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hca bruteforcer: tweaks

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bnnm 2024-02-25 23:11:07 +01:00
parent 5504c3053a
commit 7cb7783e84
1 changed files with 33 additions and 8 deletions
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41
src/meta/hca_bf.h
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@ -5,6 +5,7 @@
#include "../coding/coding.h"
#ifdef HCA_BRUTEFORCE
#define HCA_BF_CHUNK 0x48000008 //~1GB (int), extra size for keys in between chunks
static void bruteforce_process_result(hca_keytest_t* hk, unsigned long long* p_keycode) {
*p_keycode = hk->best_key;
@ -34,7 +35,8 @@ typedef enum {
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) {
STREAMFILE* sf_keys = NULL;
uint8_t* buf = NULL;
uint32_t keys_size, bytes;
uint64_t keys_offset;
uint32_t keys_limit;
int pos, step;
uint64_t key = 0, old_key = 0;
hca_keytest_t hk = {0};
@ -48,16 +50,12 @@ static void bruteforce_hca_key_bin_type(STREAMFILE* sf, hca_codec_data* hca_data
VGM_LOG("HCA BF: test keys.bin (type %i)\n", type);
keys_size = get_streamfile_size(sf_keys);
buf = malloc(keys_size);
buf = malloc(HCA_BF_CHUNK);
if (!buf) {
VGM_LOG("HCA BF: key file too big!\n");
goto done;
}
bytes = read_streamfile(buf, 0, keys_size, sf_keys);
if (bytes != keys_size) goto done;
VGM_LOG("HCA BF: start .bin\n");
@ -73,9 +71,36 @@ static void bruteforce_hca_key_bin_type(STREAMFILE* sf, hca_codec_data* hca_data
default: goto done;
}
/* main read */
keys_offset = 0;
keys_limit = 0;
pos = 0;
while (pos < keys_size - 8) {
VGM_ASSERT(pos % 0x1000000 == 0, "HCA: pos %x...\n", pos);
while (true) {
/* read new chunk */
if (pos >= keys_limit) {
if (keys_offset + keys_limit == get_streamfile_size(sf_keys))
break;
if (keys_limit >= 8)
keys_offset += keys_limit - 8;
VGM_LOG("HCA: reading %llx + ...\n", (long long)keys_offset);
keys_limit = read_streamfile(buf, keys_offset, HCA_BF_CHUNK, sf_keys);
if (keys_limit == 0)
return;
pos = 0;
}
if (pos % 0x1000000 == 0) {
uint64_t pos_out = keys_offset + pos;
VGM_LOG("HCA: pos %llx...\n", (long long)pos_out);
}
#ifdef HCA_BF_IGNORE_BAD_KEYS
if (!is_good_key(buf + pos, int_size)) {
pos += step;
continue;
}
#endif
/* keys are usually u64le but other orders may exist */
switch(type) {