[linux.git] / crypto / pcbc.c

/*
 * PCBC: Propagating Cipher Block Chaining mode
 *
 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells ([email protected])
 *
 * Derived from cbc.c
 * - Copyright (c) 2006 Herbert Xu <[email protected]>
 *
 * 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.
 *
 */

#include <crypto/algapi.h>
#include <crypto/internal/skcipher.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/compiler.h>

struct crypto_pcbc_ctx {
	struct crypto_cipher *child;
};

static int crypto_pcbc_setkey(struct crypto_skcipher *parent, const u8 *key,
			      unsigned int keylen)
{
	struct crypto_pcbc_ctx *ctx = crypto_skcipher_ctx(parent);
	struct crypto_cipher *child = ctx->child;
	int err;

	crypto_cipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
	crypto_cipher_set_flags(child, crypto_skcipher_get_flags(parent) &
				       CRYPTO_TFM_REQ_MASK);
	err = crypto_cipher_setkey(child, key, keylen);
	crypto_skcipher_set_flags(parent, crypto_cipher_get_flags(child) &
					  CRYPTO_TFM_RES_MASK);
	return err;
}

static int crypto_pcbc_encrypt_segment(struct skcipher_request *req,
				       struct skcipher_walk *walk,
				       struct crypto_cipher *tfm)
{
	int bsize = crypto_cipher_blocksize(tfm);
	unsigned int nbytes = walk->nbytes;
	u8 *src = walk->src.virt.addr;
	u8 *dst = walk->dst.virt.addr;
	u8 *iv = walk->iv;

	do {
		crypto_xor(iv, src, bsize);
		crypto_cipher_encrypt_one(tfm, dst, iv);
		crypto_xor_cpy(iv, dst, src, bsize);

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

	return nbytes;
}

static int crypto_pcbc_encrypt_inplace(struct skcipher_request *req,
				       struct skcipher_walk *walk,
				       struct crypto_cipher *tfm)
{
	int bsize = crypto_cipher_blocksize(tfm);
	unsigned int nbytes = walk->nbytes;
	u8 *src = walk->src.virt.addr;
	u8 *iv = walk->iv;
	u8 tmpbuf[MAX_CIPHER_BLOCKSIZE];

	do {
		memcpy(tmpbuf, src, bsize);
		crypto_xor(iv, src, bsize);
		crypto_cipher_encrypt_one(tfm, src, iv);
		crypto_xor_cpy(iv, tmpbuf, src, bsize);

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

	memcpy(walk->iv, iv, bsize);

	return nbytes;
}

static int crypto_pcbc_encrypt(struct skcipher_request *req)
{
	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
	struct crypto_pcbc_ctx *ctx = crypto_skcipher_ctx(tfm);
	struct crypto_cipher *child = ctx->child;
	struct skcipher_walk walk;
	unsigned int nbytes;
	int err;

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

	while ((nbytes = walk.nbytes)) {
		if (walk.src.virt.addr == walk.dst.virt.addr)
			nbytes = crypto_pcbc_encrypt_inplace(req, &walk,
							     child);
		else
			nbytes = crypto_pcbc_encrypt_segment(req, &walk,
							     child);
		err = skcipher_walk_done(&walk, nbytes);
	}

	return err;
}

static int crypto_pcbc_decrypt_segment(struct skcipher_request *req,
				       struct skcipher_walk *walk,
				       struct crypto_cipher *tfm)
{
	int bsize = crypto_cipher_blocksize(tfm);
	unsigned int nbytes = walk->nbytes;
	u8 *src = walk->src.virt.addr;
	u8 *dst = walk->dst.virt.addr;
	u8 *iv = walk->iv;

	do {
		crypto_cipher_decrypt_one(tfm, dst, src);
		crypto_xor(dst, iv, bsize);
		crypto_xor_cpy(iv, dst, src, bsize);

