(Tcl) Sign Italian SPID Metadata XML

Demonstrates how to create an XML digital signature for Italian SPID Metadata.

Chilkat Tcl Extension Downloads Chilkat Tcl Extension Downloads

load ./chilkat.dll

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

set success 1

# Load the XML to be signed.
set sbXml [new_CkStringBuilder]

set success [CkStringBuilder_LoadFile $sbXml "qa_data/xml_dsig/spid_metadata.xml" "utf-8"]
if {$success == 0} then {
    puts "Failed to load the input file."
    delete_CkStringBuilder $sbXml
    exit
}

# The XML to sign contains XML such as this:

# <?xml version="1.0" encoding="utf-8"?>
# <md:EntityDescriptor xmlns:md="urn:oasis:names:tc:SAML:2.0:metadata" xmlns:ds="http://www.w3.org/2000/09/xmldsig#" entityID="https://***.it" ID="_AE17AFFF-A600-49D5-B81D-76EEA55B50FF">
#     <md:SPSSODescriptor protocolSupportEnumeration="urn:oasis:names:tc:SAML:2.0:protocol" AuthnRequestsSigned="true" WantAssertionsSigned="true">
#         <md:KeyDescriptor use="signing">
#             <ds:KeyInfo xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
#                 <ds:X509Data>
#                     <ds:X509Certificate>MIIF5...</ds:X509Certificate>
#                 </ds:X509Data>
#             </ds:KeyInfo>
#         </md:KeyDescriptor>
#         <md:KeyDescriptor use="encryption">
#             <ds:KeyInfo xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
#                 <ds:X509Data>
#                     <ds:X509Certificate>MIIF5...</ds:X509Certificate>
#                 </ds:X509Data>
#             </ds:KeyInfo>
#         </md:KeyDescriptor>
#         <md:SingleLogoutService Binding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST" Location="https://***.it/it-it/spid/logout"/>
#         <md:NameIDFormat>urn:oasis:names:tc:SAML:2.0:nameid-format:transient</md:NameIDFormat>
#         <md:AssertionConsumerService Binding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST" Location="https://***.it/it-it/spid/loginresp" index="0" isDefault="true"/>
#         <md:AttributeConsumingService index="1">
#             <md:ServiceName xml:lang="it">Servizi Online</md:ServiceName>
#             <md:ServiceDescription xml:lang="it">Accesso ai Servizi Online</md:ServiceDescription>
#             <md:RequestedAttribute Name="spidCode" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:basic"/>
#             <md:RequestedAttribute Name="name" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:basic"/>
#             <md:RequestedAttribute Name="familyName" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:basic"/>
#             <md:RequestedAttribute Name="fiscalNumber" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:basic"/>
#         </md:AttributeConsumingService>
#     </md:SPSSODescriptor>
#     <md:Organization>
#         <md:OrganizationName xml:lang="it">SomeCompany s.r.l.</md:OrganizationName>
#         <md:OrganizationDisplayName xml:lang="it">SomeCompany s.r.l.</md:OrganizationDisplayName>
#         <md:OrganizationURL xml:lang="it">https://***.it</md:OrganizationURL>
#     </md:Organization>
# </md:EntityDescriptor>

set gen [new_CkXmlDSigGen]

CkXmlDSigGen_put_SigLocation $gen "md:EntityDescriptor|md:SPSSODescriptor"
CkXmlDSigGen_put_SigLocationMod $gen 2
CkXmlDSigGen_put_SignedInfoCanonAlg $gen "EXCL_C14N"
CkXmlDSigGen_put_SignedInfoDigestMethod $gen "sha256"

# -------- Reference 1 --------
CkXmlDSigGen_AddSameDocRef $gen "_AE17AFFF-A600-49D5-B81D-76EEA55B50FF" "sha256" "EXCL_C14N" "" ""

# Provide a certificate + private key. (PFX password is test123)
set cert [new_CkCert]

set success [CkCert_LoadPfxFile $cert "qa_data/pfx/cert_test123.pfx" "test123"]
if {$success != 1} then {
    puts [CkCert_lastErrorText $cert]
    delete_CkStringBuilder $sbXml
    delete_CkXmlDSigGen $gen
    delete_CkCert $cert
    exit
}

CkXmlDSigGen_SetX509Cert $gen $cert 1

CkXmlDSigGen_put_KeyInfoType $gen "X509Data+KeyValue"
CkXmlDSigGen_put_X509Type $gen "Certificate"

CkXmlDSigGen_put_Behaviors $gen "IndentedSignature,ForceAddEnvelopedSignatureTransform,OmitAlreadyDefinedSigNamespace"

# Sign the XML...
set success [CkXmlDSigGen_CreateXmlDSigSb $gen $sbXml]
if {$success != 1} then {
    puts [CkXmlDSigGen_lastErrorText $gen]
    delete_CkStringBuilder $sbXml
    delete_CkXmlDSigGen $gen
    delete_CkCert $cert
    exit
}

# -----------------------------------------------

# Save the signed XML to a file.
set success [CkStringBuilder_WriteFile $sbXml "qa_output/signedXml.xml" "utf-8" 0]

puts [CkStringBuilder_getAsString $sbXml]

# ----------------------------------------
# Verify the signatures we just produced...
set verifier [new_CkXmlDSig]

set success [CkXmlDSig_LoadSignatureSb $verifier $sbXml]
if {$success != 1} then {
    puts [CkXmlDSig_lastErrorText $verifier]
    delete_CkStringBuilder $sbXml
    delete_CkXmlDSigGen $gen
    delete_CkCert $cert
    delete_CkXmlDSig $verifier
    exit
}

set numSigs [CkXmlDSig_get_NumSignatures $verifier]
set verifyIdx 0
while {$verifyIdx < $numSigs} {
    CkXmlDSig_put_Selector $verifier $verifyIdx
    set verified [CkXmlDSig_VerifySignature $verifier 1]
    if {$verified != 1} then {
        puts [CkXmlDSig_lastErrorText $verifier]
        delete_CkStringBuilder $sbXml
        delete_CkXmlDSigGen $gen
        delete_CkCert $cert
        delete_CkXmlDSig $verifier
        exit
    }

    set verifyIdx [expr $verifyIdx + 1]
}
puts "All signatures were successfully verified."

delete_CkStringBuilder $sbXml
delete_CkXmlDSigGen $gen
delete_CkCert $cert
delete_CkXmlDSig $verifier