[deliverable/linux.git] / arch / x86 / crypto / cast5_avx_glue.c

/*
 * Glue Code for the AVX assembler implemention of the Cast5 Cipher
 *
 * Copyright (C) 2012 Johannes Goetzfried
 *     <Johannes.Goetzfried@informatik.stud.uni-erlangen.de>
 *
 * 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/algapi.h>
#include <crypto/cast5.h>
#include <crypto/cryptd.h>
#include <crypto/ctr.h>
#include <asm/xcr.h>
#include <asm/xsave.h>
#include <asm/crypto/ablk_helper.h>
#include <asm/crypto/glue_helper.h>

#define CAST5_PARALLEL_BLOCKS 16

asmlinkage void cast5_ecb_enc_16way(struct cast5_ctx *ctx, u8 *dst,
				    const u8 *src);
asmlinkage void cast5_ecb_dec_16way(struct cast5_ctx *ctx, u8 *dst,
				    const u8 *src);
asmlinkage void cast5_cbc_dec_16way(struct cast5_ctx *ctx, u8 *dst,
				    const u8 *src);
asmlinkage void cast5_ctr_16way(struct cast5_ctx *ctx, u8 *dst, const u8 *src,
				__be64 *iv);

static inline bool cast5_fpu_begin(bool fpu_enabled, unsigned int nbytes)
{
	return glue_fpu_begin(CAST5_BLOCK_SIZE, CAST5_PARALLEL_BLOCKS,
			      NULL, fpu_enabled, nbytes);
}

static inline void cast5_fpu_end(bool fpu_enabled)
{
	return glue_fpu_end(fpu_enabled);
}

static int ecb_crypt(struct blkcipher_desc *desc, struct blkcipher_walk *walk,
		     bool enc)
{
	bool fpu_enabled = false;
	struct cast5_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
	const unsigned int bsize = CAST5_BLOCK_SIZE;
	unsigned int nbytes;
	void (*fn)(struct cast5_ctx *ctx, u8 *dst, const u8 *src);
	int err;

	fn = (enc) ? cast5_ecb_enc_16way : cast5_ecb_dec_16way;

	err = blkcipher_walk_virt(desc, walk);
	desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;

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

		fpu_enabled = cast5_fpu_begin(fpu_enabled, nbytes);

		/* Process multi-block batch */
		if (nbytes >= bsize * CAST5_PARALLEL_BLOCKS) {
			do {
				fn(ctx, wdst, wsrc);

				wsrc += bsize * CAST5_PARALLEL_BLOCKS;
				wdst += bsize * CAST5_PARALLEL_BLOCKS;
				nbytes -= bsize * CAST5_PARALLEL_BLOCKS;
			} while (nbytes >= bsize * CAST5_PARALLEL_BLOCKS);

			if (nbytes < bsize)
				goto done;
		}

		fn = (enc) ? __cast5_encrypt : __cast5_decrypt;

		/* Handle leftovers */
		do {
			fn(ctx, wdst, wsrc);

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

done:
		err = blkcipher_walk_done(desc, walk, nbytes);
	}

	cast5_fpu_end(fpu_enabled);
	return err;
}

static int ecb_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
		       struct scatterlist *src, unsigned int nbytes)
{
	struct blkcipher_walk walk;

	blkcipher_walk_init(&walk, dst, src, nbytes);
	return ecb_crypt(desc, &walk, true);
}

static int ecb_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
		       struct scatterlist *src, unsigned int nbytes)
{
	struct blkcipher_walk walk;

	blkcipher_walk_init(&walk, dst, src, nbytes);
	return ecb_crypt(desc, &walk, false);
}

static unsigned int __cbc_encrypt(struct blkcipher_desc *desc,
				  struct blkcipher_walk *walk)
{
	struct cast5_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
	const unsigned int bsize = CAST5_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;
		__cast5_encrypt(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 blkcipher_desc *desc, struct scatterlist *dst,
		       struct scatterlist *src, unsigned int nbytes)
{
	struct blkcipher_walk walk;
	int err;

	blkcipher_walk_init(&walk, dst, src, nbytes);
	err = blkcipher_walk_virt(desc, &walk);

	while ((nbytes = walk.nbytes)) {
		nbytes = __cbc_encrypt(desc, &walk);
		err = blkcipher_walk_done(desc, &walk, nbytes);
	}

	return err;
}

static unsigned int __cbc_decrypt(struct blkcipher_desc *desc,
				  struct blkcipher_walk *walk)
{
	struct cast5_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
	const unsigned int bsize = CAST5_BLOCK_SIZE;
	unsigned int nbytes = walk->nbytes;
	u64 *src = (u64 *)walk->src.virt.addr;
	u64 *dst = (u64 *)walk->dst.virt.addr;
	u64 last_iv;

