IPWorks S/MIME 2020 C++ Builder Edition

Questions / Feedback?

CertExtensionValue Property

The raw value of this certificate extension.

Syntax

__property String CertExtensionValue[int CertExtensionIndex] = { read=FCertExtensionValue };
__property DynamicArray<Byte> CertExtensionValueB[int CertExtensionIndex] = { read=FCertExtensionValueB };

Default Value

""

Remarks

The raw value of this certificate extension. This value is encoded according to the extension's ASN.1 specification and should contain everything following the OID. Below is an example for clarity.

The example will

  • Add a sequence of basicConstraints indicating the holder of this certificate may not act as a CA.
  • Add a sequence of cRLDistributionPoints for where to get CRLs.

Certmgr mgr = new Certmgr();
mgr.Cert = new Certificate(CertStoreTypes.cstPFXFile, @"C:\signingcert.pfx", "password", "*");
mgr.CertExtensions.Clear();
mgr.Config("CertUsageFlags=0xA0"); //Key Encryption and Digital Signatures
mgr.Config("CertExtendedKeyUsage=1.3.6.1.5.5.7.3.1,1.3.6.1.5.5.7.3.2"); //Server and Client authentication (respectively)
mgr.Config("CertValidityTime=10000");

Netcode nc = new Netcode();
nc.Format = NetcodeFormats.fmtHex;

// Set basicConstraints to be an end-entity.
// Below is the hex-encoded value broken down.
// 30     // Tag = sequence
// 03     // Length
//   01   // Tag = boolean
//   01   // Length
//     00 // False (not a CA)

// Convert hex string to byte[]
nc.EncodedData = "3003010100";
nc.Decode();

string oid = "2.5.29.19"; // basicConstraints
byte[] value = nc.DecodedDataB;
bool critical = false;
CertExtension basicConstraints = new CertExtension(oid, value, critical);
mgr.CertExtensions.Add(basicConstraints);

// Add one point: http://www.nsoftware.com/dummy/MyCA.crl
// Below is the hex-encoded value broken down.
// 30                    // Tag = sequence
// 2F                    // Length
//   30                  // Tag = DistributionPoint
//   2D                  // Length
//     A0                // Tag = DistributionPointName
//     2B                // Length
//       A0              // Tag = GeneralNames
//       29              // Length
//         86            // Tag = GeneralName
//         27            // Length
//           687474703A2F2F7777772E6E736F6674776172652E636F6D2F64756D6D792F4D7943412E63726C // URL

// Convert hex string to byte[]
nc.EncodedData = "302F302DA02BA0298627687474703A2F2F7777772E6E736F6674776172652E636F6D2F64756D6D792F4D7943412E63726C";
nc.Decode();

oid = "2.5.29.31"; // cRLDistributionPoints
value = nc.DecodedDataB;
critical = false;
CertExtension crlDistributionPoints = new CertExtension(oid, value, critical);
mgr.CertExtensions.Add(crlDistributionPoints);

mgr.IssueCertificate("CN=www.petsbymatilda.com", 123);
Console.WriteLine(mgr.Cert.Encoded);

The CertExtensionIndex parameter specifies the index of the item in the array. The size of the array is controlled by the CertExtensionCount property.

This property is read-only and not available at design time.

Data Type

Byte Array

Copyright (c) 2022 /n software inc. - All rights reserved.
IPWorks S/MIME 2020 C++ Builder Edition - Version 20.0 [Build 8154]