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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);
  }  
}