(Delphi DLL) Generate CSR from Pre-Existing Private Key

Demonstrates how to generate a Certificate Signing Request (CSR) from a pre-existing RSA private key.

Note: This example requires Chilkat v9.5.0.65 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, FileAccess, Csr, PrivateKey;

...

procedure TForm1.Button1Click(Sender: TObject);
var
privKey: HCkPrivateKey;
success: Boolean;
csr: HCkCsr;
pemStr: PWideChar;
fac: HCkFileAccess;

begin
// Note: Requires Chilkat v9.5.0.65 or greater.

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

privKey := CkPrivateKey_Create();

// Load the private key from a file.
// (Chilkat provides the ability to load private keys from many different
// formats and sources..)
success := CkPrivateKey_LoadEncryptedPemFile(privKey,'qa_data/rsa/privKey1.pem','password');
if (not success) then
  begin
    Memo1.Lines.Add(CkPrivateKey__lastErrorText(privKey));
    Exit;
  end;

// Create the CSR object and set properties.
csr := CkCsr_Create();

// Specify the Common Name.  This is the only required property.
// For SSL/TLS certificates, this would be the domain name. 
// For email certificates this would be the email address. 
CkCsr_putCommonName(csr,'mysubdomain.mydomain.com');

// Country Name (2 letter code)
CkCsr_putCountry(csr,'GB');

// State or Province Name (full name)
CkCsr_putState(csr,'Yorks');

// Locality Name (eg, city)
CkCsr_putLocality(csr,'York');

// Organization Name (eg, company)
CkCsr_putCompany(csr,'Internet Widgits Pty Ltd');

// Organizational Unit Name (eg, secion/division)
CkCsr_putCompanyDivision(csr,'IT');

// Email address
CkCsr_putEmailAddress(csr,'support@mydomain.com');

// Create the CSR using the private key.
pemStr := CkCsr__genCsrPem(csr,privKey);
if (CkCsr_getLastMethodSuccess(csr) <> True) then
  begin
    Memo1.Lines.Add(CkCsr__lastErrorText(csr));
    Exit;
  end;

// Save the CSR..
fac := CkFileAccess_Create();
CkFileAccess_WriteEntireTextFile(fac,'qa_output/csr1.pem',pemStr,'utf-8',False);

// Show the CSR.
Memo1.Lines.Add(pemStr);

// Sample output:
// The CSR PEM can be checked here:
// https://www.networking4all.com/en/support/tools/csr+check/
// Copy-and-paste the PEM into the online CSR Decoding / CSR Verification form

// 	-----BEGIN CERTIFICATE REQUEST-----
// 	MIIC6jCCAdICAQAwgaQxITAfBgNVBAMMGG15c3ViZG9tYWluLm15ZG9tYWluLmNv
// 	bTELMAkGA1UEBhMCR0IxDjAMBgNVBAgMBVlvcmtzMQ0wCwYDVQQHDARZb3JrMSEw
// 	HwYDVQQKDBhJbnRlcm5ldCBXaWRnaXRzIFB0eSBMdGQxCzAJBgNVBAsMAklUMSMw
// 	IQYJKoZIhvcNAQkBFhRzdXBwb3J0QG15ZG9tYWluLmNvbTCCASIwDQYJKoZIhvcN
// 	AQEBBQADggEPADCCAQoCggEBALnQ0un/wF8whk+gPuiAlf3qvx14jgAOV6Erm6EB
// 	H7WACPCpnKcm/8KP+7uoPiwRQaENhMeCgf45vcivl2p6aAn/spLXyEkXyw2d8wFb
// 	YYAGRkiz4Xf7ASJiKuwcOtORz+sSDzgtdfokHfXU1cYeFE2yQhSdLUY5fMn425+g
// 	KoEEsRSjSDe6AKru4+4iGNrLKd8pB9IA5/jOE139IkWlB9r5fEPD5bUTsgqXk9eb
// 	68O0gc712V2eZK07N24lDmFC4bIMTD4csDWocR5hFHXj7NX7c8sOBDcpEb9mPIk4
// 	elxubnhkfnjhOi4J3lDHcT/0ALnbLhf9LnaiKqs+5VcVZvECAwEAAaAAMA0GCSqG
// 	SIb3DQEBBQUAA4IBAQC0AETLIcP3foh5nbu2hVFS8uCUNZ5hEIR1eXmYZmZoBQq2
// 	26ZAoT4CZwixlggC+n7WvAXJ5Pzxpl4wLV4loTiQzaKPX1w0ERo5ZRwLy0n56oG2
// 	6QG+WTViT1C8rlgtVwkCFNOXr0kSSRs8FdaPllqKxK1hxYSL7zwNpumsk39F2cDt
// 	vhcekvH0V3BuGrQFm3dKN/0azW6GOod9+Vq4VzSyOe3kp15oxLBsZOFOu/REujcw
// 	Tzu2jt1asQKUm60CZ9wNHpYepR0Ww40uP1slbehEaFDa6V8b60/tlHHmBbJ4/fy5
// 	hJnYCvjzFz4O9VtT+JtP9ldRHWV3KpZ8ne3AjD+F
// 	-----END CERTIFICATE REQUEST-----

CkPrivateKey_Dispose(privKey);
CkCsr_Dispose(csr);
CkFileAccess_Dispose(fac);

end;