mirror of
https://github.com/dashr9230/SA-MP.git
synced 2024-11-23 14:29:52 +00:00
455 lines
11 KiB
C++
455 lines
11 KiB
C++
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#include "ArchiveBuilder.h"
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#include "../saco/archive/CryptoContext.h"
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#include "../saco/archive/KeyPair.h"
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#include "../saco/archive/Signer.h"
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#include "../saco/archive/Hasher.h"
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#include "../saco/archive/TinyEncrypt.h"
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#include "../saco/archive/Obfuscator.h"
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#include <time.h>
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#define DO_ENCRYPT
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//------------------------------------
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DWORD CArchiveBuilder::ms_dwHashInit = OBFUSCATE_DATA(0x9E3779B9);
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//------------------------------------
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CArchiveBuilder::CArchiveBuilder(void)
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{
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m_dwNumEntries = SAA_MAX_ENTRIES;
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m_dwFDSize = SAA_MAX_FAKEDATA;
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m_bProperHeader = TRUE;
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}
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//------------------------------------
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CArchiveBuilder::CArchiveBuilder(DWORD dwNumEntries, DWORD dwFDSize, BOOL bProperHeader)
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{
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m_dwNumEntries = dwNumEntries;
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m_dwFDSize = dwFDSize;
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m_bProperHeader = bProperHeader;
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}
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//------------------------------------
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CArchiveBuilder::~CArchiveBuilder(void)
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{
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if (!m_vecEntries.empty()) {
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EntryMemStateVector_t::iterator it = m_vecEntries.begin();
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while(it != m_vecEntries.end()) {
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AB_ENTRY_MEMSTATE* pEntry = (*it);
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fclose(pEntry->fiFile);
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delete pEntry;
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it++;
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}
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}
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}
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//------------------------------------
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DWORD CArchiveBuilder::HashString(PCHAR szString)
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{
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// This is an implementation of the Jenkins hash
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# define mix(a,b,c) \
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{ \
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a -= b; a -= c; a ^= (c>>13); \
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b -= c; b -= a; b ^= (a<<8); \
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c -= a; c -= b; c ^= (b>>13); \
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a -= b; a -= c; a ^= (c>>12); \
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b -= c; b -= a; b ^= (a<<16); \
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c -= a; c -= b; c ^= (b>>5); \
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a -= b; a -= c; a ^= (c>>3); \
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b -= c; b -= a; b ^= (a<<10); \
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c -= a; c -= b; c ^= (b>>15); \
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}
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register BYTE* k = (BYTE*)szString;
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register DWORD initval = 0x12345678;
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register DWORD length;
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length = (DWORD)strlen(szString);
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register DWORD a,b,c,len;
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/* Set up the internal state */
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len = length;
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a = b = UNOBFUSCATE_DATA(ms_dwHashInit); /* the golden ratio; an arbitrary value */
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c = initval; /* the previous hash value */
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/*---------------------------------------- handle most of the key */
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while (len >= 12)
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{
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a += (k[0] +((DWORD)k[1]<<8) +((DWORD)k[2]<<16) +((DWORD)k[3]<<24));
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b += (k[4] +((DWORD)k[5]<<8) +((DWORD)k[6]<<16) +((DWORD)k[7]<<24));
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c += (k[8] +((DWORD)k[9]<<8) +((DWORD)k[10]<<16)+((DWORD)k[11]<<24));
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mix(a,b,c);
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k += 12; len -= 12;
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}
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/*------------------------------------- handle the last 11 bytes */
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c += length;
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switch(len) /* all the case statements fall through */
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{
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case 11: c+=((DWORD)k[10]<<24);
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case 10: c+=((DWORD)k[9]<<16);
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case 9 : c+=((DWORD)k[8]<<8);
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/* the first byte of c is reserved for the length */
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case 8 : b+=((DWORD)k[7]<<24);
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case 7 : b+=((DWORD)k[6]<<16);
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case 6 : b+=((DWORD)k[5]<<8);
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case 5 : b+=k[4];
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case 4 : a+=((DWORD)k[3]<<24);
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case 3 : a+=((DWORD)k[2]<<16);
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case 2 : a+=((DWORD)k[1]<<8);
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case 1 : a+=k[0];
