Delphi ActiveX

DSA Generate Key

See more DSA Examples

Generates a DSA public/private key pair and saves to PEM and DER file formats (both encrypted and non-encrypted).

An encrypted DSA PEM looks like this:

-----BEGIN DSA PRIVATE KEY-----
Proc-Type: 4,ENCRYPTED
DEK-Info: DES-EDE3-CBC,9DAFD5C4CD62A5D0

QwDdp66sB0qKXQli7FbVcKL/eo3wu7kGRlV2sI8XbkNa1RTLiwnwTWDB0dqyWRQ8
...
Bx0HVfxKiNgCbL6BQEnYD+GOmMcckuj9Uhgloe/YuXCIDJBGhjUt/li3hvR/PXeC

V2xxNl1XKBE88njqi+UXt4vjGVNLpvXM
-----END DSA PRIVATE KEY-----

Delphi ActiveX

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Integer;
dsa: TChilkatDsa;
pemStr: WideString;
xmlStr: WideString;
bPublicOnly: Integer;

begin
success := 0;

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

dsa := TChilkatDsa.Create(Self);

// Call GenKey to generate a new DSA key.
// The number of bits should be at least 1024 and a multiple
// of 64.   Typical values are either 1024 or 2048.
// DSA key generation is compute intensive and may take
// a short while to complete.
success := dsa.GenKey(2048);
if (success <> 1) then
  begin
    Memo1.Lines.Add(dsa.LastErrorText);
    Exit;
  end;

// Extract the private and public parts to PEM or DER format
// and save to files...

// First for the public key...
// The public key never needs to be encrypted.

// Save the public key in PEM format:
pemStr := dsa.ToPublicPem();
// This example will not check the return value of SaveText...
success := dsa.SaveText(pemStr,'dsa_pub.pem');

// Save the public key in DER format:
success := dsa.ToPublicDerFile('dsa_pub.der');

bPublicOnly := 1;
// Save to XML
xmlStr := dsa.ToXml(bPublicOnly);
success := dsa.SaveText(xmlStr,'dsa_pub.xml');

// ------------------------------------
// Now for the private key....
// ------------------------------------

// Unencrypted PEM:
pemStr := dsa.ToPem();
success := dsa.SaveText(pemStr,'dsa_priv.pem');

// Encrypted PEM:
pemStr := dsa.ToEncryptedPem('myPassword');
success := dsa.SaveText(pemStr,'dsa_privEncrypted.pem');

// DER:
success := dsa.ToDerFile('dsa_priv.der');

// XML:
bPublicOnly := 0;
xmlStr := dsa.ToXml(bPublicOnly);
success := dsa.SaveText(xmlStr,'dsa_priv.xml');

Memo1.Lines.Add('Finished!');
end;