第 11 周

package com.geek.pwd;
import java.math.BigInteger;
import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
public class PasswordCheck{
    /**
     * 验证密码,验证通过返回true
     * @param userId
     * @param originPwd
     * @param encryptPwd
     * @return
     */
    public static boolean checkPwd(String userId, String originPwd, String encryptPwd){
        return encrypt(userId + originPwd).equals(encryptPwd);
    }
    /**
     * 密码生成算法
     * @param str
     * @return
     */
    private static String encrypt(String str){
        try {
            MessageDigest md = MessageDigest.getInstance("SHA-256");
            md.update(str.getBytes(StandardCharsets.UTF_8));
            byte[] result = md.digest();
            return new BigInteger(1,result).toString(16);
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
        return null;
    }
}