[linux-2.6-block.git] / crypto / seqiv.c

/*
 * seqiv: Sequence Number IV Generator
 *
 * This generator generates an IV based on a sequence number by xoring it
 * with a salt.  This algorithm is mainly useful for CTR and similar modes.
 *
 * 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/geniv.h>
#include <crypto/internal/skcipher.h>
#include <crypto/rng.h>
#include <crypto/scatterwalk.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/string.h>

struct seqiv_ctx {
	spinlock_t lock;
	u8 salt[] __attribute__ ((aligned(__alignof__(u32))));
};

static void seqiv_free(struct crypto_instance *inst);

static void seqiv_complete2(struct skcipher_givcrypt_request *req, int err)
{
	struct ablkcipher_request *subreq = skcipher_givcrypt_reqctx(req);
	struct crypto_ablkcipher *geniv;

	if (err == -EINPROGRESS)
		return;

	if (err)
		goto out;

	geniv = skcipher_givcrypt_reqtfm(req);
	memcpy(req->creq.info, subreq->info, crypto_ablkcipher_ivsize(geniv));

out:
	kfree(subreq->info);
}

static void seqiv_complete(struct crypto_async_request *base, int err)
{
	struct skcipher_givcrypt_request *req = base->data;

	seqiv_complete2(req, err);
	skcipher_givcrypt_complete(req, err);
}

static void seqiv_aead_encrypt_complete2(struct aead_request *req, int err)
{
	struct aead_request *subreq = aead_request_ctx(req);
	struct crypto_aead *geniv;

	if (err == -EINPROGRESS)
		return;

	if (err)
		goto out;

	geniv = crypto_aead_reqtfm(req);
	memcpy(req->iv, subreq->iv, crypto_aead_ivsize(geniv));

out:
	kzfree(subreq->iv);
}

static void seqiv_aead_encrypt_complete(struct crypto_async_request *base,
					int err)
{
	struct aead_request *req = base->data;

	seqiv_aead_encrypt_complete2(req, err);
	aead_request_complete(req, err);
}

static void seqiv_geniv(struct seqiv_ctx *ctx, u8 *info, u64 seq,
			unsigned int ivsize)
{
	unsigned int len = ivsize;

	if (ivsize > sizeof(u64)) {
		memset(info, 0, ivsize - sizeof(u64));
		len = sizeof(u64);
	}
	seq = cpu_to_be64(seq);
	memcpy(info + ivsize - len, &seq, len);
	crypto_xor(info, ctx->salt, ivsize);
}

static int seqiv_givencrypt(struct skcipher_givcrypt_request *req)
{
	struct crypto_ablkcipher *geniv = skcipher_givcrypt_reqtfm(req);
	struct seqiv_ctx *ctx = crypto_ablkcipher_ctx(geniv);
	struct ablkcipher_request *subreq = skcipher_givcrypt_reqctx(req);
	crypto_completion_t compl;
	void *data;
	u8 *info;
	unsigned int ivsize;
	int err;

	ablkcipher_request_set_tfm(subreq, skcipher_geniv_cipher(geniv));

	compl = req->creq.base.complete;
	data = req->creq.base.data;
	info = req->creq.info;

	ivsize = crypto_ablkcipher_ivsize(geniv);

	if (unlikely(!IS_ALIGNED((unsigned long)info,
				 crypto_ablkcipher_alignmask(geniv) + 1))) {
		info = kmalloc(ivsize, req->creq.base.flags &
				       CRYPTO_TFM_REQ_MAY_SLEEP ? GFP_KERNEL:
								  GFP_ATOMIC);
		if (!info)
			return -ENOMEM;

		compl = seqiv_complete;
		data = req;
	}

	ablkcipher_request_set_callback(subreq, req->creq.base.flags, compl,
					data);
	ablkcipher_request_set_crypt(subreq, req->creq.src, req->creq.dst,
				     req->creq.nbytes, info);

