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/usr/include/cacard/cac.h is in libcacard-dev 1:2.5.0-3.

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/*
 * defines the entry point for the cac card. Only used by cac.c anc
 * vcard_emul_type.c
 *
 * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
 * See the COPYING file in the top-level directory.
 */
#ifndef CAC_H
#define CAC_H 1
#include "vcard.h"
#include "vreader.h"

#define CAC_GET_PROPERTIES  0x56
#define CAC_GET_ACR         0x4c
#define CAC_READ_BUFFER     0x52
#define CAC_UPDATE_BUFFER   0x58
#define CAC_SIGN_DECRYPT    0x42
#define CAC_GET_CERTIFICATE 0x36

/*
 * Initialize the cac card. This is the only public function in this file. All
 * the rest are connected through function pointers.
 */
VCardStatus cac_card_init(VReader *reader, VCard *card, const char *params,
              unsigned char * const *cert, int cert_len[],
              VCardKey *key[] /* adopt the keys*/,
              int cert_count);

/* not yet implemented */
VCardStatus cac_is_cac_card(VReader *reader);
#endif