[linux-block.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/cpumask.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 const char *skcipher_default_geniv __read_mostly;

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

	return alg->cra_flags & CRYPTO_ALG_ASYNC ?
	       "eseqiv" : skcipher_default_geniv;
}

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,
				      (type & ~CRYPTO_ALG_TYPE_MASK) |
				      CRYPTO_ALG_TYPE_GIVCIPHER,
				      mask | 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;

	crypto_mod_put(alg);
	alg = crypto_alg_mod_lookup(name, type | CRYPTO_ALG_TESTED,
				    mask & ~CRYPTO_ALG_TESTED);
	if (IS_ERR(alg))
		return alg;

	if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
	    CRYPTO_ALG_TYPE_GIVCIPHER) {
		if ((alg->cra_flags ^ type ^ ~mask) & CRYPTO_ALG_TESTED) {
			crypto_mod_put(alg);
			alg = ERR_PTR(-ENOENT);
		}
		return alg;
	}

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

	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);

static int __init skcipher_module_init(void)
{
	skcipher_default_geniv = num_possible_cpus() > 1 ?
				 "eseqiv" : "chainiv";
	return 0;
}

static void skcipher_module_exit(void)
{
}

module_init(skcipher_module_init);
module_exit(skcipher_module_exit);
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	16	#include <crypto/internal/skcipher.h>
0b67fb65	17	#include <linux/cpumask.h>
378f4f51	18	#include <linux/err.h>
b5b7f088	19	#include <linux/init.h>
791b4d5f	20	#include <linux/kernel.h>
b5b7f088	21	#include <linux/module.h>
b9c55aa4 HX	22	#include <linux/rtnetlink.h>
b9c55aa4 HX	23	#include <linux/sched.h>
791b4d5f	24	#include <linux/slab.h>
b5b7f088 HX	25	#include <linux/seq_file.h>
b5b7f088 HX	26
378f4f51 HX	27	#include "internal.h"
378f4f51 HX	28
0b67fb65 HX	29	static const char *skcipher_default_geniv __read_mostly;
0b67fb65 HX	30
791b4d5f HX	31	static int setkey_unaligned(struct crypto_ablkcipher tfm, const u8 key,
791b4d5f HX	32	unsigned int keylen)
ca7c3938 SS	33	{
	34	struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm);
	35	unsigned long alignmask = crypto_ablkcipher_alignmask(tfm);
	36	int ret;
	37	u8 buffer, alignbuffer;
	38	unsigned long absize;
	39
	40	absize = keylen + alignmask;
	41	buffer = kmalloc(absize, GFP_ATOMIC);
	42	if (!buffer)
	43	return -ENOMEM;
	44
	45	alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
	46	memcpy(alignbuffer, key, keylen);
	47	ret = cipher->setkey(tfm, alignbuffer, keylen);
06817176	48	memset(alignbuffer, 0, keylen);
ca7c3938 SS	49	kfree(buffer);
	50	return ret;
	51	}
	52
b5b7f088 HX	53	static int setkey(struct crypto_ablkcipher tfm, const u8 key,
	54	unsigned int keylen)
	55	{
	56	struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm);
ca7c3938	57	unsigned long alignmask = crypto_ablkcipher_alignmask(tfm);
b5b7f088 HX	58
	59	if (keylen < cipher->min_keysize \|\| keylen > cipher->max_keysize) {
	60	crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
	61	return -EINVAL;
	62	}
	63
ca7c3938 SS	64	if ((unsigned long)key & alignmask)
	65	return setkey_unaligned(tfm, key, keylen);
	66
b5b7f088 HX	67	return cipher->setkey(tfm, key, keylen);
	68	}
	69
