[mirror_ubuntu-bionic-kernel.git] / crypto / pcbc.c

/*
 * PCBC: Propagating Cipher Block Chaining mode
 *
 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 *
 * Derived from cbc.c
 * - Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
 *
 * 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/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);
		memcpy(iv, dst, bsize);
		crypto_xor(iv, 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[bsize];

	do {
		memcpy(tmpbuf, src, bsize);
		crypto_xor(iv, src, bsize);
		crypto_cipher_encrypt_one(tfm, src, iv);
		memcpy(iv, tmpbuf, bsize);
		crypto_xor(iv, 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);
		memcpy(iv, src, bsize);
		crypto_xor(iv, dst, 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[bsize] __aligned(__alignof__(u32));

	do {
		memcpy(tmpbuf, src, bsize);
		crypto_cipher_decrypt_one(tfm, src, src);
		crypto_xor(src, iv, bsize);
		memcpy(iv, tmpbuf, bsize);
		crypto_xor(iv, src, 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);
	crypto_mod_put(alg);
	if (err)
		goto err_free_inst;

	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;

out:
	return err;

err_drop_spawn:
	crypto_drop_spawn(spawn);
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 (dhowells@redhat.com)
	6	*
	7	* Derived from cbc.c
	8	* - Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
	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
043a4400	17	#include <crypto/internal/skcipher.h>
91652be5 DH	18	#include <linux/err.h>
	19	#include <linux/init.h>
	20	#include <linux/kernel.h>
	21	#include <linux/module.h>
91652be5	22	#include <linux/slab.h>
d8c34b94	23	#include <linux/compiler.h>
91652be5 DH	24
	25	struct crypto_pcbc_ctx {
	26	struct crypto_cipher *child;
91652be5 DH	27	};
91652be5 DH	28
043a4400	29	static int crypto_pcbc_setkey(struct crypto_skcipher parent, const u8 key,
91652be5 DH	30	unsigned int keylen)
91652be5 DH	31	{
043a4400	32	struct crypto_pcbc_ctx *ctx = crypto_skcipher_ctx(parent);
91652be5 DH	33	struct crypto_cipher *child = ctx->child;
	34	int err;
	35
	36	crypto_cipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
043a4400 HX	37	crypto_cipher_set_flags(child, crypto_skcipher_get_flags(parent) &
043a4400 HX	38	CRYPTO_TFM_REQ_MASK);
91652be5	39	err = crypto_cipher_setkey(child, key, keylen);
043a4400 HX	40	crypto_skcipher_set_flags(parent, crypto_cipher_get_flags(child) &
043a4400 HX	41	CRYPTO_TFM_RES_MASK);
91652be5 DH	42	return err;
	43	}
	44
043a4400 HX	45	static int crypto_pcbc_encrypt_segment(struct skcipher_request *req,
043a4400 HX	46	struct skcipher_walk *walk,
d0b9007a	47	struct crypto_cipher *tfm)
91652be5	48	{
91652be5 DH	49	int bsize = crypto_cipher_blocksize(tfm);
	50	unsigned int nbytes = walk->nbytes;
	51	u8 *src = walk->src.virt.addr;
	52	u8 *dst = walk->dst.virt.addr;
	53	u8 *iv = walk->iv;
	54
	55	do {
d0b9007a	56	crypto_xor(iv, src, bsize);
043a4400	57	crypto_cipher_encrypt_one(tfm, dst, iv);
91652be5	58	memcpy(iv, dst, bsize);
d0b9007a	59	crypto_xor(iv, 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;
	76	u8 tmpbuf[bsize];
	77
	78	do {
	79	memcpy(tmpbuf, src, bsize);
d0b9007a	80	crypto_xor(iv, src, bsize);
043a4400	81	crypto_cipher_encrypt_one(tfm, src, iv);
d0b9007a HX	82	memcpy(iv, tmpbuf, bsize);
d0b9007a HX	83	crypto_xor(iv, src, bsize);
91652be5 DH	84
	85	src += bsize;
	86	} while ((nbytes -= bsize) >= bsize);
	87
	88	memcpy(walk->iv, iv, bsize);
	89
	90	return nbytes;
	91	}
	92
043a4400	93	static int crypto_pcbc_encrypt(struct skcipher_request *req)
91652be5	94	{
