/*
  http-realm - Authentication Extensions to jdk.httpserver
  Copyright (C) 2021  Ulrich Hilger

  This program is free software: you can redistribute it and/or modify
  it under the terms of the GNU Affero General Public License as
  published by the Free Software Foundation, either version 3 of the
  License, or (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU Affero General Public License for more details.

  You should have received a copy of the GNU Affero General Public License
  along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
package de.uhilger.httpserver.auth.realm;

import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

/**
 *
 * @author ulrich
 */
public class Encoder {

  private static final byte[] HEX_ARRAY = "0123456789ABCDEF".getBytes(StandardCharsets.US_ASCII);
  
  public byte[] encode(String password) throws NoSuchAlgorithmException {
    MessageDigest md = MessageDigest.getInstance("SHA-256");
    return md.digest(password.getBytes());
  }

  public String bytesToHex(byte[] bytes) {
      byte[] hexChars = new byte[bytes.length * 2];
      for (int j = 0; j < bytes.length; j++) {
          int v = bytes[j] & 0xFF;
          hexChars[j * 2] = HEX_ARRAY[v >>> 4];
          hexChars[j * 2 + 1] = HEX_ARRAY[v & 0x0F];
      }
      return new String(hexChars, StandardCharsets.UTF_8);
  }  
}