New API function mifare_desfire_set_default_key().

NEWS

@@ -4,8 +4,9 @@ Changes between 0.2.3 and 0.3.0  [XX xxx XXXX]
      mifare_desfire_authenticate_iso() and mifare_desfire_authenticate_aes().
   *) Add support for 3K3DES and AES cryptographic operations.
   *) New functions mifare_desfire_free_mem(),
-     mifare_desfire_set_configuration(), mifare_desfire_get_card_uid(), for
-     Mifare DESFire EV1 targets manipulation.
+     mifare_desfire_set_configuration(), mifare_desfire_set_default_key(),
+     mifare_desfire_get_card_uid(), for Mifare DESFire EV1 targets
+     manipulation.
   *) Deprecate authentication information when deleting the currently selected
      application
 

examples/Makefile.am

@@ -6,6 +6,7 @@ AM_LDFLAGS = @LIBNFC_LIBS@
 bin_PROGRAMS = mifare-classic-format \
 	       mifare-classic-write-ndef \
 	       mifare-desfire-access \
+	       mifare-desfire-ev1-configure-default-key \
 	       mifare-desfire-ev1-configure-random-uid \
 	       mifare-desfire-format \
 	       mifare-desfire-info \
@@ -20,6 +21,9 @@ mifare_classic_write_ndef_LDADD = -lnfc $(top_builddir)/libfreefare/libfreefare.
 mifare_desfire_access_SOURCES = mifare-desfire-access.c
 mifare_desfire_access_LDADD = -lnfc $(top_builddir)/libfreefare/libfreefare.la
 
+mifare_desfire_ev1_configure_default_key_SOURCES = mifare-desfire-ev1-configure-default-key.c
+mifare_desfire_ev1_configure_default_key_LDADD = -lnfc $(top_builddir)/libfreefare/libfreefare.la
+
 mifare_desfire_ev1_configure_random_uid_SOURCES = mifare-desfire-ev1-configure-random-uid.c
 mifare_desfire_ev1_configure_random_uid_LDADD = -lnfc $(top_builddir)/libfreefare/libfreefare.la
 

