[GitHub/mt8127/android_kernel_alcatel_ttab.git] / crypto / chainiv.c

/*
 * chainiv: Chain IV Generator
 *
 * Generate IVs simply be using the last block of the previous encryption.
 * This is mainly useful for CBC with a synchronous algorithm.
 *
 * Copyright (c) 2007 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 <crypto/rng.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/string.h>
#include <linux/workqueue.h>

enum {
	CHAINIV_STATE_INUSE = 0,
};

struct chainiv_ctx {
	spinlock_t lock;
	char iv[];
};

struct async_chainiv_ctx {
	unsigned long state;

	spinlock_t lock;
	int err;

	struct crypto_queue queue;
	struct work_struct postponed;

	char iv[];
};

static int chainiv_givencrypt(struct skcipher_givcrypt_request *req)
{
	struct crypto_ablkcipher *geniv = skcipher_givcrypt_reqtfm(req);
	struct chainiv_ctx *ctx = crypto_ablkcipher_ctx(geniv);
	struct ablkcipher_request *subreq = skcipher_givcrypt_reqctx(req);
	unsigned int ivsize;
	int err;

	ablkcipher_request_set_tfm(subreq, skcipher_geniv_cipher(geniv));
	ablkcipher_request_set_callback(subreq, req->creq.base.flags &
						~CRYPTO_TFM_REQ_MAY_SLEEP,
					req->creq.base.complete,
					req->creq.base.data);
	ablkcipher_request_set_crypt(subreq, req->creq.src, req->creq.dst,
				     req->creq.nbytes, req->creq.info);

	spin_lock_bh(&ctx->lock);

	ivsize = crypto_ablkcipher_ivsize(geniv);

	memcpy(req->giv, ctx->iv, ivsize);
	memcpy(subreq->info, ctx->iv, ivsize);

	err = crypto_ablkcipher_encrypt(subreq);
	if (err)
		goto unlock;

	memcpy(ctx->iv, subreq->info, ivsize);

unlock:
	spin_unlock_bh(&ctx->lock);

	return err;
}

static int chainiv_givencrypt_first(struct skcipher_givcrypt_request *req)
{
	struct crypto_ablkcipher *geniv = skcipher_givcrypt_reqtfm(req);
	struct chainiv_ctx *ctx = crypto_ablkcipher_ctx(geniv);
	int err = 0;

	spin_lock_bh(&ctx->lock);
	if (crypto_ablkcipher_crt(geniv)->givencrypt !=
	    chainiv_givencrypt_first)
		goto unlock;

	crypto_ablkcipher_crt(geniv)->givencrypt = chainiv_givencrypt;
	err = crypto_rng_get_bytes(crypto_default_rng, ctx->iv,
				   crypto_ablkcipher_ivsize(geniv));

unlock:
	spin_unlock_bh(&ctx->lock);

	if (err)
		return err;

	return chainiv_givencrypt(req);
}

static int chainiv_init_common(struct crypto_tfm *tfm)
{
	tfm->crt_ablkcipher.reqsize = sizeof(struct ablkcipher_request);

	return skcipher_geniv_init(tfm);
}

static int chainiv_init(struct crypto_tfm *tfm)
{
	struct chainiv_ctx *ctx = crypto_tfm_ctx(tfm);

	spin_lock_init(&ctx->lock);

	return chainiv_init_common(tfm);
}

static int async_chainiv_schedule_work(struct async_chainiv_ctx *ctx)
{
	int queued;
	int err = ctx->err;

	if (!ctx->queue.qlen) {
		smp_mb__before_clear_bit();
		clear_bit(CHAINIV_STATE_INUSE, &ctx->state);

		if (!ctx->queue.qlen ||
		    test_and_set_bit(CHAINIV_STATE_INUSE, &ctx->state))
			goto out;
	}

	queued = schedule_work(&ctx->postponed);
	BUG_ON(!queued);

out:
	return err;
}

static int async_chainiv_postpone_request(struct skcipher_givcrypt_request *req)
{
	struct crypto_ablkcipher *geniv = skcipher_givcrypt_reqtfm(req);
	struct async_chainiv_ctx *ctx = crypto_ablkcipher_ctx(geniv);
	int err;

	spin_lock_bh(&ctx->lock);
	err = skcipher_enqueue_givcrypt(&ctx->queue, req);
	spin_unlock_bh(&ctx->lock);

