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comparison rvinterf/etmsync/pirimei.c @ 14:3d148edb87c2

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eliminated the dependency on OpenSSL for Pirelli IMEI DES decryption
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 03 Oct 2016 07:00:55 +0000
parents e7502631a0f9
children 6d9b10633f10
comparison
equal deleted inserted replaced
13:46ad66a231af 14:3d148edb87c2
1 /* 1 /*
2 * Reading and decryption of Pirelli's factory IMEI record 2 * Reading and decryption of Pirelli's factory IMEI record
3 */ 3 */
4 4
5 #include <sys/types.h> 5 #include <sys/types.h>
6 #include <openssl/des.h>
7 #include <stdio.h> 6 #include <stdio.h>
8 #include <stdlib.h> 7 #include <stdlib.h>
9 #include <string.h> 8 #include <string.h>
10 #include <strings.h> 9 #include <strings.h>
10 #include "cl_des.h"
11 #include "exitcodes.h" 11 #include "exitcodes.h"
12 12
13 u_char pirelli_imeisv[8]; 13 u_char pirelli_imeisv[8];
14 14
15 get_pirelli_imei() 15 get_pirelli_imei()
16 { 16 {
17 DES_cblock ciphertext[2], dieid_key, decrypted[2]; 17 u_char ciphertext[2][8], dieid_key[8], decrypted[2][8];
18 DES_key_schedule keysched;
19 int rc; 18 int rc;
20 static char failmsg[] = 19 static char failmsg[] =
21 "decryption failed: no valid IMEI record or incompatible firmware\n"; 20 "decryption failed: no valid IMEI record or incompatible firmware\n";
22 21
23 printf("Requesting Calypso die ID\n"); 22 printf("Requesting Calypso die ID\n");
26 return(rc); 25 return(rc);
27 printf("Reading IMEI record in Pirelli's factory data block\n"); 26 printf("Reading IMEI record in Pirelli's factory data block\n");
28 rc = do_memory_read(0x027F0504, ciphertext, 16); 27 rc = do_memory_read(0x027F0504, ciphertext, 16);
29 if (rc) 28 if (rc)
30 return(rc); 29 return(rc);
31 DES_set_key_unchecked(&dieid_key, &keysched); 30 cl_des(ciphertext[0], dieid_key, decrypted[0], CL_DES_DECRYPTION);
32 DES_ecb_encrypt(&ciphertext[0], &decrypted[0], &keysched, DES_DECRYPT); 31 cl_des(ciphertext[1], dieid_key, decrypted[1], CL_DES_DECRYPTION);
33 DES_ecb_encrypt(&ciphertext[1], &decrypted[1], &keysched, DES_DECRYPT);
34 if (bcmp(decrypted[1], dieid_key, 8)) { 32 if (bcmp(decrypted[1], dieid_key, 8)) {
35 printf(failmsg); 33 printf(failmsg);
36 return(ERROR_TARGET); 34 return(ERROR_TARGET);
37 } 35 }
38 bcopy(decrypted[0], pirelli_imeisv, 8); 36 bcopy(decrypted[0], pirelli_imeisv, 8);