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

/*
 * Glue Code for assembler optimized version of Blowfish
 *
 * Copyright (c) 2011 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>
 * CTR part based on code (crypto/ctr.c) by:
 *   (C) Copyright IBM Corp. 2007 - Joy Latten <latten@us.ibm.com>
 *
 * 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 <asm/processor.h>
#include <crypto/blowfish.h>
#include <linux/crypto.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/types.h>
#include <crypto/algapi.h>

/* regular block cipher functions */
asmlinkage void __blowfish_enc_blk(struct bf_ctx *ctx, u8 *dst, const u8 *src,
				   bool xor);
asmlinkage void blowfish_dec_blk(struct bf_ctx *ctx, u8 *dst, const u8 *src);

/* 4-way parallel cipher functions */
asmlinkage void __blowfish_enc_blk_4way(struct bf_ctx *ctx, u8 *dst,
					const u8 *src, bool xor);
asmlinkage void blowfish_dec_blk_4way(struct bf_ctx *ctx, u8 *dst,
				      const u8 *src);

static inline void blowfish_enc_blk(struct bf_ctx *ctx, u8 *dst, const u8 *src)
{
	__blowfish_enc_blk(ctx, dst, src, false);
}

static inline void blowfish_enc_blk_xor(struct bf_ctx *ctx, u8 *dst,
					const u8 *src)
{
	__blowfish_enc_blk(ctx, dst, src, true);
}

static inline void blowfish_enc_blk_4way(struct bf_ctx *ctx, u8 *dst,
					 const u8 *src)
{
	__blowfish_enc_blk_4way(ctx, dst, src, false);
}

static inline void blowfish_enc_blk_xor_4way(struct bf_ctx *ctx, u8 *dst,
				      const u8 *src)
{
	__blowfish_enc_blk_4way(ctx, dst, src, true);
}

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

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

static int ecb_crypt(struct blkcipher_desc *desc, struct blkcipher_walk *walk,
		     void (*fn)(struct bf_ctx *, u8 *, const u8 *),
		     void (*fn_4way)(struct bf_ctx *, u8 *, const u8 *))
{
	struct bf_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
	unsigned int bsize = BF_BLOCK_SIZE;
	unsigned int nbytes;
	int err;

	err = blkcipher_walk_virt(desc, walk);

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

		/* Process four block batch */
		if (nbytes >= bsize * 4) {
			do {
				fn_4way(ctx, wdst, wsrc);

				wsrc += bsize * 4;
				wdst += bsize * 4;
				nbytes -= bsize * 4;
			} while (nbytes >= bsize * 4);

			if (nbytes < bsize)
				goto done;
		}

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

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

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

	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, blowfish_enc_blk, blowfish_enc_blk_4way);
}

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, blowfish_dec_blk, blowfish_dec_blk_4way);
}

static unsigned int __cbc_encrypt(struct blkcipher_desc *desc,
				  struct blkcipher_walk *walk)
{
	struct bf_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
	unsigned int bsize = BF_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;
		blowfish_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 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 bf_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
	unsigned int bsize = BF_BLOCK_SIZE;
	unsigned int nbytes = walk->nbytes;
	u64 *src = (u64 *)walk->src.virt.addr;
	u64 *dst = (u64 *)walk->dst.virt.addr;
	u64 ivs[4 - 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 * 4) {
		do {
			nbytes -= bsize * 4 - bsize;
			src -= 4 - 1;
			dst -= 4 - 1;

			ivs[0] = src[0];
			ivs[1] = src[1];
			ivs[2] = src[2];

			blowfish_dec_blk_4way(ctx, (u8 *)dst, (u8 *)src);

			dst[1] ^= ivs[0];
			dst[2] ^= ivs[1];
			dst[3] ^= ivs[2];

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

			*dst ^= *(src - 1);
			src -= 1;
			dst -= 1;
		} while (nbytes >= bsize * 4);
	}

	/* Handle leftovers */
	for (;;) {
		blowfish_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 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_decrypt(desc, &walk);
		err = blkcipher_walk_done(desc, &walk, nbytes);
	}

	return err;
}

static void ctr_crypt_final(struct bf_ctx *ctx, struct blkcipher_walk *walk)
{
	u8 *ctrblk = walk->iv;
	u8 keystream[BF_BLOCK_SIZE];
	u8 *src = walk->src.virt.addr;
	u8 *dst = walk->dst.virt.addr;
	unsigned int nbytes = walk->nbytes;

