(Ruby) PKCS11 XML Signature using Certificate and Private Key on Smart Card / USB Token

See more PKCS11 Examples

Sample code showing how to use PKCS11 to create an XML digital signature with a certificate and private key stored on a smart card or USB token.

Note: This example requires Chilkat v9.5.0.96 or later.

Chilkat Ruby Downloads install from rubygems.org gem install chilkat or download... Ruby Library for Windows, MacOS, Linux, Alpine Linux

require 'chilkat'

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

# Note: Chilkat's PKCS11 implementation runs on Windows, Linux, Mac OS X, and other supported operating systems.

pkcs11 = Chilkat::CkPkcs11.new()

# This example is tested on Windows using a Giesecke and Devrient Sm@rtCafe Expert 3.2 smart card.
# You will use the DLL (or shared lib) provided by your smart card vendor, or a DLL compatible with your smart card.
# On Windows, if the DLL is located in C:\Windows\System32, specify only the filename.
# Otherwise provide the full path.
pkcs11.put_SharedLibPath("aetpkss1.dll")

# Make it an authenticated session by calling Login.
userType = 1
# Make sure to use the correct PIN for your smart card..
pin = "0000"

success = pkcs11.QuickSession(userType,pin)
if (success == false)
    print pkcs11.lastErrorText() + "\n";
    exit
end

# Get the certificate (on the smart card) that has a private key.
cert = Chilkat::CkCert.new()
success = pkcs11.FindCert("privateKey","",cert)
if (success == true)
    print "Cert with private key: " + cert.subjectCN() + "\n";
else
    print "No certificates having a private key were found." + "\n";
    success = pkcs11.CloseSession()
    exit
end

# --------------------------------------------------------------------------
# At this point, we have the cert to be used for signing.
# Our XML signing code is the same as for a cert obtained from any other source..

# First generate the following XML to be signed:
# Use this online tool to generate code from sample XML: 
# Generate Code to Create XML

# <?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 = Chilkat::CkXml.new()
xml.put_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")

gen = Chilkat::CkXmlDSigGen.new()

# Indicate where the Signature will be inserted.
gen.put_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.put_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.put_KeyInfoType("X509Data")
gen.put_X509Type("Certificate")

bUsePrivateKey = true
success = gen.SetX509Cert(cert,bUsePrivateKey)
if (success != true)
    print gen.lastErrorText() + "\n";
    success = pkcs11.CloseSession()
    exit
end

# Everything's specified.  Now create and insert the Signature
sbXml = Chilkat::CkStringBuilder.new()
xml.put_EmitCompact(true)
xml.GetXmlSb(sbXml)

success = gen.CreateXmlDSigSb(sbXml)
if (success != true)
    print gen.lastErrorText() + "\n";
    success = pkcs11.CloseSession()
    exit
end

# Examine the XML with the digital signature inserted
print sbXml.getAsString() + "\n";

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

# Revert to an unauthenticated session by calling Logout.
success = pkcs11.Logout()
if (success == false)
    print pkcs11.lastErrorText() + "\n";
    success = pkcs11.CloseSession()
    exit
end

# When finished, close the session.
# It is important to close the session (memory leaks will occur if the session is not properly closed).
success = pkcs11.CloseSession()
if (success == false)
    print pkcs11.lastErrorText() + "\n";
    exit
end

print "Success." + "\n";