	seqiv_geniv(ctx, info, req->seq, ivsize);
	memcpy(req->giv, info, ivsize);

	err = crypto_ablkcipher_encrypt(subreq);
	if (unlikely(info != req->creq.info))
		seqiv_complete2(req, err);
	return err;
}

static int seqiv_aead_encrypt(struct aead_request *req)
{
	struct crypto_aead *geniv = crypto_aead_reqtfm(req);
	struct aead_geniv_ctx *ctx = crypto_aead_ctx(geniv);
	struct aead_request *subreq = aead_request_ctx(req);
	crypto_completion_t compl;
	void *data;
	u8 *info;
	unsigned int ivsize = 8;
	int err;

	if (req->cryptlen < ivsize)
		return -EINVAL;

	aead_request_set_tfm(subreq, ctx->child);

	compl = req->base.complete;
	data = req->base.data;
	info = req->iv;

	if (req->src != req->dst) {
		struct blkcipher_desc desc = {
			.tfm = ctx->null,
		};

		err = crypto_blkcipher_encrypt(&desc, req->dst, req->src,
					       req->assoclen + req->cryptlen);
		if (err)
			return err;
	}

	if (unlikely(!IS_ALIGNED((unsigned long)info,
				 crypto_aead_alignmask(geniv) + 1))) {
		info = kmalloc(ivsize, req->base.flags &
				       CRYPTO_TFM_REQ_MAY_SLEEP ? GFP_KERNEL:
								  GFP_ATOMIC);
		if (!info)
			return -ENOMEM;

		memcpy(info, req->iv, ivsize);
		compl = seqiv_aead_encrypt_complete;
		data = req;
	}

	aead_request_set_callback(subreq, req->base.flags, compl, data);
	aead_request_set_crypt(subreq, req->dst, req->dst,
			       req->cryptlen - ivsize, info);
	aead_request_set_ad(subreq, req->assoclen + ivsize);

	crypto_xor(info, ctx->salt, ivsize);
	scatterwalk_map_and_copy(info, req->dst, req->assoclen, ivsize, 1);

	err = crypto_aead_encrypt(subreq);
	if (unlikely(info != req->iv))
		seqiv_aead_encrypt_complete2(req, err);
	return err;
}

static int seqiv_aead_decrypt(struct aead_request *req)
{
	struct crypto_aead *geniv = crypto_aead_reqtfm(req);
	struct aead_geniv_ctx *ctx = crypto_aead_ctx(geniv);
	struct aead_request *subreq = aead_request_ctx(req);
	crypto_completion_t compl;
	void *data;
	unsigned int ivsize = 8;

	if (req->cryptlen < ivsize + crypto_aead_authsize(geniv))
		return -EINVAL;

	aead_request_set_tfm(subreq, ctx->child);

	compl = req->base.complete;
	data = req->base.data;

	aead_request_set_callback(subreq, req->base.flags, compl, data);
	aead_request_set_crypt(subreq, req->src, req->dst,
			       req->cryptlen - ivsize, req->iv);
	aead_request_set_ad(subreq, req->assoclen + ivsize);

	scatterwalk_map_and_copy(req->iv, req->src, req->assoclen, ivsize, 0);

	return crypto_aead_decrypt(subreq);
}

static int seqiv_init(struct crypto_tfm *tfm)
{
	struct crypto_ablkcipher *geniv = __crypto_ablkcipher_cast(tfm);
	struct seqiv_ctx *ctx = crypto_ablkcipher_ctx(geniv);
	int err;

	spin_lock_init(&ctx->lock);

	tfm->crt_ablkcipher.reqsize = sizeof(struct ablkcipher_request);

	err = 0;
	if (!crypto_get_default_rng()) {
		crypto_ablkcipher_crt(geniv)->givencrypt = seqiv_givencrypt;
		err = crypto_rng_get_bytes(crypto_default_rng, ctx->salt,
					   crypto_ablkcipher_ivsize(geniv));
		crypto_put_default_rng();
	}

	return err ?: skcipher_geniv_init(tfm);
}

static int seqiv_ablkcipher_create(struct crypto_template *tmpl,
				   struct rtattr **tb)
{
	struct crypto_instance *inst;
	int err;

	inst = skcipher_geniv_alloc(tmpl, tb, 0, 0);

	if (IS_ERR(inst))
		return PTR_ERR(inst);

	err = -EINVAL;
	if (inst->alg.cra_ablkcipher.ivsize < sizeof(u64))
		goto free_inst;

