第十一周作业

package week11;
import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
/**
 * @program: GeekTest
 * @description:
 * @author: Meow_Young
 * @created: 2020/12/06 20:54
 */
public class UserService {
        public boolean checkPwd(String userId, String original, String encrypted) {
            String md5 = encrypt(original, getSalt(userId));
            return encrypted.equals(md5);
        }
        private String getSalt(String userId) {
            // 根据userid 获取 salt
            return userId;
        }
        private String encrypt(String original, String salt) {
            String passwordMd5 = null;
            try {
                MessageDigest md5 = MessageDigest.getInstance("MD5");
                byte[] bytes = md5.digest((original + salt).getBytes(StandardCharsets.UTF_8));
                passwordMd5 = new String(bytes);
            } catch (NoSuchAlgorithmException e) {
                e.printStackTrace();
            }
            return passwordMd5;
        }
    }