function writePkcs1DSAPrivate(der, key) {
	var ver = Buffer.from([0]);
	der.writeBuffer(ver, asn1.Ber.Integer);

	der.writeBuffer(key.part.p.data, asn1.Ber.Integer);
	der.writeBuffer(key.part.q.data, asn1.Ber.Integer);
	der.writeBuffer(key.part.g.data, asn1.Ber.Integer);
	der.writeBuffer(key.part.y.data, asn1.Ber.Integer);
	der.writeBuffer(key.part.x.data, asn1.Ber.Integer);
}
Register callback `fn` for the command.

Examples:

     program
       .command('help')
       .description('display verbose help')
       .action(function() {
          // output help here
       });

@param {Function} fn
@return {Command} for chaining
@api public