043a4400 HX	95	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
043a4400 HX	96	struct crypto_pcbc_ctx *ctx = crypto_skcipher_ctx(tfm);
91652be5	97	struct crypto_cipher *child = ctx->child;
043a4400 HX	98	struct skcipher_walk walk;
043a4400 HX	99	unsigned int nbytes;
91652be5 DH	100	int err;
91652be5 DH	101
043a4400	102	err = skcipher_walk_virt(&walk, req, false);
91652be5 DH	103
	104	while ((nbytes = walk.nbytes)) {
	105	if (walk.src.virt.addr == walk.dst.virt.addr)
043a4400	106	nbytes = crypto_pcbc_encrypt_inplace(req, &walk,
d0b9007a	107	child);
91652be5	108	else
043a4400	109	nbytes = crypto_pcbc_encrypt_segment(req, &walk,
d0b9007a	110	child);
043a4400	111	err = skcipher_walk_done(&walk, nbytes);
91652be5 DH	112	}
	113
	114	return err;
	115	}
	116
043a4400 HX	117	static int crypto_pcbc_decrypt_segment(struct skcipher_request *req,
043a4400 HX	118	struct skcipher_walk *walk,
d0b9007a	119	struct crypto_cipher *tfm)
91652be5	120	{
91652be5 DH	121	int bsize = crypto_cipher_blocksize(tfm);
	122	unsigned int nbytes = walk->nbytes;
	123	u8 *src = walk->src.virt.addr;
	124	u8 *dst = walk->dst.virt.addr;
	125	u8 *iv = walk->iv;
	126
	127	do {
043a4400	128	crypto_cipher_decrypt_one(tfm, dst, src);
d0b9007a	129	crypto_xor(dst, iv, bsize);
91652be5	130	memcpy(iv, src, bsize);
d0b9007a	131	crypto_xor(iv, dst, bsize);
91652be5 DH	132
	133	src += bsize;
	134	dst += bsize;
	135	} while ((nbytes -= bsize) >= bsize);
	136
	137	memcpy(walk->iv, iv, bsize);
	138
	139	return nbytes;
	140	}
	141
043a4400 HX	142	static int crypto_pcbc_decrypt_inplace(struct skcipher_request *req,
043a4400 HX	143	struct skcipher_walk *walk,
d0b9007a	144	struct crypto_cipher *tfm)
91652be5	145	{
91652be5 DH	146	int bsize = crypto_cipher_blocksize(tfm);
	147	unsigned int nbytes = walk->nbytes;
	148	u8 *src = walk->src.virt.addr;
	149	u8 *iv = walk->iv;
d8c34b94	150	u8 tmpbuf[bsize] __aligned(__alignof__(u32));
91652be5 DH	151
	152	do {
	153	memcpy(tmpbuf, src, bsize);
043a4400	154	crypto_cipher_decrypt_one(tfm, src, src);
d0b9007a	155	crypto_xor(src, iv, bsize);
91652be5	156	memcpy(iv, tmpbuf, bsize);
d0b9007a	157	crypto_xor(iv, src, bsize);
91652be5 DH	158
	159	src += bsize;
	160	} while ((nbytes -= bsize) >= bsize);
	161
	162	memcpy(walk->iv, iv, bsize);
	163
	164	return nbytes;
	165	}
	166
043a4400	167	static int crypto_pcbc_decrypt(struct skcipher_request *req)
91652be5	168	{
043a4400 HX	169	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
043a4400 HX	170	struct crypto_pcbc_ctx *ctx = crypto_skcipher_ctx(tfm);
91652be5	171	struct crypto_cipher *child = ctx->child;
043a4400 HX	172	struct skcipher_walk walk;
043a4400 HX	173	unsigned int nbytes;
91652be5 DH	174	int err;
91652be5 DH	175
043a4400	176	err = skcipher_walk_virt(&walk, req, false);
91652be5 DH	177
	178	while ((nbytes = walk.nbytes)) {
	179	if (walk.src.virt.addr == walk.dst.virt.addr)
043a4400	180	nbytes = crypto_pcbc_decrypt_inplace(req, &walk,
d0b9007a	181	child);
91652be5	182	else
043a4400	183	nbytes = crypto_pcbc_decrypt_segment(req, &walk,
d0b9007a	184	child);
043a4400	185	err = skcipher_walk_done(&walk, nbytes);
91652be5 DH	186	}
	187
	188	return err;
	189	}
	190
043a4400	191	static int crypto_pcbc_init_tfm(struct crypto_skcipher *tfm)
91652be5	192	{
043a4400 HX	193	struct skcipher_instance *inst = skcipher_alg_instance(tfm);
	194	struct crypto_spawn *spawn = skcipher_instance_ctx(inst);
	195	struct crypto_pcbc_ctx *ctx = crypto_skcipher_ctx(tfm);
2e306ee0	196	struct crypto_cipher *cipher;
91652be5	197
2e306ee0 HX	198	cipher = crypto_spawn_cipher(spawn);
	199	if (IS_ERR(cipher))
	200	return PTR_ERR(cipher);
