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Subject[PATCH v5 08/11] crypto: qce: skcipher: Improve the conditions for requesting AES fallback cipher
Date
The following are the conditions for requesting AES fallback cipher.
- AES-192
- AES-XTS request with len <= 512 byte (Allow messages of length
less than 512 bytes for all other AES encryption algorithms other
than AES XTS)
- AES-XTS request with len > QCE_SECTOR_SIZE and is not a multiple
of it

Signed-off-by: Thara Gopinath <thara.gopinath@linaro.org>
---
drivers/crypto/qce/skcipher.c | 17 +++++++++++------
1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/drivers/crypto/qce/skcipher.c b/drivers/crypto/qce/skcipher.c
index 10e85b1fc0fd..8599250946b7 100644
--- a/drivers/crypto/qce/skcipher.c
+++ b/drivers/crypto/qce/skcipher.c
@@ -277,14 +277,19 @@ static int qce_skcipher_crypt(struct skcipher_request *req, int encrypt)
if (!IS_ALIGNED(req->cryptlen, blocksize))
return -EINVAL;

- /* qce is hanging when AES-XTS request len > QCE_SECTOR_SIZE and
- * is not a multiple of it; pass such requests to the fallback
+ /*
+ * Conditions for requesting a fallback cipher
+ * AES-192 (not supported by crypto engine (CE))
+ * AES-XTS request with len <= 512 byte (not recommended to use CE)
+ * AES-XTS request with len > QCE_SECTOR_SIZE and
+ * is not a multiple of it.(Revisit this condition to check if it is
+ * needed in all versions of CE)
*/
if (IS_AES(rctx->flags) &&
- (((keylen != AES_KEYSIZE_128 && keylen != AES_KEYSIZE_256) ||
- req->cryptlen <= aes_sw_max_len) ||
- (IS_XTS(rctx->flags) && req->cryptlen > QCE_SECTOR_SIZE &&
- req->cryptlen % QCE_SECTOR_SIZE))) {
+ ((keylen != AES_KEYSIZE_128 && keylen != AES_KEYSIZE_256) ||
+ (IS_XTS(rctx->flags) && ((req->cryptlen <= aes_sw_max_len) ||
+ (req->cryptlen > QCE_SECTOR_SIZE &&
+ req->cryptlen % QCE_SECTOR_SIZE))))) {
skcipher_request_set_tfm(&rctx->fallback_req, ctx->fallback);
skcipher_request_set_callback(&rctx->fallback_req,
req->base.flags,
--
2.25.1
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