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

/*
 * AEAD: Authenticated Encryption with Associated Data
 * 
 * This file provides API support for AEAD algorithms.
 *
 * 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/aead.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/rtnetlink.h>
#include <linux/slab.h>
#include <linux/seq_file.h>

#include "internal.h"

static int setkey_unaligned(struct crypto_aead *tfm, const u8 *key,
			    unsigned int keylen)
{
	struct aead_alg *aead = crypto_aead_alg(tfm);
	unsigned long alignmask = crypto_aead_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 = aead->setkey(tfm, alignbuffer, keylen);
	memset(alignbuffer, 0, keylen);
	kfree(buffer);
	return ret;
}

static int setkey(struct crypto_aead *tfm, const u8 *key, unsigned int keylen)
{
	struct aead_alg *aead = crypto_aead_alg(tfm);
	unsigned long alignmask = crypto_aead_alignmask(tfm);

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

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

int crypto_aead_setauthsize(struct crypto_aead *tfm, unsigned int authsize)
{
	struct aead_tfm *crt = crypto_aead_crt(tfm);
	int err;

	if (authsize > crypto_aead_alg(tfm)->maxauthsize)
		return -EINVAL;

	if (crypto_aead_alg(tfm)->setauthsize) {
		err = crypto_aead_alg(tfm)->setauthsize(crt->base, authsize);
		if (err)
			return err;
	}

	crypto_aead_crt(crt->base)->authsize = authsize;
	crt->authsize = authsize;
	return 0;
}
EXPORT_SYMBOL_GPL(crypto_aead_setauthsize);

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

static int no_givcrypt(struct aead_givcrypt_request *req)
{
	return -ENOSYS;
}

static int crypto_init_aead_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
{
	struct aead_alg *alg = &tfm->__crt_alg->cra_aead;
	struct aead_tfm *crt = &tfm->crt_aead;

	if (max(alg->maxauthsize, 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 ?: no_givcrypt;
	crt->givdecrypt = alg->givdecrypt ?: no_givcrypt;
	crt->base = __crypto_aead_cast(tfm);
	crt->ivsize = alg->ivsize;
	crt->authsize = alg->maxauthsize;

	return 0;
}

static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)
	__attribute__ ((unused));
static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)
{
	struct aead_alg *aead = &alg->cra_aead;

	seq_printf(m, "type         : aead\n");
	seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
	seq_printf(m, "ivsize       : %u\n", aead->ivsize);
	seq_printf(m, "maxauthsize  : %u\n", aead->maxauthsize);
	seq_printf(m, "geniv        : %s\n", aead->geniv ?: "<built-in>");
}

const struct crypto_type crypto_aead_type = {
	.ctxsize = crypto_aead_ctxsize,
	.init = crypto_init_aead_ops,
#ifdef CONFIG_PROC_FS
	.show = crypto_aead_show,
#endif
};
EXPORT_SYMBOL_GPL(crypto_aead_type);

static int aead_null_givencrypt(struct aead_givcrypt_request *req)
{
	return crypto_aead_encrypt(&req->areq);
}

static int aead_null_givdecrypt(struct aead_givcrypt_request *req)
{
	return crypto_aead_decrypt(&req->areq);
}

static int crypto_init_nivaead_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
{
	struct aead_alg *alg = &tfm->__crt_alg->cra_aead;
	struct aead_tfm *crt = &tfm->crt_aead;

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

	crt->setkey = setkey;
	crt->encrypt = alg->encrypt;
	crt->decrypt = alg->decrypt;
	if (!alg->ivsize) {
		crt->givencrypt = aead_null_givencrypt;
		crt->givdecrypt = aead_null_givdecrypt;
	}
	crt->base = __crypto_aead_cast(tfm);
	crt->ivsize = alg->ivsize;
	crt->authsize = alg->maxauthsize;

	return 0;
}

static void crypto_nivaead_show(struct seq_file *m, struct crypto_alg *alg)
	__attribute__ ((unused));
static void crypto_nivaead_show(struct seq_file *m, struct crypto_alg *alg)
{
	struct aead_alg *aead = &alg->cra_aead;

	seq_printf(m, "type         : nivaead\n");
	seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
	seq_printf(m, "ivsize       : %u\n", aead->ivsize);
	seq_printf(m, "maxauthsize  : %u\n", aead->maxauthsize);
	seq_printf(m, "geniv        : %s\n", aead->geniv);
}

