[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/null.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))));
};

struct seqiv_aead_ctx {
	/* aead_geniv_ctx must be first the element */
	struct aead_geniv_ctx geniv;
	struct crypto_blkcipher *null;
	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 seqiv_aead_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->geniv.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 seqiv_aead_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->geniv.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_aead_init_common(struct crypto_aead *geniv,
				  unsigned int reqsize)
{
	struct seqiv_aead_ctx *ctx = crypto_aead_ctx(geniv);
	int err;

	spin_lock_init(&ctx->geniv.lock);

	crypto_aead_set_reqsize(geniv, sizeof(struct aead_request));

	err = crypto_get_default_rng();
	if (err)
		goto out;

	err = crypto_rng_get_bytes(crypto_default_rng, ctx->salt,
				   crypto_aead_ivsize(geniv));
	crypto_put_default_rng();
	if (err)
		goto out;

	ctx->null = crypto_get_default_null_skcipher();
	err = PTR_ERR(ctx->null);
	if (IS_ERR(ctx->null))
		goto out;

	err = aead_geniv_init(crypto_aead_tfm(geniv));
	if (err)
		goto drop_null;

	ctx->geniv.child = geniv->child;
	geniv->child = geniv;

out:
	return err;

drop_null:
	crypto_put_default_null_skcipher();
	goto out;
}

static int seqiv_aead_init(struct crypto_aead *tfm)
{
	return seqiv_aead_init_common(tfm, sizeof(struct aead_request));
}

static void seqiv_aead_exit(struct crypto_aead *tfm)
{
	struct seqiv_aead_ctx *ctx = crypto_aead_ctx(tfm);

	crypto_free_aead(ctx->geniv.child);
	crypto_put_default_null_skcipher();
}

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 = seqiv_aead_init;
	inst->alg.exit = seqiv_aead_exit;

