JAVA工具类-DES加密解密

客官°小女子只卖身不卖艺 2021-09-27 08:46 432阅读 0赞

import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    
    import javax.crypto.Cipher;
    import javax.crypto.SecretKey;
    import javax.crypto.SecretKeyFactory;
    import javax.crypto.spec.DESKeySpec;
    import java.security.SecureRandom;
    
    /** * @author yunfeng * @version V1.0 * @date 2018-06-07 22:13 */
    public class DesUtil { 
        private final static Logger logger = LoggerFactory.getLogger(DesUtil.class);
    
        /** * 加密 * * @param datasource byte[] * @param password String * @return byte[] */
        public static byte[] encrypt(byte[] datasource, String password) {
            try {
                SecureRandom random = new SecureRandom();
                DESKeySpec desKey = new DESKeySpec(password.getBytes());
                //创建一个密匙工厂，然后用它把DESKeySpec转换成
                SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
                SecretKey securekey = keyFactory.generateSecret(desKey);
                //Cipher对象实际完成加密操作
                Cipher cipher = Cipher.getInstance("DES");
                //用密匙初始化Cipher对象,ENCRYPT_MODE用于将 Cipher 初始化为加密模式的常量
                cipher.init(Cipher.ENCRYPT_MODE, securekey, random);
                //现在，获取数据并加密 正式执行加密操作
                //按单部分操作加密或解密数据，或者结束一个多部分操作
                return cipher.doFinal(datasource);
            } catch (Throwable e) {
                logger.error("DES 加密异常，详情：" + e.toString());
                e.printStackTrace();
            }
            return null;
        }
    
        /** * 解密 * * @param src byte[] * @param password String * @return byte[] * @throws Exception */
        public static byte[] decrypt(byte[] src, String password) throws Exception {
            // DES算法要求有一个可信任的随机数源
            SecureRandom random = new SecureRandom();
            // 创建一个DESKeySpec对象
            DESKeySpec desKey = new DESKeySpec(password.getBytes());
            // 创建一个密匙工厂
            SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");//返回实现指定转换的 Cipher 对象
            // 将DESKeySpec对象转换成SecretKey对象
            SecretKey securekey = keyFactory.generateSecret(desKey);
            // Cipher对象实际完成解密操作
            Cipher cipher = Cipher.getInstance("DES");
            // 用密匙初始化Cipher对象
            cipher.init(Cipher.DECRYPT_MODE, securekey, random);
            // 真正开始解密操作
            return cipher.doFinal(src);
        }
    
    }