const struct crypto_type crypto_nivaead_type = {
	.ctxsize = crypto_aead_ctxsize,
	.init = crypto_init_nivaead_ops,
#ifdef CONFIG_PROC_FS
	.show = crypto_nivaead_show,
#endif
};
EXPORT_SYMBOL_GPL(crypto_nivaead_type);

static int crypto_grab_nivaead(struct crypto_aead_spawn *spawn,
			       const char *name, u32 type, u32 mask)
{
	struct crypto_alg *alg;
	int err;

	type &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
	type |= CRYPTO_ALG_TYPE_AEAD;
	mask |= CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV;

	alg = crypto_alg_mod_lookup(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;
}

struct crypto_instance *aead_geniv_alloc(struct crypto_template *tmpl,
					 struct rtattr **tb, u32 type,
					 u32 mask)
{
	const char *name;
	struct crypto_aead_spawn *spawn;
	struct crypto_attr_type *algt;
	struct crypto_instance *inst;
	struct crypto_alg *alg;
	int err;

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

	if ((algt->type ^ (CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_GENIV)) &
	    algt->mask)
		return ERR_PTR(-EINVAL);

	name = crypto_attr_alg_name(tb[1]);
	err = PTR_ERR(name);
	if (IS_ERR(name))
		return ERR_PTR(err);

	inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
	if (!inst)
		return ERR_PTR(-ENOMEM);

	spawn = crypto_instance_ctx(inst);

	/* Ignore async algorithms if necessary. */
	mask |= crypto_requires_sync(algt->type, algt->mask);

	crypto_set_aead_spawn(spawn, inst);
	err = crypto_grab_nivaead(spawn, name, type, mask);
	if (err)
		goto err_free_inst;

	alg = crypto_aead_spawn_alg(spawn);

	err = -EINVAL;
	if (!alg->cra_aead.ivsize)
		goto err_drop_alg;

	/*
	 * This is only true if we're constructing an algorithm with its
	 * default IV generator.  For the default generator we elide the
	 * template name and double-check the IV generator.
	 */
	if (algt->mask & CRYPTO_ALG_GENIV) {
		if (strcmp(tmpl->name, alg->cra_aead.geniv))
			goto err_drop_alg;

		memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
		memcpy(inst->alg.cra_driver_name, alg->cra_driver_name,
		       CRYPTO_MAX_ALG_NAME);
	} else {
		err = -ENAMETOOLONG;
		if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
			     "%s(%s)", tmpl->name, alg->cra_name) >=
		    CRYPTO_MAX_ALG_NAME)
			goto err_drop_alg;
		if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
			     "%s(%s)", tmpl->name, alg->cra_driver_name) >=
		    CRYPTO_MAX_ALG_NAME)
			goto err_drop_alg;
	}

	inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_GENIV;
	inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC;
	inst->alg.cra_priority = alg->cra_priority;
	inst->alg.cra_blocksize = alg->cra_blocksize;
	inst->alg.cra_alignmask = alg->cra_alignmask;
	inst->alg.cra_type = &crypto_aead_type;

	inst->alg.cra_aead.ivsize = alg->cra_aead.ivsize;
	inst->alg.cra_aead.maxauthsize = alg->cra_aead.maxauthsize;
	inst->alg.cra_aead.geniv = alg->cra_aead.geniv;

	inst->alg.cra_aead.setkey = alg->cra_aead.setkey;
	inst->alg.cra_aead.setauthsize = alg->cra_aead.setauthsize;
	inst->alg.cra_aead.encrypt = alg->cra_aead.encrypt;
	inst->alg.cra_aead.decrypt = alg->cra_aead.decrypt;

out:
	return inst;

err_drop_alg:
	crypto_drop_aead(spawn);
err_free_inst:
	kfree(inst);
	inst = ERR_PTR(err);
	goto out;
}
EXPORT_SYMBOL_GPL(aead_geniv_alloc);

void aead_geniv_free(struct crypto_instance *inst)
{
	crypto_drop_aead(crypto_instance_ctx(inst));
	kfree(inst);
}
EXPORT_SYMBOL_GPL(aead_geniv_free);

