forked from len0rd/rockbox
nwztools: cleanup the code
There was a lot of copy and paste, and the code was just crap. This commit tries to clarify the code and also document the encryption procedure. Hopefully I didn't break anything. Change-Id: I257793010e7cf94f2b090b30bb8608359d3886e3
This commit is contained in:
Amaury Pouly
parent
de8950d63d
commit
cf82f208e3
6 changed files with 291 additions and 298 deletions
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@ -28,8 +28,9 @@ extern "C" {
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#endif
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#define NWZ_KAS_SIZE 32
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#define NWZ_KEYSIG_SIZE 51
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#define NWZ_KEYSIG_SIZE 16
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#define NWZ_KEY_SIZE 8
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#define NWZ_SIG_SIZE 8
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#define NWZ_EXPKEY_SIZE (NWZ_KEY_SIZE * NWZ_KEY_SIZE)
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#define NWZ_DES_BLOCK 8
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@ -22,8 +22,24 @@
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#include "misc.h"
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#include "mg.h"
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#include <string.h>
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#include <stdio.h>
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#define HEX_MAJ
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/* Key search methods
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*
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* This code tries to find the key and signature of a device using an upgrade
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* file. It more or less relies on brute force and makes the following assumptions.
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* It assumes the key and the signature are hexadecimal strings (it appears to be
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* true thus far). The code lists all possible keys and decrypts the first
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* 8 bytes of the file. If the decrypted signature happens to be an hex string,
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* the code reports the key and signature as potentially valid. Note that some
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* key/sig pairs may not be valid but since the likelyhood of decrypting a
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* random 8-byte sequence using an hex string key and to produce an hex string
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* is very small, there should be almost no false positive.
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*
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* Since the key is supposedly random, the code starts by looking at "balanced"
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* keys: keys with slightly more digits (0-9) than letters (a-f) and then moving
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* towards very unbalanced strings (only digits or only letters).
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*/
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static uint8_t g_cipher[8];
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static keysig_notify_fn_t g_notify;
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@ -31,11 +47,10 @@ static uint8_t g_key[8];
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static void *g_user;
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static bool is_hex[256];
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static bool is_init = false;
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#ifdef HEX_MAJ
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static char hex_digits[] = "02468ABEF";
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#else
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static char hex_digits[] = "02468abef";
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#endif
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static uint64_t g_tot_count;
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static uint64_t g_cur_count;
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static int g_last_percent;
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static int g_last_subpercent;
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static void keysig_search_init()
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{
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@ -44,11 +59,7 @@ static void keysig_search_init()
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memset(is_hex, 0, sizeof(is_hex));
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for(int i = '0'; i <= '9'; i++)
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is_hex[i] = true;
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#ifdef HEX_MAJ
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for(int i = 'A'; i <= 'F'; i++)
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#else
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for(int i = 'a'; i <= 'f'; i++)
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#endif
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is_hex[i] = true;
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}
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@ -63,6 +74,24 @@ static inline bool is_full_ascii(uint8_t *arr)
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static inline bool check_stupid()
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{
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uint8_t res[8];
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// display progress
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g_cur_count++;
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int percent = (g_cur_count * 100ULL) / g_tot_count;
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int subpercent = ((g_cur_count * 1000ULL) / g_tot_count) % 10;
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if(percent != g_last_percent)
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{
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cprintf(RED, "%d%%", percent);
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fflush(stdout);
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g_last_subpercent = 0;
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}
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if(subpercent != g_last_subpercent)
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{
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cprintf(WHITE, ".");
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fflush(stdout);
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}
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g_last_percent = percent;
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g_last_subpercent = subpercent;
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mg_decrypt_fw(g_cipher, 8, res, g_key);
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if(is_full_ascii(res))
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return g_notify(g_user, g_key, res);
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@ -75,7 +104,7 @@ static bool search_stupid_rec(int rem_digit, int rem_letter, int pos)
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return check_stupid();
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if(rem_digit > 0)
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{
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for(int i = '0'; i <= '9'; i += 2)
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for(int i = '0'; i <= '9'; i++)
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{
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g_key[pos] = i;
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if(search_stupid_rec(rem_digit - 1, rem_letter, pos + 1))
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@ -84,11 +113,7 @@ static bool search_stupid_rec(int rem_digit, int rem_letter, int pos)
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}
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if(rem_letter > 0)
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{
