/src/opensc/src/libopensc/card-starcos.c

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/*
 * card-starcos.c: Support for STARCOS SPK 2.3 cards
 *
 * Copyright (C) 2003  Jörn Zukowski <zukowski@trustcenter.de> and
 *                     Nils Larsch   <larsch@trustcenter.de>, TrustCenter AG
 *
 * 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
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <stdlib.h>
#include <string.h>

#include "asn1.h"
#include "cardctl.h"
#include "internal.h"
#include "iso7816.h"

// clang-format off
static const struct sc_atr_table starcos_atrs[] = {
  { "3B:B7:94:00:c0:24:31:fe:65:53:50:4b:32:33:90:00:b4", NULL, NULL, SC_CARD_TYPE_STARCOS_GENERIC, 0, NULL },
  { "3B:B7:94:00:81:31:fe:65:53:50:4b:32:33:90:00:d1", NULL, NULL, SC_CARD_TYPE_STARCOS_GENERIC, 0, NULL },
  { "3b:b7:18:00:c0:3e:31:fe:65:53:50:4b:32:34:90:00:25", NULL, NULL, SC_CARD_TYPE_STARCOS_GENERIC, 0, NULL },
  { "3b:d8:18:ff:81:b1:fe:45:1f:03:80:64:04:1a:b4:03:81:05:61", NULL, NULL, SC_CARD_TYPE_STARCOS_V3_4, 0, NULL },
  { "3b:d3:96:ff:81:b1:fe:45:1f:07:80:81:05:2d", NULL, NULL, SC_CARD_TYPE_STARCOS_V3_4, 0, NULL },
  { "3B:9B:96:C0:0A:31:FE:45:80:67:04:1E:B5:01:00:89:4C:81:05:45", NULL, NULL, SC_CARD_TYPE_STARCOS_V3_5, 0, NULL },
  { "3B:DB:96:FF:81:31:FE:45:80:67:05:34:B5:02:01:C0:A1:81:05:3C", NULL, NULL, SC_CARD_TYPE_STARCOS_V3_5, 0, NULL },
  { "3B:D9:96:FF:81:31:FE:45:80:31:B8:73:86:01:C0:81:05:02", NULL, NULL, SC_CARD_TYPE_STARCOS_V3_5, 0, NULL },
  { "3B:DF:96:FF:81:31:FE:45:80:5B:44:45:2E:42:4E:4F:54:4B:31:31:31:81:05:A0", NULL, NULL, SC_CARD_TYPE_STARCOS_V3_5, 0, NULL },
  { "3B:DF:96:FF:81:31:FE:45:80:5B:44:45:2E:42:4E:4F:54:4B:31:30:30:81:05:A0", NULL, NULL, SC_CARD_TYPE_STARCOS_V3_5, 0, NULL },
  { "3B:D9:96:FF:81:31:FE:45:80:31:B8:73:86:01:E0:81:05:22", NULL, NULL, SC_CARD_TYPE_STARCOS_V3_5, 0, NULL },
  { "3B:D0:97:FF:81:B1:FE:45:1F:07:2B", NULL, NULL, SC_CARD_TYPE_STARCOS_V3_4, 0, NULL },
  { "3B:D0:96:FF:81:B1:FE:45:1F:07:2A", NULL, NULL, SC_CARD_TYPE_STARCOS_V3_4, 0, NULL },
  { "3b:df:96:ff:81:31:fe:45:80:5b:44:45:2e:42:41:5f:53:43:33:35:32:81:05:b5", NULL, NULL, SC_CARD_TYPE_STARCOS_V3_5_ESIGN, 0, NULL },
  { NULL, NULL, NULL, 0, 0, NULL }
};
// clang-format on

static struct sc_card_operations starcos_ops;
static struct sc_card_operations *iso_ops = NULL;

static struct sc_card_driver starcos_drv = {
  "STARCOS",
  "starcos",
  &starcos_ops,
  NULL, 0, NULL
};

static const struct sc_card_error starcos_errors[] =
{
  { 0x6600, SC_ERROR_INCORRECT_PARAMETERS, "Error setting the security env"},
  { 0x66F0, SC_ERROR_INCORRECT_PARAMETERS, "No space left for padding"},
  { 0x69F0, SC_ERROR_NOT_ALLOWED,          "Command not allowed"},
  { 0x6A89, SC_ERROR_FILE_ALREADY_EXISTS,  "Files exists"},
  { 0x6A8A, SC_ERROR_FILE_ALREADY_EXISTS,  "Application exists"},
  { 0x6F01, SC_ERROR_CARD_CMD_FAILED, "public key not complete"},
  { 0x6F02, SC_ERROR_CARD_CMD_FAILED, "data overflow"},
  { 0x6F03, SC_ERROR_CARD_CMD_FAILED, "invalid command sequence"},
  { 0x6F05, SC_ERROR_CARD_CMD_FAILED, "security environment invalid"},
  { 0x6F07, SC_ERROR_FILE_NOT_FOUND, "key part not found"},
  { 0x6F08, SC_ERROR_CARD_CMD_FAILED, "signature failed"},
  { 0x6F0A, SC_ERROR_INCORRECT_PARAMETERS, "key format does not match key length"},
  { 0x6F0B, SC_ERROR_INCORRECT_PARAMETERS, "length of key component inconsistent with algorithm"},
  { 0x6F81, SC_ERROR_CARD_CMD_FAILED, "system error"}
};

/* internal structure to save the current security environment */
typedef struct starcos_ex_data_st {
  int    sec_ops; /* the currently selected security operation,
       * i.e. SC_SEC_OPERATION_AUTHENTICATE etc. */
  unsigned long    fix_digestInfo;
  unsigned int    pin_encoding;
} starcos_ex_data;

/*
   This constant allows signing or
   decrypting with RSA keys up to 4096 bits.
*/
#define STARCOS3X_PROBE_APDU_LENGTH 512

#define PIN_ENCODING_DETERMINE  0
#define PIN_ENCODING_DEFAULT  SC_PIN_ENCODING_GLP

// known pin formats for StarCOS 3.x cards
#define PIN_FORMAT_F1     0x11
#define PIN_FORMAT_F2     0x12
#define PIN_FORMAT_RSA      0x1230
#define PIN_FORMAT_BCD      0x13
#define PIN_FORMAT_ASCII    0x14
#define PIN_FORMAT_PW_ASCII   0x21
// default is the Format 2 PIN Block which is GLP in OpenSC
#define PIN_FORMAT_DEFAULT    PIN_FORMAT_F2

#define CHECK_NOT_SUPPORTED_V3_4(card) \
  do { \
    if ((card)->type == SC_CARD_TYPE_STARCOS_V3_4) { \
      sc_log((card)->ctx,  \
        "not supported for STARCOS 3.4 cards"); \
      return SC_ERROR_NOT_SUPPORTED; \
    } \
  } while (0);

/* card type helpers */
#define IS_V34(card) card->type == SC_CARD_TYPE_STARCOS_V3_4 || card->type == SC_CARD_TYPE_STARCOS_V3_4_ESIGN
#define IS_V35(card) card->type == SC_CARD_TYPE_STARCOS_V3_5 || card->type == SC_CARD_TYPE_STARCOS_V3_5_ESIGN
#define IS_V3x(card) IS_V34(card) || IS_V35(card)

/* the starcos part */
static int starcos_match_card(sc_card_t *card)
{
  int i;

  i = _sc_match_atr(card, starcos_atrs, &card->type);
  if (i < 0)
    return 0;
  return 1;
}


typedef struct starcos_ctrl_ref_template_st {
  unsigned int  transmission_format;
#if 0
  // not relevant values for now
  unsigned int  se_reference;
  unsigned int  ssec_initial_value;
#endif
} starcos_ctrl_ref_template;

// tags
#define TAG_STARCOS35_PIN_REFERENCE         0x88
#define TAG_STARCOS3X_SUPPORTED_SEC_MECHANISMS_tag    0x7B
#define TAG_STARCOS3X_CTRL_REF_TEMPLATE       0xA4
#define TAG_STARCOS3X_TRANSMISSION_FORMAT     0x89

static const char * starcos_ef_pwdd = "3F000015";
static const char * starcos_ef_keyd = "3F000013";

/**
 * Parses supported security mechanisms record data.
 * It returns SC_SUCCESS and the ctrl_ref_template structure data on success
 */
static int starcos_parse_supported_sec_mechanisms(struct sc_card *card, const unsigned char * buf, size_t buflen, starcos_ctrl_ref_template * ctrl_ref_template)
{
  struct sc_context *ctx = card->ctx;
  const unsigned char *supported_sec_mechanisms_tag = NULL;
  size_t taglen;

  LOG_FUNC_CALLED(ctx);

  supported_sec_mechanisms_tag = sc_asn1_find_tag(ctx, buf, buflen, TAG_STARCOS3X_SUPPORTED_SEC_MECHANISMS_tag, &taglen);
  if (supported_sec_mechanisms_tag != NULL && taglen >= 1)   {
    const unsigned char *tx_fmt_tag = NULL;
    const unsigned char *ctrl_ref_template_tag = NULL;
    size_t supported_sec_mechanisms_taglen = taglen;

    // control-reference template is either included in the supported security mechanisms tag or it can be the CRT tag itself (EF.PWDD)
    ctrl_ref_template_tag = sc_asn1_find_tag(ctx, supported_sec_mechanisms_tag, taglen, TAG_STARCOS3X_CTRL_REF_TEMPLATE, &taglen);
    if ( ctrl_ref_template_tag == NULL || taglen == 0 ) {
      ctrl_ref_template_tag = supported_sec_mechanisms_tag;
      taglen = supported_sec_mechanisms_taglen;
    }

    tx_fmt_tag = sc_asn1_find_tag(ctx, ctrl_ref_template_tag, taglen, TAG_STARCOS3X_TRANSMISSION_FORMAT, &taglen);
    if ( tx_fmt_tag != NULL && taglen >= 1 ) {
      ctrl_ref_template->transmission_format = *(tx_fmt_tag + 0);
      LOG_FUNC_RETURN(ctx, SC_SUCCESS);
    }
  }

  LOG_FUNC_RETURN(ctx, SC_ERROR_TEMPLATE_NOT_FOUND);
}

static int starcos_determine_pin_format34(sc_card_t *card, unsigned int * pin_format)
{
  struct sc_context *ctx = card->ctx;
  struct sc_path path;
  struct sc_file *file;
  unsigned char buf[256];
  int rv;
  int retval = SC_SUCCESS;
  int rec_no=1;

