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1 /*****************************************************************************
2 * WARNING
3 *
4 * THIS CODE IS CREATED FOR EXPERIMENTATION AND EDUCATIONAL USE ONLY.
5 *
6 * USAGE OF THIS CODE IN OTHER WAYS MAY INFRINGE UPON THE INTELLECTUAL
7 * PROPERTY OF OTHER PARTIES, SUCH AS INSIDE SECURE AND HID GLOBAL,
8 * AND MAY EXPOSE YOU TO AN INFRINGEMENT ACTION FROM THOSE PARTIES.
9 *
10 * THIS CODE SHOULD NEVER BE USED TO INFRINGE PATENTS OR INTELLECTUAL PROPERTY RIGHTS.
11 *
12 *****************************************************************************
13 *
14 * This file is part of loclass. It is a reconstructon of the cipher engine
15 * used in iClass, and RFID techology.
16 *
17 * The implementation is based on the work performed by
18 * Flavio D. Garcia, Gerhard de Koning Gans, Roel Verdult and
19 * Milosch Meriac in the paper "Dismantling IClass".
20 *
21 * Copyright (C) 2014 Martin Holst Swende
22 *
23 * This is free software: you can redistribute it and/or modify
24 * it under the terms of the GNU General Public License version 2 as published
25 * by the Free Software Foundation.
26 *
27 * This file is distributed in the hope that it will be useful,
28 * but WITHOUT ANY WARRANTY; without even the implied warranty of
29 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
30 * GNU General Public License for more details.
31 *
32 * You should have received a copy of the GNU General Public License
33 * along with loclass. If not, see <http://www.gnu.org/licenses/>.
34 *
35 *
36 *
37 ****************************************************************************/
38
39
40 #ifndef ELITE_CRACK_H
41 #define ELITE_CRACK_H
42 void permutekey(uint8_t key[8], uint8_t dest[8]);
43 /**
44 * Permutes a key from iclass specific format to NIST format
45 * @brief permutekey_rev
46 * @param key
47 * @param dest
48 */
49 void permutekey_rev(uint8_t key[8], uint8_t dest[8]);
50 //Crack status, see below
51 #define CRACKED 0x0100
52 #define BEING_CRACKED 0x0200
53 #define CRACK_FAILED 0x0400
54
55 /**
56 * Perform a bruteforce against a file which has been saved by pm3
57 *
58 * @brief bruteforceFile
59 * @param filename
60 * @param keytable an arrah (128 x 16 bit ints). This is where the keydata is stored.
61 * OBS! the upper part of the 16 bits store crack-status,
62 * @return
63 */
64 int bruteforceFile(const char *filename, uint16_t keytable[]);
65 /**
66 *
67 * @brief Same as above, if you don't care about the returned keytable (results only printed on screen)
68 * @param filename
69 * @return
70 */
71 int bruteforceFileNoKeys(const char *filename);
72 /**
73 * @brief Same as bruteforcefile, but uses a an array of dumpdata instead
74 * @param dump
75 * @param dumpsize
76 * @param keytable
77 * @return
78 */
79 int bruteforceDump(uint8_t dump[], size_t dumpsize, uint16_t keytable[]);
80
81 /**
82 This is how we expect each 'entry' in a dumpfile to look
83 **/
84 typedef struct {
85 uint8_t csn[8];
86 uint8_t cc_nr[12];
87 uint8_t mac[4];
88
89 }dumpdata;
90
91 /**
92 * @brief Performs brute force attack against a dump-data item, containing csn, cc_nr and mac.
93 *This method calculates the hash1 for the CSN, and determines what bytes need to be bruteforced
94 *on the fly. If it finds that more than three bytes need to be bruteforced, it aborts.
95 *It updates the keytable with the findings, also using the upper half of the 16-bit ints
96 *to signal if the particular byte has been cracked or not.
97 *
98 * @param dump The dumpdata from iclass reader attack.
99 * @param keytable where to write found values.
100 * @return
101 */
102 int bruteforceItem(dumpdata item, uint16_t keytable[]);
103 /**
104 * Hash1 takes CSN as input, and determines what bytes in the keytable will be used
105 * when constructing the K_sel.
106 * @param csn the CSN used
107 * @param k output
108 */
109 void hash1(uint8_t csn[] , uint8_t k[]);
110 void hash2(uint8_t *key64, uint8_t *outp_keytable);
111 /**
112 * From dismantling iclass-paper:
113 * Assume that an adversary somehow learns the first 16 bytes of hash2(K_cus ), i.e., y [0] and z [0] .
114 * Then he can simply recover the master custom key K_cus by computing
115 * K_cus = ~DES(z[0] , y[0] ) .
116 *
117 * Furthermore, the adversary is able to verify that he has the correct K cus by
118 * checking whether z [0] = DES enc (K_cus , ~K_cus ).
119 * @param keytable an array (128 bytes) of hash2(kcus)
120 * @param master_key where to put the master key
121 * @return 0 for ok, 1 for failz
122 */
123 int calculateMasterKey(uint8_t first16bytes[], uint64_t master_key[] );
124
125 /**
126 * @brief Test function
127 * @return
128 */
129 int testElite();
130
131 /**
132 Here are some pretty optimal values that can be used to recover necessary data in only
133 eight auth attempts.
134 // CSN HASH1 Bytes recovered //
135 { {0x00,0x0B,0x0F,0xFF,0xF7,0xFF,0x12,0xE0} , {0x01,0x01,0x00,0x00,0x45,0x01,0x45,0x45 } ,{0,1 }},
136 { {0x00,0x13,0x94,0x7e,0x76,0xff,0x12,0xe0} , {0x02,0x0c,0x01,0x00,0x45,0x01,0x45,0x45} , {2,12}},
137 { {0x2a,0x99,0xac,0x79,0xec,0xff,0x12,0xe0} , {0x07,0x45,0x0b,0x00,0x45,0x01,0x45,0x45} , {7,11}},
138 { {0x17,0x12,0x01,0xfd,0xf7,0xff,0x12,0xe0} , {0x03,0x0f,0x00,0x00,0x45,0x01,0x45,0x45} , {3,15}},
139 { {0xcd,0x56,0x01,0x7c,0x6f,0xff,0x12,0xe0} , {0x04,0x00,0x08,0x00,0x45,0x01,0x45,0x45} , {4,8}},
140 { {0x4b,0x5e,0x0b,0x72,0xef,0xff,0x12,0xe0} , {0x0e,0x06,0x08,0x00,0x45,0x01,0x45,0x45} , {6,14}},
141 { {0x00,0x73,0xd8,0x75,0x58,0xff,0x12,0xe0} , {0x0b,0x09,0x0f,0x00,0x45,0x01,0x05,0x45} , {9,5}},
142 { {0x0c,0x90,0x32,0xf3,0x5d,0xff,0x12,0xe0} , {0x0d,0x0f,0x0a,0x00,0x45,0x01,0x05,0x45} , {10,13}},
143
144 **/
145
146
147 #endif
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