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

	last_iv = *src;

	/* Process multi-block batch */
	if (nbytes >= bsize * CAST5_PARALLEL_BLOCKS) {
		do {
			nbytes -= bsize * (CAST5_PARALLEL_BLOCKS - 1);
			src -= CAST5_PARALLEL_BLOCKS - 1;
			dst -= CAST5_PARALLEL_BLOCKS - 1;

			cast5_cbc_dec_16way(ctx, (u8 *)dst, (u8 *)src);

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

			*dst ^= *(src - 1);
			src -= 1;
			dst -= 1;
		} while (nbytes >= bsize * CAST5_PARALLEL_BLOCKS);

		if (nbytes < bsize)
			goto done;
	}

	/* Handle leftovers */
	for (;;) {
		__cast5_decrypt(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 blkcipher_desc *desc, struct scatterlist *dst,
		       struct scatterlist *src, unsigned int nbytes)
{
	bool fpu_enabled = false;
	struct blkcipher_walk walk;
	int err;

	blkcipher_walk_init(&walk, dst, src, nbytes);
	err = blkcipher_walk_virt(desc, &walk);
	desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;

	while ((nbytes = walk.nbytes)) {
		fpu_enabled = cast5_fpu_begin(fpu_enabled, nbytes);
		nbytes = __cbc_decrypt(desc, &walk);
		err = blkcipher_walk_done(desc, &walk, nbytes);
	}

	cast5_fpu_end(fpu_enabled);
	return err;
}

static void ctr_crypt_final(struct blkcipher_desc *desc,
			    struct blkcipher_walk *walk)
{
	struct cast5_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
	u8 *ctrblk = walk->iv;
	u8 keystream[CAST5_BLOCK_SIZE];
	u8 *src = walk->src.virt.addr;
	u8 *dst = walk->dst.virt.addr;
	unsigned int nbytes = walk->nbytes;

	__cast5_encrypt(ctx, keystream, ctrblk);
	crypto_xor(keystream, src, nbytes);
	memcpy(dst, keystream, nbytes);

	crypto_inc(ctrblk, CAST5_BLOCK_SIZE);
}

static unsigned int __ctr_crypt(struct blkcipher_desc *desc,
				struct blkcipher_walk *walk)
{
	struct cast5_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
	const unsigned int bsize = CAST5_BLOCK_SIZE;
	unsigned int nbytes = walk->nbytes;
	u64 *src = (u64 *)walk->src.virt.addr;
	u64 *dst = (u64 *)walk->dst.virt.addr;

	/* Process multi-block batch */
	if (nbytes >= bsize * CAST5_PARALLEL_BLOCKS) {
		do {
			cast5_ctr_16way(ctx, (u8 *)dst, (u8 *)src,
					(__be64 *)walk->iv);

			src += CAST5_PARALLEL_BLOCKS;
			dst += CAST5_PARALLEL_BLOCKS;
			nbytes -= bsize * CAST5_PARALLEL_BLOCKS;
		} while (nbytes >= bsize * CAST5_PARALLEL_BLOCKS);

		if (nbytes < bsize)
			goto done;
	}

	/* Handle leftovers */
	do {
		u64 ctrblk;

		if (dst != src)
			*dst = *src;

		ctrblk = *(u64 *)walk->iv;
		be64_add_cpu((__be64 *)walk->iv, 1);

