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| author | Arvind Sankar <nivedita@alum.mit.edu> | 2020-10-25 15:31:17 +0100 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2020-10-30 07:35:03 +0100 |
| commit | b8399819b2dd6f29195ed7535217b66c01b1e57d (patch) | |
| tree | 5c7ef309f029a74a63ed469a3dc2d45e0116e2c9 /.clang-format | |
| parent | crypto: lib/sha256 - Don't clear temporary variables (diff) | |
| download | linux-b8399819b2dd6f29195ed7535217b66c01b1e57d.tar.xz linux-b8399819b2dd6f29195ed7535217b66c01b1e57d.zip | |
crypto: lib/sha256 - Clear W[] in sha256_update() instead of sha256_transform()
The temporary W[] array is currently zeroed out once every call to
sha256_transform(), i.e. once every 64 bytes of input data. Moving it to
sha256_update() instead so that it is cleared only once per update can
save about 2-3% of the total time taken to compute the digest, with a
reasonable memset() implementation, and considerably more (~20%) with a
bad one (eg the x86 purgatory currently uses a memset() coded in C).
Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu>
Reviewed-by: Eric Biggers <ebiggers@google.com>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to '.clang-format')
0 files changed, 0 insertions, 0 deletions