	70	static unsigned int crypto_ablkcipher_ctxsize(struct crypto_alg *alg, u32 type,
	71	u32 mask)
	72	{
	73	return alg->cra_ctxsize;
	74	}
	75
b9c55aa4 HX	76	int skcipher_null_givencrypt(struct skcipher_givcrypt_request *req)
	77	{
	78	return crypto_ablkcipher_encrypt(&req->creq);
	79	}
	80
	81	int skcipher_null_givdecrypt(struct skcipher_givcrypt_request *req)
	82	{
	83	return crypto_ablkcipher_decrypt(&req->creq);
	84	}
	85
b5b7f088 HX	86	static int crypto_init_ablkcipher_ops(struct crypto_tfm *tfm, u32 type,
	87	u32 mask)
	88	{
	89	struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher;
	90	struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher;
	91
	92	if (alg->ivsize > PAGE_SIZE / 8)
	93	return -EINVAL;
	94
	95	crt->setkey = setkey;
	96	crt->encrypt = alg->encrypt;
	97	crt->decrypt = alg->decrypt;
b9c55aa4 HX	98	if (!alg->ivsize) {
	99	crt->givencrypt = skcipher_null_givencrypt;
	100	crt->givdecrypt = skcipher_null_givdecrypt;
	101	}
ecfc4329	102	crt->base = __crypto_ablkcipher_cast(tfm);
b5b7f088 HX	103	crt->ivsize = alg->ivsize;
	104
	105	return 0;
	106	}
	107
	108	static void crypto_ablkcipher_show(struct seq_file m, struct crypto_alg alg)
	109	__attribute__ ((unused));
	110	static void crypto_ablkcipher_show(struct seq_file m, struct crypto_alg alg)
	111	{
	112	struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher;
	113
	114	seq_printf(m, "type : ablkcipher\n");
189ed66e HX	115	seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
189ed66e HX	116	"yes" : "no");
b5b7f088 HX	117	seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
	118	seq_printf(m, "min keysize : %u\n", ablkcipher->min_keysize);
	119	seq_printf(m, "max keysize : %u\n", ablkcipher->max_keysize);
	120	seq_printf(m, "ivsize : %u\n", ablkcipher->ivsize);
23508e11	121	seq_printf(m, "geniv : %s\n", ablkcipher->geniv ?: "<default>");
b5b7f088 HX	122	}
	123
	124	const struct crypto_type crypto_ablkcipher_type = {
	125	.ctxsize = crypto_ablkcipher_ctxsize,
	126	.init = crypto_init_ablkcipher_ops,
	127	#ifdef CONFIG_PROC_FS
	128	.show = crypto_ablkcipher_show,
	129	#endif
	130	};
	131	EXPORT_SYMBOL_GPL(crypto_ablkcipher_type);
	132
61da88e2 HX	133	static int no_givdecrypt(struct skcipher_givcrypt_request *req)
	134	{
	135	return -ENOSYS;
	136	}
	137
	138	static int crypto_init_givcipher_ops(struct crypto_tfm *tfm, u32 type,
	139	u32 mask)
	140	{
	141	struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher;
	142	struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher;
	143
	144	if (alg->ivsize > PAGE_SIZE / 8)
	145	return -EINVAL;
	146
ecfc4329 HX	147	crt->setkey = tfm->__crt_alg->cra_flags & CRYPTO_ALG_GENIV ?
ecfc4329 HX	148	alg->setkey : setkey;
61da88e2 HX	149	crt->encrypt = alg->encrypt;
	150	crt->decrypt = alg->decrypt;
	151	crt->givencrypt = alg->givencrypt;
	152	crt->givdecrypt = alg->givdecrypt ?: no_givdecrypt;
ecfc4329	153	crt->base = __crypto_ablkcipher_cast(tfm);
61da88e2 HX	154	crt->ivsize = alg->ivsize;
	155
	156	return 0;
	157	}
	158
	159	static void crypto_givcipher_show(struct seq_file m, struct crypto_alg alg)
	160	__attribute__ ((unused));
	161	static void crypto_givcipher_show(struct seq_file m, struct crypto_alg alg)
	162	{
	163	struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher;