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

	memcpy(walk->iv, iv, bsize);

	return nbytes;
}

static int crypto_pcbc_decrypt_inplace(struct skcipher_request *req,
				       struct skcipher_walk *walk,
				       struct crypto_cipher *tfm)
{
	int bsize = crypto_cipher_blocksize(tfm);
	unsigned int nbytes = walk->nbytes;
	u8 *src = walk->src.virt.addr;
	u8 *iv = walk->iv;
	u8 tmpbuf[MAX_CIPHER_BLOCKSIZE] __aligned(__alignof__(u32));

	do {
		memcpy(tmpbuf, src, bsize);
		crypto_cipher_decrypt_one(tfm, src, src);
		crypto_xor(src, iv, bsize);
		crypto_xor_cpy(iv, src, tmpbuf, bsize);

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

	memcpy(walk->iv, iv, bsize);

	return nbytes;
}

static int crypto_pcbc_decrypt(struct skcipher_request *req)
{
	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
	struct crypto_pcbc_ctx *ctx = crypto_skcipher_ctx(tfm);
	struct crypto_cipher *child = ctx->child;
	struct skcipher_walk walk;
	unsigned int nbytes;
	int err;

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

	while ((nbytes = walk.nbytes)) {
		if (walk.src.virt.addr == walk.dst.virt.addr)
			nbytes = crypto_pcbc_decrypt_inplace(req, &walk,
							     child);
		else
			nbytes = crypto_pcbc_decrypt_segment(req, &walk,
							     child);
		err = skcipher_walk_done(&walk, nbytes);
	}

	return err;
}

static int crypto_pcbc_init_tfm(struct crypto_skcipher *tfm)
{
	struct skcipher_instance *inst = skcipher_alg_instance(tfm);
	struct crypto_spawn *spawn = skcipher_instance_ctx(inst);
	struct crypto_pcbc_ctx *ctx = crypto_skcipher_ctx(tfm);
	struct crypto_cipher *cipher;

	cipher = crypto_spawn_cipher(spawn);
	if (IS_ERR(cipher))
		return PTR_ERR(cipher);

	ctx->child = cipher;
	return 0;
}

static void crypto_pcbc_exit_tfm(struct crypto_skcipher *tfm)
{
	struct crypto_pcbc_ctx *ctx = crypto_skcipher_ctx(tfm);

	crypto_free_cipher(ctx->child);
}

static void crypto_pcbc_free(struct skcipher_instance *inst)
{
	crypto_drop_skcipher(skcipher_instance_ctx(inst));
	kfree(inst);
}

static int crypto_pcbc_create(struct crypto_template *tmpl, struct rtattr **tb)
{
	struct skcipher_instance *inst;
	struct crypto_attr_type *algt;
	struct crypto_spawn *spawn;
	struct crypto_alg *alg;
	int err;

	algt = crypto_get_attr_type(tb);
	if (IS_ERR(algt))
		return PTR_ERR(algt);

	if (((algt->type ^ CRYPTO_ALG_TYPE_SKCIPHER) & algt->mask) &
	    ~CRYPTO_ALG_INTERNAL)
		return -EINVAL;

	inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
	if (!inst)
		return -ENOMEM;

	alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_CIPHER |
				      (algt->type & CRYPTO_ALG_INTERNAL),
				  CRYPTO_ALG_TYPE_MASK |
				  (algt->mask & CRYPTO_ALG_INTERNAL));
	err = PTR_ERR(alg);
	if (IS_ERR(alg))
		goto err_free_inst;

	spawn = skcipher_instance_ctx(inst);
	err = crypto_init_spawn(spawn, alg, skcipher_crypto_instance(inst),
				CRYPTO_ALG_TYPE_MASK);
	if (err)
		goto err_put_alg;

	err = crypto_inst_setname(skcipher_crypto_instance(inst), "pcbc", alg);
	if (err)
		goto err_drop_spawn;

	inst->alg.base.cra_flags = alg->cra_flags & CRYPTO_ALG_INTERNAL;
	inst->alg.base.cra_priority = alg->cra_priority;
	inst->alg.base.cra_blocksize = alg->cra_blocksize;
	inst->alg.base.cra_alignmask = alg->cra_alignmask;

