//3DES算法，CBC模式无填充方式解密过程

public static String decryptMode( byte[] src) throws Exception {

  String decryptByte = null;  final String keyBase64 = "Base64编码后的key";  final String ivBase64 = "Base64编码后的iv向量";  byte[] keybyte = getFromBASE64(keyBase64);  byte[] ivbyte = getFromBASE64(ivBase64);  SecureRandom sr = new SecureRandom();  DESedeKeySpec dks = new DESedeKeySpec(keybyte);  SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DESede");  SecretKey securekey = keyFactory.generateSecret(dks);  IvParameterSpec iv = new IvParameterSpec(ivbyte);  Cipher cipher = Cipher.getInstance("DESede/CBC/NoPadding");  cipher.init(Cipher.DECRYPT_MODE, securekey, iv);  decryptByte = new String(cipher.doFinal(src),"UTF-8");  return decryptByte; } // 将 BASE64 编码的字符串s 进行解码  public static byte[] getFromBASE64(String s) throws Exception {         return (new BASE64Decoder()).decodeBuffer(s);    }

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