[mirror_ubuntu-artful-kernel.git] / crypto / ablkcipher.c

/*
 * Asynchronous block chaining cipher operations.
 * 
 * This is the asynchronous version of blkcipher.c indicating completion
 * via a callback.
 *
 * 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/rtnetlink.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/seq_file.h>

#include "internal.h"

static int setkey_unaligned(struct crypto_ablkcipher *tfm, const u8 *key,
			    unsigned int keylen)
{
	struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm);
	unsigned long alignmask = crypto_ablkcipher_alignmask(tfm);
	int ret;
	u8 *buffer, *alignbuffer;
	unsigned long absize;

	absize = keylen + alignmask;
	buffer = kmalloc(absize, GFP_ATOMIC);
	if (!buffer)
		return -ENOMEM;

	alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
	memcpy(alignbuffer, key, keylen);
	ret = cipher->setkey(tfm, alignbuffer, keylen);
	memset(alignbuffer, 0, keylen);
	kfree(buffer);
	return ret;
}

static int setkey(struct crypto_ablkcipher *tfm, const u8 *key,
		  unsigned int keylen)
{
	struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm);
	unsigned long alignmask = crypto_ablkcipher_alignmask(tfm);

	if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) {
		crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
		return -EINVAL;
	}

	if ((unsigned long)key & alignmask)
		return setkey_unaligned(tfm, key, keylen);

	return cipher->setkey(tfm, key, keylen);
}

static unsigned int crypto_ablkcipher_ctxsize(struct crypto_alg *alg, u32 type,
					      u32 mask)
{
	return alg->cra_ctxsize;
}

int skcipher_null_givencrypt(struct skcipher_givcrypt_request *req)
{
	return crypto_ablkcipher_encrypt(&req->creq);
}

int skcipher_null_givdecrypt(struct skcipher_givcrypt_request *req)
{
	return crypto_ablkcipher_decrypt(&req->creq);
}

static int crypto_init_ablkcipher_ops(struct crypto_tfm *tfm, u32 type,
				      u32 mask)
{
	struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher;
	struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher;

	if (alg->ivsize > PAGE_SIZE / 8)
		return -EINVAL;

	crt->setkey = setkey;
	crt->encrypt = alg->encrypt;
	crt->decrypt = alg->decrypt;
	if (!alg->ivsize) {
		crt->givencrypt = skcipher_null_givencrypt;
		crt->givdecrypt = skcipher_null_givdecrypt;
	}
	crt->base = __crypto_ablkcipher_cast(tfm);
	crt->ivsize = alg->ivsize;

	return 0;
}

static void crypto_ablkcipher_show(struct seq_file *m, struct crypto_alg *alg)
	__attribute__ ((unused));
static void crypto_ablkcipher_show(struct seq_file *m, struct crypto_alg *alg)
{
	struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher;

	seq_printf(m, "type         : ablkcipher\n");
	seq_printf(m, "async        : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
					     "yes" : "no");
	seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
	seq_printf(m, "min keysize  : %u\n", ablkcipher->min_keysize);
	seq_printf(m, "max keysize  : %u\n", ablkcipher->max_keysize);
	seq_printf(m, "ivsize       : %u\n", ablkcipher->ivsize);
	seq_printf(m, "geniv        : %s\n", ablkcipher->geniv ?: "<default>");
}

const struct crypto_type crypto_ablkcipher_type = {
	.ctxsize = crypto_ablkcipher_ctxsize,
	.init = crypto_init_ablkcipher_ops,
#ifdef CONFIG_PROC_FS
	.show = crypto_ablkcipher_show,
#endif
};
EXPORT_SYMBOL_GPL(crypto_ablkcipher_type);

static int no_givdecrypt(struct skcipher_givcrypt_request *req)
{
	return -ENOSYS;
}

static int crypto_init_givcipher_ops(struct crypto_tfm *tfm, u32 type,
				      u32 mask)
{
	struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher;
	struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher;

	if (alg->ivsize > PAGE_SIZE / 8)
		return -EINVAL;