	inst->alg.ivsize = alg->cra_blocksize;
	inst->alg.min_keysize = alg->cra_cipher.cia_min_keysize;
	inst->alg.max_keysize = alg->cra_cipher.cia_max_keysize;

	inst->alg.base.cra_ctxsize = sizeof(struct crypto_pcbc_ctx);

	inst->alg.init = crypto_pcbc_init_tfm;
	inst->alg.exit = crypto_pcbc_exit_tfm;

	inst->alg.setkey = crypto_pcbc_setkey;
	inst->alg.encrypt = crypto_pcbc_encrypt;
	inst->alg.decrypt = crypto_pcbc_decrypt;

	inst->free = crypto_pcbc_free;

	err = skcipher_register_instance(tmpl, inst);
	if (err)
		goto err_drop_spawn;
	crypto_mod_put(alg);

out:
	return err;

err_drop_spawn:
	crypto_drop_spawn(spawn);
err_put_alg:
	crypto_mod_put(alg);
err_free_inst:
	kfree(inst);
	goto out;
}

static struct crypto_template crypto_pcbc_tmpl = {
	.name = "pcbc",
	.create = crypto_pcbc_create,
	.module = THIS_MODULE,
};

static int __init crypto_pcbc_module_init(void)
{
	return crypto_register_template(&crypto_pcbc_tmpl);
}

static void __exit crypto_pcbc_module_exit(void)
{
	crypto_unregister_template(&crypto_pcbc_tmpl);
}

