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  1. /*
  2.     This file is part of "Filter Foundry", a filter plugin for Adobe Photoshop
  3.     Copyright (C) 2003-2009 Toby Thain, toby@telegraphics.com.au
  4.     Copyright (C) 2018-2022 Daniel Marschall, ViaThinkSoft
  5.  
  6.     This program is free software; you can redistribute it and/or modify
  7.     it under the terms of the GNU General Public License as published by
  8.     the Free Software Foundation; either version 2 of the License, or
  9.     (at your option) any later version.
  10.  
  11.     This program is distributed in the hope that it will be useful,
  12.     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13.     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14.     GNU General Public License for more details.
  15.  
  16.     You should have received a copy of the GNU General Public License
  17.     along with this program; if not, write to the Free Software
  18.     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19. */
  20.  
  21. #include <stddef.h>
  22. #include <stdint.h>
  23.  
  24. #include "ff.h"
  25.  
  26. // this value will be manipulated during the building of each individual filter (see make_win.c)
  27. // It should be aligned to 4
  28. const volatile uint64_t cObfuscSeed = 0x38AD972A52830517ull;
  29.  
  30. int rand_msvcc(unsigned int* seed) {
  31.         *seed = *seed * 214013L + 2531011L;
  32.         return (*seed >> 16) & 0x7fff; /* Scale between 0 and RAND_MAX */
  33. }
  34.  
  35. int rand_openwatcom(unsigned int* seed) {
  36.         // https://github.com/open-watcom/open-watcom-v2/blob/master/bld/clib/math/c/rand.c
  37.         *seed = *seed * 1103515245L + 12345L;
  38.         return (*seed >> 16) & 0x7fff; /* Scale between 0 and RAND_MAX */
  39. }
  40.  
  41. void xorshift(unsigned char** p, uint32_t* x32, size_t num) {
  42.         size_t i;
  43.         unsigned char* x = *p;
  44.         for (i = 0; i < num; i++) {
  45.                 // https://de.wikipedia.org/wiki/Xorshift
  46.                 *x32 ^= *x32 << 13;
  47.                 *x32 ^= *x32 >> 17;
  48.                 *x32 ^= *x32 << 5;
  49.                 *x++ ^= *x32;
  50.         }
  51.         *p = x;
  52. }
  53.  
  54. #ifndef CHAR_BIT
  55. #define CHAR_BIT 8
  56. #endif
  57.  
  58. uint64_t rol_u64(uint64_t value, uint64_t by) {
  59.         return value << by | value >> (sizeof(uint64_t) * CHAR_BIT - by);
  60. }
  61.  
  62. void rolshift(unsigned char** p, uint64_t* x64, size_t num) {
  63.         size_t i;
  64.         unsigned char* x = *p;
  65.         for (i = 0; i < num; i++) {
  66.                 *x++ ^= *x64;
  67.                 *x64 = rol_u64(*x64, 1);
  68.         }
  69.         *p = x;
  70. }
  71.  
  72. uint32_t crc32b(char *data, int nLength) {
  73.         int i, j, k;
  74.         uint32_t crc, mask;
  75.         char byte;
  76.  
  77.         i = 0;
  78.         crc = 0xFFFFFFFF;
  79.  
  80.         for(k=0;k<nLength;k++) {
  81.                 byte = data[k];
  82.                 crc = crc ^ byte;
  83.                 for (j = 7; j >= 0; j--) {
  84.                         mask = (-1) * (crc & 1);
  85.                         crc = (crc >> 1) ^ (0xEDB88320 & mask);
  86.                 }
  87.                 i++;
  88.         }
  89.         return ~crc;
  90. }
  91.  