		__cast5_encrypt(ctx, (u8 *)&ctrblk, (u8 *)&ctrblk);
		*dst ^= ctrblk;

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

done:
	return nbytes;
}

static int ctr_crypt(struct blkcipher_desc *desc, struct scatterlist *dst,
		     struct scatterlist *src, unsigned int nbytes)
{
	bool fpu_enabled = false;
	struct blkcipher_walk walk;
	int err;

	blkcipher_walk_init(&walk, dst, src, nbytes);
	err = blkcipher_walk_virt_block(desc, &walk, CAST5_BLOCK_SIZE);
	desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;

	while ((nbytes = walk.nbytes) >= CAST5_BLOCK_SIZE) {
		fpu_enabled = cast5_fpu_begin(fpu_enabled, nbytes);
		nbytes = __ctr_crypt(desc, &walk);
		err = blkcipher_walk_done(desc, &walk, nbytes);
	}

	cast5_fpu_end(fpu_enabled);

	if (walk.nbytes) {
		ctr_crypt_final(desc, &walk);
		err = blkcipher_walk_done(desc, &walk, 0);
	}

	return err;
}


static struct crypto_alg cast5_algs[6] = { {
	.cra_name		= "__ecb-cast5-avx",
	.cra_driver_name	= "__driver-ecb-cast5-avx",
	.cra_priority		= 0,
	.cra_flags		= CRYPTO_ALG_TYPE_BLKCIPHER,
	.cra_blocksize		= CAST5_BLOCK_SIZE,
	.cra_ctxsize		= sizeof(struct cast5_ctx),
	.cra_alignmask		= 0,
	.cra_type		= &crypto_blkcipher_type,
	.cra_module		= THIS_MODULE,
	.cra_u = {
		.blkcipher = {
			.min_keysize	= CAST5_MIN_KEY_SIZE,
			.max_keysize	= CAST5_MAX_KEY_SIZE,
			.setkey		= cast5_setkey,
			.encrypt	= ecb_encrypt,
			.decrypt	= ecb_decrypt,
		},
	},
}, {
	.cra_name		= "__cbc-cast5-avx",
	.cra_driver_name	= "__driver-cbc-cast5-avx",
	.cra_priority		= 0,
	.cra_flags		= CRYPTO_ALG_TYPE_BLKCIPHER,
	.cra_blocksize		= CAST5_BLOCK_SIZE,
	.cra_ctxsize		= sizeof(struct cast5_ctx),
	.cra_alignmask		= 0,
	.cra_type		= &crypto_blkcipher_type,
	.cra_module		= THIS_MODULE,
	.cra_u = {
		.blkcipher = {
			.min_keysize	= CAST5_MIN_KEY_SIZE,
			.max_keysize	= CAST5_MAX_KEY_SIZE,
			.setkey		= cast5_setkey,
			.encrypt	= cbc_encrypt,
			.decrypt	= cbc_decrypt,
		},
	},
}, {
	.cra_name		= "__ctr-cast5-avx",
	.cra_driver_name	= "__driver-ctr-cast5-avx",
	.cra_priority		= 0,
	.cra_flags		= CRYPTO_ALG_TYPE_BLKCIPHER,
	.cra_blocksize		= 1,
	.cra_ctxsize		= sizeof(struct cast5_ctx),
	.cra_alignmask		= 0,
	.cra_type		= &crypto_blkcipher_type,
	.cra_module		= THIS_MODULE,
	.cra_u = {
		.blkcipher = {
			.min_keysize	= CAST5_MIN_KEY_SIZE,
			.max_keysize	= CAST5_MAX_KEY_SIZE,
			.ivsize		= CAST5_BLOCK_SIZE,
			.setkey		= cast5_setkey,
			.encrypt	= ctr_crypt,
			.decrypt	= ctr_crypt,
		},
	},
}, {
	.cra_name		= "ecb(cast5)",
	.cra_driver_name	= "ecb-cast5-avx",
	.cra_priority		= 200,
	.cra_flags		= CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
	.cra_blocksize		= CAST5_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	= CAST5_MIN_KEY_SIZE,
			.max_keysize	= CAST5_MAX_KEY_SIZE,
			.setkey		= ablk_set_key,
			.encrypt	= ablk_encrypt,
			.decrypt	= ablk_decrypt,
		},
	},
}, {
	.cra_name		= "cbc(cast5)",
	.cra_driver_name	= "cbc-cast5-avx",
	.cra_priority		= 200,
	.cra_flags		= CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
	.cra_blocksize		= CAST5_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	= CAST5_MIN_KEY_SIZE,
			.max_keysize	= CAST5_MAX_KEY_SIZE,
			.ivsize		= CAST5_BLOCK_SIZE,
			.setkey		= ablk_set_key,
			.encrypt	= __ablk_encrypt,
			.decrypt	= ablk_decrypt,
		},
	},
}, {
	.cra_name		= "ctr(cast5)",
	.cra_driver_name	= "ctr-cast5-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	= CAST5_MIN_KEY_SIZE,
			.max_keysize	= CAST5_MAX_KEY_SIZE,
			.ivsize		= CAST5_BLOCK_SIZE,
			.setkey		= ablk_set_key,
			.encrypt	= ablk_encrypt,
			.decrypt	= ablk_encrypt,
			.geniv		= "chainiv",
		},
	},
} };

