static int ecb_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
  		       struct scatterlist *src, unsigned int nbytes)
  {
  	return glue_ecb_crypt_128bit(&twofish_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(&twofish_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(twofish_enc_blk), 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(&twofish_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(&twofish_ctr, desc, dst, src, nbytes);
  }
  
  static inline bool twofish_fpu_begin(bool fpu_enabled, unsigned int nbytes)
  {
  	return glue_fpu_begin(TF_BLOCK_SIZE, TWOFISH_PARALLEL_BLOCKS, NULL,
  			      fpu_enabled, nbytes);
  }
  
  static inline void twofish_fpu_end(bool fpu_enabled)
  {
  	glue_fpu_end(fpu_enabled);
  }
  
  struct crypt_priv {
  	struct twofish_ctx *ctx;
  	bool fpu_enabled;
  };
  
  static void encrypt_callback(void *priv, u8 *srcdst, unsigned int nbytes)
  {
  	const unsigned int bsize = TF_BLOCK_SIZE;
  	struct crypt_priv *ctx = priv;
  	int i;
  
  	ctx->fpu_enabled = twofish_fpu_begin(ctx->fpu_enabled, nbytes);
  
  	if (nbytes == bsize * TWOFISH_PARALLEL_BLOCKS) {
  		twofish_ecb_enc_8way(ctx->ctx, srcdst, srcdst);
  		return;
  	}
  
  	for (i = 0; i < nbytes / (bsize * 3); i++, srcdst += bsize * 3)
  		twofish_enc_blk_3way(ctx->ctx, srcdst, srcdst);
  
  	nbytes %= bsize * 3;
  
  	for (i = 0; i < nbytes / bsize; i++, srcdst += bsize)
  		twofish_enc_blk(ctx->ctx, srcdst, srcdst);
  }
  
  static void decrypt_callback(void *priv, u8 *srcdst, unsigned int nbytes)
  {
  	const unsigned int bsize = TF_BLOCK_SIZE;
  	struct crypt_priv *ctx = priv;
  	int i;
  
  	ctx->fpu_enabled = twofish_fpu_begin(ctx->fpu_enabled, nbytes);
  
  	if (nbytes == bsize * TWOFISH_PARALLEL_BLOCKS) {
  		twofish_ecb_dec_8way(ctx->ctx, srcdst, srcdst);
  		return;
  	}
  
  	for (i = 0; i < nbytes / (bsize * 3); i++, srcdst += bsize * 3)
  		twofish_dec_blk_3way(ctx->ctx, srcdst, srcdst);
  
  	nbytes %= bsize * 3;
  
  	for (i = 0; i < nbytes / bsize; i++, srcdst += bsize)
  		twofish_dec_blk(ctx->ctx, srcdst, srcdst);
  }
  
  static int lrw_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
  		       struct scatterlist *src, unsigned int nbytes)
  {
  	struct twofish_lrw_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
  	be128 buf[TWOFISH_PARALLEL_BLOCKS];
  	struct crypt_priv crypt_ctx = {
  		.ctx = &ctx->twofish_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);
  	twofish_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 twofish_lrw_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
  	be128 buf[TWOFISH_PARALLEL_BLOCKS];
  	struct crypt_priv crypt_ctx = {
  		.ctx = &ctx->twofish_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);
  	twofish_fpu_end(crypt_ctx.fpu_enabled);
  
  	return ret;
  }
  
  static int xts_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
  		       struct scatterlist *src, unsigned int nbytes)
  {
  	struct twofish_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
  
  	return glue_xts_crypt_128bit(&twofish_enc_xts, desc, dst, src, nbytes,
  				     XTS_TWEAK_CAST(twofish_enc_blk),
  				     &ctx->tweak_ctx, &ctx->crypt_ctx);
  }
  
  static int xts_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
  		       struct scatterlist *src, unsigned int nbytes)
  {
  	struct twofish_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
  
  	return glue_xts_crypt_128bit(&twofish_dec_xts, desc, dst, src, nbytes,
  				     XTS_TWEAK_CAST(twofish_enc_blk),
  				     &ctx->tweak_ctx, &ctx->crypt_ctx);
  }
  
