[linux.git] / crypto / aead.c

/*
 * AEAD: Authenticated Encryption with Associated Data
 * 
 * This file provides API support for AEAD algorithms.
 *
 * Copyright (c) 2007 Herbert Xu <[email protected]>
 *
 * 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, "async        : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
					     "yes" : "no");
	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, "async        : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
					     "yes" : "no");
	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 <[email protected]>
	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");
189ed66e HX	118	seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
189ed66e HX	119	"yes" : "no");
1ae97820 HX	120	seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
1ae97820 HX	121	seq_printf(m, "ivsize : %u\n", aead->ivsize);
7ba683a6	122	seq_printf(m, "maxauthsize : %u\n", aead->maxauthsize);
5b6d2d7f	123	seq_printf(m, "geniv : %s\n", aead->geniv ?: "<built-in>");
1ae97820 HX	124	}
	125
	126	const struct crypto_type crypto_aead_type = {
	127	.ctxsize = crypto_aead_ctxsize,
	128	.init = crypto_init_aead_ops,
	129	#ifdef CONFIG_PROC_FS
	130	.show = crypto_aead_show,
	131	#endif
	132	};
	133	EXPORT_SYMBOL_GPL(crypto_aead_type);
	134
5b6d2d7f HX	135	static int aead_null_givencrypt(struct aead_givcrypt_request *req)
	136	{
	137	return crypto_aead_encrypt(&req->areq);
	138	}
	139
	140	static int aead_null_givdecrypt(struct aead_givcrypt_request *req)
	141	{
	142	return crypto_aead_decrypt(&req->areq);
	143	}
	144
	145	static int crypto_init_nivaead_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
	146	{
	147	struct aead_alg *alg = &tfm->__crt_alg->cra_aead;
	148	struct aead_tfm *crt = &tfm->crt_aead;
	149
	150	if (max(alg->maxauthsize, alg->ivsize) > PAGE_SIZE / 8)
	151	return -EINVAL;
	152
	153	crt->setkey = setkey;
	154	crt->encrypt = alg->encrypt;
	155	crt->decrypt = alg->decrypt;
	156	if (!alg->ivsize) {
	157	crt->givencrypt = aead_null_givencrypt;
	158	crt->givdecrypt = aead_null_givdecrypt;
	159	}
	160	crt->base = __crypto_aead_cast(tfm);
	161	crt->ivsize = alg->ivsize;
	162	crt->authsize = alg->maxauthsize;
	163
	164	return 0;
	165	}
	166
	167	static void crypto_nivaead_show(struct seq_file m, struct crypto_alg alg)
	168	__attribute__ ((unused));
	169	static void crypto_nivaead_show(struct seq_file m, struct crypto_alg alg)
	170	{
	171	struct aead_alg *aead = &alg->cra_aead;
	172
	173	seq_printf(m, "type : nivaead\n");
189ed66e HX	174	seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
189ed66e HX	175	"yes" : "no");
5b6d2d7f HX	176	seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
	177	seq_printf(m, "ivsize : %u\n", aead->ivsize);
	178	seq_printf(m, "maxauthsize : %u\n", aead->maxauthsize);
	179	seq_printf(m, "geniv : %s\n", aead->geniv);
	180	}
	181
	182	const struct crypto_type crypto_nivaead_type = {
	183	.ctxsize = crypto_aead_ctxsize,
	184	.init = crypto_init_nivaead_ops,
	185	#ifdef CONFIG_PROC_FS
	186	.show = crypto_nivaead_show,
	187	#endif
	188	};
	189	EXPORT_SYMBOL_GPL(crypto_nivaead_type);
	190
	191	static int crypto_grab_nivaead(struct crypto_aead_spawn *spawn,
	192	const char *name, u32 type, u32 mask)
	193	{
	194	struct crypto_alg *alg;
	195	int err;
	196
	197	type &= ~(CRYPTO_ALG_TYPE_MASK \| CRYPTO_ALG_GENIV);
	198	type \|= CRYPTO_ALG_TYPE_AEAD;
	199	mask \|= CRYPTO_ALG_TYPE_MASK \| CRYPTO_ALG_GENIV;
	200
	201	alg = crypto_alg_mod_lookup(name, type, mask);
	202	if (IS_ERR(alg))
	203	return PTR_ERR(alg);
	204
	205	err = crypto_init_spawn(&spawn->base, alg, spawn->base.inst, mask);
	206	crypto_mod_put(alg);
	207	return err;
	208	}
	209
	210	struct crypto_instance aead_geniv_alloc(struct crypto_template tmpl,
	211	struct rtattr **tb, u32 type,
	212	u32 mask)
	213	{
	214	const char *name;
	215	struct crypto_aead_spawn *spawn;
	216	struct crypto_attr_type *algt;
	217	struct crypto_instance *inst;
	218	struct crypto_alg *alg;
	219	int err;
	220
	221	algt = crypto_get_attr_type(tb);
	222	err = PTR_ERR(algt);
	223	if (IS_ERR(algt))
	224	return ERR_PTR(err);
	225
	226	if ((algt->type ^ (CRYPTO_ALG_TYPE_AEAD \| CRYPTO_ALG_GENIV)) &
	227	algt->mask)
	228	return ERR_PTR(-EINVAL);
	229
	230	name = crypto_attr_alg_name(tb[1]);
	231	err = PTR_ERR(name);
	232	if (IS_ERR(name))
	233	return ERR_PTR(err);
	234
	235	inst = kzalloc(sizeof(inst) + sizeof(spawn), GFP_KERNEL);
	236	if (!inst)
	237	return ERR_PTR(-ENOMEM);
	238
	239	spawn = crypto_instance_ctx(inst);
240
241	/* Ignore async algorithms if necessary. */
242	mask \|= crypto_requires_sync(algt->type, algt->mask);
243
244	crypto_set_aead_spawn(spawn, inst);
245	err = crypto_grab_nivaead(spawn, name, type, mask);
246	if (err)
247	goto err_free_inst;
248
249	alg = crypto_aead_spawn_alg(spawn);
250
251	err = -EINVAL;
252	if (!alg->cra_aead.ivsize)
253	goto err_drop_alg;
254
255	/*
256	* This is only true if we're constructing an algorithm with its
257	* default IV generator. For the default generator we elide the
258	* template name and double-check the IV generator.