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#ifdef HEX_MAJ
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for(int i = 'a' - 1; i <= 'f'; i += 2)
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#else
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for(int i = 'A' - 1; i <= 'F'; i += 2)
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#endif
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for(int i = 'a' - 1; i <= 'f'; i++)
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{
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g_key[pos] = i;
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if(search_stupid_rec(rem_digit, rem_letter - 1, pos + 1))
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@ -100,6 +125,12 @@ static bool search_stupid_rec(int rem_digit, int rem_letter, int pos)
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static bool search_stupid(int rem_digit, int rem_letter)
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{
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cprintf(WHITE, "\n Looking for keys with ");
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cprintf(RED, "%d", rem_digit);
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cprintf(WHITE, " digits and ");
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cprintf(RED, "%d", rem_letter);
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cprintf(WHITE, " letters...");
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fflush(stdout);
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return search_stupid_rec(rem_digit, rem_letter, 0);
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}
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@ -109,28 +140,35 @@ bool keysig_search_ascii_stupid(uint8_t *cipher, keysig_notify_fn_t notify, void
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memcpy(g_cipher, cipher, 8);
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g_notify = notify;
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g_user = user;
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#if 1
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return search_stupid(4, 4) ||
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search_stupid(3, 5) || search_stupid(5, 3) ||
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search_stupid(2, 6) || search_stupid(6, 2) ||
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search_stupid(1, 7) || search_stupid(7, 1) ||
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search_stupid(0, 8) || search_stupid(8, 0);
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#else
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#define do(i) for(int a##i = 0; a##i < sizeof(hex_digits); a##i++) { g_key[i] = hex_digits[a##i];
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#define od() }
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do(0)do(1)do(2)do(3)do(4)do(5)do(6)do(7)
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if(check_stupid()) return true;
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od()od()od()od()od()od()od()od()
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#undef do
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#undef od
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return false;
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#endif
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// compute number of possibilities
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g_cur_count = 0;
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g_tot_count = 1;
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g_last_percent = -1;
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for(int i = 0; i < 8; i++)
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g_tot_count *= 16ULL;
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cprintf(WHITE, " Search space:");
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cprintf(RED, " %llu", (unsigned long long)g_tot_count);
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// sorted by probability:
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bool ret = search_stupid(5, 3) // 5 digits, 3 letters: 0.281632
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|| search_stupid(6, 2) // 6 digits, 2 letters: 0.234693
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|| search_stupid(4, 4) // 4 digits, 4 letters: 0.211224
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|| search_stupid(7, 1) // 7 digits, 1 letters: 0.111759
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|| search_stupid(3, 5) // 3 digits, 5 letters: 0.101388
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|| search_stupid(2, 6) // 2 digits, 6 letters: 0.030416
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|| search_stupid(8, 0) // 8 digits, 0 letters: 0.023283
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|| search_stupid(1, 7) // 1 digits, 7 letters: 0.005214
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|| search_stupid(0, 8);// 0 digits, 8 letters: 0.000391
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cprintf(OFF, "\n");
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return ret;
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}
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bool keysig_search_ascii_brute(uint8_t *cipher, keysig_notify_fn_t notify, void *user)
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{
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(void) cipher;
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(void) notify;
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(void) user;
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keysig_search_init();
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cprintf(RED, "Unimplemented\n");
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return false;
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}
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@ -144,9 +182,9 @@ struct keysig_search_desc_t keysig_search_desc[KEYSIG_SEARCH_LAST] =
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},
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[KEYSIG_SEARCH_ASCII_STUPID] =
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{
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.name = "ascii-stupid",
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.name = "ascii-hex",
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.fn = keysig_search_ascii_stupid,
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.comment = "Try to find a balance ascii key ignoring lsb"
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.comment = "Try to find an hexadecimal ascii string keysig"
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},
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[KEYSIG_SEARCH_ASCII_BRUTE] =
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{
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@ -23,6 +23,7 @@
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#include <stdbool.h>
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#include <stdint.h>
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#include "fwp.h"
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enum keysig_search_method_t
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{
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@ -34,7 +35,8 @@ enum keysig_search_method_t
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};
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/* notify returns true if the key seems ok */
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typedef bool (*keysig_notify_fn_t)(void *user, uint8_t key[8], uint8_t sig[8]);
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typedef bool (*keysig_notify_fn_t)(void *user, uint8_t key[NWZ_KEY_SIZE],
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uint8_t sig[NWZ_SIG_SIZE]);
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/* returns true if a key was accepted by notify */
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typedef bool (*keysig_search_fn_t)(uint8_t *cipher, keysig_notify_fn_t notify, void *user);
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@ -31,6 +31,7 @@ char RED[] = { 0x1b, 0x5b, 0x31, 0x3b, '3', '1', 0x6d, '\0' };
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char GREEN[] = { 0x1b, 0x5b, 0x31, 0x3b, '3', '2', 0x6d, '\0' };
