Node.js tlsSocket.getFinished() Method
The tlsSocket.getFinished() is an inbuilt application programming interface of class TLSSocket within tls module which is used to return a latest Finished message that has been sent to the socket as part of a SSL/TLS handshake, or undefined if no Finished message has been sent yet.
Syntax:
const tlsSocket.getFinished()
Parameters: This method does not accept any parameter.
Return Value: This method returns an buffer object containing message digests of the complete handshake.
How to generate private key and public certificate?
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Private key: Open notepad and copy paste the following key:
-----BEGIN RSA PRIVATE KEY----- MIICXQIBAAKBgQC38R9wXcUbhOd44FavgmE5R3K4JeYOHLnI7dUq1B8/Gv7l3SOg JKef/m9gM1KvUx951mapXGtcWgwB08J3vUE2YOZ4tWJArrVZES0BI/RmFAyhQFP5 HcWl3LSM9LRihP98F33oIkKaCxA5LxOrkgpV4HrUzIKTABDYah7RPex1WQIDAQAB AoGBAIXR71xxa9gUfc5L7+TqBs+EMmrUb6Vusp8CoGXzQvRHMJCMrMFySV0131Nu o0YYRDsAh1nJefYLMNcXd1BjqI+qY8IeRsxaY+9CB2KKGVVDO2uLdurdC2ZdlWXT Vwr3dDoyR0trnXJMmH2ijTeO6bush8HuXxvxJBjvEllM5QYxAkEA3jwny9JP+RFu 0rkqPBe/wi5pXpPl7PUtdNAGrh6S5958wUoR4f9bvwmTBv1nQzExKWu4EIp+7vjJ fBeRZhnBvQJBANPjjge8418PS9zAFyKlITq6cxmM4gOWeveQZwXVNvav0NH+OKdQ sZnnDiG26JWmnD/B8Audu97LcxjxcWI8Jc0CQEYA5PhLU229lA9EzI0JXhoozIBC TlcKFDuLm88VSmlHqDyqvF9YNOpEdc/p2rFLuZS2ndB4D+vu6mjwc5iZ3HECQCxy GBHRclQ3Ti9w76lpv+2kvI4IekRMZWDWnnWfwta+DGxwCgw2pfpleBZkWqdBepb5 JFQbcxQJ0wvRYXo8qaUCQQCgTvWswBj6OTP7LTvBlU1teAN2Lnrk/N5AYHZIXW6m nUG9lYvH7DztWDTioXMrruPF7bdXfZOVJD8t0I4OUzvC -----END RSA PRIVATE KEY-----
Save file as private-key.pem
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Public certificate: Open notepad and copy paste the following key:
-----BEGIN CERTIFICATE----- MIICfzCCAegCCQDxxeXw914Y2DANBgkqhkiG9w0BAQsFADCBgzELMAkGA1UEBhMC SU4xEzARBgNVBAgMCldlc3RiZW5nYWwxEDAOBgNVBAcMB0tvbGthdGExFDASBgNV BAoMC1BhbmNvLCBJbmMuMRUwEwYDVQQDDAxSb2hpdCBQcmFzYWQxIDAeBgkqhkiG 9w0BCQEWEXJvZm9mb2ZAZ21haWwuY29tMB4XDTIwMDkwOTA1NTExN1oXDTIwMTAw OTA1NTExN1owgYMxCzAJBgNVBAYTAklOMRMwEQYDVQQIDApXZXN0YmVuZ2FsMRAw DgYDVQQHDAdLb2xrYXRhMRQwEgYDVQQKDAtQYW5jbywgSW5jLjEVMBMGA1UEAwwM Um9oaXQgUHJhc2FkMSAwHgYJKoZIhvcNAQkBFhFyb2ZvZm9mQGdtYWlsLmNvbTCB nzANBgkqhkiG9w0BAQEFAAOBjQAwgYkCgYEAt/EfcF3FG4TneOBWr4JhOUdyuCXm Dhy5yO3VKtQfPxr+5d0joCSnn/5vYDNSr1MfedZmqVxrXFoMAdPCd71BNmDmeLVi QK61WREtASP0ZhQMoUBT+R3Fpdy0jPS0YoT/fBd96CJCmgsQOS8Tq5IKVeB61MyC kwAQ2Goe0T3sdVkCAwEAATANBgkqhkiG9w0BAQsFAAOBgQATe6ixdAjoV7BSHgRX bXM2+IZLq8kq3s7ck0EZrRVhsivutcaZwDXRCCinB+OlPedbzXwNZGvVX0nwPYHG BfiXwdiuZeVJ88ni6Fm6RhoPtu2QF1UExfBvSXuMBgR+evp+e3QadNpGx6Ppl1aC hWF6W2H9+MAlU7yvtmCQQuZmfQ== -----END CERTIFICATE-----
Save file as public-cert.pem
Example 1: Filename: index.js
