From 34bc085c839cef85e3e795b1cee29514f69c3081 Mon Sep 17 00:00:00 2001 From: Herbert Xu Date: Wed, 30 Nov 2016 21:14:07 +0800 Subject: 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 Reviewed-by: Ard Biesheuvel --- crypto/skcipher.c | 33 ++++++++++++++++++++++++++++++--- 1 file changed, 30 insertions(+), 3 deletions(-) (limited to 'crypto') diff --git a/crypto/skcipher.c b/crypto/skcipher.c index 5367f817b40e..aca07c643d41 100644 --- a/crypto/skcipher.c +++ b/crypto/skcipher.c @@ -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) -- cgit v1.2.3-59-g8ed1b