int aead_geniv_init(struct crypto_tfm *tfm)
{
	struct crypto_instance *inst = (void *)tfm->__crt_alg;
	struct crypto_aead *aead;

	aead = crypto_spawn_aead(crypto_instance_ctx(inst));
	if (IS_ERR(aead))
		return PTR_ERR(aead);

	tfm->crt_aead.base = aead;
	tfm->crt_aead.reqsize += crypto_aead_reqsize(aead);

	return 0;
}
EXPORT_SYMBOL_GPL(aead_geniv_init);

void aead_geniv_exit(struct crypto_tfm *tfm)
{
	crypto_free_aead(tfm->crt_aead.base);
}
EXPORT_SYMBOL_GPL(aead_geniv_exit);

static int crypto_nivaead_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_AEAD | CRYPTO_ALG_GENIV,
				      CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
	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;

	geniv = alg->cra_aead.geniv;

	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_aead(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_type == &crypto_aead_type)
		return alg;

	if (!alg->cra_aead.ivsize)
		return alg;

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

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

	type &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
	type |= CRYPTO_ALG_TYPE_AEAD;
	mask &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
	mask |= CRYPTO_ALG_TYPE_MASK;

	alg = crypto_lookup_aead(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_aead);

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

	type &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
	type |= CRYPTO_ALG_TYPE_AEAD;
	mask &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
	mask |= CRYPTO_ALG_TYPE_MASK;

	for (;;) {
		struct crypto_alg *alg;

