JAVA DES復号化ツール類

import javax.crypto.Cipher;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.spec.IvParameterSpec;
import java.security.Key;
import java.util.Base64;

public class DESUtil {
    //    ，   8   
    private final static String IV_PARAMETER = "12345678";
    //    
    private static final String ALGORITHM = "DES";
    //  /    -    -    
    private static final String CIPHER_ALGORITHM = "DES/CBC/PKCS5Padding";
    //    
    private static final String CHARSET = "utf-8";
    //  
    private static final String PASSWORD = "12345678";
    //         ，               
    private static final Key key = generateKey(PASSWORD);

    /**
     *      key
     *
     * @param password   
     */
    private static Key generateKey(String password) {
        try {
            DESKeySpec dks = new DESKeySpec(password.getBytes(CHARSET));
            SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(ALGORITHM);
            return keyFactory.generateSecret(dks);
        } catch (Exception ex) {
            return null;
        }
    }


    /**
     * DES     
     *
     * @param data       
     * @return      
     */
    public static String encrypt(String data) {
        if (data == null)
            return null;
        try {
            Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
            IvParameterSpec iv = new IvParameterSpec(IV_PARAMETER.getBytes(CHARSET));
            cipher.init(Cipher.ENCRYPT_MODE, key, iv);
            byte[] bytes = cipher.doFinal(data.getBytes(CHARSET));
            return new String(Base64.getEncoder().encode(bytes));
        } catch (Exception e) {
            return data;
        }
    }

    /**
     * DES     
     *
     * @param data       
     * @return      
     */
    public static String decrypt(String data) {
        if (data == null)
            return null;
        try {
            Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
            IvParameterSpec iv = new IvParameterSpec(IV_PARAMETER.getBytes(CHARSET));
            cipher.init(Cipher.DECRYPT_MODE, key, iv);
            return new String(cipher.doFinal(Base64.getDecoder().decode(data.getBytes(CHARSET))), CHARSET);
        } catch (Exception e) {
            return data;
        }
    }

}