static int __init cast5_init(void)
{
	u64 xcr0;

	if (!cpu_has_avx || !cpu_has_osxsave) {
		pr_info("AVX instructions are not detected.\n");
		return -ENODEV;
	}

	xcr0 = xgetbv(XCR_XFEATURE_ENABLED_MASK);
	if ((xcr0 & (XSTATE_SSE | XSTATE_YMM)) != (XSTATE_SSE | XSTATE_YMM)) {
		pr_info("AVX detected but unusable.\n");
		return -ENODEV;
	}

	return crypto_register_algs(cast5_algs, ARRAY_SIZE(cast5_algs));
}

static void __exit cast5_exit(void)
{
	crypto_unregister_algs(cast5_algs, ARRAY_SIZE(cast5_algs));
}

module_init(cast5_init);
module_exit(cast5_exit);

MODULE_DESCRIPTION("Cast5 Cipher Algorithm, AVX optimized");
MODULE_LICENSE("GPL");
MODULE_ALIAS("cast5");
Commit	Line	Data
4d6d6a2c JG	1	/*
	2	* Glue Code for the AVX assembler implemention of the Cast5 Cipher
	3	*
	4	* Copyright (C) 2012 Johannes Goetzfried
	5	* <Johannes.Goetzfried@informatik.stud.uni-erlangen.de>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
	20	* USA
	21	*
	22	*/
	23
	24	#include <linux/module.h>
	25	#include <linux/hardirq.h>
	26	#include <linux/types.h>
	27	#include <linux/crypto.h>
	28	#include <linux/err.h>
	29	#include <crypto/algapi.h>
	30	#include <crypto/cast5.h>
	31	#include <crypto/cryptd.h>
	32	#include <crypto/ctr.h>
	33	#include <asm/xcr.h>
	34	#include <asm/xsave.h>
	35	#include <asm/crypto/ablk_helper.h>
	36	#include <asm/crypto/glue_helper.h>
	37
	38	#define CAST5_PARALLEL_BLOCKS 16
	39
c12ab20b	40	asmlinkage void cast5_ecb_enc_16way(struct cast5_ctx ctx, u8 dst,
4d6d6a2c	41	const u8 *src);
c12ab20b JK	42	asmlinkage void cast5_ecb_dec_16way(struct cast5_ctx ctx, u8 dst,
	43	const u8 *src);
	44	asmlinkage void cast5_cbc_dec_16way(struct cast5_ctx ctx, u8 dst,
	45	const u8 *src);
	46	asmlinkage void cast5_ctr_16way(struct cast5_ctx ctx, u8 dst, const u8 *src,
	47	__be64 *iv);
4d6d6a2c JG	48
	49	static inline bool cast5_fpu_begin(bool fpu_enabled, unsigned int nbytes)
	50	{
	51	return glue_fpu_begin(CAST5_BLOCK_SIZE, CAST5_PARALLEL_BLOCKS,
	52	NULL, fpu_enabled, nbytes);
	53	}
	54
	55	static inline void cast5_fpu_end(bool fpu_enabled)
	56	{
	57	return glue_fpu_end(fpu_enabled);
	58	}
	59
	60	static int ecb_crypt(struct blkcipher_desc desc, struct blkcipher_walk walk,
	61	bool enc)
	62	{
	63	bool fpu_enabled = false;
	64	struct cast5_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
	65	const unsigned int bsize = CAST5_BLOCK_SIZE;
	66	unsigned int nbytes;
c12ab20b	67	void (fn)(struct cast5_ctx ctx, u8 dst, const u8 src);
4d6d6a2c JG	68	int err;
4d6d6a2c JG	69
c12ab20b JK	70	fn = (enc) ? cast5_ecb_enc_16way : cast5_ecb_dec_16way;
c12ab20b JK	71
4d6d6a2c JG	72	err = blkcipher_walk_virt(desc, walk);
	73	desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
	74
	75	while ((nbytes = walk->nbytes)) {
	76	u8 *wsrc = walk->src.virt.addr;
	77	u8 *wdst = walk->dst.virt.addr;
	78
	79	fpu_enabled = cast5_fpu_begin(fpu_enabled, nbytes);
	80
	81	/* Process multi-block batch */