		alg = crypto_lookup_aead(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_aead_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_aead);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Authenticated Encryption with Associated Data (AEAD)");
Commit	Line	Data
1ae97820 HX	1	/*
	2	* AEAD: Authenticated Encryption with Associated Data
	3	*
	4	* This file provides API support for AEAD algorithms.
	5	*
	6	* Copyright (c) 2007 Herbert Xu <herbert@gondor.apana.org.au>
	7	*
	8	* This program is free software; you can redistribute it and/or modify it
	9	* under the terms of the GNU General Public License as published by the Free
	10	* Software Foundation; either version 2 of the License, or (at your option)
	11	* any later version.
	12	*
	13	*/
	14
5b6d2d7f HX	15	#include <crypto/internal/aead.h>
5b6d2d7f HX	16	#include <linux/err.h>
1ae97820 HX	17	#include <linux/init.h>
	18	#include <linux/kernel.h>
	19	#include <linux/module.h>
d29ce988	20	#include <linux/rtnetlink.h>
1ae97820 HX	21	#include <linux/slab.h>
	22	#include <linux/seq_file.h>
	23
5b6d2d7f HX	24	#include "internal.h"
5b6d2d7f HX	25
1ae97820 HX	26	static int setkey_unaligned(struct crypto_aead tfm, const u8 key,
	27	unsigned int keylen)
	28	{
	29	struct aead_alg *aead = crypto_aead_alg(tfm);
	30	unsigned long alignmask = crypto_aead_alignmask(tfm);
	31	int ret;
	32	u8 buffer, alignbuffer;
	33	unsigned long absize;
	34
	35	absize = keylen + alignmask;
	36	buffer = kmalloc(absize, GFP_ATOMIC);
	37	if (!buffer)
	38	return -ENOMEM;
	39
	40	alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
	41	memcpy(alignbuffer, key, keylen);
	42	ret = aead->setkey(tfm, alignbuffer, keylen);
	43	memset(alignbuffer, 0, keylen);
	44	kfree(buffer);
	45	return ret;
	46	}
	47
	48	static int setkey(struct crypto_aead tfm, const u8 key, unsigned int keylen)
	49	{
	50	struct aead_alg *aead = crypto_aead_alg(tfm);
	51	unsigned long alignmask = crypto_aead_alignmask(tfm);
	52
	53	if ((unsigned long)key & alignmask)
	54	return setkey_unaligned(tfm, key, keylen);
	55
	56	return aead->setkey(tfm, key, keylen);
	57	}
	58
7ba683a6 HX	59	int crypto_aead_setauthsize(struct crypto_aead *tfm, unsigned int authsize)
7ba683a6 HX	60	{
5b6d2d7f	61	struct aead_tfm *crt = crypto_aead_crt(tfm);
7ba683a6 HX	62	int err;
	63
	64	if (authsize > crypto_aead_alg(tfm)->maxauthsize)
	65	return -EINVAL;
	66
	67	if (crypto_aead_alg(tfm)->setauthsize) {
5b6d2d7f	68	err = crypto_aead_alg(tfm)->setauthsize(crt->base, authsize);
7ba683a6 HX	69	if (err)
	70	return err;
	71	}
	72
5b6d2d7f HX	73	crypto_aead_crt(crt->base)->authsize = authsize;
5b6d2d7f HX	74	crt->authsize = authsize;
7ba683a6 HX	75	return 0;
	76	}
	77	EXPORT_SYMBOL_GPL(crypto_aead_setauthsize);
	78
1ae97820 HX	79	static unsigned int crypto_aead_ctxsize(struct crypto_alg *alg, u32 type,
	80	u32 mask)
	81	{
	82	return alg->cra_ctxsize;
	83	}
	84
aedb30dc	85	static int no_givcrypt(struct aead_givcrypt_request *req)
743edf57 HX	86	{
	87	return -ENOSYS;
	88	}
	89
1ae97820 HX	90	static int crypto_init_aead_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
	91	{
	92	struct aead_alg *alg = &tfm->__crt_alg->cra_aead;
	93	struct aead_tfm *crt = &tfm->crt_aead;
	94
7ba683a6	95	if (max(alg->maxauthsize, alg->ivsize) > PAGE_SIZE / 8)
1ae97820 HX	96	return -EINVAL;
1ae97820 HX	97
5b6d2d7f HX	98	crt->setkey = tfm->__crt_alg->cra_flags & CRYPTO_ALG_GENIV ?
5b6d2d7f HX	99	alg->setkey : setkey;
1ae97820 HX	100	crt->encrypt = alg->encrypt;
1ae97820 HX	101	crt->decrypt = alg->decrypt;
aedb30dc HX	102	crt->givencrypt = alg->givencrypt ?: no_givcrypt;
aedb30dc HX	103	crt->givdecrypt = alg->givdecrypt ?: no_givcrypt;
