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import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public final class HashExamples {
  private String salt = "ia0942980234241sadfaewvo32"; //Randomly generated

  private void setPassword(String pass) throws Exception {
    MessageDigest sha_1 = MessageDigest.getInstance("SHA-1");
    byte[] hashVal = sha_1.digest((pass+salt).getBytes()); //encode the string and salt
    saveBytes(hashVal,"credentials.pw"); //save the hash value to credentials.pw
  }

  private boolean checkPassword(String pass) throws Exception {
    MessageDigest sha_1 = MessageDigest.getInstance("SHA-1");
    byte[] hashVal1 = sha_1.digest((pass+salt).getBytes()); //encode the string and salt
    byte[] hashVal2 = loadBytes("credentials.pw"); //load the hash value stored in credentials.pw
    return Arrays.equals(hashVal1, hashVal2);
  }
}