Function write

bin/yarn-standalone.js:32490–32546

(key, options, type)

}

function write(key, options, type) {
	assert.object(key);

	var alg = {
	    'ecdsa': 'EC',
	    'rsa': 'RSA',
	    'dsa': 'DSA',
	    'ed25519': 'EdDSA'
	}[key.type];
	var header;

	var der = new asn1.BerWriter();

	if (PrivateKey.isPrivateKey(key)) {
		if (type && type === 'pkcs8') {
			header = 'PRIVATE KEY';
			pkcs8.writePkcs8(der, key);
		} else {
			if (type)
				assert.strictEqual(type, 'pkcs1');
			header = alg + ' PRIVATE KEY';
			pkcs1.writePkcs1(der, key);
		}

	} else if (Key.isKey(key)) {
		if (type && type === 'pkcs1') {
			header = alg + ' PUBLIC KEY';
			pkcs1.writePkcs1(der, key);
		} else {
			if (type)
				assert.strictEqual(type, 'pkcs8');
			header = 'PUBLIC KEY';
			pkcs8.writePkcs8(der, key);
		}

	} else {
		throw (new Error('key is not a Key or PrivateKey'));
	}

	var tmp = der.buffer.toString('base64');
	var len = tmp.length + (tmp.length / 64) +
	    18 + 16 + header.length*2 + 10;
	var buf = Buffer.alloc(len);
	var o = 0;
	o += buf.write('-----BEGIN ' + header + '-----\n', o);
	for (var i = 0; i < tmp.length; ) {
		var limit = i + 64;
		if (limit > tmp.length)
			limit = tmp.length;
		o += buf.write(tmp.slice(i, limit), o);
		buf[o++] = 10;
		i = limit;
	}
	o += buf.write('-----END ' + header + '-----\n', o);

	return (buf.slice(0, o));
}