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Improve speed of finding FS keys

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This commit is contained in:
shchmue
2019-01-04 13:40:30 -05:00
parent 49c6fd8dc7
commit 352c39ae8a
6 changed files with 81 additions and 49 deletions
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46
source/KeyLocation.cpp
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@ -16,9 +16,15 @@
#include "KeyLocation.hpp"
#include "Common.hpp"
#include "xxhash64.h"
#include <algorithm>
#include <unordered_map>
#include <switch.h>
void KeyLocation::get_from_memory(u64 tid, u8 segMask) {
void KeyLocation::get_from_memory(u64 tid, u8 seg_mask) {
Handle debug_handle = INVALID_HANDLE;
u64 d[8];
@ -62,10 +68,10 @@ void KeyLocation::get_from_memory(u64 tid, u8 segMask) {
{
svcQueryDebugProcessMemory(&mem_info, &page_info, debug_handle, addr);
// weird code to allow for bitmasking segments
if ((mem_info.perm & Perm_R) &&
if ((mem_info.perm & Perm_R) &&
((mem_info.type & 0xff) >= MemType_CodeStatic) &&
((mem_info.type & 0xff) < MemType_Heap) &&
((segment <<= 1) >> 1 & segMask) > 0)
((segment <<= 1) >> 1 & seg_mask) > 0)
{
data.resize(data.size() + mem_info.size);
if(R_FAILED(svcReadDebugProcessMemory(data.data() + data.size() - mem_info.size, debug_handle, mem_info.addr, mem_info.size))) {
@ -86,4 +92,38 @@ void KeyLocation::get_keyblobs() {
data.resize(0x200 * KNOWN_KEYBLOBS);
fsStorageRead(&boot0, KEYBLOB_OFFSET, data.data(), data.size());
fsStorageClose(&boot0);
}
void KeyLocation::find_keys(std::vector<Key *> &keys) {
if (data.size() == 0)
return;
u8 temp_hash[0x20];
size_t key_indices_left = keys.size();
u64 hash = 0;
std::unordered_map<u64, size_t> hash_index;
for (size_t i = 0; i < keys.size(); i++)
hash_index[keys[i]->xx_hash] = i;
// hash every length-sized byte chunk in data until it matches a key hash
for (size_t i = 0; i < data.size() - 0x10; i++) {
hash = XXHash64::hash(data.data() + i, 0x10, 0);
auto search = hash_index.find(hash);
if (search == hash_index.end()) {
continue;
}
size_t key_index = hash_index[hash];
u8 key_length = keys[key_index]->length;
// double-check sha256 since xxhash64 isn't as collision-safe
Common::sha256(data.data() + i, temp_hash, key_length);
if (!std::equal(keys[key_index]->hash.begin(), keys[key_index]->hash.end(), temp_hash))
continue;
std::copy(data.begin() + i, data.begin() + i + key_length, std::back_inserter(keys[key_index]->key));
keys[key_index]->is_found = true;
key_indices_left--;
if (key_indices_left == 0)
return;
hash_index.erase(hash);
i += key_length - 1;
}
}