  92. static const uint64_t crc64_tab[256] = {
  93.         0x0000000000000000ULL, 0x42F0E1EBA9EA3693ULL, 0x85E1C3D753D46D26ULL,
  94.         0xC711223CFA3E5BB5ULL, 0x493366450E42ECDFULL, 0x0BC387AEA7A8DA4CULL,
  95.         0xCCD2A5925D9681F9ULL, 0x8E224479F47CB76AULL, 0x9266CC8A1C85D9BEULL,
  96.         0xD0962D61B56FEF2DULL, 0x17870F5D4F51B498ULL, 0x5577EEB6E6BB820BULL,
  97.         0xDB55AACF12C73561ULL, 0x99A54B24BB2D03F2ULL, 0x5EB4691841135847ULL,
  98.         0x1C4488F3E8F96ED4ULL, 0x663D78FF90E185EFULL, 0x24CD9914390BB37CULL,
  99.         0xE3DCBB28C335E8C9ULL, 0xA12C5AC36ADFDE5AULL, 0x2F0E1EBA9EA36930ULL,
  100.         0x6DFEFF5137495FA3ULL, 0xAAEFDD6DCD770416ULL, 0xE81F3C86649D3285ULL,
  101.         0xF45BB4758C645C51ULL, 0xB6AB559E258E6AC2ULL, 0x71BA77A2DFB03177ULL,
  102.         0x334A9649765A07E4ULL, 0xBD68D2308226B08EULL, 0xFF9833DB2BCC861DULL,
  103.         0x388911E7D1F2DDA8ULL, 0x7A79F00C7818EB3BULL, 0xCC7AF1FF21C30BDEULL,
  104.         0x8E8A101488293D4DULL, 0x499B3228721766F8ULL, 0x0B6BD3C3DBFD506BULL,
  105.         0x854997BA2F81E701ULL, 0xC7B97651866BD192ULL, 0x00A8546D7C558A27ULL,
  106.         0x4258B586D5BFBCB4ULL, 0x5E1C3D753D46D260ULL, 0x1CECDC9E94ACE4F3ULL,
  107.         0xDBFDFEA26E92BF46ULL, 0x990D1F49C77889D5ULL, 0x172F5B3033043EBFULL,
  108.         0x55DFBADB9AEE082CULL, 0x92CE98E760D05399ULL, 0xD03E790CC93A650AULL,
  109.         0xAA478900B1228E31ULL, 0xE8B768EB18C8B8A2ULL, 0x2FA64AD7E2F6E317ULL,
  110.         0x6D56AB3C4B1CD584ULL, 0xE374EF45BF6062EEULL, 0xA1840EAE168A547DULL,
  111.         0x66952C92ECB40FC8ULL, 0x2465CD79455E395BULL, 0x3821458AADA7578FULL,
  112.         0x7AD1A461044D611CULL, 0xBDC0865DFE733AA9ULL, 0xFF3067B657990C3AULL,
  113.         0x711223CFA3E5BB50ULL, 0x33E2C2240A0F8DC3ULL, 0xF4F3E018F031D676ULL,
  114.         0xB60301F359DBE0E5ULL, 0xDA050215EA6C212FULL, 0x98F5E3FE438617BCULL,
  115.         0x5FE4C1C2B9B84C09ULL, 0x1D14202910527A9AULL, 0x93366450E42ECDF0ULL,
  116.         0xD1C685BB4DC4FB63ULL, 0x16D7A787B7FAA0D6ULL, 0x5427466C1E109645ULL,
  117.         0x4863CE9FF6E9F891ULL, 0x0A932F745F03CE02ULL, 0xCD820D48A53D95B7ULL,
  118.         0x8F72ECA30CD7A324ULL, 0x0150A8DAF8AB144EULL, 0x43A04931514122DDULL,
  119.         0x84B16B0DAB7F7968ULL, 0xC6418AE602954FFBULL, 0xBC387AEA7A8DA4C0ULL,
  120.         0xFEC89B01D3679253ULL, 0x39D9B93D2959C9E6ULL, 0x7B2958D680B3FF75ULL,
  121.         0xF50B1CAF74CF481FULL, 0xB7FBFD44DD257E8CULL, 0x70EADF78271B2539ULL,
  122.         0x321A3E938EF113AAULL, 0x2E5EB66066087D7EULL, 0x6CAE578BCFE24BEDULL,
