code: public static byte[] publicKeyFromPrivate(BigInteger privKey, boolean compressed) {
          ECPoint point = CURVE.getG().multiply(privKey);
          return point.getEncoded(compressed);
      }
docs: Returns public key bytes from the given private key. To convert a byte array
  into a BigInteger, use <tt>
  new BigInteger(1, bytes);</tt>
  
  @param privKey
  -
  @param compressed
  -
  @return -