Pure dart dtls

[vincent-iQontrol]

Is it possible to use just pure dart for DTLS instead of openssl like this:

`
import 'dart:io';
import 'dart:async';

Future createDtlsConnection() async {
// Create a SecurityContext object
final securityContext = SecurityContext();
securityContext.setAlpnProtocols(['dtls1.2'], true);
securityContext.setPSKIdentity("client_identity");
securityContext.setPSK("client_secret".codeUnits);

// Create a SecureSocket object
final socket = await SecureSocket.connect(
'dtls.example.com', 
8443, 
context: securityContext,
);

// Send and receive data over the socket
socket.write('Hello, DTLS!');
final response = await socket.read();
print(String.fromCharCodes(response));

}
`

or

`import 'dart:io';
import 'dart:async';

Future createDtlsConnection() async {
// Load the certificate and private key from files
final certificate = await File('path/to/certificate.pem').readAsString();
final privateKey = await File('path/to/private_key.pem').readAsString();
final caCertificate = await File('path/to/ca_certificate.pem').readAsString();

// Create a SecurityContext object
final securityContext = SecurityContext();
securityContext.useCertificateChainBytes(certificate.codeUnits);
securityContext.usePrivateKeyBytes(privateKey.codeUnits);
securityContext.setTrustedCertificatesBytes(caCertificate.codeUnits);

// Create a SecureSocket object
final socket = await SecureSocket.connect(
'dtls.example.com',
8443,
context: securityContext,
);

// Send and receive data over the socket
socket.write('Hello, DTLS!');
final response = await socket.read();
print(String.fromCharCodes(response));
}`

[JKRhb]

That is definitely the goal and would be very desirable! However, the SecureSocket class from dart:io currently only supports TLS, therefore the code you posted does not work at the moment :/ (Also see this issue: dart-lang/sdk#43378) However, based on the foundations laid in the DTLS packages, maybe it will be possible to create an integration into the Dart SDK in the not too distant future :)

[KellyKinyama]

Some progress on dtls on this repo https://github.com/KellyKinyama/dart-tls . The repo contains a dtls server that is about to perfom a handshake such that the client even manages to send a finished handshake message.