  123.         0xABBF75B735DC1058ULL, 0xE94F945C9C3626CBULL, 0x676DD025684A91A1ULL,
  124.         0x259D31CEC1A0A732ULL, 0xE28C13F23B9EFC87ULL, 0xA07CF2199274CA14ULL,
  125.         0x167FF3EACBAF2AF1ULL, 0x548F120162451C62ULL, 0x939E303D987B47D7ULL,
  126.         0xD16ED1D631917144ULL, 0x5F4C95AFC5EDC62EULL, 0x1DBC74446C07F0BDULL,
  127.         0xDAAD56789639AB08ULL, 0x985DB7933FD39D9BULL, 0x84193F60D72AF34FULL,
  128.         0xC6E9DE8B7EC0C5DCULL, 0x01F8FCB784FE9E69ULL, 0x43081D5C2D14A8FAULL,
  129.         0xCD2A5925D9681F90ULL, 0x8FDAB8CE70822903ULL, 0x48CB9AF28ABC72B6ULL,
  130.         0x0A3B7B1923564425ULL, 0x70428B155B4EAF1EULL, 0x32B26AFEF2A4998DULL,
  131.         0xF5A348C2089AC238ULL, 0xB753A929A170F4ABULL, 0x3971ED50550C43C1ULL,
  132.         0x7B810CBBFCE67552ULL, 0xBC902E8706D82EE7ULL, 0xFE60CF6CAF321874ULL,
  133.         0xE224479F47CB76A0ULL, 0xA0D4A674EE214033ULL, 0x67C58448141F1B86ULL,
  134.         0x253565A3BDF52D15ULL, 0xAB1721DA49899A7FULL, 0xE9E7C031E063ACECULL,
  135.         0x2EF6E20D1A5DF759ULL, 0x6C0603E6B3B7C1CAULL, 0xF6FAE5C07D3274CDULL,
  136.         0xB40A042BD4D8425EULL, 0x731B26172EE619EBULL, 0x31EBC7FC870C2F78ULL,
  137.         0xBFC9838573709812ULL, 0xFD39626EDA9AAE81ULL, 0x3A28405220A4F534ULL,
  138.         0x78D8A1B9894EC3A7ULL, 0x649C294A61B7AD73ULL, 0x266CC8A1C85D9BE0ULL,
  139.         0xE17DEA9D3263C055ULL, 0xA38D0B769B89F6C6ULL, 0x2DAF4F0F6FF541ACULL,
  140.         0x6F5FAEE4C61F773FULL, 0xA84E8CD83C212C8AULL, 0xEABE6D3395CB1A19ULL,
  141.         0x90C79D3FEDD3F122ULL, 0xD2377CD44439C7B1ULL, 0x15265EE8BE079C04ULL,
  142.         0x57D6BF0317EDAA97ULL, 0xD9F4FB7AE3911DFDULL, 0x9B041A914A7B2B6EULL,
  143.         0x5C1538ADB04570DBULL, 0x1EE5D94619AF4648ULL, 0x02A151B5F156289CULL,
  144.         0x4051B05E58BC1E0FULL, 0x87409262A28245BAULL, 0xC5B073890B687329ULL,
  145.         0x4B9237F0FF14C443ULL, 0x0962D61B56FEF2D0ULL, 0xCE73F427ACC0A965ULL,
  146.         0x8C8315CC052A9FF6ULL, 0x3A80143F5CF17F13ULL, 0x7870F5D4F51B4980ULL,
  147.         0xBF61D7E80F251235ULL, 0xFD913603A6CF24A6ULL, 0x73B3727A52B393CCULL,
  148.         0x31439391FB59A55FULL, 0xF652B1AD0167FEEAULL, 0xB4A25046A88DC879ULL,
  149.         0xA8E6D8B54074A6ADULL, 0xEA16395EE99E903EULL, 0x2D071B6213A0CB8BULL,
  150.         0x6FF7FA89BA4AFD18ULL, 0xE1D5BEF04E364A72ULL, 0xA3255F1BE7DC7CE1ULL,
  151.         0x64347D271DE22754ULL, 0x26C49CCCB40811C7ULL, 0x5CBD6CC0CC10FAFCULL,
  152.         0x1E4D8D2B65FACC6FULL, 0xD95CAF179FC497DAULL, 0x9BAC4EFC362EA149ULL,
  153.         0x158E0A85C2521623ULL, 0x577EEB6E6BB820B0ULL, 0x906FC95291867B05ULL,
