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

/*
 * CTR: Counter mode
 *
 * (C) Copyright IBM Corp. 2007 - Joy Latten <latten@us.ibm.com>
 *
 * 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 <linux/err.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/random.h>
#include <linux/scatterlist.h>
#include <linux/slab.h>

struct ctr_instance_ctx {
	struct crypto_spawn alg;
	unsigned int noncesize;
	unsigned int ivsize;
	unsigned int countersize;
};

struct crypto_ctr_ctx {
	struct crypto_cipher *child;
	u8 *nonce;
};

static int crypto_ctr_setkey(struct crypto_tfm *parent, const u8 *key,
			     unsigned int keylen)
{
	struct crypto_ctr_ctx *ctx = crypto_tfm_ctx(parent);
	struct crypto_cipher *child = ctx->child;
	struct ctr_instance_ctx *ictx =
		crypto_instance_ctx(crypto_tfm_alg_instance(parent));
	unsigned int noncelen = ictx->noncesize;
	int err = 0;

	/* the nonce is stored in bytes at end of key */
	if (keylen < noncelen)
		return  -EINVAL;

	memcpy(ctx->nonce, key + (keylen - noncelen), noncelen);

	keylen -=  noncelen;

	crypto_cipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
	crypto_cipher_set_flags(child, crypto_tfm_get_flags(parent) &
				CRYPTO_TFM_REQ_MASK);
	err = crypto_cipher_setkey(child, key, keylen);
	crypto_tfm_set_flags(parent, crypto_cipher_get_flags(child) &
			     CRYPTO_TFM_RES_MASK);

	return err;
}

static void crypto_ctr_crypt_final(struct blkcipher_walk *walk,
				   struct crypto_cipher *tfm, u8 *ctrblk,
				   unsigned int countersize)
{
	unsigned int bsize = crypto_cipher_blocksize(tfm);
	u8 *keystream = ctrblk + bsize;
	u8 *src = walk->src.virt.addr;
	u8 *dst = walk->dst.virt.addr;
	unsigned int nbytes = walk->nbytes;

	crypto_cipher_encrypt_one(tfm, keystream, ctrblk);
	crypto_xor(keystream, src, nbytes);
	memcpy(dst, keystream, nbytes);
}

static int crypto_ctr_crypt_segment(struct blkcipher_walk *walk,
				    struct crypto_cipher *tfm, u8 *ctrblk,
				    unsigned int countersize)
{
	void (*fn)(struct crypto_tfm *, u8 *, const u8 *) =
		   crypto_cipher_alg(tfm)->cia_encrypt;
	unsigned int bsize = crypto_cipher_blocksize(tfm);
	u8 *src = walk->src.virt.addr;
	u8 *dst = walk->dst.virt.addr;
	unsigned int nbytes = walk->nbytes;

	do {
		/* create keystream */
		fn(crypto_cipher_tfm(tfm), dst, ctrblk);
		crypto_xor(dst, src, bsize);

		/* increment counter in counterblock */
		crypto_inc(ctrblk + bsize - countersize, countersize);

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

	return nbytes;
}

static int crypto_ctr_crypt_inplace(struct blkcipher_walk *walk,
				    struct crypto_cipher *tfm, u8 *ctrblk,
				    unsigned int countersize)
{
	void (*fn)(struct crypto_tfm *, u8 *, const u8 *) =
		   crypto_cipher_alg(tfm)->cia_encrypt;
	unsigned int bsize = crypto_cipher_blocksize(tfm);
	unsigned int nbytes = walk->nbytes;
	u8 *src = walk->src.virt.addr;
	u8 *keystream = ctrblk + bsize;

	do {
		/* create keystream */
		fn(crypto_cipher_tfm(tfm), keystream, ctrblk);
		crypto_xor(src, keystream, bsize);

		/* increment counter in counterblock */
		crypto_inc(ctrblk + bsize - countersize, countersize);

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

	return nbytes;
}

static int crypto_ctr_crypt(struct blkcipher_desc *desc,
			      struct scatterlist *dst, struct scatterlist *src,
			      unsigned int nbytes)
{
	struct blkcipher_walk walk;
	struct crypto_blkcipher *tfm = desc->tfm;
	struct crypto_ctr_ctx *ctx = crypto_blkcipher_ctx(tfm);
	struct crypto_cipher *child = ctx->child;
	unsigned int bsize = crypto_cipher_blocksize(child);
	struct ctr_instance_ctx *ictx =
		crypto_instance_ctx(crypto_tfm_alg_instance(&tfm->base));
	unsigned long alignmask = crypto_cipher_alignmask(child) |
				  (__alignof__(u32) - 1);
	u8 cblk[bsize * 2 + alignmask];
	u8 *counterblk = (u8 *)ALIGN((unsigned long)cblk, alignmask + 1);
	int err;

	blkcipher_walk_init(&walk, dst, src, nbytes);
	err = blkcipher_walk_virt_block(desc, &walk, bsize);

