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hca: alt key bruteforcer for txt files

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This commit is contained in:
bnnm 2021-08-07 12:37:41 +02:00
parent 2b7455b87c
commit 15bd54dfa8
1 changed files with 96 additions and 7 deletions
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103
src/meta/hca.c
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@ -5,7 +5,7 @@
//#define HCA_BRUTEFORCE
#ifdef HCA_BRUTEFORCE
static void bruteforce_hca_key(STREAMFILE* sf, hca_codec_data* hca_data, unsigned long long* out_keycode, uint16_t subkey);
static void bruteforce_hca_key(STREAMFILE* sf, hca_codec_data* hca_data, unsigned long long* p_keycode, uint16_t subkey);
#endif
static void find_hca_key(hca_codec_data* hca_data, uint64_t* p_keycode, uint16_t subkey);
@ -191,7 +191,7 @@ done:
/* Bruteforce binary keys in executables and similar files, mainly for some mobile games.
* Kinda slow but acceptable for ~20MB exes, not very optimized. Unity usually has keys
* in plaintext (inside levelX or other base files) instead though. */
static void bruteforce_hca_key(STREAMFILE* sf, hca_codec_data* hca_data, unsigned long long* out_keycode, uint16_t subkey) {
static void bruteforce_hca_key_bin(STREAMFILE* sf, hca_codec_data* hca_data, unsigned long long* p_keycode, uint16_t subkey) {
STREAMFILE* sf_keys = NULL;
uint8_t* buf = NULL;
int best_score = 0xFFFFFF, cur_score;
@ -200,9 +200,9 @@ static void bruteforce_hca_key(STREAMFILE* sf, hca_codec_data* hca_data, unsigne
uint64_t old_key = 0;
VGM_LOG("HCA: test keys\n");
VGM_LOG("HCA: test keys.bin\n");
*out_keycode = 0;
*p_keycode = 0;
/* load whole file in memory for performance (exes with keys shouldn't be too big) */
sf_keys = open_streamfile_by_filename(sf, "keys.bin");
@ -232,14 +232,15 @@ static void bruteforce_hca_key(STREAMFILE* sf, hca_codec_data* hca_data, unsigne
//key = ((uint64_t)get_u32be(buf + pos + 0x00) << 0 ) | 0; /* upper bytes not set, ex. P5 */
/* observed files have aligned keys, change if needed */
pos += 0x04; //pos++;
pos += 0x04;
//pos++;
if (key == 0 || key == old_key)
continue;
old_key = key;
cur_score = 0;
test_key(hca_data, key, subkey, &cur_score, out_keycode);
test_key(hca_data, key, subkey, &cur_score, p_keycode);
if (cur_score == 1)
goto done;
@ -253,10 +254,98 @@ static void bruteforce_hca_key(STREAMFILE* sf, hca_codec_data* hca_data, unsigne
done:
VGM_ASSERT(best_score > 0, "HCA: best key=%08x%08x (score=%i)\n",
(uint32_t)((*out_keycode >> 32) & 0xFFFFFFFF), (uint32_t)(*out_keycode & 0xFFFFFFFF), best_score);
(uint32_t)((*p_keycode >> 32) & 0xFFFFFFFF), (uint32_t)(*p_keycode & 0xFFFFFFFF), best_score);
VGM_ASSERT(best_score < 0, "HCA: key not found\n");
if (best_score < 0 || best_score > 10000)
*p_keycode = 0;
close_streamfile(sf_keys);
free(buf);
}
#include <inttypes.h>
//#include <stdio.h>
/* same as the above but for txt lines. */
static void bruteforce_hca_key_txt(STREAMFILE* sf, hca_codec_data* hca_data, unsigned long long* p_keycode, uint16_t subkey) {
STREAMFILE* sf_keys = NULL;
uint8_t* buf = NULL;
int best_score = 0xFFFFFF, cur_score;
off_t keys_size, bytes;
int i = 0, pos;
char line[1024];
VGM_LOG("HCA: test keys.txt\n");
*p_keycode = 0;
/* load whole file in memory for performance (exes with keys shouldn't be too big) */
sf_keys = open_streamfile_by_filename(sf, "keys.txt");
if (!sf_keys) goto done;
keys_size = get_streamfile_size(sf_keys);
buf = malloc(keys_size);
if (!buf) goto done;
bytes = read_streamfile(buf, 0, keys_size, sf_keys);
if (bytes != keys_size) goto done;
VGM_LOG("HCA: start\n");
pos = 0;
while (pos < keys_size) {
int bytes_read, line_ok, count;
uint64_t key = 0;
bytes_read = read_line(line, sizeof(line), pos, sf_keys, &line_ok);
if (!line_ok) continue; //???
pos += bytes_read;
count = sscanf(line, "%" SCNd64, &key);
if (count != 1) continue;
VGM_ASSERT(pos % 100000 == 0, "HCA: count %i...\n", i);
if (key == 0)
continue;
i++;
cur_score = 0;
test_key(hca_data, key, subkey, &cur_score, p_keycode);
if (cur_score == 1)
goto done;
if (cur_score > 0 && cur_score <= 500) {
VGM_LOG("HCA: possible key=%08x%08x (score=%i) at %x\n",
(uint32_t)((key >> 32) & 0xFFFFFFFF), (uint32_t)(key & 0xFFFFFFFF), cur_score, pos-0x04);
if (best_score > cur_score)
best_score = cur_score;
}
}
done:
VGM_LOG("HCA: done %i keys.txt\n", i);
VGM_ASSERT(best_score > 0, "HCA: best key=%08x%08x (score=%i)\n",
(uint32_t)((*p_keycode >> 32) & 0xFFFFFFFF), (uint32_t)(*p_keycode & 0xFFFFFFFF), best_score);
VGM_ASSERT(best_score < 0, "HCA: key not found\n");
if (best_score < 0 || best_score > 10000)
*p_keycode = 0;
close_streamfile(sf_keys);
free(buf);
}
static void bruteforce_hca_key(STREAMFILE* sf, hca_codec_data* hca_data, unsigned long long* p_keycode, uint16_t subkey) {
bruteforce_hca_key_bin(sf, hca_data, p_keycode, subkey);
if (*p_keycode != 0)
return;
bruteforce_hca_key_txt(sf, hca_data, p_keycode, subkey);
if (*p_keycode != 0)
return;
}
#endif