HarmonyOS 密码怎么进行MD5加密

java场景下对密码加密代码如下：

public static String computeOnce(String str) {
  MessageDigest md5 = null;
  try {
    md5 = MessageDigest.getInstance("MD5");
  } catch (Exception e) {
    System.out.println(e.toString());
    e.printStackTrace();
    return null;
  }
  char[] charArray = str.toCharArray();
  byte[] byteArray = new byte[charArray.length];
  for (int i = 0; i < charArray.length; i++) {
    byteArray[i] = (byte) charArray[i];
  }
  byte[] md5Bytes = md5.digest(byteArray);
  StringBuffer hexValue = new StringBuffer();
  for (int i = 0; i < md5Bytes.length; i++) {
    int val = ((int) md5Bytes[i]) & 0xff;
    if (val < 16) {
      hexValue.append("0");
    }
    hexValue.append(Integer.toHexString(val));
  }
  return hexValue.toString();
}

请问HarmonyOS怎么对密码进行加密？