Delphi DLL

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 DLL

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

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Boolean;
dsa: HCkDsa;
pemStr: PWideChar;
xmlStr: PWideChar;
bPublicOnly: Boolean;

begin
success := False;

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

dsa := CkDsa_Create();

// 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 := CkDsa_GenKey(dsa,2048);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkDsa__lastErrorText(dsa));
    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 := CkDsa__toPublicPem(dsa);
// This example will not check the return value of SaveText...
success := CkDsa_SaveText(dsa,pemStr,'dsa_pub.pem');

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

bPublicOnly := True;
// Save to XML
xmlStr := CkDsa__toXml(dsa,bPublicOnly);
success := CkDsa_SaveText(dsa,xmlStr,'dsa_pub.xml');

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

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

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

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

// XML:
bPublicOnly := False;
xmlStr := CkDsa__toXml(dsa,bPublicOnly);
success := CkDsa_SaveText(dsa,xmlStr,'dsa_priv.xml');

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

CkDsa_Dispose(dsa);

end;