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char YELLOW[] = { 0x1b, 0x5b, 0x31, 0x3b, '3', '3', 0x6d, '\0' };
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char BLUE[] = { 0x1b, 0x5b, 0x31, 0x3b, '3', '4', 0x6d, '\0' };
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char WHITE[] = { 0x1b, 0x5b, 0x31, 0x3b, '3', '7', 0x6d, '\0' };
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static bool g_color_enable = true;
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@ -34,7 +34,7 @@
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typedef char color_t[];
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extern color_t OFF, GREY, RED, GREEN, YELLOW, BLUE;
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extern color_t OFF, GREY, RED, GREEN, YELLOW, BLUE, WHITE;
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void *xmalloc(size_t s);
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void color(color_t c);
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void enable_color(bool enable);
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@ -69,9 +69,9 @@ struct nwz_model_t
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{
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const char *model;
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unsigned flags;
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char kas[NWZ_KAS_SIZE]; /* key and signature */
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char key[8];
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char sig[8];
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char *kas;
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char *key;
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char *sig;
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};
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struct upg_md5_t
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@ -81,7 +81,7 @@ struct upg_md5_t
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struct upg_header_t
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{
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char sig[8];
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char sig[NWZ_SIG_SIZE];
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uint32_t nr_files;
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uint32_t pad; // make sure structure size is a multiple of 8
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} __attribute__((packed));
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@ -92,6 +92,72 @@ struct upg_entry_t
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uint32_t size;
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} __attribute__((packed));
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/** KAS / Key / Signature
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*
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* Since this is all very confusing, we need some terminology and notations:
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* - [X, Y, Z] is a sequence of bytes, for example:
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* [8, 0x89, 42]
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* is a sequence of three bytes.
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* - "abcdef" is a string: it is a sequences of bytes where each byte happens to
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* be the ASCII encoding of a letter. So for example:
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* "abc" = [97, 98, 99]
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* because 'a' has ASCII encoding 97 and so one
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* - HexString(Seq) refers to the string where each byte of the original sequence
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* is represented in hexadecimal by two ASCII characters. For example:
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* HexString([8, 0x89, 42]) = "08892a"
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* because 8 = 0x08 so it represented by "08" and 42 = 0x2a. Note that the length
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* of HexString(Seq) is always exactly twice the length of Seq.
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* - DES(Seq,Pass) is the result of encrypting Seq with Pass using the DES cipher.
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* Seq must be a sequence of 8 bytes (known as a block) and Pass must be a
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* sequence of 8 bytes. The result is also a 8-byte sequence.
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* - ECB_DES([Block0, Block1, ..., BlockN], Pass)
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* = [DES(Block0,Pass), DES(Block1,Pass), ..., DES(BlockN,Pass)]
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* where Blocki is a block (8 byte).
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*
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*
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* A firmware upgrade file is always encrypted using a Key. To authenticate it,
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* the upgrade file (before encryption) contains a Sig(nature). The pair (Key,Sig)
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* is refered to as KeySig and is specific to each series. For example all
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* NWZ-E46x use the same KeySig but the NWZ-E46x and NWZ-A86x use different KeySig.
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* In the details, a Key is a sequence of 8 bytes and a Sig is also a sequence
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* of 8 bytes. A KeySig is a simply the concatenation of the Key followed by
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* the Sig, so it is a sequence of 16 bytes. Probably in an attempt to obfuscate
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* things a little further, Sony never provides the KeySig directly but instead
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* encrypts it using DES in ECB mode using a hardcoded password and provides
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* the hexadecimal string of the result, known as the KAS, which is thus a string
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* of 32 ASCII characters.
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* Note that since DES works on blocks of 8 bytes and ECB encrypts blocks
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* independently, it is the same to encrypt the KeySig as once or encrypt the Key
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* and Sig separately.
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*
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* To summarize:
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* Key = [K0, K1, K2, ..., K7] (8 bytes) (model specific)
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* Sig = [S0, S1, S2, ..., S7] (8 bytes) (model specific)
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* KeySig = [Key, Sig] = [K0, ... K7, S0, ..., S7] (16 bytes)
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* FwpPass = "ed295076" (8 bytes) (never changes)
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* EncKeySig = ECB_DES(KeySig, FwpPass) = [DES(Key, FwpPass), DES(Sig, FwpPass)]
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* KAS = HexString(EncKeySig) (32 characters)
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*
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* In theory, the Key and Sig can be any 8-byte sequence. In practice, they always
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* are strings, probably to make it easier to write them down. In many cases, the
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* Key and Sig are even the hexadecimal string of 4-byte sequences but it is
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* unclear if this is the result of pure luck, confused engineers, lazyness on
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* Sony's part or by design. The following code assumes that Key and Sig are
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* strings (though it could easily be fixed to work with anything if this is
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* really needed).