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

	crypto_inc(ctrblk, BF_BLOCK_SIZE);
}

static unsigned int __ctr_crypt(struct blkcipher_desc *desc,
				struct blkcipher_walk *walk)
{
	struct bf_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
	unsigned int bsize = BF_BLOCK_SIZE;
	unsigned int nbytes = walk->nbytes;
	u64 *src = (u64 *)walk->src.virt.addr;
	u64 *dst = (u64 *)walk->dst.virt.addr;
	u64 ctrblk = be64_to_cpu(*(__be64 *)walk->iv);
	__be64 ctrblocks[4];

	/* Process four block batch */
	if (nbytes >= bsize * 4) {
		do {
			if (dst != src) {
				dst[0] = src[0];
				dst[1] = src[1];
				dst[2] = src[2];
				dst[3] = src[3];
			}

			/* create ctrblks for parallel encrypt */
			ctrblocks[0] = cpu_to_be64(ctrblk++);
			ctrblocks[1] = cpu_to_be64(ctrblk++);
			ctrblocks[2] = cpu_to_be64(ctrblk++);
			ctrblocks[3] = cpu_to_be64(ctrblk++);

			blowfish_enc_blk_xor_4way(ctx, (u8 *)dst,
						  (u8 *)ctrblocks);

			src += 4;
			dst += 4;
		} while ((nbytes -= bsize * 4) >= bsize * 4);

		if (nbytes < bsize)
			goto done;
	}

	/* Handle leftovers */
	do {
		if (dst != src)
			*dst = *src;

		ctrblocks[0] = cpu_to_be64(ctrblk++);

		blowfish_enc_blk_xor(ctx, (u8 *)dst, (u8 *)ctrblocks);

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

done:
	*(__be64 *)walk->iv = cpu_to_be64(ctrblk);
	return nbytes;
}

static int ctr_crypt(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_block(desc, &walk, BF_BLOCK_SIZE);

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

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

	return err;
}

static struct crypto_alg bf_algs[4] = { {
	.cra_name		= "blowfish",
	.cra_driver_name	= "blowfish-asm",
	.cra_priority		= 200,
	.cra_flags		= CRYPTO_ALG_TYPE_CIPHER,
	.cra_blocksize		= BF_BLOCK_SIZE,
	.cra_ctxsize		= sizeof(struct bf_ctx),
	.cra_alignmask		= 0,
	.cra_module		= THIS_MODULE,
	.cra_u = {
		.cipher = {
			.cia_min_keysize	= BF_MIN_KEY_SIZE,
			.cia_max_keysize	= BF_MAX_KEY_SIZE,
			.cia_setkey		= blowfish_setkey,
			.cia_encrypt		= blowfish_encrypt,
			.cia_decrypt		= blowfish_decrypt,
		}
	}
}, {
	.cra_name		= "ecb(blowfish)",
	.cra_driver_name	= "ecb-blowfish-asm",
	.cra_priority		= 300,
	.cra_flags		= CRYPTO_ALG_TYPE_BLKCIPHER,
	.cra_blocksize		= BF_BLOCK_SIZE,
	.cra_ctxsize		= sizeof(struct bf_ctx),
	.cra_alignmask		= 0,
	.cra_type		= &crypto_blkcipher_type,
	.cra_module		= THIS_MODULE,
	.cra_u = {
		.blkcipher = {
			.min_keysize	= BF_MIN_KEY_SIZE,
			.max_keysize	= BF_MAX_KEY_SIZE,
			.setkey		= blowfish_setkey,
			.encrypt	= ecb_encrypt,
			.decrypt	= ecb_decrypt,
		},
	},
}, {
	.cra_name		= "cbc(blowfish)",
	.cra_driver_name	= "cbc-blowfish-asm",
	.cra_priority		= 300,
	.cra_flags		= CRYPTO_ALG_TYPE_BLKCIPHER,
	.cra_blocksize		= BF_BLOCK_SIZE,
	.cra_ctxsize		= sizeof(struct bf_ctx),
	.cra_alignmask		= 0,
	.cra_type		= &crypto_blkcipher_type,
	.cra_module		= THIS_MODULE,
	.cra_u = {
		.blkcipher = {
			.min_keysize	= BF_MIN_KEY_SIZE,
			.max_keysize	= BF_MAX_KEY_SIZE,
			.ivsize		= BF_BLOCK_SIZE,
			.setkey		= blowfish_setkey,
			.encrypt	= cbc_encrypt,
			.decrypt	= cbc_decrypt,
		},
	},
}, {
	.cra_name		= "ctr(blowfish)",
	.cra_driver_name	= "ctr-blowfish-asm",
	.cra_priority		= 300,
	.cra_flags		= CRYPTO_ALG_TYPE_BLKCIPHER,
	.cra_blocksize		= 1,
	.cra_ctxsize		= sizeof(struct bf_ctx),
	.cra_alignmask		= 0,
	.cra_type		= &crypto_blkcipher_type,
	.cra_module		= THIS_MODULE,
	.cra_u = {
		.blkcipher = {
			.min_keysize	= BF_MIN_KEY_SIZE,
			.max_keysize	= BF_MAX_KEY_SIZE,
			.ivsize		= BF_BLOCK_SIZE,
			.setkey		= blowfish_setkey,
			.encrypt	= ctr_crypt,
			.decrypt	= ctr_crypt,
		},
	},
} };