	if (test_and_set_bit(CHAINIV_STATE_INUSE, &ctx->state))
		return err;

	ctx->err = err;
	return async_chainiv_schedule_work(ctx);
}

static int async_chainiv_givencrypt_tail(struct skcipher_givcrypt_request *req)
{
	struct crypto_ablkcipher *geniv = skcipher_givcrypt_reqtfm(req);
	struct async_chainiv_ctx *ctx = crypto_ablkcipher_ctx(geniv);
	struct ablkcipher_request *subreq = skcipher_givcrypt_reqctx(req);
	unsigned int ivsize = crypto_ablkcipher_ivsize(geniv);

	memcpy(req->giv, ctx->iv, ivsize);
	memcpy(subreq->info, ctx->iv, ivsize);

	ctx->err = crypto_ablkcipher_encrypt(subreq);
	if (ctx->err)
		goto out;

	memcpy(ctx->iv, subreq->info, ivsize);

out:
	return async_chainiv_schedule_work(ctx);
}

static int async_chainiv_givencrypt(struct skcipher_givcrypt_request *req)
{
	struct crypto_ablkcipher *geniv = skcipher_givcrypt_reqtfm(req);
	struct async_chainiv_ctx *ctx = crypto_ablkcipher_ctx(geniv);
	struct ablkcipher_request *subreq = skcipher_givcrypt_reqctx(req);

	ablkcipher_request_set_tfm(subreq, skcipher_geniv_cipher(geniv));
	ablkcipher_request_set_callback(subreq, req->creq.base.flags,
					req->creq.base.complete,
					req->creq.base.data);
	ablkcipher_request_set_crypt(subreq, req->creq.src, req->creq.dst,
				     req->creq.nbytes, req->creq.info);

	if (test_and_set_bit(CHAINIV_STATE_INUSE, &ctx->state))
		goto postpone;

	if (ctx->queue.qlen) {
		clear_bit(CHAINIV_STATE_INUSE, &ctx->state);
		goto postpone;
	}

	return async_chainiv_givencrypt_tail(req);

postpone:
	return async_chainiv_postpone_request(req);
}

static int async_chainiv_givencrypt_first(struct skcipher_givcrypt_request *req)
{
	struct crypto_ablkcipher *geniv = skcipher_givcrypt_reqtfm(req);
	struct async_chainiv_ctx *ctx = crypto_ablkcipher_ctx(geniv);
	int err = 0;

	if (test_and_set_bit(CHAINIV_STATE_INUSE, &ctx->state))
		goto out;

	if (crypto_ablkcipher_crt(geniv)->givencrypt !=
	    async_chainiv_givencrypt_first)
		goto unlock;

	crypto_ablkcipher_crt(geniv)->givencrypt = async_chainiv_givencrypt;
	err = crypto_rng_get_bytes(crypto_default_rng, ctx->iv,
				   crypto_ablkcipher_ivsize(geniv));

unlock:
	clear_bit(CHAINIV_STATE_INUSE, &ctx->state);

	if (err)
		return err;

out:
	return async_chainiv_givencrypt(req);
}

static void async_chainiv_do_postponed(struct work_struct *work)
{
	struct async_chainiv_ctx *ctx = container_of(work,
						     struct async_chainiv_ctx,
						     postponed);
	struct skcipher_givcrypt_request *req;
	struct ablkcipher_request *subreq;
	int err;

	/* Only handle one request at a time to avoid hogging keventd. */
	spin_lock_bh(&ctx->lock);
	req = skcipher_dequeue_givcrypt(&ctx->queue);
	spin_unlock_bh(&ctx->lock);

	if (!req) {
		async_chainiv_schedule_work(ctx);
		return;
	}

	subreq = skcipher_givcrypt_reqctx(req);
	subreq->base.flags |= CRYPTO_TFM_REQ_MAY_SLEEP;

	err = async_chainiv_givencrypt_tail(req);

	local_bh_disable();
	skcipher_givcrypt_complete(req, err);
	local_bh_enable();
}

static int async_chainiv_init(struct crypto_tfm *tfm)
{
	struct async_chainiv_ctx *ctx = crypto_tfm_ctx(tfm);

	spin_lock_init(&ctx->lock);

	crypto_init_queue(&ctx->queue, 100);
	INIT_WORK(&ctx->postponed, async_chainiv_do_postponed);

	return chainiv_init_common(tfm);
}

static void async_chainiv_exit(struct crypto_tfm *tfm)
{
	struct async_chainiv_ctx *ctx = crypto_tfm_ctx(tfm);

