/*

 * PKCS15 emulation layer for Slovak eID card

 *

 * Copyright (C) 2022 Juraj Šarinay <juraj@sarinay.com>

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2.1 of the License, or (at your option) any later version.

 *

 * This library is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with this library; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

 *

 * based on the PKCS15 emulation layer for EstEID card by Martin Paljak

 */

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

#include <stdlib.h>

#include <string.h>

#include "common/compat_strlcpy.h"

#include "internal.h"

#include "log.h"

#include "pkcs15.h"

static const struct sc_aid skeid_aid_qes = {{0xE8, 0x28, 0xBD, 0x08, 0x0F, 0xA0, 0x00, 0x00, 0x08, 0x51, 0x00, 0x00, 0x11}, 13};

static int sc_pkcs15emu_skeid_init(sc_pkcs15_card_t * p15card)

{

  int r;

  int i;

  size_t sn_len;

  char *buf;

  set_string(&p15card->tokeninfo->label, "eID karta");

  set_string(&p15card->tokeninfo->manufacturer_id, "Atos Information Technology GmbH");

  sn_len = p15card->card->serialnr.len;

  if (sn_len > 0) {

    buf = malloc(2 * sn_len + 1);

    if (!buf) return SC_ERROR_OUT_OF_MEMORY;

    sc_bin_to_hex(p15card->card->serialnr.value, sn_len, buf,

      2 * sn_len + 1, 0);

    p15card->tokeninfo->serial_number = buf;

  }

  p15card->tokeninfo->flags = SC_PKCS15_TOKEN_PRN_GENERATION | SC_PKCS15_TOKEN_READONLY;

  /* add certificates */

  const char *skeid_cert_names[3] = {

    "Kvalifikovany certifikat pre elektronicky podpis",

    "Certifikat pre elektronicky podpis",

    "Sifrovaci certifikat"

  };

  const char *skeid_cert_paths[3] = {

    "3f0001030201",

    "3f0001030202",

    "3f0001030203"

  };

  for (i = 0; i < 3; i++) {

    struct sc_pkcs15_cert_info cert_info;

    struct sc_pkcs15_object cert_obj;

    memset(&cert_info, 0, sizeof(cert_info));

    memset(&cert_obj, 0, sizeof(cert_obj));

    cert_info.id.value[0] = i + 1;

    cert_info.id.len = 1;

    sc_format_path(skeid_cert_paths[i], &cert_info.path);

    strlcpy(cert_obj.label, skeid_cert_names[i], sizeof(cert_obj.label));

    r = sc_pkcs15emu_add_x509_cert(p15card, &cert_obj, &cert_info);

    LOG_TEST_RET(p15card->card->ctx, r, "Error adding certificate.");

  }

  /* add pins */

  const char *skeid_pin_names[2] = {

    "BOK",

    "Podpisovy PIN"

  };

  const unsigned int skeid_pin_max_length[2] = {6, 10};

  const unsigned int skeid_pin_max_tries[2] = {5, 3};

  const int skeid_pin_ref[2] = {0x03, 0x87};

  const char *skeid_pin_paths[2] = {"3F00", "3F000101"};

  const unsigned int skeid_pin_flags[2] = {SC_PKCS15_PIN_FLAG_CASE_SENSITIVE | SC_PKCS15_PIN_FLAG_EXCHANGE_REF_DATA | SC_PKCS15_PIN_FLAG_INITIALIZED,