  LOG_FUNC_CALLED(ctx);

  sc_format_path(starcos_ef_pwdd, &path);
  rv = sc_select_file(card, &path, &file);
  LOG_TEST_RET(ctx, rv, "Cannot select EF.PWDD file");

  if ( (rv = sc_read_record(card, rec_no, 0, buf, sizeof(buf), SC_RECORD_BY_REC_NR)) > 0 ) {
    starcos_ctrl_ref_template ctrl_ref_template;
    memset((void*)&ctrl_ref_template, 0, sizeof(ctrl_ref_template));
    rv = starcos_parse_supported_sec_mechanisms(card, buf, rv, &ctrl_ref_template);
    if ( rv == SC_SUCCESS ) {
      *pin_format = ctrl_ref_template.transmission_format;
      sc_log(ctx, "Determined StarCOS 3.4 PIN format: 0x%x", *pin_format);
    } else {
      sc_log(ctx, "Failed to parse record %d of EF.PWD, err=%d", rec_no, rv);
      retval = rv;
    }
  } else {
    sc_log(ctx, "Failed to read record %d of EF.PWDD, err=%d", rec_no, rv);
    retval = rv;
  }

  sc_file_free(file);
  LOG_FUNC_RETURN(ctx, retval);
}

static int starcos_determine_pin_format35(sc_card_t *card, unsigned int * pin_format)
{
  struct sc_context *ctx = card->ctx;
  struct sc_path path;
  struct sc_file *file;
  unsigned char buf[256];
  int rv;
  int retval = SC_ERROR_RECORD_NOT_FOUND;
  int rec_no=1;
  starcos_ctrl_ref_template ctrl_ref_template;

  LOG_FUNC_CALLED(ctx);

  sc_format_path(starcos_ef_keyd, &path);
  rv = sc_select_file(card, &path, &file);
  LOG_TEST_RET(ctx, rv, "Cannot select EF.KEYD file");

  while ( (rv = sc_read_record(card, rec_no++, 0, buf, sizeof(buf), SC_RECORD_BY_REC_NR)) > 0 ) {
    if ( buf[0] != TAG_STARCOS35_PIN_REFERENCE ) continue;

    memset((void*)&ctrl_ref_template, 0, sizeof(ctrl_ref_template));
    rv = starcos_parse_supported_sec_mechanisms(card, buf, rv, &ctrl_ref_template);
    if ( rv == SC_SUCCESS ) {
      *pin_format = ctrl_ref_template.transmission_format;
      sc_log(ctx, "Determined StarCOS 3.5 PIN format: 0x%x", *pin_format);
      retval = rv;
      // assuming that all PINs and PUKs have the same transmission format
      break;
    } else {
      sc_log(ctx, "Failed to parse record %d of EF.KEYD, err=%d", rec_no-1, rv);
      retval = rv;
    }
  }

  sc_file_free(file);
  LOG_FUNC_RETURN(ctx, retval);
}

/**
 * Determine v3.x PIN encoding by parsing either
 * EF.PWDD (for v3.4) or EF.KEYD (for v3.5)
 *
 * It returns an OpenSC PIN encoding, using the default value on failure
 */
static unsigned int starcos_determine_pin_encoding(sc_card_t *card)
{
  unsigned int pin_format = PIN_FORMAT_DEFAULT;
  unsigned int encoding = PIN_ENCODING_DETERMINE;

  if ( IS_V34(card) ) {
    starcos_determine_pin_format34(card, &pin_format);
  } else if ( IS_V35(card) ) {
    starcos_determine_pin_format35(card, &pin_format);
  }

  switch (pin_format) {
  case PIN_FORMAT_PW_ASCII:
  case PIN_FORMAT_ASCII:
    encoding = SC_PIN_ENCODING_ASCII;
    break;
  case PIN_FORMAT_BCD:
    encoding = SC_PIN_ENCODING_BCD;
    break;
  case PIN_FORMAT_F1:
  case PIN_FORMAT_F2:
    encoding = SC_PIN_ENCODING_GLP;
    break;
  }

  sc_log(card->ctx, "Determined PIN encoding: %d", encoding);
  return encoding;
}

/**
 * Returns 1 if an extended APDU can be sent to the card
 * with the given card reader. Otherwise returns 0.
 */
static int starcos_probe_reader_for_ext_apdu(sc_card_t * card) {
  sc_apdu_t apdu;
  int rv;
  /* try to read STARCOS3X_PROBE_APDU_LENGTH bytes */
  u8 data[STARCOS3X_PROBE_APDU_LENGTH];

  /* Get Data: Get Chip Serial Number */
  sc_format_apdu(card, &apdu, SC_APDU_CASE_2_EXT, 0xCA, 0x9F, 0x6C);
  apdu.cla = 0xA0;
  apdu.resp = data;
  apdu.resplen = sizeof(data);
  apdu.le = apdu.resplen;
  rv = sc_transmit_apdu(card, &apdu);
  LOG_TEST_RET(card->ctx, rv, "Failed to send Get Data ext. APDU");
  return (apdu.sw1 == 0x90 && apdu.sw2 == 0x00);
}

static int starcos_select_mf(sc_card_t * card) {
  sc_apdu_t apdu;
  const u8 mf_buf[2] = {0x3f, 0x00};

  sc_format_apdu(card, &apdu, SC_APDU_CASE_3_SHORT, 0xA4, 0x00, 0x0C);
  apdu.le = 0;
  apdu.lc = 2;
  apdu.data    = mf_buf;
  apdu.datalen = 2;
  apdu.resplen = 0;

  return sc_transmit_apdu(card, &apdu);
}

static int starcos_select_aid(sc_card_t *card,
            const u8 aid[16], size_t len,
            sc_file_t **file_out);

/* returns 1 if the card has the eSign app with AID A0:00:00:02:45:53:69:67:6E
   otherwise returns 0
 */
static int starcos_has_esign_app(sc_card_t * card) {
  static const char * starcos_esign_aid = "A0:00:00:02:45:53:69:67:6E";
  int rv;

  rv = starcos_select_mf(card);
  if ( rv == SC_SUCCESS ) {
    u8 aid[SC_MAX_PATH_SIZE];
    size_t len = sizeof(aid);

    rv = sc_hex_to_bin(starcos_esign_aid, aid, &len);
    LOG_TEST_RET(card->ctx, rv, "Failed to convert eSing AID");
    rv = starcos_select_aid(card, aid, len, NULL);
    if ( rv == SC_SUCCESS ) {
      starcos_select_mf(card);
    }
  }
  return ( rv == SC_SUCCESS );
}

static int starcos_init(sc_card_t *card)
{
  unsigned int flags;
  starcos_ex_data *ex_data;

  ex_data = calloc(1, sizeof(starcos_ex_data));
  if (ex_data == NULL)
    return SC_ERROR_OUT_OF_MEMORY;

  card->name = "STARCOS";
  card->cla  = 0x00;
  card->drv_data = (void *)ex_data;
  ex_data->pin_encoding = PIN_ENCODING_DETERMINE;

  flags = SC_ALGORITHM_RSA_PAD_PKCS1
    | SC_ALGORITHM_ONBOARD_KEY_GEN
    | SC_ALGORITHM_RSA_PAD_ISO9796
    | SC_ALGORITHM_RSA_HASH_NONE
    | SC_ALGORITHM_RSA_HASH_SHA1
    | SC_ALGORITHM_RSA_HASH_MD5
    | SC_ALGORITHM_RSA_HASH_RIPEMD160
    | SC_ALGORITHM_RSA_HASH_MD5_SHA1;

  card->caps = SC_CARD_CAP_RNG;

  if ( IS_V3x(card) ) {

    flags |= SC_CARD_FLAG_RNG
      | SC_ALGORITHM_RSA_HASH_SHA224
      | SC_ALGORITHM_RSA_HASH_SHA256
      | SC_ALGORITHM_RSA_HASH_SHA384
      | SC_ALGORITHM_RSA_HASH_SHA512
      | SC_ALGORITHM_RSA_PAD_PSS;

    _sc_card_add_rsa_alg(card, 512, flags, 0x10001);
    _sc_card_add_rsa_alg(card, 768, flags, 0x10001);
    _sc_card_add_rsa_alg(card,1024, flags, 0x10001);
    _sc_card_add_rsa_alg(card,1728, flags, 0x10001);
    _sc_card_add_rsa_alg(card,1976, flags, 0x10001);
    _sc_card_add_rsa_alg(card,2048, flags, 0x10001);
    if ( IS_V34(card) ) {
      card->name = "STARCOS 3.4";
      card->caps |= SC_CARD_CAP_ISO7816_PIN_INFO;
    } else {
      card->name = "STARCOS 3.5";
      _sc_card_add_rsa_alg(card,3072, flags, 0x10001);
    }
    card->max_send_size = 255;
    card->max_recv_size = 256;
  } else {
    _sc_card_add_rsa_alg(card, 512, flags, 0x10001);
    _sc_card_add_rsa_alg(card, 768, flags, 0x10001);
    _sc_card_add_rsa_alg(card,1024, flags, 0x10001);

    /* we need read_binary&friends with max 128 bytes per read */
    card->max_send_size = 128;
    card->max_recv_size = 128;
  }

  if (sc_parse_ef_atr(card) == SC_SUCCESS) {
    size_t max_recv_size = 0;
    size_t max_send_size = 0;

    /* Add max. length values from IAS/ECC specific issuer data */
    if ( card->ef_atr->issuer_data_len >= 4 ) {
      max_recv_size = bebytes2ushort(card->ef_atr->issuer_data);
      max_send_size = bebytes2ushort(card->ef_atr->issuer_data + 2);
    }
    /* which could be overridden with ISO7816 EF.ATR options, if present */
    if (card->ef_atr->max_response_apdu > 0) {
      max_recv_size = card->ef_atr->max_response_apdu;
    }
    if (card->ef_atr->max_command_apdu > 0) {
      max_send_size = card->ef_atr->max_command_apdu;
    }

    if ( max_send_size > 256 && max_recv_size > 256 ) {
      size_t max_recv_size_prev = card->max_recv_size;
      size_t max_send_size_prev = card->max_send_size;
      /* allow SC_CARD_CAP_APDU_EXT independent of ef_atr->caps, see IAS/ECC issuer data above */
      card->caps |= SC_CARD_CAP_APDU_EXT;
      /* the received data should not exceed max_recv_size including the sw1/sw2 */
      card->max_recv_size = max_recv_size - 2;
      /* the sent APDU should not exceed max_send_size including the 4 bytes of the APDU and 2 * 3 bytes Lc/Le */
      card->max_send_size = max_send_size - 10;
      /* probe reader for extended APDU support */
      if ( starcos_probe_reader_for_ext_apdu(card) ) {
        sc_log(card->ctx, "Successfully probed extended APDU, enabling extended APDU with max send/recv %d/%d",
          (int)card->max_send_size, (int)card->max_recv_size);
      } else {
        card->caps &= ~(SC_CARD_CAP_APDU_EXT);
        card->max_recv_size = max_recv_size_prev;
        card->max_send_size = max_send_size_prev;
        sc_log(card->ctx, "Ext APDU probing failed, the actual reader does not support ext APDU");
      }
    }
  }

  if ( ex_data->pin_encoding == PIN_ENCODING_DETERMINE ) {
    // about to determine PIN encoding
    ex_data->pin_encoding = starcos_determine_pin_encoding(card);
  }

  if ( card->type == SC_CARD_TYPE_STARCOS_V3_4 && starcos_has_esign_app(card) ) {
    card->type = SC_CARD_TYPE_STARCOS_V3_4_ESIGN;
    sc_log(card->ctx, "Card has eSign app, card type changed to %d", card->type);
  }

  return 0;
}

static int starcos_finish(sc_card_t *card)
{
  if (card->drv_data)
    free((starcos_ex_data *)card->drv_data);
  return 0;
}

static int process_fci(sc_context_t *ctx, sc_file_t *file,
           const u8 *buf, size_t buflen)
{
  /* NOTE: According to the Starcos S 2.1 manual it's possible
   *       that a SELECT DF returns as a FCI arbitrary data which
   *       is stored in a object file (in the corresponding DF)
   *       with the tag 0x6f.
   */

  size_t taglen, len = buflen;
  const u8 *tag = NULL, *p;

  sc_log(ctx,  "processing FCI bytes\n");

  if (buflen < 2)
    return SC_ERROR_INTERNAL;
  if (buf[0] != 0x6f)
    return SC_ERROR_INVALID_DATA;
  len = (size_t)buf[1];
  if (buflen - 2 < len)
    return SC_ERROR_INVALID_DATA;
  p = buf + 2;

