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crypto: skcipher - Remove top-level givcipher interface

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This patch removes the old crypto_grab_skcipher helper and replaces
it with crypto_grab_skcipher2.

As this is the final entry point into givcipher this patch also
removes all traces of the top-level givcipher interface, including
all implicit IV generators such as chainiv.

The bottom-level givcipher interface remains until the drivers
using it are converted.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2016-07-12 13:17:50 +08:00
parent 6cf80a2965
commit 3a01d0ee2b
10 changed files with 22 additions and 1278 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
crypto/Makefile
View File

@ -20,8 +20,6 @@ crypto_blkcipher-y := ablkcipher.o
crypto_blkcipher-y += blkcipher.o
crypto_blkcipher-y += skcipher.o
obj-$(CONFIG_CRYPTO_BLKCIPHER2) += crypto_blkcipher.o
obj-$(CONFIG_CRYPTO_BLKCIPHER2) += chainiv.o
obj-$(CONFIG_CRYPTO_BLKCIPHER2) += eseqiv.o
obj-$(CONFIG_CRYPTO_SEQIV) += seqiv.o
obj-$(CONFIG_CRYPTO_ECHAINIV) += echainiv.o

222
crypto/ablkcipher.c
View File

@ -16,8 +16,6 @@
#include <crypto/internal/skcipher.h>
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/rtnetlink.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/seq_file.h>
#include <linux/cryptouser.h>
@ -348,16 +346,6 @@ static unsigned int crypto_ablkcipher_ctxsize(struct crypto_alg *alg, u32 type,
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)
{
@ -370,10 +358,6 @@ static int crypto_init_ablkcipher_ops(struct crypto_tfm *tfm, u32 type,
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;
@ -435,11 +419,6 @@ const struct crypto_type crypto_ablkcipher_type = {
};
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)
{
@ -453,8 +432,6 @@ static int crypto_init_givcipher_ops(struct crypto_tfm *tfm, u32 type,
alg->setkey : setkey;
crt->encrypt = alg->encrypt;
crt->decrypt = alg->decrypt;
crt->givencrypt = alg->givencrypt ?: no_givdecrypt;
crt->givdecrypt = alg->givdecrypt ?: no_givdecrypt;
crt->base = __crypto_ablkcipher_cast(tfm);
crt->ivsize = alg->ivsize;
@ -515,202 +492,3 @@ const struct crypto_type crypto_givcipher_type = {
.report = crypto_givcipher_report,
};
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 "eseqiv";
}
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;
if (tmpl->create) {
err = tmpl->create(tmpl, tb);
if (err)
goto put_tmpl;
goto ok;
}
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;
}
ok:
/* 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_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));
}
EXPORT_SYMBOL_GPL(crypto_lookup_skcipher);
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 (fatal_signal_pending(current)) {
err = -EINTR;
break;
}
}
return ERR_PTR(err);
}
EXPORT_SYMBOL_GPL(crypto_alloc_ablkcipher);