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*
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*
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* Here is a real example, from the NWZ-E46x Series:
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* Key = "6173819e" (note that this is a string and even a hex string in this case)
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* Sig = "30b82e5c"
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* KeySig = [Key, Sig] = "6173819e30b82e5c"
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* FwpPass = "ed295076" (never changes)
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* EncKeySig = ECB_DES(KeySig, FwpPass)
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* = [0x8a, 0x01, 0xb6, ..., 0xc5] (16 bytes)
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* KAS = HexString(EncKeySig) = "8a01b624bfbfde4a1662a1772220e3c5"
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*
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*/
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struct nwz_model_t g_model_list[] =
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{
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{ "nwz-e45x", HAS_KAS | HAS_KEY | HAS_SIG | CONFIRMED, "8a01b624bfbfde4a1662a1772220e3c5", "6173819e", "30b82e5c"},
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@ -99,7 +165,7 @@ struct nwz_model_t g_model_list[] =
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{ "nwz-a86x", HAS_KAS | HAS_KEY | HAS_SIG | CONFIRMED, "a7c4af6c28b8900a783f307c1ba538c5", "c824e4e2", "7c262bb0" },
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/* The following keys were obtained by brute forcing firmware upgrades,
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* someone with a device needs to confirm that they work */
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{ "nw-a82x", HAS_KEY | HAS_SIG, {""}, "4df06482", "07fa0b6e" },
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{ "nw-a82x", HAS_KEY | HAS_SIG, "", "4df06482", "07fa0b6e" },
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};
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static int digit_value(char c)
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@ -115,15 +181,14 @@ static char hex_digit(unsigned v)
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return (v < 10) ? v + '0' : (v < 16) ? v - 10 + 'a' : 'x';
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}
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static int decrypt_keysig(char keysig[NWZ_KEYSIG_SIZE])
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static int decrypt_keysig(const char kas[NWZ_KAS_SIZE], char key[NWZ_KEY_SIZE],
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char sig[NWZ_SIG_SIZE])
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{
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uint8_t src[16];
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for(int i = 32; i < NWZ_KEYSIG_SIZE; i++)
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keysig[i] = 0;
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for(int index = 0; index < 16; index++)
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uint8_t src[NWZ_KAS_SIZE / 2];
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for(int index = 0; index < NWZ_KAS_SIZE / 2; index++)
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{
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int a = digit_value(keysig[index * 2]);
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int b = digit_value(keysig[index * 2 + 1]);
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int a = digit_value(kas[index * 2]);
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int b = digit_value(kas[index * 2 + 1]);
