FreeCalypso > hg > freecalypso-reveng

annotate miscprog/imeibrute.c @ 302:844ebeb9a5c6

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
dsample-fw-disasm: rf_program() and l1dmacro_agc() analysed
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 05 Oct 2019 23:47:32 +0000
parents 597143ba1c37
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
60
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
1 /*
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
2 * The IMEI "protection" implemented by TI for Calypso (as opposed to Calypso+
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
3 * or LoCosto) platforms for those device manufs who desired to obfuscate their
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
4 * IMEIs (not everyone did - Openmoko opted out, for example), as seen in
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
5 * g23m/condat/com/src/comlib/cl_imei.c in the Leonardo semi-src by Sotovik,
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
6 * encrypts the IMEI using plain DES, using a key derived from the Calypso die
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
7 * ID. However, only 28 effective key bits are used, and the key is then also
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
8 * encrypted with itself and stored right after the encrypted IMEI, and is used
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
9 * by the decryption & verification routine. Per TI's source, the 16-byte
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
10 * encrypted IMEI record is to be stored in FFS in /gsm/imei.enc; the DP-L10
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
11 * phone by Pirelli/Foxconn has been found to use the same scheme, but store
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
12 * the 16-byte record in question in their "factory block" instead, at absolute
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
13 * address 0x027F0504 as seen by the ARM7 CPU.
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
14 *
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
15 * The encryption scheme seems so weak to me (28 effective key bits and an easy
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
16 * hit detection criterion for a brute force cracker) that I decided to see,
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
17 * just for fun, how long it would take to crack that encryption by brute force
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
18 * alone, and using a totally non-optimized program to do that.
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
19 */
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
20
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
21 #include <sys/types.h>
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
22 #include <openssl/des.h>
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
23 #include <stdio.h>
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
24 #include <stdlib.h>
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
25
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
26 DES_cblock ciphertext[2], dieid_key, decrypted[2];
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
27 DES_key_schedule keysched;
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
28
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
29 read_ciphertext(filename, offset_arg)
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
30 char *filename, *offset_arg;
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
31 {
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
32 FILE *f;
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
33 u_long offset_val;
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
34
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
35 f = fopen(filename, "r");
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
36 if (!f) {
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
37 perror(filename);
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
38 exit(1);
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
39 }
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
40 if (offset_arg) {
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
41 offset_val = strtoul(offset_arg, 0, 16);
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
42 fseek(f, offset_val, 0);
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
43 }
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
44 fread(ciphertext, 8, 2, f);
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
45 fclose(f);
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
46 }
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
47
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
48 print_des_cblock(msg, blk)
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
49 char *msg;
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
50 DES_cblock blk;
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
51 {
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
52 printf("%s: %02X %02X %02X %02X %02X %02X %02X %02X\n", msg,
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
53 blk[0], blk[1], blk[2], blk[3], blk[4], blk[5], blk[6], blk[7]);
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
54 }
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
55
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
56 try()
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
57 {
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
58 DES_set_key_unchecked(&dieid_key, &keysched);
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
59 DES_ecb_encrypt(&ciphertext[1], &decrypted[1], &keysched, DES_DECRYPT);
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
60 if (decrypted[1][0] & 0xFE != dieid_key[0])
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
61 return;
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
62 if (decrypted[1][1])
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
63 return;
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
64 if (decrypted[1][2] & 0xFE != dieid_key[2])
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
65 return;
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
66 if (decrypted[1][3])
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
67 return;
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
68 if (decrypted[1][4] & 0xFE != dieid_key[4])
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
69 return;
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
70 if (decrypted[1][5])
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
71 return;
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
72 if (decrypted[1][6] & 0xFE != dieid_key[6])
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
73 return;
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
74 if (decrypted[1][7])
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
75 return;
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
76 print_des_cblock("Hit", &decrypted[1]);
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
77 DES_ecb_encrypt(&ciphertext[0], &decrypted[0], &keysched, DES_DECRYPT);
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
78 print_des_cblock("IMEI", &decrypted[0]);
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
79 }
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
80
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
81 main(argc, argv)
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
82 char **argv;
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
83 {
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
84 if (argc < 2 || argc > 3) {
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
85 fprintf(stderr, "usage: %s binfile [offset]\n", argv[0]);
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
86 exit(1);
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
87 }
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
88 read_ciphertext(argv[1], argv[2]);
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
89 dieid_key[1] = 0;
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
90 dieid_key[3] = 0;
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
91 dieid_key[5] = 0;
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
92 dieid_key[7] = 0;
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
93 for (dieid_key[0] = 0; dieid_key[0] <= 0xFE; dieid_key[0] += 2)
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
94 for (dieid_key[2] = 0; dieid_key[2] <= 0xFE; dieid_key[2] += 2)
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
95 for (dieid_key[4] = 0; dieid_key[4] <= 0xFE; dieid_key[4] += 2)
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
96 for (dieid_key[6] = 0; dieid_key[6] <= 0xFE; dieid_key[6] += 2)
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
97 try();
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
98 exit(0);
1e797f846563 imeibrute written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
99 }