  154.         0xD29F28B9386C4D96ULL, 0xCEDBA04AD0952342ULL, 0x8C2B41A1797F15D1ULL,
  155.         0x4B3A639D83414E64ULL, 0x09CA82762AAB78F7ULL, 0x87E8C60FDED7CF9DULL,
  156.         0xC51827E4773DF90EULL, 0x020905D88D03A2BBULL, 0x40F9E43324E99428ULL,
  157.         0x2CFFE7D5975E55E2ULL, 0x6E0F063E3EB46371ULL, 0xA91E2402C48A38C4ULL,
  158.         0xEBEEC5E96D600E57ULL, 0x65CC8190991CB93DULL, 0x273C607B30F68FAEULL,
  159.         0xE02D4247CAC8D41BULL, 0xA2DDA3AC6322E288ULL, 0xBE992B5F8BDB8C5CULL,
  160.         0xFC69CAB42231BACFULL, 0x3B78E888D80FE17AULL, 0x7988096371E5D7E9ULL,
  161.         0xF7AA4D1A85996083ULL, 0xB55AACF12C735610ULL, 0x724B8ECDD64D0DA5ULL,
  162.         0x30BB6F267FA73B36ULL, 0x4AC29F2A07BFD00DULL, 0x08327EC1AE55E69EULL,
  163.         0xCF235CFD546BBD2BULL, 0x8DD3BD16FD818BB8ULL, 0x03F1F96F09FD3CD2ULL,
  164.         0x41011884A0170A41ULL, 0x86103AB85A2951F4ULL, 0xC4E0DB53F3C36767ULL,
  165.         0xD8A453A01B3A09B3ULL, 0x9A54B24BB2D03F20ULL, 0x5D45907748EE6495ULL,
  166.         0x1FB5719CE1045206ULL, 0x919735E51578E56CULL, 0xD367D40EBC92D3FFULL,
  167.         0x1476F63246AC884AULL, 0x568617D9EF46BED9ULL, 0xE085162AB69D5E3CULL,
  168.         0xA275F7C11F7768AFULL, 0x6564D5FDE549331AULL, 0x279434164CA30589ULL,
  169.         0xA9B6706FB8DFB2E3ULL, 0xEB46918411358470ULL, 0x2C57B3B8EB0BDFC5ULL,
  170.         0x6EA7525342E1E956ULL, 0x72E3DAA0AA188782ULL, 0x30133B4B03F2B111ULL,
  171.         0xF7021977F9CCEAA4ULL, 0xB5F2F89C5026DC37ULL, 0x3BD0BCE5A45A6B5DULL,
  172.         0x79205D0E0DB05DCEULL, 0xBE317F32F78E067BULL, 0xFCC19ED95E6430E8ULL,
  173.         0x86B86ED5267CDBD3ULL, 0xC4488F3E8F96ED40ULL, 0x0359AD0275A8B6F5ULL,
  174.         0x41A94CE9DC428066ULL, 0xCF8B0890283E370CULL, 0x8D7BE97B81D4019FULL,
  175.         0x4A6ACB477BEA5A2AULL, 0x089A2AACD2006CB9ULL, 0x14DEA25F3AF9026DULL,
  176.         0x562E43B4931334FEULL, 0x913F6188692D6F4BULL, 0xD3CF8063C0C759D8ULL,
  177.         0x5DEDC41A34BBEEB2ULL, 0x1F1D25F19D51D821ULL, 0xD80C07CD676F8394ULL,
  178.         0x9AFCE626CE85B507ULL
  179. };
  180.  
  181. /*
  182.  * ECMA 182 CRC64, taken from https://searchcode.com/file/68313281/lib/crc64.c/
  183.  */
  184. uint64_t crc64(const unsigned char* data, size_t len)
  185. {
  186.         uint64_t crc = 0;
  187.  
  188.         while (len--) {
  189.                 int i = ((int)(crc >> 56) ^ *data++) & 0xFF;
  190.                 crc = crc64_tab[i] ^ (crc << 8);
  191.         }
  192.  
  193.         return crc;
  194. }
  195.  
  196.  