	BUG_ON(test_bit(CHAINIV_STATE_INUSE, &ctx->state) || ctx->queue.qlen);

	skcipher_geniv_exit(tfm);
}

static struct crypto_template chainiv_tmpl;

static struct crypto_instance *chainiv_alloc(struct rtattr **tb)
{
	struct crypto_attr_type *algt;
	struct crypto_instance *inst;
	int err;

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

	err = crypto_get_default_rng();
	if (err)
		return ERR_PTR(err);

	inst = skcipher_geniv_alloc(&chainiv_tmpl, tb, 0, 0);
	if (IS_ERR(inst))
		goto put_rng;

	inst->alg.cra_ablkcipher.givencrypt = chainiv_givencrypt_first;

	inst->alg.cra_init = chainiv_init;
	inst->alg.cra_exit = skcipher_geniv_exit;

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

	if (!crypto_requires_sync(algt->type, algt->mask)) {
		inst->alg.cra_flags |= CRYPTO_ALG_ASYNC;

		inst->alg.cra_ablkcipher.givencrypt =
			async_chainiv_givencrypt_first;

		inst->alg.cra_init = async_chainiv_init;
		inst->alg.cra_exit = async_chainiv_exit;

		inst->alg.cra_ctxsize = sizeof(struct async_chainiv_ctx);
	}

	inst->alg.cra_ctxsize += inst->alg.cra_ablkcipher.ivsize;

out:
	return inst;

put_rng:
	crypto_put_default_rng();
	goto out;
}

static void chainiv_free(struct crypto_instance *inst)
{
	skcipher_geniv_free(inst);
	crypto_put_default_rng();
}

static struct crypto_template chainiv_tmpl = {
	.name = "chainiv",
	.alloc = chainiv_alloc,
	.free = chainiv_free,
	.module = THIS_MODULE,
};

static int __init chainiv_module_init(void)
{
	return crypto_register_template(&chainiv_tmpl);
}

static void chainiv_module_exit(void)
{
	crypto_unregister_template(&chainiv_tmpl);
}