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

	inst->alg.cra_ctxsize += inst->alg.cra_ablkcipher.ivsize;
	inst->alg.cra_ctxsize += sizeof(struct seqiv_ctx);

	inst->alg.cra_alignmask |= __alignof__(u32) - 1;

	err = crypto_register_instance(tmpl, inst);
	if (err)
		goto free_inst;

out:
	return err;

free_inst:
	skcipher_geniv_free(inst);
	goto out;
}

static int seqiv_aead_create(struct crypto_template *tmpl, struct rtattr **tb)
{
	struct aead_instance *inst;
	struct crypto_aead_spawn *spawn;
	struct aead_alg *alg;
	int err;

	inst = aead_geniv_alloc(tmpl, tb, 0, 0);

	if (IS_ERR(inst))
		return PTR_ERR(inst);

	inst->alg.base.cra_alignmask |= __alignof__(u32) - 1;

	spawn = aead_instance_ctx(inst);
	alg = crypto_spawn_aead_alg(spawn);

	err = -EINVAL;
	if (inst->alg.ivsize != sizeof(u64))
		goto free_inst;

	inst->alg.encrypt = seqiv_aead_encrypt;
	inst->alg.decrypt = seqiv_aead_decrypt;

	inst->alg.init = aead_init_geniv;
	inst->alg.exit = aead_exit_geniv;

	inst->alg.base.cra_ctxsize = sizeof(struct aead_geniv_ctx);
	inst->alg.base.cra_ctxsize += inst->alg.ivsize;

	err = aead_register_instance(tmpl, inst);
	if (err)
		goto free_inst;

out:
	return err;

free_inst:
	aead_geniv_free(inst);
	goto out;
}

static int seqiv_create(struct crypto_template *tmpl, struct rtattr **tb)
{
	struct crypto_attr_type *algt;
	int err;

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

	if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & CRYPTO_ALG_TYPE_MASK)
		err = seqiv_ablkcipher_create(tmpl, tb);
	else
		err = seqiv_aead_create(tmpl, tb);

	return err;
}

static void seqiv_free(struct crypto_instance *inst)
{
	if ((inst->alg.cra_flags ^ CRYPTO_ALG_TYPE_AEAD) & CRYPTO_ALG_TYPE_MASK)
		skcipher_geniv_free(inst);
	else
		aead_geniv_free(aead_instance(inst));
}

static struct crypto_template seqiv_tmpl = {
	.name = "seqiv",
	.create = seqiv_create,
	.free = seqiv_free,
	.module = THIS_MODULE,
};

static int __init seqiv_module_init(void)
{
	return crypto_register_template(&seqiv_tmpl);
}

static void __exit seqiv_module_exit(void)
{
	crypto_unregister_template(&seqiv_tmpl);
}

