code: public BigInteger readMPINT() throws IOException {
  		short bits = readShort();
  
  		byte[] raw = new byte[(bits + 7) / 8 + 1];
  
  		raw[0] = 0;
  		readFully(raw, 1, raw.length - 1);
  
  		return new BigInteger(raw);
  	}
docs: Reads a standard SSH1 MPINT using the first 16 bits as the length prefix
  
  @return
  @throws IOException