  /* defaults */
  file->type = SC_FILE_TYPE_WORKING_EF;
  file->ef_structure = SC_FILE_EF_UNKNOWN;
  file->shareable = 0;
  file->record_length = 0;
  file->size = 0;

  tag = sc_asn1_find_tag(ctx, p, len, 0x80, &taglen);
  if (tag != NULL && taglen >= 2) {
    int bytes = (tag[0] << 8) + tag[1];
    sc_log(ctx,
      "  bytes in file: %d\n", bytes);
    file->size = bytes;
  }

  tag = sc_asn1_find_tag(ctx, p, len, 0x82, &taglen);
  if (tag != NULL) {
    const char *type = "unknown";
    const char *structure = "unknown";

    if (taglen == 1 && tag[0] == 0x01) {
      /* transparent EF */
      type = "working EF";
      structure = "transparent";
      file->type = SC_FILE_TYPE_WORKING_EF;
      file->ef_structure = SC_FILE_EF_TRANSPARENT;
    } else if (taglen == 1 && tag[0] == 0x11) {
      /* object EF */
      type = "working EF";
      structure = "object";
      file->type = SC_FILE_TYPE_WORKING_EF;
      file->ef_structure = SC_FILE_EF_TRANSPARENT; /* TODO */
    } else if (taglen == 3 && tag[1] == 0x21) {
      type = "working EF";
      file->record_length = tag[2];
      file->type = SC_FILE_TYPE_WORKING_EF;
      /* linear fixed, cyclic or compute */
      switch ( tag[0] )
      {
        case 0x02:
          structure = "linear fixed";
          file->ef_structure = SC_FILE_EF_LINEAR_FIXED;
          break;
        case 0x07:
          structure = "cyclic";
          file->ef_structure = SC_FILE_EF_CYCLIC;
          break;
        case 0x17:
          structure = "compute";
          file->ef_structure = SC_FILE_EF_UNKNOWN;
          break;
        default:
          structure = "unknown";
          file->ef_structure = SC_FILE_EF_UNKNOWN;
          file->record_length = 0;
          break;
      }
    }

    sc_log(ctx,
      "  type: %s\n", type);
    sc_log(ctx,
      "  EF structure: %s\n", structure);
  }
  file->magic = SC_FILE_MAGIC;

  return SC_SUCCESS;
}

static int process_fci_v3_4(sc_context_t *ctx, sc_file_t *file,
           const u8 *buf, size_t buflen)
{
  size_t taglen, len = buflen;
  const u8 *tag = NULL, *p;

  sc_log(ctx,
     "processing %"SC_FORMAT_LEN_SIZE_T"u FCI bytes\n", buflen);

  if (buflen < 2)
    return SC_ERROR_INTERNAL;
  if (buf[0] != 0x6f)
    return SC_ERROR_INVALID_DATA;
  len = (size_t)buf[1];
  if (buflen - 2 < len)
    return SC_ERROR_INVALID_DATA;

  /* defaults */
  file->type = SC_FILE_TYPE_WORKING_EF;
  if (len == 0) {
    SC_FUNC_RETURN(ctx, 2, SC_SUCCESS);
  }

  p = buf + 2;
  file->ef_structure = SC_FILE_TYPE_DF;
  file->shareable = 1;
  tag = sc_asn1_find_tag(ctx, p, len, 0x84, &taglen);
  if (tag != NULL && taglen > 0 && taglen <= 16) {
    memcpy(file->name, tag, taglen);
    file->namelen = taglen;
    sc_log(ctx,  "filename %s",
      sc_dump_hex(file->name, file->namelen));
  }
  return SC_SUCCESS;
}

static int process_fcp_v3_4(sc_context_t *ctx, sc_file_t *file,
           const u8 *buf, size_t buflen)
{
  size_t taglen, len = buflen;
  const u8 *tag = NULL, *p;

  sc_log(ctx,
     "processing %"SC_FORMAT_LEN_SIZE_T"u FCP bytes\n", buflen);

  if (buflen < 2)
    return SC_ERROR_INTERNAL;
  if (buf[0] != 0x62)
    return SC_ERROR_INVALID_DATA;
  len = (size_t)buf[1];
  if (buflen - 2 < len)
    return SC_ERROR_INVALID_DATA;
  p = buf + 2;

  tag = sc_asn1_find_tag(ctx, p, len, 0x80, &taglen);
  if (tag != NULL && taglen >= 2) {
    int bytes = (tag[0] << 8) + tag[1];
    sc_log(ctx,
      "  bytes in file: %d\n", bytes);
    file->size = bytes;
  }

  tag = sc_asn1_find_tag(ctx, p, len, 0xc5, &taglen);
  if (tag != NULL && taglen >= 2) {
    int bytes = (tag[0] << 8) + tag[1];
    sc_log(ctx,
      "  bytes in file 2: %d\n", bytes);
    file->size = bytes;
  }

  tag = sc_asn1_find_tag(ctx, p, len, 0x82, &taglen);
  if (tag != NULL) {
    const char *type = "unknown";
    const char *structure = "unknown";

    if (taglen >= 1) {
      unsigned char byte = tag[0];
      if (byte & 0x40) {
        file->shareable = 1;
      }
      if (byte == 0x38) {
        type = "DF";
        file->type = SC_FILE_TYPE_DF;
        file->shareable = 1;
      }
      switch (byte & 7) {
      case 1:
        /* transparent EF */
        type = "working EF";
        structure = "transparent";
        file->type = SC_FILE_TYPE_WORKING_EF;
        file->ef_structure = SC_FILE_EF_TRANSPARENT;
        break;
      case 2:
        /* linear fixed EF */
        type = "working EF";
        structure = "linear fixed";
        file->type = SC_FILE_TYPE_WORKING_EF;
        file->ef_structure = SC_FILE_EF_LINEAR_FIXED;
        break;
      case 4:
        /* linear variable EF */
        type = "working EF";
        structure = "linear variable";
        file->type = SC_FILE_TYPE_WORKING_EF;
        file->ef_structure = SC_FILE_EF_LINEAR_VARIABLE;
        break;
      case 6:
        /* cyclic EF */
        type = "working EF";
        structure = "cyclic";
        file->type = SC_FILE_TYPE_WORKING_EF;
        file->ef_structure = SC_FILE_EF_CYCLIC;
        break;
      default:
        /* use defaults from above */
        break;
      }
    }
    sc_log(ctx,
      "  type: %s\n", type);
    sc_log(ctx,
      "  EF structure: %s\n", structure);
    if (taglen >= 2) {
      if (tag[1] != 0x41 || taglen != 5) {
        SC_FUNC_RETURN(ctx, 2,SC_ERROR_INVALID_DATA);
      }
      /* formatted EF */
      file->record_length = (tag[2] << 8) + tag[3];
      file->record_count = tag[4];
      sc_log(ctx,
        "  rec_len: %"SC_FORMAT_LEN_SIZE_T"u  rec_cnt: %"SC_FORMAT_LEN_SIZE_T"u\n\n",
        file->record_length, file->record_count);
    }
  }

  tag = sc_asn1_find_tag(ctx, p, len, 0x83, &taglen);
  if (tag != NULL && taglen >= 2) {
    file->id = (tag[0] << 8) | tag[1];
    sc_log(ctx,  "  file identifier: 0x%02X%02X\n",
      tag[0], tag[1]);
  }

  tag = sc_asn1_find_tag(ctx, p, len, 0x84, &taglen);
  if (tag != NULL && taglen > 0 && taglen <= 16) {
    memcpy(file->name, tag, taglen);
    file->namelen = taglen;
    sc_log(ctx,  "  filename %s",
      sc_dump_hex(file->name, file->namelen));
  }

  tag = sc_asn1_find_tag(ctx, p, len, 0x8a, &taglen);
  if (tag != NULL && taglen == 1) {
    char* status = "unknown";
    switch (tag[0]) {
    case 1:
      status = "creation";
      file->status = SC_FILE_STATUS_CREATION;
      break;
    case 5:
      status = "operational active";
      file->status = SC_FILE_STATUS_ACTIVATED;
      break;
    case 12:
    case 13:
      status = "creation";
      file->status = SC_FILE_STATUS_INVALIDATED;
      break;
    default:
      break;
    }
    sc_log(ctx,  "  file status: %s\n", status);
  }

  file->magic = SC_FILE_MAGIC;
  return SC_SUCCESS;
}

static int starcos_select_aid(sc_card_t *card,
            const u8 aid[16], size_t len,
            sc_file_t **file_out)
{
  sc_apdu_t apdu;
  int r;
  size_t i = 0;

  sc_format_apdu(card, &apdu, SC_APDU_CASE_3_SHORT, 0xA4, 0x04, 0x0C);
  apdu.lc = len;
  apdu.data = (u8*)aid;
  apdu.datalen = len;
  apdu.resplen = 0;
  apdu.le = 0;
  r = sc_transmit_apdu(card, &apdu);
  LOG_TEST_RET(card->ctx, r, "APDU transmit failed");

  /* check return value */
  if (!(apdu.sw1 == 0x90 && apdu.sw2 == 0x00) && apdu.sw1 != 0x61 )
    SC_FUNC_RETURN(card->ctx, SC_LOG_DEBUG_VERBOSE, sc_check_sw(card, apdu.sw1, apdu.sw2));

  if (file_out) {
    sc_file_t *file = sc_file_new();
    if (!file)
      LOG_FUNC_RETURN(card->ctx, SC_ERROR_OUT_OF_MEMORY);
    file->type = SC_FILE_TYPE_DF;
    file->ef_structure = SC_FILE_EF_UNKNOWN;
    file->path.len = 0;
    file->size = 0;
    /* AID */
    for (i = 0; i < len; i++)
      file->name[i] = aid[i];
    file->namelen = len;
    file->id = 0x0000;
    file->magic = SC_FILE_MAGIC;

    *file_out = file;
  }
  SC_FUNC_RETURN(card->ctx, SC_LOG_DEBUG_VERBOSE, SC_SUCCESS);
}

static int starcos_select_fid(sc_card_t *card,
            unsigned int id_hi, unsigned int id_lo,
            sc_file_t **file_out, int is_file)
{
  sc_apdu_t apdu;
  u8 data[] = {id_hi & 0xff, id_lo & 0xff};
  u8 resp[SC_MAX_APDU_BUFFER_SIZE];
  int bIsDF = 0, r;
  int isFCP = 0;
  int isMF = 0;

