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crypto: cfb - convert to skcipher_alloc_instance_simple() 

The CFB template just wraps a single block cipher algorithm, so simplify
it by converting it to use skcipher_alloc_instance_simple().

Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Eric Biggers 2019-01-03 20:16:16 -08:00 committed by Herbert Xu
parent a5a84a9dbf
commit 03b8302dda
1 changed files with 9 additions and 118 deletions
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127
crypto/cfb.c
View File

@ -25,28 +25,17 @@
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/types.h>
struct crypto_cfb_ctx {
struct crypto_cipher *child;
};
static unsigned int crypto_cfb_bsize(struct crypto_skcipher *tfm)
{
struct crypto_cfb_ctx *ctx = crypto_skcipher_ctx(tfm);
struct crypto_cipher *child = ctx->child;
return crypto_cipher_blocksize(child);
return crypto_cipher_blocksize(skcipher_cipher_simple(tfm));
}
static void crypto_cfb_encrypt_one(struct crypto_skcipher *tfm,
const u8 *src, u8 *dst)
{
struct crypto_cfb_ctx *ctx = crypto_skcipher_ctx(tfm);
crypto_cipher_encrypt_one(ctx->child, dst, src);
crypto_cipher_encrypt_one(skcipher_cipher_simple(tfm), dst, src);
}
/* final encrypt and decrypt is the same */
@ -186,22 +175,6 @@ static int crypto_cfb_decrypt_blocks(struct skcipher_walk *walk,
return crypto_cfb_decrypt_segment(walk, tfm);
}
static int crypto_cfb_setkey(struct crypto_skcipher *parent, const u8 *key,
unsigned int keylen)
{
struct crypto_cfb_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_cfb_decrypt(struct skcipher_request *req)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
@ -224,79 +197,18 @@ static int crypto_cfb_decrypt(struct skcipher_request *req)
return err;
}
static int crypto_cfb_init_tfm(struct crypto_skcipher *tfm)
{
struct skcipher_instance *inst = skcipher_alg_instance(tfm);
struct crypto_spawn *spawn = skcipher_instance_ctx(inst);
struct crypto_cfb_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_cfb_exit_tfm(struct crypto_skcipher *tfm)
{
struct crypto_cfb_ctx *ctx = crypto_skcipher_ctx(tfm);
crypto_free_cipher(ctx->child);
}
static void crypto_cfb_free(struct skcipher_instance *inst)
{
crypto_drop_skcipher(skcipher_instance_ctx(inst));
kfree(inst);
}
static int crypto_cfb_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 = skcipher_alloc_instance_simple(tmpl, tb, &alg);
if (IS_ERR(inst))
return PTR_ERR(inst);
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);
if (err)
goto err_put_alg;
err = crypto_inst_setname(skcipher_crypto_instance(inst), "cfb", alg);
if (err)
goto err_drop_spawn;
inst->alg.base.cra_priority = alg->cra_priority;
/* we're a stream cipher independend of the crypto cra_blocksize */
/* CFB mode is a stream cipher. */
inst->alg.base.cra_blocksize = 1;
inst->alg.base.cra_alignmask = alg->cra_alignmask;
/*
* To simplify the implementation, configure the skcipher walk to only
@ -304,36 +216,15 @@ static int crypto_cfb_create(struct crypto_template *tmpl, struct rtattr **tb)
*/
inst->alg.chunksize = alg->cra_blocksize;
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_cfb_ctx);
inst->alg.init = crypto_cfb_init_tfm;
inst->alg.exit = crypto_cfb_exit_tfm;
inst->alg.setkey = crypto_cfb_setkey;
inst->alg.encrypt = crypto_cfb_encrypt;
inst->alg.decrypt = crypto_cfb_decrypt;
inst->free = crypto_cfb_free;
err = skcipher_register_instance(tmpl, inst);
if (err)
goto err_drop_spawn;
crypto_mod_put(alg);
inst->free(inst);
out:
crypto_mod_put(alg);
return err;
err_drop_spawn:
crypto_drop_spawn(spawn);
err_put_alg:
crypto_mod_put(alg);
err_free_inst:
kfree(inst);
goto out;
}
static struct crypto_template crypto_cfb_tmpl = {
@ -356,5 +247,5 @@ module_init(crypto_cfb_module_init);
module_exit(crypto_cfb_module_exit);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("CFB block cipher algorithm");
MODULE_DESCRIPTION("CFB block cipher mode of operation");
MODULE_ALIAS_CRYPTO("cfb");