mirror of
https://github.com/FEX-Emu/linux.git
synced 2024-12-16 05:50:19 +00:00
crypto: ecb - convert to skcipher API
Convert the ECB template from the deprecated "blkcipher" API to the "skcipher" API, taking advantage of skcipher_alloc_instance_simple() to simplify it considerably. 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
Herbert Xu
parent
11f14630c4
commit
52e9368fe6
151
crypto/ecb.c
151
crypto/ecb.c
@ -11,162 +11,83 @@
|
||||
*/
|
||||
|
||||
#include <crypto/algapi.h>
|
||||
#include <crypto/internal/skcipher.h>
|
||||
#include <linux/err.h>
|
||||
#include <linux/init.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/scatterlist.h>
|
||||
#include <linux/slab.h>
|
||||
|
||||
struct crypto_ecb_ctx {
|
||||
struct crypto_cipher *child;
|
||||
};
|
||||
|
||||
static int crypto_ecb_setkey(struct crypto_tfm *parent, const u8 *key,
|
||||
unsigned int keylen)
|
||||
{
|
||||
struct crypto_ecb_ctx *ctx = crypto_tfm_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_tfm_get_flags(parent) &
|
||||
CRYPTO_TFM_REQ_MASK);
|
||||
err = crypto_cipher_setkey(child, key, keylen);
|
||||
crypto_tfm_set_flags(parent, crypto_cipher_get_flags(child) &
|
||||
CRYPTO_TFM_RES_MASK);
|
||||
return err;
|
||||
}
|
||||
|
||||
static int crypto_ecb_crypt(struct blkcipher_desc *desc,
|
||||
struct blkcipher_walk *walk,
|
||||
struct crypto_cipher *tfm,
|
||||
static int crypto_ecb_crypt(struct skcipher_request *req,
|
||||
struct crypto_cipher *cipher,
|
||||
void (*fn)(struct crypto_tfm *, u8 *, const u8 *))
|
||||
{
|
||||
int bsize = crypto_cipher_blocksize(tfm);
|
||||
const unsigned int bsize = crypto_cipher_blocksize(cipher);
|
||||
struct skcipher_walk walk;
|
||||
unsigned int nbytes;
|
||||
int err;
|
||||
|
||||
err = blkcipher_walk_virt(desc, walk);
|
||||
err = skcipher_walk_virt(&walk, req, false);
|
||||
|
||||
while ((nbytes = walk->nbytes)) {
|
||||
u8 *wsrc = walk->src.virt.addr;
|
||||
u8 *wdst = walk->dst.virt.addr;
|
||||
while ((nbytes = walk.nbytes) != 0) {
|
||||
const u8 *src = walk.src.virt.addr;
|
||||
u8 *dst = walk.dst.virt.addr;
|
||||
|
||||
do {
|
||||
fn(crypto_cipher_tfm(tfm), wdst, wsrc);
|
||||
fn(crypto_cipher_tfm(cipher), dst, src);
|
||||
|
||||
wsrc += bsize;
|
||||
wdst += bsize;
|
||||
src += bsize;
|
||||
dst += bsize;
|
||||
} while ((nbytes -= bsize) >= bsize);
|
||||
|
||||
err = blkcipher_walk_done(desc, walk, nbytes);
|
||||
err = skcipher_walk_done(&walk, nbytes);
|
||||
}
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
static int crypto_ecb_encrypt(struct blkcipher_desc *desc,
|
||||
struct scatterlist *dst, struct scatterlist *src,
|
||||
unsigned int nbytes)
|
||||
static int crypto_ecb_encrypt(struct skcipher_request *req)
|
||||
{
|
||||
struct blkcipher_walk walk;
|
||||
struct crypto_blkcipher *tfm = desc->tfm;
|
||||
struct crypto_ecb_ctx *ctx = crypto_blkcipher_ctx(tfm);
|
||||
struct crypto_cipher *child = ctx->child;
|
||||
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
|
||||
struct crypto_cipher *cipher = skcipher_cipher_simple(tfm);
|
||||
|
||||
blkcipher_walk_init(&walk, dst, src, nbytes);
|
||||
return crypto_ecb_crypt(desc, &walk, child,
|
||||
crypto_cipher_alg(child)->cia_encrypt);
|
||||
return crypto_ecb_crypt(req, cipher,
|
||||
crypto_cipher_alg(cipher)->cia_encrypt);
|
||||
}
|
||||
|
||||
static int crypto_ecb_decrypt(struct blkcipher_desc *desc,
|
||||
struct scatterlist *dst, struct scatterlist *src,
|
||||
unsigned int nbytes)
|
||||
static int crypto_ecb_decrypt(struct skcipher_request *req)
|
||||
{
|
||||
struct blkcipher_walk walk;
