docs: function RSAEncryptPrivate(text) {
    var m = pkcs1pad2(text,(this.n.bitLength()+7)>>3);
    if(m == null) return null;
    var c = this.doPrivate(m);
    if(c == null) return null;
    var h = c.toString(16);
    if((h.length & 1) == 0) return h; else return "0" + h;
  }