11 周作业

import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
public class Test {
    public static void main(String[] args) {
        Boolean bool = checkPW("test","password","8c768d60c5d9d876309ea3de0c4b8de6");
        System.out.println(bool);
    }
    public static Boolean checkPW (String userId, String plaintext,String cipherText) {
        String cipherTextGenerate = md5(plaintext);
        if(cipherTextGenerate.equals(cipherText)){
            return Boolean.TRUE;
        }
        return Boolean.FALSE;
    }
    /**
     * 密码加密
     * @param plaintext 明文
     * @return 加密后的密码
     */
    public static String md5(String plaintext){
        try {
            String slat = "slat";
            plaintext = plaintext + slat;
            MessageDigest m = MessageDigest.getInstance("MD5");
            m.update(plaintext.getBytes(StandardCharsets.UTF_8));
            byte[] s = m.digest();
            StringBuilder result = new StringBuilder();
            for (byte b : s) {
                result.append(Integer.toHexString((0x000000FF & b) | 0xFFFFFF00).substring(6));
            }
            return result.toString();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return "";
    }
}