(Delphi DLL) Create Enveloping XML Signature with Multiple References

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

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, Http, BinData, PrivateKey, XmlDSigGen, StringBuilder;

...

procedure TForm1.Button1Click(Sender: TObject);
var
jpgData: HCkBinData;
http: HCkHttp;
success: Boolean;
sbJson: HCkStringBuilder;
sbPem: HCkStringBuilder;
rsaKey: HCkPrivateKey;
gen: HCkXmlDSigGen;
sbContent: HCkStringBuilder;
sbBase64: HCkStringBuilder;
sbXml: HCkStringBuilder;

begin
// 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 := CkBinData_Create();
http := CkHttp_Create();
success := CkHttp_QuickGetBd(http,'https://www.chilkatsoft.com/images/starfish.jpg',jpgData);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkHttp__lastErrorText(http));
    Exit;
  end;

// Get a small JSON document.
sbJson := CkStringBuilder_Create();
success := CkHttp_QuickGetSb(http,'https://www.chilkatsoft.com/exampleData/sample.json',sbJson);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkHttp__lastErrorText(http));
    Exit;
  end;

// Get an RSA private key for signing.
sbPem := CkStringBuilder_Create();
success := CkHttp_QuickGetSb(http,'https://www.chilkatdownload.com/example_data/rsaprivkey_secret.pem',sbPem);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkHttp__lastErrorText(http));
    Exit;
  end;

rsaKey := CkPrivateKey_Create();
success := CkPrivateKey_LoadEncryptedPem(rsaKey,CkStringBuilder__getAsString(sbPem),'secret');
if (success <> True) then
  begin
    Memo1.Lines.Add(CkPrivateKey__lastErrorText(rsaKey));
    Exit;
  end;

// OK.. ready to begin building the signature.
gen := CkXmlDSigGen_Create();

// Provide the RSA key to the XML Digital Signature generator
CkXmlDSigGen_SetPrivateKey(gen,rsaKey);

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

CkXmlDSigGen_AddEnvelopedRef(gen,'bbb',sbJson,'sha256','C14N','');

sbBase64 := CkStringBuilder_Create();
// Use "base64_mime" to encode the JPG data to base64 in multiple lines.
CkBinData_GetEncodedSb(jpgData,'base64_mime',sbBase64);
CkXmlDSigGen_AddEnvelopedRef(gen,'ccc',sbBase64,'sha256','C14N','');

// Generate the XML digital signature.
sbXml := CkStringBuilder_Create();
success := CkXmlDSigGen_CreateXmlDSigSb(gen,sbXml);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkXmlDSigGen__lastErrorText(gen));
    Exit;
  end;

// Examine the enveloped signature, where the data for each reference is contained within the XML Signature
Memo1.Lines.Add(CkStringBuilder__getAsString(sbXml));

// 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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// </ds:Object></ds:Signature>

// Here is the pretty-printed XML signature, which isn't actually valid anymore..

// <?xml version="1.0" encoding="utf-8" ?>
// <ds:Signature xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
//     <ds:SignedInfo>
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//         <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" />
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//         </ds:Reference>
//         <ds:Reference URI="#bbb">
//             <ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256" />
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//         </ds:Reference>
//         <ds:Reference URI="#ccc">
//             <ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256" />
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//         </ds:Reference>
//     </ds:SignedInfo>
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//     <ds:KeyInfo>
//         <ds:KeyValue>
//             <ds:RSAKeyValue>
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//                 <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">{
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//    "lime": "green",
//    "banana": "yellow",
//    "broccoli": "green",
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// 
// 

CkBinData_Dispose(jpgData);
CkHttp_Dispose(http);
CkStringBuilder_Dispose(sbJson);
CkStringBuilder_Dispose(sbPem);
CkPrivateKey_Dispose(rsaKey);
CkXmlDSigGen_Dispose(gen);
CkStringBuilder_Dispose(sbContent);
CkStringBuilder_Dispose(sbBase64);
CkStringBuilder_Dispose(sbXml);

end;