  static struct crypto_alg twofish_algs[10] = { {
  	.cra_name		= "__ecb-twofish-avx",
  	.cra_driver_name	= "__driver-ecb-twofish-avx",
  	.cra_priority		= 0,
  	.cra_flags		= CRYPTO_ALG_TYPE_BLKCIPHER |
  				  CRYPTO_ALG_INTERNAL,
  	.cra_blocksize		= TF_BLOCK_SIZE,
  	.cra_ctxsize		= sizeof(struct twofish_ctx),
  	.cra_alignmask		= 0,
  	.cra_type		= &crypto_blkcipher_type,
  	.cra_module		= THIS_MODULE,
  	.cra_u = {
  		.blkcipher = {
  			.min_keysize	= TF_MIN_KEY_SIZE,
  			.max_keysize	= TF_MAX_KEY_SIZE,
  			.setkey		= twofish_setkey,
  			.encrypt	= ecb_encrypt,
  			.decrypt	= ecb_decrypt,
  		},
  	},
  }, {
  	.cra_name		= "__cbc-twofish-avx",
  	.cra_driver_name	= "__driver-cbc-twofish-avx",
  	.cra_priority		= 0,
  	.cra_flags		= CRYPTO_ALG_TYPE_BLKCIPHER |
  				  CRYPTO_ALG_INTERNAL,
  	.cra_blocksize		= TF_BLOCK_SIZE,
  	.cra_ctxsize		= sizeof(struct twofish_ctx),
  	.cra_alignmask		= 0,
  	.cra_type		= &crypto_blkcipher_type,
  	.cra_module		= THIS_MODULE,
  	.cra_u = {
  		.blkcipher = {
  			.min_keysize	= TF_MIN_KEY_SIZE,
  			.max_keysize	= TF_MAX_KEY_SIZE,
  			.setkey		= twofish_setkey,
  			.encrypt	= cbc_encrypt,
  			.decrypt	= cbc_decrypt,
  		},
  	},
  }, {
  	.cra_name		= "__ctr-twofish-avx",
  	.cra_driver_name	= "__driver-ctr-twofish-avx",
  	.cra_priority		= 0,
  	.cra_flags		= CRYPTO_ALG_TYPE_BLKCIPHER |
  				  CRYPTO_ALG_INTERNAL,
  	.cra_blocksize		= 1,
  	.cra_ctxsize		= sizeof(struct twofish_ctx),
  	.cra_alignmask		= 0,
  	.cra_type		= &crypto_blkcipher_type,
  	.cra_module		= THIS_MODULE,
  	.cra_u = {
  		.blkcipher = {
  			.min_keysize	= TF_MIN_KEY_SIZE,
  			.max_keysize	= TF_MAX_KEY_SIZE,
  			.ivsize		= TF_BLOCK_SIZE,
  			.setkey		= twofish_setkey,
  			.encrypt	= ctr_crypt,
  			.decrypt	= ctr_crypt,
  		},
  	},
  }, {
  	.cra_name		= "__lrw-twofish-avx",
  	.cra_driver_name	= "__driver-lrw-twofish-avx",
  	.cra_priority		= 0,
  	.cra_flags		= CRYPTO_ALG_TYPE_BLKCIPHER |
  				  CRYPTO_ALG_INTERNAL,
  	.cra_blocksize		= TF_BLOCK_SIZE,
  	.cra_ctxsize		= sizeof(struct twofish_lrw_ctx),
  	.cra_alignmask		= 0,
  	.cra_type		= &crypto_blkcipher_type,
  	.cra_module		= THIS_MODULE,
  	.cra_exit		= lrw_twofish_exit_tfm,
  	.cra_u = {
  		.blkcipher = {
  			.min_keysize	= TF_MIN_KEY_SIZE +
  					  TF_BLOCK_SIZE,
  			.max_keysize	= TF_MAX_KEY_SIZE +
  					  TF_BLOCK_SIZE,
  			.ivsize		= TF_BLOCK_SIZE,
  			.setkey		= lrw_twofish_setkey,
  			.encrypt	= lrw_encrypt,
  			.decrypt	= lrw_decrypt,
  		},
  	},
  }, {
  	.cra_name		= "__xts-twofish-avx",
  	.cra_driver_name	= "__driver-xts-twofish-avx",
  	.cra_priority		= 0,
  	.cra_flags		= CRYPTO_ALG_TYPE_BLKCIPHER |
  				  CRYPTO_ALG_INTERNAL,
  	.cra_blocksize		= TF_BLOCK_SIZE,
  	.cra_ctxsize		= sizeof(struct twofish_xts_ctx),
  	.cra_alignmask		= 0,
  	.cra_type		= &crypto_blkcipher_type,
  	.cra_module		= THIS_MODULE,