module_init(crypto_pcbc_module_init);
module_exit(crypto_pcbc_module_exit);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("PCBC block cipher algorithm");
MODULE_ALIAS_CRYPTO("pcbc");
Commit	Line	Data
91652be5 DH	1	/*
	2	* PCBC: Propagating Cipher Block Chaining mode
	3	*
	4	* Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
	5	* Written by David Howells ([email protected])
	6	*
	7	* Derived from cbc.c
	8	* - Copyright (c) 2006 Herbert Xu <[email protected]>
	9	*
	10	* This program is free software; you can redistribute it and/or modify it
	11	* under the terms of the GNU General Public License as published by the Free
	12	* Software Foundation; either version 2 of the License, or (at your option)
	13	* any later version.
	14	*
	15	*/
	16
6650c4de	17	#include <crypto/algapi.h>
043a4400	18	#include <crypto/internal/skcipher.h>
91652be5 DH	19	#include <linux/err.h>
	20	#include <linux/init.h>
	21	#include <linux/kernel.h>
	22	#include <linux/module.h>
91652be5	23	#include <linux/slab.h>
d8c34b94	24	#include <linux/compiler.h>
91652be5 DH	25
	26	struct crypto_pcbc_ctx {
	27	struct crypto_cipher *child;
91652be5 DH	28	};
91652be5 DH	29
043a4400	30	static int crypto_pcbc_setkey(struct crypto_skcipher parent, const u8 key,
91652be5 DH	31	unsigned int keylen)
91652be5 DH	32	{
043a4400	33	struct crypto_pcbc_ctx *ctx = crypto_skcipher_ctx(parent);
91652be5 DH	34	struct crypto_cipher *child = ctx->child;
	35	int err;
	36
	37	crypto_cipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
043a4400 HX	38	crypto_cipher_set_flags(child, crypto_skcipher_get_flags(parent) &
043a4400 HX	39	CRYPTO_TFM_REQ_MASK);
91652be5	40	err = crypto_cipher_setkey(child, key, keylen);
043a4400 HX	41	crypto_skcipher_set_flags(parent, crypto_cipher_get_flags(child) &
043a4400 HX	42	CRYPTO_TFM_RES_MASK);
91652be5 DH	43	return err;
	44	}
	45
043a4400 HX	46	static int crypto_pcbc_encrypt_segment(struct skcipher_request *req,
043a4400 HX	47	struct skcipher_walk *walk,
d0b9007a	48	struct crypto_cipher *tfm)
91652be5	49	{
91652be5 DH	50	int bsize = crypto_cipher_blocksize(tfm);
	51	unsigned int nbytes = walk->nbytes;
	52	u8 *src = walk->src.virt.addr;
	53	u8 *dst = walk->dst.virt.addr;
	54	u8 *iv = walk->iv;
	55
	56	do {
d0b9007a	57	crypto_xor(iv, src, bsize);
043a4400	58	crypto_cipher_encrypt_one(tfm, dst, iv);
45fe93df	59	crypto_xor_cpy(iv, dst, src, bsize);
91652be5 DH	60
	61	src += bsize;
	62	dst += bsize;
	63	} while ((nbytes -= bsize) >= bsize);
	64
	65	return nbytes;
	66	}
	67
043a4400 HX	68	static int crypto_pcbc_encrypt_inplace(struct skcipher_request *req,
043a4400 HX	69	struct skcipher_walk *walk,
d0b9007a	70	struct crypto_cipher *tfm)
91652be5	71	{
91652be5 DH	72	int bsize = crypto_cipher_blocksize(tfm);
	73	unsigned int nbytes = walk->nbytes;
	74	u8 *src = walk->src.virt.addr;
	75	u8 *iv = walk->iv;
6650c4de	76	u8 tmpbuf[MAX_CIPHER_BLOCKSIZE];
91652be5 DH	77
	78	do {
	79	memcpy(tmpbuf, src, bsize);
d0b9007a	80	crypto_xor(iv, src, bsize);
043a4400	81	crypto_cipher_encrypt_one(tfm, src, iv);
45fe93df	82	crypto_xor_cpy(iv, tmpbuf, src, bsize);
91652be5 DH	83
	84	src += bsize;
	85	} while ((nbytes -= bsize) >= bsize);
	86
	87	memcpy(walk->iv, iv, bsize);
	88
	89	return nbytes;
	90	}
	91
043a4400	92	static int crypto_pcbc_encrypt(struct skcipher_request *req)
91652be5	93	{
043a4400 HX	94	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
043a4400 HX	95	struct crypto_pcbc_ctx *ctx = crypto_skcipher_ctx(tfm);
91652be5	96	struct crypto_cipher *child = ctx->child;
