PowerBuilder

Create XML Signature with External Data Reference

See more XML Digital Signatures Examples

Demonstrates how to create 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.

PowerBuilder

integer li_rc
integer li_Success
string ls_Url
oleobject loo_Http
oleobject loo_SbXml
oleobject loo_RsaKey
oleobject loo_XmlSigGen
string ls_JpgUrl
oleobject loo_JpgData

li_Success = 0

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

// This example inserts an XML signature in the following XML:

// <?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>
//     </jpg>
//   </xyz>
// </abc>

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

ls_Url = "https://www.chilkatsoft.com/exampleData/addSignatureToThis.xml"
loo_Http = create oleobject
li_rc = loo_Http.ConnectToNewObject("Chilkat.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.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

// We'll use an RSA private key for signing.  
loo_RsaKey = create oleobject
li_rc = loo_RsaKey.ConnectToNewObject("Chilkat.PrivateKey")

li_Success = loo_RsaKey.LoadPemFile("qa_data/rsa/rsaPrivKey_pkcs8.pem")
if li_Success <> 1 then
    Write-Debug loo_RsaKey.LastErrorText
    destroy loo_Http
    destroy loo_SbXml
    destroy loo_RsaKey
    return
end if

loo_XmlSigGen = create oleobject
li_rc = loo_XmlSigGen.ConnectToNewObject("Chilkat.XmlDSigGen")

// Indicate were the Signature will be inserted:
loo_XmlSigGen.SigLocation = "abc|xyz|jpg"

// Provide the RSA key to be used for signing:
loo_XmlSigGen.SetPrivateKey(loo_RsaKey)

// Fetch the JPG image data.
ls_JpgUrl = "https://www.chilkatsoft.com/images/starfish.jpg"
loo_JpgData = create oleobject
li_rc = loo_JpgData.ConnectToNewObject("Chilkat.BinData")

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

// Add the external data reference:
loo_XmlSigGen.AddExternalBinaryRef(ls_JpgUrl,loo_JpgData,"sha256","")

// Create the XML digital signature:
li_Success = loo_XmlSigGen.CreateXmlDSigSb(loo_SbXml)
if li_Success <> 1 then
    Write-Debug loo_XmlSigGen.LastErrorText
    destroy loo_Http
    destroy loo_SbXml
    destroy loo_RsaKey
    destroy loo_XmlSigGen
    destroy loo_JpgData
    return
end if

// Examine the XML that now contains the Signature:
Write-Debug loo_SbXml.GetAsString()

// <?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>ApHRr6nilNrzt3dLveC9zlPoSllaCMfHsbAwr+vYBPkHkJ4wD5LzDDhi1tSJZAAeTckmvSqIG3Wi0rgXQiSM644MD3coBFx4QgrY+GZ+XJJE2Y0Ye3VvaQBiRdUW3INGsW4GLubncgQk5JhuAQjo6O/GKpfEuYqUJj/6CLHLQwMPwbZ2043ykgzuPFoOZf6EydJMBAn1ORMvrpUn+zuA9UngOTGap6eWE4CeiNx23BRC2wSztbUjdCLcqXvgiYu/v0tBNaTcwy7b6+IFtwv/lNUUBUQJ/3p+aErzFn3wLeH3yeqpDCU0U6Dqu5SS1jYupcWWsLHJjYnj2066DPJi/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>
// 


destroy loo_Http
destroy loo_SbXml
destroy loo_RsaKey
destroy loo_XmlSigGen
destroy loo_JpgData