  /* request FCI to distinguish between EFs and DFs */
  sc_format_apdu(card, &apdu, SC_APDU_CASE_4_SHORT, 0xA4, 0x00, 0x00);
  apdu.p2   = 0x00;
  apdu.resp = (u8*)resp;
  apdu.resplen = SC_MAX_APDU_BUFFER_SIZE;
  apdu.le = 256;
  apdu.lc = 2;
  apdu.data = (u8*)data;
  apdu.datalen = 2;

  if ( IS_V3x(card) ) {
    if (id_hi == 0x3f && id_lo == 0x0) {
      apdu.p1 = 0x0;
      apdu.p2 = 0x0C;
      apdu.le = 0;
      apdu.resplen = 0;
      apdu.resp = NULL;
      apdu.cse = SC_APDU_CASE_3_SHORT;
      isMF = 1;
    } else if (file_out || is_file) {
      // last component (i.e. file or path)
      apdu.p1 = 0x2;
      apdu.p2 = 0x4;
    } else {
      // path component
      apdu.p1 = 0x1;
      apdu.p2 = 0x0;
    }
  }

  r = sc_transmit_apdu(card, &apdu);
  LOG_TEST_RET(card->ctx, r, "APDU transmit failed");

  if (apdu.p2 == 0x00 && apdu.sw1 == 0x62 && apdu.sw2 == 0x84 ) {
    /* no FCI => we have a DF (see comment in process_fci()) */
    bIsDF = 1;
    apdu.p2 = 0x0C;
    apdu.cse = SC_APDU_CASE_3_SHORT;
    apdu.resplen = 0;
    apdu.le = 0;
    r = sc_transmit_apdu(card, &apdu);
    LOG_TEST_RET(card->ctx, r, "APDU re-transmit failed");
  } else if ((IS_V3x(card))
      && apdu.p2 == 0x4 && apdu.sw1 == 0x6a && apdu.sw2 == 0x82) {
    /* not a file, could be a path */
    bIsDF = 1;
    apdu.p1 = 0x1;
    apdu.p2 = 0x0;
    apdu.resplen = sizeof(resp);
    apdu.le = 256;
    apdu.lc = 2;
    r = sc_transmit_apdu(card, &apdu);
    LOG_TEST_RET(card->ctx, r, "APDU re-transmit failed");
  } else if (apdu.sw1 == 0x61 || (apdu.sw1 == 0x90 && apdu.sw2 == 0x00 && !isMF)) {
    /* SELECT returned some data (possible FCI) =>
     * try a READ BINARY to see if a EF is selected */
    sc_apdu_t apdu2;
    u8 resp2[2];
    sc_format_apdu(card, &apdu2, SC_APDU_CASE_2_SHORT, 0xB0, 0, 0);
    apdu2.resp = (u8*)resp2;
    apdu2.resplen = 2;
    apdu2.le = 1;
    apdu2.lc = 0;
    r = sc_transmit_apdu(card, &apdu2);
    LOG_TEST_RET(card->ctx, r, "APDU transmit failed");
    if (apdu2.sw1 == 0x69 && apdu2.sw2 == 0x86) {
      /* no current EF is selected => we have a DF */
      bIsDF = 1;
    } else {
      isFCP = 1;
    }
  }

  if (apdu.sw1 != 0x61 && (apdu.sw1 != 0x90 || apdu.sw2 != 0x00))
    SC_FUNC_RETURN(card->ctx, SC_LOG_DEBUG_VERBOSE, sc_check_sw(card, apdu.sw1, apdu.sw2));

  if (file_out) {
    sc_file_t *file = sc_file_new();
    if (!file)
      LOG_FUNC_RETURN(card->ctx, SC_ERROR_OUT_OF_MEMORY);
    file->id = (id_hi << 8) + id_lo;

    if (bIsDF || isMF) {
      /* we have a DF */
      file->type = SC_FILE_TYPE_DF;
      file->ef_structure = SC_FILE_EF_UNKNOWN;
      file->size = 0;
      file->namelen = 0;
      file->magic = SC_FILE_MAGIC;
      *file_out = file;
    } else {
      /* ok, assume we have a EF */
      if ( IS_V3x(card) ) {
        if (isFCP) {
          r = process_fcp_v3_4(card->ctx, file, apdu.resp,
              apdu.resplen);
        } else {
          r = process_fci_v3_4(card->ctx, file, apdu.resp,
              apdu.resplen);
        }
      } else {
        r = process_fci(card->ctx, file, apdu.resp,
            apdu.resplen);
      }
      if (r != SC_SUCCESS) {
        sc_file_free(file);
        return r;
      }

      *file_out = file;
    }
  }

  SC_FUNC_RETURN(card->ctx, SC_LOG_DEBUG_VERBOSE, SC_SUCCESS);
}

static int starcos_select_file(sc_card_t *card,
             const sc_path_t *in_path,
             sc_file_t **file_out)
{
  u8 pathbuf[SC_MAX_PATH_SIZE], *path = pathbuf;
  int    r, pathtype;
  size_t i, pathlen;

  SC_FUNC_CALLED(card->ctx, SC_LOG_DEBUG_VERBOSE);

  if ( in_path->len > sizeof(pathbuf) ) {
    SC_FUNC_RETURN(card->ctx, SC_LOG_DEBUG_VERBOSE, SC_ERROR_BUFFER_TOO_SMALL);
  }
  memcpy(path, in_path->value, in_path->len);
  pathlen = in_path->len;
  pathtype = in_path->type;

  if (in_path->aid.len) {
    if (!pathlen) {
      if ( in_path->aid.len > sizeof(pathbuf) ) {
        SC_FUNC_RETURN(card->ctx, SC_LOG_DEBUG_VERBOSE, SC_ERROR_BUFFER_TOO_SMALL);
      }
      memcpy(path, in_path->aid.value, in_path->aid.len);
      pathlen = in_path->aid.len;
      pathtype = SC_PATH_TYPE_DF_NAME;
    } else {
      r = starcos_select_aid(card, in_path->aid.value, in_path->aid.len, NULL);
      LOG_TEST_RET(card->ctx, r, "Could not select AID!");

      if (pathtype == SC_PATH_TYPE_DF_NAME) {
        pathtype = SC_PATH_TYPE_FILE_ID;
      }
    }
  }

  if (pathtype == SC_PATH_TYPE_FILE_ID)
  { /* SELECT EF/DF with ID */
    /* Select with 2byte File-ID */
    if (pathlen != 2)
      SC_FUNC_RETURN(card->ctx, SC_LOG_DEBUG_VERBOSE,SC_ERROR_INVALID_ARGUMENTS);
    r = starcos_select_fid(card, path[0],
        path[1], path[0] == 0x3F && path[1] == 0x00 ? NULL : file_out, 1);
    SC_FUNC_RETURN(card->ctx, SC_LOG_DEBUG_VERBOSE, r);
  }
  else if (pathtype == SC_PATH_TYPE_DF_NAME)
  { /* SELECT DF with AID */
    /* Select with 1-16byte Application-ID */
    r = starcos_select_aid(card, pathbuf, pathlen, file_out);
    SC_FUNC_RETURN(card->ctx, SC_LOG_DEBUG_VERBOSE, r);
  }
  else if (pathtype == SC_PATH_TYPE_PATH)
  {
    u8 n_pathbuf[SC_MAX_PATH_SIZE];

    /* Select with path (sequence of File-IDs) */
    /* Starcos (S 2.1 and SPK 2.3) only supports one
     * level of subdirectories, therefore a path is
     * at most 3 FID long (the last one being the FID
     * of a EF) => pathlen must be even and less than 6
     */
    if (pathlen%2 != 0 || pathlen > 6 || pathlen <= 0)
      SC_FUNC_RETURN(card->ctx, SC_LOG_DEBUG_VERBOSE, SC_ERROR_INVALID_ARGUMENTS);
    /* if pathlen == 6 then the first FID must be MF (== 3F00) */
    if (pathlen == 6 && ( path[0] != 0x3f || path[1] != 0x00 ))
      SC_FUNC_RETURN(card->ctx, SC_LOG_DEBUG_VERBOSE, SC_ERROR_INVALID_ARGUMENTS);

    if ( IS_V3x(card) ) {
      /* unify path (the first FID should be MF) */
      if (path[0] != 0x3f || path[1] != 0x00)
      {
        n_pathbuf[0] = 0x3f;
        n_pathbuf[1] = 0x00;
        memcpy(n_pathbuf+2, path, pathlen);
        path = n_pathbuf;
        pathlen += 2;
      }
    }

    for ( i=0; i<pathlen-2; i+=2 )
    {
      r = starcos_select_fid(card, path[i], path[i+1], NULL, 0);
      LOG_TEST_RET(card->ctx, r, "SELECT FILE (DF-ID) failed");
    }
    r = starcos_select_fid(card, path[pathlen-2], path[pathlen-1], file_out, 1);
    SC_FUNC_RETURN(card->ctx, SC_LOG_DEBUG_VERBOSE, r);
  }
  else
    SC_FUNC_RETURN(card->ctx, SC_LOG_DEBUG_VERBOSE, SC_ERROR_INVALID_ARGUMENTS);
}

static int starcos_get_challenge(struct sc_card *card, unsigned char *rnd, size_t len)
{
  LOG_FUNC_CALLED(card->ctx);

  if (len > 8) {
    len = 8;
  }

  LOG_FUNC_RETURN(card->ctx, iso_ops->get_challenge(card, rnd, len));
}

#define STARCOS_AC_ALWAYS 0x9f
#define STARCOS_AC_NEVER  0x5f
#define STARCOS_PINID2STATE(a)  ((((a) & 0x0f) == 0x01) ? ((a) & 0x0f) : (0x0f - ((0x0f & (a)) >> 1)))

static u8 process_acl_entry(sc_file_t *in, unsigned int method, unsigned int in_def)
{
  u8 def = (u8)in_def;
  const sc_acl_entry_t *entry = sc_file_get_acl_entry(in, method);
  if (!entry)
    return def;
  else if (entry->method & SC_AC_CHV) {
    unsigned int key_ref = entry->key_ref;
    if (key_ref == SC_AC_KEY_REF_NONE)
      return def;
    else if ((key_ref & 0x0f) == 1)
      /* SOPIN */
      return (key_ref & 0x80 ? 0x10 : 0x00) | 0x01;
    else
      return (key_ref & 0x80 ? 0x10 : 0x00) | STARCOS_PINID2STATE(key_ref);
  } else if (entry->method & SC_AC_NEVER)
    return STARCOS_AC_NEVER;
  else
    return def;
}