	164
	165	seq_printf(m, "type : givcipher\n");
189ed66e HX	166	seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
189ed66e HX	167	"yes" : "no");
61da88e2 HX	168	seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
	169	seq_printf(m, "min keysize : %u\n", ablkcipher->min_keysize);
	170	seq_printf(m, "max keysize : %u\n", ablkcipher->max_keysize);
	171	seq_printf(m, "ivsize : %u\n", ablkcipher->ivsize);
23508e11	172	seq_printf(m, "geniv : %s\n", ablkcipher->geniv ?: "<built-in>");
61da88e2 HX	173	}
	174
	175	const struct crypto_type crypto_givcipher_type = {
	176	.ctxsize = crypto_ablkcipher_ctxsize,
	177	.init = crypto_init_givcipher_ops,
	178	#ifdef CONFIG_PROC_FS
	179	.show = crypto_givcipher_show,
	180	#endif
	181	};
	182	EXPORT_SYMBOL_GPL(crypto_givcipher_type);
	183
ecfc4329 HX	184	const char crypto_default_geniv(const struct crypto_alg alg)
ecfc4329 HX	185	{
63b5ac28 HX	186	if (((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
	187	CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize :
	188	alg->cra_ablkcipher.ivsize) !=
	189	alg->cra_blocksize)
	190	return "chainiv";
	191
0b67fb65 HX	192	return alg->cra_flags & CRYPTO_ALG_ASYNC ?
0b67fb65 HX	193	"eseqiv" : skcipher_default_geniv;
ecfc4329 HX	194	}
ecfc4329 HX	195
b9c55aa4 HX	196	static int crypto_givcipher_default(struct crypto_alg *alg, u32 type, u32 mask)
	197	{
	198	struct rtattr *tb[3];
	199	struct {
	200	struct rtattr attr;
	201	struct crypto_attr_type data;
	202	} ptype;
	203	struct {
	204	struct rtattr attr;
	205	struct crypto_attr_alg data;
	206	} palg;
	207	struct crypto_template *tmpl;
	208	struct crypto_instance *inst;
	209	struct crypto_alg *larval;
	210	const char *geniv;
	211	int err;
	212
	213	larval = crypto_larval_lookup(alg->cra_driver_name,
435578ae	214	(type & ~CRYPTO_ALG_TYPE_MASK) \|
b9c55aa4	215	CRYPTO_ALG_TYPE_GIVCIPHER,
435578ae	216	mask \| CRYPTO_ALG_TYPE_MASK);
b9c55aa4 HX	217	err = PTR_ERR(larval);
	218	if (IS_ERR(larval))
	219	goto out;
	220
	221	err = -EAGAIN;
	222	if (!crypto_is_larval(larval))
	223	goto drop_larval;
	224
	225	ptype.attr.rta_len = sizeof(ptype);
	226	ptype.attr.rta_type = CRYPTOA_TYPE;
	227	ptype.data.type = type \| CRYPTO_ALG_GENIV;
	228	/* GENIV tells the template that we're making a default geniv. */
	229	ptype.data.mask = mask \| CRYPTO_ALG_GENIV;
	230	tb[0] = &ptype.attr;
	231
	232	palg.attr.rta_len = sizeof(palg);
	233	palg.attr.rta_type = CRYPTOA_ALG;
	234	/* Must use the exact name to locate ourselves. */
	235	memcpy(palg.data.name, alg->cra_driver_name, CRYPTO_MAX_ALG_NAME);
	236	tb[1] = &palg.attr;
	237
	238	tb[2] = NULL;
	239
	240	if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
	241	CRYPTO_ALG_TYPE_BLKCIPHER)
	242	geniv = alg->cra_blkcipher.geniv;
	243	else
	244	geniv = alg->cra_ablkcipher.geniv;
	245
	246	if (!geniv)
	247	geniv = crypto_default_geniv(alg);
	248
	249	tmpl = crypto_lookup_template(geniv);
	250	err = -ENOENT;
	251	if (!tmpl)
	252	goto kill_larval;
	253
	254	inst = tmpl->alloc(tb);
	255	err = PTR_ERR(inst);
	256	if (IS_ERR(inst))
	257	goto put_tmpl;
	258
	259	if ((err = crypto_register_instance(tmpl, inst))) {
	260	tmpl->free(inst);
	261	goto put_tmpl;
	262	}
	263
