+/*****************************************************************************
+ * WARNING
+ *
+ * THIS CODE IS CREATED FOR EXPERIMENTATION AND EDUCATIONAL USE ONLY.
+ *
+ * USAGE OF THIS CODE IN OTHER WAYS MAY INFRINGE UPON THE INTELLECTUAL
+ * PROPERTY OF OTHER PARTIES, SUCH AS INSIDE SECURE AND HID GLOBAL,
+ * AND MAY EXPOSE YOU TO AN INFRINGEMENT ACTION FROM THOSE PARTIES.
+ *
+ * THIS CODE SHOULD NEVER BE USED TO INFRINGE PATENTS OR INTELLECTUAL PROPERTY RIGHTS.
+ *
+ *****************************************************************************
+ *
+ * This file is part of loclass. It is a reconstructon of the cipher engine
+ * used in iClass, and RFID techology.
+ *
+ * The implementation is based on the work performed by
+ * Flavio D. Garcia, Gerhard de Koning Gans, Roel Verdult and
+ * Milosch Meriac in the paper "Dismantling IClass".
+ *
+ * Copyright (C) 2014 Martin Holst Swende
+ *
+ * This is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ *
+ * This file 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 General Public License
+ * along with loclass. If not, see <http://www.gnu.org/licenses/>.
+ *
+ *
+ *
+ ****************************************************************************/
+
#include <stdint.h>
#include <stdbool.h>
#include <string.h>
k[0] = csn[0]^csn[1]^csn[2]^csn[3]^csn[4]^csn[5]^csn[6]^csn[7];
k[1] = csn[0]+csn[1]+csn[2]+csn[3]+csn[4]+csn[5]+csn[6]+csn[7];
k[2] = rr(swap( csn[2]+k[1] ));
- k[3] = rr(swap( csn[3]+k[0] ));
- k[4] = ~rr(swap( csn[4]+k[2] ))+1;
- k[5] = ~rr(swap( csn[5]+k[3] ))+1;
+ k[3] = rl(swap( csn[3]+k[0] ));
+ k[4] = ~rr( csn[4]+k[2] )+1;
+ k[5] = ~rl( csn[5]+k[3] )+1;
k[6] = rr( csn[6]+(k[4]^0x3c) );
k[7] = rl( csn[7]+(k[5]^0xc3) );
int i;
for(i = 7; i >=0; i--)
k[i] = k[i] & 0x7F;
}
+/**
+Definition 14. Define the rotate key function rk : (F 82 ) 8 Ć N ā (F 82 ) 8 as
+rk(x [0] . . . x [7] , 0) = x [0] . . . x [7]
+rk(x [0] . . . x [7] , n + 1) = rk(rl(x [0] ) . . . rl(x [7] ), n)
+**/
+void rk(uint8_t *key, uint8_t n, uint8_t *outp_key)
+{
+
+ memcpy(outp_key, key, 8);
+
+ uint8_t j;
+
+ while(n-- > 0)
+ for(j=0; j < 8 ; j++)
+ outp_key[j] = rl(outp_key[j]);
+
+ return;
+}
+
+static des_context ctx_enc = {DES_ENCRYPT,{0}};
+static des_context ctx_dec = {DES_DECRYPT,{0}};
+
+void desdecrypt_iclass(uint8_t *iclass_key, uint8_t *input, uint8_t *output)
+{
+ uint8_t key_std_format[8] = {0};
+ permutekey_rev(iclass_key, key_std_format);
+ des_setkey_dec( &ctx_dec, key_std_format);
+ des_crypt_ecb(&ctx_dec,input,output);
+}
+void desencrypt_iclass(uint8_t *iclass_key, uint8_t *input, uint8_t *output)
+{
+ uint8_t key_std_format[8] = {0};
+ permutekey_rev(iclass_key, key_std_format);
+ des_setkey_enc( &ctx_enc, key_std_format);
+ des_crypt_ecb(&ctx_enc,input,output);
+}
+
+/**
+ * @brief Insert uint8_t[8] custom master key to calculate hash2 and return key_select.
