diff options
| author | Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2017-07-24 13:28:04 +0300 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2017-08-04 04:27:15 +0300 |
| commit | 45fe93dff2fb58b22de04c729f8447ba0f773d93 (patch) | |
| tree | 6f6039696f88fb5461831d4bfbc4e62f059092d5 /drivers/crypto | |
| parent | a7c391f04fe3259fb0417d71fec78ae28f25780e (diff) | |
| download | linux-45fe93dff2fb58b22de04c729f8447ba0f773d93.tar.xz | |
crypto: algapi - make crypto_xor() take separate dst and src arguments
There are quite a number of occurrences in the kernel of the pattern
if (dst != src)
memcpy(dst, src, walk.total % AES_BLOCK_SIZE);
crypto_xor(dst, final, walk.total % AES_BLOCK_SIZE);
or
crypto_xor(keystream, src, nbytes);
memcpy(dst, keystream, nbytes);
where crypto_xor() is preceded or followed by a memcpy() invocation
that is only there because crypto_xor() uses its output parameter as
one of the inputs. To avoid having to add new instances of this pattern
in the arm64 code, which will be refactored to implement non-SIMD
fallbacks, add an alternative implementation called crypto_xor_cpy(),
taking separate input and output arguments. This removes the need for
the separate memcpy().
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/crypto')
| -rw-r--r-- | drivers/crypto/vmx/aes_ctr.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/drivers/crypto/vmx/aes_ctr.c b/drivers/crypto/vmx/aes_ctr.c index 9c26d9e8dbea..17d84217dd76 100644 --- a/drivers/crypto/vmx/aes_ctr.c +++ b/drivers/crypto/vmx/aes_ctr.c @@ -104,8 +104,7 @@ static void p8_aes_ctr_final(struct p8_aes_ctr_ctx *ctx, pagefault_enable(); preempt_enable(); - crypto_xor(keystream, src, nbytes); - memcpy(dst, keystream, nbytes); + crypto_xor_cpy(dst, keystream, src, nbytes); crypto_inc(ctrblk, AES_BLOCK_SIZE); } |