mirror of
https://github.com/vgmstream/vgmstream.git
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253 lines
7.4 KiB
C
253 lines
7.4 KiB
C
#ifndef _HCA_BF_
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#define _HCA_BF_
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#include "meta.h"
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#include "../coding/coding.h"
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#ifdef HCA_BRUTEFORCE
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static void bruteforce_process_result(hca_keytest_t* hk, unsigned long long* p_keycode) {
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*p_keycode = hk->best_key;
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if (hk->best_score < 0 || hk->best_score > 10000) {
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VGM_LOG("HCA BF: no good key found\n");
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}
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else {
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VGM_LOG("HCA BF: best key=%08x%08x (score=%i)\n",
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(uint32_t)((*p_keycode >> 32) & 0xFFFFFFFF), (uint32_t)(*p_keycode & 0xFFFFFFFF), hk->best_score);
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}
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}
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typedef enum {
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HBF_TYPE_64LE_1,
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HBF_TYPE_64BE_1,
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HBF_TYPE_32LE_1,
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HBF_TYPE_32BE_1,
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HBF_TYPE_64LE_4,
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HBF_TYPE_64BE_4,
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HBF_TYPE_32LE_4,
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HBF_TYPE_32BE_4,
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} HBF_type_t;
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/* Bruteforce binary keys in executables and similar files, mainly for some mobile games.
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* Kinda slow but acceptable for ~100MB exes, not very optimized. Unity usually has keys
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* in plaintext (inside levelX or other base files) instead though, use test below. */
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static void bruteforce_hca_key_bin_type(STREAMFILE* sf, hca_codec_data* hca_data, unsigned long long* p_keycode, uint16_t subkey, HBF_type_t type) {
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STREAMFILE* sf_keys = NULL;
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uint8_t* buf = NULL;
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uint32_t keys_size, bytes;
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int pos, step;
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uint64_t key = 0, old_key = 0;
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hca_keytest_t hk = {0};
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hk.subkey = subkey;
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*p_keycode = 0;
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/* load whole file in memory for performance (exes with keys shouldn't be too big) */
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sf_keys = open_streamfile_by_filename(sf, "keys.bin");
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if (!sf_keys) return;
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VGM_LOG("HCA BF: test keys.bin (type %i)\n", type);
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keys_size = get_streamfile_size(sf_keys);
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buf = malloc(keys_size);
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if (!buf) {
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VGM_LOG("HCA BF: key file too big!\n");
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goto done;
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}
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bytes = read_streamfile(buf, 0, keys_size, sf_keys);
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if (bytes != keys_size) goto done;
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VGM_LOG("HCA BF: start .bin\n");
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switch(type) {
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case HBF_TYPE_64LE_1:
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case HBF_TYPE_64BE_1:
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case HBF_TYPE_32LE_1:
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case HBF_TYPE_32BE_1: step = 0x01; break;
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case HBF_TYPE_64LE_4:
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case HBF_TYPE_64BE_4:
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case HBF_TYPE_32LE_4:
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case HBF_TYPE_32BE_4: step = 0x04; break;
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default: goto done;
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}
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pos = 0;
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while (pos < keys_size - 8) {
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VGM_ASSERT(pos % 0x1000000 == 0, "HCA: pos %x...\n", pos);
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/* keys are usually u64le but other orders may exist */
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switch(type) {
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case HBF_TYPE_64LE_1: key = get_u64le(buf + pos); break;
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case HBF_TYPE_64BE_1: key = get_u64be(buf + pos); break;
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case HBF_TYPE_32LE_1: key = get_u32le(buf + pos); break;
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case HBF_TYPE_32BE_1: key = get_u32be(buf + pos); break;
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case HBF_TYPE_64LE_4: key = get_u64le(buf + pos); break;
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case HBF_TYPE_64BE_4: key = get_u64be(buf + pos); break;
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case HBF_TYPE_32LE_4: key = get_u32le(buf + pos); break;
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case HBF_TYPE_32BE_4: key = get_u32be(buf + pos); break;
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default: goto done;
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}
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pos += step;
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if (key == 0 || key == old_key)
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continue;
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old_key = key;
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hk.key = key;
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test_hca_key(hca_data, &hk);
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if (hk.best_score == 1)
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goto done;
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}
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done:
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bruteforce_process_result(&hk, p_keycode);
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close_streamfile(sf_keys);
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free(buf);
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}
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static void bruteforce_hca_key_bin(STREAMFILE* sf, hca_codec_data* hca_data, unsigned long long* p_keycode, uint16_t subkey) {
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bruteforce_hca_key_bin_type(sf, hca_data, p_keycode, subkey, HBF_TYPE_64LE_1);
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bruteforce_hca_key_bin_type(sf, hca_data, p_keycode, subkey, HBF_TYPE_32LE_1);
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//bruteforce_hca_key_bin_type(sf, hca_data, p_keycode, subkey, HBF_TYPE_64BE_1);
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//bruteforce_hca_key_bin_type(sf, hca_data, p_keycode, subkey, HBF_TYPE_32BE_1);
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//bruteforce_hca_key_bin_type(sf, hca_data, p_keycode, subkey, HBF_TYPE_64LE_4);