module_init(chainiv_module_init);
module_exit(chainiv_module_exit);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Chain IV Generator");
Commit	Line	Data
7f470739 HX	1	/*
	2	* chainiv: Chain IV Generator
	3	*
	4	* Generate IVs simply be using the last block of the previous encryption.
	5	* This is mainly useful for CBC with a synchronous algorithm.
	6	*
	7	* Copyright (c) 2007 Herbert Xu <herbert@gondor.apana.org.au>
	8	*
	9	* This program is free software; you can redistribute it and/or modify it
	10	* under the terms of the GNU General Public License as published by the Free
	11	* Software Foundation; either version 2 of the License, or (at your option)
	12	* any later version.
	13	*
	14	*/
	15
	16	#include <crypto/internal/skcipher.h>
a0f000ec	17	#include <crypto/rng.h>
7f470739 HX	18	#include <linux/err.h>
7f470739 HX	19	#include <linux/init.h>
e7cd2514	20	#include <linux/kernel.h>
7f470739	21	#include <linux/module.h>
7f470739 HX	22	#include <linux/spinlock.h>
7f470739 HX	23	#include <linux/string.h>
e7cd2514 HX	24	#include <linux/workqueue.h>
	25
	26	enum {
	27	CHAINIV_STATE_INUSE = 0,
	28	};
7f470739 HX	29
	30	struct chainiv_ctx {
	31	spinlock_t lock;
	32	char iv[];
	33	};
	34
e7cd2514 HX	35	struct async_chainiv_ctx {
	36	unsigned long state;
	37
	38	spinlock_t lock;
	39	int err;
	40
	41	struct crypto_queue queue;
	42	struct work_struct postponed;
	43
	44	char iv[];
	45	};
	46
7f470739 HX	47	static int chainiv_givencrypt(struct skcipher_givcrypt_request *req)
	48	{
	49	struct crypto_ablkcipher *geniv = skcipher_givcrypt_reqtfm(req);
	50	struct chainiv_ctx *ctx = crypto_ablkcipher_ctx(geniv);
	51	struct ablkcipher_request *subreq = skcipher_givcrypt_reqctx(req);
	52	unsigned int ivsize;
	53	int err;
	54
	55	ablkcipher_request_set_tfm(subreq, skcipher_geniv_cipher(geniv));
	56	ablkcipher_request_set_callback(subreq, req->creq.base.flags &
	57	~CRYPTO_TFM_REQ_MAY_SLEEP,
	58	req->creq.base.complete,
	59	req->creq.base.data);
	60	ablkcipher_request_set_crypt(subreq, req->creq.src, req->creq.dst,
	61	req->creq.nbytes, req->creq.info);
	62
	63	spin_lock_bh(&ctx->lock);
	64
	65	ivsize = crypto_ablkcipher_ivsize(geniv);
	66
	67	memcpy(req->giv, ctx->iv, ivsize);
	68	memcpy(subreq->info, ctx->iv, ivsize);
	69
	70	err = crypto_ablkcipher_encrypt(subreq);
	71	if (err)
	72	goto unlock;
	73
	74	memcpy(ctx->iv, subreq->info, ivsize);
	75
	76	unlock:
	77	spin_unlock_bh(&ctx->lock);
	78
	79	return err;
	80	}
	81
	82	static int chainiv_givencrypt_first(struct skcipher_givcrypt_request *req)
	83	{
	84	struct crypto_ablkcipher *geniv = skcipher_givcrypt_reqtfm(req);
	85	struct chainiv_ctx *ctx = crypto_ablkcipher_ctx(geniv);
a0f000ec	86	int err = 0;
7f470739 HX	87
	88	spin_lock_bh(&ctx->lock);
	89	if (crypto_ablkcipher_crt(geniv)->givencrypt !=
	90	chainiv_givencrypt_first)
	91	goto unlock;
	92
	93	crypto_ablkcipher_crt(geniv)->givencrypt = chainiv_givencrypt;
a0f000ec HX	94	err = crypto_rng_get_bytes(crypto_default_rng, ctx->iv,
a0f000ec HX	95	crypto_ablkcipher_ivsize(geniv));
7f470739 HX	96
	97	unlock:
	98	spin_unlock_bh(&ctx->lock);
	99
a0f000ec HX	100	if (err)
	101	return err;
	102
7f470739 HX	103	return chainiv_givencrypt(req);
	104	}
	105
e7cd2514 HX	106	static int chainiv_init_common(struct crypto_tfm *tfm)
	107	{
	108	tfm->crt_ablkcipher.reqsize = sizeof(struct ablkcipher_request);
	109
	110	return skcipher_geniv_init(tfm);
	111	}
	112
7f470739 HX	113	static int chainiv_init(struct crypto_tfm *tfm)
7f470739 HX	114	{
e7cd2514	115	struct chainiv_ctx *ctx = crypto_tfm_ctx(tfm);
7f470739 HX	116
	117	spin_lock_init(&ctx->lock);
	118
