架构师训练营 -week11- 作业

public class ValidateDemo {  public static String SALT = "20201204";  public static String ALGORITHM = "SHA-256";
  /**   * 加盐进行加密，实际中，可以使用用户的手机号的几位作为salt   * 采用SHA-256算法   * @param pwd   * @return   * @throws NoSuchAlgorithmException   */  public String encrypt(String pwd) throws NoSuchAlgorithmException {    MessageDigest md = MessageDigest.getInstance(ALGORITHM);    byte[] srcBytes = (pwd + SALT).getBytes();    md.reset();    //使用srcBytes更新摘要    md.update(srcBytes);    //完成哈希计算，得到result    byte[] resultBytes = md.digest();    //BASE64，把二进制转换为字符串    String resultStr = Base64.getEncoder().encodeToString(resultBytes);    System.out.println("plain text: " + pwd);    System.out.println("encrypt text: " + resultStr);    return resultStr;  }
  public boolean checkPW(String userId, String pwd, String encryptPwd) throws NoSuchAlgorithmException {    String tempPwd = encrypt(pwd);    if (tempPwd.equals(encryptPwd)) return true;    return false;  }
  public static void main(String[] args) throws NoSuchAlgorithmException {    ValidateDemo demo = new ValidateDemo();    String encryptPwd = demo.encrypt("admin123");    boolean result = demo.checkPW("admin", "admin123", encryptPwd);    System.out.println(result);  }