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authorArd Biesheuvel <ard.biesheuvel@linaro.org>2017-07-24 11:28:04 +0100
committerHerbert Xu <herbert@gondor.apana.org.au>2017-08-04 09:27:15 +0800
commit45fe93dff2fb58b22de04c729f8447ba0f773d93 (patch)
tree6f6039696f88fb5461831d4bfbc4e62f059092d5 /crypto
parenta7c391f04fe3259fb0417d71fec78ae28f25780e (diff)
download96b-common-45fe93dff2fb58b22de04c729f8447ba0f773d93.tar.gz
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 'crypto')
-rw-r--r--crypto/ctr.c3
-rw-r--r--crypto/pcbc.c12
2 files changed, 5 insertions, 10 deletions
diff --git a/crypto/ctr.c b/crypto/ctr.c
index 477d9226ccaa..854d924f9d8e 100644
--- a/crypto/ctr.c
+++ b/crypto/ctr.c
@@ -65,8 +65,7 @@ static void crypto_ctr_crypt_final(struct blkcipher_walk *walk,
unsigned int nbytes = walk->nbytes;
crypto_cipher_encrypt_one(tfm, keystream, ctrblk);
- crypto_xor(keystream, src, nbytes);
- memcpy(dst, keystream, nbytes);
+ crypto_xor_cpy(dst, keystream, src, nbytes);
crypto_inc(ctrblk, bsize);
}
diff --git a/crypto/pcbc.c b/crypto/pcbc.c
index 29dd2b4a3b85..d9e45a958720 100644
--- a/crypto/pcbc.c
+++ b/crypto/pcbc.c
@@ -55,8 +55,7 @@ static int crypto_pcbc_encrypt_segment(struct skcipher_request *req,
do {
crypto_xor(iv, src, bsize);
crypto_cipher_encrypt_one(tfm, dst, iv);
- memcpy(iv, dst, bsize);
- crypto_xor(iv, src, bsize);
+ crypto_xor_cpy(iv, dst, src, bsize);
src += bsize;
dst += bsize;
@@ -79,8 +78,7 @@ static int crypto_pcbc_encrypt_inplace(struct skcipher_request *req,
memcpy(tmpbuf, src, bsize);
crypto_xor(iv, src, bsize);
crypto_cipher_encrypt_one(tfm, src, iv);
- memcpy(iv, tmpbuf, bsize);
- crypto_xor(iv, src, bsize);
+ crypto_xor_cpy(iv, tmpbuf, src, bsize);
src += bsize;
} while ((nbytes -= bsize) >= bsize);
@@ -127,8 +125,7 @@ static int crypto_pcbc_decrypt_segment(struct skcipher_request *req,
do {
crypto_cipher_decrypt_one(tfm, dst, src);
crypto_xor(dst, iv, bsize);
- memcpy(iv, src, bsize);
- crypto_xor(iv, dst, bsize);
+ crypto_xor_cpy(iv, dst, src, bsize);
src += bsize;
dst += bsize;
@@ -153,8 +150,7 @@ static int crypto_pcbc_decrypt_inplace(struct skcipher_request *req,
memcpy(tmpbuf, src, bsize);
crypto_cipher_decrypt_one(tfm, src, src);
crypto_xor(src, iv, bsize);
- memcpy(iv, tmpbuf, bsize);
- crypto_xor(iv, src, bsize);
+ crypto_xor_cpy(iv, src, tmpbuf, bsize);
src += bsize;
} while ((nbytes -= bsize) >= bsize);