Rust Requires Chilkat v11.0.0+

Validate Certificate using OCSP Protocol

See more Certificates Examples

Demonstrates how to validate a certificate (check the revoked status) using the OCSP protocol. Rust

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

// This example will check the revoked status of a certificate loaded from a file.
let cert = chilkat::Cert::new();
if cert.load_from_file("qa_data/certs/google.crt").is_err() {
    println!("{}", cert.last_error_text());
    return;
}

// Get the cert's OCSP URL.
let ocsp_url = cert.ocsp_url();

// Build the JSON that will be the OCSP request.

// Possible hash algorithms are sha1, sha256, sha384, sha512.  
let hash_alg = "sha256".to_string();
let prng = chilkat::Prng::new();
let json = chilkat::JsonObject::new();
json.set_emit_compact(false);
// Read more about OCSP nonce lengths
let _ = json.update_string("extensions.ocspNonce", &prng.gen_random(16, "base64").unwrap_or_default());
json.set_i(0);
let _ = json.update_string("request[i].cert.hashAlg", &hash_alg);
let _ = json.update_string("request[i].cert.issuerNameHash", &cert.hash_of("IssuerDN", &hash_alg, "base64").unwrap_or_default());
let _ = json.update_string("request[i].cert.issuerKeyHash", &cert.hash_of("IssuerPublicKey", &hash_alg, "base64").unwrap_or_default());
let _ = json.update_string("request[i].cert.serialNumber", &cert.serial_number());

println!("{}", json.emit().unwrap_or_default());

// Our OCSP request looks something like this:
// {
//   "extensions": {
//     "ocspNonce": "qZDfbpO+nUxRzz6c/SPjE5QCAsPfpkQlRDxTnGl0gnxt7iXO"
//   },
//   "request": [
//     {
//       "cert": {
//         "hashAlg": "sha1",
//         "issuerNameHash": "9u2wY2IygZo19o11oJ0CShGqbK0=",
//         "issuerKeyHash": "d8K4UJpndnaxLcKG0IOgfqZ+uks=",
//         "serialNumber": "6175535D87BF94B6"
//       }
//     }
//   ]
// }

let ocsp_request = chilkat::BinData::new();
let http = chilkat::Http::new();

// Convert our JSON to a binary (ASN.1) OCSP request
if http.create_ocsp_request(&json, &ocsp_request).is_err() {
    println!("{}", http.last_error_text());
    return;
}

// Send the OCSP request to the OCSP server
let resp = chilkat::HttpResponse::new();
if http.http_bd("POST", &ocsp_url, &ocsp_request, "application/ocsp-request", &resp).is_err() {
    println!("{}", http.last_error_text());
    return;
}

// Get the binary (ASN.1) OCSP reply
let ocsp_reply = chilkat::BinData::new();
let _ = resp.get_body_bd(&ocsp_reply);

// Convert the binary reply to JSON.
// Also returns the overall OCSP response status.
let json_reply = chilkat::JsonObject::new();
let ocsp_status = http.parse_ocsp_reply(&ocsp_reply, &json_reply);

// The ocspStatus can have one of these values:
// -1:  The ARG1 does not contain a valid OCSP reply.
// 0:  Successful - Response has valid confirmations..
// 1: Malformed request - Illegal confirmation request.
// 2: Internal error - Internal error in issuer.
// 3: Try later -  Try again later.
// 4: Not used - This value is never returned.
// 5: Sig required - Must sign the request.
// 6: Unauthorized - Request unauthorized.

if ocsp_status < 0 {
    println!("Invalid OCSP reply.");
    return;
}

println!("Overall OCSP Response Status: {}", ocsp_status);

// Let's examine the OCSP response (in JSON).
json_reply.set_emit_compact(false);
println!("{}", json_reply.emit().unwrap_or_default());

// The JSON reply looks like this:
// (Use the online tool at https://tools.chilkat.io/jsonParse.cshtml
// to generate JSON parsing code.)

// {
//   "responseStatus": 0,
//   "responseTypeOid": "1.3.6.1.5.5.7.48.1.1",
//   "responseTypeName": "ocspBasic",
//   "response": {
//     "responderIdChoice": "KeyHash",
//     "responderKeyHash": "d8K4UJpndnaxLcKG0IOgfqZ+uks=",
//     "dateTime": "20180803193937Z",
//     "cert": [
//       {
//         "hashOid": "1.3.14.3.2.26",
//         "hashAlg": "SHA-1",
//         "issuerNameHash": "9u2wY2IygZo19o11oJ0CShGqbK0=",
//         "issuerKeyHash": "d8K4UJpndnaxLcKG0IOgfqZ+uks=",
//         "serialNumber": "6175535D87BF94B6",
//         "status": 0,
//         "thisUpdate": "20180803193937Z",
//         "nextUpdate": "20180810193937Z"
//       }
//     ]
//   }
// }
// 

// The certificate status:
let mut cert_status = -1;
if json_reply.has_member("response.cert[0].status") {
    cert_status = json_reply.int_of("response.cert[0].status");
}

// Possible certStatus values are:
// -1: No status returned.
// 0: Good
// 1: Revoked
// 2: Unknown.
println!("Certificate Status: {}", cert_status);