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[godwinamila]

Hi

I have a waver application that communicate with java card. When I send a APDU to applet it gives a response. I am checking this response as follows

i = twin_t1_apdu(sizeof(t_authenticate), buf);
u16 ret;

ret = buf[i - 3];
ret <<= 8;
ret |= buf[i - 2];

if (ret == 0x9000){
ret_data[0] = 0x90;
ret_data[1] = 0x00;
}else{
ret_data[0] = 0x6e;
ret_data[1] = 0x04;
}


By using this I get 9000 when success the command and when fail it gives 6e04. I need to get the exact response that comes from applet. Here every time when getting a error it gives 6e04. How can unwrap this u16 ret and fill it into a buf_B and send it back.

If someone can give a idea to sort out this issue it'll be a great help to continue my work.

Regards
Amila

[pz]

You get T=1 packet, SW1/SW2 is at the end pos minus 1, see T=1 spec.

j = twin_t1_apdu (len, buf);

ret = buf[j - 3];
ret <<= 8;
ret |= buf[j - 2];