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//bruteforce_hca_key_bin_type(sf, hca_data, p_keycode, subkey, HBF_TYPE_32LE_4);
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//bruteforce_hca_key_bin_type(sf, hca_data, p_keycode, subkey, HBF_TYPE_64BE_4);
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//bruteforce_hca_key_bin_type(sf, hca_data, p_keycode, subkey, HBF_TYPE_32BE_4);
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}
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#include <inttypes.h>
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//#include <stdio.h>
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/* same as the above but for txt lines. */
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static void bruteforce_hca_key_txt(STREAMFILE* sf, hca_codec_data* hca_data, unsigned long long* p_keycode, uint16_t subkey) {
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STREAMFILE* sf_keys = NULL;
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uint8_t* buf = NULL;
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uint32_t keys_size, bytes;
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char line[1024];
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int i = 0, pos;
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uint64_t key = 0;
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hca_keytest_t hk = {0};
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hk.subkey = subkey;
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*p_keycode = 0;
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/* load whole file in memory for performance (exes with keys shouldn't be too big) */
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sf_keys = open_streamfile_by_filename(sf, "keys.txt");
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if (!sf_keys) return;
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VGM_LOG("HCA BF: test keys.txt\n");
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keys_size = get_streamfile_size(sf_keys);
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buf = malloc(keys_size);
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if (!buf) {
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VGM_LOG("HCA BF: key file too big!\n");
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goto done;
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}
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bytes = read_streamfile(buf, 0, keys_size, sf_keys);
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if (bytes != keys_size) goto done;
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VGM_LOG("HCA BF: start .txt\n");
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pos = 0;
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while (pos < keys_size) {
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int bytes_read, line_ok, count;
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key = 0;
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bytes_read = read_line(line, sizeof(line), pos, sf_keys, &line_ok);
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pos += bytes_read;
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if (!line_ok) continue; /* line too long */
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count = sscanf(line, "%" SCNd64, &key);
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if (count != 1) continue;
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VGM_ASSERT(pos % 10000 == 0, "HCA: count %i...\n", i);
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if (key == 0)
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continue;
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i++;
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hk.key = key;
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test_hca_key(hca_data, &hk);
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if (hk.best_score == 1)
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goto done;
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}
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done:
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bruteforce_process_result(&hk, p_keycode);
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close_streamfile(sf_keys);
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free(buf);
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}
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/* same as the above but good ol' bruteforce numbers (useful for games with keys that are dates) */
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static void bruteforce_hca_key_num(STREAMFILE* sf, hca_codec_data* hca_data, unsigned long long* p_keycode, uint16_t subkey) {
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STREAMFILE* sf_keys = NULL;
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uint32_t keys_size;
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uint64_t min, max;
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uint64_t key = 0;
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hca_keytest_t hk = {0};
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hk.subkey = subkey;
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*p_keycode = 0;
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/* load whole file in memory for performance (exes with keys shouldn't be too big) */
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sf_keys = open_streamfile_by_filename(sf, "keys.num");
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if (!sf_keys) return;
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VGM_LOG("HCA BF: test keys.num\n");
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keys_size = get_streamfile_size(sf_keys);
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/* don't set too high as it does ~70000 keys per second, do the math */
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if (keys_size < 0x10) {
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min = 0;
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max = 0xFFFFFFFF;
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}
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else {
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min = read_u64be(0x00, sf_keys);
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max = read_u64be(0x08, sf_keys);
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}
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VGM_LOG("HCA BF: start .num\n");
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while (min < max) {
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key = min;
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min++;
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VGM_ASSERT(min % 0x100000 == 0, "HCA: count %x...\n", (uint32_t)min);
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hk.key = key;
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test_hca_key(hca_data, &hk);
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if (hk.best_score == 1)
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goto done;
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}
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done:
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bruteforce_process_result(&hk, p_keycode);
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close_streamfile(sf_keys);
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}
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static void bruteforce_hca_key(STREAMFILE* sf, hca_codec_data* hca_data, unsigned long long* p_keycode, uint16_t subkey) {
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bruteforce_hca_key_bin(sf, hca_data, p_keycode, subkey);
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if (*p_keycode != 0)
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return;
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bruteforce_hca_key_txt(sf, hca_data, p_keycode, subkey);
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if (*p_keycode != 0)
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return;
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bruteforce_hca_key_num(sf, hca_data, p_keycode, subkey);
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if (*p_keycode != 0)
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return;
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}
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#endif
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#endif /*_HCA_BF_*/
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