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.

C#

bool success = false;

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

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