Rust Requires Chilkat v11.0.0+
Generate a CSR with SAN (Subject Alternative Name) Extension

Demonstrates how to generate a private key and a Certificate Signing Request (CSR) that includes the SAN extension.
Chilkat Rust Downloads

Rust

// This requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

// First generate an RSA private key.
// (It is also possible to create CSRs based on ECDSA private keys..)
let rsa = chilkat::Rsa::new();

// Generate a random 2048-bit RSA key.
let priv_key = chilkat::PrivateKey::new();
if rsa.gen_key(2048, &priv_key).is_err() {
    println!("{}", rsa.last_error_text());
    return;
}

// Create the CSR object and set properties.
let csr = chilkat::Csr::new();

// Specify the Common Name. 
csr.set_common_name("mysubdomain.mydomain.com");

// Country Name (2 letter code)
csr.set_country("GB");

// State or Province Name (full name)
csr.set_state("Yorks");

// Locality Name (eg, city)
csr.set_locality("York");

// Organization Name (eg, company)
csr.set_company("Internet Widgits Pty Ltd");

// Organizational Unit Name (eg, secion/division)
csr.set_company_division("IT");

// Email address
csr.set_email_address("support@mydomain.com");

// Add Subject Alternative Names
// (The AddSan method is added in Chilkat v9.5.0.84)
// Call AddSan for each alternative name.
let _ = csr.add_san("dnsName", "mydomain.com").is_ok();
let _ = csr.add_san("dnsName", "mysubdomain.mydomain.com").is_ok();
let _ = csr.add_san("ipAddress", "192.168.0.123").is_ok();

// Create the CSR using the private key.
let Ok(pem_str) = csr.gen_csr_pem(&priv_key) else {
    println!("{}", csr.last_error_text());
    return;
};

// Save the private key and CSR to a files.
let _ = priv_key.save_pkcs8_encrypted_pem_file("password", "qa_output/privKey1.pem");

let fac = chilkat::FileAccess::new();
let _ = fac.write_entire_text_file("qa_output/csr1.pem", &pem_str, "utf-8", false);

// Show the CSR.
println!("{}", pem_str);

// Sample output:

// 	-----BEGIN CERTIFICATE REQUEST-----
// 	MIIC6jCCAdICAQAwgaQxITAfBgNVBAMMGG15c3ViZG9tYWluLm15ZG9tYWluLmNv
// 	bTELMAkGA1UEBhMCR0IxDjAMBgNVBAgMBVlvcmtzMQ0wCwYDVQQHDARZb3JrMSEw
// 	HwYDVQQKDBhJbnRlcm5ldCBXaWRnaXRzIFB0eSBMdGQxCzAJBgNVBAsMAklUMSMw
// 	IQYJKoZIhvcNAQkBFhRzdXBwb3J0QG15ZG9tYWluLmNvbTCCASIwDQYJKoZIhvcN
// 	AQEBBQADggEPADCCAQoCggEBALnQ0un/wF8whk+gPuiAlf3qvx14jgAOV6Erm6EB
// 	H7WACPCpnKcm/8KP+7uoPiwRQaENhMeCgf45vcivl2p6aAn/spLXyEkXyw2d8wFb
// 	YYAGRkiz4Xf7ASJiKuwcOtORz+sSDzgtdfokHfXU1cYeFE2yQhSdLUY5fMn425+g
// 	KoEEsRSjSDe6AKru4+4iGNrLKd8pB9IA5/jOE139IkWlB9r5fEPD5bUTsgqXk9eb
// 	68O0gc712V2eZK07N24lDmFC4bIMTD4csDWocR5hFHXj7NX7c8sOBDcpEb9mPIk4
// 	elxubnhkfnjhOi4J3lDHcT/0ALnbLhf9LnaiKqs+5VcVZvECAwEAAaAAMA0GCSqG
// 	SIb3DQEBBQUAA4IBAQC0AETLIcP3foh5nbu2hVFS8uCUNZ5hEIR1eXmYZmZoBQq2
// 	26ZAoT4CZwixlggC+n7WvAXJ5Pzxpl4wLV4loTiQzaKPX1w0ERo5ZRwLy0n56oG2
// 	6QG+WTViT1C8rlgtVwkCFNOXr0kSSRs8FdaPllqKxK1hxYSL7zwNpumsk39F2cDt
// 	vhcekvH0V3BuGrQFm3dKN/0azW6GOod9+Vq4VzSyOe3kp15oxLBsZOFOu/REujcw
// 	Tzu2jt1asQKUm60CZ9wNHpYepR0Ww40uP1slbehEaFDa6V8b60/tlHHmBbJ4/fy5
// 	hJnYCvjzFz4O9VtT+JtP9ldRHWV3KpZ8ne3AjD+F
// 	-----END CERTIFICATE REQUEST-----