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/* case 0: nothing left to add */
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}
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mix(a,b,c);
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/*-------------------------------------------- report the result */
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return c;
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}
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//------------------------------------
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PCHAR CArchiveBuilder::ExtractFileName(PCHAR szString)
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{
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DWORD dwOffset = (DWORD)strlen(szString);
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while((dwOffset > 0) && (szString[dwOffset] != '\\'))
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dwOffset--;
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if (dwOffset == 0)
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return szString;
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else
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return szString+dwOffset+1;
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}
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//------------------------------------
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DWORD CArchiveBuilder::AddFile(PCHAR szFileName)
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{
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AB_ENTRY_MEMSTATE* pEntry = new AB_ENTRY_MEMSTATE();
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PCHAR szNameOnly = ExtractFileName(szFileName);
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if ((strlen(szNameOnly)+1) > sizeof(pEntry->szFileName))
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throw "Internal Error: Not enough memory allocated for the length of the filename.";
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strcpy(pEntry->szFileName, szNameOnly);
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_strlwr(pEntry->szFileName);
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pEntry->dwFileNameHash = HashString(pEntry->szFileName);
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FILE* fiFile;
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fiFile = fopen(szFileName, "rb");
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if (!fiFile)
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throw "Could not load archive data file.";
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pEntry->fiFile = fiFile;
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fseek(fiFile, 0, SEEK_END);
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pEntry->dwFileSize = (DWORD)ftell(fiFile);
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fseek(fiFile, 0, SEEK_SET);
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if (pEntry->dwFileSize > 16*1024*1024)
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throw "Archive data file is greater than 16MB.";
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m_vecEntries.push_back(pEntry);
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return pEntry->dwFileNameHash;
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}
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//------------------------------------
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void CArchiveBuilder::BuildEntryTable(SAA_ENTRY *pEntryTable, DWORD dwInvalidIndex)
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{
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CCryptoContext context;
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BOOL* pbEntryUsed;
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EntryMemStateVector_t::iterator it;
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DWORD dwIndex;
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AB_ENTRY_MEMSTATE* pEntry;
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// Create some stuff to make things simple
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pbEntryUsed = new BOOL[m_dwNumEntries];
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memset(pbEntryUsed, 0, sizeof(BOOL)*m_dwNumEntries);
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// Make the entire table's data random
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context.GenerateRandom(m_dwNumEntries*sizeof(SAA_ENTRY), reinterpret_cast<BYTE*>(pEntryTable));
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// Ensure that there are no hash collisions between whats in the entry table and our files
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BOOL bCollision = FALSE;
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for(DWORD i=0; i<m_dwNumEntries; i++) {
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it = m_vecEntries.begin();
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while(it != m_vecEntries.end()) {
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pEntry = (*it);
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if (pEntryTable[i].dwFileNameHash == pEntry->dwFileNameHash) {
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pEntryTable[i].dwFileNameHash = GetRandom();
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bCollision = TRUE;
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break;
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}
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it++;
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}
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if (bCollision) {
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bCollision = FALSE;
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i--;
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}
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}
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/*
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// Ver1: Set all the invalid entries to the invalid index
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for(DWORD i=0; i<m_dwNumEntries; i++) {
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pEntryTable[i].dwPrevEntry = dwInvalidIndex;
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}
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*/
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// Ver2: Set all the invalid entries to itself, use the invalid index for the first entry instead
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for(DWORD i=0; i<m_dwNumEntries; i++) {
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pEntryTable[i].dwPrevEntry = i;
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}
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// Randomly place our loaded entries into the entry table
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it = m_vecEntries.begin();
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while(it != m_vecEntries.end()) {
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pEntry = (*it);
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// Generate a random value that works for us
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while(1) {
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dwIndex = (GetRandom() >> 5) & 0xFF; // Take it from the middle!
