架构师训练营 - 命题作业 第 11 周

Boolean checkPW(String userID, String password, String encryPwd) {
    String encryPwdNew = stringToMD5(password + userID + "-Salt");
    return password.equalsIgnoreCase(encryPwdNew);
}
static String stringToMD5(String plainText) {
    byte[] secretBytes = null;
    try {
        secretBytes = MessageDigest.getInstance("md5").digest(
                plainText.getBytes());
    } catch (NoSuchAlgorithmException e) {
        throw new RuntimeException("没有这个md5算法！");
    }
    String md5code = new BigInteger(1, secretBytes).toString(16);
    for (int i = 0; i < 32 - md5code.length(); i++) {
        md5code = "0" + md5code;
    }
    return md5code;
}