crypto: chacha-generic - use crypto_xor_cpy() (29d97dec) · Commits · 戴 / test

In chacha_docrypt(), use crypto_xor_cpy() instead of crypto_xor(). This avoids having to memcpy() the src buffer to the dst buffer. Signed-off-by:

crypto/chacha_generic.c

+3 −5

Original line number	Diff line number	Diff line
		@@ -22,18 +22,16 @@ static void chacha_docrypt(u32 state, u8 dst, const u8 *src,
		/* aligned to potentially speed up crypto_xor() */
		u8 stream[CHACHA_BLOCK_SIZE] __aligned(sizeof(long));

		if (dst != src)
		memcpy(dst, src, bytes);

		while (bytes >= CHACHA_BLOCK_SIZE) {
		chacha_block(state, stream, nrounds);
		crypto_xor(dst, stream, CHACHA_BLOCK_SIZE);
		crypto_xor_cpy(dst, src, stream, CHACHA_BLOCK_SIZE);
		bytes -= CHACHA_BLOCK_SIZE;
		dst += CHACHA_BLOCK_SIZE;
		src += CHACHA_BLOCK_SIZE;
		}
		if (bytes) {
		chacha_block(state, stream, nrounds);
		crypto_xor(dst, stream, bytes);
		crypto_xor_cpy(dst, src, stream, bytes);
		}
		}