Ruby

ScMinidriver - Get Public Keys from Smart Card Key Container

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Demonstrates how to query a key container on a smart card (or USB token) to get the public part of the private keys that are present. A key container can hold two separate private keys -- one in the "signature" position, and the other in the "key exchange" position. Ruby

require 'chilkat'

success = false

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

#  Chilkat recommends the following free tool for interactively examining the contents of your smart card
#  through the ScMinidriver interface:  MGTEK Tool for Minidriver enabled Smart Cards

#  Let's first look at our smart card..
#  Here's the view of our Gemalto (Thales) IDPrime MD T=0 smart card in the MGTEK tool:

#  

scmd = Chilkat::CkScMinidriver.new()

#  First we need to acquire a context to the smart card in the reader where it is inserted.
#  Reader names (smart card readers or USB tokens) can be discovered
#  via List Readers or Find Smart Cards
readerName = "Alcor Micro 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";

#  We likely shouldn't need to authenticate with the smart card (use a PIN) to simply get a public key,
#  so we can skip the PIN authenticatin step..

#  Let's get the key(s) present in Container #7.
#  In our case (shown in the image above), there is a private key in the "key exchange" position, but no key in the "signature" position.
pubkey_sig = Chilkat::CkPublicKey.new()
pubkey_kex = Chilkat::CkPublicKey.new()

success = scmd.GetContainerKeys(7,pubkey_sig,pubkey_kex)
if (success == false)
    print scmd.lastErrorText() + "\n";
    exit
end

if (pubkey_sig.get_Empty() == true)
    print "No signature key is present." + "\n";
else
    print "Signature key:" + "\n";
    print pubkey_sig.getPem(true) + "\n";
end

if (pubkey_kex.get_Empty() == true)
    print "No Key Exchange key is present." + "\n";
else
    print "Key Exchange key:" + "\n";
    print pubkey_kex.getPem(true) + "\n";
end

scmd.DeleteContext()

print "Success." + "\n";

#  Here's the output of the above sample code:

#  Card name: IDPrime MD T=0
#  No signature key is present.
#  Key Exchange key:
#  -----BEGIN RSA PUBLIC KEY-----
#  MIIBCgKCAQEAsXeRhM55P13FbpNcXAMR3olbw2Wa6keZIHu5YTZYUBTlYWId+pNi
#  wUz3zFIEo+0IfYR0H27ybIycQO+1IIzJofUFNMAL3tZps2OKPlsjuCPls6kXpXhv
#  /gvhux8LrCtp4PcKWqJ6QVOZKChc7WAx40qFWzHi57ueqRTv3x0kESqGg/VjsqyT
#  Evb55psJO2RsfhLT7+YVh3hImRM3RDaJdkTkPuOxeFyT6N7VXD09329sLuS3QkUb
#  E9zEKDnz9X3d8dEQdJhSI9ba5fxl8R7fu8pB67ElfzFml96X1jLFtzy1pzOT5Fc4
#  ROcaqlYckVzdBq9sxezm6MYmDBjNAcibRwIDAQAB
#  -----END RSA PUBLIC KEY-----