185
crypto/blkcipher.c
View File

@ -21,7 +21,6 @@
#include <linux/hardirq.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/scatterlist.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/string.h>
@ -466,10 +465,6 @@ static int crypto_init_blkcipher_ops_async(struct crypto_tfm *tfm)
crt->setkey = async_setkey;
crt->encrypt = async_encrypt;
crt->decrypt = async_decrypt;
if (!alg->ivsize) {
crt->givencrypt = skcipher_null_givencrypt;
crt->givdecrypt = skcipher_null_givdecrypt;
}
crt->base = __crypto_ablkcipher_cast(tfm);
crt->ivsize = alg->ivsize;
@ -560,185 +555,5 @@ const struct crypto_type crypto_blkcipher_type = {
};
EXPORT_SYMBOL_GPL(crypto_blkcipher_type);
static int crypto_grab_nivcipher(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)| 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 *skcipher_geniv_alloc(struct crypto_template *tmpl,
struct rtattr **tb, u32 type,
u32 mask)
{
struct {
int (*setkey)(struct crypto_ablkcipher *tfm, const u8 *key,
unsigned int keylen);
int (*encrypt)(struct ablkcipher_request *req);
int (*decrypt)(struct ablkcipher_request *req);
unsigned int min_keysize;
unsigned int max_keysize;
unsigned int ivsize;
const char *geniv;
} balg;
const char *name;
struct crypto_skcipher_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_GIVCIPHER | 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_skcipher_spawn(spawn, inst);
err = crypto_grab_nivcipher(spawn, name, type, mask);
if (err)
goto err_free_inst;
alg = crypto_skcipher_spawn_alg(spawn);
if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
CRYPTO_ALG_TYPE_BLKCIPHER) {
balg.ivsize = alg->cra_blkcipher.ivsize;
balg.min_keysize = alg->cra_blkcipher.min_keysize;
balg.max_keysize = alg->cra_blkcipher.max_keysize;
balg.setkey = async_setkey;
balg.encrypt = async_encrypt;
balg.decrypt = async_decrypt;
balg.geniv = alg->cra_blkcipher.geniv;
} else {
balg.ivsize = alg->cra_ablkcipher.ivsize;
balg.min_keysize = alg->cra_ablkcipher.min_keysize;
balg.max_keysize = alg->cra_ablkcipher.max_keysize;
balg.setkey = alg->cra_ablkcipher.setkey;
balg.encrypt = alg->cra_ablkcipher.encrypt;
balg.decrypt = alg->cra_ablkcipher.decrypt;
balg.geniv = alg->cra_ablkcipher.geniv;
}
err = -EINVAL;
if (!balg.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 (!balg.geniv)
balg.geniv = crypto_default_geniv(alg);
err = -EAGAIN;
if (strcmp(tmpl->name, balg.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_GIVCIPHER | 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_givcipher_type;
inst->alg.cra_ablkcipher.ivsize = balg.ivsize;
inst->alg.cra_ablkcipher.min_keysize = balg.min_keysize;
inst->alg.cra_ablkcipher.max_keysize = balg.max_keysize;
inst->alg.cra_ablkcipher.geniv = balg.geniv;
inst->alg.cra_ablkcipher.setkey = balg.setkey;
inst->alg.cra_ablkcipher.encrypt = balg.encrypt;
inst->alg.cra_ablkcipher.decrypt = balg.decrypt;
out:
return inst;
err_drop_alg:
crypto_drop_skcipher(spawn);
err_free_inst:
kfree(inst);
inst = ERR_PTR(err);
goto out;
}
EXPORT_SYMBOL_GPL(skcipher_geniv_alloc);
void skcipher_geniv_free(struct crypto_instance *inst)
{
crypto_drop_skcipher(crypto_instance_ctx(inst));
kfree(inst);
}
EXPORT_SYMBOL_GPL(skcipher_geniv_free);
int skcipher_geniv_init(struct crypto_tfm *tfm)
{
struct crypto_instance *inst = (void *)tfm->__crt_alg;
struct crypto_ablkcipher *cipher;
cipher = crypto_spawn_skcipher(crypto_instance_ctx(inst));
if (IS_ERR(cipher))
return PTR_ERR(cipher);
tfm->crt_ablkcipher.base = cipher;
tfm->crt_ablkcipher.reqsize += crypto_ablkcipher_reqsize(cipher);
return 0;
}
EXPORT_SYMBOL_GPL(skcipher_geniv_init);
void skcipher_geniv_exit(struct crypto_tfm *tfm)
{
crypto_free_ablkcipher(tfm->crt_ablkcipher.base);
}
EXPORT_SYMBOL_GPL(skcipher_geniv_exit);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Generic block chaining cipher type");