	82	if (nbytes >= bsize * CAST5_PARALLEL_BLOCKS) {
	83	do {
c12ab20b	84	fn(ctx, wdst, wsrc);
4d6d6a2c JG	85
	86	wsrc += bsize * CAST5_PARALLEL_BLOCKS;
	87	wdst += bsize * CAST5_PARALLEL_BLOCKS;
	88	nbytes -= bsize * CAST5_PARALLEL_BLOCKS;
	89	} while (nbytes >= bsize * CAST5_PARALLEL_BLOCKS);
	90
	91	if (nbytes < bsize)
	92	goto done;
	93	}
	94
c12ab20b JK	95	fn = (enc) ? __cast5_encrypt : __cast5_decrypt;
c12ab20b JK	96
4d6d6a2c JG	97	/* Handle leftovers */
4d6d6a2c JG	98	do {
c12ab20b	99	fn(ctx, wdst, wsrc);
4d6d6a2c JG	100
	101	wsrc += bsize;
	102	wdst += bsize;
	103	nbytes -= bsize;
	104	} while (nbytes >= bsize);
	105
	106	done:
	107	err = blkcipher_walk_done(desc, walk, nbytes);
	108	}
	109
	110	cast5_fpu_end(fpu_enabled);
	111	return err;
	112	}
	113
	114	static int ecb_encrypt(struct blkcipher_desc desc, struct scatterlist dst,
	115	struct scatterlist *src, unsigned int nbytes)
	116	{
	117	struct blkcipher_walk walk;
	118
	119	blkcipher_walk_init(&walk, dst, src, nbytes);
	120	return ecb_crypt(desc, &walk, true);
	121	}
	122
	123	static int ecb_decrypt(struct blkcipher_desc desc, struct scatterlist dst,
	124	struct scatterlist *src, unsigned int nbytes)
	125	{
	126	struct blkcipher_walk walk;
	127
	128	blkcipher_walk_init(&walk, dst, src, nbytes);
	129	return ecb_crypt(desc, &walk, false);
	130	}
	131
	132	static unsigned int __cbc_encrypt(struct blkcipher_desc *desc,
	133	struct blkcipher_walk *walk)
	134	{
	135	struct cast5_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
	136	const unsigned int bsize = CAST5_BLOCK_SIZE;
	137	unsigned int nbytes = walk->nbytes;
	138	u64 src = (u64 )walk->src.virt.addr;
	139	u64 dst = (u64 )walk->dst.virt.addr;
	140	u64 iv = (u64 )walk->iv;
	141
	142	do {
	143	dst = src ^ *iv;
	144	__cast5_encrypt(ctx, (u8 )dst, (u8 )dst);
	145	iv = dst;
	146
	147	src += 1;
	148	dst += 1;
	149	nbytes -= bsize;
	150	} while (nbytes >= bsize);
	151
200429cc	152	(u64 )walk->iv = *iv;
4d6d6a2c JG	153	return nbytes;
	154	}
	155
	156	static int cbc_encrypt(struct blkcipher_desc desc, struct scatterlist dst,
	157	struct scatterlist *src, unsigned int nbytes)
	158	{
	159	struct blkcipher_walk walk;
	160	int err;
	161
	162	blkcipher_walk_init(&walk, dst, src, nbytes);
	163	err = blkcipher_walk_virt(desc, &walk);
	164
	165	while ((nbytes = walk.nbytes)) {
	166	nbytes = __cbc_encrypt(desc, &walk);
	167	err = blkcipher_walk_done(desc, &walk, nbytes);
	168	}
	169
	170	return err;
	171	}
	172
	173	static unsigned int __cbc_decrypt(struct blkcipher_desc *desc,
	174	struct blkcipher_walk *walk)
	175	{
	176	struct cast5_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
	177	const unsigned int bsize = CAST5_BLOCK_SIZE;
	178	unsigned int nbytes = walk->nbytes;
	179	u64 src = (u64 )walk->src.virt.addr;
	180	u64 dst = (u64 )walk->dst.virt.addr;
4d6d6a2c	181	u64 last_iv;
4d6d6a2c JG	182
	183	/* Start of the last block. */
	184	src += nbytes / bsize - 1;
