Generate new DSA Key from OpenSSL Parameters File

Generates a new DSA key from an OpenSSL-created parameters file (DER and PEM formats supported). Examples of using OpenSSL to create parameter files are shown here:

openssl dsaparam -outform DER 1024 <  seedData.txt >dsaparam.der

openssl dsaparam 1024 < seedData.txt >dsaparam.pem

Download Chilkat DSA ActiveX

uses
    Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
    Dialogs, StdCtrls,
    CHILKATDSALib_TLB,
    OleCtrls;

...

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

begin


dsa := TChilkatDsa.Create(Self);

success := dsa.UnlockComponent('Anything for 30-day trial');
if (success <> 1) then
  begin
    ShowMessage(dsa.LastErrorText);
    Exit;
  end;

success := dsa.GenKeyFromParamsDerFile('dsaparam.der');
if (success <> 1) then
  begin
    ShowMessage(dsa.LastErrorText);
    Exit;
  end;

//  To generate a key from PEM, call GenKeyFromParamsPem
//  (for an in-memory PEM string) or GenKeyFromParamsFilePem
//  for a PEM file.

//  The public and private keys may now be exported to PEM, DER,
//  and XML formatted 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(pemStr,'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(pemStr,'dsa_priv.xml');

ShowMessage('Finished!');
end;