/** starcos_process_acl
 * \param card pointer to the sc_card object
 * \param file pointer to the sc_file object
 * \param data pointer to a sc_starcos_create_data structure
 * \return SC_SUCCESS if no error occurred otherwise error code
 *
 * This function tries to create a somewhat usable Starcos spk 2.3 acl
 * from the OpenSC internal acl (storing the result in the supplied
 * sc_starcos_create_data structure).
 */
static int starcos_process_acl(sc_card_t *card, sc_file_t *file,
  sc_starcos_create_data *data)
{
  u8     tmp, *p;
  static const u8 def_key[] = {0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08};

  if (file->type == SC_FILE_TYPE_DF && file->id == 0x3f00) {
    p    = data->data.mf.header;
    memcpy(p, def_key, 8);
    p   += 8;
    *p++ = (file->size >> 8) & 0xff;
    *p++ = file->size & 0xff;
    /* guess isf size (mf_size / 4) */
    *p++ = (file->size >> 10) & 0xff;
    *p++ = (file->size >> 2)  & 0xff;
    /* ac create ef  */
    *p++ = process_acl_entry(file,SC_AC_OP_CREATE,STARCOS_AC_ALWAYS);
    /* ac create key */
    *p++ = process_acl_entry(file,SC_AC_OP_CREATE,STARCOS_AC_ALWAYS);
    /* ac create df  */
    *p++ = process_acl_entry(file,SC_AC_OP_CREATE,STARCOS_AC_ALWAYS);
    /* use the same ac for register df and create df */
    *p++ = data->data.mf.header[14];
    /* if sm is required use combined mode */
    if (file->acl[SC_AC_OP_CREATE] && (sc_file_get_acl_entry(file, SC_AC_OP_CREATE))->method & SC_AC_PRO)
      tmp = 0x03; /* combined mode */
    else
      tmp = 0x00; /* no sm */
    *p++ = tmp; /* use the same sm mode for all ops */
    *p++ = tmp;
    *p = tmp;
    data->type = SC_STARCOS_MF_DATA;

    return SC_SUCCESS;
  } else if (file->type == SC_FILE_TYPE_DF){
    p    = data->data.df.header;
    *p++ = (file->id >> 8) & 0xff;
    *p++ = file->id & 0xff;
    if (file->namelen) {
      /* copy aid */
      *p++ = file->namelen & 0xff;
      memset(p, 0, 16);
      memcpy(p, file->name, (u8)file->namelen);
      p   += 16;
    } else {
      /* use the fid as aid */
      *p++ = 2;
      memset(p, 0, 16);
      *p++ = (file->id >> 8) & 0xff;
      *p++ = file->id & 0xff;
      p   += 14;
    }
    /* guess isf size */
    *p++ = (file->size >> 10) & 0xff; /* ISF space */
    *p++ = (file->size >> 2)  & 0xff; /* ISF space */
    /* ac create ef  */
    *p++ = process_acl_entry(file,SC_AC_OP_CREATE,STARCOS_AC_ALWAYS);
    /* ac create key */
    *p++ = process_acl_entry(file,SC_AC_OP_CREATE,STARCOS_AC_ALWAYS);
    /* set sm byte (same for keys and ef) */
    if (file->acl[SC_AC_OP_CREATE] &&
        (sc_file_get_acl_entry(file, SC_AC_OP_CREATE)->method &
         SC_AC_PRO))
      tmp = 0x03;
    else
      tmp = 0x00;
    *p++ = tmp; /* SM CR  */
    *p = tmp; /* SM ISF */

    data->data.df.size[0] = (file->size >> 8) & 0xff;
    data->data.df.size[1] = file->size & 0xff;
    data->type = SC_STARCOS_DF_DATA;

    return SC_SUCCESS;
  } else if (file->type == SC_FILE_TYPE_WORKING_EF) {
    p    = data->data.ef.header;
    *p++ = (file->id >> 8) & 0xff;
    *p++ = file->id & 0xff;
    /* ac read  */
    *p++ = process_acl_entry(file, SC_AC_OP_READ,STARCOS_AC_ALWAYS);
    /* ac write */
    *p++ = process_acl_entry(file, SC_AC_OP_WRITE,STARCOS_AC_ALWAYS);
    /* ac erase */
    *p++ = process_acl_entry(file, SC_AC_OP_ERASE,STARCOS_AC_ALWAYS);
    *p++ = STARCOS_AC_ALWAYS; /* AC LOCK     */
    *p++ = STARCOS_AC_ALWAYS; /* AC UNLOCK   */
    *p++ = STARCOS_AC_ALWAYS; /* AC INCREASE */
    *p++ = STARCOS_AC_ALWAYS; /* AC DECREASE */
    *p++ = 0x00;      /* rfu         */
    *p++ = 0x00;      /* rfu         */
    /* use sm (in combined mode) if wanted */
    if ((file->acl[SC_AC_OP_READ]   && (sc_file_get_acl_entry(file, SC_AC_OP_READ)->method & SC_AC_PRO)) ||
        (file->acl[SC_AC_OP_UPDATE] && (sc_file_get_acl_entry(file, SC_AC_OP_UPDATE)->method & SC_AC_PRO)) ||
        (file->acl[SC_AC_OP_WRITE]  && (sc_file_get_acl_entry(file, SC_AC_OP_WRITE)->method & SC_AC_PRO)) )
      tmp = 0x03;
    else
      tmp = 0x00;
    *p++ = tmp;     /* SM byte     */
    *p++ = 0x00;      /* use the least significant 5 bits
             * of the FID as SID */
    switch (file->ef_structure)
    {
    case SC_FILE_EF_TRANSPARENT:
      *p++ = 0x81;
      *p++ = (file->size >> 8) & 0xff;
      *p = file->size & 0xff;
      break;
    case SC_FILE_EF_LINEAR_FIXED:
      *p++ = 0x82;
      *p++ = file->record_count  & 0xff;
      *p = file->record_length & 0xff;
      break;
    case SC_FILE_EF_CYCLIC:
      *p++ = 0x84;
      *p++ = file->record_count  & 0xff;
      *p = file->record_length & 0xff;
      break;
    default:
      return SC_ERROR_INVALID_ARGUMENTS;
    }
    data->type = SC_STARCOS_EF_DATA;

    return SC_SUCCESS;
  } else
                return SC_ERROR_INVALID_ARGUMENTS;
}

/** starcos_create_mf
 * internal function to create the MF
 * \param card pointer to the sc_card structure
 * \param data pointer to a sc_starcos_create_data object
 * \return SC_SUCCESS or error code
 *
 * This function creates the MF based on the information stored
 * in the sc_starcos_create_data.mf structure. Note: CREATE END must be
 * called separately to activate the ACs.
 */
static int starcos_create_mf(sc_card_t *card, sc_starcos_create_data *data)
{
  int    r;
  sc_apdu_t       apdu;
  sc_context_t   *ctx = card->ctx;

  CHECK_NOT_SUPPORTED_V3_4(card);

  sc_log(ctx,  "creating MF \n");
  sc_format_apdu(card, &apdu, SC_APDU_CASE_3_SHORT, 0xE0, 0x00, 0x00);
  apdu.cla |= 0x80;
  apdu.lc   = 19;
  apdu.datalen = 19;
  apdu.data = (u8 *) data->data.mf.header;

  r = sc_transmit_apdu(card, &apdu);
  LOG_TEST_RET(ctx, r, "APDU transmit failed");
  return sc_check_sw(card, apdu.sw1, apdu.sw2);
}

/** starcos_create_df
 * internal function to create a DF
 * \param card pointer to the sc_card structure
 * \param data pointer to a sc_starcos_create_data object
 * \return SC_SUCCESS or error code
 *
 * This functions registers and creates a DF based in the information
 * stored in a sc_starcos_create_data.df data structure. Note: CREATE END must
 * be called separately to activate the ACs.
 */
static int starcos_create_df(sc_card_t *card, sc_starcos_create_data *data)
{
  int    r;
  size_t len;
  sc_apdu_t       apdu;
  sc_context_t   *ctx = card->ctx;

  CHECK_NOT_SUPPORTED_V3_4(card);

  sc_log(ctx,  "creating DF\n");
  /* first step: REGISTER DF */
  sc_log(ctx,  "calling REGISTER DF\n");

  sc_format_apdu(card, &apdu, SC_APDU_CASE_3_SHORT, 0x52,
           data->data.df.size[0], data->data.df.size[1]);
  len  = 3 + data->data.df.header[2];
  apdu.cla |= 0x80;
  apdu.lc   = len;
  apdu.datalen = len;
  apdu.data = data->data.df.header;

  r = sc_transmit_apdu(card, &apdu);
  LOG_TEST_RET(ctx, r, "APDU transmit failed");
  /* second step: CREATE DF */
  sc_log(ctx,  "calling CREATE DF\n");

  sc_format_apdu(card, &apdu, SC_APDU_CASE_3_SHORT, 0xE0, 0x01, 0x00);
  apdu.cla |= 0x80;
  apdu.lc   = 25;
  apdu.datalen = 25;
  apdu.data = data->data.df.header;

  r = sc_transmit_apdu(card, &apdu);
  LOG_TEST_RET(ctx, r, "APDU transmit failed");
  return sc_check_sw(card, apdu.sw1, apdu.sw2);
}

/** starcos_create_ef
 * internal function to create a EF
 * \param card pointer to the sc_card structure
 * \param data pointer to a sc_starcos_create_data object
 * \return SC_SUCCESS or error code
 *
 * This function creates a EF based on the information stored in
 * the sc_starcos_create_data.ef data structure.
 */
static int starcos_create_ef(sc_card_t *card, sc_starcos_create_data *data)
{
  int    r;
  sc_apdu_t       apdu;
  sc_context_t   *ctx = card->ctx;

  CHECK_NOT_SUPPORTED_V3_4(card);

  sc_log(ctx,  "creating EF\n");

  sc_format_apdu(card,&apdu,SC_APDU_CASE_3_SHORT,0xE0,0x03,0x00);
  apdu.cla |= 0x80;
  apdu.lc   = 16;
  apdu.datalen = 16;
  apdu.data = (u8 *) data->data.ef.header;

  r = sc_transmit_apdu(card, &apdu);
  LOG_TEST_RET(card->ctx, r, "APDU transmit failed");
  return sc_check_sw(card, apdu.sw1, apdu.sw2);
}

/** starcos_create_end
 * internal function to activate the ACs
 * \param card pointer to the sc_card structure
 * \param file pointer to a sc_file object
 * \return SC_SUCCESS or error code
 *
 * This function finishes the creation of a DF (or MF) and activates
 * the ACs.
 */
static int starcos_create_end(sc_card_t *card, sc_file_t *file)
{
  int r;
  u8  fid[2];
  sc_apdu_t       apdu;

  if (file->type != SC_FILE_TYPE_DF)
    return SC_ERROR_INVALID_ARGUMENTS;

  CHECK_NOT_SUPPORTED_V3_4(card);

  fid[0] = (file->id >> 8) & 0xff;
  fid[1] = file->id & 0xff;
  sc_format_apdu(card,&apdu,SC_APDU_CASE_3_SHORT, 0xE0, 0x02, 0x00);
  apdu.cla |= 0x80;
  apdu.lc   = 2;
  apdu.datalen = 2;
  apdu.data = fid;
  r = sc_transmit_apdu(card, &apdu);
  LOG_TEST_RET(card->ctx, r, "APDU transmit failed");
  return sc_check_sw(card, apdu.sw1, apdu.sw2);
}

/** starcos_create_file
 * \param card pointer to the sc_card structure
 * \param file pointer to a sc_file object
 * \return SC_SUCCESS or error code
 *
 * This function creates MF, DF or EF based on the supplied
 * information in the sc_file structure (using starcos_process_acl).
 */
static int starcos_create_file(sc_card_t *card, sc_file_t *file)
{
  int    r;
  sc_starcos_create_data data;

  CHECK_NOT_SUPPORTED_V3_4(card);