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if(a < 0 || b < 0)
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{
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cprintf(GREY, "Invalid KAS !\n");
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@ -133,18 +198,137 @@ static int decrypt_keysig(char keysig[NWZ_KEYSIG_SIZE])
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}
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fwp_setkey("ed295076");
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fwp_crypt(src, sizeof(src), 1);
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memcpy(keysig + 33, src, 8);
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memcpy(keysig + 42, src + 8, 8);
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memcpy(key, src, NWZ_KEY_SIZE);
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memcpy(sig, src + NWZ_KEY_SIZE, NWZ_SIG_SIZE);
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return 0;
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}
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static bool upg_notify_keysig(void *user, uint8_t key[8], uint8_t sig[8])
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static void encrypt_keysig(char kas[NWZ_KEY_SIZE],
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const char key[NWZ_SIG_SIZE], const char sig[NWZ_KAS_SIZE])
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{
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memcpy(user + 33, key, 8);
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memcpy(user + 42, sig, 8);
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uint8_t src[NWZ_KAS_SIZE / 2];
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fwp_setkey("ed295076");
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memcpy(src, key, NWZ_KEY_SIZE);
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memcpy(src + NWZ_KEY_SIZE, sig, NWZ_SIG_SIZE);
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fwp_crypt(src, sizeof(src), 0);
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for(int i = 0; i < NWZ_KAS_SIZE / 2; i++)
|
||||
{
|
||||
kas[2 * i] = hex_digit((src[i] >> 4) & 0xf);
|
||||
kas[2 * i + 1] = hex_digit(src[i] & 0xf);
|
||||
}
|
||||
}
|
||||
|
||||
/* user needs to be pointer to a NWZ_KEYSIG_SIZE-byte buffer, on success g_key
|
||||
* and g_sig are updated to point to the key and sig in the buffer */
|
||||
static bool upg_notify_keysig(void *user, uint8_t key[NWZ_KEY_SIZE],
|
||||
uint8_t sig[NWZ_SIG_SIZE])
|
||||
{
|
||||
g_key = user;
|
||||
g_sig = user + NWZ_KEY_SIZE;
|
||||
memcpy(g_key, key, NWZ_KEY_SIZE);
|
||||
memcpy(g_sig, sig, NWZ_SIG_SIZE);
|
||||
return true;
|
||||
}
|
||||
|
||||
static int get_key_and_sig(bool is_extract, void *encrypted_hdr)
|
||||
{
|
||||
static char keysig[NWZ_KEYSIG_SIZE];
|
||||
static char kas[NWZ_KAS_SIZE];
|
||||
/* database lookup */
|
||||
if(g_model_index != -1)
|
||||
{
|
||||
if(g_model_list[g_model_index].flags & HAS_KAS)
|
||||
g_kas = g_model_list[g_model_index].kas;
|
||||
if(g_model_list[g_model_index].flags & HAS_KEY)
|
||||
g_key = g_model_list[g_model_index].key;
|
||||
if(g_model_list[g_model_index].flags & HAS_SIG)
|
||||
g_sig = g_model_list[g_model_index].sig;
|
||||
}
|
||||
|
||||
/* always prefer KAS because it contains everything */
|
||||
if(g_kas)
|
||||
{
|
||||
if(strlen(g_kas) != NWZ_KAS_SIZE)
|
||||
{
|
||||
cprintf(GREY, "The KAS has wrong length (must be %d hex digits)\n", NWZ_KAS_SIZE);
|
||||
return 4;
|
||||
}
|
||||
g_key = keysig;
|
||||
g_sig = keysig + NWZ_KEY_SIZE;
|
||||
decrypt_keysig(g_kas, g_key, g_sig);
|
||||
}
|
||||
/* fall back to key and signature otherwise. The signature is not required
|
||||
* when extracting but prevents from checking decryption */
|
||||
else if(g_key && (is_extract || g_sig))
|
||||
{
|
