1 files changed, 3 insertions, 6 deletions
diff --git a/src/add_felicsref/cipher.c b/src/add_felicsref/cipher.c
index 87689df..916f0ab 100644
--- a/src/add_felicsref/cipher.c
+++ b/src/add_felicsref/cipher.c
@@ -168,18 +168,15 @@ void lilliput_tbc_decrypt(
     uint8_t message[BLOCK_BYTES]
 )
 {
-    uint8_t X[BLOCK_BYTES];
-    _state_init(X, ciphertext);
+    _state_init(message, ciphertext);
 
     uint8_t RTK[ROUNDS][ROUND_TWEAKEY_BYTES];
     _compute_round_tweakeys(key, tweak, RTK);
 
     for (size_t i=0; i<ROUNDS-1; i++)
     {
-        _one_round_egfn(X, RTK[ROUNDS-1-i], PERMUTATION_DECRYPTION);
+        _one_round_egfn(message, RTK[ROUNDS-1-i], PERMUTATION_DECRYPTION);
     }
 
-    _one_round_egfn(X, RTK[0], PERMUTATION_NONE);
-
-    memcpy(message, X, BLOCK_BYTES);
+    _one_round_egfn(message, RTK[0], PERMUTATION_NONE);
 }