317
crypto/chainiv.c
View File

@ -1,317 +0,0 @@
/*
* chainiv: Chain IV Generator
*
* Generate IVs simply be using the last block of the previous encryption.
* This is mainly useful for CBC with a synchronous algorithm.
*
* 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/skcipher.h>
#include <crypto/rng.h>
#include <crypto/crypto_wq.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/string.h>
#include <linux/workqueue.h>
enum {
CHAINIV_STATE_INUSE = 0,
};
struct chainiv_ctx {
spinlock_t lock;
char iv[];
};
struct async_chainiv_ctx {
unsigned long state;
spinlock_t lock;
int err;
struct crypto_queue queue;
struct work_struct postponed;
char iv[];
};
static int chainiv_givencrypt(struct skcipher_givcrypt_request *req)
{
struct crypto_ablkcipher *geniv = skcipher_givcrypt_reqtfm(req);
struct chainiv_ctx *ctx = crypto_ablkcipher_ctx(geniv);
struct ablkcipher_request *subreq = skcipher_givcrypt_reqctx(req);
unsigned int ivsize;
int err;
ablkcipher_request_set_tfm(subreq, skcipher_geniv_cipher(geniv));
ablkcipher_request_set_callback(subreq, req->creq.base.flags &
~CRYPTO_TFM_REQ_MAY_SLEEP,
req->creq.base.complete,
req->creq.base.data);
ablkcipher_request_set_crypt(subreq, req->creq.src, req->creq.dst,
req->creq.nbytes, req->creq.info);
spin_lock_bh(&ctx->lock);
ivsize = crypto_ablkcipher_ivsize(geniv);
memcpy(req->giv, ctx->iv, ivsize);
memcpy(subreq->info, ctx->iv, ivsize);
err = crypto_ablkcipher_encrypt(subreq);
if (err)
goto unlock;
memcpy(ctx->iv, subreq->info, ivsize);
unlock:
spin_unlock_bh(&ctx->lock);
return err;
}
static int chainiv_init_common(struct crypto_tfm *tfm, char iv[])
{
struct crypto_ablkcipher *geniv = __crypto_ablkcipher_cast(tfm);
int err = 0;
tfm->crt_ablkcipher.reqsize = sizeof(struct ablkcipher_request);
if (iv) {
err = crypto_rng_get_bytes(crypto_default_rng, iv,
crypto_ablkcipher_ivsize(geniv));
crypto_put_default_rng();
}
return err ?: skcipher_geniv_init(tfm);
}
static int chainiv_init(struct crypto_tfm *tfm)
{
struct crypto_ablkcipher *geniv = __crypto_ablkcipher_cast(tfm);
struct chainiv_ctx *ctx = crypto_tfm_ctx(tfm);
char *iv;
spin_lock_init(&ctx->lock);
iv = NULL;
if (!crypto_get_default_rng()) {
crypto_ablkcipher_crt(geniv)->givencrypt = chainiv_givencrypt;
iv = ctx->iv;
}
return chainiv_init_common(tfm, iv);
}
static int async_chainiv_schedule_work(struct async_chainiv_ctx *ctx)
{
int queued;
int err = ctx->err;
if (!ctx->queue.qlen) {
smp_mb__before_atomic();
clear_bit(CHAINIV_STATE_INUSE, &ctx->state);
if (!ctx->queue.qlen ||
test_and_set_bit(CHAINIV_STATE_INUSE, &ctx->state))
goto out;
}
queued = queue_work(kcrypto_wq, &ctx->postponed);
BUG_ON(!queued);
out:
return err;
}
static int async_chainiv_postpone_request(struct skcipher_givcrypt_request *req)
{
struct crypto_ablkcipher *geniv = skcipher_givcrypt_reqtfm(req);
struct async_chainiv_ctx *ctx = crypto_ablkcipher_ctx(geniv);
int err;
spin_lock_bh(&ctx->lock);
err = skcipher_enqueue_givcrypt(&ctx->queue, req);
spin_unlock_bh(&ctx->lock);
if (test_and_set_bit(CHAINIV_STATE_INUSE, &ctx->state))
return err;
ctx->err = err;
return async_chainiv_schedule_work(ctx);
}
static int async_chainiv_givencrypt_tail(struct skcipher_givcrypt_request *req)
{
struct crypto_ablkcipher *geniv = skcipher_givcrypt_reqtfm(req);
struct async_chainiv_ctx *ctx = crypto_ablkcipher_ctx(geniv);
struct ablkcipher_request *subreq = skcipher_givcrypt_reqctx(req);
unsigned int ivsize = crypto_ablkcipher_ivsize(geniv);
memcpy(req->giv, ctx->iv, ivsize);
memcpy(subreq->info, ctx->iv, ivsize);
ctx->err = crypto_ablkcipher_encrypt(subreq);
