Tcl

ScMinidriver - Get Public Keys from Smart Card Key Container

See more ScMinidriver Examples

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. Tcl

load ./chilkat.dll

set success 0

#  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:

#  

set scmd [new_CkScMinidriver]

#  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
set readerName "Alcor Micro USB Smart Card Reader 0"
set success [CkScMinidriver_AcquireContext $scmd $readerName]
if {$success == 0} then {
    puts [CkScMinidriver_lastErrorText $scmd]
    delete_CkScMinidriver $scmd
    exit
}

#  If successful, the name of the currently inserted smart card is available:
puts "Card name: [CkScMinidriver_cardName $scmd]"

#  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.
set pubkey_sig [new_CkPublicKey]

set pubkey_kex [new_CkPublicKey]

set success [CkScMinidriver_GetContainerKeys $scmd 7 $pubkey_sig $pubkey_kex]
if {$success == 0} then {
    puts [CkScMinidriver_lastErrorText $scmd]
    delete_CkScMinidriver $scmd
    delete_CkPublicKey $pubkey_sig
    delete_CkPublicKey $pubkey_kex
    exit
}

if {[CkPublicKey_get_Empty $pubkey_sig] == 1} then {
    puts "No signature key is present."
} else {
    puts "Signature key:"
    puts [CkPublicKey_getPem $pubkey_sig 1]
}

if {[CkPublicKey_get_Empty $pubkey_kex] == 1} then {
    puts "No Key Exchange key is present."
} else {
    puts "Key Exchange key:"
    puts [CkPublicKey_getPem $pubkey_kex 1]
}

CkScMinidriver_DeleteContext $scmd

puts "Success."

#  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-----

delete_CkScMinidriver $scmd
delete_CkPublicKey $pubkey_sig
delete_CkPublicKey $pubkey_kex