  	.cra_u = {
  		.blkcipher = {
  			.min_keysize	= TF_MIN_KEY_SIZE * 2,
  			.max_keysize	= TF_MAX_KEY_SIZE * 2,
  			.ivsize		= TF_BLOCK_SIZE,
  			.setkey		= xts_twofish_setkey,
  			.encrypt	= xts_encrypt,
  			.decrypt	= xts_decrypt,
  		},
  	},
  }, {
  	.cra_name		= "ecb(twofish)",
  	.cra_driver_name	= "ecb-twofish-avx",
  	.cra_priority		= 400,
  	.cra_flags		= CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
  	.cra_blocksize		= TF_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	= TF_MIN_KEY_SIZE,
  			.max_keysize	= TF_MAX_KEY_SIZE,
  			.setkey		= ablk_set_key,
  			.encrypt	= ablk_encrypt,
  			.decrypt	= ablk_decrypt,
  		},
  	},
  }, {
  	.cra_name		= "cbc(twofish)",
  	.cra_driver_name	= "cbc-twofish-avx",
  	.cra_priority		= 400,
  	.cra_flags		= CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
  	.cra_blocksize		= TF_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	= TF_MIN_KEY_SIZE,
  			.max_keysize	= TF_MAX_KEY_SIZE,
  			.ivsize		= TF_BLOCK_SIZE,
  			.setkey		= ablk_set_key,
  			.encrypt	= __ablk_encrypt,
  			.decrypt	= ablk_decrypt,
  		},
  	},
  }, {
  	.cra_name		= "ctr(twofish)",
  	.cra_driver_name	= "ctr-twofish-avx",
  	.cra_priority		= 400,
  	.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	= TF_MIN_KEY_SIZE,
  			.max_keysize	= TF_MAX_KEY_SIZE,
  			.ivsize		= TF_BLOCK_SIZE,
  			.setkey		= ablk_set_key,
  			.encrypt	= ablk_encrypt,
  			.decrypt	= ablk_encrypt,
  			.geniv		= "chainiv",
  		},
  	},
  }, {
  	.cra_name		= "lrw(twofish)",
  	.cra_driver_name	= "lrw-twofish-avx",
  	.cra_priority		= 400,
  	.cra_flags		= CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
  	.cra_blocksize		= TF_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	= TF_MIN_KEY_SIZE +
  					  TF_BLOCK_SIZE,
  			.max_keysize	= TF_MAX_KEY_SIZE +
  					  TF_BLOCK_SIZE,
  			.ivsize		= TF_BLOCK_SIZE,
  			.setkey		= ablk_set_key,
  			.encrypt	= ablk_encrypt,
  			.decrypt	= ablk_decrypt,
  		},
  	},
  }, {
  	.cra_name		= "xts(twofish)",
  	.cra_driver_name	= "xts-twofish-avx",
  	.cra_priority		= 400,
  	.cra_flags		= CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
  	.cra_blocksize		= TF_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	= TF_MIN_KEY_SIZE * 2,
  			.max_keysize	= TF_MAX_KEY_SIZE * 2,
  			.ivsize		= TF_BLOCK_SIZE,
  			.setkey		= ablk_set_key,
  			.encrypt	= ablk_encrypt,
  			.decrypt	= ablk_decrypt,
  		},
  	},
  } };
  
  static int __init twofish_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(twofish_algs, ARRAY_SIZE(twofish_algs));
  }
  
  static void __exit twofish_exit(void)
  {
  	crypto_unregister_algs(twofish_algs, ARRAY_SIZE(twofish_algs));
  }
  
  module_init(twofish_init);
  module_exit(twofish_exit);
  
  MODULE_DESCRIPTION("Twofish Cipher Algorithm, AVX optimized");
  MODULE_LICENSE("GPL");
  MODULE_ALIAS_CRYPTO("twofish");
  