examples/mifare-desfire-ev1-configure-default-key.c

@@ -0,0 +1,237 @@
+/*-
+ * Copyright (C) 2010, Romain Tartiere.
+ * 
+ * This program 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 3 of the License, or (at your
+ * option) any later version.
+ * 
+ * This program 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 General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ * 
+ * $Id$
+ */
+
+#include "config.h"
+
+#include <err.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <nfc/nfc.h>
+
+#include <freefare.h>
+
+uint8_t null_key_data[8] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
+uint8_t new_key_data[8]  = { 0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77 };
+
+#define NEW_KEY_VERSION 0x34;
+
+struct {
+    bool interactive;
+} configure_options = {
+    .interactive = true
+};
+
+void
+usage(char *progname)
+{
+    fprintf (stderr, "usage: %s [-y]\n", progname);
+    fprintf (stderr, "\nOptions:\n");
+    fprintf (stderr, "  -y     Do not ask for confirmation\n");
+}
+
+int
+main(int argc, char *argv[])
+{
+    int ch;
+    int error = EXIT_SUCCESS;
+    nfc_device_t *device = NULL;
+    MifareTag *tags = NULL;
+
+    while ((ch = getopt (argc, argv, "hy")) != -1) {
+	switch (ch) {
+	case 'h':
+	    usage(argv[0]);
+	    exit (EXIT_SUCCESS);
+	    break;
+	case 'y':
+	    configure_options.interactive = false;
+	    break;
+	default:
+	    usage(argv[0]);
+	    exit (EXIT_FAILURE);
+	}
+    }
+    argc -= optind;
+    argv += optind;
+
+    nfc_device_desc_t devices[8];
+    size_t device_count;
+
+    nfc_list_devices (devices, 8, &device_count);
+    if (!device_count)
+	errx (EXIT_FAILURE, "No NFC device found.");
+
+    for (size_t d = 0; (!error) && (d < device_count); d++) {
+	device = nfc_connect (&(devices[d]));
+	if (!device) {
+	    warnx ("nfc_connect() failed.");
+	    error = EXIT_FAILURE;
+	    continue;
+	}
+
+	tags = freefare_get_tags (device);
+	if (!tags) {
+	    nfc_disconnect (device);
+	    errx (EXIT_FAILURE, "Error listing Mifare DESFire tags.");
+	}
+
+	for (int i = 0; (!error) && tags[i]; i++) {
+	    if (DESFIRE != freefare_get_tag_type (tags[i]))
+		continue;
+
+	    char *tag_uid = freefare_get_tag_uid (tags[i]);
+	    char buffer[BUFSIZ];
+
+	    printf ("Found %s with UID %s. ", freefare_get_tag_friendly_name (tags[i]), tag_uid);
+	    bool do_it = true;
+	    int res;
+
+	    if (configure_options.interactive) {
+		printf ("Change default key? [yN] ");
+		fgets (buffer, BUFSIZ, stdin);
+		do_it = ((buffer[0] == 'y') || (buffer[0] == 'Y'));
+	    } else {
+		printf ("\n");
+	    }
+
+	    if (do_it) {
+
+		res = mifare_desfire_connect (tags[i]);
+		if (res < 0) {
+		    warnx ("Can't connect to Mifare DESFire target.");
+		    error = EXIT_FAILURE;
+		    break;
+		}
+
+		MifareDESFireKey default_key = mifare_desfire_des_key_new_with_version (null_key_data);
+		res = mifare_desfire_authenticate (tags[i], 0, default_key);
+		if (res < 0) {
+		    freefare_perror (tags[i], "mifare_desfire_authenticate");
+		    error = EXIT_FAILURE;
+		    break;
+		}
+		mifare_desfire_key_free (default_key);
+
+		MifareDESFireKey new_key = mifare_desfire_des_key_new (new_key_data);
+		mifare_desfire_key_set_version (new_key, NEW_KEY_VERSION);
+		res = mifare_desfire_set_default_key (tags[i], new_key);
+		free (new_key);
+		if (res < 0) {
+		    freefare_perror (tags[i], "mifare_desfire_set_default_key");
+		    error = EXIT_FAILURE;
+		    break;
+		}
+
+		/*
+		 * Perform some tests to ensure the function actually worked
+		 * (it's hard to create a unit-test to do so).
+		 */
+
+		MifareDESFireAID aid = mifare_desfire_aid_new (0x112233);
+		res = mifare_desfire_create_application (tags[i], aid, 0xFF, 1);
+
+		if (res < 0) {
+		    freefare_perror (tags[i], "mifare_desfire_create_application");
+		    error = EXIT_FAILURE;
+		    break;
+		}
+
+		res = mifare_desfire_select_application (tags[i], aid);
+		if (res < 0) {
+		    freefare_perror (tags[i], "mifare_desfire_select_application");
+		    error = EXIT_FAILURE;
+		    break;
+		}
+
+		uint8_t version;
+		res = mifare_desfire_get_key_version (tags[i], 0, &version);
+		if (res < 0) {
+		    freefare_perror (tags[i], "mifare_desfire_get_key_version");
+		    error = EXIT_FAILURE;
+		    break;
+		}
+
+		if (version != NEW_KEY_VERSION) {
+		    fprintf (stderr, "Wrong key version: %02x (expected %02x).\n");
+		    error = EXIT_FAILURE;
+		    /* continue */
+		}
+
+		new_key = mifare_desfire_des_key_new (new_key_data);
+		res = mifare_desfire_authenticate (tags[i], 0, new_key);
+		free (new_key);
+		if (res < 0) {
+		    freefare_perror (tags[i], "mifare_desfire_authenticate");
+		    error = EXIT_FAILURE;
+		    break;
+		}
+
+		free (aid);
+
+		/* Resetdefault settings */
+
+		res = mifare_desfire_select_application (tags[i], NULL);
+		if (res < 0) {
+		    freefare_perror (tags[i], "mifare_desfire_select_application");
+		    error = EXIT_FAILURE;
+		    break;
+		}
+
+		default_key = mifare_desfire_des_key_new (null_key_data);
+
+		res = mifare_desfire_authenticate (tags[i], 0, default_key);
+		if (res < 0) {
+		    freefare_perror (tags[i], "mifare_desfire_authenticate");
+		    error = EXIT_FAILURE;
+		    break;
+		}
+
+		res = mifare_desfire_set_default_key (tags[i], default_key);
+		if (res < 0) {
+		    freefare_perror (tags[i], "mifare_desfire_set_default_key");
+		    error = EXIT_FAILURE;
+		    break;
+		}
+
+		mifare_desfire_key_free (default_key);
+
+		/* Wipeout the card */
+
+		res = mifare_desfire_format_picc (tags[i]);
+		if (res < 0) {
+		    freefare_perror (tags[i], "mifare_desfire_format_picc");
+		    error = EXIT_FAILURE;
+		    break;
+		}
+
+		mifare_desfire_disconnect (tags[i]);
+	    }
+
+	    free (tag_uid);
+	}
+
+	freefare_free_tags (tags);
+	nfc_disconnect (device);
+    }
+
+    exit (error);
+}