	264	/* Redo the lookup to use the instance we just registered. */
	265	err = -EAGAIN;
	266
	267	put_tmpl:
	268	crypto_tmpl_put(tmpl);
	269	kill_larval:
	270	crypto_larval_kill(larval);
	271	drop_larval:
	272	crypto_mod_put(larval);
	273	out:
	274	crypto_mod_put(alg);
	275	return err;
	276	}
	277
	278	static struct crypto_alg crypto_lookup_skcipher(const char name, u32 type,
	279	u32 mask)
	280	{
281	struct crypto_alg *alg;
282
283	alg = crypto_alg_mod_lookup(name, type, mask);
284	if (IS_ERR(alg))
285	return alg;
286
287	if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
288	CRYPTO_ALG_TYPE_GIVCIPHER)
289	return alg;
290
291	if (!((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
292	CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize :
293	alg->cra_ablkcipher.ivsize))
294	return alg;
295
b170a137 HX	296	crypto_mod_put(alg);
	297	alg = crypto_alg_mod_lookup(name, type \| CRYPTO_ALG_TESTED,
	298	mask & ~CRYPTO_ALG_TESTED);
	299	if (IS_ERR(alg))
	300	return alg;
	301
	302	if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
	303	CRYPTO_ALG_TYPE_GIVCIPHER) {
	304	if ((alg->cra_flags ^ type ^ ~mask) & CRYPTO_ALG_TESTED) {
	305	crypto_mod_put(alg);
	306	alg = ERR_PTR(-ENOENT);
	307	}
	308	return alg;
	309	}
	310
	311	BUG_ON(!((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
	312	CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize :
	313	alg->cra_ablkcipher.ivsize));
	314
b9c55aa4 HX	315	return ERR_PTR(crypto_givcipher_default(alg, type, mask));
	316	}
	317
378f4f51 HX	318	int crypto_grab_skcipher(struct crypto_skcipher_spawn spawn, const char name,
	319	u32 type, u32 mask)
	320	{
	321	struct crypto_alg *alg;
	322	int err;
	323
	324	type = crypto_skcipher_type(type);
	325	mask = crypto_skcipher_mask(mask);
	326
b9c55aa4	327	alg = crypto_lookup_skcipher(name, type, mask);
378f4f51 HX	328	if (IS_ERR(alg))
	329	return PTR_ERR(alg);
	330
	331	err = crypto_init_spawn(&spawn->base, alg, spawn->base.inst, mask);
	332	crypto_mod_put(alg);
	333	return err;
	334	}
	335	EXPORT_SYMBOL_GPL(crypto_grab_skcipher);
	336
b9c55aa4 HX	337	struct crypto_ablkcipher crypto_alloc_ablkcipher(const char alg_name,
	338	u32 type, u32 mask)
	339	{
	340	struct crypto_tfm *tfm;
	341	int err;
	342
	343	type = crypto_skcipher_type(type);
	344	mask = crypto_skcipher_mask(mask);
	345
	346	for (;;) {
	347	struct crypto_alg *alg;
	348
	349	alg = crypto_lookup_skcipher(alg_name, type, mask);
	350	if (IS_ERR(alg)) {
	351	err = PTR_ERR(alg);
	352	goto err;
	353	}
	354
	355	tfm = __crypto_alloc_tfm(alg, type, mask);
	356	if (!IS_ERR(tfm))
	357	return __crypto_ablkcipher_cast(tfm);
	358
	359	crypto_mod_put(alg);
	360	err = PTR_ERR(tfm);
	361
	362	err:
	363	if (err != -EAGAIN)
	364	break;
	365	if (signal_pending(current)) {
	366	err = -EINTR;
	367	break;
	368	}
	369	}
	370
	371	return ERR_PTR(err);
	372	}
	373	EXPORT_SYMBOL_GPL(crypto_alloc_ablkcipher);
0b67fb65 HX	374
	375	static int __init skcipher_module_init(void)
	376	{
	377	skcipher_default_geniv = num_possible_cpus() > 1 ?
	378	"eseqiv" : "chainiv";
	379	return 0;
	380	}
	381
	382	static void skcipher_module_exit(void)
	383	{
	384	}
	385
	386	module_init(skcipher_module_init);
	387	module_exit(skcipher_module_exit);