core/server_common/src/certificates.rs

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use rustls::pki_types::{CertificateDer, PrivateKeyDer};

/// Generates a self-signed certificate for the given domain.
/// Returns a tuple of (certificate chain, private key).
pub fn generate_self_signed_certificate(
    domain: &str,
) -> Result<(Vec<CertificateDer<'static>>, PrivateKeyDer<'static>), Box<dyn std::error::Error>> {
    let cert = rcgen::generate_simple_self_signed(vec![domain.to_string()])?;
    let cert_der = cert.cert.der();
    let key_der = cert.signing_key.serialize_der();
    let key = PrivateKeyDer::try_from(key_der)?;

    Ok((vec![cert_der.clone()], key))
}