// Node.js program to demonstrate the // tlsSocket.getFinished() method var tls = require( 'tls' ), fs = require( 'fs' ), // Port and host address for server PORT = 1337, HOST = '127.0.0.1' , value = null ; // Private key and public certificate for access var options = { key: fs.readFileSync( 'private-key.pem' ), cert: fs.readFileSync( 'public-cert.pem' ), rejectUnauthorized: false }; // Creating and initializing server var server = tls.createServer(options, function (socket) { // Print the data that we received socket.on( 'data' , function (data) { console.log( '\nReceived: %s ' , data.toString().replace(/(\n)/gm, "" )); }); // Stopping the server // by using the close() method server.close(() => { console.log( "Server closed successfully" ); }); }); // Start listening on a specific port and address // by using listen() method server.listen(PORT, HOST, function () { console.log( "I'm listening at %s, on port %s" , HOST, PORT); }); // Creating and initializing client var client = tls.connect(PORT, HOST, options, function () { // Getting finished message digest // by using tlsSocket.getFinished() method value = client.getFinished(); client.write( "Finisher message : " + value.toJSON().data); client.end(() => { console.log( "Client closed successfully" ); }); }); |
Run the index.js file using the following command:
node index.js
Output:
I’m listening at 127.0.0.1, on port 1337
Client closed successfullyReceived: Finisher message : 94, 70, 57, 175, 148, 249, 68, 105, 31, 68, 140, 250, 69, 62, 43, 163, 23, 102, 77, 110, 31, 208, 216, 84, 58, 52, 150, 169, 151, 237, 253, 44, 21, 240, 151, 114, 100, 227, 211, 77, 192, 144, 163, 118, 199, 174, 88, 190
Server closed successfully
Example 2: Filename: index.js
// Node.js program to demonstrate the // tlsSocket.getFinished() API var tls = require( 'tls' ), fs = require( 'fs' ), // Port and host address for server PORT = 1337, HOST = '127.0.0.1' ; // Private key and public certificate for access var options = { key: fs.readFileSync( 'private-key.pem' ), cert: fs.readFileSync( 'public-cert.pem' ), rejectUnauthorized: false }; // Creating and initializing server var server = tls.createServer(options, function (socket) { // Getting finished message digest // by using tlsSocket.getFinished() method value = socket.getFinished(); socket.write( "Finisher message : " + value.toJSON().data); // Stopping the server // by using the close() method server.close(() => { console.log( "Server closed successfully" ) }); }); // Start listening on a specific port and address // by using listen() method server.listen(PORT, HOST, function () { console.log( "I'm listening at %s, on port %s" , HOST, PORT); }); // Creating and initializing client var client = tls.connect(PORT, HOST, options, function () { console.log( "client is connected" ); }); client.on( "data" , function (data) { console.log('Received: %s', data.toString().replace(/(\n)/gm, "" )); // Close the connection after receiving the message client.end(() => { console.log( "client closed successfully" ) }); }); |
Run the index.js file using the following command:
node index.js
Output:
I’m listening at 127.0.0.1, on port 1337
client is connected
Received: Finisher message : 154, 53, 171, 177, 191, 48, 163, 116, 36, 25, 186, 97, 168, 169, 65, 145, 207, 125, 254, 4, 245, 250, 159, 172, 216, 131, 25, 98, 45, 70, 209, 245, 162, 85, 97, 220, 178, 79, 106, 33, 13, 179, 182, 14, 186, 87, 46, 118
client closed successfully
Server closed successfully
Reference: https://nodejs.org/dist/latest-v12.x/docs/api/tls.html#tls_tlssocket_getfinished
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