To continue the list of PC/SC wrappers initiated in 2010 with "
PC/SC sample in different languages" I now present a sample in
go.
scard go wrapper
I used the
scard go wrapper from Michael Gehring.
The github project does not provide any documentation. You can get
some help from a previous project
go.pcsclite also from Michael Gehring.
The scard wrapper API has a nice
godoc page.
Installation
The installation is quiet simple.
$ cd foobar
$ export GOPATH=$(pwd)
$ go get github.com/ebfe/scard
I used the default
golang-go package on Debian stable (jessie 8.5).
$ go version
go version go1.3.3 linux/amd64
Sample source code
package main
import (
"fmt"
"github.com/ebfe/scard"
)
func main() {
// Establish a PC/SC context
context, err := scard.EstablishContext()
if err != nil {
fmt.Println("Error EstablishContext:", err)
return
}
// Release the PC/SC context (when needed)
defer context.Release()
// List available readers
readers, err := context.ListReaders()
if err != nil {
fmt.Println("Error ListReaders:", err)
return
}
// Use the first reader
reader := readers[0]
fmt.Println("Using reader:", reader)
// Connect to the card
card, err := context.Connect(reader, scard.ShareShared, scard.ProtocolAny)
if err != nil {
fmt.Println("Error Connect:", err)
return
}
// Disconnect (when needed)
defer card.Disconnect(scard.LeaveCard)
// Send select APDU
var cmd_select = []byte{0x00, 0xa4, 0x04, 0x00, 0x0A, 0xA0,
0x00, 0x00, 0x00, 0x62, 0x03, 0x01, 0x0C, 0x06, 0x01}
rsp, err := card.Transmit(cmd_select)
if err != nil {
fmt.Println("Error Transmit:", err)
return
}
fmt.Println(rsp)
// Send command APDU
var cmd_command = []byte{0x00, 0x00, 0x00, 0x00}
rsp, err = card.Transmit(cmd_command)
if err != nil {
fmt.Println("Error Transmit:", err)
return
}
fmt.Println(rsp)
for i := 0; i < len(rsp)-2; i++ {
fmt.Printf("%c", rsp[i])
}
fmt.Println()
}
Remarks
You can get another sample code
example_test.go in the scard project. This sample code greatly helped me implement my own sample code.
Results
$ go run hello_world.go
Using reader: Gemalto PC Twin Reader (70D7E2EE) 00 00
[144 0]
[72 101 108 108 111 32 119 111 114 108 100 33 144 0]
Hello world!
Conclusion
The github project
scard has no documentation or README file. After discussion with Michael Gehring it is on purpose.
This blog article should give more visibility to the project.
