static ssize_t cackey_get_data(struct cackey_slot *slot, unsigned char *buffer, size_t buffer_len, unsigned char oid[3]) {
	unsigned char cmd[] = {0x5C, 0x03, 0x00, 0x00, 0x00};
	unsigned char *buffer_p;
	size_t init_buffer_len, size;
	uint16_t respcode;
	int send_ret;

	CACKEY_DEBUG_PRINTF("Called with buffer_len = %llu", (unsigned long long) buffer_len);

	init_buffer_len = buffer_len;

	cmd[2] = oid[0];
	cmd[3] = oid[1];
	cmd[4] = oid[2];

	if (buffer_len < 2) {
		CACKEY_DEBUG_PRINTF("APDU GET DATA returned %lu bytes, which is too short for a BER-TLV response", (unsigned long) buffer_len);

		return(-1);
	}

	size = init_buffer_len;
	buffer_p = cackey_read_bertlv_tag(buffer, &buffer_len, 0x53, NULL, &size);

	if (buffer_p == NULL) {
		CACKEY_DEBUG_PRINTF("Tag decoding failed, returning in error.");

		return(-1);
	}

 */
static struct cackey_pcsc_identity *cackey_read_certs(struct cackey_slot *slot, struct cackey_pcsc_identity *certs, unsigned long *count) {
	cackey_pcsc_id_type check_id_type;
	struct cackey_pcsc_identity *curr_id;
	struct cackey_tlv_entity *ccc_tlv, *ccc_curr, *app_tlv, *app_curr;
	unsigned char *piv_oid, piv_oid_pivauth[] = {NISTSP800_73_3_OID_PIVAUTH}, piv_oid_signature[] = {NISTSP800_73_3_OID_SIGNATURE}, piv_oid_keymgt[] = {NISTSP800_73_3_OID_KEYMGT};
	unsigned char curr_aid[7];
	unsigned char buffer[1024 * 32], *buffer_p, *tmpbuf;
	unsigned long outidx = 0;
	char *piv_label;
	cackey_ret transaction_ret;
	ssize_t read_ret;
	size_t buffer_len, tmpbuflen;
	int certs_resizable;
	int send_ret, select_ret;