module_init(seqiv_module_init);
module_exit(seqiv_module_exit);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Sequence Number IV Generator");
MODULE_ALIAS_CRYPTO("seqiv");
Commit	Line	Data
0a270321 HX	1	/*
	2	* seqiv: Sequence Number IV Generator
	3	*
	4	* This generator generates an IV based on a sequence number by xoring it
	5	* with a salt. This algorithm is mainly useful for CTR and similar modes.
	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
661cfd0e	16	#include <crypto/internal/geniv.h>
0a270321	17	#include <crypto/internal/skcipher.h>
a0f000ec	18	#include <crypto/rng.h>
856e3f40	19	#include <crypto/scatterwalk.h>
0a270321 HX	20	#include <linux/err.h>
	21	#include <linux/init.h>
	22	#include <linux/kernel.h>
	23	#include <linux/module.h>
5a0e3ad6	24	#include <linux/slab.h>
0a270321 HX	25	#include <linux/spinlock.h>
	26	#include <linux/string.h>
	27
	28	struct seqiv_ctx {
	29	spinlock_t lock;
	30	u8 salt[] __attribute__ ((aligned(__alignof__(u32))));
	31	};
	32
0677157b HX	33	static void seqiv_free(struct crypto_instance *inst);
0677157b HX	34
0a270321 HX	35	static void seqiv_complete2(struct skcipher_givcrypt_request *req, int err)
	36	{
	37	struct ablkcipher_request *subreq = skcipher_givcrypt_reqctx(req);
	38	struct crypto_ablkcipher *geniv;
	39
	40	if (err == -EINPROGRESS)
	41	return;
	42
	43	if (err)
	44	goto out;
	45
	46	geniv = skcipher_givcrypt_reqtfm(req);
	47	memcpy(req->creq.info, subreq->info, crypto_ablkcipher_ivsize(geniv));
	48
	49	out:
	50	kfree(subreq->info);
	51	}
	52
	53	static void seqiv_complete(struct crypto_async_request *base, int err)
	54	{
	55	struct skcipher_givcrypt_request *req = base->data;
	56
	57	seqiv_complete2(req, err);
	58	skcipher_givcrypt_complete(req, err);
	59	}
	60
856e3f40 HX	61	static void seqiv_aead_encrypt_complete2(struct aead_request *req, int err)
	62	{
	63	struct aead_request *subreq = aead_request_ctx(req);
	64	struct crypto_aead *geniv;
	65
	66	if (err == -EINPROGRESS)
	67	return;
	68
	69	if (err)
	70	goto out;
	71
	72	geniv = crypto_aead_reqtfm(req);
	73	memcpy(req->iv, subreq->iv, crypto_aead_ivsize(geniv));
	74
	75	out:
	76	kzfree(subreq->iv);
	77	}
	78
	79	static void seqiv_aead_encrypt_complete(struct crypto_async_request *base,
	80	int err)
	81	{
	82	struct aead_request *req = base->data;
	83
	84	seqiv_aead_encrypt_complete2(req, err);
	85	aead_request_complete(req, err);
	86	}
	87
14df4d80 HX	88	static void seqiv_geniv(struct seqiv_ctx ctx, u8 info, u64 seq,
	89	unsigned int ivsize)
	90	{
	91	unsigned int len = ivsize;
	92
	93	if (ivsize > sizeof(u64)) {
	94	memset(info, 0, ivsize - sizeof(u64));
	95	len = sizeof(u64);
	96	}
	97	seq = cpu_to_be64(seq);
	98	memcpy(info + ivsize - len, &seq, len);
	99	crypto_xor(info, ctx->salt, ivsize);
	100	}
	101
0a270321 HX	102	static int seqiv_givencrypt(struct skcipher_givcrypt_request *req)
	103	{
	104	struct crypto_ablkcipher *geniv = skcipher_givcrypt_reqtfm(req);