  197. int obfuscation_version(PARM_T* pparm) {
  198.         uint32_t obfusc_info = pparm->unknown2;
  199.  
  200.         if (obfusc_info == 0x00000000) { // 00 00 00 00
  201.                 // Photoshop FilterFactory default initialization of field "unknown2"
  202.                 // (no obfuscation)
  203.                 return 0;
  204.         }
  205.         else if (obfusc_info == 0x00000001) { // 01 00 00 00
  206.                 // Premiere FilterFactory default initialization of field "unknown1" (it is at the offset of Photoshop's "unknown2")
  207.                 // (no obfuscation)
  208.                 return 0;
  209.         }
  210.         else if (obfusc_info == 0x90E364A3) { // A3 64 E3 90
  211.                 // Version 1 obfuscation (Filter Foundry 1.4b8,9,10)
  212.                 return 1;
  213.         }
  214.         else if (obfusc_info == 0xE2CFCA34) { // 34 CA CF E2
  215.                 // Version 2 obfuscation (Filter Foundry 1.7b1)
  216.                 return 2;
  217.         }
  218.         else if ((obfusc_info >= 4) && (obfusc_info <= 0xFF)) { // xx 00 00 00
  219.                 // Version 4 obfuscation (Filter Foundry 1.7.0.7)
  220.                 // Version 5 obfuscation (Filter Foundry 1.7.0.8)
  221.                 // Version 6 obfuscation (Filter Foundry 1.7.0.10)
  222.                 // Future: Version 7, 8, ... 255
  223.                 return obfusc_info;
  224.         }
  225.         else {
  226.                 // Version 3 obfuscation (Filter Foundry 1.7.0.5)
  227.                 // obfusc_info is the srand() seed and is equal to the time(0) build timestamp
  228.                 return 3;
  229.         }
  230. }
  231.  
  232. uint64_t obfusc(PARM_T* pparm) {
  233.         // Version 6 obfuscation (Introduced in Filter Foundry 1.7.0.10)
  234.  
  235.         unsigned char* p;
  236.         uint64_t initial_seed, rolseed;
  237.         uint32_t xorseed;
  238.  
  239.         pparm->unknown1 = 0;
  240.         pparm->unknown2 = 0;
  241.         pparm->unknown3 = 0;
  242.  
  243. #ifdef MAC_ENV
  244.         // Currently, make_mac.c does not implement modifying the executable code (TODO),
  245.         // so we will use the default initial_seed!
  246.         initial_seed = cObfuscSeed;
  247. #else
  248.         // Give always the same seed if the parameters are the same. No random values.
  249.         // This initial seed will be returned and built into the executable code by make_win.c
  250.         initial_seed = crc64((unsigned char*)pparm, sizeof(PARM_T));
  251. #endif
  252.  
  253.         // AFTER unknown1-3 have been set to 0, calculate the checksum!
  254.         pparm->unknown1 = crc32b((char*)pparm, sizeof(PARM_T));
  255.  
  256.         xorseed = initial_seed & 0xFFFFFFFF;
  257.         p = (unsigned char*)pparm;
  258.         xorshift(&p, &xorseed, sizeof(PARM_T));
  259.  
  260.         rolseed = initial_seed;
  261.         p = (unsigned char*)pparm;
  262.         rolshift(&p, &rolseed, sizeof(PARM_T));
  263.  
  264.         pparm->unknown2 = 6; // obfusc version
  265.  
  266.         return initial_seed;
  267. }
  268.  
  269. void deobfusc(PARM_T* pparm) {
  270.         uint32_t obfusc_version;
  271.         size_t size = sizeof(PARM_T);
  272.  
  273.         obfusc_version = obfuscation_version(pparm);
  274.  
  275.         switch (obfusc_version) {
  276.                 case 0:
  277.                         // no obfuscation
  278.                         return;
  279.                 case 1: {
  280.                         // Version 1 obfuscation (Filter Foundry 1.4b8,9,10)
  281.                         // Filter built with VC++ (official release by Toby Thain)
  282.  
  283.                         unsigned char* p;
  284.                         size_t i;
  285.                         uint32_t seed;
  286.  