|
||||
struct crypto_blkcipher *tfm = desc->tfm;
|
||||
struct crypto_ecb_ctx *ctx = crypto_blkcipher_ctx(tfm);
|
||||
struct crypto_cipher *child = ctx->child;
|
||||
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
|
||||
struct crypto_cipher *cipher = skcipher_cipher_simple(tfm);
|
||||
|
||||
blkcipher_walk_init(&walk, dst, src, nbytes);
|
||||
return crypto_ecb_crypt(desc, &walk, child,
|
||||
crypto_cipher_alg(child)->cia_decrypt);
|
||||
return crypto_ecb_crypt(req, cipher,
|
||||
crypto_cipher_alg(cipher)->cia_decrypt);
|
||||
}
|
||||
|
||||
static int crypto_ecb_init_tfm(struct crypto_tfm *tfm)
|
||||
static int crypto_ecb_create(struct crypto_template *tmpl, struct rtattr **tb)
|
||||
{
|
||||
struct crypto_instance *inst = (void *)tfm->__crt_alg;
|
||||
struct crypto_spawn *spawn = crypto_instance_ctx(inst);
|
||||
struct crypto_ecb_ctx *ctx = crypto_tfm_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_ecb_exit_tfm(struct crypto_tfm *tfm)
|
||||
{
|
||||
struct crypto_ecb_ctx *ctx = crypto_tfm_ctx(tfm);
|
||||
crypto_free_cipher(ctx->child);
|
||||
}
|
||||
|
||||
static struct crypto_instance *crypto_ecb_alloc(struct rtattr **tb)
|
||||
{
|
||||
struct crypto_instance *inst;
|
||||
struct skcipher_instance *inst;
|
||||
struct crypto_alg *alg;
|
||||
int err;
|
||||
|
||||
err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_BLKCIPHER);
|
||||
if (err)
|
||||
return ERR_PTR(err);
|
||||
|
||||
alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_CIPHER,
|
||||
CRYPTO_ALG_TYPE_MASK);
|
||||
if (IS_ERR(alg))
|
||||
return ERR_CAST(alg);
|
||||
|
||||
inst = crypto_alloc_instance("ecb", alg);
|
||||
inst = skcipher_alloc_instance_simple(tmpl, tb, &alg);
|
||||
if (IS_ERR(inst))
|
||||
goto out_put_alg;
|
||||
return PTR_ERR(inst);
|
||||
|
||||
inst->alg.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER;
|
||||
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_blkcipher_type;
|
||||
inst->alg.ivsize = 0; /* ECB mode doesn't take an IV */
|
||||
|
||||
inst->alg.cra_blkcipher.min_keysize = alg->cra_cipher.cia_min_keysize;
|
||||
inst->alg.cra_blkcipher.max_keysize = alg->cra_cipher.cia_max_keysize;
|
||||
inst->alg.encrypt = crypto_ecb_encrypt;
|
||||
inst->alg.decrypt = crypto_ecb_decrypt;
|
||||
|
||||
inst->alg.cra_ctxsize = sizeof(struct crypto_ecb_ctx);
|
||||
|
||||
inst->alg.cra_init = crypto_ecb_init_tfm;
|
||||
inst->alg.cra_exit = crypto_ecb_exit_tfm;
|
||||
|
||||
inst->alg.cra_blkcipher.setkey = crypto_ecb_setkey;
|
||||
inst->alg.cra_blkcipher.encrypt = crypto_ecb_encrypt;
|
||||
inst->alg.cra_blkcipher.decrypt = crypto_ecb_decrypt;
|
||||
|
||||
out_put_alg:
|
||||
err = skcipher_register_instance(tmpl, inst);
|
||||
if (err)
|
||||
inst->free(inst);
|
||||
crypto_mod_put(alg);
|
||||
return inst;
|
||||
}
|
||||
|
||||
static void crypto_ecb_free(struct crypto_instance *inst)
|
||||
{
|
||||
crypto_drop_spawn(crypto_instance_ctx(inst));
|
||||
kfree(inst);
|
||||
return err;
|
||||
}
|
||||
|
||||
static struct crypto_template crypto_ecb_tmpl = {
|
||||
.name = "ecb",
|
||||
.alloc = crypto_ecb_alloc,
|
||||
.free = crypto_ecb_free,
|
||||
.create = crypto_ecb_create,
|
||||
.module = THIS_MODULE,
|
||||
};
|
||||
|
||||
@ -184,5 +105,5 @@ module_init(crypto_ecb_module_init);
|
||||
module_exit(crypto_ecb_module_exit);
|
||||
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_DESCRIPTION("ECB block cipher algorithm");
|
||||
MODULE_DESCRIPTION("ECB block cipher mode of operation");
|
||||
MODULE_ALIAS_CRYPTO("ecb");
|
||||
|
||||
Loading…
Reference in New Issue
Block a user