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annotate imeibrute.c @ 92:708f2452d1ae

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armdis: full ldr/str decoding implemented
author Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
date Sun, 30 Mar 2014 01:47:28 +0000
parents 1e797f846563
children
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1 /*
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2 * The IMEI "protection" implemented by TI for Calypso (as opposed to Calypso+
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3 * or LoCosto) platforms for those device manufs who desired to obfuscate their
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4 * IMEIs (not everyone did - Openmoko opted out, for example), as seen in
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5 * g23m/condat/com/src/comlib/cl_imei.c in the Leonardo semi-src by Sotovik,
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6 * encrypts the IMEI using plain DES, using a key derived from the Calypso die
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7 * ID. However, only 28 effective key bits are used, and the key is then also
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8 * encrypted with itself and stored right after the encrypted IMEI, and is used
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9 * by the decryption & verification routine. Per TI's source, the 16-byte
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10 * encrypted IMEI record is to be stored in FFS in /gsm/imei.enc; the DP-L10
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11 * phone by Pirelli/Foxconn has been found to use the same scheme, but store
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12 * the 16-byte record in question in their "factory block" instead, at absolute
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13 * address 0x027F0504 as seen by the ARM7 CPU.
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14 *
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15 * The encryption scheme seems so weak to me (28 effective key bits and an easy
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16 * hit detection criterion for a brute force cracker) that I decided to see,
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17 * just for fun, how long it would take to crack that encryption by brute force
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18 * alone, and using a totally non-optimized program to do that.
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19 */
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20
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21 #include <sys/types.h>
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22 #include <openssl/des.h>
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23 #include <stdio.h>
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24 #include <stdlib.h>
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25
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26 DES_cblock ciphertext[2], dieid_key, decrypted[2];
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27 DES_key_schedule keysched;
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28
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29 read_ciphertext(filename, offset_arg)
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30 char *filename, *offset_arg;
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31 {
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32 FILE *f;
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33 u_long offset_val;
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34
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35 f = fopen(filename, "r");
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36 if (!f) {
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37 perror(filename);
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38 exit(1);
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39 }
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40 if (offset_arg) {
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41 offset_val = strtoul(offset_arg, 0, 16);
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42 fseek(f, offset_val, 0);
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43 }
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44 fread(ciphertext, 8, 2, f);
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45 fclose(f);
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46 }
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47
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48 print_des_cblock(msg, blk)
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49 char *msg;
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50 DES_cblock blk;
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51 {
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52 printf("%s: %02X %02X %02X %02X %02X %02X %02X %02X\n", msg,
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53 blk[0], blk[1], blk[2], blk[3], blk[4], blk[5], blk[6], blk[7]);
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54 }
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55
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56 try()
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57 {
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58 DES_set_key_unchecked(&dieid_key, &keysched);
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59 DES_ecb_encrypt(&ciphertext[1], &decrypted[1], &keysched, DES_DECRYPT);
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60 if (decrypted[1][0] & 0xFE != dieid_key[0])
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61 return;
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62 if (decrypted[1][1])
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63 return;
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64 if (decrypted[1][2] & 0xFE != dieid_key[2])
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65 return;
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66 if (decrypted[1][3])
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67 return;
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68 if (decrypted[1][4] & 0xFE != dieid_key[4])
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69 return;
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70 if (decrypted[1][5])
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71 return;
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72 if (decrypted[1][6] & 0xFE != dieid_key[6])
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73 return;
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74 if (decrypted[1][7])
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75 return;
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76 print_des_cblock("Hit", &decrypted[1]);
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77 DES_ecb_encrypt(&ciphertext[0], &decrypted[0], &keysched, DES_DECRYPT);
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78 print_des_cblock("IMEI", &decrypted[0]);
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79 }
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80
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81 main(argc, argv)
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82 char **argv;
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83 {
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84 if (argc < 2 || argc > 3) {
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85 fprintf(stderr, "usage: %s binfile [offset]\n", argv[0]);
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86 exit(1);
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87 }
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88 read_ciphertext(argv[1], argv[2]);
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89 dieid_key[1] = 0;
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90 dieid_key[3] = 0;
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91 dieid_key[5] = 0;
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92 dieid_key[7] = 0;
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93 for (dieid_key[0] = 0; dieid_key[0] <= 0xFE; dieid_key[0] += 2)
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94 for (dieid_key[2] = 0; dieid_key[2] <= 0xFE; dieid_key[2] += 2)
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95 for (dieid_key[4] = 0; dieid_key[4] <= 0xFE; dieid_key[4] += 2)
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96 for (dieid_key[6] = 0; dieid_key[6] <= 0xFE; dieid_key[6] += 2)
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97 try();
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98 exit(0);
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99 }