	105	struct seqiv_ctx *ctx = crypto_ablkcipher_ctx(geniv);
	106	struct ablkcipher_request *subreq = skcipher_givcrypt_reqctx(req);
3e3dc25f	107	crypto_completion_t compl;
0a270321 HX	108	void *data;
0a270321 HX	109	u8 *info;
0a270321	110	unsigned int ivsize;
0a270321 HX	111	int err;
	112
	113	ablkcipher_request_set_tfm(subreq, skcipher_geniv_cipher(geniv));
	114
3e3dc25f	115	compl = req->creq.base.complete;
0a270321 HX	116	data = req->creq.base.data;
	117	info = req->creq.info;
	118
	119	ivsize = crypto_ablkcipher_ivsize(geniv);
	120
	121	if (unlikely(!IS_ALIGNED((unsigned long)info,
	122	crypto_ablkcipher_alignmask(geniv) + 1))) {
	123	info = kmalloc(ivsize, req->creq.base.flags &
	124	CRYPTO_TFM_REQ_MAY_SLEEP ? GFP_KERNEL:
	125	GFP_ATOMIC);
	126	if (!info)
	127	return -ENOMEM;
	128
3e3dc25f	129	compl = seqiv_complete;
0a270321 HX	130	data = req;
	131	}
	132
3e3dc25f	133	ablkcipher_request_set_callback(subreq, req->creq.base.flags, compl,
0a270321 HX	134	data);
	135	ablkcipher_request_set_crypt(subreq, req->creq.src, req->creq.dst,
	136	req->creq.nbytes, info);
	137
14df4d80	138	seqiv_geniv(ctx, info, req->seq, ivsize);
0a270321 HX	139	memcpy(req->giv, info, ivsize);
	140
	141	err = crypto_ablkcipher_encrypt(subreq);
	142	if (unlikely(info != req->creq.info))
	143	seqiv_complete2(req, err);
	144	return err;
	145	}
	146
856e3f40 HX	147	static int seqiv_aead_encrypt(struct aead_request *req)
	148	{
	149	struct crypto_aead *geniv = crypto_aead_reqtfm(req);
659e7f52	150	struct aead_geniv_ctx *ctx = crypto_aead_ctx(geniv);
856e3f40 HX	151	struct aead_request *subreq = aead_request_ctx(req);
	152	crypto_completion_t compl;
	153	void *data;
	154	u8 *info;
dd04446e	155	unsigned int ivsize = 8;
856e3f40 HX	156	int err;
856e3f40 HX	157
dd04446e HX	158	if (req->cryptlen < ivsize)
	159	return -EINVAL;
	160
659e7f52	161	aead_request_set_tfm(subreq, ctx->child);
856e3f40 HX	162
	163	compl = req->base.complete;
	164	data = req->base.data;
	165	info = req->iv;
	166
856e3f40	167	if (req->src != req->dst) {
856e3f40 HX	168	struct blkcipher_desc desc = {
	169	.tfm = ctx->null,
	170	};
	171
d0ad1b24 HX	172	err = crypto_blkcipher_encrypt(&desc, req->dst, req->src,
d0ad1b24 HX	173	req->assoclen + req->cryptlen);
856e3f40 HX	174	if (err)
	175	return err;
	176	}
	177
	178	if (unlikely(!IS_ALIGNED((unsigned long)info,
	179	crypto_aead_alignmask(geniv) + 1))) {
	180	info = kmalloc(ivsize, req->base.flags &
	181	CRYPTO_TFM_REQ_MAY_SLEEP ? GFP_KERNEL:
	182	GFP_ATOMIC);
	183	if (!info)
	184	return -ENOMEM;
	185
	186	memcpy(info, req->iv, ivsize);
	187	compl = seqiv_aead_encrypt_complete;
	188	data = req;
	189	}
	190
	191	aead_request_set_callback(subreq, req->base.flags, compl, data);
	192	aead_request_set_crypt(subreq, req->dst, req->dst,
	193	req->cryptlen - ivsize, info);
374d4ad1	194	aead_request_set_ad(subreq, req->assoclen + ivsize);
856e3f40 HX	195
