Convert a javascript code to generate a self signed x509 certificate to dart

I am looking for a skilled freelancer who can convert a JavaScript code that generates a self-signed x509 certificate to Dart. This conversion is needed for the purpose of secure communication. The code should work both for Android and iOS (not web).

Skills and experience required:
- Dart programming language
- Understanding of x509 certificates and SSL/TLS implementation
- JavaScript

Relevant code shared when the offer is accepted.

Anyway, we are talking about:

crypto.subtle.generateKey, x509.X509CertificateGenerator.createSelfSigned, crypto.subtle.exportKey

The deadline for completing the conversion is 2 days.

Thank you