91652be5	201
2e306ee0	202	ctx->child = cipher;
91652be5 DH	203	return 0;
	204	}
	205
043a4400	206	static void crypto_pcbc_exit_tfm(struct crypto_skcipher *tfm)
91652be5	207	{
043a4400 HX	208	struct crypto_pcbc_ctx *ctx = crypto_skcipher_ctx(tfm);
043a4400 HX	209
91652be5 DH	210	crypto_free_cipher(ctx->child);
	211	}
	212
043a4400 HX	213	static void crypto_pcbc_free(struct skcipher_instance *inst)
	214	{
	215	crypto_drop_skcipher(skcipher_instance_ctx(inst));
	216	kfree(inst);
	217	}
	218
	219	static int crypto_pcbc_create(struct crypto_template tmpl, struct rtattr *tb)
91652be5	220	{
043a4400 HX	221	struct skcipher_instance *inst;
	222	struct crypto_attr_type *algt;
	223	struct crypto_spawn *spawn;
91652be5	224	struct crypto_alg *alg;
ebc610e5 HX	225	int err;
ebc610e5 HX	226
043a4400 HX	227	algt = crypto_get_attr_type(tb);
	228	if (IS_ERR(algt))
	229	return PTR_ERR(algt);
	230
	231	if (((algt->type ^ CRYPTO_ALG_TYPE_SKCIPHER) & algt->mask) &
	232	~CRYPTO_ALG_INTERNAL)
	233	return -EINVAL;
91652be5	234
043a4400 HX	235	inst = kzalloc(sizeof(inst) + sizeof(spawn), GFP_KERNEL);
	236	if (!inst)
	237	return -ENOMEM;
	238
	239	alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_CIPHER \|
	240	(algt->type & CRYPTO_ALG_INTERNAL),
	241	CRYPTO_ALG_TYPE_MASK \|
	242	(algt->mask & CRYPTO_ALG_INTERNAL));
	243	err = PTR_ERR(alg);
91652be5	244	if (IS_ERR(alg))
043a4400 HX	245	goto err_free_inst;
	246
	247	spawn = skcipher_instance_ctx(inst);
	248	err = crypto_init_spawn(spawn, alg, skcipher_crypto_instance(inst),
	249	CRYPTO_ALG_TYPE_MASK);
	250	crypto_mod_put(alg);
	251	if (err)
	252	goto err_free_inst;
91652be5	253
043a4400 HX	254	err = crypto_inst_setname(skcipher_crypto_instance(inst), "pcbc", alg);
	255	if (err)
	256	goto err_drop_spawn;
91652be5	257
043a4400 HX	258	inst->alg.base.cra_flags = alg->cra_flags & CRYPTO_ALG_INTERNAL;
	259	inst->alg.base.cra_priority = alg->cra_priority;
	260	inst->alg.base.cra_blocksize = alg->cra_blocksize;
	261	inst->alg.base.cra_alignmask = alg->cra_alignmask;
91652be5	262
043a4400 HX	263	inst->alg.ivsize = alg->cra_blocksize;
	264	inst->alg.min_keysize = alg->cra_cipher.cia_min_keysize;
	265	inst->alg.max_keysize = alg->cra_cipher.cia_max_keysize;
91652be5	266
043a4400	267	inst->alg.base.cra_ctxsize = sizeof(struct crypto_pcbc_ctx);
91652be5	268
043a4400 HX	269	inst->alg.init = crypto_pcbc_init_tfm;
043a4400 HX	270	inst->alg.exit = crypto_pcbc_exit_tfm;
91652be5	271
043a4400 HX	272	inst->alg.setkey = crypto_pcbc_setkey;
	273	inst->alg.encrypt = crypto_pcbc_encrypt;
	274	inst->alg.decrypt = crypto_pcbc_decrypt;
91652be5	275
043a4400	276	inst->free = crypto_pcbc_free;
91652be5	277
043a4400 HX	278	err = skcipher_register_instance(tmpl, inst);
	279	if (err)
	280	goto err_drop_spawn;
	281
	282	out:
	283	return err;
	284
	285	err_drop_spawn:
	286	crypto_drop_spawn(spawn);
	287	err_free_inst:
91652be5	288	kfree(inst);
043a4400	289	goto out;
91652be5 DH	290	}
	291
	292	static struct crypto_template crypto_pcbc_tmpl = {
	293	.name = "pcbc",
043a4400	294	.create = crypto_pcbc_create,
91652be5 DH	295	.module = THIS_MODULE,
	296	};
	297
	298	static int __init crypto_pcbc_module_init(void)
	299	{
	300	return crypto_register_template(&crypto_pcbc_tmpl);
	301	}
	302
	303	static void __exit crypto_pcbc_module_exit(void)
	304	{
	305	crypto_unregister_template(&crypto_pcbc_tmpl);
	306	}
	307
	308	module_init(crypto_pcbc_module_init);
	309	module_exit(crypto_pcbc_module_exit);
	310
	311	MODULE_LICENSE("GPL");
	312	MODULE_DESCRIPTION("PCBC block cipher algorithm");
4943ba16	313	MODULE_ALIAS_CRYPTO("pcbc");