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Pascal (Lazarus/Delphi)

Create Enveloping XML Signature with Multiple References

See more XML Digital Signatures Examples

Demonstrates how to create an enveloping XML digital signature containing multiple Object references.

Chilkat Pascal (Lazarus/Delphi) Downloads

Pascal (Lazarus/Delphi)
program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.Http,
  Chilkat.BinData,
  Chilkat.PrivateKey,
  Chilkat.XmlDSigGen,
  Chilkat.StringBuilder;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  success: Boolean;
  jpgData: TBinData;
  http: THttp;
  sbJson: TStringBuilder;
  sbPem: TStringBuilder;
  rsaKey: TPrivateKey;
  gen: TXmlDSigGen;
  sbContent: TStringBuilder;
  sbBase64: TStringBuilder;
  sbXml: TStringBuilder;

begin
  success := False;

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

  //  This example creates an XML signature that contains three Objects:
  //  
  //  1. A base64 encoded JPG image.
  //  2. Some plain text.
  //  3. Some JSON.
  //  

  //  Get a small JPG image.
  jpgData := TBinData.Create;
  http := THttp.Create;
  success := http.QuickGetBd('https://www.chilkatsoft.com/images/starfish.jpg',jpgData);
  if (success <> True) then
    begin
      WriteLn(http.LastErrorText);
      Exit;
    end;

  //  Get a small JSON document.
  sbJson := TStringBuilder.Create;
  success := http.QuickGetSb('https://www.chilkatsoft.com/exampleData/sample.json',sbJson);
  if (success <> True) then
    begin
      WriteLn(http.LastErrorText);
      Exit;
    end;

  //  Get an RSA private key for signing.
  sbPem := TStringBuilder.Create;
  success := http.QuickGetSb('https://www.chilkatdownload.com/example_data/rsaprivkey_secret.pem',sbPem);
  if (success <> True) then
    begin
      WriteLn(http.LastErrorText);
      Exit;
    end;

  rsaKey := TPrivateKey.Create;
  success := rsaKey.LoadEncryptedPem(sbPem.GetAsString(),'secret');
  if (success <> True) then
    begin
      WriteLn(rsaKey.LastErrorText);
      Exit;
    end;

  //  OK.. ready to begin building the signature.
  gen := TXmlDSigGen.Create;

  //  Provide the RSA key to the XML Digital Signature generator
  gen.SetPrivateKey(rsaKey);

  //  Add enveloped references to the content to be signed.
  sbContent := TStringBuilder.Create;
  sbContent.Append('The quick brown fox jumped over the lazy dog.');
  gen.AddEnvelopedRef('aaa',sbContent,'sha256','C14N','');

  gen.AddEnvelopedRef('bbb',sbJson,'sha256','C14N','');

  sbBase64 := TStringBuilder.Create;
  //  Use "base64_mime" to encode the JPG data to base64 in multiple lines.
  jpgData.GetEncodedSb('base64_mime',sbBase64);
  gen.AddEnvelopedRef('ccc',sbBase64,'sha256','C14N','');

  //  Generate the XML digital signature.
  sbXml := TStringBuilder.Create;
  success := gen.CreateXmlDSigSb(sbXml);
  if (success <> True) then
    begin
      WriteLn(gen.LastErrorText);
      Exit;
    end;

  //  Examine the enveloped signature, where the data for each reference is contained within the XML Signature
  WriteLn(sbXml.GetAsString());

  //  The exact XML signature looks like this:
  //  (A pretty-printed XML signature is shown further below, but beware that the introduced whitespace breaks the signature.)

