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(Chilkat2-Python) Create XML Digital Signature using Certificate on Smart CardSee more ScMinidriver ExamplesDemonstrates how to load a certificate located on a smart card or USB token and then use it for creating an XML digital signature such that the cryptographic signing happens on the smart card.
import sys import chilkat2 # This example requires the Chilkat API to have been previously unlocked. # See Global Unlock Sample for sample code. scmd = chilkat2.ScMinidriver() # Reader names (smart card readers or USB tokens) can be discovered # via List Readers or Find Smart Cards readerName = "SCM Microsystems Inc. SCR33x USB Smart Card Reader 0" success = scmd.AcquireContext(readerName) if (success == False): print(scmd.LastErrorText) sys.exit() # If successful, the name of the currently inserted smart card is available: print("Card name: " + scmd.CardName) # If desired, perform regular PIN authentication with the smartcard. # For more details about smart card PIN authentication, see the Smart Card PIN Authentication Example retval = scmd.PinAuthenticate("user","000000") if (retval != 0): print("PIN Authentication failed.") # You can find a cerficate using any of the following certificate parts: # "subjectDN" -- The full distinguished name of the cert. # "subjectDN_withTags" -- Same as above, but in a format that includes the subject part tags, such as the "CN=" in "CN=something" # "subjectCN" -- The common name part (CN) of the certificate's subject. # "serial" -- The certificate serial number. # "serial:issuerCN" -- The certificate serial number + the issuer's common name, delimited with a colon char. # These are the same certificate parts that can be retrieved by listing certificates on the smart card (or USB token). # See List Certificates on Smart Card Example certPart = "subjectCN" partValue = "PIVKey E42D60A759D39147A26E0AF2FB1183C5" # If the certificate is found, it is loaded into the cert object. cert = chilkat2.Cert() success = scmd.FindCert(certPart,partValue,cert) if (success == False): print("Failed to find the certificate.") scmd.DeleteContext() sys.exit() print("Successfully loaded the cert object from the smart card / USB token.") # Note: When successful, the cert object is internally linked to the ScMinidriver object's authenticated session. # The cert object can now be used to sign or do other cryptographic operations that occur on the smart card / USB token. # If your application calls PinDeauthenticate or DeleteContext, the cert will no longer be able to sign on the smart card # because the smart card ScMinidriver session will no longer be authenticated or deleted. # ------------------------------------------------------------------------------------------------------------ # We have the certificate. Now let's do the XML digital signature.. # Create the following XML to be signed: # <?xml version="1.0" encoding="UTF-8" standalone="no" ?> # <SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/"> # <SOAP-ENV:Header> # <wsse:Security xmlns:wsse="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd" SOAP-ENV:mustUnderstand="1"></wsse:Security> # </SOAP-ENV:Header> # <SOAP-ENV:Body xmlns:SOAP-SEC="http://schemas.xmlsoap.org/soap/security/2000-12" SOAP-SEC:id="Body"> # <z:FooBar xmlns:z="http://example.com" /> # </SOAP-ENV:Body> # </SOAP-ENV:Envelope> xml = chilkat2.Xml() xml.Tag = "SOAP-ENV:Envelope" xml.AddAttribute("xmlns:SOAP-ENV","http://schemas.xmlsoap.org/soap/envelope/") xml.UpdateAttrAt("SOAP-ENV:Header|wsse:Security",True,"xmlns:wsse","http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd") xml.UpdateAttrAt("SOAP-ENV:Header|wsse:Security",True,"SOAP-ENV:mustUnderstand","1") xml.UpdateAttrAt("SOAP-ENV:Body",True,"xmlns:SOAP-SEC","http://schemas.xmlsoap.org/soap/security/2000-12") xml.UpdateAttrAt("SOAP-ENV:Body",True,"SOAP-SEC:id","Body") xml.UpdateAttrAt("SOAP-ENV:Body|z:FooBar",True,"xmlns:z","http://example.com") # Prepare for signing... gen = chilkat2.XmlDSigGen() # Indicate where the Signature will be inserted. gen.SigLocation = "SOAP-ENV:Envelope|SOAP-ENV:Header|wsse:Security" # Add a reference to the fragment of the XML to be signed. # Note: "Body" refers to the XML element having an "id" equal to "Body", where "id" is case insensitive # and where any namespace might qualify the attribute. In this case, the SOAP-ENV:Body fragment is signed # NOT because the tag = "Body", but because it has SOAP-SEC:id="Body" gen.AddSameDocRef("Body","sha1","EXCL_C14N","","") # (You can read about the SignedInfoPrefixList in the online reference documentation. It's optional..) gen.SignedInfoPrefixList = "wsse SOAP-ENV" # Provide the private key for signing via the certificate, and indicate that # we want the base64 of the certificate embedded in the KeyInfo. gen.KeyInfoType = "X509Data" gen.X509Type = "Certificate" # Note: Our certificate was loaded from the smartcard and is internally linked to the authenticated ScMinidriver session. # The signing will occur on the smart card using the chosen certificate. bUsePrivateKey = True success = gen.SetX509Cert(cert,bUsePrivateKey) if (success != True): print(gen.LastErrorText) sys.exit() # Everything's specified. Now create and insert the Signature sbXml = chilkat2.StringBuilder() xml.GetXmlSb(sbXml) success = gen.CreateXmlDSigSb(sbXml) if (success != True): print(gen.LastErrorText) sys.exit() # Examine the XML with the digital signature inserted print(sbXml.GetAsString()) # ------------------------------------------------------------------------------------------------------------ # Cleanup our ScMinidriver session... # When finished with operations that required authentication, you may if you wish, deauthenticate the session. success = scmd.PinDeauthenticate("user") if (success == False): print(scmd.LastErrorText) # Delete the context when finished with the card. success = scmd.DeleteContext() if (success == False): print(scmd.LastErrorText) |
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