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, blowfish-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 init(void)
{
	if (!force && is_blacklisted_cpu()) {
		printk(KERN_INFO
			"blowfish-x86_64: performance on this CPU "
			"would be suboptimal: disabling "
			"blowfish-x86_64.\n");
		return -ENODEV;
	}

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

static void __exit fini(void)
{
	crypto_unregister_algs(bf_algs, ARRAY_SIZE(bf_algs));
}

module_init(init);
module_exit(fini);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Blowfish Cipher Algorithm, asm optimized");
MODULE_ALIAS_CRYPTO("blowfish");
MODULE_ALIAS_CRYPTO("blowfish-asm");
Commit	Line	Data
64b94cea JK	1	/*
	2	* Glue Code for assembler optimized version of Blowfish
	3	*
3d387ef0	4	* Copyright (c) 2011 Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
64b94cea	5	*
a071d06e JK	6	* CBC & ECB parts based on code (crypto/cbc.c,ecb.c) by:
	7	* Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
	8	* CTR part based on code (crypto/ctr.c) by:
	9	* (C) Copyright IBM Corp. 2007 - Joy Latten <latten@us.ibm.com>
	10	*
64b94cea JK	11	* This program is free software; you can redistribute it and/or modify
	12	* it under the terms of the GNU General Public License as published by
	13	* the Free Software Foundation; either version 2 of the License, or
	14	* (at your option) any later version.
	15	*
	16	* This program is distributed in the hope that it will be useful,
	17	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	18	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	19	* GNU General Public License for more details.
	20	*
	21	* You should have received a copy of the GNU General Public License
	22	* along with this program; if not, write to the Free Software
	23	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
	24	* USA
	25	*
	26	*/
	27
4c58464b	28	#include <asm/processor.h>
64b94cea JK	29	#include <crypto/blowfish.h>
	30	#include <linux/crypto.h>
	31	#include <linux/init.h>
	32	#include <linux/module.h>
	33	#include <linux/types.h>
	34	#include <crypto/algapi.h>
	35
	36	/* regular block cipher functions */
	37	asmlinkage void __blowfish_enc_blk(struct bf_ctx ctx, u8 dst, const u8 *src,
	38	bool xor);
	39	asmlinkage void blowfish_dec_blk(struct bf_ctx ctx, u8 dst, const u8 *src);
	40
	41	/* 4-way parallel cipher functions */
	42	asmlinkage void __blowfish_enc_blk_4way(struct bf_ctx ctx, u8 dst,
	43	const u8 *src, bool xor);
	44	asmlinkage void blowfish_dec_blk_4way(struct bf_ctx ctx, u8 dst,
	45	const u8 *src);
3d387ef0 JK	46
	47	static inline void blowfish_enc_blk(struct bf_ctx ctx, u8 dst, const u8 *src)
	48	{
	49	__blowfish_enc_blk(ctx, dst, src, false);
	50	}
	51
	52	static inline void blowfish_enc_blk_xor(struct bf_ctx ctx, u8 dst,
	53	const u8 *src)
	54	{
	55	__blowfish_enc_blk(ctx, dst, src, true);
	56	}
	57