	185	dst += nbytes / bsize - 1;
	186
	187	last_iv = *src;
	188
	189	/* Process multi-block batch */
	190	if (nbytes >= bsize * CAST5_PARALLEL_BLOCKS) {
	191	do {
	192	nbytes -= bsize * (CAST5_PARALLEL_BLOCKS - 1);
	193	src -= CAST5_PARALLEL_BLOCKS - 1;
	194	dst -= CAST5_PARALLEL_BLOCKS - 1;
	195
c12ab20b	196	cast5_cbc_dec_16way(ctx, (u8 )dst, (u8 )src);
4d6d6a2c JG	197
	198	nbytes -= bsize;
	199	if (nbytes < bsize)
	200	goto done;
	201
	202	dst ^= (src - 1);
	203	src -= 1;
	204	dst -= 1;
	205	} while (nbytes >= bsize * CAST5_PARALLEL_BLOCKS);
	206
	207	if (nbytes < bsize)
	208	goto done;
	209	}
	210
	211	/* Handle leftovers */
	212	for (;;) {
	213	__cast5_decrypt(ctx, (u8 )dst, (u8 )src);
	214
	215	nbytes -= bsize;
	216	if (nbytes < bsize)
	217	break;
	218
	219	dst ^= (src - 1);
	220	src -= 1;
	221	dst -= 1;
	222	}
	223
	224	done:
	225	dst ^= (u64 *)walk->iv;
	226	(u64 )walk->iv = last_iv;
	227
	228	return nbytes;
	229	}
	230
	231	static int cbc_decrypt(struct blkcipher_desc desc, struct scatterlist dst,
	232	struct scatterlist *src, unsigned int nbytes)
	233	{
	234	bool fpu_enabled = false;
	235	struct blkcipher_walk walk;
	236	int err;
	237
	238	blkcipher_walk_init(&walk, dst, src, nbytes);
	239	err = blkcipher_walk_virt(desc, &walk);
	240	desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
	241
	242	while ((nbytes = walk.nbytes)) {
	243	fpu_enabled = cast5_fpu_begin(fpu_enabled, nbytes);
	244	nbytes = __cbc_decrypt(desc, &walk);
	245	err = blkcipher_walk_done(desc, &walk, nbytes);
	246	}
	247
	248	cast5_fpu_end(fpu_enabled);
	249	return err;
	250	}
	251
	252	static void ctr_crypt_final(struct blkcipher_desc *desc,
	253	struct blkcipher_walk *walk)
	254	{
	255	struct cast5_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
	256	u8 *ctrblk = walk->iv;
	257	u8 keystream[CAST5_BLOCK_SIZE];
	258	u8 *src = walk->src.virt.addr;
	259	u8 *dst = walk->dst.virt.addr;
	260	unsigned int nbytes = walk->nbytes;
261
262	__cast5_encrypt(ctx, keystream, ctrblk);
263	crypto_xor(keystream, src, nbytes);
264	memcpy(dst, keystream, nbytes);
265
266	crypto_inc(ctrblk, CAST5_BLOCK_SIZE);
267	}
268
269	static unsigned int __ctr_crypt(struct blkcipher_desc *desc,
270	struct blkcipher_walk *walk)
271	{
272	struct cast5_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
273	const unsigned int bsize = CAST5_BLOCK_SIZE;
274	unsigned int nbytes = walk->nbytes;
275	u64 src = (u64 )walk->src.virt.addr;
276	u64 dst = (u64 )walk->dst.virt.addr;
4d6d6a2c JG	277
	278	/* Process multi-block batch */
	279	if (nbytes >= bsize * CAST5_PARALLEL_BLOCKS) {
	280	do {
c12ab20b JK	281	cast5_ctr_16way(ctx, (u8 )dst, (u8 )src,
c12ab20b JK	282	(__be64 *)walk->iv);
4d6d6a2c JG	283
	284	src += CAST5_PARALLEL_BLOCKS;
	285	dst += CAST5_PARALLEL_BLOCKS;
	286	nbytes -= bsize * CAST5_PARALLEL_BLOCKS;
	287	} while (nbytes >= bsize * CAST5_PARALLEL_BLOCKS);
	288
	289	if (nbytes < bsize)
	290	goto done;
	291	}
	292
	293	/* Handle leftovers */
