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| author | Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2017-07-24 12:28:04 +0200 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2017-08-04 03:27:15 +0200 |
| commit | 45fe93dff2fb58b22de04c729f8447ba0f773d93 (patch) | |
| tree | 6f6039696f88fb5461831d4bfbc4e62f059092d5 /arch/sparc | |
| parent | crypto: algapi - use separate dst and src operands for __crypto_xor() (diff) | |
| download | linux-45fe93dff2fb58b22de04c729f8447ba0f773d93.tar.xz linux-45fe93dff2fb58b22de04c729f8447ba0f773d93.zip | |
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 'arch/sparc')
| -rw-r--r-- | arch/sparc/crypto/aes_glue.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/arch/sparc/crypto/aes_glue.c b/arch/sparc/crypto/aes_glue.c index c90930de76ba..3cd4f6b198b6 100644 --- a/arch/sparc/crypto/aes_glue.c +++ b/arch/sparc/crypto/aes_glue.c @@ -344,8 +344,7 @@ static void ctr_crypt_final(struct crypto_sparc64_aes_ctx *ctx, ctx->ops->ecb_encrypt(&ctx->key[0], (const u64 *)ctrblk, keystream, AES_BLOCK_SIZE); - crypto_xor((u8 *) keystream, src, nbytes); - memcpy(dst, keystream, nbytes); + crypto_xor_cpy(dst, (u8 *) keystream, src, nbytes); crypto_inc(ctrblk, AES_BLOCK_SIZE); } |