	/* set up counter block */
	memset(counterblk, 0 , bsize);
	memcpy(counterblk, ctx->nonce, ictx->noncesize);
	memcpy(counterblk + ictx->noncesize, walk.iv, ictx->ivsize);

	/* initialize counter portion of counter block */
	crypto_inc(counterblk + bsize - ictx->countersize, ictx->countersize);

	while (walk.nbytes >= bsize) {
		if (walk.src.virt.addr == walk.dst.virt.addr)
			nbytes = crypto_ctr_crypt_inplace(&walk, child,
							  counterblk,
							  ictx->countersize);
		else
			nbytes = crypto_ctr_crypt_segment(&walk, child,
							  counterblk,
							  ictx->countersize);

		err = blkcipher_walk_done(desc, &walk, nbytes);
	}

	if (walk.nbytes) {
		crypto_ctr_crypt_final(&walk, child, counterblk,
				       ictx->countersize);
		err = blkcipher_walk_done(desc, &walk, 0);
	}

	return err;
}

static int crypto_ctr_init_tfm(struct crypto_tfm *tfm)
{
	struct crypto_instance *inst = (void *)tfm->__crt_alg;
	struct ctr_instance_ctx *ictx = crypto_instance_ctx(inst);
	struct crypto_ctr_ctx *ctx = crypto_tfm_ctx(tfm);
	struct crypto_cipher *cipher;

	ctx->nonce = kzalloc(ictx->noncesize, GFP_KERNEL);
	if (!ctx->nonce)
		return -ENOMEM;

	cipher = crypto_spawn_cipher(&ictx->alg);
	if (IS_ERR(cipher))
		return PTR_ERR(cipher);

	ctx->child = cipher;

	return 0;
}

static void crypto_ctr_exit_tfm(struct crypto_tfm *tfm)
{
	struct crypto_ctr_ctx *ctx = crypto_tfm_ctx(tfm);

	kfree(ctx->nonce);
	crypto_free_cipher(ctx->child);
}

static struct crypto_instance *crypto_ctr_alloc(struct rtattr **tb)
{
	struct crypto_instance *inst;
	struct crypto_alg *alg;
	struct ctr_instance_ctx *ictx;
	unsigned int noncesize;
	unsigned int ivsize;
	unsigned int countersize;
	int err;

	err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_BLKCIPHER);
	if (err)
		return ERR_PTR(err);

	alg = crypto_attr_alg(tb[1], CRYPTO_ALG_TYPE_CIPHER,
				  CRYPTO_ALG_TYPE_MASK);
	if (IS_ERR(alg))
		return ERR_PTR(PTR_ERR(alg));

	err = crypto_attr_u32(tb[2], &noncesize);
	if (err)
		goto out_put_alg;

	err = crypto_attr_u32(tb[3], &ivsize);
	if (err)
		goto out_put_alg;

	err = crypto_attr_u32(tb[4], &countersize);
	if (err)
		goto out_put_alg;

	/* verify size of nonce + iv + counter
	 * counter must be >= 4 bytes.
	 */
	err = -EINVAL;
	if (((noncesize + ivsize + countersize) < alg->cra_blocksize) ||
	    ((noncesize + ivsize) > alg->cra_blocksize) ||
	    (countersize > alg->cra_blocksize) || (countersize < 4))
		goto out_put_alg;