	294	do {
c12ab20b JK	295	u64 ctrblk;
c12ab20b JK	296
4d6d6a2c JG	297	if (dst != src)
	298	dst = src;
	299
c12ab20b JK	300	ctrblk = (u64 )walk->iv;
c12ab20b JK	301	be64_add_cpu((__be64 *)walk->iv, 1);
4d6d6a2c	302
c12ab20b JK	303	__cast5_encrypt(ctx, (u8 )&ctrblk, (u8 )&ctrblk);
c12ab20b JK	304	*dst ^= ctrblk;
4d6d6a2c JG	305
	306	src += 1;
	307	dst += 1;
	308	nbytes -= bsize;
	309	} while (nbytes >= bsize);
	310
	311	done:
4d6d6a2c JG	312	return nbytes;
	313	}
	314
	315	static int ctr_crypt(struct blkcipher_desc desc, struct scatterlist dst,
	316	struct scatterlist *src, unsigned int nbytes)
	317	{
	318	bool fpu_enabled = false;
	319	struct blkcipher_walk walk;
	320	int err;
	321
	322	blkcipher_walk_init(&walk, dst, src, nbytes);
	323	err = blkcipher_walk_virt_block(desc, &walk, CAST5_BLOCK_SIZE);
	324	desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
	325
	326	while ((nbytes = walk.nbytes) >= CAST5_BLOCK_SIZE) {
	327	fpu_enabled = cast5_fpu_begin(fpu_enabled, nbytes);
	328	nbytes = __ctr_crypt(desc, &walk);
	329	err = blkcipher_walk_done(desc, &walk, nbytes);
	330	}
	331
	332	cast5_fpu_end(fpu_enabled);
	333
	334	if (walk.nbytes) {
	335	ctr_crypt_final(desc, &walk);
	336	err = blkcipher_walk_done(desc, &walk, 0);
	337	}
	338
	339	return err;
	340	}
	341
	342
	343	static struct crypto_alg cast5_algs[6] = { {
	344	.cra_name = "__ecb-cast5-avx",
	345	.cra_driver_name = "__driver-ecb-cast5-avx",
	346	.cra_priority = 0,
	347	.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
	348	.cra_blocksize = CAST5_BLOCK_SIZE,
	349	.cra_ctxsize = sizeof(struct cast5_ctx),
	350	.cra_alignmask = 0,
	351	.cra_type = &crypto_blkcipher_type,
	352	.cra_module = THIS_MODULE,
	353	.cra_u = {
	354	.blkcipher = {
	355	.min_keysize = CAST5_MIN_KEY_SIZE,
	356	.max_keysize = CAST5_MAX_KEY_SIZE,
	357	.setkey = cast5_setkey,
	358	.encrypt = ecb_encrypt,
	359	.decrypt = ecb_decrypt,
	360	},
	361	},
	362	}, {
	363	.cra_name = "__cbc-cast5-avx",
	364	.cra_driver_name = "__driver-cbc-cast5-avx",
	365	.cra_priority = 0,
	366	.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
	367	.cra_blocksize = CAST5_BLOCK_SIZE,
	368	.cra_ctxsize = sizeof(struct cast5_ctx),
	369	.cra_alignmask = 0,
	370	.cra_type = &crypto_blkcipher_type,
	371	.cra_module = THIS_MODULE,
	372	.cra_u = {
	373	.blkcipher = {
	374	.min_keysize = CAST5_MIN_KEY_SIZE,
	375	.max_keysize = CAST5_MAX_KEY_SIZE,
376	.setkey = cast5_setkey,
377	.encrypt = cbc_encrypt,
378	.decrypt = cbc_decrypt,
379	},
380	},
381	}, {
382	.cra_name = "__ctr-cast5-avx",
383	.cra_driver_name = "__driver-ctr-cast5-avx",
384	.cra_priority = 0,
385	.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
386	.cra_blocksize = 1,
387	.cra_ctxsize = sizeof(struct cast5_ctx),
388	.cra_alignmask = 0,
389	.cra_type = &crypto_blkcipher_type,
390	.cra_module = THIS_MODULE,
391	.cra_u = {
392	.blkcipher = {
393	.min_keysize = CAST5_MIN_KEY_SIZE,