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dwIndex %= m_dwNumEntries;
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// Check if it matches our reserved index for invalid files
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if (dwIndex == dwInvalidIndex)
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continue;
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// Check to see if any existing entries have this index
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if (pbEntryUsed[dwIndex])
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continue;
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break;
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}
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pbEntryUsed[dwIndex] = true;
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pEntry->pEntry = &(pEntryTable[dwIndex]);
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pEntry->dwEntryTableOffset = dwIndex;
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pEntry->pbTEAKey = reinterpret_cast<BYTE*>(pEntryTable) +
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(pEntry->dwFileNameHash % (sizeof(SAA_ENTRY)*m_dwNumEntries-TEA_KEY_SIZE));
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pEntry->pEntry->dwFileNameHash = pEntry->dwFileNameHash;
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pEntry->pEntry->dwFileSize = pEntry->dwFileSize;
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if (it == m_vecEntries.begin()) {
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// Ver2: Set the first index to the invalid index
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pEntry->pEntry->dwPrevEntry = dwInvalidIndex;
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} else {
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pEntry->pEntry->dwPrevEntry = (*(it-1))->dwEntryTableOffset;
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}
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it++;
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}
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/*
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// Ver1:
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// Process the first entry finally and set its previous index to
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// an invalid entry, but not to our invalid index
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it = m_vecEntries.begin();
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while(1) {
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dwIndex = (GetRandom() >> 5) & 0xFF; // Take it from the middle!
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// Check if it matches our reserved index for invalid files
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if (dwIndex == dwInvalidIndex)
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continue;
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// Check to see if any existing entries have this index
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if (pbEntryUsed[dwIndex])
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continue;
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break;
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}
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(*it)->pEntry->dwPrevEntry = dwIndex;
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*/
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// Now obfuscate the non-hash part of all our entries
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// XOR it with the hash for good measure.
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for(DWORD i=0; i<m_dwNumEntries; i++) {
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pEntryTable[i].dwDataBlock ^= pEntryTable[i].dwFileNameHash;
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pEntryTable[i].dwDataBlock = OBFUSCATE_DATA(pEntryTable[i].dwDataBlock);
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}
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}
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//------------------------------------
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DWORD CArchiveBuilder::GetRandom()
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{
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static BOOL bSeeded = FALSE;
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if (!bSeeded) {
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srand((DWORD)time(NULL));
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bSeeded = true;
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}
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DWORD dwRandom;
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dwRandom = rand();
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dwRandom <<= 15;
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dwRandom ^= rand();
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dwRandom <<= 15;
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dwRandom ^= rand();
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return dwRandom;
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}
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//------------------------------------
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void CArchiveBuilder::BuildHeader(SAA_FILE_HEADER* pFileHeader)
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{
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CCryptoContext context;
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context.GenerateRandom(pFileHeader->SizeOf(), reinterpret_cast<BYTE*>(pFileHeader));
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pFileHeader->dwFakeDataSize = this->m_dwFDSize;
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if (this->m_bProperHeader)
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pFileHeader->InitializeDataV1();
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pFileHeader->InitializeDataV2();
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pFileHeader->headerV2.dwInvalidIndex %= m_dwNumEntries;
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}
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//------------------------------------
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void CArchiveBuilder::BuildEntryData(FILE *fiArchive)
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{
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CCryptoContext context;
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EntryMemStateVector_t::iterator it;
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const DWORD dwReadBlockSize = SAA_BLOCK_SIZE;
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CTinyEncrypt tinyEncrypt;
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BYTE *pbReadData = new BYTE[dwReadBlockSize];
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it = m_vecEntries.begin();
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while(it != m_vecEntries.end()) {