	/* If this is false we'd fail the alignment of crypto_inc. */
	if ((alg->cra_blocksize - countersize) % 4)
		goto out_put_alg;

	inst = kzalloc(sizeof(*inst) + sizeof(*ictx), GFP_KERNEL);
	err = -ENOMEM;
	if (!inst)
		goto out_put_alg;

	err = -ENAMETOOLONG;
	if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
		     "ctr(%s,%u,%u,%u)", alg->cra_name, noncesize,
		     ivsize, countersize) >= CRYPTO_MAX_ALG_NAME) {
		goto err_free_inst;
	}

	if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
		     "ctr(%s,%u,%u,%u)", alg->cra_driver_name, noncesize,
		     ivsize, countersize) >= CRYPTO_MAX_ALG_NAME) {
		goto err_free_inst;
	}

	ictx = crypto_instance_ctx(inst);
	ictx->noncesize = noncesize;
	ictx->ivsize = ivsize;
	ictx->countersize = countersize;

	err = crypto_init_spawn(&ictx->alg, alg, inst,
		CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
	if (err)
		goto err_free_inst;

	err = 0;
	inst->alg.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER;
	inst->alg.cra_priority = alg->cra_priority;
	inst->alg.cra_blocksize = 1;
	inst->alg.cra_alignmask = alg->cra_alignmask | (__alignof__(u32) - 1);
	inst->alg.cra_type = &crypto_blkcipher_type;

	inst->alg.cra_blkcipher.ivsize = ivsize;
	inst->alg.cra_blkcipher.min_keysize = alg->cra_cipher.cia_min_keysize
					      + noncesize;
	inst->alg.cra_blkcipher.max_keysize = alg->cra_cipher.cia_max_keysize
					      + noncesize;

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

	inst->alg.cra_init = crypto_ctr_init_tfm;
	inst->alg.cra_exit = crypto_ctr_exit_tfm;

	inst->alg.cra_blkcipher.setkey = crypto_ctr_setkey;
	inst->alg.cra_blkcipher.encrypt = crypto_ctr_crypt;
	inst->alg.cra_blkcipher.decrypt = crypto_ctr_crypt;

err_free_inst:
	if (err)
		kfree(inst);

out_put_alg:
	crypto_mod_put(alg);

	if (err)
		inst = ERR_PTR(err);

	return inst;
}

static void crypto_ctr_free(struct crypto_instance *inst)
{
	struct ctr_instance_ctx *ictx = crypto_instance_ctx(inst);

	crypto_drop_spawn(&ictx->alg);
	kfree(inst);
}

static struct crypto_template crypto_ctr_tmpl = {
	.name = "ctr",
	.alloc = crypto_ctr_alloc,
	.free = crypto_ctr_free,
	.module = THIS_MODULE,
};

static int __init crypto_ctr_module_init(void)
{
	return crypto_register_template(&crypto_ctr_tmpl);
}

static void __exit crypto_ctr_module_exit(void)
{
	crypto_unregister_template(&crypto_ctr_tmpl);
}