259	*/
260	if (algt->mask & CRYPTO_ALG_GENIV) {
261	if (strcmp(tmpl->name, alg->cra_aead.geniv))
262	goto err_drop_alg;
263
264	memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
265	memcpy(inst->alg.cra_driver_name, alg->cra_driver_name,
266	CRYPTO_MAX_ALG_NAME);
267	} else {
268	err = -ENAMETOOLONG;
269	if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
270	"%s(%s)", tmpl->name, alg->cra_name) >=
271	CRYPTO_MAX_ALG_NAME)
272	goto err_drop_alg;
273	if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
274	"%s(%s)", tmpl->name, alg->cra_driver_name) >=
275	CRYPTO_MAX_ALG_NAME)
276	goto err_drop_alg;
277	}
278
279	inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD \| CRYPTO_ALG_GENIV;
280	inst->alg.cra_flags \|= alg->cra_flags & CRYPTO_ALG_ASYNC;
281	inst->alg.cra_priority = alg->cra_priority;
282	inst->alg.cra_blocksize = alg->cra_blocksize;
283	inst->alg.cra_alignmask = alg->cra_alignmask;
284	inst->alg.cra_type = &crypto_aead_type;
285
286	inst->alg.cra_aead.ivsize = alg->cra_aead.ivsize;
287	inst->alg.cra_aead.maxauthsize = alg->cra_aead.maxauthsize;
288	inst->alg.cra_aead.geniv = alg->cra_aead.geniv;
289
290	inst->alg.cra_aead.setkey = alg->cra_aead.setkey;
291	inst->alg.cra_aead.setauthsize = alg->cra_aead.setauthsize;
292	inst->alg.cra_aead.encrypt = alg->cra_aead.encrypt;
293	inst->alg.cra_aead.decrypt = alg->cra_aead.decrypt;
294
295	out:
296	return inst;
297
298	err_drop_alg:
299	crypto_drop_aead(spawn);
300	err_free_inst:
301	kfree(inst);
302	inst = ERR_PTR(err);
303	goto out;
304	}
305	EXPORT_SYMBOL_GPL(aead_geniv_alloc);
306
307	void aead_geniv_free(struct crypto_instance *inst)
308	{
309	crypto_drop_aead(crypto_instance_ctx(inst));
310	kfree(inst);
311	}
312	EXPORT_SYMBOL_GPL(aead_geniv_free);
313
314	int aead_geniv_init(struct crypto_tfm *tfm)
315	{
316	struct crypto_instance inst = (void )tfm->__crt_alg;
317	struct crypto_aead *aead;
318
319	aead = crypto_spawn_aead(crypto_instance_ctx(inst));
320	if (IS_ERR(aead))
321	return PTR_ERR(aead);
322
323	tfm->crt_aead.base = aead;
324	tfm->crt_aead.reqsize += crypto_aead_reqsize(aead);
325
326	return 0;
327	}
328	EXPORT_SYMBOL_GPL(aead_geniv_init);
329
330	void aead_geniv_exit(struct crypto_tfm *tfm)
331	{
332	crypto_free_aead(tfm->crt_aead.base);
333	}
334	EXPORT_SYMBOL_GPL(aead_geniv_exit);
335
d29ce988 HX	336	static int crypto_nivaead_default(struct crypto_alg *alg, u32 type, u32 mask)
	337	{
	338	struct rtattr *tb[3];
	339	struct {
	340	struct rtattr attr;
	341	struct crypto_attr_type data;
	342	} ptype;
	343	struct {
	344	struct rtattr attr;
	345	struct crypto_attr_alg data;
	346	} palg;
	347	struct crypto_template *tmpl;
	348	struct crypto_instance *inst;
	349	struct crypto_alg *larval;
	350	const char *geniv;
	351	int err;
	352
	353	larval = crypto_larval_lookup(alg->cra_driver_name,
	354	CRYPTO_ALG_TYPE_AEAD \| CRYPTO_ALG_GENIV,
	355	CRYPTO_ALG_TYPE_MASK \| CRYPTO_ALG_GENIV);
	356	err = PTR_ERR(larval);
	357	if (IS_ERR(larval))
	358	goto out;
	359
	360	err = -EAGAIN;
	361	if (!crypto_is_larval(larval))
	362	goto drop_larval;
	363
	364	ptype.attr.rta_len = sizeof(ptype);