	inst->alg.base.cra_ctxsize = sizeof(struct seqiv_aead_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>
856e3f40	18	#include <crypto/null.h>
a0f000ec	19	#include <crypto/rng.h>
856e3f40	20	#include <crypto/scatterwalk.h>
0a270321 HX	21	#include <linux/err.h>
	22	#include <linux/init.h>
	23	#include <linux/kernel.h>
	24	#include <linux/module.h>
5a0e3ad6	25	#include <linux/slab.h>
0a270321 HX	26	#include <linux/spinlock.h>
	27	#include <linux/string.h>
	28
	29	struct seqiv_ctx {
	30	spinlock_t lock;
	31	u8 salt[] __attribute__ ((aligned(__alignof__(u32))));
	32	};
	33
856e3f40	34	struct seqiv_aead_ctx {
661cfd0e HX	35	/* aead_geniv_ctx must be first the element */
661cfd0e HX	36	struct aead_geniv_ctx geniv;
856e3f40 HX	37	struct crypto_blkcipher *null;
	38	u8 salt[] __attribute__ ((aligned(__alignof__(u32))));
	39	};
	40
0677157b HX	41	static void seqiv_free(struct crypto_instance *inst);
0677157b HX	42
0a270321 HX	43	static void seqiv_complete2(struct skcipher_givcrypt_request *req, int err)
	44	{
	45	struct ablkcipher_request *subreq = skcipher_givcrypt_reqctx(req);
	46	struct crypto_ablkcipher *geniv;
	47
	48	if (err == -EINPROGRESS)
	49	return;
	50
	51	if (err)
	52	goto out;
	53
	54	geniv = skcipher_givcrypt_reqtfm(req);
	55	memcpy(req->creq.info, subreq->info, crypto_ablkcipher_ivsize(geniv));
	56
	57	out:
	58	kfree(subreq->info);
	59	}
	60
	61	static void seqiv_complete(struct crypto_async_request *base, int err)
	62	{
	63	struct skcipher_givcrypt_request *req = base->data;
	64
	65	seqiv_complete2(req, err);
	66	skcipher_givcrypt_complete(req, err);
	67	}
	68
856e3f40 HX	69	static void seqiv_aead_encrypt_complete2(struct aead_request *req, int err)
	70	{
	71	struct aead_request *subreq = aead_request_ctx(req);
	72	struct crypto_aead *geniv;
	73
	74	if (err == -EINPROGRESS)
	75	return;
	76
	77	if (err)
	78	goto out;
	79
	80	geniv = crypto_aead_reqtfm(req);
	81	memcpy(req->iv, subreq->iv, crypto_aead_ivsize(geniv));
	82
	83	out:
	84	kzfree(subreq->iv);
	85	}
	86
	87	static void seqiv_aead_encrypt_complete(struct crypto_async_request *base,
	88	int err)
	89	{
	90	struct aead_request *req = base->data;
	91
	92	seqiv_aead_encrypt_complete2(req, err);
	93	aead_request_complete(req, err);
	94	}
	95
14df4d80 HX	96	static void seqiv_geniv(struct seqiv_ctx ctx, u8 info, u64 seq,
	97	unsigned int ivsize)
	98	{
	99	unsigned int len = ivsize;
	100
	101	if (ivsize > sizeof(u64)) {
	102	memset(info, 0, ivsize - sizeof(u64));
	103	len = sizeof(u64);
	104	}
	105	seq = cpu_to_be64(seq);
	106	memcpy(info + ivsize - len, &seq, len);
	107	crypto_xor(info, ctx->salt, ivsize);
	108	}
	109
0a270321 HX	110	static int seqiv_givencrypt(struct skcipher_givcrypt_request *req)
	111	{
	112	struct crypto_ablkcipher *geniv = skcipher_givcrypt_reqtfm(req);
	113	struct seqiv_ctx *ctx = crypto_ablkcipher_ctx(geniv);
	114	struct ablkcipher_request *subreq = skcipher_givcrypt_reqctx(req);
3e3dc25f	115	crypto_completion_t compl;
0a270321 HX	116	void *data;
0a270321 HX	117	u8 *info;
0a270321	118	unsigned int ivsize;
0a270321 HX	119	int err;
	120
	121	ablkcipher_request_set_tfm(subreq, skcipher_geniv_cipher(geniv));
	122
3e3dc25f	123	compl = req->creq.base.complete;
0a270321 HX	124	data = req->creq.base.data;
	125	info = req->creq.info;
