http-mitm-proxy 0.18.0

A HTTP proxy server library intended to be a backend of application like Burp proxy.
Documentation 
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#[derive(Debug, Clone)]
pub struct CertifiedKeyDer {
    pub cert_der: Vec<u8>,
    /// Pkcs8
    pub key_der: Vec<u8>,
}

pub fn generate_cert(
    host: String,
    issuer: &rcgen::Issuer<rcgen::KeyPair>,
) -> Result<CertifiedKeyDer, rcgen::Error> {
    let mut cert_params = rcgen::CertificateParams::new(vec![host.clone()])?;
    cert_params
        .key_usages
        .push(rcgen::KeyUsagePurpose::DigitalSignature);
    cert_params
        .extended_key_usages
        .push(rcgen::ExtendedKeyUsagePurpose::ServerAuth);
    cert_params
        .extended_key_usages
        .push(rcgen::ExtendedKeyUsagePurpose::ClientAuth);
    cert_params.distinguished_name = {
        let mut dn = rcgen::DistinguishedName::new();
        dn.push(rcgen::DnType::CommonName, host);
        dn
    };

    let key_pair = rcgen::KeyPair::generate()?;

    let cert = cert_params.signed_by(&key_pair, issuer)?;

    Ok(CertifiedKeyDer {
        cert_der: cert.der().to_vec(),
        key_der: key_pair.serialize_der(),
    })
}