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(Delphi ActiveX) Create XML Digital Signature using a DSA KeyDemonstrates how to create an XML digital signature using a DSA key. This example requires Chilkat v9.5.0.69 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 url: WideString; http: TChilkatHttp; sbXml: TChilkatStringBuilder; success: Integer; dsaKey: TPrivateKey; xmlSigGen: TChilkatXmlDSigGen; verifier: TChilkatXmlDSig; bVerified: Integer; begin // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. // The XML to be signed in this example contains the following: // <?xml version="1.0" encoding="UTF-8" standalone="no"?> // <Envelope> // <Header> // <Security> // </Security> // </Header> // <Body Id="abc"> // <z:FooBar xmlns:z="https://www.example-code.com"/> // </Body> // </Envelope> // The above XML is available at https://www.chilkatsoft.com/exampleData/xmlToSign.xml // Fetch the XML and then sign it.. url := 'https://www.chilkatsoft.com/exampleData/xmlToSign.xml'; http := TChilkatHttp.Create(Self); sbXml := TChilkatStringBuilder.Create(Self); success := http.QuickGetSb(url,sbXml.ControlInterface); if (success <> 1) then begin Memo1.Lines.Add(http.LastErrorText); Exit; end; // This example uses a DSA private key for signing. // There are many ways of getting an DSA private key using Chilkat. This example // will load it from an encrypted PEM file. // In case you would like to use it, I put the DSA private key PEM file here: // https://www.chilkatsoft.com/exampleData/dsa1024_secret.zip // The password is "secret". dsaKey := TPrivateKey.Create(Self); success := dsaKey.LoadEncryptedPemFile('qa_data/dsa/dsa1024_secret.pem','secret'); if (success <> 1) then begin Memo1.Lines.Add(dsaKey.LastErrorText); Exit; end; // To create the XML digital signature (i.e. embed the signature within // the XML), first specify what is desired, then call the method to // create the XML signature. // // For example, the application must provide the following: // - Where to put the signature. // - What to sign. // - The algorithms to be used. // - The key to be used for signing. // xmlSigGen := TChilkatXmlDSigGen.Create(Self); // In this example, we're going to put the signature within the Security element. // To specify the location, set the SigLocation property to the XML path to this element, // using vertical bar characters to separate tags. xmlSigGen.SigLocation := 'Envelope|Header|Security'; // An XML digital signature contains one or more references. These can be references to the parts // of the XML document to be signed (a same document reference), or can be external references. // This example will add a single same-document reference. We'll add a reference to the XML fragment // at Body, which is indicated by providing the value of the "ID" attribute (where "ID" is case // insensitive). In this case, we specify "abc" because Body has an Id="abc". // This causes the <Body> ... </Body> XML fragment to be signed. // // For each same-document reference, we must also indicate the hash algorithm and XML canonicalization // algorithm to be used. For this example we'll choose SHA1 and Exclusive XML Canonicalization. xmlSigGen.AddSameDocRef('abc','sha1','EXCL_C14N','',''); // Provide the DSA key to be used for signing: xmlSigGen.SetPrivateKey(dsaKey.ControlInterface); // We're leaving the following properties at their default values: // // - SigNamespacePrefix (default is "ds") // - SignedInfoCanonAlg (default is EXCL_C14N) // - KeyInfoType (default is "KeyValue", where the DSA public key is included in the Signature) // Note: Each Reference has it's own specified algorithms for XML canonicalization and hashing, // and the actual signature part (the SignedInfo) has it's own hash/canonicalization algorithm. // They may or may not be the same. In this example, we use Exclusive XML Canonicalization and SHA1 throughout. // The default SignedInfoDigestMethod is sha256, which is a good choice. This example will // change it to sha1. xmlSigGen.SignedInfoDigestMethod := 'sha1'; // OK, everything's specified, so let's create the XML digital signature: // This in-place signs the XML. If successful, sbXml will contain the // XML with the digital signature at the specified location. success := xmlSigGen.CreateXmlDSigSb(sbXml.ControlInterface); if (success <> 1) then begin Memo1.Lines.Add(xmlSigGen.LastErrorText); Exit; end; // Examine the signed XML: Memo1.Lines.Add(sbXml.GetAsString()); // Below is the signed XML that is produced. // Chilkat emits the Signature in compact form on a single line. Whitespace in XML signatures // matters. Chilkat's opinion is that writing the Signature without whitespace minimizes the chance // for problems with whatever software might be verifying the signature. // <?xml version="1.0" encoding="UTF-8" standalone="no"?> // <Envelope> // <Header> // <Security> // <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/2000/09/xmldsig#dsa-sha1"/><ds:Reference URI="#abc"><ds:Transforms><ds:Transform Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/></ds:Transforms><ds:DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"/><ds:DigestValue>77X3L6odxTBow1W1dIiqZW1foow=</ds:DigestValue></ds:Reference></ds:SignedInfo><ds:SignatureValue>Ci/KiAqoQLvNyK94n8TJwdJ6dVpIIy8tJg+9s8utmB92cW8lTd+U7g==</ds:SignatureValue><ds:KeyInfo><ds:KeyValue><ds:DSAKeyValue><ds:P>AN+Af9FvnqYl84Own8m/MHza9vVFEbpySOiWyeIM8diDjaES9i+UykaX9BGc0oaRJHtrHhe+gboMBGHfP+gYcgbqzeyVCi2kHghRD/TK7uI4jN8Yv8tfM6AO0QrDFfxFq4IV+qTZbSoCkbWaopQ+kEOY6B4btFxJ1YuE48mExMZ3</ds:P><ds:Q>AOCv5pwf4kvMW37Yzt0iH6URKOlD</ds:Q><ds:G>FO3eoDcpuU9Z25OQGFtC+M2ifczcKyRkFwTauGR3mIw0wePPiu3Ocr7A81SA8GQ9x3hWO5jyP//jL3jxYy8fgBg2RXwiic3nwT2rZfu50g6tPUpz1stKz/+Mxjulo6XuaMSOWwjU021IxVMzxQ1/L8QiwiIrwxvfQOaMY8HJgvw=</ds:G><ds:Y>JJmZQvWtrZ+Nb2YV47SfGAave8uOIedGlmg+CseoqKZC2aFcWM6kR0giUwQx834dhxQScRhqzxFxQPk/x+5hyG8LQbXW+BELmT1BiyodobYUAet4rSIt4EU4KU0iYw1drpcWT1jqI07l5xNi28heYSfSF5Odv2qwXxVKDSEeEkM=</ds:Y></ds:DSAKeyValue></ds:KeyValue></ds:KeyInfo></ds:Signature></Security> // </Header> // <Body Id="abc"> // <z:FooBar xmlns:z="https://www.example-code.com"/> // </Body> // </Envelope> // The above signed XML contains the DSA public key in the DSAKeyValue fragment (within the ds:KeyInfo). // The signature can easily be verified like this: verifier := TChilkatXmlDSig.Create(Self); // First load the XML containing the signature(s) to be verified. success := verifier.LoadSignatureSb(sbXml.ControlInterface); if (success <> 1) then begin Memo1.Lines.Add(verifier.LastErrorText); Exit; end; bVerified := verifier.VerifySignature(1); if (bVerified <> 1) then begin Memo1.Lines.Add(verifier.LastErrorText); end; Memo1.Lines.Add('Signature verified = ' + IntToStr(Ord(bVerified))); end; |
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