chacha20: use memmove in case buffers overlap

Suggested-by: Samuel Neves <sneves@dei.uc.pt>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/crypto/chacha20.c b/src/crypto/chacha20.c
index 29f7e6b..815d777 100644
--- a/src/crypto/chacha20.c
+++ b/src/crypto/chacha20.c
@@ -137,7 +137,7 @@ static void chacha20_generic(u8 *out, const u8 *in, u32 len, const u32 key[8], c
 	};
 
 	if (out != in)
-		memcpy(out, in, len);
+		memmove(out, in, len);
 
 	while (len >= CHACHA20_BLOCK_SIZE) {
 		chacha20_block_generic(buf, x);