	196	crypto_xor(info, ctx->salt, ivsize);
	197	scatterwalk_map_and_copy(info, req->dst, req->assoclen, ivsize, 1);
	198
	199	err = crypto_aead_encrypt(subreq);
	200	if (unlikely(info != req->iv))
	201	seqiv_aead_encrypt_complete2(req, err);
	202	return err;
	203	}
	204
856e3f40 HX	205	static int seqiv_aead_decrypt(struct aead_request *req)
	206	{
	207	struct crypto_aead *geniv = crypto_aead_reqtfm(req);
659e7f52	208	struct aead_geniv_ctx *ctx = crypto_aead_ctx(geniv);
856e3f40 HX	209	struct aead_request *subreq = aead_request_ctx(req);
	210	crypto_completion_t compl;
	211	void *data;
dd04446e HX	212	unsigned int ivsize = 8;
	213
	214	if (req->cryptlen < ivsize + crypto_aead_authsize(geniv))
	215	return -EINVAL;
856e3f40	216
659e7f52	217	aead_request_set_tfm(subreq, ctx->child);
856e3f40 HX	218
	219	compl = req->base.complete;
	220	data = req->base.data;
	221
856e3f40 HX	222	aead_request_set_callback(subreq, req->base.flags, compl, data);
	223	aead_request_set_crypt(subreq, req->src, req->dst,
	224	req->cryptlen - ivsize, req->iv);
374d4ad1	225	aead_request_set_ad(subreq, req->assoclen + ivsize);
856e3f40 HX	226
856e3f40 HX	227	scatterwalk_map_and_copy(req->iv, req->src, req->assoclen, ivsize, 0);
856e3f40 HX	228
	229	return crypto_aead_decrypt(subreq);
	230	}
	231
0a270321 HX	232	static int seqiv_init(struct crypto_tfm *tfm)
	233	{
	234	struct crypto_ablkcipher *geniv = __crypto_ablkcipher_cast(tfm);
	235	struct seqiv_ctx *ctx = crypto_ablkcipher_ctx(geniv);
eeee12aa	236	int err;
0a270321 HX	237
	238	spin_lock_init(&ctx->lock);
	239
	240	tfm->crt_ablkcipher.reqsize = sizeof(struct ablkcipher_request);
	241
eeee12aa HX	242	err = 0;
	243	if (!crypto_get_default_rng()) {
	244	crypto_ablkcipher_crt(geniv)->givencrypt = seqiv_givencrypt;
	245	err = crypto_rng_get_bytes(crypto_default_rng, ctx->salt,
	246	crypto_ablkcipher_ivsize(geniv));
	247	crypto_put_default_rng();
	248	}
	249
	250	return err ?: skcipher_geniv_init(tfm);
0a270321 HX	251	}
0a270321 HX	252
0677157b HX	253	static int seqiv_ablkcipher_create(struct crypto_template *tmpl,
0677157b HX	254	struct rtattr **tb)
0a270321 HX	255	{
0a270321 HX	256	struct crypto_instance *inst;
0677157b	257	int err;
0a270321	258
0677157b	259	inst = skcipher_geniv_alloc(tmpl, tb, 0, 0);
14df4d80	260
0a270321	261	if (IS_ERR(inst))
0677157b	262	return PTR_ERR(inst);
0a270321	263
0677157b HX	264	err = -EINVAL;
	265	if (inst->alg.cra_ablkcipher.ivsize < sizeof(u64))
	266	goto free_inst;
c0ecf891	267
0a270321 HX	268	inst->alg.cra_init = seqiv_init;
	269	inst->alg.cra_exit = skcipher_geniv_exit;
	270
0a270321	271	inst->alg.cra_ctxsize += inst->alg.cra_ablkcipher.ivsize;
856e3f40	272	inst->alg.cra_ctxsize += sizeof(struct seqiv_ctx);
0a270321	273
0677157b HX	274	inst->alg.cra_alignmask \|= __alignof__(u32) - 1;
	275
	276	err = crypto_register_instance(tmpl, inst);
	277	if (err)
	278	goto free_inst;
	279
0a270321	280	out:
0677157b HX	281	return err;
	282