	crt->setkey = tfm->__crt_alg->cra_flags & CRYPTO_ALG_GENIV ?
		      alg->setkey : setkey;
	crt->encrypt = alg->encrypt;
	crt->decrypt = alg->decrypt;
	crt->givencrypt = alg->givencrypt;
	crt->givdecrypt = alg->givdecrypt ?: no_givdecrypt;
	crt->base = __crypto_ablkcipher_cast(tfm);
	crt->ivsize = alg->ivsize;

	return 0;
}

static void crypto_givcipher_show(struct seq_file *m, struct crypto_alg *alg)
	__attribute__ ((unused));
static void crypto_givcipher_show(struct seq_file *m, struct crypto_alg *alg)
{
	struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher;

	seq_printf(m, "type         : givcipher\n");
	seq_printf(m, "async        : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
					     "yes" : "no");
	seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
	seq_printf(m, "min keysize  : %u\n", ablkcipher->min_keysize);
	seq_printf(m, "max keysize  : %u\n", ablkcipher->max_keysize);
	seq_printf(m, "ivsize       : %u\n", ablkcipher->ivsize);
	seq_printf(m, "geniv        : %s\n", ablkcipher->geniv ?: "<built-in>");
}

const struct crypto_type crypto_givcipher_type = {
	.ctxsize = crypto_ablkcipher_ctxsize,
	.init = crypto_init_givcipher_ops,
#ifdef CONFIG_PROC_FS
	.show = crypto_givcipher_show,
#endif
};
EXPORT_SYMBOL_GPL(crypto_givcipher_type);

const char *crypto_default_geniv(const struct crypto_alg *alg)
{
	return alg->cra_flags & CRYPTO_ALG_ASYNC ? "eseqiv" : "chainiv";
}

static int crypto_givcipher_default(struct crypto_alg *alg, u32 type, u32 mask)
{
	struct rtattr *tb[3];
	struct {
		struct rtattr attr;
		struct crypto_attr_type data;
	} ptype;
	struct {
		struct rtattr attr;
		struct crypto_attr_alg data;
	} palg;
	struct crypto_template *tmpl;
	struct crypto_instance *inst;
	struct crypto_alg *larval;
	const char *geniv;
	int err;

	larval = crypto_larval_lookup(alg->cra_driver_name,
				      CRYPTO_ALG_TYPE_GIVCIPHER,
				      CRYPTO_ALG_TYPE_MASK);
	err = PTR_ERR(larval);
	if (IS_ERR(larval))
		goto out;

	err = -EAGAIN;
	if (!crypto_is_larval(larval))
		goto drop_larval;

	ptype.attr.rta_len = sizeof(ptype);
	ptype.attr.rta_type = CRYPTOA_TYPE;
	ptype.data.type = type | CRYPTO_ALG_GENIV;
	/* GENIV tells the template that we're making a default geniv. */
	ptype.data.mask = mask | CRYPTO_ALG_GENIV;
	tb[0] = &ptype.attr;

	palg.attr.rta_len = sizeof(palg);
	palg.attr.rta_type = CRYPTOA_ALG;
	/* Must use the exact name to locate ourselves. */
	memcpy(palg.data.name, alg->cra_driver_name, CRYPTO_MAX_ALG_NAME);
	tb[1] = &palg.attr;

	tb[2] = NULL;

	if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
	    CRYPTO_ALG_TYPE_BLKCIPHER)
		geniv = alg->cra_blkcipher.geniv;
	else
		geniv = alg->cra_ablkcipher.geniv;

	if (!geniv)
		geniv = crypto_default_geniv(alg);

	tmpl = crypto_lookup_template(geniv);
	err = -ENOENT;
	if (!tmpl)
		goto kill_larval;

	inst = tmpl->alloc(tb);
	err = PTR_ERR(inst);
	if (IS_ERR(inst))
		goto put_tmpl;

	if ((err = crypto_register_instance(tmpl, inst))) {
		tmpl->free(inst);
		goto put_tmpl;
	}

