f - use encrypt_single_block_in_place

Author: jkczyz

lightning/src/ln/inbound_payment.rs

@@ -90,11 +90,7 @@ impl ExpandedKey {
 	/// Encrypts or decrypts the given `bytes`. Used for data included in an offer message's
 	/// metadata (e.g., payment id).
 	pub(crate) fn crypt_for_offer(&self, mut bytes: [u8; 32], nonce: Nonce) -> [u8; 32] {
-		let chacha_block = ChaCha20::get_single_block(&self.offers_encryption_key, &nonce.0);
-		for i in 0..bytes.len() {
-			bytes[i] = chacha_block[i] ^ bytes[i];
-		}
-
+		ChaCha20::encrypt_single_block_in_place(&self.offers_encryption_key, &nonce.0, &mut bytes);
 		bytes
 	}
 }