  287.                         seed = 0xdc43df3c;
  288.  
  289.                         for (i = size, p = (unsigned char*)pparm; i--;) {
  290.                                 *p++ ^= rand_msvcc(&seed);
  291.                         }
  292.                         break;
  293.                 }
  294.                 case 2: {
  295.                         // Version 2 obfuscation (Filter Foundry 1.7b1)
  296.                         // Compiler independent
  297.  
  298.                         unsigned char* p;
  299.                         size_t i;
  300.                         uint32_t seed;
  301.  
  302.                         seed = 0x95d4a68f;
  303.  
  304.                         for (i = size, p = (unsigned char*)pparm; i--;) {
  305.                                 seed ^= seed << 13;
  306.                                 seed ^= seed >> 17;
  307.                                 seed ^= seed << 5;
  308.                                 *p++ ^= seed;
  309.                         }
  310.                         break;
  311.                 }
  312.                 case 3: {
  313.                         // Version 3 obfuscation (Filter Foundry 1.7.0.5)
  314.                         // NO loading of other implementation supported, but that doesn't matter since
  315.                         // obfuscation and protection is combined in Filter Factory >= 1.7.0.5.
  316.                         // Using rand() is more secure, because it differs from compiler to compiler, so
  317.                         // it is harder to read a protected 8BF plugin.
  318.                         // Note that rand() in combination with srand() is deterministic, so it is safe
  319.                         // to use it: https://stackoverflow.com/questions/55438293/does-rand-function-in-c-follows-non-determinstc-algorithm
  320.                         // Note: 32-Bit FF is built using OpenWatcom (to support Win95), while 64-Bit FF is built using Microsoft Visual C++
  321.  
  322.                         unsigned char* p;
  323.                         size_t i;
  324.                         uint32_t seed;
  325.                         size_t seed_position;
  326.  
  327.                         seed = pparm->unknown2;
  328.                         seed_position = offsetof(PARM_T, unknown2); // = offsetof(PARM_T_PREMIERE, unknown1)
  329.  
  330.                         srand(seed);
  331.  
  332.                         p = (unsigned char*)pparm;
  333.                         for (i = 0; i < seed_position; i++) {
  334.                                 *p++ ^= (int)(rand() * 1.0 / ((double)RAND_MAX + 1) * 256);
  335.                         }
  336.                         *((uint32_t*)p) = 0; // here was the seed. Fill it with 0x00000000
  337.                         p += 4;
  338.                         for (i = 0; i < size - seed_position - 4; i++) {
  339.                                 *p++ ^= (int)(rand() * 1.0 / ((double)RAND_MAX + 1) * 256);
  340.                         }
  341.  
  342.                         break;
  343.                 }
  344.                 case 4:
  345.                 case 5: {
  346.                         // Version 4 obfuscation (Filter Foundry 1.7.0.7)
  347.                         // Version 5 obfuscation (Filter Foundry 1.7.0.8)
  348.                         // Not compiler dependent, but individual for each standalone filter
  349.                         // It is important that this code works for both x86 and x64 indepdently from the used compiler,
  350.                         // otherwise, the cross-make x86/x64 won't work!
  351.                         // Version 5 contains a seed requirement (checksum).
  352.  
  353.                         unsigned char* p;
  354.                         size_t seed_position;
  355.                         uint32_t seed, initial_seed;
  356.  
  357.                         initial_seed = cObfuscSeed & 0xFFFFFFFF; // this value will be manipulated during the building of each individual filter (see make_win.c)
  358.  
  359.                         seed = initial_seed;
  360.                         seed_position = offsetof(PARM_T, unknown2); // = offsetof(PARM_T_PREMIERE, unknown1)
  361.  
  362.                         if (obfusc_version == 5) {
  363.                                 // make v4 and v5 intentionally incompatible to avoid a downgrade-attack
  364.                                 seed ^= 0xFFFFFFFF;
  365.                         }
  366.  
  367.                         p = (unsigned char*)pparm;
  368.                         xorshift(&p, &seed, seed_position);
  369.                         *((uint32_t*)p) = 0; // here was the version info. Fill it with 0x00000000
  370.                         p += 4; // obfusc info was 4 or 5
  371.                         xorshift(&p, &seed, size - seed_position - 4);
  372.  