	/* Redo the lookup to use the instance we just registered. */
	err = -EAGAIN;

put_tmpl:
	crypto_tmpl_put(tmpl);
kill_larval:
	crypto_larval_kill(larval);
drop_larval:
	crypto_mod_put(larval);
out:
	crypto_mod_put(alg);
	return err;
}

static struct crypto_alg *crypto_lookup_skcipher(const char *name, u32 type,
						 u32 mask)
{
	struct crypto_alg *alg;

	alg = crypto_alg_mod_lookup(name, type, mask);
	if (IS_ERR(alg))
		return alg;

	if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
	    CRYPTO_ALG_TYPE_GIVCIPHER)
		return alg;

	if (!((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
	      CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize :
					  alg->cra_ablkcipher.ivsize))
		return alg;

	return ERR_PTR(crypto_givcipher_default(alg, type, mask));
}

int crypto_grab_skcipher(struct crypto_skcipher_spawn *spawn, const char *name,
			 u32 type, u32 mask)
{
	struct crypto_alg *alg;
	int err;

	type = crypto_skcipher_type(type);
	mask = crypto_skcipher_mask(mask);

	alg = crypto_lookup_skcipher(name, type, mask);
	if (IS_ERR(alg))
		return PTR_ERR(alg);

	err = crypto_init_spawn(&spawn->base, alg, spawn->base.inst, mask);
	crypto_mod_put(alg);
	return err;
}
EXPORT_SYMBOL_GPL(crypto_grab_skcipher);

struct crypto_ablkcipher *crypto_alloc_ablkcipher(const char *alg_name,
						  u32 type, u32 mask)
{
	struct crypto_tfm *tfm;
	int err;

	type = crypto_skcipher_type(type);
	mask = crypto_skcipher_mask(mask);

	for (;;) {
		struct crypto_alg *alg;

		alg = crypto_lookup_skcipher(alg_name, type, mask);
		if (IS_ERR(alg)) {
			err = PTR_ERR(alg);
			goto err;
		}

		tfm = __crypto_alloc_tfm(alg, type, mask);
		if (!IS_ERR(tfm))
			return __crypto_ablkcipher_cast(tfm);

		crypto_mod_put(alg);
		err = PTR_ERR(tfm);

err:
		if (err != -EAGAIN)
			break;
		if (signal_pending(current)) {
			err = -EINTR;
			break;
		}
	}

