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(Delphi ActiveX) Export Digital Certificate's Public KeyThe ExportPublicKey method can be called to get a certificate's public key. It can then be saved to any of a number of formats: (1) OpenSSL DER, (2) OpenSSL PEM, (3) RSA DER, (4) XML. Note: This example requires Chilkat v11.0.0 or greater.
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; cert: TChilkatCert; pubkey: TPublicKey; begin success := 0; cert := TChilkatCert.Create(Self); // LoadFromFile will load virtually any certificate format file. // It will auto-recognize the format and load appropiately. success := cert.LoadFromFile('/Users/chilkat/testData/cer/chilkat.cer'); if (success = 0) then begin Memo1.Lines.Add(cert.LastErrorText); Exit; end; // Get the public key: pubkey := TPublicKey.Create(Self); cert.GetPublicKey(pubkey.ControlInterface); // Save to various formats: success := pubkey.SaveDerFile(0,'/Users/chilkat/testData/pubkeys/chilkat_pkcs8.der'); if (success <> 1) then begin Memo1.Lines.Add(pubkey.LastErrorText); Exit; end; success := pubkey.SavePemFile(0,'/Users/chilkat/testData/pubkeys/chilkat.pem'); if (success <> 1) then begin Memo1.Lines.Add(pubkey.LastErrorText); Exit; end; success := pubkey.SaveDerFile(1,'/Users/chilkat/testData/pubkeys/chilkat_pkcs1.der'); if (success <> 1) then begin Memo1.Lines.Add(pubkey.LastErrorText); Exit; end; success := pubkey.SaveXmlFile('/Users/chilkat/testData/pubkeys/chilkat.xml'); if (success <> 1) then begin Memo1.Lines.Add(pubkey.LastErrorText); Exit; end; Memo1.Lines.Add('Public key exported to all file formats.'); end; |
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