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(Tcl) Create XML Signature with External Data Reference

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.

Chilkat Tcl Extension Downloads

Chilkat Tcl Extension Downloads

load ./chilkat.dll

#  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:

set url "https://www.chilkatsoft.com/exampleData/addSignatureToThis.xml"
set http [new_CkHttp]

set sbXml [new_CkStringBuilder]

set success [CkHttp_QuickGetSb $http $url $sbXml]
if {[expr $success != 1]} then {
    puts [CkHttp_lastErrorText $http]
    delete_CkHttp $http
    delete_CkStringBuilder $sbXml
    exit
}

#  We'll use an RSA private key for signing.
set rsaKey [new_CkPrivateKey]

set success [CkPrivateKey_LoadPemFile $rsaKey "qa_data/rsa/rsaPrivKey_pkcs8.pem"]
if {[expr $success != 1]} then {
    puts [CkPrivateKey_lastErrorText $rsaKey]
    delete_CkHttp $http
    delete_CkStringBuilder $sbXml
    delete_CkPrivateKey $rsaKey
    exit
}

set xmlSigGen [new_CkXmlDSigGen]

#  Indicate were the Signature will be inserted:
CkXmlDSigGen_put_SigLocation $xmlSigGen "abc|xyz|jpg"

#  Provide the RSA key to be used for signing:
CkXmlDSigGen_SetPrivateKey $xmlSigGen $rsaKey

#  Fetch the JPG image data.
set jpgUrl "https://www.chilkatsoft.com/images/starfish.jpg"
set jpgData [new_CkBinData]

set success [CkHttp_QuickGetBd $http $jpgUrl $jpgData]
if {[expr $success != 1]} then {
    puts [CkHttp_lastErrorText $http]
    delete_CkHttp $http
    delete_CkStringBuilder $sbXml
    delete_CkPrivateKey $rsaKey
    delete_CkXmlDSigGen $xmlSigGen
    delete_CkBinData $jpgData
    exit
}

#  Add the external data reference:
CkXmlDSigGen_AddExternalBinaryRef $xmlSigGen $jpgUrl $jpgData "sha256" ""

#  Create the XML digital signature:
set success [CkXmlDSigGen_CreateXmlDSigSb $xmlSigGen $sbXml]
if {[expr $success != 1]} then {
    puts [CkXmlDSigGen_lastErrorText $xmlSigGen]
    delete_CkHttp $http
    delete_CkStringBuilder $sbXml
    delete_CkPrivateKey $rsaKey
    delete_CkXmlDSigGen $xmlSigGen
    delete_CkBinData $jpgData
    exit
}

#  Examine the XML that now contains the Signature:
puts [CkStringBuilder_getAsString $sbXml]

#  <?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>
# 

delete_CkHttp $http
delete_CkStringBuilder $sbXml
delete_CkPrivateKey $rsaKey
delete_CkXmlDSigGen $xmlSigGen
delete_CkBinData $jpgData

 

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