	126
	127	ivsize = crypto_ablkcipher_ivsize(geniv);
	128
	129	if (unlikely(!IS_ALIGNED((unsigned long)info,
	130	crypto_ablkcipher_alignmask(geniv) + 1))) {
	131	info = kmalloc(ivsize, req->creq.base.flags &
	132	CRYPTO_TFM_REQ_MAY_SLEEP ? GFP_KERNEL:
	133	GFP_ATOMIC);
	134	if (!info)
	135	return -ENOMEM;
	136
3e3dc25f	137	compl = seqiv_complete;
0a270321 HX	138	data = req;
	139	}
	140
3e3dc25f	141	ablkcipher_request_set_callback(subreq, req->creq.base.flags, compl,
0a270321 HX	142	data);
	143	ablkcipher_request_set_crypt(subreq, req->creq.src, req->creq.dst,
	144	req->creq.nbytes, info);
	145
14df4d80	146	seqiv_geniv(ctx, info, req->seq, ivsize);
0a270321 HX	147	memcpy(req->giv, info, ivsize);
	148
	149	err = crypto_ablkcipher_encrypt(subreq);
	150	if (unlikely(info != req->creq.info))
	151	seqiv_complete2(req, err);
	152	return err;
	153	}
	154
856e3f40 HX	155	static int seqiv_aead_encrypt(struct aead_request *req)
	156	{
	157	struct crypto_aead *geniv = crypto_aead_reqtfm(req);
	158	struct seqiv_aead_ctx *ctx = crypto_aead_ctx(geniv);
	159	struct aead_request *subreq = aead_request_ctx(req);
	160	crypto_completion_t compl;
	161	void *data;
	162	u8 *info;
dd04446e	163	unsigned int ivsize = 8;
856e3f40 HX	164	int err;
856e3f40 HX	165
dd04446e HX	166	if (req->cryptlen < ivsize)
	167	return -EINVAL;
	168
661cfd0e	169	aead_request_set_tfm(subreq, ctx->geniv.child);
856e3f40 HX	170
	171	compl = req->base.complete;
	172	data = req->base.data;
	173	info = req->iv;
	174
856e3f40	175	if (req->src != req->dst) {
856e3f40 HX	176	struct blkcipher_desc desc = {
	177	.tfm = ctx->null,
	178	};
	179
d0ad1b24 HX	180	err = crypto_blkcipher_encrypt(&desc, req->dst, req->src,
d0ad1b24 HX	181	req->assoclen + req->cryptlen);
856e3f40 HX	182	if (err)
	183	return err;
	184	}
	185
	186	if (unlikely(!IS_ALIGNED((unsigned long)info,
	187	crypto_aead_alignmask(geniv) + 1))) {
	188	info = kmalloc(ivsize, req->base.flags &
	189	CRYPTO_TFM_REQ_MAY_SLEEP ? GFP_KERNEL:
	190	GFP_ATOMIC);
	191	if (!info)
	192	return -ENOMEM;
	193
	194	memcpy(info, req->iv, ivsize);
	195	compl = seqiv_aead_encrypt_complete;
	196	data = req;
	197	}
	198
	199	aead_request_set_callback(subreq, req->base.flags, compl, data);
	200	aead_request_set_crypt(subreq, req->dst, req->dst,
	201	req->cryptlen - ivsize, info);
374d4ad1	202	aead_request_set_ad(subreq, req->assoclen + ivsize);
856e3f40 HX	203
	204	crypto_xor(info, ctx->salt, ivsize);
	205	scatterwalk_map_and_copy(info, req->dst, req->assoclen, ivsize, 1);
	206
	207	err = crypto_aead_encrypt(subreq);
	208	if (unlikely(info != req->iv))
	209	seqiv_aead_encrypt_complete2(req, err);
	210	return err;
	211	}
	212
856e3f40 HX	213	static int seqiv_aead_decrypt(struct aead_request *req)
	214	{
	215	struct crypto_aead *geniv = crypto_aead_reqtfm(req);
	216	struct seqiv_aead_ctx *ctx = crypto_aead_ctx(geniv);
	217	struct aead_request *subreq = aead_request_ctx(req);
	218	crypto_completion_t compl;
	219	void *data;
dd04446e HX	220	unsigned int ivsize = 8;
	221
	222	if (req->cryptlen < ivsize + crypto_aead_authsize(geniv))
	223	return -EINVAL;
856e3f40	224
661cfd0e	225	aead_request_set_tfm(subreq, ctx->geniv.child);
856e3f40 HX	226
	227	compl = req->base.complete;
	228	data = req->base.data;
	229
