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crypto: skcipher - Add separate walker for AEAD decryption 

The AEAD decrypt interface includes the authentication tag in
req->cryptlen.  Therefore we need to exlucde that when doing
a walk over it.

This patch adds separate walker functions for AEAD encryption
and decryption.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
This commit is contained in:
Herbert Xu 2016-11-30 21:14:07 +08:00
parent 81126d1a8b
commit 34bc085c83
2 changed files with 34 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

33
crypto/skcipher.c
View File

@ -500,8 +500,8 @@ int skcipher_walk_async(struct skcipher_walk *walk,
}
EXPORT_SYMBOL_GPL(skcipher_walk_async);
int skcipher_walk_aead(struct skcipher_walk *walk, struct aead_request *req,
bool atomic)
static int skcipher_walk_aead_common(struct skcipher_walk *walk,
struct aead_request *req, bool atomic)
{
struct crypto_aead *tfm = crypto_aead_reqtfm(req);
int err;
@ -514,7 +514,6 @@ int skcipher_walk_aead(struct skcipher_walk *walk, struct aead_request *req,
scatterwalk_copychunks(NULL, &walk->in, req->assoclen, 2);
scatterwalk_copychunks(NULL, &walk->out, req->assoclen, 2);
walk->total = req->cryptlen;
walk->iv = req->iv;
walk->oiv = req->iv;
@ -535,8 +534,36 @@ int skcipher_walk_aead(struct skcipher_walk *walk, struct aead_request *req,
return err;
}
int skcipher_walk_aead(struct skcipher_walk *walk, struct aead_request *req,
bool atomic)
{
walk->total = req->cryptlen;
return skcipher_walk_aead_common(walk, req, atomic);
}
EXPORT_SYMBOL_GPL(skcipher_walk_aead);
int skcipher_walk_aead_encrypt(struct skcipher_walk *walk,
struct aead_request *req, bool atomic)
{
walk->total = req->cryptlen;
return skcipher_walk_aead_common(walk, req, atomic);
}
EXPORT_SYMBOL_GPL(skcipher_walk_aead_encrypt);
int skcipher_walk_aead_decrypt(struct skcipher_walk *walk,
struct aead_request *req, bool atomic)
{
struct crypto_aead *tfm = crypto_aead_reqtfm(req);
walk->total = req->cryptlen - crypto_aead_authsize(tfm);
return skcipher_walk_aead_common(walk, req, atomic);
}
EXPORT_SYMBOL_GPL(skcipher_walk_aead_decrypt);
static unsigned int crypto_skcipher_extsize(struct crypto_alg *alg)
{
if (alg->cra_type == &crypto_blkcipher_type)

4
include/crypto/internal/skcipher.h
View File

@ -149,6 +149,10 @@ int skcipher_walk_async(struct skcipher_walk *walk,
struct skcipher_request *req);
int skcipher_walk_aead(struct skcipher_walk *walk, struct aead_request *req,
bool atomic);
int skcipher_walk_aead_encrypt(struct skcipher_walk *walk,
struct aead_request *req, bool atomic);
int skcipher_walk_aead_decrypt(struct skcipher_walk *walk,
struct aead_request *req, bool atomic);
void skcipher_walk_complete(struct skcipher_walk *walk, int err);
static inline void ablkcipher_request_complete(struct ablkcipher_request *req,