    SC_PKCS15_PIN_FLAG_CASE_SENSITIVE | SC_PKCS15_PIN_FLAG_LOCAL | SC_PKCS15_PIN_FLAG_EXCHANGE_REF_DATA | SC_PKCS15_PIN_FLAG_INITIALIZED};

  for (i = 0; i < 2; i++) {

    struct sc_pkcs15_auth_info pin_info;

    struct sc_pkcs15_object pin_obj;

    memset(&pin_info, 0, sizeof(pin_info));

    memset(&pin_obj, 0, sizeof(pin_obj));

    pin_info.auth_id.len = 1;

    pin_info.auth_id.value[0] = i + 1;

    pin_info.auth_type = SC_PKCS15_PIN_AUTH_TYPE_PIN;

    pin_info.attrs.pin.reference = skeid_pin_ref[i];

    pin_info.attrs.pin.flags = skeid_pin_flags[i];

    pin_info.attrs.pin.type = SC_PKCS15_PIN_TYPE_ASCII_NUMERIC;

    pin_info.attrs.pin.min_length = 6;

    pin_info.attrs.pin.max_length = skeid_pin_max_length[i];

    pin_info.max_tries = skeid_pin_max_tries[i];

    strlcpy(pin_obj.label, skeid_pin_names[i], sizeof(pin_obj.label));

    pin_obj.flags = skeid_pin_flags[i];

    sc_format_path(skeid_pin_paths[i], &pin_info.path);

    r = sc_pkcs15emu_add_pin_obj(p15card, &pin_obj, &pin_info);

    LOG_TEST_RET(p15card->card->ctx, r, "Error adding PIN.");

  }

  /* add private keys */

  const u8 skeid_prkey_pin[3] = {2, 1, 1};

  /* store seIdentifier rather than keyReference */

  const int skeid_prkey_ref[3] = {0x01, 0x34, 0x44};

  const int skeid_prkey_usage[3] =

    { SC_PKCS15_PRKEY_USAGE_NONREPUDIATION | SC_PKCS15_PRKEY_USAGE_SIGN,

      SC_PKCS15_PRKEY_USAGE_SIGN,

      SC_PKCS15_PRKEY_USAGE_DECRYPT

    };

  const char *skeid_prkey_paths[3] = {"3F000101", "3F000102", "3F000102"};

  const char *skeid_prkey_name[3] = {

    "Podpisovy kluc (KEP)",

    "Podpisovy kluc",

    "Sifrovaci kluc",

  };

  for (i = 0; i < 3; i++) {

    struct sc_pkcs15_prkey_info prkey_info;

    struct sc_pkcs15_object prkey_obj;

    memset(&prkey_info, 0, sizeof(prkey_info));

    memset(&prkey_obj, 0, sizeof(prkey_obj));

    prkey_info.id.len = 1;

    prkey_info.id.value[0] = i + 1;

    prkey_info.native = 1;

    prkey_info.key_reference = skeid_prkey_ref[i];

    prkey_info.modulus_length = 3072;

    sc_format_path(skeid_prkey_paths[i], &prkey_info.path);

    prkey_info.usage = skeid_prkey_usage[i];

    strlcpy(prkey_obj.label, skeid_prkey_name[i], sizeof(prkey_obj.label));

    prkey_obj.auth_id.len = 1;

    prkey_obj.auth_id.value[0] = skeid_prkey_pin[i];

    if (i == 0) prkey_obj.user_consent = 1;

    prkey_obj.flags = SC_PKCS15_CO_FLAG_PRIVATE;

    r = sc_pkcs15emu_add_rsa_prkey(p15card, &prkey_obj, &prkey_info);

    LOG_TEST_RET(p15card->card->ctx, r, "Error adding private key.");

  }

  LOG_FUNC_RETURN(p15card->card->ctx, SC_SUCCESS);

}

int sc_pkcs15emu_skeid_init_ex(sc_pkcs15_card_t *p15card, struct sc_aid *aid)

{

  int r = SC_ERROR_WRONG_CARD;

  if (p15card->card->type == SC_CARD_TYPE_SKEID_V3

    && (aid == NULL || (aid->len == skeid_aid_qes.len && !memcmp(aid->value, &skeid_aid_qes.value, skeid_aid_qes.len))))

    r = sc_pkcs15emu_skeid_init(p15card);

  return r;

}