856e3f40 HX	230	aead_request_set_callback(subreq, req->base.flags, compl, data);
	231	aead_request_set_crypt(subreq, req->src, req->dst,
	232	req->cryptlen - ivsize, req->iv);
374d4ad1	233	aead_request_set_ad(subreq, req->assoclen + ivsize);
856e3f40 HX	234
856e3f40 HX	235	scatterwalk_map_and_copy(req->iv, req->src, req->assoclen, ivsize, 0);
856e3f40 HX	236
	237	return crypto_aead_decrypt(subreq);
	238	}
	239
0a270321 HX	240	static int seqiv_init(struct crypto_tfm *tfm)
	241	{
	242	struct crypto_ablkcipher *geniv = __crypto_ablkcipher_cast(tfm);
	243	struct seqiv_ctx *ctx = crypto_ablkcipher_ctx(geniv);
eeee12aa	244	int err;
0a270321 HX	245
	246	spin_lock_init(&ctx->lock);
	247
	248	tfm->crt_ablkcipher.reqsize = sizeof(struct ablkcipher_request);
	249
eeee12aa HX	250	err = 0;
	251	if (!crypto_get_default_rng()) {
	252	crypto_ablkcipher_crt(geniv)->givencrypt = seqiv_givencrypt;
	253	err = crypto_rng_get_bytes(crypto_default_rng, ctx->salt,
	254	crypto_ablkcipher_ivsize(geniv));
	255	crypto_put_default_rng();
	256	}
	257
	258	return err ?: skcipher_geniv_init(tfm);
0a270321 HX	259	}
0a270321 HX	260
5964f26c HX	261	static int seqiv_aead_init_common(struct crypto_aead *geniv,
5964f26c HX	262	unsigned int reqsize)
856e3f40	263	{
856e3f40 HX	264	struct seqiv_aead_ctx *ctx = crypto_aead_ctx(geniv);
	265	int err;
	266
661cfd0e	267	spin_lock_init(&ctx->geniv.lock);
856e3f40 HX	268
	269	crypto_aead_set_reqsize(geniv, sizeof(struct aead_request));
	270
eeee12aa HX	271	err = crypto_get_default_rng();
	272	if (err)
	273	goto out;
	274
b7dcfab4 HX	275	err = crypto_rng_get_bytes(crypto_default_rng, ctx->salt,
b7dcfab4 HX	276	crypto_aead_ivsize(geniv));
eeee12aa	277	crypto_put_default_rng();
b7dcfab4 HX	278	if (err)
	279	goto out;
	280
856e3f40 HX	281	ctx->null = crypto_get_default_null_skcipher();
	282	err = PTR_ERR(ctx->null);
	283	if (IS_ERR(ctx->null))
	284	goto out;
	285
5964f26c	286	err = aead_geniv_init(crypto_aead_tfm(geniv));
856e3f40 HX	287	if (err)
	288	goto drop_null;
	289
661cfd0e	290	ctx->geniv.child = geniv->child;
856e3f40 HX	291	geniv->child = geniv;
	292
	293	out:
	294	return err;
	295
	296	drop_null:
	297	crypto_put_default_null_skcipher();
	298	goto out;
	299	}
	300
5964f26c	301	static int seqiv_aead_init(struct crypto_aead *tfm)
856e3f40	302	{
dd04446e HX	303	return seqiv_aead_init_common(tfm, sizeof(struct aead_request));
dd04446e HX	304	}
856e3f40	305
5964f26c	306	static void seqiv_aead_exit(struct crypto_aead *tfm)
856e3f40	307	{
5964f26c	308	struct seqiv_aead_ctx *ctx = crypto_aead_ctx(tfm);
856e3f40	309
661cfd0e	310	crypto_free_aead(ctx->geniv.child);
856e3f40 HX	311	crypto_put_default_null_skcipher();
	312	}
	313
0677157b HX	314	static int seqiv_ablkcipher_create(struct crypto_template *tmpl,
0677157b HX	315	struct rtattr **tb)
0a270321 HX	316	{
0a270321 HX	317	struct crypto_instance *inst;
0677157b	318	int err;
0a270321	319
0677157b	320	inst = skcipher_geniv_alloc(tmpl, tb, 0, 0);
14df4d80	321
0a270321	322	if (IS_ERR(inst))
0677157b	323	return PTR_ERR(inst);
0a270321	324
0677157b HX	325	err = -EINVAL;
	326	if (inst->alg.cra_ablkcipher.ivsize < sizeof(u64))
	327	goto free_inst;
c0ecf891	328
0a270321 HX	329	inst->alg.cra_init = seqiv_init;
	330	inst->alg.cra_exit = skcipher_geniv_exit;
	331