  SC_FUNC_CALLED(card->ctx, SC_LOG_DEBUG_VERBOSE);

  if (file->type == SC_FILE_TYPE_DF) {
    if (file->id == 0x3f00) {
      /* CREATE MF */
      r = starcos_process_acl(card, file, &data);
      if (r != SC_SUCCESS)
        return r;
      return starcos_create_mf(card, &data);
    } else {
      /* CREATE DF */
      r = starcos_process_acl(card, file, &data);
      if (r != SC_SUCCESS)
        return r;
      return starcos_create_df(card, &data);
    }
  } else if (file->type == SC_FILE_TYPE_WORKING_EF) {
    /* CREATE EF */
    r = starcos_process_acl(card, file, &data);
    if (r != SC_SUCCESS)
      return r;
    return starcos_create_ef(card, &data);
  } else
    return SC_ERROR_INVALID_ARGUMENTS;
}

/** starcos_erase_card
 * internal function to restore the delivery state
 * \param card pointer to the sc_card object
 * \return SC_SUCCESS or error code
 *
 * This function deletes the MF (for 'test cards' only).
 */
static int starcos_erase_card(sc_card_t *card)
{ /* restore the delivery state */
  int r;
  u8  sbuf[2];
  sc_apdu_t apdu = {0};

  sbuf[0] = 0x3f;
  sbuf[1] = 0x00;
  sc_format_apdu(card, &apdu, SC_APDU_CASE_3_SHORT, 0xE4, 0x00, 0x00);
  apdu.cla |= 0x80;
  apdu.lc   = 2;
  apdu.datalen = 2;
  apdu.data = sbuf;

  r = sc_transmit_apdu(card, &apdu);
  LOG_TEST_RET(card->ctx, r, "APDU transmit failed");
  if (apdu.sw1 == 0x69 && apdu.sw2 == 0x85)
    /* no MF to delete, ignore error */
    return SC_SUCCESS;
  else return sc_check_sw(card, apdu.sw1, apdu.sw2);
}

#define STARCOS_WKEY_CSIZE  124

/** starcos_write_key
 * set key in isf
 * \param card pointer to the sc_card object
 * \param data pointer to a sc_starcos_wkey_data structure
 * \return SC_SUCCESS or error code
 *
 * This function installs a key header in the ISF (based on the
 * information supplied in the sc_starcos_wkey_data structure)
 * and set a supplied key (depending on the mode).
 */
static int starcos_write_key(sc_card_t *card, sc_starcos_wkey_data *data)
{
  int       r;
  u8        sbuf[SC_MAX_APDU_BUFFER_SIZE];
  const u8 *p;
  size_t    len = sizeof(sbuf), tlen, offset = 0;
  sc_apdu_t       apdu;

  CHECK_NOT_SUPPORTED_V3_4(card);

  if (data->mode == 0) { /* mode == 0 => install */
    /* install key header */
    sbuf[0] = 0xc1; /* key header tag    */
    sbuf[1] = 0x0c; /* key header length */
    memcpy(sbuf + 2, data->key_header, 12);
    sc_format_apdu(card, &apdu, SC_APDU_CASE_3_SHORT, 0xf4,
             data->mode, 0x00);
    apdu.cla |= 0x80;
    apdu.lc   = 14;
    apdu.datalen = 14;
    apdu.data = sbuf;

    r = sc_transmit_apdu(card, &apdu);
    LOG_TEST_RET(card->ctx, r, "APDU transmit failed");
    if (apdu.sw1 != 0x90 || apdu.sw2 != 0x00)
      return sc_check_sw(card, apdu.sw1, apdu.sw2);
    if (data->key == NULL)
      return SC_SUCCESS;
  }

  if (data->key == NULL)
    return SC_ERROR_INVALID_ARGUMENTS;

  p    = data->key;
  tlen = data->key_len;
  while (tlen != 0) {
    /* transmit the key in chunks of STARCOS_WKEY_CSIZE bytes */
    u8 c_len = tlen < STARCOS_WKEY_CSIZE ? tlen : STARCOS_WKEY_CSIZE;
    sbuf[0] = 0xc2;
    sbuf[1] = 3 + c_len;
    sbuf[2] = data->kid;
    sbuf[3] = (offset >> 8) & 0xff;
    sbuf[4] = offset & 0xff;
    memcpy(sbuf+5, p, c_len);
    len = 5 + c_len;
    sc_format_apdu(card, &apdu, SC_APDU_CASE_3_SHORT, 0xf4, data->mode, 0x00);
    apdu.cla    |= 0x80;
    apdu.lc      = len;
    apdu.datalen = len;
    apdu.data    = sbuf;

    r = sc_transmit_apdu(card, &apdu);
    LOG_TEST_RET(card->ctx, r, "APDU transmit failed");
    if (apdu.sw1 != 0x90 || apdu.sw2 != 0x00)
      return sc_check_sw(card, apdu.sw1, apdu.sw2);
    offset += c_len;
    p      += c_len;
    tlen   -= c_len;
  }
  return SC_SUCCESS;
}

/** starcos_gen_key
 * generate public key pair
 * \param card pointer to the sc_card object
 * \param data pointer to a sc_starcos_gen_key_data structure
 * \return SC_SUCCESS or error code
 *
 * This function generates a public key pair and stores the created
 * private key in the ISF (specified by the KID).
 */
static int starcos_gen_key(sc_card_t *card, sc_starcos_gen_key_data *data)
{
  int r;
  size_t  i, len = data->key_length >> 3;
  sc_apdu_t apdu;
  u8 rbuf[SC_MAX_APDU_BUFFER_SIZE];
  u8 sbuf[2], *p, *q;

  CHECK_NOT_SUPPORTED_V3_4(card);

  /* generate key */
  sc_format_apdu(card, &apdu, SC_APDU_CASE_3_SHORT, 0x46,  0x00,
      data->key_id);
  apdu.le      = 0;
  sbuf[0] = (u8)(data->key_length >> 8);
  sbuf[1] = (u8)(data->key_length);
  apdu.data    = sbuf;
  apdu.lc      = 2;
  apdu.datalen = 2;
  r = sc_transmit_apdu(card, &apdu);
  LOG_TEST_RET(card->ctx, r, "APDU transmit failed");
  if (apdu.sw1 != 0x90 || apdu.sw2 != 0x00)
    return sc_check_sw(card, apdu.sw1, apdu.sw2);
  /* read public key via READ PUBLIC KEY */
  sc_format_apdu(card, &apdu, SC_APDU_CASE_4_SHORT, 0xf0,  0x9c, 0x00);
  sbuf[0]      = data->key_id;
  apdu.cla    |= 0x80;
  apdu.data    = sbuf;
  apdu.datalen = 1;
  apdu.lc      = 1;
  apdu.resp    = rbuf;
  apdu.resplen = sizeof(rbuf);
  apdu.le      = 256;
  r = sc_transmit_apdu(card, &apdu);
  LOG_TEST_RET(card->ctx, r, "APDU transmit failed");
  if (apdu.sw1 != 0x90 || apdu.sw2 != 0x00)
    return sc_check_sw(card, apdu.sw1, apdu.sw2);

  data->modulus = malloc(len);
  if (!data->modulus)
    return SC_ERROR_OUT_OF_MEMORY;
  p = data->modulus;
  /* XXX use tags to find starting position of the modulus */
  q = &rbuf[18];
  /* LSB to MSB -> MSB to LSB */
  for (i = len; i != 0; i--)
    *p++ = q[i - 1];

  return SC_SUCCESS;
}

/** starcos_set_security_env
 * sets the security environment
 * \param card pointer to the sc_card object
 * \param env pointer to a sc_security_env object
 * \param se_num not used here
 * \return SC_SUCCESS on success or an error code
 *
 * This function sets the security environment (using the starcos spk 2.3
 * command MANAGE SECURITY ENVIRONMENT). In case a COMPUTE SIGNATURE
 * operation is requested , this function tries to detect whether
 * COMPUTE SIGNATURE or INTERNAL AUTHENTICATE must be used for signature
 * calculation.
 */
static int starcos_set_security_env(sc_card_t *card,
            const sc_security_env_t *env,
            int se_num)
{
  u8              *p, *pp;
  int              r, operation = env->operation;
  sc_apdu_t   apdu;
  u8               sbuf[SC_MAX_APDU_BUFFER_SIZE];
  starcos_ex_data *ex_data = (starcos_ex_data *)card->drv_data;

  p     = sbuf;

  if ( IS_V3x(card) ) {
    u8 algorithm_supported = (env->algorithm_flags & SC_ALGORITHM_RSA_PAD_PKCS1) ||
                (env->algorithm_flags & SC_ALGORITHM_RSA_PAD_PSS);
    if (!algorithm_supported ||
      !(env->flags & SC_SEC_ENV_KEY_REF_PRESENT) || env->key_ref_len != 1) {
      SC_FUNC_RETURN(card->ctx, SC_LOG_DEBUG_VERBOSE, SC_ERROR_INVALID_ARGUMENTS);
    }

    /* Tag '84' (length 1) denotes key name or key reference */
    *p++ = 0x84;
    *p++ = 0x01;
    if (env->flags & SC_SEC_ENV_FILE_REF_PRESENT) {
      *p++ = *env->key_ref | 0x80;
    } else {
      *p++ = *env->key_ref;
    }

    switch (operation) {
      case SC_SEC_OPERATION_SIGN:
        sc_format_apdu(card, &apdu, SC_APDU_CASE_3_SHORT, 0x22, 0x41, 0xB6);

        /* algorithm / cipher selector? */
        /* algorithm: 13.23 PKCS#1 signature with RSA (standard) */
        /* algorithm: 13.33.30 PKCS#1-PSS signature with SHA-256 */
        *p++ = 0x89;
        if (env->algorithm_flags & SC_ALGORITHM_RSA_PAD_PSS) {
          *p++ = 0x03;
          *p++ = 0x13;
          *p++ = 0x33;
          *p++ = 0x30;
        } else {
          // fall back, RSA PKCS1 Padding
          *p++ = 0x02;
          *p++ = 0x13;
          *p++ = 0x23;
        }
        break;

      case SC_SEC_OPERATION_DECIPHER:
        sc_format_apdu(card, &apdu, SC_APDU_CASE_3_SHORT, 0x22, 0x41, 0xB8);

        /* algorithm / cipher selector? */
        /* algorithm: 11.3  Encipherment RSA (standard) */
        /* algorithm: 11.31 Encipherment RSA (standard) with PKCS#1 padding */
        /* algorithm: 11.32 Encipherment RSA OAEP padding */
        *p++ = 0x89;
        *p++ = 0x02;
        *p++ = 0x11;
        if ( IS_V34(card) )
          *p++ = 0x30;
        else
          *p++ = 0x31;
        break;

      default:
        sc_log(card->ctx,
            "not supported for STARCOS 3.4 cards");
        return SC_ERROR_NOT_SUPPORTED;
    }

    apdu.data    = sbuf;
    apdu.datalen = p - sbuf;
    apdu.lc      = p - sbuf;
    apdu.le      = 0;
    r = sc_transmit_apdu(card, &apdu);
    LOG_TEST_RET(card->ctx, r, "APDU transmit failed");
    if (apdu.sw1 != 0x90 || apdu.sw2 != 0x00)
      SC_FUNC_RETURN(card->ctx, SC_LOG_DEBUG_VERBOSE, sc_check_sw(card, apdu.sw1, apdu.sw2));

    if ((operation == SC_SEC_OPERATION_SIGN && env->algorithm_flags == SC_ALGORITHM_RSA_PAD_PKCS1_TYPE_01)
      || (operation == SC_SEC_OPERATION_DECIPHER && env->algorithm_flags == SC_ALGORITHM_RSA_PAD_PKCS1_TYPE_02)) {
      // input data will be already padded
      ex_data->fix_digestInfo = 0;
    } else {
      ex_data->fix_digestInfo = env->algorithm_flags;
    }
    ex_data->sec_ops        = SC_SEC_OPERATION_SIGN;
    return SC_SUCCESS;
  }

