(Chilkat2-Python) Sign Italian SPID Metadata XML

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

Chilkat2 Python Downloads install with pip pip3 install chilkat2 or download... Python Module for Windows, Linux, Alpine Linux, MacOS, Solaris

import sys
import chilkat2

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

success = True

# Load the XML to be signed.
sbXml = chilkat2.StringBuilder()
success = sbXml.LoadFile("qa_data/xml_dsig/spid_metadata.xml","utf-8")
if (success == False):
    print("Failed to load the input file.")
    sys.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>

gen = chilkat2.XmlDSigGen()

gen.SigLocation = "md:EntityDescriptor|md:SPSSODescriptor"
gen.SigLocationMod = 2
gen.SignedInfoCanonAlg = "EXCL_C14N"
gen.SignedInfoDigestMethod = "sha256"

# -------- Reference 1 --------
gen.AddSameDocRef("_AE17AFFF-A600-49D5-B81D-76EEA55B50FF","sha256","EXCL_C14N","","")

# Provide a certificate + private key. (PFX password is test123)
cert = chilkat2.Cert()
success = cert.LoadPfxFile("qa_data/pfx/cert_test123.pfx","test123")
if (success != True):
    print(cert.LastErrorText)
    sys.exit()

gen.SetX509Cert(cert,True)

gen.KeyInfoType = "X509Data+KeyValue"
gen.X509Type = "Certificate"

gen.Behaviors = "IndentedSignature,ForceAddEnvelopedSignatureTransform,OmitAlreadyDefinedSigNamespace"

# Sign the XML...
success = gen.CreateXmlDSigSb(sbXml)
if (success != True):
    print(gen.LastErrorText)
    sys.exit()

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

# Save the signed XML to a file.
success = sbXml.WriteFile("qa_output/signedXml.xml","utf-8",False)

print(sbXml.GetAsString())

# ----------------------------------------
# Verify the signatures we just produced...
verifier = chilkat2.XmlDSig()
success = verifier.LoadSignatureSb(sbXml)
if (success != True):
    print(verifier.LastErrorText)
    sys.exit()

numSigs = verifier.NumSignatures
verifyIdx = 0
while verifyIdx < numSigs :
    verifier.Selector = verifyIdx
    verified = verifier.VerifySignature(True)
    if (verified != True):
        print(verifier.LastErrorText)
        sys.exit()

    verifyIdx = verifyIdx + 1

print("All signatures were successfully verified.")