From: Eric Biggers <ebiggers@xxxxxxxxxx>
The PCBC template just wraps a single block cipher algorithm, so
simplify it by converting it to use skcipher_alloc_instance_simple().
Signed-off-by: Eric Biggers <ebiggers@xxxxxxxxxx>
---
crypto/pcbc.c | 125 +++++---------------------------------------------
1 file changed, 11 insertions(+), 114 deletions(-)
diff --git a/crypto/pcbc.c b/crypto/pcbc.c
index 4f97a9d069b62..2fa03fc576fe4 100644
--- a/crypto/pcbc.c
+++ b/crypto/pcbc.c
@@ -20,28 +20,6 @@
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
-#include <linux/slab.h>
-#include <linux/compiler.h>
-
-struct crypto_pcbc_ctx {
- struct crypto_cipher *child;
-};
-
-static int crypto_pcbc_setkey(struct crypto_skcipher *parent, const u8 *key,
- unsigned int keylen)
-{
- struct crypto_pcbc_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_pcbc_encrypt_segment(struct skcipher_request *req,
struct skcipher_walk *walk,
@@ -90,8 +68,7 @@ static int crypto_pcbc_encrypt_inplace(struct skcipher_request *req,
static int crypto_pcbc_encrypt(struct skcipher_request *req)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
- struct crypto_pcbc_ctx *ctx = crypto_skcipher_ctx(tfm);
- struct crypto_cipher *child = ctx->child;
+ struct crypto_cipher *cipher = skcipher_cipher_simple(tfm);
struct skcipher_walk walk;
unsigned int nbytes;
int err;
@@ -101,10 +78,10 @@ static int crypto_pcbc_encrypt(struct skcipher_request *req)
while ((nbytes = walk.nbytes)) {
if (walk.src.virt.addr == walk.dst.virt.addr)
nbytes = crypto_pcbc_encrypt_inplace(req, &walk,
- child);
+ cipher);
else
nbytes = crypto_pcbc_encrypt_segment(req, &walk,
- child);
+ cipher);
err = skcipher_walk_done(&walk, nbytes);
}
@@ -158,8 +135,7 @@ static int crypto_pcbc_decrypt_inplace(struct skcipher_request *req,
static int crypto_pcbc_decrypt(struct skcipher_request *req)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
- struct crypto_pcbc_ctx *ctx = crypto_skcipher_ctx(tfm);
- struct crypto_cipher *child = ctx->child;
+ struct crypto_cipher *cipher = skcipher_cipher_simple(tfm);
struct skcipher_walk walk;
unsigned int nbytes;
int err;
@@ -169,113 +145,34 @@ static int crypto_pcbc_decrypt(struct skcipher_request *req)
while ((nbytes = walk.nbytes)) {
if (walk.src.virt.addr == walk.dst.virt.addr)
nbytes = crypto_pcbc_decrypt_inplace(req, &walk,
- child);
+ cipher);
else
nbytes = crypto_pcbc_decrypt_segment(req, &walk,
- child);
+ cipher);
err = skcipher_walk_done(&walk, nbytes);
}
return err;
}
-static int crypto_pcbc_init_tfm(struct crypto_skcipher *tfm)
-{
- struct skcipher_instance *inst = skcipher_alg_instance(tfm);
- struct crypto_spawn *spawn = skcipher_instance_ctx(inst);
- struct crypto_pcbc_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_pcbc_exit_tfm(struct crypto_skcipher *tfm)
-{
- struct crypto_pcbc_ctx *ctx = crypto_skcipher_ctx(tfm);
-
- crypto_free_cipher(ctx->child);
-}
-
-static void crypto_pcbc_free(struct skcipher_instance *inst)
-{
- crypto_drop_skcipher(skcipher_instance_ctx(inst));
- kfree(inst);
-}
-
static int crypto_pcbc_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;
int err;
- algt = crypto_get_attr_type(tb);
- if (IS_ERR(algt))
- return PTR_ERR(algt);
-
- if ((algt->type ^ CRYPTO_ALG_TYPE_SKCIPHER) & algt->mask)
- return -EINVAL;
-
- inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
- if (!inst)
- return -ENOMEM;
-
- alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_CIPHER,
- CRYPTO_ALG_TYPE_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), "pcbc", alg);
- if (err)
- goto err_drop_spawn;
+ inst = skcipher_alloc_instance_simple(tmpl, tb, &alg);
+ if (IS_ERR(inst))
+ return PTR_ERR(inst);
- inst->alg.base.cra_priority = alg->cra_priority;
- inst->alg.base.cra_blocksize = alg->cra_blocksize;
- 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_pcbc_ctx);
-
- inst->alg.init = crypto_pcbc_init_tfm;
- inst->alg.exit = crypto_pcbc_exit_tfm;
-
- inst->alg.setkey = crypto_pcbc_setkey;
inst->alg.encrypt = crypto_pcbc_encrypt;
inst->alg.decrypt = crypto_pcbc_decrypt;
- inst->free = crypto_pcbc_free;
-
err = skcipher_register_instance(tmpl, inst);
if (err)
- goto err_drop_spawn;
+ inst->free(inst);
crypto_mod_put(alg);
-
-out:
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_pcbc_tmpl = {
@@ -298,5 +195,5 @@ module_init(crypto_pcbc_module_init);
module_exit(crypto_pcbc_module_exit);
MODULE_LICENSE("GPL");
-MODULE_DESCRIPTION("PCBC block cipher algorithm");
+MODULE_DESCRIPTION("PCBC block cipher mode of operation");
MODULE_ALIAS_CRYPTO("pcbc");
--
2.20.1