	58	static inline void blowfish_enc_blk_4way(struct bf_ctx ctx, u8 dst,
	59	const u8 *src)
	60	{
	61	__blowfish_enc_blk_4way(ctx, dst, src, false);
	62	}
	63
	64	static inline void blowfish_enc_blk_xor_4way(struct bf_ctx ctx, u8 dst,
	65	const u8 *src)
	66	{
	67	__blowfish_enc_blk_4way(ctx, dst, src, true);
	68	}
64b94cea JK	69
	70	static void blowfish_encrypt(struct crypto_tfm tfm, u8 dst, const u8 *src)
	71	{
	72	blowfish_enc_blk(crypto_tfm_ctx(tfm), dst, src);
	73	}
	74
	75	static void blowfish_decrypt(struct crypto_tfm tfm, u8 dst, const u8 *src)
	76	{
	77	blowfish_dec_blk(crypto_tfm_ctx(tfm), dst, src);
	78	}
	79
64b94cea JK	80	static int ecb_crypt(struct blkcipher_desc desc, struct blkcipher_walk walk,
	81	void (fn)(struct bf_ctx , u8 , const u8 ),
	82	void (fn_4way)(struct bf_ctx , u8 , const u8 ))
	83	{
	84	struct bf_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
	85	unsigned int bsize = BF_BLOCK_SIZE;
	86	unsigned int nbytes;
	87	int err;
	88
	89	err = blkcipher_walk_virt(desc, walk);
	90
	91	while ((nbytes = walk->nbytes)) {
	92	u8 *wsrc = walk->src.virt.addr;
	93	u8 *wdst = walk->dst.virt.addr;
	94
	95	/* Process four block batch */
	96	if (nbytes >= bsize * 4) {
	97	do {
	98	fn_4way(ctx, wdst, wsrc);
	99
	100	wsrc += bsize * 4;
	101	wdst += bsize * 4;
	102	nbytes -= bsize * 4;
	103	} while (nbytes >= bsize * 4);
	104
	105	if (nbytes < bsize)
	106	goto done;
	107	}
	108
	109	/* Handle leftovers */
	110	do {
	111	fn(ctx, wdst, wsrc);
	112
	113	wsrc += bsize;
	114	wdst += bsize;
	115	nbytes -= bsize;
	116	} while (nbytes >= bsize);
	117
	118	done:
	119	err = blkcipher_walk_done(desc, walk, nbytes);
	120	}
	121
	122	return err;
	123	}
	124
	125	static int ecb_encrypt(struct blkcipher_desc desc, struct scatterlist dst,
	126	struct scatterlist *src, unsigned int nbytes)
	127	{
	128	struct blkcipher_walk walk;
	129
	130	blkcipher_walk_init(&walk, dst, src, nbytes);
	131	return ecb_crypt(desc, &walk, blowfish_enc_blk, blowfish_enc_blk_4way);
	132	}
	133
	134	static int ecb_decrypt(struct blkcipher_desc desc, struct scatterlist dst,
	135	struct scatterlist *src, unsigned int nbytes)
	136	{
	137	struct blkcipher_walk walk;
	138
	139	blkcipher_walk_init(&walk, dst, src, nbytes);
	140	return ecb_crypt(desc, &walk, blowfish_dec_blk, blowfish_dec_blk_4way);
	141	}
	142
64b94cea JK	143	static unsigned int __cbc_encrypt(struct blkcipher_desc *desc,
	144	struct blkcipher_walk *walk)
	145	{
	146	struct bf_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
	147	unsigned int bsize = BF_BLOCK_SIZE;
	148	unsigned int nbytes = walk->nbytes;
	149	u64 src = (u64 )walk->src.virt.addr;
	150	u64 dst = (u64 )walk->dst.virt.addr;
	151	u64 iv = (u64 )walk->iv;
	152
	153	do {
	154	dst = src ^ *iv;
	155	blowfish_enc_blk(ctx, (u8 )dst, (u8 )dst);
	156	iv = dst;
	157
	158	src += 1;
	159	dst += 1;
	160	nbytes -= bsize;
	161	} while (nbytes >= bsize);
	162
