Java DES加密解密

import javax.crypto.Cipher;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.spec.IvParameterSpec;

public class DesUtils
{
    private String desKEY;
    public DesUtils() {
    }

    public String getDesKEY() {
        return desKEY;
    }

    public void setDesKEY(String desKEY) {
        this.desKEY = desKEY;
    }

    public String encrypt(String message) throws Exception {
        Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
        DESKeySpec desKeySpec = new DESKeySpec(desKEY.getBytes("UTF-8"));
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
        javax.crypto.SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
        IvParameterSpec iv = new IvParameterSpec(desKEY.getBytes("UTF-8"));
        cipher.init(1, secretKey, iv);
        return toHexString(cipher.doFinal(message.getBytes("UTF-8")));
    }

    public String decrypt(String message) throws Exception {
        byte bytesrc[] = convertHexString(message);
        Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
        DESKeySpec desKeySpec = new DESKeySpec(desKEY.getBytes("UTF-8"));
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
        javax.crypto.SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
        IvParameterSpec iv = new IvParameterSpec(desKEY.getBytes("UTF-8"));
        cipher.init(2, secretKey, iv);
        byte retByte[] = cipher.doFinal(bytesrc);
        return new String(retByte);
    }

    private byte[] convertHexString(String ss) {
        byte digest[] = new byte[ss.length() / 2];
        for(int i = 0; i < digest.length; i++) {
            String byteString = ss.substring(2 * i, 2 * i + 2);
            int byteValue = Integer.parseInt(byteString, 16);
            digest[i] = (byte)byteValue;
        }

        return digest;
    }

    private 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 = (new StringBuilder("0")).append(plainText).toString();
            hexString.append(plainText);
        }

        return hexString.toString();
    }
}