+
+ #[test]
+ fn encrypt_single_block_in_place() {
+ let key = [
+ 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+ 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
+ 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
+ 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
+ ];
+ let nonce = [
+ 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
+ 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
+ ];
+ let unencrypted_bytes = [1; 32];
+ let mut bytes = unencrypted_bytes;
+
+ ChaCha20::encrypt_single_block_in_place(&key, &nonce, &mut bytes);
+ assert_ne!(bytes, unencrypted_bytes);
+
+ ChaCha20::encrypt_single_block_in_place(&key, &nonce, &mut bytes);
+ assert_eq!(bytes, unencrypted_bytes);
+ }