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(PowerBuilder) Verify XML Signature with External Data Reference

Demonstrates how to verify an XML digital signature where the data is external. In this case, the data is a JPG file.

This example requires Chilkat v9.5.0.69 or greater.

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

integer li_rc
string ls_Url
oleobject loo_Http
oleobject loo_SbXml
integer li_Success
oleobject loo_Verifier
string ls_RefUri
oleobject loo_JpgData
integer li_BVerified

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

//  The XML containing the Signature to be verified contains the following:
//  <?xml version="1.0" encoding="UTF-8" standalone="no"?>
//  <abc>
//    <xyz>
//      <jpg>
//          <name>starfish.jpg</name>
//          <url>https://www.chilkatsoft.com/images/starfish.jpg</url>
//      <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="https://www.chilkatsoft.com/images/starfish.jpg"><ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/><ds:DigestValue>AOU810yJV5Np/DnO29qpObqiTSTTCDvxGsX5ayiTYXI=</ds:DigestValue></ds:Reference></ds:SignedInfo><ds:SignatureValue>MbHOti6nOh9DJP/u7u1+a1u0wRYIGEdaAVk5ehxqeBhcR4qvGvCQ7wLxcfDuwFG2grSg43ANxDYngLqZTeFb5nCfywcuNBQI8FrNRVY5hkyv6kDW1BVN8ot9qPYX9oHxJp1e+nMszIiSxqHX3XDI7YnvFt/0CyeO5JaQQEzXzIwqqb8iUNcH/bJzR6CrTf1hGuQ5MPorG0bRwbYPPHHzipUqHBinK8VbHobnxL7GQHAhR8k9gDD35kZcMxf/74U7pGO19ZzTbdJW5S7q4bVVxvsuU3itTbhHI60pOE14ibrjZtIrPZLVUD3TQqIIF04TChW2NXdYOo3+ij4ZnP8x+g==</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:Signature></jpg>
//    </xyz>
//  </abc>

//  The above XML is available at https://www.chilkatsoft.com/exampleData/xmlsig_external_jpg_reference.xml
//  First fetch the XML..

ls_Url = "https://www.chilkatsoft.com/exampleData/xmlsig_external_jpg_reference.xml"
loo_Http = create oleobject
li_rc = loo_Http.ConnectToNewObject("Chilkat_9_5_0.Http")
if li_rc < 0 then
    destroy loo_Http
    MessageBox("Error","Connecting to COM object failed")
    return
end if
loo_SbXml = create oleobject
li_rc = loo_SbXml.ConnectToNewObject("Chilkat_9_5_0.StringBuilder")

li_Success = loo_Http.QuickGetSb(ls_Url,loo_SbXml)
if li_Success <> 1 then
    Write-Debug loo_Http.LastErrorText
    destroy loo_Http
    destroy loo_SbXml
    return
end if

loo_Verifier = create oleobject
li_rc = loo_Verifier.ConnectToNewObject("Chilkat_9_5_0.XmlDSig")

//  Load the XML containing the signatures to be verified.
//  Note that this particular Signature already contains the RSA public key that will be used
//  for verification.
li_Success = loo_Verifier.LoadSignatureSb(loo_SbXml)
if li_Success <> 1 then
    Write-Debug loo_Verifier.LastErrorText
    destroy loo_Http
    destroy loo_SbXml
    destroy loo_Verifier
    return
end if

//  Get the Reference URI, which in this case is the URL to the binary data that was hashed.
//  This fetchs the URI attribute value from:  <ds:Reference URI="https://www.chilkatsoft.com/images/starfish.jpg">
ls_RefUri = loo_Verifier.ReferenceUri(0)
if loo_Verifier.LastMethodSuccess <> 1 then
    Write-Debug "No reference URI found."
    destroy loo_Http
    destroy loo_SbXml
    destroy loo_Verifier
    return
end if

//  Download the JPG data to be verified.
loo_JpgData = create oleobject
li_rc = loo_JpgData.ConnectToNewObject("Chilkat_9_5_0.BinData")

li_Success = loo_Http.QuickGetBd(ls_RefUri,loo_JpgData)
if li_Success <> 1 then
    Write-Debug loo_Http.LastErrorText
    destroy loo_Http
    destroy loo_SbXml
    destroy loo_Verifier
    destroy loo_JpgData
    return
end if

//  Provide the JPG data to the verifier
loo_Verifier.SetRefDataBd(0,loo_JpgData)

//  Verify the signature
li_BVerified = loo_Verifier.VerifySignature(1)
Write-Debug "Signature verified = " + string(li_BVerified)


destroy loo_Http
destroy loo_SbXml
destroy loo_Verifier
destroy loo_JpgData

 

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