5b6d2d7f	104	crt->base = __crypto_aead_cast(tfm);
1ae97820	105	crt->ivsize = alg->ivsize;
7ba683a6	106	crt->authsize = alg->maxauthsize;
1ae97820 HX	107
	108	return 0;
	109	}
	110
	111	static void crypto_aead_show(struct seq_file m, struct crypto_alg alg)
	112	__attribute__ ((unused));
	113	static void crypto_aead_show(struct seq_file m, struct crypto_alg alg)
	114	{
	115	struct aead_alg *aead = &alg->cra_aead;
	116
	117	seq_printf(m, "type : aead\n");
	118	seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
	119	seq_printf(m, "ivsize : %u\n", aead->ivsize);
7ba683a6	120	seq_printf(m, "maxauthsize : %u\n", aead->maxauthsize);
5b6d2d7f	121	seq_printf(m, "geniv : %s\n", aead->geniv ?: "<built-in>");
1ae97820 HX	122	}
	123
	124	const struct crypto_type crypto_aead_type = {
	125	.ctxsize = crypto_aead_ctxsize,
	126	.init = crypto_init_aead_ops,
	127	#ifdef CONFIG_PROC_FS
	128	.show = crypto_aead_show,
	129	#endif
	130	};
	131	EXPORT_SYMBOL_GPL(crypto_aead_type);
	132
5b6d2d7f HX	133	static int aead_null_givencrypt(struct aead_givcrypt_request *req)
	134	{
	135	return crypto_aead_encrypt(&req->areq);
	136	}
	137
	138	static int aead_null_givdecrypt(struct aead_givcrypt_request *req)
	139	{
	140	return crypto_aead_decrypt(&req->areq);
	141	}
	142
	143	static int crypto_init_nivaead_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
	144	{
	145	struct aead_alg *alg = &tfm->__crt_alg->cra_aead;
	146	struct aead_tfm *crt = &tfm->crt_aead;
	147
	148	if (max(alg->maxauthsize, alg->ivsize) > PAGE_SIZE / 8)
	149	return -EINVAL;
	150
	151	crt->setkey = setkey;
	152	crt->encrypt = alg->encrypt;
	153	crt->decrypt = alg->decrypt;
	154	if (!alg->ivsize) {
	155	crt->givencrypt = aead_null_givencrypt;
	156	crt->givdecrypt = aead_null_givdecrypt;
	157	}
	158	crt->base = __crypto_aead_cast(tfm);
	159	crt->ivsize = alg->ivsize;
	160	crt->authsize = alg->maxauthsize;
	161
	162	return 0;
	163	}
	164
	165	static void crypto_nivaead_show(struct seq_file m, struct crypto_alg alg)
	166	__attribute__ ((unused));
	167	static void crypto_nivaead_show(struct seq_file m, struct crypto_alg alg)
	168	{
	169	struct aead_alg *aead = &alg->cra_aead;
	170
	171	seq_printf(m, "type : nivaead\n");
	172	seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
	173	seq_printf(m, "ivsize : %u\n", aead->ivsize);
	174	seq_printf(m, "maxauthsize : %u\n", aead->maxauthsize);
	175	seq_printf(m, "geniv : %s\n", aead->geniv);
	176	}
	177
	178	const struct crypto_type crypto_nivaead_type = {
	179	.ctxsize = crypto_aead_ctxsize,
	180	.init = crypto_init_nivaead_ops,
	181	#ifdef CONFIG_PROC_FS
	182	.show = crypto_nivaead_show,
	183	#endif
	184	};
	185	EXPORT_SYMBOL_GPL(crypto_nivaead_type);
	186
	187	static int crypto_grab_nivaead(struct crypto_aead_spawn *spawn,
	188	const char *name, u32 type, u32 mask)
	189	{
	190	struct crypto_alg *alg;
	191	int err;
	192
	193	type &= ~(CRYPTO_ALG_TYPE_MASK \| CRYPTO_ALG_GENIV);
	194	type \|= CRYPTO_ALG_TYPE_AEAD;
	195	mask \|= CRYPTO_ALG_TYPE_MASK \| CRYPTO_ALG_GENIV;
	196
197	alg = crypto_alg_mod_lookup(name, type, mask);
198	if (IS_ERR(alg))
199	return PTR_ERR(alg);
200
201	err = crypto_init_spawn(&spawn->base, alg, spawn->base.inst, mask);
202	crypto_mod_put(alg);
203	return err;
204	}
205
206	struct crypto_instance aead_geniv_alloc(struct crypto_template tmpl,
207	struct rtattr **tb, u32 type,
208	u32 mask)
209	{
210	const char *name;
211	struct crypto_aead_spawn *spawn;
212	struct crypto_attr_type *algt;
213	struct crypto_instance *inst;
214	struct crypto_alg *alg;
215	int err;
216
217	algt = crypto_get_attr_type(tb);
218	err = PTR_ERR(algt);