if (ctx->err)
goto out;
memcpy(ctx->iv, subreq->info, ivsize);
out:
return async_chainiv_schedule_work(ctx);
}
static int async_chainiv_givencrypt(struct skcipher_givcrypt_request *req)
{
struct crypto_ablkcipher *geniv = skcipher_givcrypt_reqtfm(req);
struct async_chainiv_ctx *ctx = crypto_ablkcipher_ctx(geniv);
struct ablkcipher_request *subreq = skcipher_givcrypt_reqctx(req);
ablkcipher_request_set_tfm(subreq, skcipher_geniv_cipher(geniv));
ablkcipher_request_set_callback(subreq, req->creq.base.flags,
req->creq.base.complete,
req->creq.base.data);
ablkcipher_request_set_crypt(subreq, req->creq.src, req->creq.dst,
req->creq.nbytes, req->creq.info);
if (test_and_set_bit(CHAINIV_STATE_INUSE, &ctx->state))
goto postpone;
if (ctx->queue.qlen) {
clear_bit(CHAINIV_STATE_INUSE, &ctx->state);
goto postpone;
}
return async_chainiv_givencrypt_tail(req);
postpone:
return async_chainiv_postpone_request(req);
}
static void async_chainiv_do_postponed(struct work_struct *work)
{
struct async_chainiv_ctx *ctx = container_of(work,
struct async_chainiv_ctx,
postponed);
struct skcipher_givcrypt_request *req;
struct ablkcipher_request *subreq;
int err;
/* Only handle one request at a time to avoid hogging keventd. */
spin_lock_bh(&ctx->lock);
req = skcipher_dequeue_givcrypt(&ctx->queue);
spin_unlock_bh(&ctx->lock);
if (!req) {
async_chainiv_schedule_work(ctx);
return;
}
subreq = skcipher_givcrypt_reqctx(req);
subreq->base.flags |= CRYPTO_TFM_REQ_MAY_SLEEP;
err = async_chainiv_givencrypt_tail(req);
local_bh_disable();
skcipher_givcrypt_complete(req, err);
local_bh_enable();
}
static int async_chainiv_init(struct crypto_tfm *tfm)
{
struct crypto_ablkcipher *geniv = __crypto_ablkcipher_cast(tfm);
struct async_chainiv_ctx *ctx = crypto_tfm_ctx(tfm);
char *iv;
spin_lock_init(&ctx->lock);
crypto_init_queue(&ctx->queue, 100);
INIT_WORK(&ctx->postponed, async_chainiv_do_postponed);
iv = NULL;
if (!crypto_get_default_rng()) {
crypto_ablkcipher_crt(geniv)->givencrypt =
async_chainiv_givencrypt;
iv = ctx->iv;
}
return chainiv_init_common(tfm, iv);
}
static void async_chainiv_exit(struct crypto_tfm *tfm)
{
struct async_chainiv_ctx *ctx = crypto_tfm_ctx(tfm);
BUG_ON(test_bit(CHAINIV_STATE_INUSE, &ctx->state) || ctx->queue.qlen);
skcipher_geniv_exit(tfm);
}
static struct crypto_template chainiv_tmpl;
static struct crypto_instance *chainiv_alloc(struct rtattr **tb)
{
struct crypto_attr_type *algt;
struct crypto_instance *inst;
algt = crypto_get_attr_type(tb);
if (IS_ERR(algt))
return ERR_CAST(algt);
inst = skcipher_geniv_alloc(&chainiv_tmpl, tb, 0, 0);
if (IS_ERR(inst))
goto out;
inst->alg.cra_init = chainiv_init;
inst->alg.cra_exit = skcipher_geniv_exit;
inst->alg.cra_ctxsize = sizeof(struct chainiv_ctx);
if (!crypto_requires_sync(algt->type, algt->mask)) {
inst->alg.cra_flags |= CRYPTO_ALG_ASYNC;
inst->alg.cra_init = async_chainiv_init;
inst->alg.cra_exit = async_chainiv_exit;
inst->alg.cra_ctxsize = sizeof(struct async_chainiv_ctx);
}
inst->alg.cra_ctxsize += inst->alg.cra_ablkcipher.ivsize;
out:
return inst;
}
static struct crypto_template chainiv_tmpl = {
.name = "chainiv",
.alloc = chainiv_alloc,
.free = skcipher_geniv_free,
.module = THIS_MODULE,
};
static int __init chainiv_module_init(void)
{
return crypto_register_template(&chainiv_tmpl);
}
static void chainiv_module_exit(void)
{
crypto_unregister_template(&chainiv_tmpl);
}
module_init(chainiv_module_init);
module_exit(chainiv_module_exit);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Chain IV Generator");
MODULE_ALIAS_CRYPTO("chainiv");