	return ERR_PTR(err);
}
EXPORT_SYMBOL_GPL(crypto_alloc_ablkcipher);
Commit	Line	Data
b5b7f088 HX	1	/*
	2	* Asynchronous block chaining cipher operations.
	3	*
	4	* This is the asynchronous version of blkcipher.c indicating completion
	5	* via a callback.
	6	*
	7	* Copyright (c) 2006 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
378f4f51 HX	16	#include <crypto/internal/skcipher.h>
378f4f51 HX	17	#include <linux/err.h>
b5b7f088	18	#include <linux/init.h>
791b4d5f	19	#include <linux/kernel.h>
b5b7f088	20	#include <linux/module.h>
b9c55aa4 HX	21	#include <linux/rtnetlink.h>
b9c55aa4 HX	22	#include <linux/sched.h>
791b4d5f	23	#include <linux/slab.h>
b5b7f088 HX	24	#include <linux/seq_file.h>
b5b7f088 HX	25
378f4f51 HX	26	#include "internal.h"
378f4f51 HX	27
791b4d5f HX	28	static int setkey_unaligned(struct crypto_ablkcipher tfm, const u8 key,
791b4d5f HX	29	unsigned int keylen)
ca7c3938 SS	30	{
	31	struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm);
	32	unsigned long alignmask = crypto_ablkcipher_alignmask(tfm);
	33	int ret;
	34	u8 buffer, alignbuffer;
	35	unsigned long absize;
	36
	37	absize = keylen + alignmask;
	38	buffer = kmalloc(absize, GFP_ATOMIC);
	39	if (!buffer)
	40	return -ENOMEM;
	41
	42	alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
	43	memcpy(alignbuffer, key, keylen);
	44	ret = cipher->setkey(tfm, alignbuffer, keylen);
06817176	45	memset(alignbuffer, 0, keylen);
ca7c3938 SS	46	kfree(buffer);
	47	return ret;
	48	}
	49
b5b7f088 HX	50	static int setkey(struct crypto_ablkcipher tfm, const u8 key,
	51	unsigned int keylen)
	52	{
	53	struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm);
ca7c3938	54	unsigned long alignmask = crypto_ablkcipher_alignmask(tfm);
b5b7f088 HX	55
	56	if (keylen < cipher->min_keysize \|\| keylen > cipher->max_keysize) {
	57	crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
	58	return -EINVAL;
	59	}
	60
ca7c3938 SS	61	if ((unsigned long)key & alignmask)
	62	return setkey_unaligned(tfm, key, keylen);
	63
b5b7f088 HX	64	return cipher->setkey(tfm, key, keylen);
	65	}
	66
	67	static unsigned int crypto_ablkcipher_ctxsize(struct crypto_alg *alg, u32 type,
	68	u32 mask)
	69	{
	70	return alg->cra_ctxsize;
	71	}
	72
b9c55aa4 HX	73	int skcipher_null_givencrypt(struct skcipher_givcrypt_request *req)
	74	{
	75	return crypto_ablkcipher_encrypt(&req->creq);
	76	}
	77
	78	int skcipher_null_givdecrypt(struct skcipher_givcrypt_request *req)
	79	{
	80	return crypto_ablkcipher_decrypt(&req->creq);
	81	}
	82
b5b7f088 HX	83	static int crypto_init_ablkcipher_ops(struct crypto_tfm *tfm, u32 type,
	84	u32 mask)
	85	{
	86	struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher;
	87	struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher;
	88
	89	if (alg->ivsize > PAGE_SIZE / 8)
	90	return -EINVAL;
	91
	92	crt->setkey = setkey;
	93	crt->encrypt = alg->encrypt;
	94	crt->decrypt = alg->decrypt;
b9c55aa4 HX	95	if (!alg->ivsize) {
	96	crt->givencrypt = skcipher_null_givencrypt;
	97	crt->givdecrypt = skcipher_null_givdecrypt;
	98	}
ecfc4329	99	crt->base = __crypto_ablkcipher_cast(tfm);
b5b7f088 HX	100	crt->ivsize = alg->ivsize;
	101
	102	return 0;
	103	}
	104
	105	static void crypto_ablkcipher_show(struct seq_file m, struct crypto_alg alg)
	106	__attribute__ ((unused));
	107	static void crypto_ablkcipher_show(struct seq_file m, struct crypto_alg alg)
	108	{
	109	struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher;
	110
	111	seq_printf(m, "type : ablkcipher\n");