	163	(u64 )walk->iv = *iv;
	164	return nbytes;
	165	}
	166
	167	static int cbc_encrypt(struct blkcipher_desc desc, struct scatterlist dst,
	168	struct scatterlist *src, unsigned int nbytes)
	169	{
	170	struct blkcipher_walk walk;
	171	int err;
	172
	173	blkcipher_walk_init(&walk, dst, src, nbytes);
	174	err = blkcipher_walk_virt(desc, &walk);
	175
	176	while ((nbytes = walk.nbytes)) {
	177	nbytes = __cbc_encrypt(desc, &walk);
	178	err = blkcipher_walk_done(desc, &walk, nbytes);
	179	}
	180
	181	return err;
	182	}
	183
	184	static unsigned int __cbc_decrypt(struct blkcipher_desc *desc,
	185	struct blkcipher_walk *walk)
	186	{
	187	struct bf_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
	188	unsigned int bsize = BF_BLOCK_SIZE;
	189	unsigned int nbytes = walk->nbytes;
	190	u64 src = (u64 )walk->src.virt.addr;
	191	u64 dst = (u64 )walk->dst.virt.addr;
	192	u64 ivs[4 - 1];
	193	u64 last_iv;
	194
	195	/* Start of the last block. */
	196	src += nbytes / bsize - 1;
	197	dst += nbytes / bsize - 1;
	198
	199	last_iv = *src;
	200
	201	/* Process four block batch */
	202	if (nbytes >= bsize * 4) {
	203	do {
	204	nbytes -= bsize * 4 - bsize;
	205	src -= 4 - 1;
	206	dst -= 4 - 1;
207
208	ivs[0] = src[0];
209	ivs[1] = src[1];
210	ivs[2] = src[2];
211
212	blowfish_dec_blk_4way(ctx, (u8 )dst, (u8 )src);
213
214	dst[1] ^= ivs[0];
215	dst[2] ^= ivs[1];
216	dst[3] ^= ivs[2];
217
218	nbytes -= bsize;
219	if (nbytes < bsize)
220	goto done;
221
222	dst ^= (src - 1);
223	src -= 1;
224	dst -= 1;
225	} while (nbytes >= bsize * 4);
64b94cea JK	226	}
	227
	228	/* Handle leftovers */
	229	for (;;) {
	230	blowfish_dec_blk(ctx, (u8 )dst, (u8 )src);
	231
	232	nbytes -= bsize;
	233	if (nbytes < bsize)
	234	break;
	235
	236	dst ^= (src - 1);
	237	src -= 1;
	238	dst -= 1;
	239	}
	240
	241	done:
	242	dst ^= (u64 *)walk->iv;
	243	(u64 )walk->iv = last_iv;
	244
	245	return nbytes;
	246	}
	247
	248	static int cbc_decrypt(struct blkcipher_desc desc, struct scatterlist dst,
	249	struct scatterlist *src, unsigned int nbytes)
	250	{
	251	struct blkcipher_walk walk;
	252	int err;
	253
	254	blkcipher_walk_init(&walk, dst, src, nbytes);
	255	err = blkcipher_walk_virt(desc, &walk);
	256
	257	while ((nbytes = walk.nbytes)) {
	258	nbytes = __cbc_decrypt(desc, &walk);
	259	err = blkcipher_walk_done(desc, &walk, nbytes);
	260	}
	261
	262	return err;
	263	}
	264
64b94cea JK	265	static void ctr_crypt_final(struct bf_ctx ctx, struct blkcipher_walk walk)
	266	{
	267	u8 *ctrblk = walk->iv;
	268	u8 keystream[BF_BLOCK_SIZE];
	269	u8 *src = walk->src.virt.addr;
	270	u8 *dst = walk->dst.virt.addr;
	271	unsigned int nbytes = walk->nbytes;
	272
	273	blowfish_enc_blk(ctx, keystream, ctrblk);
	274	crypto_xor(keystream, src, nbytes);
	275	memcpy(dst, keystream, nbytes);
	276
	277	crypto_inc(ctrblk, BF_BLOCK_SIZE);
	278	}
	279
	280	static unsigned int __ctr_crypt(struct blkcipher_desc *desc,
