(Mono C#) Binary Certificate Extension Data

See more Certificates Examples

Demonstrates how to binary certificate extension data by OID.

The GetExtensionBd method is added in Chilkat v9.5.0.96.

Chilkat .NET Downloads Chilkat .NET Assemblies Chilkat for .NET Core Chilkat for Mono

Chilkat.Cert cert = new Chilkat.Cert();

bool success = cert.LoadFromFile("qa_data/certs/testCert.cer");
if (success == false) {
    Debug.WriteLine(cert.LastErrorText);
    return;
}

Chilkat.BinData bd = new Chilkat.BinData();

// The particular certificate in this test contains the following extensions

string oid = "1.2.250.1.71.1.2.5";
success = cert.GetExtensionBd(oid,bd);
if (success == true) {
    Debug.WriteLine(oid + ": " + bd.GetEncoded("hex_lower"));
}

oid = "1.2.250.1.71.1.2.2";
success = cert.GetExtensionBd(oid,bd);
if (success == true) {
    Debug.WriteLine(oid + ": " + bd.GetEncoded("hex_lower"));
}

oid = "1.2.250.1.71.1.2.3";
success = cert.GetExtensionBd(oid,bd);
if (success == true) {
    Debug.WriteLine(oid + ": " + bd.GetEncoded("hex_lower"));
}

oid = "1.2.250.1.71.1.2.7";
success = cert.GetExtensionBd(oid,bd);
if (success == true) {
    Debug.WriteLine(oid + ": " + bd.GetEncoded("hex_lower"));
}

oid = "1.2.250.1.71.4.2.5";
success = cert.GetExtensionBd(oid,bd);
if (success == true) {
    Debug.WriteLine(oid + ": " + bd.GetEncoded("hex_lower"));
}

// Sample output:
// 1.2.250.1.71.1.2.5: 040180
// 1.2.250.1.71.1.2.2: 020100
// 1.2.250.1.71.1.2.3: 1315383032353030303030312f32393030303539313432
// 1.2.250.1.71.1.2.7: 02010a
// 1.2.250.1.71.4.2.5: 30060c04534d3236

// The above binary values are actually ASN.1
// You can get the ASN.1 decoed by calling GetExtensionAsXml to get it in XML format,
// and then you extract the values from the XML.

oid = "1.2.250.1.71.1.2.5";
string strXml = cert.GetExtensionAsXml(oid);
if (cert.LastMethodSuccess == true) {
    Debug.WriteLine(oid + ": " + strXml);
}

oid = "1.2.250.1.71.1.2.2";
strXml = cert.GetExtensionAsXml(oid);
if (cert.LastMethodSuccess == true) {
    Debug.WriteLine(oid + ": " + strXml);
}

oid = "1.2.250.1.71.1.2.3";
strXml = cert.GetExtensionAsXml(oid);
if (cert.LastMethodSuccess == true) {
    Debug.WriteLine(oid + ": " + strXml);
}

oid = "1.2.250.1.71.1.2.7";
strXml = cert.GetExtensionAsXml(oid);
if (cert.LastMethodSuccess == true) {
    Debug.WriteLine(oid + ": " + strXml);
}

oid = "1.2.250.1.71.4.2.5";
strXml = cert.GetExtensionAsXml(oid);
if (cert.LastMethodSuccess == true) {
    Debug.WriteLine(oid + ": " + strXml);
}

// Sample output:
// 1.2.250.1.71.1.2.5: <octets>gA==</octets>
// 1.2.250.1.71.1.2.2: <int>00</int>
// 1.2.250.1.71.1.2.3: <printable>8025000001/2900059142</printable>
// 1.2.250.1.71.1.2.7: <int>0A</int>
// 1.2.250.1.71.4.2.5: <sequence><utf8>SM26</utf8></sequence>

// "gA==" is the base64 encoded byte values
// "0A" is hex for decimal 1