394	.max_keysize = CAST5_MAX_KEY_SIZE,
395	.ivsize = CAST5_BLOCK_SIZE,
396	.setkey = cast5_setkey,
397	.encrypt = ctr_crypt,
398	.decrypt = ctr_crypt,
399	},
400	},
401	}, {
402	.cra_name = "ecb(cast5)",
403	.cra_driver_name = "ecb-cast5-avx",
404	.cra_priority = 200,
405	.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER \| CRYPTO_ALG_ASYNC,
406	.cra_blocksize = CAST5_BLOCK_SIZE,
407	.cra_ctxsize = sizeof(struct async_helper_ctx),
408	.cra_alignmask = 0,
409	.cra_type = &crypto_ablkcipher_type,
410	.cra_module = THIS_MODULE,
411	.cra_init = ablk_init,
412	.cra_exit = ablk_exit,
413	.cra_u = {
414	.ablkcipher = {
415	.min_keysize = CAST5_MIN_KEY_SIZE,
416	.max_keysize = CAST5_MAX_KEY_SIZE,
417	.setkey = ablk_set_key,
418	.encrypt = ablk_encrypt,
419	.decrypt = ablk_decrypt,
420	},
421	},
422	}, {
423	.cra_name = "cbc(cast5)",
424	.cra_driver_name = "cbc-cast5-avx",
425	.cra_priority = 200,
426	.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER \| CRYPTO_ALG_ASYNC,
427	.cra_blocksize = CAST5_BLOCK_SIZE,
428	.cra_ctxsize = sizeof(struct async_helper_ctx),
429	.cra_alignmask = 0,
430	.cra_type = &crypto_ablkcipher_type,
431	.cra_module = THIS_MODULE,
432	.cra_init = ablk_init,
433	.cra_exit = ablk_exit,
434	.cra_u = {
435	.ablkcipher = {
436	.min_keysize = CAST5_MIN_KEY_SIZE,
437	.max_keysize = CAST5_MAX_KEY_SIZE,
438	.ivsize = CAST5_BLOCK_SIZE,
439	.setkey = ablk_set_key,
440	.encrypt = __ablk_encrypt,
441	.decrypt = ablk_decrypt,
442	},
443	},
444	}, {
445	.cra_name = "ctr(cast5)",
446	.cra_driver_name = "ctr-cast5-avx",
447	.cra_priority = 200,
448	.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER \| CRYPTO_ALG_ASYNC,
449	.cra_blocksize = 1,
450	.cra_ctxsize = sizeof(struct async_helper_ctx),
451	.cra_alignmask = 0,
452	.cra_type = &crypto_ablkcipher_type,
453	.cra_module = THIS_MODULE,
454	.cra_init = ablk_init,
455	.cra_exit = ablk_exit,
456	.cra_u = {
457	.ablkcipher = {
458	.min_keysize = CAST5_MIN_KEY_SIZE,
459	.max_keysize = CAST5_MAX_KEY_SIZE,
460	.ivsize = CAST5_BLOCK_SIZE,
461	.setkey = ablk_set_key,
462	.encrypt = ablk_encrypt,
463	.decrypt = ablk_encrypt,
464	.geniv = "chainiv",
465	},
466	},
467	} };
468
469	static int __init cast5_init(void)
470	{
471	u64 xcr0;
472
473	if (!cpu_has_avx \|\| !cpu_has_osxsave) {
474	pr_info("AVX instructions are not detected.\n");
475	return -ENODEV;
476	}
477
478	xcr0 = xgetbv(XCR_XFEATURE_ENABLED_MASK);
479	if ((xcr0 & (XSTATE_SSE \| XSTATE_YMM)) != (XSTATE_SSE \| XSTATE_YMM)) {
480	pr_info("AVX detected but unusable.\n");
481	return -ENODEV;
482	}
483
484	return crypto_register_algs(cast5_algs, ARRAY_SIZE(cast5_algs));
485	}
486
487	static void __exit cast5_exit(void)
488	{
489	crypto_unregister_algs(cast5_algs, ARRAY_SIZE(cast5_algs));
490	}
491
492	module_init(cast5_init);
493	module_exit(cast5_exit);
494
495	MODULE_DESCRIPTION("Cast5 Cipher Algorithm, AVX optimized");
496	MODULE_LICENSE("GPL");
497	MODULE_ALIAS("cast5");