||||
if(strlen(g_key) != 8)
|
||||
{
|
||||
cprintf(GREY, "The specified key has wrong length (must be 8 hex digits)\n");
|
||||
return 4;
|
||||
}
|
||||
|
||||
/* if there is a signature, it must have the correct size */
|
||||
if(g_sig)
|
||||
{
|
||||
if(strlen(g_sig) != 8)
|
||||
{
|
||||
cprintf(GREY, "The specified sig has wrong length (must be 8 hex digits)\n");
|
||||
return 5;
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
cprintf(GREY, "Warning: you have specified a key but no sig, I won't be able to do any checks\n");
|
||||
}
|
||||
}
|
||||
/* for extraction, we offer a brute force search method from the MD5 */
|
||||
else if(is_extract && g_keysig_search != KEYSIG_SEARCH_NONE)
|
||||
{
|
||||
cprintf(BLUE, "keysig Search\n");
|
||||
cprintf_field(" Method: ", "%s\n", keysig_search_desc[g_keysig_search].name);
|
||||
bool ok = keysig_search_desc[g_keysig_search].fn(encrypted_hdr, &upg_notify_keysig, keysig);
|
||||
cprintf(GREEN, " Result: ");
|
||||
cprintf(ok ? YELLOW : RED, "%s\n", ok ? "Key found" : "No key found");
|
||||
if(!ok)
|
||||
return 2;
|
||||
}
|
||||
else
|
||||
{
|
||||
cprintf(GREY, "A KAS or a keysig is needed to decrypt the firmware\n");
|
||||
cprintf(GREY, "You have the following options(see help for more details):\n");
|
||||
cprintf(GREY, "- select a model with a known KAS\n");
|
||||
cprintf(GREY, "- specify an explicit KAS or key+sig\n");
|
||||
if(is_extract)
|
||||
cprintf(GREY, "- let me try to find the keysig(slow !)\n");
|
||||
return 1;
|
||||
}
|
||||
|
||||
/* If we only have the key and signature, we can create a "fake" KAS
|
||||
* that decrypts to the same key and signature. Since it is not unique,
|
||||
* it will generally not match the "official" one from Sony but will produce
|
||||
* valid files anyway */
|
||||
if(!g_kas)
|
||||
{
|
||||
if(!g_sig)
|
||||
{
|
||||
/* if we extract and don't have a signature, just use a random
|
||||
* one, we cannot check it anyway */
|
||||
g_sig = keysig;
|
||||
memset(g_sig, '?', NWZ_SIG_SIZE);
|
||||
}
|
||||
g_kas = kas;
|
||||
encrypt_keysig(g_kas, g_key, g_sig);
|
||||
}
|
||||
|
||||
cprintf(BLUE, "Keys\n");
|
||||
cprintf_field(" KAS: ", "%."STR(NWZ_KAS_SIZE)"s\n", g_kas);
|
||||
cprintf_field(" Key: ", "%."STR(NWZ_KEY_SIZE)"s\n", g_key);
|
||||
if(g_sig)
|
||||
cprintf_field(" Sig: ", "%."STR(NWZ_SIG_SIZE)"s\n", g_sig);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int do_upg(void *buf, long size)
|
||||
{
|
||||
struct upg_md5_t *md5 = buf;
|
||||
|
|
@ -163,136 +347,12 @@ static int do_upg(void *buf, long size)
|
|||
}
|
||||
check_field(memcmp(actual_md5, md5->md5, 16), 0, "Ok\n", "Mismatch\n");
|
||||
|
||||
if(g_model_index == -1 && g_keysig_search == KEYSIG_SEARCH_NONE && g_key == NULL && g_kas == NULL)
|
||||
{
|
||||
cprintf(GREY, "A KAS or a keysig is needed to decrypt the firmware\n");
|
||||
cprintf(GREY, "You have the following options(see help for more details):\n");
|
||||
cprintf(GREY, "- select a model with a known KAS\n");
|
||||
cprintf(GREY, "- specify an explicit KAS or key(+optional sig)\n");
|
||||
cprintf(GREY, "- let me try to find the keysig(slow !)\n");
|
||||
return 1;
|
||||
}
|
||||
|
||||
char kas[NWZ_KAS_SIZE];
|
||||
char keysig[NWZ_KEYSIG_SIZE];
|
||||
|
||||
memset(kas, '?', NWZ_KAS_SIZE);
|
||||
memset(keysig, '?', NWZ_KEYSIG_SIZE);
|
||||
keysig[32] = keysig[41] = keysig[50] = 0;
|
||||
|
||||
if(g_kas)
|
||||
{
|
||||
if(strlen(g_kas) != NWZ_KAS_SIZE)
|
||||
{
|
||||
cprintf(GREY, "The specified KAS has wrong length (must be %d hex digits)\n", NWZ_KAS_SIZE);
|
||||
return 4;
|
||||
}
|
||||
memcpy(keysig, g_kas, NWZ_KAS_SIZE);
|
||||
decrypt_keysig(keysig);
|
||||
g_kas = keysig;
|
||||
g_key = keysig + 33;
|
||||
g_sig = keysig + 42;
|
||||
}
|
||||
else if(g_key)
|
||||
{
|
||||
if(strlen(g_key) != 8)
|
||||
{