+ * @param key unpermuted custom key
+ * @param hash1 hash1
+ * @param key_sel output key_sel=h[hash1[i]]
+ */
+void hash2(uint8_t *key64, uint8_t *outp_keytable)
+{
+ /**
+ *Expected:
+ * High Security Key Table
+
+00 F1 35 59 A1 0D 5A 26 7F 18 60 0B 96 8A C0 25 C1
+10 BF A1 3B B0 FF 85 28 75 F2 1F C6 8F 0E 74 8F 21
+20 14 7A 55 16 C8 A9 7D B3 13 0C 5D C9 31 8D A9 B2
+30 A3 56 83 0F 55 7E DE 45 71 21 D2 6D C1 57 1C 9C
+40 78 2F 64 51 42 7B 64 30 FA 26 51 76 D3 E0 FB B6
+50 31 9F BF 2F 7E 4F 94 B4 BD 4F 75 91 E3 1B EB 42
+60 3F 88 6F B8 6C 2C 93 0D 69 2C D5 20 3C C1 61 95
+70 43 08 A0 2F FE B3 26 D7 98 0B 34 7B 47 70 A0 AB
+
+**** The 64-bit HS Custom Key Value = 5B7C62C491C11B39 ******/
+ uint8_t key64_negated[8] = {0};
+ uint8_t z[8][8]={{0},{0}};
+ uint8_t temp_output[8]={0};
+ //calculate complement of key
+ int i;
+ for(i=0;i<8;i++)
+ key64_negated[i]= ~key64[i];
+
+ // Once again, key is on iclass-format
+ desencrypt_iclass(key64, key64_negated, z[0]);
+
+ prnlog("\nHigh security custom key (Kcus):");
+ printvar("z0 ", z[0],8);
+
+ uint8_t y[8][8]={{0},{0}};
+
+ // y[0]=DES_dec(z[0],~key)
+ // Once again, key is on iclass-format
+ desdecrypt_iclass(z[0], key64_negated, y[0]);
+ printvar("y0 ", y[0],8);
+
+ for(i=1; i<8; i++)
+ {
+ // z [i] = DES dec (rk(K cus , i), z [iā1] )
+ rk(key64, i, temp_output);
+ //y [i] = DES enc (rk(K cus , i), y [iā1] )
+
+ desdecrypt_iclass(temp_output,z[i-1], z[i]);
+ desencrypt_iclass(temp_output,y[i-1], y[i]);
+
+ }
+ if(outp_keytable != NULL)
+ {
+ for(i = 0 ; i < 8 ; i++)
+ {
+ memcpy(outp_keytable+i*16,y[i],8);
+ memcpy(outp_keytable+8+i*16,z[i],8);
+ }
+ }else
+ {
+ printarr_human_readable("hash2", outp_keytable,128);
+ }
+}
/**
* @brief Reads data from the iclass-reader-attack dump file.
errors += bruteforceItem(*attack, keytable);
}
free(attack);
- clock_t t2 = clock();
- float diff = (((float)t2 - (float)t1) / CLOCKS_PER_SEC );
+ t1 = clock() - t1;
+ float diff = ((float)t1 / CLOCKS_PER_SEC );
prnlog("\nPerformed full crack in %f seconds",diff);
// Pick out the first 16 bytes of the keytable.
long fsize = ftell(f);
fseek(f, 0, SEEK_SET);
+ if (fsize < 0) {
+ prnlog("Error, when getting filesize");
+ fclose(f);
+ return 1;
+ }
+
uint8_t *dump = malloc(fsize);
- size_t bytes_read = fread(dump, fsize, 1, f);
+ size_t bytes_read = fread(dump, 1, fsize, f);
fclose(f);
if (bytes_read < fsize)
{
prnlog("Error, could only read %d bytes (should be %d)",bytes_read, fsize );
}
- return bruteforceDump(dump,fsize,keytable);
+
+ uint8_t res = bruteforceDump(dump,fsize,keytable);
+ free(dump);
+ return res;
}
/**
*
**** The 64-bit HS Custom Key Value = 5B7C62C491C11B39 ****
**/
uint16_t keytable[128] = {0};
- //save some time...
