(Ruby) PKCS11 Find Specific Certificate on Smart Card or USB Token

See more PKCS11 Examples

This example code shows how to find a particular certificate on a smart card or USB token.

Note: This example requires Chilkat v9.5.0.88 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()

# Set your shared lib path -- either a full path to the DLL, .so, or .dylib,
# or just the filename if the driver is in a location that can be automatically found. (Such as in C:\Windows\System32)
pkcs11.put_SharedLibPath("C:/Program Files (x86)/Gemalto/IDGo 800 PKCS#11/IDPrimePKCS1164.dll")

success = pkcs11.Initialize()
if (success == false)
    print pkcs11.lastErrorText() + "\n";
    exit
end

# Pass -1 for the slotID to open a session on the first non-empty slot.
slotID = -1

# Open a session.
readWrite = true
success = pkcs11.OpenSession(slotID,readWrite)
if (success == false)
    print pkcs11.lastErrorText() + "\n";
    exit
end

# Make it an authenticated session by calling Login.
# 
# If we don't authenticate, then we won't be able to see the private keys, and thus
# we won't know which certificates have an associated private key stored on the smart card.

# The smart card PIN is passed to the Login method.
# userType 1 indicates a "Normal User".
userType = 1
pin = "0000"
success = pkcs11.Login(userType,pin)
if (success == false)
    print pkcs11.lastErrorText() + "\n";
    success = pkcs11.CloseSession()
    exit
end

# --------------------------------------------------------------------------
# The FindCert method can find a particular certificate in a number of different ways.
# I'll demonstrate some common ways..

# 1) In many cases you'll be working with a smart card that contains one certificate that is to be used for 
# signing, and it is the certificate that is associated with the private key also stored on the smart card (or USB token).
# There may be other certificates on the card, but these are the issuer certificates in the chain of authentication.
# You're just interested in getting the certificate with the private key.
# You can do it like this:
cert = Chilkat::CkCert.new()
# Pass the keyword "privateKey" in the 1st argument, and an empty string in the 2nd arg.
# This returns the 1st certificate that has a private key.
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";
end

# 2) Find a certificate by the Subject Common Name
success = pkcs11.FindCert("subjectCN","Chil application account (8c9be8e0-5544-4cd0-9062-290fbff353a7)",cert)
if (success == true)
    print "Found: " + cert.subjectCN() + "\n";
else
    print "Not found: " + cert.subjectCN() + "\n";
end

# 3) Find a certificate by hex serial number
success = pkcs11.FindCert("serial","5087bf1feda006af54a02f23a851104948acc26f",cert)
if (success == true)
    print "Found: " + cert.serialNumber() + "\n";
else
    print "Not found: " + cert.serialNumber() + "\n";
end

# 4) Find a certificate by hex serial number and Issuer Common Name
success = pkcs11.FindCert("serial:issuerCN","5087bf1feda006af54a02f23a851104948acc26f:Ibanity Production Third Party Application CA",cert)
if (success == true)
    print "Found: " + cert.subjectCN() + "\n";
else
    print "Not found: " + cert.subjectCN() + "\n";
end

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

# 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";