libfreefare/freefare.h

@@ -319,6 +319,7 @@ int		 mifare_desfire_format_picc (MifareTag tag);
 int		 mifare_desfire_get_version (MifareTag tag, struct mifare_desfire_version_info *version_info);
 int		 mifare_desfire_free_mem (MifareTag tag, uint32_t *size);
 int		 mifare_desfire_set_configuration (MifareTag tag, bool disable_format, bool enable_random_uid);
+int		 mifare_desfire_set_default_key (MifareTag tag, MifareDESFireKey key);
 int		 mifare_desfire_get_card_uid (MifareTag tag, char **uid);
 int		 mifare_desfire_get_file_ids (MifareTag tag, uint8_t *files[], size_t *count);
 int		 mifare_desfire_get_file_settings (MifareTag tag, uint8_t file_no, struct mifare_desfire_file_settings *settings);

libfreefare/mifare_desfire.c

@@ -892,6 +892,43 @@ mifare_desfire_set_configuration (MifareTag tag, bool disable_format, bool enabl
     return 0;
 }
 
+int
+mifare_desfire_set_default_key (MifareTag tag, MifareDESFireKey key)
+{
+    ASSERT_ACTIVE (tag);
+    ASSERT_MIFARE_DESFIRE (tag);
+
+    BUFFER_INIT (cmd, 34);
+    BUFFER_INIT (res, 1 + CMAC_LENGTH);
+
+    BUFFER_APPEND (cmd, 0x5C);
+    BUFFER_APPEND (cmd, 0x01);
+    size_t key_data_length;
+    switch (key->type) {
+    case T_DES:
+    case T_3DES:
+    case T_AES:
+	key_data_length = 16;
+	break;
+    case T_3K3DES:
+	key_data_length = 24;
+	break;
+    }
+    BUFFER_APPEND_BYTES (cmd, key->data, key_data_length);
+    while (__cmd_n < 26)
+	BUFFER_APPEND (cmd, 0x00);
+    BUFFER_APPEND (cmd, mifare_desfire_key_get_version (key));
+
+    uint8_t *p = mifare_cryto_preprocess_data (tag, cmd, &__cmd_n, 2, MDCM_ENCIPHERED | ENC_COMMAND);
+
+    DESFIRE_TRANSCEIVE2 (tag, p, __cmd_n, res);
+
+    ssize_t sn = __res_n;
+    p = mifare_cryto_postprocess_data (tag, res, &sn, MDCM_PLAIN | CMAC_COMMAND | CMAC_VERIFY);
+
+    return 0;
+}
+
 int
 mifare_desfire_get_card_uid (MifareTag tag, char **uid)
 {