189ed66e HX	112	seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
189ed66e HX	113	"yes" : "no");
b5b7f088 HX	114	seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
	115	seq_printf(m, "min keysize : %u\n", ablkcipher->min_keysize);
	116	seq_printf(m, "max keysize : %u\n", ablkcipher->max_keysize);
	117	seq_printf(m, "ivsize : %u\n", ablkcipher->ivsize);
23508e11	118	seq_printf(m, "geniv : %s\n", ablkcipher->geniv ?: "<default>");
b5b7f088 HX	119	}
	120
	121	const struct crypto_type crypto_ablkcipher_type = {
	122	.ctxsize = crypto_ablkcipher_ctxsize,
	123	.init = crypto_init_ablkcipher_ops,
	124	#ifdef CONFIG_PROC_FS
	125	.show = crypto_ablkcipher_show,
	126	#endif
	127	};
	128	EXPORT_SYMBOL_GPL(crypto_ablkcipher_type);
	129
61da88e2 HX	130	static int no_givdecrypt(struct skcipher_givcrypt_request *req)
	131	{
	132	return -ENOSYS;
	133	}
	134
	135	static int crypto_init_givcipher_ops(struct crypto_tfm *tfm, u32 type,
	136	u32 mask)
	137	{
	138	struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher;
	139	struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher;
	140
	141	if (alg->ivsize > PAGE_SIZE / 8)
	142	return -EINVAL;
	143
ecfc4329 HX	144	crt->setkey = tfm->__crt_alg->cra_flags & CRYPTO_ALG_GENIV ?
ecfc4329 HX	145	alg->setkey : setkey;
61da88e2 HX	146	crt->encrypt = alg->encrypt;
	147	crt->decrypt = alg->decrypt;
	148	crt->givencrypt = alg->givencrypt;
	149	crt->givdecrypt = alg->givdecrypt ?: no_givdecrypt;
ecfc4329	150	crt->base = __crypto_ablkcipher_cast(tfm);
61da88e2 HX	151	crt->ivsize = alg->ivsize;
	152
	153	return 0;
	154	}
	155
	156	static void crypto_givcipher_show(struct seq_file m, struct crypto_alg alg)
	157	__attribute__ ((unused));
	158	static void crypto_givcipher_show(struct seq_file m, struct crypto_alg alg)
	159	{
	160	struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher;
	161
	162	seq_printf(m, "type : givcipher\n");
189ed66e HX	163	seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
189ed66e HX	164	"yes" : "no");
61da88e2 HX	165	seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
	166	seq_printf(m, "min keysize : %u\n", ablkcipher->min_keysize);
	167	seq_printf(m, "max keysize : %u\n", ablkcipher->max_keysize);
	168	seq_printf(m, "ivsize : %u\n", ablkcipher->ivsize);
23508e11	169	seq_printf(m, "geniv : %s\n", ablkcipher->geniv ?: "<built-in>");
61da88e2 HX	170	}
	171
	172	const struct crypto_type crypto_givcipher_type = {
	173	.ctxsize = crypto_ablkcipher_ctxsize,
	174	.init = crypto_init_givcipher_ops,
	175	#ifdef CONFIG_PROC_FS
	176	.show = crypto_givcipher_show,
	177	#endif
	178	};
	179	EXPORT_SYMBOL_GPL(crypto_givcipher_type);
	180
ecfc4329 HX	181	const char crypto_default_geniv(const struct crypto_alg alg)
	182	{
	183	return alg->cra_flags & CRYPTO_ALG_ASYNC ? "eseqiv" : "chainiv";
	184	}
	185
b9c55aa4 HX	186	static int crypto_givcipher_default(struct crypto_alg *alg, u32 type, u32 mask)
	187	{
	188	struct rtattr *tb[3];
	189	struct {
	190	struct rtattr attr;
	191	struct crypto_attr_type data;
	192	} ptype;
	193	struct {
	194	struct rtattr attr;
	195	struct crypto_attr_alg data;
	196	} palg;
	197	struct crypto_template *tmpl;
	198	struct crypto_instance *inst;
	199	struct crypto_alg *larval;
	200	const char *geniv;
	201	int err;
	202
	203	larval = crypto_larval_lookup(alg->cra_driver_name,
	204	CRYPTO_ALG_TYPE_GIVCIPHER,
	205	CRYPTO_ALG_TYPE_MASK);
	206	err = PTR_ERR(larval);
	207	if (IS_ERR(larval))
	208	goto out;