043a4400 HX	97	struct skcipher_walk walk;
043a4400 HX	98	unsigned int nbytes;
91652be5 DH	99	int err;
91652be5 DH	100
043a4400	101	err = skcipher_walk_virt(&walk, req, false);
91652be5 DH	102
	103	while ((nbytes = walk.nbytes)) {
	104	if (walk.src.virt.addr == walk.dst.virt.addr)
043a4400	105	nbytes = crypto_pcbc_encrypt_inplace(req, &walk,
d0b9007a	106	child);
91652be5	107	else
043a4400	108	nbytes = crypto_pcbc_encrypt_segment(req, &walk,
d0b9007a	109	child);
043a4400	110	err = skcipher_walk_done(&walk, nbytes);
91652be5 DH	111	}
	112
	113	return err;
	114	}
	115
043a4400 HX	116	static int crypto_pcbc_decrypt_segment(struct skcipher_request *req,
043a4400 HX	117	struct skcipher_walk *walk,
d0b9007a	118	struct crypto_cipher *tfm)
91652be5	119	{
91652be5 DH	120	int bsize = crypto_cipher_blocksize(tfm);
	121	unsigned int nbytes = walk->nbytes;
	122	u8 *src = walk->src.virt.addr;
	123	u8 *dst = walk->dst.virt.addr;
	124	u8 *iv = walk->iv;
	125
	126	do {
043a4400	127	crypto_cipher_decrypt_one(tfm, dst, src);
d0b9007a	128	crypto_xor(dst, iv, bsize);
45fe93df	129	crypto_xor_cpy(iv, dst, src, bsize);
91652be5 DH	130
	131	src += bsize;
	132	dst += bsize;
	133	} while ((nbytes -= bsize) >= bsize);
	134
	135	memcpy(walk->iv, iv, bsize);
	136
	137	return nbytes;
	138	}
	139
043a4400 HX	140	static int crypto_pcbc_decrypt_inplace(struct skcipher_request *req,
043a4400 HX	141	struct skcipher_walk *walk,
d0b9007a	142	struct crypto_cipher *tfm)
91652be5	143	{
91652be5 DH	144	int bsize = crypto_cipher_blocksize(tfm);
	145	unsigned int nbytes = walk->nbytes;
	146	u8 *src = walk->src.virt.addr;
	147	u8 *iv = walk->iv;
6650c4de	148	u8 tmpbuf[MAX_CIPHER_BLOCKSIZE] __aligned(__alignof__(u32));
91652be5 DH	149
	150	do {
	151	memcpy(tmpbuf, src, bsize);
043a4400	152	crypto_cipher_decrypt_one(tfm, src, src);
d0b9007a	153	crypto_xor(src, iv, bsize);
45fe93df	154	crypto_xor_cpy(iv, src, tmpbuf, bsize);
91652be5 DH	155
	156	src += bsize;
	157	} while ((nbytes -= bsize) >= bsize);
	158
	159	memcpy(walk->iv, iv, bsize);
	160
	161	return nbytes;
	162	}
	163
043a4400	164	static int crypto_pcbc_decrypt(struct skcipher_request *req)
91652be5	165	{
043a4400 HX	166	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
043a4400 HX	167	struct crypto_pcbc_ctx *ctx = crypto_skcipher_ctx(tfm);
91652be5	168	struct crypto_cipher *child = ctx->child;
043a4400 HX	169	struct skcipher_walk walk;
043a4400 HX	170	unsigned int nbytes;
91652be5 DH	171	int err;
91652be5 DH	172
043a4400	173	err = skcipher_walk_virt(&walk, req, false);
91652be5 DH	174
	175	while ((nbytes = walk.nbytes)) {
	176	if (walk.src.virt.addr == walk.dst.virt.addr)
043a4400	177	nbytes = crypto_pcbc_decrypt_inplace(req, &walk,
d0b9007a	178	child);
91652be5	179	else
043a4400	180	nbytes = crypto_pcbc_decrypt_segment(req, &walk,
d0b9007a	181	child);
043a4400	182	err = skcipher_walk_done(&walk, nbytes);
91652be5 DH	183	}
	184
	185	return err;
	186	}
	187
043a4400	188	static int crypto_pcbc_init_tfm(struct crypto_skcipher *tfm)
91652be5	189	{
043a4400 HX	190	struct skcipher_instance *inst = skcipher_alg_instance(tfm);
	191	struct crypto_spawn *spawn = skcipher_instance_ctx(inst);
	192	struct crypto_pcbc_ctx *ctx = crypto_skcipher_ctx(tfm);
2e306ee0	193	struct crypto_cipher *cipher;
91652be5	194
2e306ee0 HX	195	cipher = crypto_spawn_cipher(spawn);
	196	if (IS_ERR(cipher))
	197	return PTR_ERR(cipher);
91652be5	198
2e306ee0	199	ctx->child = cipher;
91652be5 DH	200	return 0;
	201	}
	202
043a4400	203	static void crypto_pcbc_exit_tfm(struct crypto_skcipher *tfm)
