Sample code for 30+ languages & platforms
AutoIt

Create XML Digital Signature using a DSA Key

See more XML Digital Signatures Examples

Demonstrates how to create an XML digital signature using a DSA key.

This example requires Chilkat v9.5.0.69 or greater.

Chilkat AutoIt Downloads

Download Chilkat for AutoIt
AutoIt 
Local $bSuccess = False

;  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..

Local $sUrl = "https://www.chilkatsoft.com/exampleData/xmlToSign.xml"
$oHttp = ObjCreate("Chilkat.Http")
$oSbXml = ObjCreate("Chilkat.StringBuilder")
$bSuccess = $oHttp.QuickGetSb($sUrl,$oSbXml)
If ($bSuccess <> True) Then
    ConsoleWrite($oHttp.LastErrorText & @CRLF)
    Exit
EndIf

;  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".
$oDsaKey = ObjCreate("Chilkat.PrivateKey")
$bSuccess = $oDsaKey.LoadEncryptedPemFile("qa_data/dsa/dsa1024_secret.pem","secret")
If ($bSuccess <> True) Then
    ConsoleWrite($oDsaKey.LastErrorText & @CRLF)
    Exit
EndIf

;  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.
;  

$oXmlSigGen = ObjCreate("Chilkat.XmlDSigGen")

;  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.
$oXmlSigGen.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.
$oXmlSigGen.AddSameDocRef("abc","sha1","EXCL_C14N","","")

;  Provide the DSA key to be used for signing:
$oXmlSigGen.SetPrivateKey($oDsaKey)

;  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.
$oXmlSigGen.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.
$bSuccess = $oXmlSigGen.CreateXmlDSigSb($oSbXml)
If ($bSuccess <> True) Then
    ConsoleWrite($oXmlSigGen.LastErrorText & @CRLF)
    Exit
EndIf

;  Examine the signed XML:
ConsoleWrite($oSbXml.GetAsString() & @CRLF)

;  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:

$oVerifier = ObjCreate("Chilkat.XmlDSig")

;  First load the XML containing the signature(s) to be verified.
$bSuccess = $oVerifier.LoadSignatureSb($oSbXml)
If ($bSuccess <> True) Then
    ConsoleWrite($oVerifier.LastErrorText & @CRLF)
    Exit
EndIf

Local $bVerified = $oVerifier.VerifySignature(True)
If ($bVerified <> True) Then
    ConsoleWrite($oVerifier.LastErrorText & @CRLF)
EndIf

ConsoleWrite("Signature verified = " & $bVerified & @CRLF)