219	if (IS_ERR(algt))
220	return ERR_PTR(err);
221
222	if ((algt->type ^ (CRYPTO_ALG_TYPE_AEAD \| CRYPTO_ALG_GENIV)) &
223	algt->mask)
224	return ERR_PTR(-EINVAL);
225
226	name = crypto_attr_alg_name(tb[1]);
227	err = PTR_ERR(name);
228	if (IS_ERR(name))
229	return ERR_PTR(err);
230
231	inst = kzalloc(sizeof(inst) + sizeof(spawn), GFP_KERNEL);
232	if (!inst)
233	return ERR_PTR(-ENOMEM);
234
235	spawn = crypto_instance_ctx(inst);
236
237	/* Ignore async algorithms if necessary. */
238	mask \|= crypto_requires_sync(algt->type, algt->mask);
239
240	crypto_set_aead_spawn(spawn, inst);
241	err = crypto_grab_nivaead(spawn, name, type, mask);
242	if (err)
243	goto err_free_inst;
244
245	alg = crypto_aead_spawn_alg(spawn);
246
247	err = -EINVAL;
248	if (!alg->cra_aead.ivsize)
249	goto err_drop_alg;
250
251	/*
252	* This is only true if we're constructing an algorithm with its
253	* default IV generator. For the default generator we elide the
254	* template name and double-check the IV generator.
255	*/
256	if (algt->mask & CRYPTO_ALG_GENIV) {
257	if (strcmp(tmpl->name, alg->cra_aead.geniv))
258	goto err_drop_alg;
259
260	memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
261	memcpy(inst->alg.cra_driver_name, alg->cra_driver_name,
262	CRYPTO_MAX_ALG_NAME);
263	} else {
264	err = -ENAMETOOLONG;
265	if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
266	"%s(%s)", tmpl->name, alg->cra_name) >=
267	CRYPTO_MAX_ALG_NAME)
268	goto err_drop_alg;
269	if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
270	"%s(%s)", tmpl->name, alg->cra_driver_name) >=
271	CRYPTO_MAX_ALG_NAME)
272	goto err_drop_alg;
273	}
274
275	inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD \| CRYPTO_ALG_GENIV;
276	inst->alg.cra_flags \|= alg->cra_flags & CRYPTO_ALG_ASYNC;
277	inst->alg.cra_priority = alg->cra_priority;
278	inst->alg.cra_blocksize = alg->cra_blocksize;
279	inst->alg.cra_alignmask = alg->cra_alignmask;
280	inst->alg.cra_type = &crypto_aead_type;
281
282	inst->alg.cra_aead.ivsize = alg->cra_aead.ivsize;
283	inst->alg.cra_aead.maxauthsize = alg->cra_aead.maxauthsize;
284	inst->alg.cra_aead.geniv = alg->cra_aead.geniv;
285
286	inst->alg.cra_aead.setkey = alg->cra_aead.setkey;
287	inst->alg.cra_aead.setauthsize = alg->cra_aead.setauthsize;
288	inst->alg.cra_aead.encrypt = alg->cra_aead.encrypt;
289	inst->alg.cra_aead.decrypt = alg->cra_aead.decrypt;
290
291	out:
292	return inst;
293
294	err_drop_alg:
295	crypto_drop_aead(spawn);
296	err_free_inst:
297	kfree(inst);
298	inst = ERR_PTR(err);
299	goto out;
300	}
301	EXPORT_SYMBOL_GPL(aead_geniv_alloc);
302
303	void aead_geniv_free(struct crypto_instance *inst)
304	{
305	crypto_drop_aead(crypto_instance_ctx(inst));
306	kfree(inst);
307	}
308	EXPORT_SYMBOL_GPL(aead_geniv_free);
309
310	int aead_geniv_init(struct crypto_tfm *tfm)
311	{
312	struct crypto_instance inst = (void )tfm->__crt_alg;
313	struct crypto_aead *aead;
314
315	aead = crypto_spawn_aead(crypto_instance_ctx(inst));
316	if (IS_ERR(aead))
317	return PTR_ERR(aead);
318
319	tfm->crt_aead.base = aead;
320	tfm->crt_aead.reqsize += crypto_aead_reqsize(aead);
321
322	return 0;
323	}
324	EXPORT_SYMBOL_GPL(aead_geniv_init);
325
326	void aead_geniv_exit(struct crypto_tfm *tfm)
327	{
328	crypto_free_aead(tfm->crt_aead.base);
329	}
330	EXPORT_SYMBOL_GPL(aead_geniv_exit);
331
d29ce988 HX	332	static int crypto_nivaead_default(struct crypto_alg *alg, u32 type, u32 mask)
	333	{
	334	struct rtattr *tb[3];
	335	struct {
	336	struct rtattr attr;
	337	struct crypto_attr_type data;
	338	} ptype;
	339	struct {
	340	struct rtattr attr;
	341	struct crypto_attr_alg data;
	342	} palg;