	281	struct blkcipher_walk *walk)
	282	{
	283	struct bf_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
	284	unsigned int bsize = BF_BLOCK_SIZE;
	285	unsigned int nbytes = walk->nbytes;
	286	u64 src = (u64 )walk->src.virt.addr;
	287	u64 dst = (u64 )walk->dst.virt.addr;
	288	u64 ctrblk = be64_to_cpu((__be64 )walk->iv);
	289	__be64 ctrblocks[4];
	290
	291	/* Process four block batch */
	292	if (nbytes >= bsize * 4) {
	293	do {
	294	if (dst != src) {
	295	dst[0] = src[0];
	296	dst[1] = src[1];
	297	dst[2] = src[2];
	298	dst[3] = src[3];
	299	}
	300
	301	/* create ctrblks for parallel encrypt */
	302	ctrblocks[0] = cpu_to_be64(ctrblk++);
	303	ctrblocks[1] = cpu_to_be64(ctrblk++);
	304	ctrblocks[2] = cpu_to_be64(ctrblk++);
	305	ctrblocks[3] = cpu_to_be64(ctrblk++);
	306
	307	blowfish_enc_blk_xor_4way(ctx, (u8 *)dst,
	308	(u8 *)ctrblocks);
	309
	310	src += 4;
	311	dst += 4;
	312	} while ((nbytes -= bsize * 4) >= bsize * 4);
	313
	314	if (nbytes < bsize)
	315	goto done;
	316	}
	317
	318	/* Handle leftovers */
	319	do {
	320	if (dst != src)
	321	dst = src;
	322
	323	ctrblocks[0] = cpu_to_be64(ctrblk++);
	324
	325	blowfish_enc_blk_xor(ctx, (u8 )dst, (u8 )ctrblocks);
	326
	327	src += 1;
	328	dst += 1;
329	} while ((nbytes -= bsize) >= bsize);
330
331	done:
332	(__be64 )walk->iv = cpu_to_be64(ctrblk);
333	return nbytes;
334	}
335
336	static int ctr_crypt(struct blkcipher_desc desc, struct scatterlist dst,
337	struct scatterlist *src, unsigned int nbytes)
338	{
339	struct blkcipher_walk walk;
340	int err;
341
342	blkcipher_walk_init(&walk, dst, src, nbytes);
343	err = blkcipher_walk_virt_block(desc, &walk, BF_BLOCK_SIZE);
344
345	while ((nbytes = walk.nbytes) >= BF_BLOCK_SIZE) {
346	nbytes = __ctr_crypt(desc, &walk);
347	err = blkcipher_walk_done(desc, &walk, nbytes);
348	}
349
350	if (walk.nbytes) {
351	ctr_crypt_final(crypto_blkcipher_ctx(desc->tfm), &walk);
352	err = blkcipher_walk_done(desc, &walk, 0);
353	}
354
355	return err;
356	}
357
d433208c JK	358	static struct crypto_alg bf_algs[4] = { {
	359	.cra_name = "blowfish",
	360	.cra_driver_name = "blowfish-asm",
	361	.cra_priority = 200,
	362	.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
	363	.cra_blocksize = BF_BLOCK_SIZE,
	364	.cra_ctxsize = sizeof(struct bf_ctx),
919e2c32	365	.cra_alignmask = 0,
d433208c	366	.cra_module = THIS_MODULE,
d433208c JK	367	.cra_u = {
	368	.cipher = {
	369	.cia_min_keysize = BF_MIN_KEY_SIZE,
	370	.cia_max_keysize = BF_MAX_KEY_SIZE,
	371	.cia_setkey = blowfish_setkey,
	372	.cia_encrypt = blowfish_encrypt,
	373	.cia_decrypt = blowfish_decrypt,
	374	}
	375	}
	376	}, {
	377	.cra_name = "ecb(blowfish)",
	378	.cra_driver_name = "ecb-blowfish-asm",
	379	.cra_priority = 300,
	380	.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
	381	.cra_blocksize = BF_BLOCK_SIZE,
	382	.cra_ctxsize = sizeof(struct bf_ctx),
	383	.cra_alignmask = 0,
