java
中 3des加密 默认是24位秘钥的
现在需求是 32位秘钥加密
尝试很多种方法 解决 结果都不正确

// 密钥  
    
    private final static String secretKey = "11111111111111111111111111111111";  
    // 向量  
//    private final static String iv = "01234567";  
    // 加解密统一使用的编码方式  
    private final static String encoding = "utf-8";  
  
    /** 
     * 3DES加密 
     *  
     * @param plainText 普通文本 
     * @return 
     * @throws Exception  
     */  
    public static String encode(String plainText) throws Exception {  
        Key deskey = null;  
        DESedeKeySpec spec = new DESedeKeySpec(secretKey.getBytes());  
        SecretKeyFactory keyfactory = SecretKeyFactory.getInstance("desede");  
        deskey = keyfactory.generateSecret(spec);  
        Cipher cipher = Cipher.getInstance("desede/CBC/PKCS5Padding");  
//        IvParameterSpec ips = new IvParameterSpec(iv.getBytes());  
        cipher.init(Cipher.ENCRYPT_MODE, deskey);  
        byte[] encryptData = cipher.doFinal(plainText.getBytes(encoding));  
        return Deal8583.byte2HexStr(encryptData);  
    }  
  
    /** 
     * 3DES解密 
     *  
     * @param encryptText 加密文本 
     * @return 
     * @throws Exception 
     */  
    public static String decode(String encryptText) throws Exception {  
        Key deskey = null;  
        DESedeKeySpec spec = new DESedeKeySpec(secretKey.getBytes());  
        SecretKeyFactory keyfactory = SecretKeyFactory.getInstance("desede");  
        deskey = keyfactory.generateSecret(spec);  
        Cipher cipher = Cipher.getInstance("desede/CBC/PKCS5Padding");  
//        IvParameterSpec ips = new IvParameterSpec(iv.getBytes());  
        cipher.init(Cipher.DECRYPT_MODE, deskey);  
        byte[] decryptData = cipher.doFinal(Base64.decode(encryptText));  
        return new String(decryptData, encoding);  
    }

我该 怎么处理？