certificate.js

function Certificate(Buffer || String) {
  this.issuer = '';
  this.before = new Date();
  this.after = new Date();
  this.serial = '';
  this.subject = '';
  this.algorithm = '';
  this.signature = new Buffer();
}
Certificate.prototype.validOn(date) { return true; }
// maybe 'pem'?
Certificate.prototype.toString(<encoding>) { return ''; }
Certificate.prototype.toBuffer() { return new Buffer(); }