linux/crypto/aead.c
Herbert Xu 2d0f230fe0 crypto: aead - Rename aead_alg to old_aead_alg
This patch is the first step in the introduction of a new AEAD
alg type.  Unlike normal conversions this patch only renames the
existing aead_alg structure because there are external references
to it.

Those references will be removed after this patch.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2015-05-22 11:25:51 +08:00

557 lines
14 KiB
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 <crypto/scatterwalk.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 <linux/cryptouser.h>
#include <net/netlink.h>
#include "internal.h"
static int aead_null_givencrypt(struct aead_givcrypt_request *req);
static int aead_null_givdecrypt(struct aead_givcrypt_request *req);
static int setkey_unaligned(struct crypto_aead *tfm, const u8 *key,
unsigned int keylen)
{
struct old_aead_alg *aead = crypto_old_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;
}
int crypto_aead_setkey(struct crypto_aead *tfm,
const u8 *key, unsigned int keylen)
{
struct old_aead_alg *aead = crypto_old_aead_alg(tfm);
unsigned long alignmask = crypto_aead_alignmask(tfm);
tfm = tfm->child;
if ((unsigned long)key & alignmask)
return setkey_unaligned(tfm, key, keylen);
return aead->setkey(tfm, key, keylen);
}
EXPORT_SYMBOL_GPL(crypto_aead_setkey);
int crypto_aead_setauthsize(struct crypto_aead *tfm, unsigned int authsize)
{
int err;
if (authsize > crypto_old_aead_alg(tfm)->maxauthsize)
return -EINVAL;
if (crypto_old_aead_alg(tfm)->setauthsize) {
err = crypto_old_aead_alg(tfm)->setauthsize(
tfm->child, authsize);
if (err)
return err;
}
tfm->child->authsize = authsize;
tfm->authsize = authsize;
return 0;
}
EXPORT_SYMBOL_GPL(crypto_aead_setauthsize);
struct aead_old_request {
struct scatterlist srcbuf[2];
struct scatterlist dstbuf[2];
struct aead_request subreq;
};
unsigned int crypto_aead_reqsize(struct crypto_aead *tfm)
{
return tfm->reqsize + sizeof(struct aead_old_request);
}
EXPORT_SYMBOL_GPL(crypto_aead_reqsize);
static int old_crypt(struct aead_request *req,
int (*crypt)(struct aead_request *req))
{
struct aead_old_request *nreq = aead_request_ctx(req);
struct crypto_aead *aead = crypto_aead_reqtfm(req);
struct scatterlist *src, *dst;
if (req->old)
return crypt(req);
src = scatterwalk_ffwd(nreq->srcbuf, req->src,
req->assoclen + req->cryptoff);
dst = scatterwalk_ffwd(nreq->dstbuf, req->dst,
req->assoclen + req->cryptoff);
aead_request_set_tfm(&nreq->subreq, aead);
aead_request_set_callback(&nreq->subreq, aead_request_flags(req),
req->base.complete, req->base.data);
aead_request_set_crypt(&nreq->subreq, src, dst, req->cryptlen,
req->iv);
aead_request_set_assoc(&nreq->subreq, req->src, req->assoclen);
return crypt(&nreq->subreq);
}
static int old_encrypt(struct aead_request *req)
{
struct crypto_aead *aead = crypto_aead_reqtfm(req);
struct old_aead_alg *alg = crypto_old_aead_alg(aead);
return old_crypt(req, alg->encrypt);
}
static int old_decrypt(struct aead_request *req)
{
struct crypto_aead *aead = crypto_aead_reqtfm(req);
struct old_aead_alg *alg = crypto_old_aead_alg(aead);
return old_crypt(req, alg->decrypt);
}
static int no_givcrypt(struct aead_givcrypt_request *req)
{
return -ENOSYS;
}
static int crypto_aead_init_tfm(struct crypto_tfm *tfm)
{
struct old_aead_alg *alg = &tfm->__crt_alg->cra_aead;
struct crypto_aead *crt = __crypto_aead_cast(tfm);
if (max(alg->maxauthsize, alg->ivsize) > PAGE_SIZE / 8)
return -EINVAL;
crt->encrypt = old_encrypt;
crt->decrypt = old_decrypt;
if (alg->ivsize) {
crt->givencrypt = alg->givencrypt ?: no_givcrypt;
crt->givdecrypt = alg->givdecrypt ?: no_givcrypt;
} else {
crt->givencrypt = aead_null_givencrypt;
crt->givdecrypt = aead_null_givdecrypt;
}
crt->child = __crypto_aead_cast(tfm);
crt->ivsize = alg->ivsize;
crt->authsize = alg->maxauthsize;
return 0;
}
#ifdef CONFIG_NET
static int crypto_aead_report(struct sk_buff *skb, struct crypto_alg *alg)
{
struct crypto_report_aead raead;
struct old_aead_alg *aead = &alg->cra_aead;
strncpy(raead.type, "aead", sizeof(raead.type));
strncpy(raead.geniv, aead->geniv ?: "<built-in>", sizeof(raead.geniv));