	209
	210	err = -EAGAIN;
	211	if (!crypto_is_larval(larval))
	212	goto drop_larval;
	213
	214	ptype.attr.rta_len = sizeof(ptype);
	215	ptype.attr.rta_type = CRYPTOA_TYPE;
	216	ptype.data.type = type \| CRYPTO_ALG_GENIV;
	217	/* GENIV tells the template that we're making a default geniv. */
	218	ptype.data.mask = mask \| CRYPTO_ALG_GENIV;
	219	tb[0] = &ptype.attr;
	220
	221	palg.attr.rta_len = sizeof(palg);
	222	palg.attr.rta_type = CRYPTOA_ALG;
	223	/* Must use the exact name to locate ourselves. */
	224	memcpy(palg.data.name, alg->cra_driver_name, CRYPTO_MAX_ALG_NAME);
	225	tb[1] = &palg.attr;
	226
	227	tb[2] = NULL;
	228
	229	if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
	230	CRYPTO_ALG_TYPE_BLKCIPHER)
	231	geniv = alg->cra_blkcipher.geniv;
	232	else
	233	geniv = alg->cra_ablkcipher.geniv;
	234
	235	if (!geniv)
	236	geniv = crypto_default_geniv(alg);
	237
	238	tmpl = crypto_lookup_template(geniv);
	239	err = -ENOENT;
	240	if (!tmpl)
	241	goto kill_larval;
	242
	243	inst = tmpl->alloc(tb);
	244	err = PTR_ERR(inst);
	245	if (IS_ERR(inst))
	246	goto put_tmpl;
	247
	248	if ((err = crypto_register_instance(tmpl, inst))) {
	249	tmpl->free(inst);
250	goto put_tmpl;
251	}
252
253	/* Redo the lookup to use the instance we just registered. */
254	err = -EAGAIN;
255
256	put_tmpl:
257	crypto_tmpl_put(tmpl);
258	kill_larval:
259	crypto_larval_kill(larval);
260	drop_larval:
261	crypto_mod_put(larval);
262	out:
263	crypto_mod_put(alg);
264	return err;
265	}
266
267	static struct crypto_alg crypto_lookup_skcipher(const char name, u32 type,
268	u32 mask)
269	{
270	struct crypto_alg *alg;
271
272	alg = crypto_alg_mod_lookup(name, type, mask);
273	if (IS_ERR(alg))
274	return alg;
275
276	if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
277	CRYPTO_ALG_TYPE_GIVCIPHER)
278	return alg;
279
280	if (!((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
281	CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize :
282	alg->cra_ablkcipher.ivsize))
283	return alg;
284
285	return ERR_PTR(crypto_givcipher_default(alg, type, mask));
286	}
287
378f4f51 HX	288	int crypto_grab_skcipher(struct crypto_skcipher_spawn spawn, const char name,
	289	u32 type, u32 mask)
	290	{
	291	struct crypto_alg *alg;
	292	int err;
	293
	294	type = crypto_skcipher_type(type);
	295	mask = crypto_skcipher_mask(mask);
	296
b9c55aa4	297	alg = crypto_lookup_skcipher(name, type, mask);
378f4f51 HX	298	if (IS_ERR(alg))
	299	return PTR_ERR(alg);
	300
	301	err = crypto_init_spawn(&spawn->base, alg, spawn->base.inst, mask);
	302	crypto_mod_put(alg);
	303	return err;
	304	}
	305	EXPORT_SYMBOL_GPL(crypto_grab_skcipher);
	306
b9c55aa4 HX	307	struct crypto_ablkcipher crypto_alloc_ablkcipher(const char alg_name,
	308	u32 type, u32 mask)
	309	{
	310	struct crypto_tfm *tfm;
	311	int err;
	312
	313	type = crypto_skcipher_type(type);
	314	mask = crypto_skcipher_mask(mask);
	315
	316	for (;;) {
	317	struct crypto_alg *alg;
	318
	319	alg = crypto_lookup_skcipher(alg_name, type, mask);
	320	if (IS_ERR(alg)) {
	321	err = PTR_ERR(alg);
	322	goto err;
	323	}
	324
	325	tfm = __crypto_alloc_tfm(alg, type, mask);
	326	if (!IS_ERR(tfm))
	327	return __crypto_ablkcipher_cast(tfm);
	328
	329	crypto_mod_put(alg);
	330	err = PTR_ERR(tfm);
	331
	332	err:
	333	if (err != -EAGAIN)
	334	break;
	335	if (signal_pending(current)) {
	336	err = -EINTR;
	337	break;
	338	}
	339	}
	340
	341	return ERR_PTR(err);
	342	}
	343	EXPORT_SYMBOL_GPL(crypto_alloc_ablkcipher);