From 29d97dec22dde5d2c4ccb23c50a11e94a5911861 Mon Sep 17 00:00:00 2001 From: Eric Biggers Date: Thu, 14 Mar 2019 21:20:36 -0700 Subject: crypto: chacha-generic - use crypto_xor_cpy() 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: Eric Biggers Signed-off-by: Herbert Xu --- crypto/chacha_generic.c | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-) (limited to 'crypto/chacha_generic.c') diff --git a/crypto/chacha_generic.c b/crypto/chacha_generic.c index 90ec0ec1b4f7..a7fae9b73ec4 100644 --- a/crypto/chacha_generic.c +++ b/crypto/chacha_generic.c @@ -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); } } -- cgit v1.2.3