- startvalue = 0x7B0000;
- errors |= bruteforceFile("iclass_dump.bin",keytable);
+
+ //Test a few variants
+ if(fileExists("iclass_dump.bin"))
+ {
+ errors |= bruteforceFile("iclass_dump.bin",keytable);
+ }else if(fileExists("loclass/iclass_dump.bin")){
+ errors |= bruteforceFile("loclass/iclass_dump.bin",keytable);
+ }else if(fileExists("client/loclass/iclass_dump.bin")){
+ errors |= bruteforceFile("client/loclass/iclass_dump.bin",keytable);
+ }else{
+ prnlog("Error: The file iclass_dump.bin was not found!");
+ }
}
return errors;
}
prnlog("[+] Iclass key permutation OK!");
return 0;
}
+int _testHash1()
+{
+ uint8_t csn[8]= {0x01,0x02,0x03,0x04,0xF7,0xFF,0x12,0xE0};
+ uint8_t k[8] = {0};
+ hash1(csn, k);
+ uint8_t expected[8] = {0x7E,0x72,0x2F,0x40,0x2D,0x02,0x51,0x42};
+ if(memcmp(k,expected,8) != 0)
+ {
+ prnlog("Error with hash1!");
+ printarr("calculated", k, 8);
+ printarr("expected", expected, 8);
+ return 1;
+ }
+ return 0;
+}
int testElite()
{
prnlog("[+] Testing iClass Elite functinality...");
- prnlog("[+] Testing key diversification ...");
+ prnlog("[+] Testing hash2");
+ uint8_t k_cus[8] = {0x5B,0x7C,0x62,0xC4,0x91,0xC1,0x1B,0x39};
+
+ /**
+ *Expected:
+ * High Security Key Table
+
+00 F1 35 59 A1 0D 5A 26 7F 18 60 0B 96 8A C0 25 C1
+10 BF A1 3B B0 FF 85 28 75 F2 1F C6 8F 0E 74 8F 21
+20 14 7A 55 16 C8 A9 7D B3 13 0C 5D C9 31 8D A9 B2
+30 A3 56 83 0F 55 7E DE 45 71 21 D2 6D C1 57 1C 9C
+40 78 2F 64 51 42 7B 64 30 FA 26 51 76 D3 E0 FB B6
+50 31 9F BF 2F 7E 4F 94 B4 BD 4F 75 91 E3 1B EB 42
+60 3F 88 6F B8 6C 2C 93 0D 69 2C D5 20 3C C1 61 95
+70 43 08 A0 2F FE B3 26 D7 98 0B 34 7B 47 70 A0 AB
+
+
+
+**** The 64-bit HS Custom Key Value = 5B7C62C491C11B39 ****
+ */
+ uint8_t keytable[128] = {0};
+ hash2(k_cus, keytable);
+ printarr_human_readable("Hash2", keytable, 128);
+ if(keytable[3] == 0xA1 && keytable[0x30] == 0xA3 && keytable[0x6F] == 0x95)
+ {
+ prnlog("[+] Hash2 looks fine...");
+ }
int errors = 0 ;
- errors +=_test_iclass_key_permutation();
+ prnlog("[+] Testing hash1...");
+ errors += _testHash1();
+ prnlog("[+] Testing key diversification ...");
+ errors +=_test_iclass_key_permutation();
errors += _testBruteforce();
+
return errors;
}
projects / proxmark3-svn / blobdiff