|
||||
cprintf(GREY, "The specified key has wrong length (must be 8 hex digits)\n");
|
||||
return 4;
|
||||
}
|
||||
if(g_sig && strlen(g_sig) != 8)
|
||||
{
|
||||
cprintf(GREY, "The specified sig has wrong length (must be 8 hex digits)\n");
|
||||
return 5;
|
||||
}
|
||||
|
||||
memcpy(keysig + 33, g_key, 8);
|
||||
if(!g_sig)
|
||||
cprintf(GREY, "Warning: you have specified a key but no sig, I won't be able to do any checks\n");
|
||||
else
|
||||
memcpy(keysig + 42, g_sig, 8);
|
||||
g_key = keysig + 33;
|
||||
if(g_sig)
|
||||
g_sig = keysig + 42;
|
||||
}
|
||||
else if(g_model_index == -1)
|
||||
{
|
||||
cprintf(BLUE, "keysig Search\n");
|
||||
cprintf_field(" Method: ", "%s\n", keysig_search_desc[g_keysig_search].name);
|
||||
bool ok = keysig_search_desc[g_keysig_search].fn((void *)(md5 + 1), &upg_notify_keysig, keysig);
|
||||
cprintf(GREEN, " Result: ");
|
||||
cprintf(ok ? YELLOW : RED, "%s\n", ok ? "Key found" : "No key found");
|
||||
if(!ok)
|
||||
return 2;
|
||||
g_key = keysig + 33;
|
||||
g_sig = keysig + 42;
|
||||
}
|
||||
else
|
||||
{
|
||||
if(g_model_list[g_model_index].flags & HAS_KAS)
|
||||
g_kas = g_model_list[g_model_index].kas;
|
||||
if(g_model_list[g_model_index].flags & HAS_KEY)
|
||||
g_key = g_model_list[g_model_index].key;
|
||||
if(g_model_list[g_model_index].flags & HAS_SIG)
|
||||
g_sig = g_model_list[g_model_index].sig;
|
||||
|
||||
if(g_kas)
|
||||
{
|
||||
memcpy(keysig, g_kas, NWZ_KAS_SIZE);
|
||||
decrypt_keysig(keysig);
|
||||
g_kas = keysig;
|
||||
g_key = keysig + 33;
|
||||
g_sig = keysig + 42;
|
||||
}
|
||||
else
|
||||
{
|
||||
if(g_key)
|
||||
{
|
||||
memcpy(keysig + 33, g_key, 8);
|
||||
g_key = keysig + 33;
|
||||
}
|
||||
if(g_sig)
|
||||
{
|
||||
memcpy(keysig + 42, g_sig, 8);
|
||||
g_sig = keysig + 42;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if(!g_kas)
|
||||
{
|
||||
g_kas = keysig;
|
||||
fwp_setkey("ed295076");
|
||||
if(g_key)
|
||||
{
|
||||
memcpy(kas, g_key, 8);
|
||||
fwp_crypt(kas, 8, 0);
|
||||
for(int i = 0; i < 8; i++)
|
||||
{
|
||||
g_kas[2 * i] = hex_digit((kas[i] >> 4) & 0xf);
|
||||
g_kas[2 * i + 1] = hex_digit(kas[i] & 0xf);
|
||||
}
|
||||
}
|
||||
if(g_sig)
|
||||
{
|
||||
memcpy(kas + 8, g_sig, 8);
|
||||
fwp_crypt(kas + 8, 8, 0);
|
||||
for(int i = 8; i < 16; i++)
|
||||
{
|
||||
g_kas[2 * i] = hex_digit((kas[i] >> 4) & 0xf);
|
||||
g_kas[2 * i + 1] = hex_digit(kas[i] & 0xf);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
cprintf(BLUE, "Keys\n");
|
||||
cprintf_field(" KAS: ", "%."STR(NWZ_KAS_SIZE)"s\n", g_kas);
|
||||
cprintf_field(" Key: ", "%s\n", g_key);
|
||||
if(g_sig)
|
||||
cprintf_field(" Sig: ", "%s\n", g_sig);
|
||||
int ret = get_key_and_sig(true, md5 + 1);
|
||||
if(ret != 0)
|
||||
return ret;
|
||||
|
||||
struct upg_header_t *hdr = (void *)(md5 + 1);
|
||||
int ret = fwp_read(hdr, sizeof(struct upg_header_t), hdr, (void *)g_key);
|
||||
ret = fwp_read(hdr, sizeof(struct upg_header_t), hdr, (void *)g_key);
|
||||
if(ret)
|
||||
return ret;
|
||||
|
||||
|
|
@ -336,7 +396,6 @@ static int do_upg(void *buf, long size)
|
|||
return ret;
|
||||
// but write the *good* amount of data
|
||||
fwrite(buf + entry->offset, 1, entry->size, f);
|
||||
|
||||
fclose(f);
|
||||
}
|
||||
else
|
||||
|
|
@ -414,118 +473,10 @@ static int create_upg(int argc, char **argv)
|
|||
printf("You must specify a firmware filename\n");
|
||||
usage();
|
||||
}
|
||||
|
||||
if(g_model_index == -1 && (g_key == NULL || g_sig == NULL) && g_kas == NULL)
|
||||
{
|
||||
cprintf(GREY, "A KAS or a keysig is needed to encrypt the firmware\n");
|
||||
cprintf(GREY, "You have the following options(see help for more details):\n");
|
||||
cprintf(GREY, "- select a model with a known KAS\n");
|
||||
cprintf(GREY, "- specify an explicit KAS or key+sig\n");
|
||||
return 1;
|
||||
}
|