e7cd2514 HX	119	return chainiv_init_common(tfm);
e7cd2514 HX	120	}
7f470739	121
e7cd2514 HX	122	static int async_chainiv_schedule_work(struct async_chainiv_ctx *ctx)
	123	{
	124	int queued;
872ac874	125	int err = ctx->err;
e7cd2514 HX	126
	127	if (!ctx->queue.qlen) {
	128	smp_mb__before_clear_bit();
	129	clear_bit(CHAINIV_STATE_INUSE, &ctx->state);
	130
	131	if (!ctx->queue.qlen \|\|
	132	test_and_set_bit(CHAINIV_STATE_INUSE, &ctx->state))
	133	goto out;
	134	}
	135
	136	queued = schedule_work(&ctx->postponed);
	137	BUG_ON(!queued);
	138
	139	out:
872ac874	140	return err;
e7cd2514 HX	141	}
	142
	143	static int async_chainiv_postpone_request(struct skcipher_givcrypt_request *req)
	144	{
	145	struct crypto_ablkcipher *geniv = skcipher_givcrypt_reqtfm(req);
	146	struct async_chainiv_ctx *ctx = crypto_ablkcipher_ctx(geniv);
	147	int err;
	148
	149	spin_lock_bh(&ctx->lock);
	150	err = skcipher_enqueue_givcrypt(&ctx->queue, req);
	151	spin_unlock_bh(&ctx->lock);
	152
	153	if (test_and_set_bit(CHAINIV_STATE_INUSE, &ctx->state))
	154	return err;
	155
	156	ctx->err = err;
	157	return async_chainiv_schedule_work(ctx);
	158	}
	159
	160	static int async_chainiv_givencrypt_tail(struct skcipher_givcrypt_request *req)
	161	{
	162	struct crypto_ablkcipher *geniv = skcipher_givcrypt_reqtfm(req);
	163	struct async_chainiv_ctx *ctx = crypto_ablkcipher_ctx(geniv);
	164	struct ablkcipher_request *subreq = skcipher_givcrypt_reqctx(req);
	165	unsigned int ivsize = crypto_ablkcipher_ivsize(geniv);
	166
	167	memcpy(req->giv, ctx->iv, ivsize);
	168	memcpy(subreq->info, ctx->iv, ivsize);
	169
	170	ctx->err = crypto_ablkcipher_encrypt(subreq);
	171	if (ctx->err)
	172	goto out;
	173
	174	memcpy(ctx->iv, subreq->info, ivsize);
	175
	176	out:
	177	return async_chainiv_schedule_work(ctx);
	178	}
	179
	180	static int async_chainiv_givencrypt(struct skcipher_givcrypt_request *req)
	181	{
	182	struct crypto_ablkcipher *geniv = skcipher_givcrypt_reqtfm(req);
	183	struct async_chainiv_ctx *ctx = crypto_ablkcipher_ctx(geniv);
	184	struct ablkcipher_request *subreq = skcipher_givcrypt_reqctx(req);
	185
	186	ablkcipher_request_set_tfm(subreq, skcipher_geniv_cipher(geniv));
	187	ablkcipher_request_set_callback(subreq, req->creq.base.flags,
	188	req->creq.base.complete,
	189	req->creq.base.data);
	190	ablkcipher_request_set_crypt(subreq, req->creq.src, req->creq.dst,
	191	req->creq.nbytes, req->creq.info);
	192
	193	if (test_and_set_bit(CHAINIV_STATE_INUSE, &ctx->state))
	194	goto postpone;
	195
	196	if (ctx->queue.qlen) {
	197	clear_bit(CHAINIV_STATE_INUSE, &ctx->state);
	198	goto postpone;
	199	}
	200
	201	return async_chainiv_givencrypt_tail(req);
	202
	203	postpone:
	204	return async_chainiv_postpone_request(req);
205	}
206
207	static int async_chainiv_givencrypt_first(struct skcipher_givcrypt_request *req)
208	{
209	struct crypto_ablkcipher *geniv = skcipher_givcrypt_reqtfm(req);
210	struct async_chainiv_ctx *ctx = crypto_ablkcipher_ctx(geniv);
a0f000ec	211	int err = 0;
e7cd2514 HX	212
	213	if (test_and_set_bit(CHAINIV_STATE_INUSE, &ctx->state))
	214	goto out;
	215
	216	if (crypto_ablkcipher_crt(geniv)->givencrypt !=
	217	async_chainiv_givencrypt_first)
	218	goto unlock;
	219
	220	crypto_ablkcipher_crt(geniv)->givencrypt = async_chainiv_givencrypt;
a0f000ec HX	221	err = crypto_rng_get_bytes(crypto_default_rng, ctx->iv,
a0f000ec HX	222	crypto_ablkcipher_ivsize(geniv));
e7cd2514 HX	223
	224	unlock:
	225	clear_bit(CHAINIV_STATE_INUSE, &ctx->state);
	226
a0f000ec HX	227	if (err)
	228	return err;
	229
e7cd2514 HX	230	out:
	231	return async_chainiv_givencrypt(req);
	232	}
	233
