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authorStephan Mueller <smueller@chronox.de>2018-07-10 17:56:33 +0200
committerHerbert Xu <herbert@gondor.apana.org.au>2018-07-20 13:51:21 +0800
commitcf862cbc831982a27f14a08adf82ad9ca8d86205 (patch)
tree84b26e66645be295e8e91bace8bcd793daf4c51b /include/crypto/drbg.h
parent3fd8093b41e745448ffeb0a0d3becc2cd1f9d7ad (diff)
downloadlinux-cf862cbc831982a27f14a08adf82ad9ca8d86205.tar.bz2
crypto: drbg - eliminate constant reinitialization of SGL
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>
Diffstat (limited to 'include/crypto/drbg.h')
-rw-r--r--include/crypto/drbg.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/crypto/drbg.h b/include/crypto/drbg.h
index 8f941102af36..54b9f5d375f5 100644
--- a/include/crypto/drbg.h
+++ b/include/crypto/drbg.h
@@ -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? */