0a270321	332	inst->alg.cra_ctxsize += inst->alg.cra_ablkcipher.ivsize;
856e3f40	333	inst->alg.cra_ctxsize += sizeof(struct seqiv_ctx);
0a270321	334
0677157b HX	335	inst->alg.cra_alignmask \|= __alignof__(u32) - 1;
	336
	337	err = crypto_register_instance(tmpl, inst);
	338	if (err)
	339	goto free_inst;
	340
0a270321	341	out:
0677157b HX	342	return err;
	343
	344	free_inst:
	345	skcipher_geniv_free(inst);
	346	goto out;
0a270321 HX	347	}
0a270321 HX	348
0677157b	349	static int seqiv_aead_create(struct crypto_template tmpl, struct rtattr *tb)
14df4d80	350	{
856e3f40 HX	351	struct aead_instance *inst;
	352	struct crypto_aead_spawn *spawn;
	353	struct aead_alg *alg;
0677157b	354	int err;
14df4d80	355
0677157b	356	inst = aead_geniv_alloc(tmpl, tb, 0, 0);
14df4d80 HX	357
14df4d80 HX	358	if (IS_ERR(inst))
0677157b HX	359	return PTR_ERR(inst);
	360
	361	inst->alg.base.cra_alignmask \|= __alignof__(u32) - 1;
14df4d80	362
661cfd0e HX	363	spawn = aead_instance_ctx(inst);
	364	alg = crypto_spawn_aead_alg(spawn);
	365
0677157b	366	err = -EINVAL;
dd04446e	367	if (inst->alg.ivsize != sizeof(u64))
0677157b	368	goto free_inst;
c0ecf891	369
b7dcfab4	370	inst->alg.encrypt = seqiv_aead_encrypt;
856e3f40	371	inst->alg.decrypt = seqiv_aead_decrypt;
14df4d80	372
5964f26c HX	373	inst->alg.init = seqiv_aead_init;
5964f26c HX	374	inst->alg.exit = seqiv_aead_exit;
856e3f40 HX	375
856e3f40 HX	376	inst->alg.base.cra_ctxsize = sizeof(struct seqiv_aead_ctx);
5964f26c	377	inst->alg.base.cra_ctxsize += inst->alg.ivsize;
856e3f40	378
0677157b HX	379	err = aead_register_instance(tmpl, inst);
	380	if (err)
	381	goto free_inst;
	382
14df4d80	383	out:
0677157b HX	384	return err;
	385
	386	free_inst:
	387	aead_geniv_free(inst);
	388	goto out;
14df4d80 HX	389	}
14df4d80 HX	390
0677157b	391	static int seqiv_create(struct crypto_template tmpl, struct rtattr *tb)
14df4d80 HX	392	{
14df4d80 HX	393	struct crypto_attr_type *algt;
14df4d80 HX	394	int err;
	395
	396	algt = crypto_get_attr_type(tb);
14df4d80	397	if (IS_ERR(algt))
0677157b	398	return PTR_ERR(algt);
14df4d80 HX	399
14df4d80 HX	400	if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & CRYPTO_ALG_TYPE_MASK)
0677157b	401	err = seqiv_ablkcipher_create(tmpl, tb);
14df4d80	402	else
0677157b	403	err = seqiv_aead_create(tmpl, tb);
14df4d80	404
0677157b	405	return err;
14df4d80 HX	406	}
	407
	408	static void seqiv_free(struct crypto_instance *inst)
	409	{
	410	if ((inst->alg.cra_flags ^ CRYPTO_ALG_TYPE_AEAD) & CRYPTO_ALG_TYPE_MASK)
	411	skcipher_geniv_free(inst);
	412	else
856e3f40	413	aead_geniv_free(aead_instance(inst));
14df4d80 HX	414	}
14df4d80 HX	415
0a270321 HX	416	static struct crypto_template seqiv_tmpl = {
0a270321 HX	417	.name = "seqiv",
0677157b	418	.create = seqiv_create,
14df4d80	419	.free = seqiv_free,
0a270321 HX	420	.module = THIS_MODULE,
	421	};
	422
	423	static int __init seqiv_module_init(void)
	424	{
8a2cd1c4	425	return crypto_register_template(&seqiv_tmpl);
0a270321 HX	426	}
	427
	428	static void __exit seqiv_module_exit(void)
	429	{
	430	crypto_unregister_template(&seqiv_tmpl);
	431	}
	432
	433	module_init(seqiv_module_init);
	434	module_exit(seqiv_module_exit);
	435
	436	MODULE_LICENSE("GPL");
	437	MODULE_DESCRIPTION("Sequence Number IV Generator");
4943ba16	438	MODULE_ALIAS_CRYPTO("seqiv");