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cardos: probe for transceive length

This commit is contained in:
Frank Morgner 2015-08-11 13:27:30 +02:00
parent 85b79a3332
commit 2e21163273
1 changed files with 26 additions and 0 deletions
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26
src/libopensc/card-cardos.c
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@ -165,6 +165,9 @@ static int cardos_have_2048bit_package(sc_card_t *card)
static int cardos_init(sc_card_t *card)
{
unsigned long flags, rsa_2048 = 0;
size_t data_field_length;
sc_apdu_t apdu;
u8 rbuf[2];
card->name = "CardOS M4";
card->cla = 0x00;
@ -195,6 +198,29 @@ static int cardos_init(sc_card_t *card)
card->caps |= SC_CARD_CAP_APDU_EXT;
}
/* probe DATA FIELD LENGTH with GET DATA */
sc_format_apdu(card, &apdu, SC_APDU_CASE_2_SHORT, 0xca, 0x01, 0x8D);
apdu.le = sizeof rbuf;
apdu.resp = rbuf;
apdu.resplen = sizeof(rbuf);
SC_TEST_RET(card->ctx, SC_LOG_DEBUG_NORMAL,
sc_transmit_apdu(card, &apdu),
"APDU transmit failed");
SC_TEST_RET(card->ctx, SC_LOG_DEBUG_NORMAL,
sc_check_sw(card, apdu.sw1, apdu.sw2),
"GET DATA command returned error");
if (apdu.resplen != 2)
return SC_ERROR_WRONG_LENGTH;
data_field_length = ((rbuf[0] << 8) | rbuf[1]);
/* strip the length of possible Lc and Le bytes */
if (card->caps & SC_CARD_CAP_APDU_EXT)
card->max_send_size = data_field_length - 6;
else
card->max_send_size = data_field_length - 3;
/* strip the length of SW bytes */
card->max_recv_size = data_field_length - 2;
if (rsa_2048 == 1) {
_sc_card_add_rsa_alg(card, 1280, flags, 0);
_sc_card_add_rsa_alg(card, 1536, flags, 0);