Rust

Get Certificate Authority Information Access

See more Certificates Examples

Demonstrates how to get a certificate's Authority Information Access extension data (if it exists).

Note: This example requires Chilkat v9.5.0.76 or greater.

Rust

let cert = chilkat::Cert::new();

if cert.load_from_file("qa_data/certs/test_haswdt.cer").is_err() {
    println!("{}", cert.last_error_text());
    return;
}

// Get the Authority Information Access extension, which is at OID 1.3.6.1.5.5.7.1.1
let Ok(extension_xml_str) = cert.get_extension_as_xml("1.3.6.1.5.5.7.1.1") else {
    println!("Certificate does not have the AuthInfoAccess extension.");
    return;
};

let xml = chilkat::Xml::new();
let _ = xml.load_xml(&extension_xml_str);

// See what we have..
println!("{}", xml.get_xml().unwrap_or_default());

// We should get XML like this:

// <?xml version="1.0" encoding="utf-8" ?>
// <sequence>
//     <sequence>
//         <oid>1.3.6.1.5.5.7.48.2</oid>
//         <contextSpecific tag="6" constructed="0">aHR0cDovL2NydC5jb21vZG9jYS5jb20vQ09NT0RPUlNBQ2xpZW50QXV0aGVudGljYXRpb25hbmRTZWN1
// cmVFbWFpbENBLmNydA==</contextSpecific>
//     </sequence>
//     <sequence>
//         <oid>1.3.6.1.5.5.7.48.1</oid>
//         <contextSpecific tag="6" constructed="0">aHR0cDovL29jc3AuY29tb2RvY2EuY29t</contextSpecific>
//     </sequence>
// </sequence>

// Typically, a certificate AIA(Authority Information access) contains 2 parts:
// 
//     On-line Certificate Status Protocol (1.3.6.1.5.5.7.48.1)
//     Certification Authority Issuer (1.3.6.1.5.5.7.48.2)
// 
// The base64 content for each OID (in this case) is just a string.  
// The data can be accessed and decoded like this:

let sb_ocsp = chilkat::StringBuilder::new();
if xml.get_child_content_sb("/C/oid,1.3.6.1.5.5.7.48.1|++", &sb_ocsp).is_ok() {
    let _ = sb_ocsp.decode("base64", "utf-8");
    println!("1.3.6.1.5.5.7.48.1:  {}", sb_ocsp.get_as_string().unwrap_or_default());
}

let sb_issuer = chilkat::StringBuilder::new();
if xml.get_child_content_sb("/C/oid,1.3.6.1.5.5.7.48.2|++", &sb_issuer).is_ok() {
    let _ = sb_issuer.decode("base64", "utf-8");
    println!("1.3.6.1.5.5.7.48.2:  {}", sb_issuer.get_as_string().unwrap_or_default());
}

// The output looks like this:

// 1.3.6.1.5.5.7.48.1:  http://ocsp.comodoca.com
// 1.3.6.1.5.5.7.48.2:  http://crt.comodoca.com/COMODORSAClientAuthenticationandSecureEmailCA.crt

// -------------------------------------------------------------------------------
// Note: The Chilkat path passed to GetChildContentSb is composed of two commands:
// The first command is "/C/oid,1.3.6.1.5.5.7.48.1".   It says "traverse the XML tree from the caller
// node and stop at the 1st node having tag = "oid" and content = "1.3.6.1.5.5.7.48.1".
// The "|" char separates the 1st command from the 2nd.
// The 2nd command is "++" and says "move to the next sibling".