xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

crypto: drbg - eliminate constant reinitialization of SGL

Browse Source 
The CTR DRBG requires two SGLs pointing to input/output buffers for the
CTR AES operation. The used SGLs always have only one entry. Thus, the
SGL can be initialized during allocation time, preventing a
re-initialization of the SGLs during each call.

The performance is increased by about 1 to 3 percent depending on the
size of the requested buffer size.

Signed-off-by: Stephan Mueller <smueller@chronox.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Stephan Mueller
2018-07-10 17:56:33 +02:00
committed by Herbert Xu
parent 3fd8093b41
commit cf862cbc83
2 changed files with 8 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
include/crypto/drbg.h
View File

@@ -127,6 +127,7 @@ struct drbg_state {
__u8 *outscratchpadbuf; /* CTR mode output scratchpad */
__u8 *outscratchpad; /* CTR mode aligned outbuf */
struct crypto_wait ctr_wait; /* CTR mode async wait obj */
struct scatterlist sg_in, sg_out; /* CTR mode SGLs */
bool seeded; /* DRBG fully seeded? */
bool pr; /* Prediction resistance enabled? */