242
crypto/eseqiv.c
View File

@ -1,242 +0,0 @@
/*
* eseqiv: Encrypted Sequence Number IV Generator
*
* This generator generates an IV based on a sequence number by xoring it
* with a salt and then encrypting it with the same key as used to encrypt
* the plain text. This algorithm requires that the block size be equal
* to the IV size. It is mainly useful for CBC.
*
* 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/skcipher.h>
#include <crypto/rng.h>
#include <crypto/scatterwalk.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/scatterlist.h>
#include <linux/spinlock.h>
#include <linux/string.h>
struct eseqiv_request_ctx {
struct scatterlist src[2];
struct scatterlist dst[2];
char tail[];
};
struct eseqiv_ctx {
spinlock_t lock;
unsigned int reqoff;
char salt[];
};
static void eseqiv_complete2(struct skcipher_givcrypt_request *req)
{
struct crypto_ablkcipher *geniv = skcipher_givcrypt_reqtfm(req);
struct eseqiv_request_ctx *reqctx = skcipher_givcrypt_reqctx(req);
memcpy(req->giv, PTR_ALIGN((u8 *)reqctx->tail,
crypto_ablkcipher_alignmask(geniv) + 1),
crypto_ablkcipher_ivsize(geniv));
}
static void eseqiv_complete(struct crypto_async_request *base, int err)
{
struct skcipher_givcrypt_request *req = base->data;
if (err)
goto out;
eseqiv_complete2(req);
out:
skcipher_givcrypt_complete(req, err);
}
static int eseqiv_givencrypt(struct skcipher_givcrypt_request *req)
{
struct crypto_ablkcipher *geniv = skcipher_givcrypt_reqtfm(req);
struct eseqiv_ctx *ctx = crypto_ablkcipher_ctx(geniv);
struct eseqiv_request_ctx *reqctx = skcipher_givcrypt_reqctx(req);
struct ablkcipher_request *subreq;
crypto_completion_t compl;
void *data;
struct scatterlist *osrc, *odst;
struct scatterlist *dst;
struct page *srcp;
struct page *dstp;
u8 *giv;
u8 *vsrc;
u8 *vdst;
__be64 seq;
unsigned int ivsize;
unsigned int len;
int err;
subreq = (void *)(reqctx->tail + ctx->reqoff);
ablkcipher_request_set_tfm(subreq, skcipher_geniv_cipher(geniv));
giv = req->giv;
compl = req->creq.base.complete;
data = req->creq.base.data;
osrc = req->creq.src;
odst = req->creq.dst;
srcp = sg_page(osrc);
dstp = sg_page(odst);
vsrc = PageHighMem(srcp) ? NULL : page_address(srcp) + osrc->offset;
vdst = PageHighMem(dstp) ? NULL : page_address(dstp) + odst->offset;
ivsize = crypto_ablkcipher_ivsize(geniv);
if (vsrc != giv + ivsize && vdst != giv + ivsize) {
giv = PTR_ALIGN((u8 *)reqctx->tail,
crypto_ablkcipher_alignmask(geniv) + 1);
compl = eseqiv_complete;
data = req;
}
ablkcipher_request_set_callback(subreq, req->creq.base.flags, compl,
data);
sg_init_table(reqctx->src, 2);
sg_set_buf(reqctx->src, giv, ivsize);
scatterwalk_crypto_chain(reqctx->src, osrc, vsrc == giv + ivsize, 2);
dst = reqctx->src;
if (osrc != odst) {
sg_init_table(reqctx->dst, 2);
sg_set_buf(reqctx->dst, giv, ivsize);
scatterwalk_crypto_chain(reqctx->dst, odst, vdst == giv + ivsize, 2);
dst = reqctx->dst;
}
ablkcipher_request_set_crypt(subreq, reqctx->src, dst,
req->creq.nbytes + ivsize,
req->creq.info);
memcpy(req->creq.info, ctx->salt, ivsize);
len = ivsize;
if (ivsize > sizeof(u64)) {
memset(req->giv, 0, ivsize - sizeof(u64));
len = sizeof(u64);
}
seq = cpu_to_be64(req->seq);
memcpy(req->giv + ivsize - len, &seq, len);
err = crypto_ablkcipher_encrypt(subreq);
if (err)
goto out;
if (giv != req->giv)
eseqiv_complete2(req);
out:
return err;
}
static int eseqiv_init(struct crypto_tfm *tfm)
{
struct crypto_ablkcipher *geniv = __crypto_ablkcipher_cast(tfm);
struct eseqiv_ctx *ctx = crypto_ablkcipher_ctx(geniv);
unsigned long alignmask;
unsigned int reqsize;
int err;
spin_lock_init(&ctx->lock);
alignmask = crypto_tfm_ctx_alignment() - 1;
reqsize = sizeof(struct eseqiv_request_ctx);
if (alignmask & reqsize) {
alignmask &= reqsize;
alignmask--;
}
alignmask = ~alignmask;
alignmask &= crypto_ablkcipher_alignmask(geniv);
reqsize += alignmask;
reqsize += crypto_ablkcipher_ivsize(geniv);
reqsize = ALIGN(reqsize, crypto_tfm_ctx_alignment());
ctx->reqoff = reqsize - sizeof(struct eseqiv_request_ctx);
tfm->crt_ablkcipher.reqsize = reqsize +
sizeof(struct ablkcipher_request);
err = 0;
if (!crypto_get_default_rng()) {
crypto_ablkcipher_crt(geniv)->givencrypt = eseqiv_givencrypt;
err = crypto_rng_get_bytes(crypto_default_rng, ctx->salt,
crypto_ablkcipher_ivsize(geniv));
crypto_put_default_rng();
}
return err ?: skcipher_geniv_init(tfm);
}
static struct crypto_template eseqiv_tmpl;
static struct crypto_instance *eseqiv_alloc(struct rtattr **tb)
{
struct crypto_instance *inst;
int err;
inst = skcipher_geniv_alloc(&eseqiv_tmpl, tb, 0, 0);
if (IS_ERR(inst))
goto out;
err = -EINVAL;
if (inst->alg.cra_ablkcipher.ivsize != inst->alg.cra_blocksize)
goto free_inst;
inst->alg.cra_init = eseqiv_init;
inst->alg.cra_exit = skcipher_geniv_exit;
inst->alg.cra_ctxsize = sizeof(struct eseqiv_ctx);
inst->alg.cra_ctxsize += inst->alg.cra_ablkcipher.ivsize;
out:
return inst;
free_inst:
skcipher_geniv_free(inst);
inst = ERR_PTR(err);
goto out;
}
static struct crypto_template eseqiv_tmpl = {
.name = "eseqiv",
.alloc = eseqiv_alloc,
.free = skcipher_geniv_free,
.module = THIS_MODULE,
};
static int __init eseqiv_module_init(void)
{
return crypto_register_template(&eseqiv_tmpl);
}
static void __exit eseqiv_module_exit(void)
{
crypto_unregister_template(&eseqiv_tmpl);
}
module_init(eseqiv_module_init);
module_exit(eseqiv_module_exit);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Encrypted Sequence Number IV Generator");
MODULE_ALIAS_CRYPTO("eseqiv");