raead.blocksize = alg->cra_blocksize;
raead.maxauthsize = aead->maxauthsize;
raead.ivsize = aead->ivsize;
if (nla_put(skb, CRYPTOCFGA_REPORT_AEAD,
sizeof(struct crypto_report_aead), &raead))
goto nla_put_failure;
return 0;
nla_put_failure:
return -EMSGSIZE;
}
#else
static int crypto_aead_report(struct sk_buff *skb, struct crypto_alg *alg)
{
return -ENOSYS;
}
#endif
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 old_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 = {
.extsize = crypto_alg_extsize,
.init_tfm = crypto_aead_init_tfm,
#ifdef CONFIG_PROC_FS
.show = crypto_aead_show,
#endif
.report = crypto_aead_report,
.lookup = crypto_lookup_aead,
.maskclear = ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV),
.maskset = CRYPTO_ALG_TYPE_MASK,
.type = CRYPTO_ALG_TYPE_AEAD,
.tfmsize = offsetof(struct crypto_aead, base),
};
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);
}
#ifdef CONFIG_NET
static int crypto_nivaead_report(struct sk_buff *skb, struct crypto_alg *alg)
{
struct crypto_report_aead raead;
struct old_aead_alg *aead = &alg->cra_aead;
strncpy(raead.type, "nivaead", sizeof(raead.type));
strncpy(raead.geniv, aead->geniv, sizeof(raead.geniv));
raead.blocksize = alg->cra_blocksize;
raead.maxauthsize = aead->maxauthsize;
raead.ivsize = aead->ivsize;
if (nla_put(skb, CRYPTOCFGA_REPORT_AEAD,
sizeof(struct crypto_report_aead), &raead))
goto nla_put_failure;
return 0;
nla_put_failure:
return -EMSGSIZE;
}
#else
static int crypto_nivaead_report(struct sk_buff *skb, struct crypto_alg *alg)
{
return -ENOSYS;
}
#endif
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 old_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 = {
.extsize = crypto_alg_extsize,
.init_tfm = crypto_aead_init_tfm,
#ifdef CONFIG_PROC_FS
.show = crypto_nivaead_show,
#endif
.report = crypto_nivaead_report,
.maskclear = ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV),
.maskset = CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV,
.type = CRYPTO_ALG_TYPE_AEAD,
.tfmsize = offsetof(struct crypto_aead, base),
};
EXPORT_SYMBOL_GPL(crypto_nivaead_type);
static int crypto_grab_nivaead(struct crypto_aead_spawn *spawn,
const char *name, u32 type, u32 mask)
{
spawn->base.frontend = &crypto_nivaead_type;
return crypto_grab_spawn(&spawn->base, name, type, mask);
}
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);
if (IS_ERR(algt))
return ERR_CAST(algt);
if ((algt->type ^ (CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_GENIV)) &
algt->mask)
return ERR_PTR(-EINVAL);
name = crypto_attr_alg_name(tb[1]);
if (IS_ERR(name))
return ERR_CAST(name);
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 *child;
struct crypto_aead *aead;
aead = __crypto_aead_cast(tfm);
child = crypto_spawn_aead(crypto_instance_ctx(inst));
if (IS_ERR(child))
return PTR_ERR(child);
aead->child = child;
aead->reqsize += crypto_aead_reqsize(child);
return 0;
}
EXPORT_SYMBOL_GPL(aead_geniv_init);
void aead_geniv_exit(struct crypto_tfm *tfm)
{
crypto_free_aead(__crypto_aead_cast(tfm)->child);
}
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;
err = crypto_register_instance(tmpl, inst);
if (err) {
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;
}
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;
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_type == &crypto_aead_type) {
if (~alg->cra_flags & (type ^ ~mask) & CRYPTO_ALG_TESTED) {
crypto_mod_put(alg);
alg = ERR_PTR(-ENOENT);
}
return alg;
}
BUG_ON(!alg->cra_aead.ivsize);
return ERR_PTR(crypto_nivaead_default(alg, type, mask));
}
EXPORT_SYMBOL_GPL(crypto_lookup_aead);
int crypto_grab_aead(struct crypto_aead_spawn *spawn, const char *name,
u32 type, u32 mask)
{
spawn->base.frontend = &crypto_aead_type;
return crypto_grab_spawn(&spawn->base, name, type, mask);
}
EXPORT_SYMBOL_GPL(crypto_grab_aead);
struct crypto_aead *crypto_alloc_aead(const char *alg_name, u32 type, u32 mask)
{
return crypto_alloc_tfm(alg_name, &crypto_aead_type, type, mask);
}
EXPORT_SYMBOL_GPL(crypto_alloc_aead);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Authenticated Encryption with Associated Data (AEAD)");