||||
|
||||
char kas[NWZ_KAS_SIZE];
|
||||
char keysig[NWZ_KEYSIG_SIZE];
|
||||
|
||||
memset(kas, '?', NWZ_KAS_SIZE);
|
||||
memset(keysig, '?', NWZ_KEYSIG_SIZE);
|
||||
keysig[32] = keysig[41] = keysig[50] = 0;
|
||||
|
||||
if(g_kas)
|
||||
{
|
||||
if(strlen(g_kas) != NWZ_KAS_SIZE)
|
||||
{
|
||||
cprintf(GREY, "The specified KAS has wrong length (must be %d hex digits)\n", NWZ_KAS_SIZE);
|
||||
return 4;
|
||||
}
|
||||
memcpy(keysig, g_kas, NWZ_KAS_SIZE);
|
||||
decrypt_keysig(keysig);
|
||||
g_kas = keysig;
|
||||
g_key = keysig + 33;
|
||||
g_sig = keysig + 42;
|
||||
}
|
||||
else if(g_key)
|
||||
{
|
||||
if(strlen(g_key) != 8)
|
||||
{
|
||||
cprintf(GREY, "The specified key has wrong length (must be 8 hex digits)\n");
|
||||
return 4;
|
||||
}
|
||||
if(strlen(g_sig) != 8)
|
||||
{
|
||||
cprintf(GREY, "The specified sig has wrong length (must be 8 hex digits)\n");
|
||||
return 5;
|
||||
}
|
||||
|
||||
memcpy(keysig + 33, g_key, 8);
|
||||
if(!g_sig)
|
||||
cprintf(GREY, "Warning: you have specified a key but no sig, I won't be able to do any checks\n");
|
||||
else
|
||||
memcpy(keysig + 42, g_sig, 8);
|
||||
g_key = keysig + 33;
|
||||
g_sig = keysig + 42;
|
||||
}
|
||||
else if(g_model_index != -1)
|
||||
{
|
||||
if(g_model_list[g_model_index].flags & HAS_KAS)
|
||||
g_kas = g_model_list[g_model_index].kas;
|
||||
if(g_model_list[g_model_index].flags & HAS_KEY)
|
||||
g_key = g_model_list[g_model_index].key;
|
||||
if(g_model_list[g_model_index].flags & HAS_SIG)
|
||||
g_sig = g_model_list[g_model_index].sig;
|
||||
|
||||
if(g_key && g_sig)
|
||||
{
|
||||
memcpy(keysig + 33, g_key, 8);
|
||||
g_key = keysig + 33;
|
||||
memcpy(keysig + 42, g_sig, 8);
|
||||
g_sig = keysig + 42;
|
||||
}
|
||||
else if(g_kas)
|
||||
{
|
||||
memcpy(keysig, g_kas, NWZ_KAS_SIZE);
|
||||
decrypt_keysig(keysig);
|
||||
g_kas = keysig;
|
||||
g_key = keysig + 33;
|
||||
g_sig = keysig + 42;
|
||||
}
|
||||
else
|
||||
{
|
||||
printf("Target doesn't have enough information to get key and sig\n");
|
||||
return 1;
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
printf("Kill me\n");
|
||||
return 1;
|
||||
}
|
||||
|
||||
if(!g_kas)
|
||||
{
|
||||
g_kas = keysig;
|
||||
fwp_setkey("ed295076");
|
||||
memcpy(kas, g_key, 8);
|
||||
fwp_crypt(kas, 8, 0);
|
||||
for(int i = 0; i < 8; i++)
|
||||
{
|
||||
g_kas[2 * i] = hex_digit((kas[i] >> 4) & 0xf);
|
||||
g_kas[2 * i + 1] = hex_digit(kas[i] & 0xf);
|
||||
}
|
||||
memcpy(kas + 8, g_sig, 8);
|
||||
fwp_crypt(kas + 8, 8, 0);
|
||||
for(int i = 8; i < 16; i++)
|
||||
{
|
||||
g_kas[2 * i] = hex_digit((kas[i] >> 4) & 0xf);
|
||||
g_kas[2 * i + 1] = hex_digit(kas[i] & 0xf);
|
||||
}
|
||||
}
|
||||
|
||||
cprintf(BLUE, "Keys\n");
|
||||
cprintf_field(" KAS: ", "%."STR(NWZ_KAS_SIZE)"s\n", g_kas);
|
||||
cprintf_field(" Key: ", "%s\n", g_key);
|
||||
if(g_sig)
|
||||
cprintf_field(" Sig: ", "%s\n", g_sig);
|
||||
int ret = get_key_and_sig(false, NULL);
|
||||
if(ret != 0)
|
||||
return ret;
|
||||
|
||||
FILE *fout = fopen(argv[0], "wb");
|
||||
if(fout == NULL)
|
||||
|
|
@ -558,8 +509,8 @@ static int create_upg(int argc, char **argv)
|
|||
memcpy(hdr.sig, g_sig, 8);
|
||||
hdr.nr_files = nr_files;
|
||||
hdr.pad = 0;
|
||||
|
||||
int ret = fwp_write(&hdr, sizeof(hdr), &hdr, (void *)g_key);
|
||||
|
||||
ret = fwp_write(&hdr, sizeof(hdr), &hdr, (void *)g_key);
|
||||
if(ret)
|
||||
return ret;
|
||||
MD5_Update(&c, &hdr, sizeof(hdr));
|
||||
|
|
@ -573,7 +524,7 @@ static int create_upg(int argc, char **argv)
|
|||
entry.offset = offset;
|
||||
entry.size = filesize(files[i]);
|
||||
offset += ROUND_UP(entry.size, 8); // do it before encryption !!
|
||||
|
||||
|
||||
ret = fwp_write(&entry, sizeof(entry), &entry, (void *)g_key);
|
||||
if(ret)
|
||||
return ret;
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue