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Subject[PATCH 09/22] crypto: xts - add check for block length equal to zero
Date
From: Andrei Botila <andrei.botila@nxp.com>

Standardize the way input lengths equal to 0 are handled in all skcipher
algorithms. All the algorithms return 0 for input lengths equal to zero.

Signed-off-by: Andrei Botila <andrei.botila@nxp.com>
---
crypto/xts.c | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/crypto/xts.c b/crypto/xts.c
index 3c3ed02c7663..7df68f52fddc 100644
--- a/crypto/xts.c
+++ b/crypto/xts.c
@@ -263,6 +263,9 @@ static int xts_encrypt(struct skcipher_request *req)
struct skcipher_request *subreq = &rctx->subreq;
int err;

+ if (!req->cryptlen)
+ return 0;
+
err = xts_init_crypt(req, xts_encrypt_done) ?:
xts_xor_tweak_pre(req, true) ?:
crypto_skcipher_encrypt(subreq) ?:
@@ -280,6 +283,9 @@ static int xts_decrypt(struct skcipher_request *req)
struct skcipher_request *subreq = &rctx->subreq;
int err;

+ if (!req->cryptlen)
+ return 0;
+
err = xts_init_crypt(req, xts_decrypt_done) ?:
xts_xor_tweak_pre(req, false) ?:
crypto_skcipher_decrypt(subreq) ?:
--
2.17.1
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