91652be5	204	{
043a4400 HX	205	struct crypto_pcbc_ctx *ctx = crypto_skcipher_ctx(tfm);
043a4400 HX	206
91652be5 DH	207	crypto_free_cipher(ctx->child);
	208	}
	209
043a4400 HX	210	static void crypto_pcbc_free(struct skcipher_instance *inst)
	211	{
	212	crypto_drop_skcipher(skcipher_instance_ctx(inst));
	213	kfree(inst);
	214	}
	215
	216	static int crypto_pcbc_create(struct crypto_template tmpl, struct rtattr *tb)
91652be5	217	{
043a4400 HX	218	struct skcipher_instance *inst;
	219	struct crypto_attr_type *algt;
	220	struct crypto_spawn *spawn;
91652be5	221	struct crypto_alg *alg;
ebc610e5 HX	222	int err;
ebc610e5 HX	223
043a4400 HX	224	algt = crypto_get_attr_type(tb);
	225	if (IS_ERR(algt))
	226	return PTR_ERR(algt);
	227
	228	if (((algt->type ^ CRYPTO_ALG_TYPE_SKCIPHER) & algt->mask) &
	229	~CRYPTO_ALG_INTERNAL)
	230	return -EINVAL;
91652be5	231
043a4400 HX	232	inst = kzalloc(sizeof(inst) + sizeof(spawn), GFP_KERNEL);
	233	if (!inst)
	234	return -ENOMEM;
	235
	236	alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_CIPHER \|
	237	(algt->type & CRYPTO_ALG_INTERNAL),
	238	CRYPTO_ALG_TYPE_MASK \|
	239	(algt->mask & CRYPTO_ALG_INTERNAL));
	240	err = PTR_ERR(alg);
91652be5	241	if (IS_ERR(alg))
043a4400 HX	242	goto err_free_inst;
	243
	244	spawn = skcipher_instance_ctx(inst);
	245	err = crypto_init_spawn(spawn, alg, skcipher_crypto_instance(inst),
	246	CRYPTO_ALG_TYPE_MASK);
043a4400	247	if (err)
e5bde04c	248	goto err_put_alg;
91652be5	249
043a4400 HX	250	err = crypto_inst_setname(skcipher_crypto_instance(inst), "pcbc", alg);
	251	if (err)
	252	goto err_drop_spawn;
91652be5	253
043a4400 HX	254	inst->alg.base.cra_flags = alg->cra_flags & CRYPTO_ALG_INTERNAL;
	255	inst->alg.base.cra_priority = alg->cra_priority;
	256	inst->alg.base.cra_blocksize = alg->cra_blocksize;
	257	inst->alg.base.cra_alignmask = alg->cra_alignmask;
91652be5	258
043a4400 HX	259	inst->alg.ivsize = alg->cra_blocksize;
	260	inst->alg.min_keysize = alg->cra_cipher.cia_min_keysize;
	261	inst->alg.max_keysize = alg->cra_cipher.cia_max_keysize;
91652be5	262
043a4400	263	inst->alg.base.cra_ctxsize = sizeof(struct crypto_pcbc_ctx);
91652be5	264
043a4400 HX	265	inst->alg.init = crypto_pcbc_init_tfm;
043a4400 HX	266	inst->alg.exit = crypto_pcbc_exit_tfm;
91652be5	267
043a4400 HX	268	inst->alg.setkey = crypto_pcbc_setkey;
	269	inst->alg.encrypt = crypto_pcbc_encrypt;
	270	inst->alg.decrypt = crypto_pcbc_decrypt;
91652be5	271
043a4400	272	inst->free = crypto_pcbc_free;
91652be5	273
043a4400 HX	274	err = skcipher_register_instance(tmpl, inst);
	275	if (err)
	276	goto err_drop_spawn;
e5bde04c	277	crypto_mod_put(alg);
043a4400 HX	278
	279	out:
	280	return err;
	281
	282	err_drop_spawn:
	283	crypto_drop_spawn(spawn);
e5bde04c PB	284	err_put_alg:
e5bde04c PB	285	crypto_mod_put(alg);
043a4400	286	err_free_inst:
91652be5	287	kfree(inst);
043a4400	288	goto out;
91652be5 DH	289	}
	290
	291	static struct crypto_template crypto_pcbc_tmpl = {
	292	.name = "pcbc",
043a4400	293	.create = crypto_pcbc_create,
91652be5 DH	294	.module = THIS_MODULE,
	295	};
	296
	297	static int __init crypto_pcbc_module_init(void)
	298	{
	299	return crypto_register_template(&crypto_pcbc_tmpl);
	300	}
	301
	302	static void __exit crypto_pcbc_module_exit(void)
	303	{
	304	crypto_unregister_template(&crypto_pcbc_tmpl);
	305	}
	306
	307	module_init(crypto_pcbc_module_init);
	308	module_exit(crypto_pcbc_module_exit);
	309
	310	MODULE_LICENSE("GPL");
	311	MODULE_DESCRIPTION("PCBC block cipher algorithm");
4943ba16	312	MODULE_ALIAS_CRYPTO("pcbc");