Skip to contentSkip to conversation

crypto: salsa20-generic - use crypto_xor_cpy()

PATCH In review Eric Biggers 2 participants 2 messages Mar 15, 2019 – Mar 22, 2019 Crypto API

lore
Share & tools
lore

Eric Biggers

author
#0 lore raw

PATCH 1/1 crypto: salsa20-generic - use crypto_xor_cpy()

From: Eric Biggers <[email protected]>

In salsa20_docrypt(), use crypto_xor_cpy() instead of crypto_xor(). This avoids having to memcpy() the src buffer to the dst buffer.

Signed-off-by Eric Biggers <[email protected]>
---
 crypto/salsa20_generic.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)
crypto/salsa20_generic.c +4 -5
index 00fce32ae17a..443fba09cbed 100644
@@ -86,18 +86,17 @@ static void salsa20_docrypt(u32 *state, u8 *dst, const u8 *src,
 {
 	__le32 stream[SALSA20_BLOCK_SIZE / sizeof(__le32)];
 
-	if (dst != src)
-		memcpy(dst, src, bytes);
-
 	while (bytes >= SALSA20_BLOCK_SIZE) {
 		salsa20_block(state, stream);
-		crypto_xor(dst, (const u8 *)stream, SALSA20_BLOCK_SIZE);
+		crypto_xor_cpy(dst, src, (const u8 *)stream,
+			       SALSA20_BLOCK_SIZE);
 		bytes -= SALSA20_BLOCK_SIZE;
 		dst += SALSA20_BLOCK_SIZE;
+		src += SALSA20_BLOCK_SIZE;
 	}
 	if (bytes) {
 		salsa20_block(state, stream);
-		crypto_xor(dst, (const u8 *)stream, bytes);
+		crypto_xor_cpy(dst, src, (const u8 *)stream, bytes);
 	}
 }
Signature · 1 line
2.21.0
maintainer
#1 lore raw
Quoted 9 lines · Eric Biggers

From: Eric Biggers <[email protected]>

In salsa20_docrypt(), use crypto_xor_cpy() instead of crypto_xor(). This avoids having to memcpy() the src buffer to the dst buffer.

Signed-off-by Eric Biggers <[email protected]>
---
 crypto/salsa20_generic.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

Patch applied. Thanks.

Signature · 3 lines
Email: Herbert Xu <[email protected]>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt