(Delphi DLL) Generate a CSR containing an Extension Request

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Demonstrates how to generate a CSR containing a 1.2.840.113549.1.9.14 extensionRequest.

Note: This example requires Chilkat v9.5.0.91 or greater.

Chilkat for Delphi Downloads Chilkat non-ActiveX DLL for Delphi Chilkat ActiveX DLL for Delphi * The examples here use the non-ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Xml, PrivateKey, Prng, Ecc, Csr;

...

procedure TForm1.Button1Click(Sender: TObject);
var
ecc: HCkEcc;
prng: HCkPrng;
privKey: HCkPrivateKey;
csr: HCkCsr;
xml: HCkXml;
csrPem: PWideChar;

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

// This example will generate a secp256r1 ECDSA key for the CSR.
ecc := CkEcc_Create();
prng := CkPrng_Create();

privKey := CkEcc_GenEccKey(ecc,'secp256r1',prng);
if (CkEcc_getLastMethodSuccess(ecc) = False) then
  begin
    Memo1.Lines.Add('Failed to generate a new ECDSA private key.');
    Exit;
  end;

csr := CkCsr_Create();

// Add common CSR fields:
CkCsr_putCommonName(csr,'mysubdomain.mydomain.com');
CkCsr_putCountry(csr,'GB');
CkCsr_putState(csr,'Yorks');
CkCsr_putLocality(csr,'York');
CkCsr_putCompany(csr,'Internet Widgits Pty Ltd');
CkCsr_putEmailAddress(csr,'support@mydomain.com');

// Add the following 1.2.840.113549.1.9.14 extensionRequest
// Note: The easiest way to know the content and format of the XML to be added is to examine
// a pre-existing CSR with the same desired extensionRequest.  You can use Chilkat to
// get the extensionRequest from an existing CSR. 

// 
// Here is a sample extension request:

// <?xml version="1.0" encoding="utf-8"?>
// <set>
//    <sequence>
//        <sequence>
//            <oid>1.3.6.1.4.1.311.20.2</oid>
//            <asnOctets>
//                <printable>ZATCA-Code-Signing</printable>
//            </asnOctets>
//        </sequence>
//        <sequence>
//            <oid>2.5.29.17</oid>
//            <asnOctets>
//                <sequence>
//                    <contextSpecific tag="4" constructed="1">
//                        <sequence>
//                            <set>
//                                <sequence>
//                                    <oid>2.5.4.4</oid>
//                                    <utf8>334623324234325</utf8>
//                                </sequence>
//                            </set>
//                            <set>
//                                <sequence>
//                                    <oid>0.9.2342.19200300.100.1.1</oid>
//                                    <utf8>310122393500003</utf8>
//                                </sequence>
//                            </set>
//                            <set>
//                                <sequence>
//                                    <oid>2.5.4.12</oid>
//                                    <utf8>0000</utf8>
//                                </sequence>
//                            </set>
//                            <set>
//                                <sequence>
//                                    <oid>2.5.4.26</oid>
//                                    <utf8>Sample E</utf8>
//                                </sequence>
//                            </set>
//                            <set>
//                                <sequence>
//                                    <oid>2.5.4.15</oid>
//                                    <utf8>Sample Business</utf8>
//                                </sequence>
//                            </set>
//                        </sequence>
//                    </contextSpecific>
//                </sequence>
//            </asnOctets>
//        </sequence>
//    </sequence>
// </set>

// Use this online tool to generate code from sample XML: 
// Generate Code to Create XML

// Here's the code to generate the above extension request.

xml := CkXml_Create();
CkXml_putTag(xml,'set');
CkXml_UpdateChildContent(xml,'sequence|sequence|oid','1.3.6.1.4.1.311.20.2');
CkXml_UpdateChildContent(xml,'sequence|sequence|asnOctets|printable','ZATCA-Code-Signing');
CkXml_UpdateChildContent(xml,'sequence|sequence[1]|oid','2.5.29.17');
CkXml_UpdateAttrAt(xml,'sequence|sequence[1]|asnOctets|sequence|contextSpecific',True,'tag','4');
CkXml_UpdateAttrAt(xml,'sequence|sequence[1]|asnOctets|sequence|contextSpecific',True,'constructed','1');
CkXml_UpdateChildContent(xml,'sequence|sequence[1]|asnOctets|sequence|contextSpecific|sequence|set|sequence|oid','2.5.4.4');
CkXml_UpdateChildContent(xml,'sequence|sequence[1]|asnOctets|sequence|contextSpecific|sequence|set|sequence|utf8','334623324234325');
CkXml_UpdateChildContent(xml,'sequence|sequence[1]|asnOctets|sequence|contextSpecific|sequence|set[1]|sequence|oid','0.9.2342.19200300.100.1.1');
CkXml_UpdateChildContent(xml,'sequence|sequence[1]|asnOctets|sequence|contextSpecific|sequence|set[1]|sequence|utf8','310122393500003');
CkXml_UpdateChildContent(xml,'sequence|sequence[1]|asnOctets|sequence|contextSpecific|sequence|set[2]|sequence|oid','2.5.4.12');
CkXml_UpdateChildContent(xml,'sequence|sequence[1]|asnOctets|sequence|contextSpecific|sequence|set[2]|sequence|utf8','0000');
CkXml_UpdateChildContent(xml,'sequence|sequence[1]|asnOctets|sequence|contextSpecific|sequence|set[3]|sequence|oid','2.5.4.26');
CkXml_UpdateChildContent(xml,'sequence|sequence[1]|asnOctets|sequence|contextSpecific|sequence|set[3]|sequence|utf8','Sample E');
CkXml_UpdateChildContent(xml,'sequence|sequence[1]|asnOctets|sequence|contextSpecific|sequence|set[4]|sequence|oid','2.5.4.15');
CkXml_UpdateChildContent(xml,'sequence|sequence[1]|asnOctets|sequence|contextSpecific|sequence|set[4]|sequence|utf8','Sample Business');

// Add the extension request to the CSR
CkCsr_SetExtensionRequest(csr,xml);

// Generate the CSR with the extension request
csrPem := CkCsr__genCsrPem(csr,privKey);
if (CkCsr_getLastMethodSuccess(csr) = False) then
  begin
    Memo1.Lines.Add(CkCsr__lastErrorText(csr));
    CkPrivateKey_Dispose(privKey);
    Exit;
  end;

Memo1.Lines.Add(csrPem);

CkPrivateKey_Dispose(privKey);

// Sample PEM output:

// -----BEGIN CERTIFICATE REQUEST-----
// MIICEjCCAbkCAQAwgZcxITAfBgNVBAMMGG15c3ViZG9tYWluLm15ZG9tYWluLmNv
// bTELMAkGA1UEBhMCR0IxDjAMBgNVBAgMBVlvcmtzMQ0wCwYDVQQHDARZb3JrMSEw
// HwYDVQQKDBhJbnRlcm5ldCBXaWRnaXRzIFB0eSBMdGQxIzAhBgkqhkiG9w0BCQEW
// FHN1cHBvcnRAbXlkb21haW4uY29tMFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAE
// g8EVNSV0ttlM9kG2E+J3ZB9WEDYVf2QA/8idrPRUafia1CHjd1kslwZA8eP2bAcf
// 2O493QAENqtW6DTHJbRz8KCBvjCBuwYJKoZIhvcNAQkOMYGtMIGqMCEGCSsGAQQB
// gjcUAgQUExJaQVRDQS1Db2RlLVNpZ25pbmcwgYQGA1UdEQR9MHukeTB3MRgwFgYD
// VQQEDA8zMzQ2MjMzMjQyMzQzMjUxHzAdBgoJkiaJk/IsZAEBDA8zMTAxMjIzOTM1
// MDAwMDMxDTALBgNVBAwMBDAwMDAxETAPBgNVBBoMCFNhbXBsZSBFMRgwFgYDVQQP
// DA9TYW1wbGUgQnVzaW5lc3MwCgYIKoZIzj0EAwIDRwAwRAIgF7D30eSBklfo+oel
// 1B0z64eJDB9MB3rCoiFZlj+mz0YCIHYI87eyqdtw2LOcAoBRhyxlBT6i28+Z/8t9
// bYsMIYvp
// -----END CERTIFICATE REQUEST-----

CkEcc_Dispose(ecc);
CkPrng_Dispose(prng);
CkCsr_Dispose(csr);
CkXml_Dispose(xml);

end;