code: function Key( options ) {
  
    if( !(this instanceof Key) )
      return new Key( options )
  
    this.version = null
    this.type = 'rsa-sha256'
    this.flags = null
    this.granularity = null
    this.hash = null
    this.notes = null
    this.service = null
    this.key = null
  
    var self = this
  
    if( options != null ) {
      Object.keys( options ).forEach( function( k, v ) {
        if( Key.fields.indexOf( k ) !== -1 ) {
          self[ k ] = options[ k ]
        }
      })
    }
  
  }
docs: Key Constructor
  @return {Key}