  /* copy key reference, if present */
  if (env->flags & SC_SEC_ENV_KEY_REF_PRESENT) {
    if (env->flags & SC_SEC_ENV_KEY_REF_SYMMETRIC)
      *p++ = 0x83;
    else
      *p++ = 0x84;
    *p++ = env->key_ref_len;
    memcpy(p, env->key_ref, env->key_ref_len);
    p += env->key_ref_len;
  }
  pp = p;
  if (operation == SC_SEC_OPERATION_DECIPHER){
    if (env->algorithm_flags & SC_ALGORITHM_RSA_PAD_PKCS1_TYPE_02) {
      *p++ = 0x80;
      *p++ = 0x01;
      *p++ = 0x02;
    } else
      return SC_ERROR_INVALID_ARGUMENTS;
    sc_format_apdu(card, &apdu, SC_APDU_CASE_3_SHORT, 0x22, 0x81,
                   0xb8);
    apdu.data    = sbuf;
    apdu.datalen = p - sbuf;
    apdu.lc      = p - sbuf;
    apdu.le      = 0;
    r = sc_transmit_apdu(card, &apdu);
    LOG_TEST_RET(card->ctx, r, "APDU transmit failed");
    if (apdu.sw1 != 0x90 || apdu.sw2 != 0x00)
      SC_FUNC_RETURN(card->ctx, SC_LOG_DEBUG_VERBOSE, sc_check_sw(card, apdu.sw1, apdu.sw2));
    return SC_SUCCESS;
  }
  /* try COMPUTE SIGNATURE */
  if (operation == SC_SEC_OPERATION_SIGN && (
      env->algorithm_flags & SC_ALGORITHM_RSA_PAD_PKCS1_TYPE_01 ||
      env->algorithm_flags & SC_ALGORITHM_RSA_PAD_ISO9796)) {
    if (env->flags & SC_SEC_ENV_ALG_REF_PRESENT) {
      *p++ = 0x80;
      *p++ = 0x01;
      *p++ = env->algorithm_ref & 0xFF;
    } else if (env->flags & SC_SEC_ENV_ALG_PRESENT &&
                env->algorithm == SC_ALGORITHM_RSA) {
      /* set the method to use based on the algorithm_flags */
      *p++ = 0x80;
      *p++ = 0x01;
      if (env->algorithm_flags & SC_ALGORITHM_RSA_PAD_PKCS1_TYPE_01) {
        if (env->algorithm_flags & SC_ALGORITHM_RSA_HASH_SHA1)
          *p++ = 0x12;
        else if (env->algorithm_flags & SC_ALGORITHM_RSA_HASH_RIPEMD160)
          *p++ = 0x22;
        else if (env->algorithm_flags & SC_ALGORITHM_RSA_HASH_MD5)
          *p++ = 0x32;
        else {
          /* can't use COMPUTE SIGNATURE =>
           * try INTERNAL AUTHENTICATE */
          p = pp;
          operation = SC_SEC_OPERATION_AUTHENTICATE;
          goto try_authenticate;
        }
      } else if (env->algorithm_flags & SC_ALGORITHM_RSA_PAD_ISO9796) {
        if (env->algorithm_flags & SC_ALGORITHM_RSA_HASH_SHA1)
          *p++ = 0x11;
        else if (env->algorithm_flags & SC_ALGORITHM_RSA_HASH_RIPEMD160)
          *p++ = 0x21;
        else
          return SC_ERROR_INVALID_ARGUMENTS;
      } else
        return SC_ERROR_INVALID_ARGUMENTS;
    }
    sc_format_apdu(card, &apdu, SC_APDU_CASE_3_SHORT, 0x22, 0x41, 0xb6);
    apdu.data    = sbuf;
    apdu.datalen = p - sbuf;
    apdu.lc      = p - sbuf;
    apdu.le      = 0;
    /* we don't know whether to use
     * COMPUTE SIGNATURE or INTERNAL AUTHENTICATE */
    r = sc_transmit_apdu(card, &apdu);
    LOG_TEST_RET(card->ctx, r, "APDU transmit failed");
    if (apdu.sw1 == 0x90 && apdu.sw2 == 0x00) {
      ex_data->fix_digestInfo = 0;
      ex_data->sec_ops        = SC_SEC_OPERATION_SIGN;
      return SC_SUCCESS;
    }
    /* reset pointer */
    p = pp;
    /* doesn't work => try next op */
    operation = SC_SEC_OPERATION_AUTHENTICATE;
  }
try_authenticate:
  /* try INTERNAL AUTHENTICATE */
  if (operation == SC_SEC_OPERATION_AUTHENTICATE &&
      env->algorithm_flags & SC_ALGORITHM_RSA_PAD_PKCS1) {
    *p++ = 0x80;
    *p++ = 0x01;
    *p++ = 0x01;
    sc_format_apdu(card, &apdu, SC_APDU_CASE_3_SHORT, 0x22, 0x41,
                   0xa4);
    apdu.data    = sbuf;
    apdu.datalen = p - sbuf;
    apdu.lc      = p - sbuf;
    apdu.le      = 0;
    r = sc_transmit_apdu(card, &apdu);
    LOG_TEST_RET(card->ctx, r, "APDU transmit failed");
    if (apdu.sw1 != 0x90 || apdu.sw2 != 0x00)
      SC_FUNC_RETURN(card->ctx, SC_LOG_DEBUG_VERBOSE, sc_check_sw(card, apdu.sw1, apdu.sw2));
    ex_data->fix_digestInfo = env->algorithm_flags;
    ex_data->sec_ops        = SC_SEC_OPERATION_AUTHENTICATE;
    return SC_SUCCESS;
  }

  return SC_ERROR_INVALID_ARGUMENTS;
}

static int starcos_compute_signature(sc_card_t *card,
             const u8 * data, size_t datalen,
             u8 * out, size_t outlen)
{
  int r;
  sc_apdu_t apdu;
  u8 rbuf[SC_MAX_APDU_BUFFER_SIZE];
  u8 sbuf[SC_MAX_APDU_BUFFER_SIZE];
  starcos_ex_data *ex_data = (starcos_ex_data *)card->drv_data;

  if (datalen > SC_MAX_APDU_BUFFER_SIZE)
    SC_FUNC_RETURN(card->ctx, SC_LOG_DEBUG_VERBOSE, SC_ERROR_INVALID_ARGUMENTS);

  if (ex_data->sec_ops == SC_SEC_OPERATION_SIGN) {
    /* compute signature with the COMPUTE SIGNATURE command */

    if ( IS_V3x(card) ) {
      size_t tmp_len;

      sc_format_apdu(card, &apdu, SC_APDU_CASE_4, 0x2A,
             0x9E, 0x9A);
      apdu.resp = out;
      apdu.resplen = outlen;
      apdu.le = outlen;
      if (ex_data->fix_digestInfo) {
        // need to pad data
        unsigned int flags = ex_data->fix_digestInfo & SC_ALGORITHM_RSA_HASHES;
        if (flags == 0x00) {
          flags = SC_ALGORITHM_RSA_HASH_NONE;
        }
        tmp_len = sizeof(sbuf);
        if (ex_data->fix_digestInfo & SC_ALGORITHM_RSA_PAD_PSS) {
          r = sc_pkcs1_strip_digest_info_prefix(NULL, data, datalen, sbuf, &tmp_len);
        } else {
          r = sc_pkcs1_encode(card->ctx, flags, data, datalen, sbuf, &tmp_len, sizeof(sbuf)*8, NULL);
        }
        LOG_TEST_RET(card->ctx, r, "sc_pkcs1_encode failed");
      } else {
        memcpy(sbuf, data, datalen);
        tmp_len = datalen;
      }

      apdu.data = sbuf;
      apdu.datalen = tmp_len;
      apdu.lc = tmp_len;

      r = sc_transmit_apdu(card, &apdu);
      LOG_TEST_RET(card->ctx, r, "APDU transmit failed");
    } else {
      /* set the hash value     */
      sc_format_apdu(card, &apdu, SC_APDU_CASE_3_SHORT, 0x2A,
             0x90, 0x81);
      apdu.resp = rbuf;
      apdu.resplen = sizeof(rbuf);
      apdu.le = 0;
      memcpy(sbuf, data, datalen);
      apdu.data = sbuf;
      apdu.lc = datalen;
      apdu.datalen = datalen;
      r = sc_transmit_apdu(card, &apdu);
      LOG_TEST_RET(card->ctx, r, "APDU transmit failed");
      if (apdu.sw1 != 0x90 || apdu.sw2 != 0x00)
        SC_FUNC_RETURN(card->ctx, SC_LOG_DEBUG_VERBOSE,
               sc_check_sw(card, apdu.sw1, apdu.sw2));

      /* call COMPUTE SIGNATURE */
      sc_format_apdu(card, &apdu, SC_APDU_CASE_2_SHORT, 0x2A,
             0x9E, 0x9A);
      apdu.resp = rbuf;
      apdu.resplen = sizeof(rbuf);
      apdu.le = 256;

      apdu.lc = 0;
      apdu.datalen = 0;
      r = sc_transmit_apdu(card, &apdu);
      LOG_TEST_RET(card->ctx, r, "APDU transmit failed");
    }
    if (apdu.sw1 == 0x90 && apdu.sw2 == 0x00) {
      size_t len = apdu.resplen > outlen ? outlen : apdu.resplen;
      if ( out != apdu.resp ) {
        memcpy(out, apdu.resp, len);
      }
      SC_FUNC_RETURN(card->ctx, SC_LOG_DEBUG_VERBOSE, (int)len);
    }
  } else if (ex_data->sec_ops == SC_SEC_OPERATION_AUTHENTICATE) {
    size_t tmp_len;
    CHECK_NOT_SUPPORTED_V3_4(card);
    /* call INTERNAL AUTHENTICATE */
    sc_format_apdu(card, &apdu, SC_APDU_CASE_4_SHORT, 0x88, 0x10, 0x00);
    /* fix/create DigestInfo structure (if necessary) */
    if (ex_data->fix_digestInfo) {
      unsigned int flags = ex_data->fix_digestInfo & SC_ALGORITHM_RSA_HASHES;
      if (flags == 0x0)
        /* XXX: assume no hash is wanted */
        flags = SC_ALGORITHM_RSA_HASH_NONE;
      tmp_len = sizeof(sbuf);
      r = sc_pkcs1_encode(card->ctx, flags, data, datalen,
          sbuf, &tmp_len, sizeof(sbuf)*8, NULL);
      if (r < 0)
        return r;
    } else {
      memcpy(sbuf, data, datalen);
      tmp_len = datalen;
    }
    apdu.lc = tmp_len;
    apdu.data = sbuf;
    apdu.datalen = tmp_len;
    apdu.resp = rbuf;
    apdu.resplen = sizeof(rbuf);
    apdu.le = 256;
    r = sc_transmit_apdu(card, &apdu);
    LOG_TEST_RET(card->ctx, r, "APDU transmit failed");
    if (apdu.sw1 == 0x90 && apdu.sw2 == 0x00) {
      size_t len = apdu.resplen > outlen ? outlen : apdu.resplen;

      memcpy(out, apdu.resp, len);
      SC_FUNC_RETURN(card->ctx, SC_LOG_DEBUG_VERBOSE, (int)len);
    }
  } else
    SC_FUNC_RETURN(card->ctx, SC_LOG_DEBUG_VERBOSE, SC_ERROR_INVALID_ARGUMENTS);

