From: Eric Biggers <ebiggers@xxxxxxxxxx>
The OFB template just wraps a single block cipher algorithm, so simplify
it by converting it to use skcipher_alloc_instance_simple().
Cc: Gilad Ben-Yossef <gilad@xxxxxxxxxxxxx>
Signed-off-by: Eric Biggers <ebiggers@xxxxxxxxxx>
---
crypto/ofb.c | 119 +++------------------------------------------------
1 file changed, 7 insertions(+), 112 deletions(-)
diff --git a/crypto/ofb.c b/crypto/ofb.c
index cab0b80953fed..34b6e1f426f7a 100644
--- a/crypto/ofb.c
+++ b/crypto/ofb.c
@@ -13,35 +13,11 @@
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
-#include <linux/scatterlist.h>
-#include <linux/slab.h>
-
-struct crypto_ofb_ctx {
- struct crypto_cipher *child;
-};
-
-
-static int crypto_ofb_setkey(struct crypto_skcipher *parent, const u8 *key,
- unsigned int keylen)
-{
- struct crypto_ofb_ctx *ctx = crypto_skcipher_ctx(parent);
- struct crypto_cipher *child = ctx->child;
- int err;
-
- crypto_cipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
- crypto_cipher_set_flags(child, crypto_skcipher_get_flags(parent) &
- CRYPTO_TFM_REQ_MASK);
- err = crypto_cipher_setkey(child, key, keylen);
- crypto_skcipher_set_flags(parent, crypto_cipher_get_flags(child) &
- CRYPTO_TFM_RES_MASK);
- return err;
-}
static int crypto_ofb_crypt(struct skcipher_request *req)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
- struct crypto_ofb_ctx *ctx = crypto_skcipher_ctx(tfm);
- struct crypto_cipher *cipher = ctx->child;
+ struct crypto_cipher *cipher = skcipher_cipher_simple(tfm);
const unsigned int bsize = crypto_cipher_blocksize(cipher);
struct skcipher_walk walk;
int err;
@@ -73,75 +49,15 @@ static int crypto_ofb_crypt(struct skcipher_request *req)
return err;
}
-static int crypto_ofb_init_tfm(struct crypto_skcipher *tfm)
-{
- struct skcipher_instance *inst = skcipher_alg_instance(tfm);
- struct crypto_spawn *spawn = skcipher_instance_ctx(inst);
- struct crypto_ofb_ctx *ctx = crypto_skcipher_ctx(tfm);
- struct crypto_cipher *cipher;
-
- cipher = crypto_spawn_cipher(spawn);
- if (IS_ERR(cipher))
- return PTR_ERR(cipher);
-
- ctx->child = cipher;
- return 0;
-}
-
-static void crypto_ofb_exit_tfm(struct crypto_skcipher *tfm)
-{
- struct crypto_ofb_ctx *ctx = crypto_skcipher_ctx(tfm);
-
- crypto_free_cipher(ctx->child);
-}
-
-static void crypto_ofb_free(struct skcipher_instance *inst)
-{
- crypto_drop_skcipher(skcipher_instance_ctx(inst));
- kfree(inst);
-}
-
static int crypto_ofb_create(struct crypto_template *tmpl, struct rtattr **tb)
{
struct skcipher_instance *inst;
- struct crypto_attr_type *algt;
- struct crypto_spawn *spawn;
struct crypto_alg *alg;
- u32 mask;
int err;
- err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SKCIPHER);
- if (err)
- return err;
-
- inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
- if (!inst)
- return -ENOMEM;
-
- algt = crypto_get_attr_type(tb);
- err = PTR_ERR(algt);
- if (IS_ERR(algt))
- goto err_free_inst;
-
- mask = CRYPTO_ALG_TYPE_MASK |
- crypto_requires_off(algt->type, algt->mask,
- CRYPTO_ALG_NEED_FALLBACK);
-
- alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_CIPHER, mask);
- err = PTR_ERR(alg);
- if (IS_ERR(alg))
- goto err_free_inst;
-
- spawn = skcipher_instance_ctx(inst);
- err = crypto_init_spawn(spawn, alg, skcipher_crypto_instance(inst),
- CRYPTO_ALG_TYPE_MASK);
- crypto_mod_put(alg);
- if (err)
- goto err_free_inst;
-
- err = crypto_inst_setname(skcipher_crypto_instance(inst), "ofb", alg);
- if (err)
- goto err_drop_spawn;
+ inst = skcipher_alloc_instance_simple(tmpl, tb, &alg);
+ if (IS_ERR(inst))
+ return PTR_ERR(inst);
/* OFB mode is a stream cipher. */
inst->alg.base.cra_blocksize = 1;
@@ -152,36 +68,15 @@ static int crypto_ofb_create(struct crypto_template *tmpl, struct rtattr **tb)
*/
inst->alg.chunksize = alg->cra_blocksize;
- inst->alg.base.cra_priority = alg->cra_priority;
- inst->alg.base.cra_alignmask = alg->cra_alignmask;
-
- inst->alg.ivsize = alg->cra_blocksize;
- inst->alg.min_keysize = alg->cra_cipher.cia_min_keysize;
- inst->alg.max_keysize = alg->cra_cipher.cia_max_keysize;
-
- inst->alg.base.cra_ctxsize = sizeof(struct crypto_ofb_ctx);
-
- inst->alg.init = crypto_ofb_init_tfm;
- inst->alg.exit = crypto_ofb_exit_tfm;
-
- inst->alg.setkey = crypto_ofb_setkey;
inst->alg.encrypt = crypto_ofb_crypt;
inst->alg.decrypt = crypto_ofb_crypt;
- inst->free = crypto_ofb_free;
-
err = skcipher_register_instance(tmpl, inst);
if (err)
- goto err_drop_spawn;
+ inst->free(inst);
-out:
+ crypto_mod_put(alg);
return err;
-
-err_drop_spawn:
- crypto_drop_spawn(spawn);
-err_free_inst:
- kfree(inst);
- goto out;
}
static struct crypto_template crypto_ofb_tmpl = {
@@ -204,5 +99,5 @@ module_init(crypto_ofb_module_init);
module_exit(crypto_ofb_module_exit);
MODULE_LICENSE("GPL");
-MODULE_DESCRIPTION("OFB block cipher algorithm");
+MODULE_DESCRIPTION("OFB block cipher mode of operation");
MODULE_ALIAS_CRYPTO("ofb");
--
2.20.1
