[CRYPTO] authenc: Merge common hashing code
This patch merges the common hashing code between encryption and decryption.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/crypto/authenc.c b/crypto/authenc.c
index aa442de..394e733 100644
--- a/crypto/authenc.c
+++ b/crypto/authenc.c
@@ -87,17 +87,18 @@
goto out;
}
-static int crypto_authenc_hash(struct aead_request *req)
+static u8 *crypto_authenc_hash(struct aead_request *req, unsigned int flags,
+ struct scatterlist *cipher,
+ unsigned int cryptlen)
{
struct crypto_aead *authenc = crypto_aead_reqtfm(req);
struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
struct crypto_hash *auth = ctx->auth;
struct hash_desc desc = {
.tfm = auth,
+ .flags = aead_request_flags(req) & flags,
};
u8 *hash = aead_request_ctx(req);
- struct scatterlist *dst = req->dst;
- unsigned int cryptlen = req->cryptlen;
int err;
hash = (u8 *)ALIGN((unsigned long)hash + crypto_hash_alignmask(auth),
@@ -112,7 +113,7 @@
if (err)
goto auth_unlock;
- err = crypto_hash_update(&desc, dst, cryptlen);
+ err = crypto_hash_update(&desc, cipher, cryptlen);
if (err)
goto auth_unlock;
@@ -121,7 +122,21 @@
spin_unlock_bh(&ctx->auth_lock);
if (err)
- return err;
+ return ERR_PTR(err);
+
+ return hash;
+}
+
+static int crypto_authenc_genicv(struct aead_request *req, unsigned int flags)
+{
+ struct crypto_aead *authenc = crypto_aead_reqtfm(req);
+ struct scatterlist *dst = req->dst;
+ unsigned int cryptlen = req->cryptlen;
+ u8 *hash;
+
+ hash = crypto_authenc_hash(req, flags, dst, cryptlen);
+ if (IS_ERR(hash))
+ return PTR_ERR(hash);
scatterwalk_map_and_copy(hash, dst, cryptlen,
crypto_aead_authsize(authenc), 1);
@@ -132,7 +147,7 @@
int err)
{
if (!err)
- err = crypto_authenc_hash(req->data);
+ err = crypto_authenc_genicv(req->data, 0);
aead_request_complete(req->data, err);
}
@@ -154,50 +169,25 @@
if (err)
return err;
- return crypto_authenc_hash(req);
+ return crypto_authenc_genicv(req, CRYPTO_TFM_REQ_MAY_SLEEP);
}
static int crypto_authenc_verify(struct aead_request *req,
unsigned int cryptlen)
{
struct crypto_aead *authenc = crypto_aead_reqtfm(req);
- struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
- struct crypto_hash *auth = ctx->auth;
- struct hash_desc desc = {
- .tfm = auth,
- .flags = aead_request_flags(req),
- };
- u8 *ohash = aead_request_ctx(req);
+ u8 *ohash;
u8 *ihash;
struct scatterlist *src = req->src;
unsigned int authsize;
- int err;
- ohash = (u8 *)ALIGN((unsigned long)ohash + crypto_hash_alignmask(auth),
- crypto_hash_alignmask(auth) + 1);
- ihash = ohash + crypto_hash_digestsize(auth);
-
- spin_lock_bh(&ctx->auth_lock);
- err = crypto_hash_init(&desc);
- if (err)
- goto auth_unlock;
-
- err = crypto_hash_update(&desc, req->assoc, req->assoclen);
- if (err)
- goto auth_unlock;
-
- err = crypto_hash_update(&desc, src, cryptlen);
- if (err)
- goto auth_unlock;
-
- err = crypto_hash_final(&desc, ohash);
-auth_unlock:
- spin_unlock_bh(&ctx->auth_lock);
-
- if (err)
- return err;
+ ohash = crypto_authenc_hash(req, CRYPTO_TFM_REQ_MAY_SLEEP, src,
+ cryptlen);
+ if (IS_ERR(ohash))
+ return PTR_ERR(ohash);
authsize = crypto_aead_authsize(authenc);
+ ihash = ohash + authsize;
scatterwalk_map_and_copy(ihash, src, cryptlen, authsize, 0);
return memcmp(ihash, ohash, authsize) ? -EBADMSG: 0;
}