  /* clear old state */
  ex_data->sec_ops = 0;
  ex_data->fix_digestInfo = 0;

  SC_FUNC_RETURN(card->ctx, SC_LOG_DEBUG_VERBOSE, sc_check_sw(card, apdu.sw1, apdu.sw2));
}

static int starcos_decipher(struct sc_card *card,
    const u8 * crgram, size_t crgram_len,
    u8 * out, size_t outlen)
{
  int r;
  size_t card_max_send_size = card->max_send_size;
  size_t reader_max_send_size = card->reader->max_send_size;
  size_t card_max_recv_size = card->max_recv_size;
  size_t reader_max_recv_size = card->reader->max_recv_size;

  if (sc_get_max_send_size(card) < crgram_len + 1) {
    /* Starcos doesn't support chaining for PSO:DEC, so we just _hope_
     * that both, the reader and the card are able to send enough data.
     * (data is prefixed with 1 byte padding content indicator) */
    card->max_send_size = crgram_len + 1;
    card->reader->max_send_size = crgram_len + 1;
  }

  if (sc_get_max_recv_size(card) < outlen) {
    /* Starcos doesn't support get response for PSO:DEC, so we just _hope_
     * that both, the reader and the card are able to receive enough data.
     */
    if (0 == (card->caps & SC_CARD_CAP_APDU_EXT)
        && outlen > 256) {
      card->max_recv_size = 256;
      card->reader->max_recv_size = 256;
    } else {
      card->max_recv_size = outlen;
      card->reader->max_recv_size = outlen;
    }
  }

  if ( IS_V3x(card) ) {
    sc_apdu_t apdu;

    u8 *sbuf = malloc(crgram_len + 1);
    if (sbuf == NULL)
      return SC_ERROR_OUT_OF_MEMORY;

    sc_format_apdu(card, &apdu, SC_APDU_CASE_4, 0x2A, 0x80, 0x86);
    apdu.resp    = out;
    apdu.resplen = outlen;
    apdu.le      = outlen;

    sbuf[0] = 0x81;
    memcpy(sbuf + 1, crgram, crgram_len);
    apdu.data = sbuf;
    apdu.lc = crgram_len + 1;
    apdu.datalen = crgram_len + 1;

    r = sc_transmit_apdu(card, &apdu);
    sc_mem_clear(sbuf, crgram_len + 1);

    free(sbuf);

    LOG_TEST_RET(card->ctx, r, "APDU transmit failed");

    if (apdu.sw1 == 0x90 && apdu.sw2 == 0x00)
      r = (int)apdu.resplen;
    else
      r = sc_check_sw(card, apdu.sw1, apdu.sw2);
  } else {
    r = iso_ops->decipher(card, crgram, crgram_len, out, outlen);
  }

  /* reset whatever we've modified above */
  card->max_send_size = card_max_send_size;
  card->reader->max_send_size = reader_max_send_size;
  card->max_recv_size = card_max_recv_size;
  card->reader->max_recv_size = reader_max_recv_size;

  LOG_FUNC_RETURN(card->ctx, r);
}

static int starcos_check_sw(sc_card_t *card, unsigned int sw1, unsigned int sw2)
{
  const int err_count = sizeof(starcos_errors)/sizeof(starcos_errors[0]);
  int i;

  sc_log(card->ctx,
    "sw1 = 0x%02x, sw2 = 0x%02x\n", sw1, sw2);

  if (sw1 == 0x90 && sw2 == 0x00)
    return SC_SUCCESS;
  if (sw1 == 0x63 && (sw2 & ~0x0fU) == 0xc0 )
  {
    sc_log(card->ctx,  "Verification failed (remaining tries: %d)\n",
    (sw2 & 0x0f));
    return SC_ERROR_PIN_CODE_INCORRECT;
  }

  /* check starcos error messages */
  for (i = 0; i < err_count; i++)
    if (starcos_errors[i].SWs == ((sw1 << 8) | sw2))
    {
      sc_log(card->ctx,  "%s\n", starcos_errors[i].errorstr);
      return starcos_errors[i].errorno;
    }

  /* iso error */
  return iso_ops->check_sw(card, sw1, sw2);
}

static int starcos_get_serialnr(sc_card_t *card, sc_serial_number_t *serial)
{
  int r;
  u8  rbuf[SC_MAX_APDU_BUFFER_SIZE];
  sc_apdu_t apdu;

  if (!serial)
    return SC_ERROR_INVALID_ARGUMENTS;

  /* see if we have cached serial number */
  if (card->serialnr.len) {
    memcpy(serial, &card->serialnr, sizeof(*serial));
    return SC_SUCCESS;
  }

  if ( IS_V3x(card) ) {
    card->serialnr.len = SC_MAX_SERIALNR;
    r = sc_parse_ef_gdo(card, card->serialnr.value, &card->serialnr.len, NULL, 0);
    if (r < 0) {
      card->serialnr.len = 0;
      return r;
    }
  } else {
    /* get serial number via GET CARD DATA */
    sc_format_apdu(card, &apdu, SC_APDU_CASE_2_SHORT, 0xf6, 0x00, 0x00);
    apdu.cla |= 0x80;
    apdu.resp = rbuf;
    apdu.resplen = sizeof(rbuf);
    apdu.le   = 256;
    apdu.lc   = 0;
    apdu.datalen = 0;
    r = sc_transmit_apdu(card, &apdu);
    LOG_TEST_RET(card->ctx, r, "APDU transmit failed");
    if (apdu.sw1 != 0x90 || apdu.sw2 != 0x00)
      return SC_ERROR_INTERNAL;
    /* cache serial number */
    memcpy(card->serialnr.value, apdu.resp, MIN(apdu.resplen, SC_MAX_SERIALNR));
    card->serialnr.len = MIN(apdu.resplen, SC_MAX_SERIALNR);
  }

  /* copy and return serial number */
  memcpy(serial, &card->serialnr, sizeof(*serial));

  return SC_SUCCESS;
}

static int starcos_card_ctl(sc_card_t *card, unsigned long cmd, void *ptr)
{
  sc_starcos_create_data *tmp;

  switch (cmd)
  {
  case SC_CARDCTL_STARCOS_CREATE_FILE:
    tmp = (sc_starcos_create_data *) ptr;
    if (tmp->type == SC_STARCOS_MF_DATA)
      return starcos_create_mf(card, tmp);
    else if (tmp->type == SC_STARCOS_DF_DATA)
      return starcos_create_df(card, tmp);
    else if (tmp->type == SC_STARCOS_EF_DATA)
      return starcos_create_ef(card, tmp);
    else
      return SC_ERROR_INTERNAL;
  case SC_CARDCTL_STARCOS_CREATE_END:
    return starcos_create_end(card, (sc_file_t *)ptr);
  case SC_CARDCTL_STARCOS_WRITE_KEY:
    return starcos_write_key(card, (sc_starcos_wkey_data *)ptr);
  case SC_CARDCTL_STARCOS_GENERATE_KEY:
    return starcos_gen_key(card, (sc_starcos_gen_key_data *)ptr);
  case SC_CARDCTL_ERASE_CARD:
    return starcos_erase_card(card);
  case SC_CARDCTL_GET_SERIALNR:
    return starcos_get_serialnr(card, (sc_serial_number_t *)ptr);
  default:
    return SC_ERROR_NOT_SUPPORTED;
  }
}

static int starcos_logout_v3_x(sc_card_t *card)
{
  return SC_ERROR_NOT_SUPPORTED;
}

static int starcos_logout(sc_card_t *card)
{
  int r;
  sc_apdu_t apdu;
  const u8 mf_buf[2] = {0x3f, 0x00};

  if ( IS_V3x(card) ) {
    return starcos_logout_v3_x(card);
  }

  sc_format_apdu(card, &apdu, SC_APDU_CASE_3_SHORT, 0xA4, 0x00, 0x0C);
  apdu.le = 0;
  apdu.lc = 2;
  apdu.data    = mf_buf;
  apdu.datalen = 2;
  apdu.resplen = 0;

  r = sc_transmit_apdu(card, &apdu);
  LOG_TEST_RET(card->ctx, r, "APDU re-transmit failed");

  if (apdu.sw1 == 0x69 && apdu.sw2 == 0x85)
    /* the only possible reason for this error here is, afaik,
     * that no MF exists, but then there's no need to logout
     * => return SC_SUCCESS
     */
    return SC_SUCCESS;
  return sc_check_sw(card, apdu.sw1, apdu.sw2);
}

static int starcos_pin_cmd(sc_card_t *card, struct sc_pin_cmd_data *data,
          int *tries_left)
{
  int r;

  LOG_FUNC_CALLED(card->ctx);
  starcos_ex_data * ex_data = (starcos_ex_data*)card->drv_data;
  if ( IS_V3x(card) ) {
    data->flags |= SC_PIN_CMD_NEED_PADDING;
    data->pin1.encoding = ex_data->pin_encoding;
  }
  r = iso_ops->pin_cmd(card, data, tries_left);
  SC_FUNC_RETURN(card->ctx, SC_LOG_DEBUG_VERBOSE, r);
}

static struct sc_card_driver * sc_get_driver(void)
{
  struct sc_card_driver *iso_drv = sc_get_iso7816_driver();
  if (iso_ops == NULL)
    iso_ops = iso_drv->ops;

  starcos_ops = *iso_drv->ops;
  starcos_ops.match_card = starcos_match_card;
  starcos_ops.init   = starcos_init;
  starcos_ops.finish = starcos_finish;
  starcos_ops.select_file = starcos_select_file;
  starcos_ops.get_challenge = starcos_get_challenge;
  starcos_ops.check_sw    = starcos_check_sw;
  starcos_ops.create_file = starcos_create_file;
  starcos_ops.delete_file = NULL;
  starcos_ops.set_security_env  = starcos_set_security_env;
  starcos_ops.compute_signature = starcos_compute_signature;
  starcos_ops.decipher = starcos_decipher;
  starcos_ops.card_ctl    = starcos_card_ctl;
  starcos_ops.logout      = starcos_logout;
  starcos_ops.pin_cmd     = starcos_pin_cmd;

  return &starcos_drv;
}

struct sc_card_driver * sc_get_starcos_driver(void)
{
  return sc_get_driver();
}

Coverage Report

Created: 2025-07-18 06:10