	283	free_inst:
	284	skcipher_geniv_free(inst);
	285	goto out;
0a270321 HX	286	}
0a270321 HX	287
0677157b	288	static int seqiv_aead_create(struct crypto_template tmpl, struct rtattr *tb)
14df4d80	289	{
856e3f40 HX	290	struct aead_instance *inst;
	291	struct crypto_aead_spawn *spawn;
	292	struct aead_alg *alg;
0677157b	293	int err;
14df4d80	294
0677157b	295	inst = aead_geniv_alloc(tmpl, tb, 0, 0);
14df4d80 HX	296
14df4d80 HX	297	if (IS_ERR(inst))
0677157b HX	298	return PTR_ERR(inst);
	299
	300	inst->alg.base.cra_alignmask \|= __alignof__(u32) - 1;
14df4d80	301
661cfd0e HX	302	spawn = aead_instance_ctx(inst);
	303	alg = crypto_spawn_aead_alg(spawn);
	304
0677157b	305	err = -EINVAL;
dd04446e	306	if (inst->alg.ivsize != sizeof(u64))
0677157b	307	goto free_inst;
c0ecf891	308
b7dcfab4	309	inst->alg.encrypt = seqiv_aead_encrypt;
856e3f40	310	inst->alg.decrypt = seqiv_aead_decrypt;
14df4d80	311
659e7f52 HX	312	inst->alg.init = aead_init_geniv;
659e7f52 HX	313	inst->alg.exit = aead_exit_geniv;
856e3f40	314
659e7f52	315	inst->alg.base.cra_ctxsize = sizeof(struct aead_geniv_ctx);
5964f26c	316	inst->alg.base.cra_ctxsize += inst->alg.ivsize;
856e3f40	317
0677157b HX	318	err = aead_register_instance(tmpl, inst);
	319	if (err)
	320	goto free_inst;
	321
14df4d80	322	out:
0677157b HX	323	return err;
	324
	325	free_inst:
	326	aead_geniv_free(inst);
	327	goto out;
14df4d80 HX	328	}
14df4d80 HX	329
0677157b	330	static int seqiv_create(struct crypto_template tmpl, struct rtattr *tb)
14df4d80 HX	331	{
14df4d80 HX	332	struct crypto_attr_type *algt;
14df4d80 HX	333	int err;
	334
	335	algt = crypto_get_attr_type(tb);
14df4d80	336	if (IS_ERR(algt))
0677157b	337	return PTR_ERR(algt);
14df4d80 HX	338
14df4d80 HX	339	if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & CRYPTO_ALG_TYPE_MASK)
0677157b	340	err = seqiv_ablkcipher_create(tmpl, tb);
14df4d80	341	else
0677157b	342	err = seqiv_aead_create(tmpl, tb);
14df4d80	343
0677157b	344	return err;
14df4d80 HX	345	}
	346
	347	static void seqiv_free(struct crypto_instance *inst)
	348	{
	349	if ((inst->alg.cra_flags ^ CRYPTO_ALG_TYPE_AEAD) & CRYPTO_ALG_TYPE_MASK)
	350	skcipher_geniv_free(inst);
	351	else
856e3f40	352	aead_geniv_free(aead_instance(inst));
14df4d80 HX	353	}
14df4d80 HX	354
0a270321 HX	355	static struct crypto_template seqiv_tmpl = {
0a270321 HX	356	.name = "seqiv",
0677157b	357	.create = seqiv_create,
14df4d80	358	.free = seqiv_free,
0a270321 HX	359	.module = THIS_MODULE,
	360	};
	361
	362	static int __init seqiv_module_init(void)
	363	{
8a2cd1c4	364	return crypto_register_template(&seqiv_tmpl);
0a270321 HX	365	}
	366
	367	static void __exit seqiv_module_exit(void)
	368	{
	369	crypto_unregister_template(&seqiv_tmpl);
	370	}
	371
	372	module_init(seqiv_module_init);
	373	module_exit(seqiv_module_exit);
	374
	375	MODULE_LICENSE("GPL");
	376	MODULE_DESCRIPTION("Sequence Number IV Generator");
4943ba16	377	MODULE_ALIAS_CRYPTO("seqiv");