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AB_ENTRY_MEMSTATE* pEntry = (*it);
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tinyEncrypt.SetKey(pEntry->pbTEAKey, 0);
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DWORD dwReadSize;
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for(DWORD i=0; i<pEntry->dwFileSize; i+=dwReadBlockSize) {
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dwReadSize = (DWORD)fread(pbReadData, 1, dwReadBlockSize, pEntry->fiFile);
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if (dwReadSize < dwReadBlockSize) {
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context.GenerateRandom(dwReadBlockSize-dwReadSize, pbReadData+dwReadSize);
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}
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#ifdef DO_ENCRYPT
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tinyEncrypt.EncryptData(dwReadBlockSize, pbReadData);
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#endif
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fwrite(pbReadData, 1, dwReadBlockSize, fiArchive);
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}
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it++;
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}
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delete[] pbReadData;
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}
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//------------------------------------
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void CArchiveBuilder::SignArchive(FILE *fiArchive, DWORD dwSignatureOffset, SAA_FILE_HEADER *pHeader)
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{
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// Sign the archive file
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CCryptoContext context;
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CKeyPair keyPair(&context);
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CHasher hasher(&context);
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CSigner signer;
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// 1. Hash the stuff
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fseek(fiArchive, pHeader->SizeOf(), SEEK_SET); // start from the actual data section
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const DWORD dwReadBlockSize = 10 * 1024; // 10kb
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BYTE *pbReadData = new BYTE[dwReadBlockSize];
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DWORD dwReadSize;
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DWORD dwPos = ftell(fiArchive);
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while(!feof(fiArchive)) {
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dwReadSize = (DWORD)fread(pbReadData, 1, dwReadBlockSize, fiArchive);
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hasher.AddData(dwReadSize, pbReadData);
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dwPos = ftell(fiArchive);
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}
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delete[] pbReadData;
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// 2. Load the key, and sign the hash
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keyPair.LoadFromFile("pkey.bin");
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signer.SignHash(&hasher);
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keyPair.ReleaseKey();
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// 3. Write the signature
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pHeader->headerV2.dwSignSize = signer.GetSignatureLength();
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fseek(fiArchive, dwSignatureOffset, SEEK_SET);
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fwrite(signer.GetSignature(), 1, pHeader->headerV2.dwSignSize, fiArchive);
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}
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//------------------------------------
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void CArchiveBuilder::WriteArchive(PCHAR szFileName)
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{
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SAA_FILE_HEADER header;
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SAA_ENTRY *pEntryTable;
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FILE* fiArchive;
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fiArchive = fopen(szFileName, "w+b");
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pEntryTable = new SAA_ENTRY[m_dwNumEntries];
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// 1. Build the header
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BuildHeader(&header);
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// 2. Build the entry table
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BuildEntryTable(pEntryTable, header.headerV2.dwInvalidIndex);
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// 3. Encode and write the file data
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fseek(fiArchive, header.SizeOf(), SEEK_SET);
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BuildEntryData(fiArchive);
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// 4. Encrypt and write the entry table
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// (Note that the file data decryption must be done with decrypted entry table used for keys)
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CTinyEncrypt tinyEnc;
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tinyEnc.LoadKey("skey.bin");
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#ifdef DO_ENCRYPT
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tinyEnc.EncryptData(sizeof(SAA_ENTRY)*m_dwNumEntries, reinterpret_cast<BYTE*>(pEntryTable));
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#endif
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fwrite(pEntryTable, sizeof(SAA_ENTRY), m_dwNumEntries, fiArchive);
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// 5. Sign the data (excluding the header)
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fflush(fiArchive);
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SignArchive(fiArchive, (DWORD)ftell(fiArchive), &header);
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// 6. Finish the header and write it
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#ifdef DO_ENCRYPT
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header.XorV2Identifier();
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#endif
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header.Write(fiArchive);
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// And we're done.
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fclose(fiArchive);
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delete[] pEntryTable;
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}
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//------------------------------------
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