162
crypto/seqiv.c
View File

@ -14,50 +14,17 @@
*/
#include <crypto/internal/geniv.h>
#include <crypto/internal/skcipher.h>
#include <crypto/rng.h>
#include <crypto/scatterwalk.h>
#include <crypto/skcipher.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/string.h>
struct seqiv_ctx {
spinlock_t lock;
u8 salt[] __attribute__ ((aligned(__alignof__(u32))));
};
static void seqiv_free(struct crypto_instance *inst);
static void seqiv_complete2(struct skcipher_givcrypt_request *req, int err)
{
struct ablkcipher_request *subreq = skcipher_givcrypt_reqctx(req);
struct crypto_ablkcipher *geniv;
if (err == -EINPROGRESS)
return;
if (err)
goto out;
geniv = skcipher_givcrypt_reqtfm(req);
memcpy(req->creq.info, subreq->info, crypto_ablkcipher_ivsize(geniv));
out:
kfree(subreq->info);
}
static void seqiv_complete(struct crypto_async_request *base, int err)
{
struct skcipher_givcrypt_request *req = base->data;
seqiv_complete2(req, err);
skcipher_givcrypt_complete(req, err);
}
static void seqiv_aead_encrypt_complete2(struct aead_request *req, int err)
{
struct aead_request *subreq = aead_request_ctx(req);
@ -85,65 +52,6 @@ static void seqiv_aead_encrypt_complete(struct crypto_async_request *base,
aead_request_complete(req, err);
}
static void seqiv_geniv(struct seqiv_ctx *ctx, u8 *info, u64 seq,
unsigned int ivsize)
{
unsigned int len = ivsize;
if (ivsize > sizeof(u64)) {
memset(info, 0, ivsize - sizeof(u64));
len = sizeof(u64);
}
seq = cpu_to_be64(seq);
memcpy(info + ivsize - len, &seq, len);
crypto_xor(info, ctx->salt, ivsize);
}
static int seqiv_givencrypt(struct skcipher_givcrypt_request *req)
{
struct crypto_ablkcipher *geniv = skcipher_givcrypt_reqtfm(req);
struct seqiv_ctx *ctx = crypto_ablkcipher_ctx(geniv);
struct ablkcipher_request *subreq = skcipher_givcrypt_reqctx(req);
crypto_completion_t compl;
void *data;
u8 *info;
unsigned int ivsize;
int err;
ablkcipher_request_set_tfm(subreq, skcipher_geniv_cipher(geniv));
compl = req->creq.base.complete;
data = req->creq.base.data;
info = req->creq.info;
ivsize = crypto_ablkcipher_ivsize(geniv);
if (unlikely(!IS_ALIGNED((unsigned long)info,
crypto_ablkcipher_alignmask(geniv) + 1))) {
info = kmalloc(ivsize, req->creq.base.flags &
CRYPTO_TFM_REQ_MAY_SLEEP ? GFP_KERNEL:
GFP_ATOMIC);
if (!info)
return -ENOMEM;
compl = seqiv_complete;
data = req;
}
ablkcipher_request_set_callback(subreq, req->creq.base.flags, compl,
data);
ablkcipher_request_set_crypt(subreq, req->creq.src, req->creq.dst,
req->creq.nbytes, info);
seqiv_geniv(ctx, info, req->seq, ivsize);
memcpy(req->giv, info, ivsize);
err = crypto_ablkcipher_encrypt(subreq);
if (unlikely(info != req->creq.info))
seqiv_complete2(req, err);
return err;
}
static int seqiv_aead_encrypt(struct aead_request *req)
{
struct crypto_aead *geniv = crypto_aead_reqtfm(req);
@ -233,62 +141,6 @@ static int seqiv_aead_decrypt(struct aead_request *req)
return crypto_aead_decrypt(subreq);
}
static int seqiv_init(struct crypto_tfm *tfm)
{
struct crypto_ablkcipher *geniv = __crypto_ablkcipher_cast(tfm);
struct seqiv_ctx *ctx = crypto_ablkcipher_ctx(geniv);
int err;
spin_lock_init(&ctx->lock);
tfm->crt_ablkcipher.reqsize = sizeof(struct ablkcipher_request);
err = 0;
if (!crypto_get_default_rng()) {
crypto_ablkcipher_crt(geniv)->givencrypt = seqiv_givencrypt;
err = crypto_rng_get_bytes(crypto_default_rng, ctx->salt,
crypto_ablkcipher_ivsize(geniv));
crypto_put_default_rng();
}
return err ?: skcipher_geniv_init(tfm);
}
static int seqiv_ablkcipher_create(struct crypto_template *tmpl,
struct rtattr **tb)
{
struct crypto_instance *inst;
int err;
inst = skcipher_geniv_alloc(tmpl, tb, 0, 0);
if (IS_ERR(inst))
return PTR_ERR(inst);
err = -EINVAL;
if (inst->alg.cra_ablkcipher.ivsize < sizeof(u64))
goto free_inst;
inst->alg.cra_init = seqiv_init;
inst->alg.cra_exit = skcipher_geniv_exit;
inst->alg.cra_ctxsize += inst->alg.cra_ablkcipher.ivsize;
inst->alg.cra_ctxsize += sizeof(struct seqiv_ctx);
inst->alg.cra_alignmask |= __alignof__(u32) - 1;
err = crypto_register_instance(tmpl, inst);
if (err)
goto free_inst;
out:
return err;
free_inst:
skcipher_geniv_free(inst);
goto out;
}
static int seqiv_aead_create(struct crypto_template *tmpl, struct rtattr **tb)
{
struct aead_instance *inst;
@ -334,26 +186,20 @@ free_inst:
static int seqiv_create(struct crypto_template *tmpl, struct rtattr **tb)
{
struct crypto_attr_type *algt;
int err;
algt = crypto_get_attr_type(tb);
if (IS_ERR(algt))
return PTR_ERR(algt);
if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & CRYPTO_ALG_TYPE_MASK)
err = seqiv_ablkcipher_create(tmpl, tb);
else
err = seqiv_aead_create(tmpl, tb);
return -EINVAL;
return err;
return seqiv_aead_create(tmpl, tb);
}
static void seqiv_free(struct crypto_instance *inst)
{
if ((inst->alg.cra_flags ^ CRYPTO_ALG_TYPE_AEAD) & CRYPTO_ALG_TYPE_MASK)
skcipher_geniv_free(inst);
else
aead_geniv_free(aead_instance(inst));
aead_geniv_free(aead_instance(inst));
}
static struct crypto_template seqiv_tmpl = {

