(Ruby) ScMinidriver - Find and Load Certificate from Smart Card or USB Token

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Demonstrates how to find and load a specific certificate located on a smart card or USB token.

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.

scmd = Chilkat::CkScMinidriver.new()

# 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() + "\n";
    exit
end

# If successful, the name of the currently inserted smart card is available:
print "Card name: " + scmd.cardName() + "\n";

# 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." + "\n";
end

# 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 = Chilkat::CkCert.new()
success = scmd.FindCert(certPart,partValue,cert)
if (success == false)
    print "Failed to find the certificate." + "\n";
else
    print "Successfully loaded the cert object from the smart card / USB token." + "\n";

    # 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.
end

# ...
# ...
# ...

# 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() + "\n";
end

# Delete the context when finished with the card.
success = scmd.DeleteContext()
if (success == false)
    print scmd.lastErrorText() + "\n";
end