module_init(crypto_ctr_module_init);
module_exit(crypto_ctr_module_exit);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("CTR Counter block mode");
Commit	Line	Data
23e353c8 JL	1	/*
	2	* CTR: Counter mode
	3	*
	4	* (C) Copyright IBM Corp. 2007 - Joy Latten <latten@us.ibm.com>
	5	*
	6	* This program is free software; you can redistribute it and/or modify it
	7	* under the terms of the GNU General Public License as published by the Free
	8	* Software Foundation; either version 2 of the License, or (at your option)
	9	* any later version.
	10	*
	11	*/
	12
	13	#include <crypto/algapi.h>
	14	#include <linux/err.h>
	15	#include <linux/init.h>
	16	#include <linux/kernel.h>
	17	#include <linux/module.h>
	18	#include <linux/random.h>
	19	#include <linux/scatterlist.h>
	20	#include <linux/slab.h>
	21
	22	struct ctr_instance_ctx {
	23	struct crypto_spawn alg;
	24	unsigned int noncesize;
	25	unsigned int ivsize;
41fdab3d	26	unsigned int countersize;
23e353c8 JL	27	};
	28
	29	struct crypto_ctr_ctx {
	30	struct crypto_cipher *child;
	31	u8 *nonce;
	32	};
	33
23e353c8 JL	34	static int crypto_ctr_setkey(struct crypto_tfm parent, const u8 key,
	35	unsigned int keylen)
	36	{
	37	struct crypto_ctr_ctx *ctx = crypto_tfm_ctx(parent);
	38	struct crypto_cipher *child = ctx->child;
	39	struct ctr_instance_ctx *ictx =
	40	crypto_instance_ctx(crypto_tfm_alg_instance(parent));
	41	unsigned int noncelen = ictx->noncesize;
	42	int err = 0;
	43
	44	/* the nonce is stored in bytes at end of key */
	45	if (keylen < noncelen)
	46	return -EINVAL;
	47
	48	memcpy(ctx->nonce, key + (keylen - noncelen), noncelen);
	49
	50	keylen -= noncelen;
	51
	52	crypto_cipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
	53	crypto_cipher_set_flags(child, crypto_tfm_get_flags(parent) &
	54	CRYPTO_TFM_REQ_MASK);
	55	err = crypto_cipher_setkey(child, key, keylen);
	56	crypto_tfm_set_flags(parent, crypto_cipher_get_flags(child) &
	57	CRYPTO_TFM_RES_MASK);
	58
	59	return err;
	60	}
	61
0971eb0d HX	62	static void crypto_ctr_crypt_final(struct blkcipher_walk *walk,
	63	struct crypto_cipher tfm, u8 ctrblk,
	64	unsigned int countersize)
	65	{
	66	unsigned int bsize = crypto_cipher_blocksize(tfm);
	67	u8 *keystream = ctrblk + bsize;
	68	u8 *src = walk->src.virt.addr;
	69	u8 *dst = walk->dst.virt.addr;
	70	unsigned int nbytes = walk->nbytes;
	71
	72	crypto_cipher_encrypt_one(tfm, keystream, ctrblk);
	73	crypto_xor(keystream, src, nbytes);
	74	memcpy(dst, keystream, nbytes);
	75	}
	76
23e353c8 JL	77	static int crypto_ctr_crypt_segment(struct blkcipher_walk *walk,
	78	struct crypto_cipher tfm, u8 ctrblk,
	79	unsigned int countersize)
	80	{
	81	void (fn)(struct crypto_tfm , u8 , const u8 ) =
	82	crypto_cipher_alg(tfm)->cia_encrypt;
	83	unsigned int bsize = crypto_cipher_blocksize(tfm);
23e353c8 JL	84	u8 *src = walk->src.virt.addr;
	85	u8 *dst = walk->dst.virt.addr;
	86	unsigned int nbytes = walk->nbytes;
	87
	88	do {
	89	/* create keystream */
0971eb0d HX	90	fn(crypto_cipher_tfm(tfm), dst, ctrblk);
0971eb0d HX	91	crypto_xor(dst, src, bsize);
23e353c8 JL	92
23e353c8 JL	93	/* increment counter in counterblock */
3f8214ea	94	crypto_inc(ctrblk + bsize - countersize, countersize);
23e353c8	95
23e353c8 JL	96	src += bsize;
23e353c8 JL	97	dst += bsize;
0971eb0d	98	} while ((nbytes -= bsize) >= bsize);
23e353c8	99
0971eb0d	100	return nbytes;
23e353c8 JL	101	}
	102
	103	static int crypto_ctr_crypt_inplace(struct blkcipher_walk *walk,
	104	struct crypto_cipher tfm, u8 ctrblk,
	105	unsigned int countersize)
	106	{
	107	void (fn)(struct crypto_tfm , u8 , const u8 ) =
	108	crypto_cipher_alg(tfm)->cia_encrypt;
	109	unsigned int bsize = crypto_cipher_blocksize(tfm);
