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authorStephan Müller <smueller@chronox.de>2018-07-20 20:42:01 +0300
committerHerbert Xu <herbert@gondor.apana.org.au>2018-08-03 13:05:48 +0300
commit43490e8046b5d273eb82710b04290c5997138adc (patch)
tree133d7312bb948fbff585eba5f8587c2181b3cdbf /include/crypto
parentc5f5aeef9b55b362ad5a0e04e4b41cd63b208842 (diff)
downloadlinux-43490e8046b5d273eb82710b04290c5997138adc.tar.xz
crypto: drbg - in-place cipher operation for CTR
The cipher implementations of the kernel crypto API favor in-place cipher operations. Thus, switch the CTR cipher operation in the DRBG to perform in-place operations. This is implemented by using the output buffer as input buffer and zeroizing it before the cipher operation to implement a CTR encryption of a NULL buffer. The speed improvement is quite visibile with the following comparison using the LRNG implementation. Without the patch set: 16 bytes| 12.267661 MB/s| 61338304 bytes | 5000000213 ns 32 bytes| 23.603770 MB/s| 118018848 bytes | 5000000073 ns 64 bytes| 46.732262 MB/s| 233661312 bytes | 5000000241 ns 128 bytes| 90.038042 MB/s| 450190208 bytes | 5000000244 ns 256 bytes| 160.399616 MB/s| 801998080 bytes | 5000000393 ns 512 bytes| 259.878400 MB/s| 1299392000 bytes | 5000001675 ns 1024 bytes| 386.050662 MB/s| 1930253312 bytes | 5000001661 ns 2048 bytes| 493.641728 MB/s| 2468208640 bytes | 5000001598 ns 4096 bytes| 581.835981 MB/s| 2909179904 bytes | 5000003426 ns With the patch set: 16 bytes | 17.051142 MB/s | 85255712 bytes | 5000000854 ns 32 bytes | 32.695898 MB/s | 163479488 bytes | 5000000544 ns 64 bytes | 64.490739 MB/s | 322453696 bytes | 5000000954 ns 128 bytes | 123.285043 MB/s | 616425216 bytes | 5000000201 ns 256 bytes | 233.434573 MB/s | 1167172864 bytes | 5000000573 ns 512 bytes | 384.405197 MB/s | 1922025984 bytes | 5000000671 ns 1024 bytes | 566.313370 MB/s | 2831566848 bytes | 5000001080 ns 2048 bytes | 744.518042 MB/s | 3722590208 bytes | 5000000926 ns 4096 bytes | 867.501670 MB/s | 4337508352 bytes | 5000002181 ns Signed-off-by: Stephan Mueller <smueller@chronox.de> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'include/crypto')
-rw-r--r--include/crypto/drbg.h2
1 files changed, 0 insertions, 2 deletions
diff --git a/include/crypto/drbg.h b/include/crypto/drbg.h
index 54b9f5d375f5..3fb581bf3b87 100644
--- a/include/crypto/drbg.h
+++ b/include/crypto/drbg.h
@@ -122,8 +122,6 @@ struct drbg_state {
struct crypto_skcipher *ctr_handle; /* CTR mode cipher handle */
struct skcipher_request *ctr_req; /* CTR mode request handle */
- __u8 *ctr_null_value_buf; /* CTR mode unaligned buffer */
- __u8 *ctr_null_value; /* CTR mode aligned zero buf */
__u8 *outscratchpadbuf; /* CTR mode output scratchpad */
__u8 *outscratchpad; /* CTR mode aligned outbuf */
struct crypto_wait ctr_wait; /* CTR mode async wait obj */