(Delphi DLL) Convert ASN.1 to/from Binary DER, XML, and Base64

Demonstrates how to convert ASN.1 from and to any of the following formats: binary DER, Base64, and XML.

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, Xml, Asn;

...

procedure TForm1.Button1Click(Sender: TObject);
var
asn: HCkAsn;
success: Boolean;
strXml: PWideChar;
xml: HCkXml;
strBase64: PWideChar;
asn2: HCkAsn;
asn3: HCkAsn;

begin
asn := CkAsn_Create();

//  Begin with loading ASN.1 from a binary DER/BER format file.
success := CkAsn_LoadBinaryFile(asn,'/Users/chilkat/testData/p7b/test.p7b');
if (success <> True) then
  begin
    Memo1.Lines.Add(CkAsn__lastErrorText(asn));
    Exit;
  end;

//  Convert ASN.1 to XML:
strXml := CkAsn__asnToXml(asn);
if (CkAsn_getLastMethodSuccess(asn) <> True) then
  begin
    Memo1.Lines.Add(CkAsn__lastErrorText(asn));
    Exit;
  end;

//  The XML returned by AsnToXml will be compact and not pretty-formatted.
//  Use Chilkat XML to format the XML better:
xml := CkXml_Create();
success := CkXml_LoadXml(xml,strXml);
//  Assuming success for this example..
//  This is formatted better for human viewing:
Memo1.Lines.Add(CkXml__getXml(xml));

//  Now get the ASN.1 in base64 format.  Any encoding supported
//  by Chilkat can be passed, such as "hex", "uu", "quoted-printable", "base32", "modbase64", etc.
strBase64 := CkAsn__getEncodedDer(asn,'base64');

//  Load the ASN.1 from XML:
asn2 := CkAsn_Create();
success := CkAsn_LoadAsnXml(asn2,CkXml__getXml(xml));
if (success <> True) then
  begin
    Memo1.Lines.Add(CkAsn__lastErrorText(asn2));
    Exit;
  end;

//  Load the ASN.1 from an encoded string, such as base64:
asn3 := CkAsn_Create();
success := CkAsn_LoadEncoded(asn3,strBase64,'base64');
if (success <> True) then
  begin
    Memo1.Lines.Add(CkAsn__lastErrorText(asn3));
    Exit;
  end;

CkAsn_Dispose(asn);
CkXml_Dispose(xml);
CkAsn_Dispose(asn2);
CkAsn_Dispose(asn3);

end;