23e353c8 JL	110	unsigned int nbytes = walk->nbytes;
23e353c8 JL	111	u8 *src = walk->src.virt.addr;
0971eb0d	112	u8 *keystream = ctrblk + bsize;
23e353c8 JL	113
	114	do {
	115	/* create keystream */
	116	fn(crypto_cipher_tfm(tfm), keystream, ctrblk);
0971eb0d	117	crypto_xor(src, keystream, bsize);
23e353c8 JL	118
23e353c8 JL	119	/* increment counter in counterblock */
3f8214ea	120	crypto_inc(ctrblk + bsize - countersize, countersize);
23e353c8	121
23e353c8	122	src += bsize;
0971eb0d	123	} while ((nbytes -= bsize) >= bsize);
23e353c8	124
0971eb0d	125	return nbytes;
23e353c8 JL	126	}
	127
	128	static int crypto_ctr_crypt(struct blkcipher_desc *desc,
	129	struct scatterlist dst, struct scatterlist src,
	130	unsigned int nbytes)
	131	{
	132	struct blkcipher_walk walk;
	133	struct crypto_blkcipher *tfm = desc->tfm;
	134	struct crypto_ctr_ctx *ctx = crypto_blkcipher_ctx(tfm);
	135	struct crypto_cipher *child = ctx->child;
	136	unsigned int bsize = crypto_cipher_blocksize(child);
	137	struct ctr_instance_ctx *ictx =
	138	crypto_instance_ctx(crypto_tfm_alg_instance(&tfm->base));
3f8214ea HX	139	unsigned long alignmask = crypto_cipher_alignmask(child) \|
3f8214ea HX	140	(__alignof__(u32) - 1);
0971eb0d	141	u8 cblk[bsize * 2 + alignmask];
23e353c8	142	u8 counterblk = (u8 )ALIGN((unsigned long)cblk, alignmask + 1);
23e353c8 JL	143	int err;
	144
	145	blkcipher_walk_init(&walk, dst, src, nbytes);
	146	err = blkcipher_walk_virt_block(desc, &walk, bsize);
	147
	148	/* set up counter block */
	149	memset(counterblk, 0 , bsize);
	150	memcpy(counterblk, ctx->nonce, ictx->noncesize);
	151	memcpy(counterblk + ictx->noncesize, walk.iv, ictx->ivsize);
	152
	153	/* initialize counter portion of counter block */
3f8214ea	154	crypto_inc(counterblk + bsize - ictx->countersize, ictx->countersize);
23e353c8	155
0971eb0d	156	while (walk.nbytes >= bsize) {
23e353c8 JL	157	if (walk.src.virt.addr == walk.dst.virt.addr)
	158	nbytes = crypto_ctr_crypt_inplace(&walk, child,
	159	counterblk,
41fdab3d	160	ictx->countersize);
23e353c8 JL	161	else
	162	nbytes = crypto_ctr_crypt_segment(&walk, child,
	163	counterblk,
41fdab3d	164	ictx->countersize);
23e353c8 JL	165
	166	err = blkcipher_walk_done(desc, &walk, nbytes);
	167	}
0971eb0d HX	168
	169	if (walk.nbytes) {
	170	crypto_ctr_crypt_final(&walk, child, counterblk,
	171	ictx->countersize);
	172	err = blkcipher_walk_done(desc, &walk, 0);
	173	}
	174
23e353c8 JL	175	return err;
	176	}
	177
	178	static int crypto_ctr_init_tfm(struct crypto_tfm *tfm)
	179	{
	180	struct crypto_instance inst = (void )tfm->__crt_alg;
	181	struct ctr_instance_ctx *ictx = crypto_instance_ctx(inst);
	182	struct crypto_ctr_ctx *ctx = crypto_tfm_ctx(tfm);
	183	struct crypto_cipher *cipher;
	184
	185	ctx->nonce = kzalloc(ictx->noncesize, GFP_KERNEL);
	186	if (!ctx->nonce)
	187	return -ENOMEM;
	188
	189	cipher = crypto_spawn_cipher(&ictx->alg);
	190	if (IS_ERR(cipher))
	191	return PTR_ERR(cipher);
	192
	193	ctx->child = cipher;
	194
	195	return 0;
	196	}
	197
	198	static void crypto_ctr_exit_tfm(struct crypto_tfm *tfm)
	199	{
	200	struct crypto_ctr_ctx *ctx = crypto_tfm_ctx(tfm);
	201
	202	kfree(ctx->nonce);
	203	crypto_free_cipher(ctx->child);
	204	}
	205
	206	static struct crypto_instance crypto_ctr_alloc(struct rtattr *tb)
	207	{
	208	struct crypto_instance *inst;
	209	struct crypto_alg *alg;
	210	struct ctr_instance_ctx *ictx;
	211	unsigned int noncesize;
	212	unsigned int ivsize;
41fdab3d	213	unsigned int countersize;
23e353c8 JL	214	int err;
	215
	216	err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_BLKCIPHER);
	217	if (err)
	218	return ERR_PTR(err);
	219
	220	alg = crypto_attr_alg(tb[1], CRYPTO_ALG_TYPE_CIPHER,
	221	CRYPTO_ALG_TYPE_MASK);
