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annotate pirimei.c @ 59:3f38da3933c2

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Pirelli's IMEI obfuscation cracked!
author Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
date Fri, 29 Nov 2013 00:39:02 +0000
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children
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59
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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1 /*
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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2 * This program recovers the IMEI of a Pirelli DP-L10 phone from a dump of
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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3 * its factory block (last 64 KiB sector of the 2nd flash chip select) and
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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4 * the corresponding dieid file as written by fc-loadtool.
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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5 *
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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6 * The location of the 16-byte encrypted IMEI record within the factory block
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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7 * (at offset 0x504) has been figured out with the help of the factdiff.c
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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8 * program, and the magic decryption & verification algorithm has been found in
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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9 * g23m/condat/com/src/comlib/cl_imei.c in the Leonardo semi-src by Sotovik.
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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10 */
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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11
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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12 #include <sys/types.h>
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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13 #include <openssl/des.h>
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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14 #include <ctype.h>
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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15 #include <stdio.h>
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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16 #include <stdlib.h>
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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17
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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18 DES_cblock ciphertext[2], dieid_key, decrypted[2];
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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19 DES_key_schedule keysched;
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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20
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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21 read_ciphertext(filename)
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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22 char *filename;
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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23 {
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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24 FILE *f;
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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25
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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26 f = fopen(filename, "r");
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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27 if (!f) {
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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28 perror(filename);
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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29 exit(1);
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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30 }
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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31 fseek(f, 0x504L, 0);
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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32 fread(ciphertext, 8, 2, f);
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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33 fclose(f);
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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34 }
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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35
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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36 decode_hexdigit(ch)
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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37 {
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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38 if (isdigit(ch))
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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39 return(ch - '0');
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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40 else if (isalpha(ch))
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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41 return(ch - 'A' + 10);
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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42 else
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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43 return(ch - 'a' + 10);
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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44 }
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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45
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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46 read_dieid_file(filename)
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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47 char *filename;
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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48 {
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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49 FILE *f;
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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50 int i;
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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51 char lb[64];
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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52
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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53 f = fopen(filename, "r");
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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54 if (!f) {
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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55 perror(filename);
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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56 exit(1);
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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57 }
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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58 for (i = 0; i < 4; i++) {
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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59 fgets(lb, sizeof lb, f);
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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60 if (!isxdigit(lb[0]) || !isxdigit(lb[1]) || !isxdigit(lb[2]) ||
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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61 !isxdigit(lb[3]) || !isxdigit(lb[4]) || !isxdigit(lb[5]) ||
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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62 !isxdigit(lb[6]) || !isxdigit(lb[7]) ||
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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63 lb[8] != ':' || lb[9] != ' ' ||
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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64 !isxdigit(lb[10]) || !isxdigit(lb[11]) ||
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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65 !isxdigit(lb[12]) || !isxdigit(lb[13]) || lb[14] != '\n') {
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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66 fprintf(stderr, "%s, line %d: differs from expected\n",
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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67 filename, i + 1);
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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68 exit(1);
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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69 }
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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70 dieid_key[i*2] = (decode_hexdigit(lb[12]) << 4) |
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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71 decode_hexdigit(lb[13]);
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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72 dieid_key[i*2+1] = 0;
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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73 }
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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74 fclose(f);
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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75 }
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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76
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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77 print_des_cblock(msg, blk)
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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78 char *msg;
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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79 DES_cblock blk;
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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80 {
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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81 printf("%s: %02X %02X %02X %02X %02X %02X %02X %02X\n", msg,
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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82 blk[0], blk[1], blk[2], blk[3], blk[4], blk[5], blk[6], blk[7]);
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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83 }
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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84
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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85 main(argc, argv)
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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86 char **argv;
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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87 {
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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88 if (argc != 3) {
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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89 fprintf(stderr, "usage: %s fact.bin dieid\n", argv[0]);
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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90 exit(1);
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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91 }
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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92 read_ciphertext(argv[1]);
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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93 read_dieid_file(argv[2]);
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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94 print_des_cblock("Key derived from die ID", &dieid_key);
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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95 print_des_cblock("Ciphertext block 1", &ciphertext[0]);
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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96 print_des_cblock("Ciphertext block 2", &ciphertext[1]);
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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97 DES_set_key_unchecked(&dieid_key, &keysched);
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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98 DES_ecb_encrypt(&ciphertext[0], &decrypted[0], &keysched, DES_DECRYPT);
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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99 print_des_cblock("1st decrypted block", &decrypted[0]);
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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100 DES_ecb_encrypt(&ciphertext[1], &decrypted[1], &keysched, DES_DECRYPT);
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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101 print_des_cblock("2nd decrypted block", &decrypted[1]);
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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102 exit(0);
3f38da3933c2 Pirelli's IMEI obfuscation cracked!
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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103 }