Chilkat Examples

ChilkatHOMEAndroid™Classic ASPCC++C#Mono C#.NET Core C#C# UWP/WinRTDataFlexDelphi ActiveXDelphi DLLVisual FoxProJavaLianjaMFCObjective-CPerlPHP ActiveXPHP ExtensionPowerBuilderPowerShellPureBasicCkPythonChilkat2-PythonRubySQL ServerSwift 2Swift 3/4TclUnicode CUnicode C++Visual Basic 6.0VB.NETVB.NET UWP/WinRTVBScriptXojo PluginNode.jsExcelGo

C# UWP/WinRT Examples

Web API Categories

ASN.1
Amazon Glacier
Amazon S3
Amazon S3 (new)
Amazon SES
Amazon SNS
Amazon SQS
Azure Cloud Storage
Azure Service Bus
Base64
Bounced Email
Box
CSR
CSV
Certificates
Compression
DKIM / DomainKey
DSA
Diffie-Hellman
Digital Signatures
Dropbox
Dynamics CRM
ECC
Email Object
Encryption
FTP
FileAccess
Firebase
GMail REST API
Geolocation
Google APIs
Google Calendar
Google Cloud Storage
Google Drive
Google Photos
Google Sheets
Google Tasks
Gzip
HTML-to-XML/Text

HTTP
HTTP Misc
IMAP
JSON
JSON Web Encryption (JWE)
JSON Web Signatures (JWS)
JSON Web Token (JWT)
Java KeyStore (JKS)
MHT / HTML Email
MIME
Microsoft Graph
NTLM
OAuth1
OAuth2
OneDrive
OpenSSL
Outlook
PEM
PFX/P12
POP3
PRNG
REST
REST Misc
RSA Encryption
SCP
SFTP
SMTP
SSH
SSH Key
SSH Tunnel
SharePoint
Socket/SSL/TLS
Spider
Stream
Tar Archive
Upload
WebSocket
XAdES
XML
XML Digital Signatures
XMP
Zip
curl

 

 

 

(C# UWP/WinRT) Validate Certificate using OCSP Protocol

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

Note: This example requires Chilkat v9.5.0.75 or greater

Chilkat Universal Windows Platform (UWP) / WinRT Downloads

Chilkat for the Universal Windows Platform (UWP)

//  Note: Requires Chilkat v9.5.0.75 or greater.

//  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.
Chilkat.Cert cert = new Chilkat.Cert();
bool success = cert.LoadFromFile("qa_data/certs/google.crt");
if (success != true) {
    Debug.WriteLine(cert.LastErrorText);
    return;
}

//  Get the cert's OCSP URL.
string ocspUrl = cert.OcspUrl;

//  Build the JSON that will be the OCSP request.
Chilkat.Prng prng = new Chilkat.Prng();
Chilkat.JsonObject json = new Chilkat.JsonObject();
json.EmitCompact = false;
json.UpdateString("extensions.ocspNonce",prng.GenRandom(36,"base64"));
json.I = 0;
json.UpdateString("request[i].cert.hashAlg","sha1");
json.UpdateString("request[i].cert.issuerNameHash",cert.HashOf("IssuerDN","sha1","base64"));
json.UpdateString("request[i].cert.issuerKeyHash",cert.HashOf("IssuerPublicKey","sha1","base64"));
json.UpdateString("request[i].cert.serialNumber",cert.SerialNumber);

Debug.WriteLine(json.Emit());

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

Chilkat.BinData ocspRequest = new Chilkat.BinData();
Chilkat.Http http = new Chilkat.Http();

//  Convert our JSON to a binary (ASN.1) OCSP request
http.CreateOcspRequest(json,ocspRequest);

//  Send the OCSP request to the OCSP server
Chilkat.HttpResponse resp = await http.PBinaryBdAsync("POST",ocspUrl,ocspRequest,"application/ocsp-request",false,false);
if (http.LastMethodSuccess != true) {
    Debug.WriteLine(http.LastErrorText);
    return;
}

//  Get the binary (ASN.1) OCSP reply
Chilkat.BinData ocspReply = new Chilkat.BinData();
resp.GetBodyBd(ocspReply);

//  Convert the binary reply to JSON.
//  Also returns the overall OCSP response status.
Chilkat.JsonObject jsonReply = new Chilkat.JsonObject();
int ocspStatus = http.ParseOcspReply(ocspReply,jsonReply);

//  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 (ocspStatus < 0) {
    Debug.WriteLine("Invalid OCSP reply.");
    return;
}

Debug.WriteLine("Overall OCSP Response Status: " + Convert.ToString(ocspStatus));

//  Let's examine the OCSP response (in JSON).
jsonReply.EmitCompact = false;
Debug.WriteLine(jsonReply.Emit());

//  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:
int certStatus = json.IntOf("response.cert[0].status");

//  Possible certStatus values are:
//  0: Good
//  1: Revoked
//  2: Unknown.
Debug.WriteLine("Certificate Status: " + Convert.ToString(certStatus));

 

© 2000-2019 Chilkat Software, Inc. All Rights Reserved.