4
crypto/skcipher.c
View File

@ -325,13 +325,13 @@ static const struct crypto_type crypto_skcipher_type2 = {
.tfmsize = offsetof(struct crypto_skcipher, base),
};
int crypto_grab_skcipher2(struct crypto_skcipher_spawn *spawn,
int crypto_grab_skcipher(struct crypto_skcipher_spawn *spawn,
const char *name, u32 type, u32 mask)
{
spawn->base.frontend = &crypto_skcipher_type2;
return crypto_grab_spawn(&spawn->base, name, type, mask);
}
EXPORT_SYMBOL_GPL(crypto_grab_skcipher2);
EXPORT_SYMBOL_GPL(crypto_grab_skcipher);
struct crypto_skcipher *crypto_alloc_skcipher(const char *alg_name,
u32 type, u32 mask)

71
include/crypto/internal/skcipher.h
View File

@ -67,8 +67,12 @@ static inline void crypto_set_skcipher_spawn(
int crypto_grab_skcipher(struct crypto_skcipher_spawn *spawn, const char *name,
u32 type, u32 mask);
int crypto_grab_skcipher2(struct crypto_skcipher_spawn *spawn,
const char *name, u32 type, u32 mask);
static inline int crypto_grab_skcipher2(struct crypto_skcipher_spawn *spawn,
const char *name, u32 type, u32 mask)
{
return crypto_grab_skcipher(spawn, name, type, mask);
}
struct crypto_alg *crypto_lookup_skcipher(const char *name, u32 type, u32 mask);
@ -77,30 +81,28 @@ static inline void crypto_drop_skcipher(struct crypto_skcipher_spawn *spawn)
crypto_drop_spawn(&spawn->base);
}
static inline struct crypto_alg *crypto_skcipher_spawn_alg(
struct crypto_skcipher_spawn *spawn)
{
return spawn->base.alg;
}
static inline struct skcipher_alg *crypto_spawn_skcipher_alg(
static inline struct skcipher_alg *crypto_skcipher_spawn_alg(
struct crypto_skcipher_spawn *spawn)
{
return container_of(spawn->base.alg, struct skcipher_alg, base);
}
static inline struct crypto_ablkcipher *crypto_spawn_skcipher(
static inline struct skcipher_alg *crypto_spawn_skcipher_alg(
struct crypto_skcipher_spawn *spawn)
{
return __crypto_ablkcipher_cast(
crypto_spawn_tfm(&spawn->base, crypto_skcipher_type(0),
crypto_skcipher_mask(0)));
return crypto_skcipher_spawn_alg(spawn);
}
static inline struct crypto_skcipher *crypto_spawn_skcipher(
struct crypto_skcipher_spawn *spawn)
{
return crypto_spawn_tfm2(&spawn->base);
}
static inline struct crypto_skcipher *crypto_spawn_skcipher2(
struct crypto_skcipher_spawn *spawn)
{
return crypto_spawn_tfm2(&spawn->base);
return crypto_spawn_skcipher(spawn);
}
static inline void crypto_skcipher_set_reqsize(
@ -116,53 +118,12 @@ void crypto_unregister_skciphers(struct skcipher_alg *algs, int count);
int skcipher_register_instance(struct crypto_template *tmpl,
struct skcipher_instance *inst);
int skcipher_null_givencrypt(struct skcipher_givcrypt_request *req);
int skcipher_null_givdecrypt(struct skcipher_givcrypt_request *req);
const char *crypto_default_geniv(const struct crypto_alg *alg);
struct crypto_instance *skcipher_geniv_alloc(struct crypto_template *tmpl,
struct rtattr **tb, u32 type,
u32 mask);
void skcipher_geniv_free(struct crypto_instance *inst);
int skcipher_geniv_init(struct crypto_tfm *tfm);
void skcipher_geniv_exit(struct crypto_tfm *tfm);
static inline struct crypto_ablkcipher *skcipher_geniv_cipher(
struct crypto_ablkcipher *geniv)
{
return crypto_ablkcipher_crt(geniv)->base;
}
static inline int skcipher_enqueue_givcrypt(
struct crypto_queue *queue, struct skcipher_givcrypt_request *request)
{
return ablkcipher_enqueue_request(queue, &request->creq);
}
static inline struct skcipher_givcrypt_request *skcipher_dequeue_givcrypt(
struct crypto_queue *queue)
{
return skcipher_givcrypt_cast(crypto_dequeue_request(queue));
}
static inline void *skcipher_givcrypt_reqctx(
struct skcipher_givcrypt_request *req)
{
return ablkcipher_request_ctx(&req->creq);
}
static inline void ablkcipher_request_complete(struct ablkcipher_request *req,
int err)
{
req->base.complete(&req->base, err);
}
static inline void skcipher_givcrypt_complete(
struct skcipher_givcrypt_request *req, int err)
{
ablkcipher_request_complete(&req->creq, err);
}
static inline u32 ablkcipher_request_flags(struct ablkcipher_request *req)
{
return req->base.flags;

