android客户端手机号码解密方法(2)

            DESKeySpec localDESKeySpec = new DESKeySpec(key); 
            SecretKey localSecretKey = SecretKeyFactory.getInstance("DES") 
                    .generateSecret(localDESKeySpec); 
            Cipher localCipher = Cipher.getInstance("DES"); 
            localCipher.init(1, localSecretKey, localSecureRandom); 
            return localCipher.doFinal(paramArrayOfByte); 
        } catch (Exception e) { 
            e.printStackTrace(); 
            return null; 
        } 
    } 
     
    public static byte[] convertHexString(String text) { 
        byte digest[] = new byte[text.length() / 2]; 
        for (int i = 0; i < digest.length; i++) { 
            String byteString = text.substring(2 * i, 2 * i + 2); 
            int byteValue = Integer.parseInt(byteString, 16); 
            digest[i] = (byte) byteValue; 
        } 
        return digest; 
    } 
     
    public static String toHexString(byte b[]) { 
        StringBuffer hexString = new StringBuffer(); 
        for (int i = 0; i < b.length; i++) { 
            String plainText = Integer.toHexString(0xff & b[i]); 
            if (plainText.length() < 2) 
                plainText = "0" + plainText; 
            hexString.append(plainText); 
        } 
        return hexString.toString(); 
    } 
}