diff options
| author | Stephan Müller <smueller@chronox.de> | 2018-07-20 19:42:01 +0200 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2018-08-03 18:05:48 +0800 |
| commit | 43490e8046b5d273eb82710b04290c5997138adc (patch) | |
| tree | 133d7312bb948fbff585eba5f8587c2181b3cdbf /include | |
| parent | c5f5aeef9b55b362ad5a0e04e4b41cd63b208842 (diff) | |
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')
| -rw-r--r-- | include/crypto/drbg.h | 2 |
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 */ |