如何讓JCE能解開256-bit AES的密文

加密方法：
cipher = Cipher.getInstance("AES");

key=64e02d09a471f3b80063ea6141cd29d80fb9d6e4909a7f4230071c5af15a7929

cipher=dd7c14259d182026eea41026ab72059c5fcc8e884d9665b7a00908c92794a771efa40b97451b044d25ac17529bb80e06

plaintext=?