76
include/crypto/skcipher.h
View File

@ -139,82 +139,6 @@ struct skcipher_alg {
crypto_skcipher_reqsize(tfm)] CRYPTO_MINALIGN_ATTR; \
struct skcipher_request *name = (void *)__##name##_desc
static inline struct crypto_ablkcipher *skcipher_givcrypt_reqtfm(
struct skcipher_givcrypt_request *req)
{
return crypto_ablkcipher_reqtfm(&req->creq);
}
static inline int crypto_skcipher_givencrypt(
struct skcipher_givcrypt_request *req)
{
struct ablkcipher_tfm *crt =
crypto_ablkcipher_crt(skcipher_givcrypt_reqtfm(req));
return crt->givencrypt(req);
};
static inline int crypto_skcipher_givdecrypt(
struct skcipher_givcrypt_request *req)
{
struct ablkcipher_tfm *crt =
crypto_ablkcipher_crt(skcipher_givcrypt_reqtfm(req));
return crt->givdecrypt(req);
};
static inline void skcipher_givcrypt_set_tfm(
struct skcipher_givcrypt_request *req, struct crypto_ablkcipher *tfm)
{
req->creq.base.tfm = crypto_ablkcipher_tfm(tfm);
}
static inline struct skcipher_givcrypt_request *skcipher_givcrypt_cast(
struct crypto_async_request *req)
{
return container_of(ablkcipher_request_cast(req),
struct skcipher_givcrypt_request, creq);
}
static inline struct skcipher_givcrypt_request *skcipher_givcrypt_alloc(
struct crypto_ablkcipher *tfm, gfp_t gfp)
{
struct skcipher_givcrypt_request *req;
req = kmalloc(sizeof(struct skcipher_givcrypt_request) +
crypto_ablkcipher_reqsize(tfm), gfp);
if (likely(req))
skcipher_givcrypt_set_tfm(req, tfm);
return req;
}
static inline void skcipher_givcrypt_free(struct skcipher_givcrypt_request *req)
{
kfree(req);
}
static inline void skcipher_givcrypt_set_callback(
struct skcipher_givcrypt_request *req, u32 flags,
crypto_completion_t compl, void *data)
{
ablkcipher_request_set_callback(&req->creq, flags, compl, data);
}
static inline void skcipher_givcrypt_set_crypt(
struct skcipher_givcrypt_request *req,
struct scatterlist *src, struct scatterlist *dst,
unsigned int nbytes, void *iv)
{
ablkcipher_request_set_crypt(&req->creq, src, dst, nbytes, iv);
}
static inline void skcipher_givcrypt_set_giv(
struct skcipher_givcrypt_request *req, u8 *giv, u64 seq)
{
req->giv = giv;
req->seq = seq;
}
/**
* DOC: Symmetric Key Cipher API
*

19
include/linux/crypto.h
View File

@ -488,8 +488,6 @@ struct ablkcipher_tfm {
unsigned int keylen);
int (*encrypt)(struct ablkcipher_request *req);
int (*decrypt)(struct ablkcipher_request *req);
int (*givencrypt)(struct skcipher_givcrypt_request *req);
int (*givdecrypt)(struct skcipher_givcrypt_request *req);
struct crypto_ablkcipher *base;
@ -714,23 +712,6 @@ static inline u32 crypto_skcipher_mask(u32 mask)
* state information is unused by the kernel crypto API.
*/
/**
* crypto_alloc_ablkcipher() - allocate asynchronous block cipher handle
* @alg_name: is the cra_name / name or cra_driver_name / driver name of the
* ablkcipher cipher
* @type: specifies the type of the cipher
* @mask: specifies the mask for the cipher
*
* Allocate a cipher handle for an ablkcipher. The returned struct
* crypto_ablkcipher is the cipher handle that is required for any subsequent
* API invocation for that ablkcipher.
*
* Return: allocated cipher handle in case of success; IS_ERR() is true in case
* of an error, PTR_ERR() returns the error code.
*/
struct crypto_ablkcipher *crypto_alloc_ablkcipher(const char *alg_name,
u32 type, u32 mask);
static inline struct crypto_tfm *crypto_ablkcipher_tfm(
struct crypto_ablkcipher *tfm)
{