  373.                         if (obfusc_version == 5) {
  374.                                 pparm->unknown2 = 0; // make sure crc32b matches always
  375.                                 if (crc32b((char*)pparm, sizeof(PARM_T)) != initial_seed) {
  376.                                         // Integrity check failed!
  377.                                         memset(pparm, 0, sizeof(PARM_T)); // invalidate everything
  378.                                 }
  379.                         }
  380.  
  381.                         break;
  382.                 }
  383.                 case 6: {
  384.                         // Version 6 obfuscation (Filter Foundry 1.7.0.10)
  385.                         // Not compiler dependent, but individual for each standalone filter
  386.                         // It is important that this code works for both x86 and x64 indepdently from the used compiler,
  387.                         // otherwise, the cross-make x86/x64 won't work!
  388.  
  389.                         unsigned char* p;
  390.                         uint32_t xorseed, checksum;
  391.                         uint64_t initial_seed, rolseed;
  392.  
  393.                         initial_seed = cObfuscSeed; // this value will be manipulated during the building of each individual filter (see make_win.c)
  394.  
  395.                         rolseed = initial_seed;
  396.                         p = (unsigned char*)pparm;
  397.                         rolshift(&p, &rolseed, sizeof(PARM_T));
  398.  
  399.                         xorseed = initial_seed & 0xFFFFFFFF;
  400.                         p = (unsigned char*)pparm;
  401.                         xorshift(&p, &xorseed, sizeof(PARM_T));
  402.  
  403.                         checksum = pparm->unknown1;
  404.  
  405.                         pparm->unknown1 = 0;
  406.                         pparm->unknown2 = 0;
  407.                         pparm->unknown3 = 0;
  408.  
  409.                         if (checksum != crc32b((char*)pparm, sizeof(PARM_T))) {
  410.                                 // Integrity check failed!
  411.                                 memset(pparm, 0, sizeof(PARM_T)); // invalidate everything
  412.                         }
  413.  
  414.                         break;
  415.                 }
  416.                 default: {
  417.                         // Obfuscation version unexpected!
  418.                         memset(pparm, 0, sizeof(PARM_T)); // invalidate everything
  419.  
  420.                         // If "return" is present: Calling function will receive an invalid cbSize value, hence showing "incompatible obfuscation"
  421.                         // If "return" is not present: Then the code below will set a correct cbSize and iProtect flag if obfusc_version>=3, which will raise the error "filter is protected"
  422.                         return;
  423.                 }
  424.         }
  425.  
  426.         if ((pparm->cbSize != PARM_SIZE) &&
  427.                 (pparm->cbSize != PARM_SIZE_PREMIERE) &&
  428.                 (pparm->cbSize != PARM_SIG_MAC)) {
  429.                 memset(pparm, 0, sizeof(PARM_T)); // invalidate everything
  430.         }
  431.  
  432.         if (obfusc_version >= 3) {
  433.                 // Filter Foundry >= 1.7.0.5 combines obfuscation and protection
  434.                 // when a standalone filter is built. Theoretically, you can un-protect a
  435.                 // plugin, even if it is obfuscated, just by bit-flipping the LSB of byte 0x164.
  436.                 // Therefore, we enforce that the plugin is protected!
  437.                 pparm->iProtected = 1;
  438.  
  439.                 // Furthermore, if obfuscation 3+ failed (since the seed is individual for each 8BF file),
  440.                 // we still want that load_*.c is able to detect pparm->iProtected instead
  441.                 // of throwing the error "Incompatible obfuscation".
  442.                 pparm->cbSize = PARM_SIZE;
  443.                 pparm->standalone = 1;
  444.         }
  445.  
  446.         if (obfusc_version >= 1) {
  447.                 // information was lost due to obfuscation. Make sure it is zero.
  448.                 pparm->unknown2 = 0;
  449.         }
  450.  
  451.         if (obfusc_version >= 6) {
  452.                 // information was lost due to checksum. Make sure it is zero.
  453.                 pparm->unknown1 = 0;
  454.         }
  455. }
  456.