142 lines
3.4 KiB
C
142 lines
3.4 KiB
C
/*-
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* Copyright (C) 2010, Romain Tartiere.
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*
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* This program is free software: you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by the
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* Free Software Foundation, either version 3 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>
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*
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* $Id$
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <openssl/des.h>
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#include <freefare.h>
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#include "freefare_internal.h"
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static inline void update_key_schedules (MifareDESFireKey key);
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static inline void
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update_key_schedules (MifareDESFireKey key)
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{
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DES_set_key ((DES_cblock *)key->data, &(key->ks1));
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DES_set_key ((DES_cblock *)(key->data + 8), &(key->ks2));
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}
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MifareDESFireKey
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mifare_desfire_des_key_new (uint8_t value[8])
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{
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uint8_t data[8];
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memcpy (data, value, 8);
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for (int n=0; n < 8; n++)
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data[n] &= 0xfe;
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return mifare_desfire_des_key_new_with_version (data);
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}
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MifareDESFireKey
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mifare_desfire_des_key_new_with_version (uint8_t value[8])
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{
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MifareDESFireKey key;
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if ((key = malloc (sizeof (struct mifare_desfire_key)))) {
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memcpy (key->data, value, 8);
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memcpy (key->data+8, value, 8);
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update_key_schedules (key);
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key->type = T_DES;
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}
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return key;
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}
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MifareDESFireKey
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mifare_desfire_3des_key_new (uint8_t value[16])
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{
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uint8_t data[16];
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memcpy (data, value, 16);
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for (int n=0; n < 8; n++)
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data[n] &= 0xfe;
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for (int n=8; n < 16; n++)
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data[n] |= 0x01;
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return mifare_desfire_3des_key_new_with_version (data);
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}
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MifareDESFireKey
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mifare_desfire_3des_key_new_with_version (uint8_t value[16])
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{
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MifareDESFireKey key;
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if ((key = malloc (sizeof (struct mifare_desfire_key)))) {
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memcpy (key->data, value, 16);
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update_key_schedules (key);
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key->type = T_3DES;
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}
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return key;
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}
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uint8_t
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mifare_desfire_key_get_version (MifareDESFireKey key)
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{
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uint8_t version = 0;
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for (int n = 0; n < 8; n++) {
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version |= ((key->data[n] & 1) << (7 - n));
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}
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return version;
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}
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void
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mifare_desfire_key_set_version (MifareDESFireKey key, uint8_t version)
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{
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for (int n = 0; n < 8; n++) {
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uint8_t version_bit = ((version & (1 << (7-n))) >> (7-n));
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key->data[n] &= 0xfe;
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key->data[n] |= version_bit;
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if (key->type == T_DES) {
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key->data[n+8] = key->data[n];
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} else {
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// Write ~version to avoid turning a 3DES key into a DES key
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key->data[n+8] &= 0xfe;
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key->data[n+8] |= ~version_bit;
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}
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}
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}
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MifareDESFireKey
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mifare_desfire_session_key_new (uint8_t rnda[8], uint8_t rndb[8], MifareDESFireKey authentication_key)
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{
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MifareDESFireKey key;
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uint8_t buffer[16];
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memcpy (buffer, rnda, 4);
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memcpy (buffer+4, rndb, 4);
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memcpy (buffer+8, rnda+4, 4);
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memcpy (buffer+12, rndb+4, 4);
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switch (authentication_key->type) {
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case T_DES:
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key = mifare_desfire_des_key_new_with_version (buffer);
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break;
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case T_3DES:
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key = mifare_desfire_3des_key_new_with_version (buffer);
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break;
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}
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return key;
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}
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void
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mifare_desfire_key_free (MifareDESFireKey key)
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{
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free (key);
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}
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