	234	static void async_chainiv_do_postponed(struct work_struct *work)
	235	{
	236	struct async_chainiv_ctx *ctx = container_of(work,
	237	struct async_chainiv_ctx,
	238	postponed);
	239	struct skcipher_givcrypt_request *req;
	240	struct ablkcipher_request *subreq;
872ac874	241	int err;
e7cd2514 HX	242
	243	/* Only handle one request at a time to avoid hogging keventd. */
	244	spin_lock_bh(&ctx->lock);
	245	req = skcipher_dequeue_givcrypt(&ctx->queue);
	246	spin_unlock_bh(&ctx->lock);
	247
	248	if (!req) {
	249	async_chainiv_schedule_work(ctx);
	250	return;
	251	}
	252
	253	subreq = skcipher_givcrypt_reqctx(req);
	254	subreq->base.flags \|= CRYPTO_TFM_REQ_MAY_SLEEP;
	255
872ac874 HX	256	err = async_chainiv_givencrypt_tail(req);
	257
	258	local_bh_disable();
	259	skcipher_givcrypt_complete(req, err);
	260	local_bh_enable();
e7cd2514 HX	261	}
	262
	263	static int async_chainiv_init(struct crypto_tfm *tfm)
	264	{
	265	struct async_chainiv_ctx *ctx = crypto_tfm_ctx(tfm);
	266
	267	spin_lock_init(&ctx->lock);
	268
	269	crypto_init_queue(&ctx->queue, 100);
	270	INIT_WORK(&ctx->postponed, async_chainiv_do_postponed);
	271
	272	return chainiv_init_common(tfm);
	273	}
	274
	275	static void async_chainiv_exit(struct crypto_tfm *tfm)
	276	{
	277	struct async_chainiv_ctx *ctx = crypto_tfm_ctx(tfm);
	278
	279	BUG_ON(test_bit(CHAINIV_STATE_INUSE, &ctx->state) \|\| ctx->queue.qlen);
	280
	281	skcipher_geniv_exit(tfm);
7f470739 HX	282	}
	283
	284	static struct crypto_template chainiv_tmpl;
	285
	286	static struct crypto_instance chainiv_alloc(struct rtattr *tb)
	287	{
e7cd2514	288	struct crypto_attr_type *algt;
7f470739	289	struct crypto_instance *inst;
e7cd2514	290	int err;
7f470739	291
e7cd2514 HX	292	algt = crypto_get_attr_type(tb);
	293	err = PTR_ERR(algt);
	294	if (IS_ERR(algt))
	295	return ERR_PTR(err);
	296
a0f000ec HX	297	err = crypto_get_default_rng();
	298	if (err)
	299	return ERR_PTR(err);
	300
e7cd2514	301	inst = skcipher_geniv_alloc(&chainiv_tmpl, tb, 0, 0);
7f470739	302	if (IS_ERR(inst))
a0f000ec	303	goto put_rng;
7f470739 HX	304
	305	inst->alg.cra_ablkcipher.givencrypt = chainiv_givencrypt_first;
	306
	307	inst->alg.cra_init = chainiv_init;
	308	inst->alg.cra_exit = skcipher_geniv_exit;
	309
e7cd2514 HX	310	inst->alg.cra_ctxsize = sizeof(struct chainiv_ctx);
	311
	312	if (!crypto_requires_sync(algt->type, algt->mask)) {
	313	inst->alg.cra_flags \|= CRYPTO_ALG_ASYNC;
	314
	315	inst->alg.cra_ablkcipher.givencrypt =
	316	async_chainiv_givencrypt_first;
	317
	318	inst->alg.cra_init = async_chainiv_init;
	319	inst->alg.cra_exit = async_chainiv_exit;
	320
	321	inst->alg.cra_ctxsize = sizeof(struct async_chainiv_ctx);
	322	}
	323
	324	inst->alg.cra_ctxsize += inst->alg.cra_ablkcipher.ivsize;
7f470739 HX	325
	326	out:
	327	return inst;
a0f000ec HX	328
	329	put_rng:
	330	crypto_put_default_rng();
	331	goto out;
	332	}
	333
	334	static void chainiv_free(struct crypto_instance *inst)
	335	{
	336	skcipher_geniv_free(inst);
	337	crypto_put_default_rng();
7f470739 HX	338	}
	339
	340	static struct crypto_template chainiv_tmpl = {
	341	.name = "chainiv",
	342	.alloc = chainiv_alloc,
a0f000ec	343	.free = chainiv_free,
7f470739 HX	344	.module = THIS_MODULE,
	345	};
	346
5be5e667	347	static int __init chainiv_module_init(void)
7f470739 HX	348	{
	349	return crypto_register_template(&chainiv_tmpl);
	350	}
	351
5be5e667	352	static void chainiv_module_exit(void)
7f470739 HX	353	{
	354	crypto_unregister_template(&chainiv_tmpl);
	355	}
5be5e667 HX	356
	357	module_init(chainiv_module_init);
	358	module_exit(chainiv_module_exit);
	359
	360	MODULE_LICENSE("GPL");
	361	MODULE_DESCRIPTION("Chain IV Generator");