diff options
| author | Thara Gopinath <thara.gopinath@linaro.org> | 2021-02-11 15:01:25 -0500 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2021-03-07 15:13:16 +1100 |
| commit | 25b71d61d6317212274b822e1cdbb03e499eea43 (patch) | |
| tree | 6ac848e0cff41318542ca0df626ae27395feb3e8 /drivers | |
| parent | 02d0dae3ce2adb5549c7f6c6e714181ed6ee100d (diff) | |
| download | linux-25b71d61d6317212274b822e1cdbb03e499eea43.tar.bz2 | |
crypto: qce - Improve the conditions for requesting AES fallback cipher
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>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/crypto/qce/skcipher.c | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/drivers/crypto/qce/skcipher.c b/drivers/crypto/qce/skcipher.c index 11a2a30631af..2e6ab1d33a31 100644 --- a/drivers/crypto/qce/skcipher.c +++ b/drivers/crypto/qce/skcipher.c @@ -274,14 +274,19 @@ 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, |