	365	ptype.attr.rta_type = CRYPTOA_TYPE;
	366	ptype.data.type = type \| CRYPTO_ALG_GENIV;
	367	/* GENIV tells the template that we're making a default geniv. */
	368	ptype.data.mask = mask \| CRYPTO_ALG_GENIV;
	369	tb[0] = &ptype.attr;
	370
	371	palg.attr.rta_len = sizeof(palg);
	372	palg.attr.rta_type = CRYPTOA_ALG;
	373	/* Must use the exact name to locate ourselves. */
	374	memcpy(palg.data.name, alg->cra_driver_name, CRYPTO_MAX_ALG_NAME);
	375	tb[1] = &palg.attr;
	376
	377	tb[2] = NULL;
	378
	379	geniv = alg->cra_aead.geniv;
	380
	381	tmpl = crypto_lookup_template(geniv);
	382	err = -ENOENT;
	383	if (!tmpl)
	384	goto kill_larval;
	385
	386	inst = tmpl->alloc(tb);
	387	err = PTR_ERR(inst);
	388	if (IS_ERR(inst))
	389	goto put_tmpl;
	390
	391	if ((err = crypto_register_instance(tmpl, inst))) {
	392	tmpl->free(inst);
	393	goto put_tmpl;
	394	}
	395
	396	/* Redo the lookup to use the instance we just registered. */
	397	err = -EAGAIN;
	398
	399	put_tmpl:
400	crypto_tmpl_put(tmpl);
401	kill_larval:
402	crypto_larval_kill(larval);
403	drop_larval:
404	crypto_mod_put(larval);
405	out:
406	crypto_mod_put(alg);
407	return err;
408	}
409
410	static struct crypto_alg crypto_lookup_aead(const char name, u32 type,
411	u32 mask)
412	{
413	struct crypto_alg *alg;
414
415	alg = crypto_alg_mod_lookup(name, type, mask);
416	if (IS_ERR(alg))
417	return alg;
418
419	if (alg->cra_type == &crypto_aead_type)
420	return alg;
421
422	if (!alg->cra_aead.ivsize)
423	return alg;
424
425	return ERR_PTR(crypto_nivaead_default(alg, type, mask));
426	}
427
428	int crypto_grab_aead(struct crypto_aead_spawn spawn, const char name,
429	u32 type, u32 mask)
430	{
431	struct crypto_alg *alg;
432	int err;
433
434	type &= ~(CRYPTO_ALG_TYPE_MASK \| CRYPTO_ALG_GENIV);
435	type \|= CRYPTO_ALG_TYPE_AEAD;
436	mask &= ~(CRYPTO_ALG_TYPE_MASK \| CRYPTO_ALG_GENIV);
437	mask \|= CRYPTO_ALG_TYPE_MASK;
438
439	alg = crypto_lookup_aead(name, type, mask);
440	if (IS_ERR(alg))
441	return PTR_ERR(alg);
442
443	err = crypto_init_spawn(&spawn->base, alg, spawn->base.inst, mask);
444	crypto_mod_put(alg);
445	return err;
446	}
447	EXPORT_SYMBOL_GPL(crypto_grab_aead);
448
449	struct crypto_aead crypto_alloc_aead(const char alg_name, u32 type, u32 mask)
450	{
451	struct crypto_tfm *tfm;
452	int err;
453
454	type &= ~(CRYPTO_ALG_TYPE_MASK \| CRYPTO_ALG_GENIV);
455	type \|= CRYPTO_ALG_TYPE_AEAD;
456	mask &= ~(CRYPTO_ALG_TYPE_MASK \| CRYPTO_ALG_GENIV);
457	mask \|= CRYPTO_ALG_TYPE_MASK;
458
459	for (;;) {
460	struct crypto_alg *alg;
461
462	alg = crypto_lookup_aead(alg_name, type, mask);
463	if (IS_ERR(alg)) {
464	err = PTR_ERR(alg);
465	goto err;
466	}
467
468	tfm = __crypto_alloc_tfm(alg, type, mask);
469	if (!IS_ERR(tfm))
470	return __crypto_aead_cast(tfm);
471
472	crypto_mod_put(alg);
473	err = PTR_ERR(tfm);
474
475	err:
476	if (err != -EAGAIN)
477	break;
478	if (signal_pending(current)) {
479	err = -EINTR;
480	break;
481	}
482	}
483
484	return ERR_PTR(err);
485	}
486	EXPORT_SYMBOL_GPL(crypto_alloc_aead);
487
1ae97820 HX	488	MODULE_LICENSE("GPL");
1ae97820 HX	489	MODULE_DESCRIPTION("Authenticated Encryption with Associated Data (AEAD)");