架构师训练营 - 第十一周作业

public class CryptoUtil {
    private static final String SECRET_KEY = "geekbang";    private static final String ALGORITHM_MAC = "HmacMD5";
    public static boolean checkPW(String userId, String password, String cryptoPassword) {        String data = new StringBuilder(userId).append(password).toString();
        try {            String encryptPassword = encryptHMAC(data, SECRET_KEY);            return cryptoPassword.equals(encryptPassword);        } catch (Exception e) {            e.printStackTrace();
            return false;        }    }
    public static String encryptHMAC(String source, String authKey) throws Exception {        byte[] dataBytes = source.getBytes("UTF-8");        SecretKey secretKey = new SecretKeySpec(authKey.getBytes("UTF-8"), ALGORITHM_MAC);        Mac mac = Mac.getInstance(secretKey.getAlgorithm());        mac.init(secretKey);        byte[] cryptoBytes = mac.doFinal(dataBytes);
        return getHexStr(cryptoBytes);    }
    public static String getHexStr(byte[] b) {        String tempstr = "", str = "";        for (int i = 0; i < b.length; i++) {            tempstr = Integer.toHexString(b[i] & 0xFF);            if (tempstr.length() == 1) {                str += "0" + tempstr;            } else {                str += tempstr;            }            if ((i + 1) % 16 == 0) {                str += "/n";            }        }
        return str;    }
    public static void main(String[] args) throws Exception {        String data = new StringBuilder("604678935").append("123456789").toString();        System.out.println(encryptHMAC(data, SECRET_KEY));
        System.out.println(checkPW("604678935", "123456789", "d80fcc928db28e7a1481693ddbf44163/n"));    }}