	384	.cra_type = &crypto_blkcipher_type,
	385	.cra_module = THIS_MODULE,
d433208c JK	386	.cra_u = {
	387	.blkcipher = {
	388	.min_keysize = BF_MIN_KEY_SIZE,
	389	.max_keysize = BF_MAX_KEY_SIZE,
	390	.setkey = blowfish_setkey,
	391	.encrypt = ecb_encrypt,
	392	.decrypt = ecb_decrypt,
	393	},
	394	},
	395	}, {
	396	.cra_name = "cbc(blowfish)",
	397	.cra_driver_name = "cbc-blowfish-asm",
	398	.cra_priority = 300,
	399	.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
	400	.cra_blocksize = BF_BLOCK_SIZE,
	401	.cra_ctxsize = sizeof(struct bf_ctx),
	402	.cra_alignmask = 0,
	403	.cra_type = &crypto_blkcipher_type,
	404	.cra_module = THIS_MODULE,
d433208c JK	405	.cra_u = {
	406	.blkcipher = {
	407	.min_keysize = BF_MIN_KEY_SIZE,
	408	.max_keysize = BF_MAX_KEY_SIZE,
	409	.ivsize = BF_BLOCK_SIZE,
	410	.setkey = blowfish_setkey,
	411	.encrypt = cbc_encrypt,
	412	.decrypt = cbc_decrypt,
	413	},
	414	},
	415	}, {
64b94cea JK	416	.cra_name = "ctr(blowfish)",
	417	.cra_driver_name = "ctr-blowfish-asm",
	418	.cra_priority = 300,
	419	.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
a516ebaf	420	.cra_blocksize = 1,
64b94cea JK	421	.cra_ctxsize = sizeof(struct bf_ctx),
	422	.cra_alignmask = 0,
	423	.cra_type = &crypto_blkcipher_type,
	424	.cra_module = THIS_MODULE,
64b94cea JK	425	.cra_u = {
	426	.blkcipher = {
	427	.min_keysize = BF_MIN_KEY_SIZE,
	428	.max_keysize = BF_MAX_KEY_SIZE,
	429	.ivsize = BF_BLOCK_SIZE,
	430	.setkey = blowfish_setkey,
	431	.encrypt = ctr_crypt,
	432	.decrypt = ctr_crypt,
	433	},
	434	},
d433208c	435	} };
64b94cea	436
4c58464b JK	437	static bool is_blacklisted_cpu(void)
	438	{
	439	if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL)
	440	return false;
	441
	442	if (boot_cpu_data.x86 == 0x0f) {
	443	/*
	444	* On Pentium 4, blowfish-x86_64 is slower than generic C
	445	* implementation because use of 64bit rotates (which are really
	446	* slow on P4). Therefore blacklist P4s.
	447	*/
	448	return true;
	449	}
	450
	451	return false;
	452	}
	453
	454	static int force;
	455	module_param(force, int, 0);
	456	MODULE_PARM_DESC(force, "Force module load, ignore CPU blacklist");
	457
64b94cea JK	458	static int __init init(void)
64b94cea JK	459	{
4c58464b JK	460	if (!force && is_blacklisted_cpu()) {
	461	printk(KERN_INFO
	462	"blowfish-x86_64: performance on this CPU "
	463	"would be suboptimal: disabling "
	464	"blowfish-x86_64.\n");
	465	return -ENODEV;
	466	}
	467
d433208c	468	return crypto_register_algs(bf_algs, ARRAY_SIZE(bf_algs));
64b94cea JK	469	}
	470
	471	static void __exit fini(void)
	472	{
d433208c	473	crypto_unregister_algs(bf_algs, ARRAY_SIZE(bf_algs));
64b94cea JK	474	}
	475
	476	module_init(init);
	477	module_exit(fini);
	478
	479	MODULE_LICENSE("GPL");
	480	MODULE_DESCRIPTION("Blowfish Cipher Algorithm, asm optimized");
5d26a105 KC	481	MODULE_ALIAS_CRYPTO("blowfish");
5d26a105 KC	482	MODULE_ALIAS_CRYPTO("blowfish-asm");