	343	struct crypto_template *tmpl;
	344	struct crypto_instance *inst;
	345	struct crypto_alg *larval;
	346	const char *geniv;
	347	int err;
	348
	349	larval = crypto_larval_lookup(alg->cra_driver_name,
	350	CRYPTO_ALG_TYPE_AEAD \| CRYPTO_ALG_GENIV,
	351	CRYPTO_ALG_TYPE_MASK \| CRYPTO_ALG_GENIV);
	352	err = PTR_ERR(larval);
	353	if (IS_ERR(larval))
	354	goto out;
	355
	356	err = -EAGAIN;
	357	if (!crypto_is_larval(larval))
	358	goto drop_larval;
	359
	360	ptype.attr.rta_len = sizeof(ptype);
	361	ptype.attr.rta_type = CRYPTOA_TYPE;
	362	ptype.data.type = type \| CRYPTO_ALG_GENIV;
	363	/* GENIV tells the template that we're making a default geniv. */
	364	ptype.data.mask = mask \| CRYPTO_ALG_GENIV;
	365	tb[0] = &ptype.attr;
	366
	367	palg.attr.rta_len = sizeof(palg);
	368	palg.attr.rta_type = CRYPTOA_ALG;
	369	/* Must use the exact name to locate ourselves. */
	370	memcpy(palg.data.name, alg->cra_driver_name, CRYPTO_MAX_ALG_NAME);
	371	tb[1] = &palg.attr;
	372
	373	tb[2] = NULL;
	374
	375	geniv = alg->cra_aead.geniv;
	376
	377	tmpl = crypto_lookup_template(geniv);
	378	err = -ENOENT;
	379	if (!tmpl)
	380	goto kill_larval;
	381
	382	inst = tmpl->alloc(tb);
	383	err = PTR_ERR(inst);
	384	if (IS_ERR(inst))
	385	goto put_tmpl;
	386
	387	if ((err = crypto_register_instance(tmpl, inst))) {
	388	tmpl->free(inst);
	389	goto put_tmpl;
	390	}
	391
	392	/* Redo the lookup to use the instance we just registered. */
	393	err = -EAGAIN;
	394
	395	put_tmpl:
396	crypto_tmpl_put(tmpl);
397	kill_larval:
398	crypto_larval_kill(larval);
399	drop_larval:
400	crypto_mod_put(larval);
401	out:
402	crypto_mod_put(alg);
403	return err;
404	}
405
406	static struct crypto_alg crypto_lookup_aead(const char name, u32 type,
407	u32 mask)
408	{
409	struct crypto_alg *alg;
410
411	alg = crypto_alg_mod_lookup(name, type, mask);
412	if (IS_ERR(alg))
413	return alg;
414
415	if (alg->cra_type == &crypto_aead_type)
416	return alg;
417
418	if (!alg->cra_aead.ivsize)
419	return alg;
420
421	return ERR_PTR(crypto_nivaead_default(alg, type, mask));
422	}
423
424	int crypto_grab_aead(struct crypto_aead_spawn spawn, const char name,
425	u32 type, u32 mask)
426	{
427	struct crypto_alg *alg;
428	int err;
429
430	type &= ~(CRYPTO_ALG_TYPE_MASK \| CRYPTO_ALG_GENIV);
431	type \|= CRYPTO_ALG_TYPE_AEAD;
432	mask &= ~(CRYPTO_ALG_TYPE_MASK \| CRYPTO_ALG_GENIV);
433	mask \|= CRYPTO_ALG_TYPE_MASK;
434
435	alg = crypto_lookup_aead(name, type, mask);
436	if (IS_ERR(alg))
437	return PTR_ERR(alg);
438
439	err = crypto_init_spawn(&spawn->base, alg, spawn->base.inst, mask);
440	crypto_mod_put(alg);
441	return err;
442	}
443	EXPORT_SYMBOL_GPL(crypto_grab_aead);
444
445	struct crypto_aead crypto_alloc_aead(const char alg_name, u32 type, u32 mask)
446	{
447	struct crypto_tfm *tfm;
448	int err;
449
450	type &= ~(CRYPTO_ALG_TYPE_MASK \| CRYPTO_ALG_GENIV);
451	type \|= CRYPTO_ALG_TYPE_AEAD;
452	mask &= ~(CRYPTO_ALG_TYPE_MASK \| CRYPTO_ALG_GENIV);
453	mask \|= CRYPTO_ALG_TYPE_MASK;
454
455	for (;;) {
456	struct crypto_alg *alg;
457
458	alg = crypto_lookup_aead(alg_name, type, mask);
459	if (IS_ERR(alg)) {
460	err = PTR_ERR(alg);
461	goto err;
462	}
463
464	tfm = __crypto_alloc_tfm(alg, type, mask);
465	if (!IS_ERR(tfm))
466	return __crypto_aead_cast(tfm);
467
468	crypto_mod_put(alg);
469	err = PTR_ERR(tfm);
470
471	err:
472	if (err != -EAGAIN)
473	break;
474	if (signal_pending(current)) {
475	err = -EINTR;
476	break;
477	}
478	}
479
480	return ERR_PTR(err);
481	}
482	EXPORT_SYMBOL_GPL(crypto_alloc_aead);
483
1ae97820 HX	484	MODULE_LICENSE("GPL");
1ae97820 HX	485	MODULE_DESCRIPTION("Authenticated Encryption with Associated Data (AEAD)");