  //  <ds:Signature xmlns:ds="http://www.w3.org/2000/09/xmldsig#"><ds:SignedInfo><ds:CanonicalizationMethod Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/><ds:SignatureMethod Algorithm="http://www.w3.org/2001/04/xmldsig-more#rsa-sha256"/><ds:Reference URI="#aaa"><ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/><ds:DigestValue>f0KK1a9yt2XMxCcr5Keziiv4BpAev/rRt/CGSJwS9i0=</ds:DigestValue></ds:Reference><ds:Reference URI="#bbb"><ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/><ds:DigestValue>buBASaqBjJXez8r/hFz4ZIIf+1mgf63AoI8MihViJtU=</ds:DigestValue></ds:Reference><ds:Reference URI="#ccc"><ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/><ds:DigestValue>+9PN/3Bz7xOuqi/wIBlGHEwPx+YUoILMsr2Iu0i1cCU=</ds:DigestValue></ds:Reference></ds:SignedInfo><ds:SignatureValue>fI9l6/CKuwa7J2cczBzsKTOKec6cOVX/ehY2RcDZreGJlSo8bgv++nliFTwPyiZ8GT1Q2rDrA8biOt/ysZWnfim6AR79ld9CtLuKdqNsS/aSjwroDG/eWM0447zWoDSgAIsjXUAsF5xLschFW7+pGoPl5S1fVT/PUBkySlBi0I/U8P2UdiY8GoAL2rkHxTxDHaWh1GpBY28o9MSCuTgTiLVHF6WbmdHggqMc70OSTRh5vCMzZRTaAkTH6SWYt2WczKwmVea7hkM3BhpbA3EnpEIxK7TFl2GkFGXxAyXAxe2SVmXngt025LOFtU72fE+eChbqr5tejWl81z1g2F7ZnQ==</ds:SignatureValue><ds:KeyInfo><ds:KeyValue><ds:RSAKeyValue><ds:Modulus>sXeRhM55P13FbpNcXAMR3olbw2Wa6keZIHu5YTZYUBTlYWId+pNiwUz3zFIEo+0IfYR0H27ybIycQO+1IIzJofUFNMAL3tZps2OKPlsjuCPls6kXpXhv/gvhux8LrCtp4PcKWqJ6QVOZKChc7WAx40qFWzHi57ueqRTv3x0kESqGg/VjsqyTEvb55psJO2RsfhLT7+YVh3hImRM3RDaJdkTkPuOxeFyT6N7VXD09329sLuS3QkUbE9zEKDnz9X3d8dEQdJhSI9ba5fxl8R7fu8pB67ElfzFml96X1jLFtzy1pzOT5Fc4ROcaqlYckVzdBq9sxezm6MYmDBjNAcibRw==</ds:Modulus><ds:Exponent>AQAB</ds:Exponent></ds:RSAKeyValue></ds:KeyValue></ds:KeyInfo><ds:Object Id="aaa">The quick brown fox jumped over the lazy dog.</ds:Object><ds:Object Id="bbb">{
  //     "apple": "red",
  //     "lime": "green",
  //     "banana": "yellow",
  //     "broccoli": "green",
  //     "strawberry": "red"
  //  }
  //  </ds:Object><ds:Object Id="ccc">/9j/4AAQSkZJRgABAgEASABIAAD/7Q18UGhvdG9zaG9wIDMuMAA4QklNA+0AAAAAABAASAAAAAEA
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  //  n/TxUpCcpBEE6t9OtBso5jDrbWoxoBHShdcraKv7aZ3N4BkxvTPft8VN6dLTrDEGT+pjDqOLz1La
  //  9Z9hrGCV013xuj32Ph81WubCwDRI0u3wODC7W8FC6CrtIgEDQeb3qCqIAHTbK5gKKAMczJsUkag3
  //  WKt1cv0gbDkAZMzg9v5ZXuuv9slC4asdAokkezh/HRdse3UAnWmTJIOIm07GOumzeoMTvqbQqqdZ
  //  3p5jO2Ld4Fx46xZCAhVgCp0MHTZanepWHWOmULEY8IEkam5uGhhV2TI+nqJUl8ZU22RI3H4r1oW3
  //  ZspOpYkgeZot73coZMouynUk1AGlH1WAQTx6ffWS3Eucxaqm7dYm1SIbxdykXIvLeTxgghjs5hea
  //  xOPCJ6bsuO9Wa7YT1W+7u+apZWUE65H1eNkXUFVRd1n5WxuJDCKZwrQzAqykgrJjmLHEyrQyJ8R8
  //  5tW83ZNt7uMQZrMlqb7U2ObgDIP069PeANboA6JKj4iiVNOro3NZiOdLXmfyr7iqL+pTaQoAEDQf
  //  f5fnr2W1+0aGrcQ+vo//2Q==</ds:Object>
  //  </ds:Signature>
  //  
  //  


  jpgData.Free;
  http.Free;
  sbJson.Free;
  sbPem.Free;
  rsaKey.Free;
  gen.Free;
  sbContent.Free;
  sbBase64.Free;
  sbXml.Free;

end;

// ---------------------------------------------------------------------------

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.