	222	if (IS_ERR(alg))
	223	return ERR_PTR(PTR_ERR(alg));
	224
	225	err = crypto_attr_u32(tb[2], &noncesize);
	226	if (err)
	227	goto out_put_alg;
	228
	229	err = crypto_attr_u32(tb[3], &ivsize);
	230	if (err)
	231	goto out_put_alg;
	232
41fdab3d JL	233	err = crypto_attr_u32(tb[4], &countersize);
	234	if (err)
	235	goto out_put_alg;
	236
	237	/* verify size of nonce + iv + counter
	238	* counter must be >= 4 bytes.
	239	*/
23e353c8	240	err = -EINVAL;
41fdab3d JL	241	if (((noncesize + ivsize + countersize) < alg->cra_blocksize) \|\|
	242	((noncesize + ivsize) > alg->cra_blocksize) \|\|
	243	(countersize > alg->cra_blocksize) \|\| (countersize < 4))
23e353c8 JL	244	goto out_put_alg;
23e353c8 JL	245
3f8214ea HX	246	/* If this is false we'd fail the alignment of crypto_inc. */
	247	if ((alg->cra_blocksize - countersize) % 4)
	248	goto out_put_alg;
	249
23e353c8 JL	250	inst = kzalloc(sizeof(inst) + sizeof(ictx), GFP_KERNEL);
	251	err = -ENOMEM;
	252	if (!inst)
	253	goto out_put_alg;
	254
	255	err = -ENAMETOOLONG;
	256	if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
41fdab3d JL	257	"ctr(%s,%u,%u,%u)", alg->cra_name, noncesize,
41fdab3d JL	258	ivsize, countersize) >= CRYPTO_MAX_ALG_NAME) {
23e353c8 JL	259	goto err_free_inst;
	260	}
	261
	262	if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
41fdab3d JL	263	"ctr(%s,%u,%u,%u)", alg->cra_driver_name, noncesize,
41fdab3d JL	264	ivsize, countersize) >= CRYPTO_MAX_ALG_NAME) {
23e353c8 JL	265	goto err_free_inst;
	266	}
	267
	268	ictx = crypto_instance_ctx(inst);
	269	ictx->noncesize = noncesize;
	270	ictx->ivsize = ivsize;
41fdab3d	271	ictx->countersize = countersize;
23e353c8 JL	272
	273	err = crypto_init_spawn(&ictx->alg, alg, inst,
	274	CRYPTO_ALG_TYPE_MASK \| CRYPTO_ALG_ASYNC);
	275	if (err)
	276	goto err_free_inst;
	277
	278	err = 0;
	279	inst->alg.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER;
	280	inst->alg.cra_priority = alg->cra_priority;
	281	inst->alg.cra_blocksize = 1;
0971eb0d	282	inst->alg.cra_alignmask = alg->cra_alignmask \| (__alignof__(u32) - 1);
23e353c8 JL	283	inst->alg.cra_type = &crypto_blkcipher_type;
	284
	285	inst->alg.cra_blkcipher.ivsize = ivsize;
	286	inst->alg.cra_blkcipher.min_keysize = alg->cra_cipher.cia_min_keysize
	287	+ noncesize;
	288	inst->alg.cra_blkcipher.max_keysize = alg->cra_cipher.cia_max_keysize
	289	+ noncesize;
	290
	291	inst->alg.cra_ctxsize = sizeof(struct crypto_ctr_ctx);
	292
	293	inst->alg.cra_init = crypto_ctr_init_tfm;
	294	inst->alg.cra_exit = crypto_ctr_exit_tfm;
	295
	296	inst->alg.cra_blkcipher.setkey = crypto_ctr_setkey;
	297	inst->alg.cra_blkcipher.encrypt = crypto_ctr_crypt;
	298	inst->alg.cra_blkcipher.decrypt = crypto_ctr_crypt;
	299
	300	err_free_inst:
	301	if (err)
	302	kfree(inst);
	303
	304	out_put_alg:
	305	crypto_mod_put(alg);
	306
	307	if (err)
	308	inst = ERR_PTR(err);
	309
	310	return inst;
	311	}
	312
	313	static void crypto_ctr_free(struct crypto_instance *inst)
	314	{
	315	struct ctr_instance_ctx *ictx = crypto_instance_ctx(inst);
	316
	317	crypto_drop_spawn(&ictx->alg);
	318	kfree(inst);
	319	}
	320
	321	static struct crypto_template crypto_ctr_tmpl = {
	322	.name = "ctr",
	323	.alloc = crypto_ctr_alloc,
	324	.free = crypto_ctr_free,
	325	.module = THIS_MODULE,
	326	};
	327
	328	static int __init crypto_ctr_module_init(void)
	329	{
	330	return crypto_register_template(&crypto_ctr_tmpl);
	331	}
	332
	333	static void __exit crypto_ctr_module_exit(void)
	334	{
	335	crypto_unregister_template(&crypto_ctr_tmpl);
	336	}
	337
	338	module_init(crypto_ctr_module_init);
	339	module_exit(crypto_ctr_module_exit);
	340
	341	MODULE_LICENSE("GPL");
	342	MODULE_DESCRIPTION("CTR Counter block mode");