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Rev | Author | Line No. | Line |
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292 | daniel-mar | 1 | /* |
2 | This file is part of "Filter Foundry", a filter plugin for Adobe Photoshop |
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3 | Copyright (C) 2003-2009 Toby Thain, toby@telegraphics.com.au |
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4 | Copyright (C) 2018-2021 Daniel Marschall, ViaThinkSoft |
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5 | |||
6 | This program is free software; you can redistribute it and/or modify |
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7 | it under the terms of the GNU General Public License as published by |
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8 | the Free Software Foundation; either version 2 of the License, or |
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9 | (at your option) any later version. |
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10 | |||
11 | This program is distributed in the hope that it will be useful, |
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12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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14 | GNU General Public License for more details. |
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15 | |||
16 | You should have received a copy of the GNU General Public License |
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17 | along with this program; if not, write to the Free Software |
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18 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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19 | */ |
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20 | |||
21 | #include <stddef.h> |
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22 | #include <stdint.h> |
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23 | |||
24 | #include "ff.h" |
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25 | |||
312 | daniel-mar | 26 | // this value will be manipulated during the building of each individual filter (see make_win.c) |
351 | daniel-mar | 27 | // It should be aligned to 4 |
348 | daniel-mar | 28 | const volatile uint64_t cObfuscSeed = 0x38AD972A52830517ull; |
292 | daniel-mar | 29 | |
30 | int rand_msvcc(unsigned int* seed) { |
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31 | *seed = *seed * 214013L + 2531011L; |
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32 | return (*seed >> 16) & 0x7fff; /* Scale between 0 and RAND_MAX */ |
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33 | } |
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34 | |||
35 | int rand_openwatcom(unsigned int* seed) { |
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36 | // https://github.com/open-watcom/open-watcom-v2/blob/master/bld/clib/math/c/rand.c |
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37 | *seed = *seed * 1103515245L + 12345L; |
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38 | return (*seed >> 16) & 0x7fff; /* Scale between 0 and RAND_MAX */ |
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39 | } |
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40 | |||
293 | daniel-mar | 41 | void xorshift(unsigned char** p, uint32_t* x32, size_t num) { |
292 | daniel-mar | 42 | size_t i; |
43 | unsigned char* x = *p; |
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44 | for (i = 0; i < num; i++) { |
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45 | // https://de.wikipedia.org/wiki/Xorshift |
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46 | *x32 ^= *x32 << 13; |
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47 | *x32 ^= *x32 >> 17; |
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48 | *x32 ^= *x32 << 5; |
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49 | *x++ ^= *x32; |
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50 | } |
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51 | *p = x; |
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52 | } |
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53 | |||
348 | daniel-mar | 54 | #ifndef CHAR_BIT |
55 | #define CHAR_BIT 8 |
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56 | #endif |
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57 | |||
58 | uint64_t rol_u64(uint64_t value, uint64_t by) { |
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59 | return value << by | value >> (sizeof(uint64_t) * CHAR_BIT - by); |
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60 | } |
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61 | |||
62 | void rolshift(unsigned char** p, uint64_t* x64, size_t num) { |
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63 | size_t i; |
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64 | unsigned char* x = *p; |
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65 | for (i = 0; i < num; i++) { |
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66 | *x++ ^= *x64; |
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67 | *x64 = rol_u64(*x64, 1); |
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68 | } |
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69 | *p = x; |
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70 | } |
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71 | |||
311 | daniel-mar | 72 | uint32_t crc32b(char *data, int nLength) { |
73 | int i, j, k; |
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318 | daniel-mar | 74 | uint32_t crc, mask; |
75 | char byte; |
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311 | daniel-mar | 76 | |
77 | i = 0; |
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78 | crc = 0xFFFFFFFF; |
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79 | |||
80 | for(k=0;k<nLength;k++) { |
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81 | byte = data[k]; |
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82 | crc = crc ^ byte; |
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83 | for (j = 7; j >= 0; j--) { |
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318 | daniel-mar | 84 | mask = (-1) * (crc & 1); |
311 | daniel-mar | 85 | crc = (crc >> 1) ^ (0xEDB88320 & mask); |
86 | } |
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87 | i++; |
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88 | } |
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89 | return ~crc; |
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90 | } |
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91 | |||
349 | daniel-mar | 92 | static const uint64_t crc64_tab[256] = { |
93 | 0x0000000000000000ULL, 0x42F0E1EBA9EA3693ULL, 0x85E1C3D753D46D26ULL, |
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94 | 0xC711223CFA3E5BB5ULL, 0x493366450E42ECDFULL, 0x0BC387AEA7A8DA4CULL, |
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95 | 0xCCD2A5925D9681F9ULL, 0x8E224479F47CB76AULL, 0x9266CC8A1C85D9BEULL, |
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96 | 0xD0962D61B56FEF2DULL, 0x17870F5D4F51B498ULL, 0x5577EEB6E6BB820BULL, |
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97 | 0xDB55AACF12C73561ULL, 0x99A54B24BB2D03F2ULL, 0x5EB4691841135847ULL, |
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98 | 0x1C4488F3E8F96ED4ULL, 0x663D78FF90E185EFULL, 0x24CD9914390BB37CULL, |
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99 | 0xE3DCBB28C335E8C9ULL, 0xA12C5AC36ADFDE5AULL, 0x2F0E1EBA9EA36930ULL, |
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100 | 0x6DFEFF5137495FA3ULL, 0xAAEFDD6DCD770416ULL, 0xE81F3C86649D3285ULL, |
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101 | 0xF45BB4758C645C51ULL, 0xB6AB559E258E6AC2ULL, 0x71BA77A2DFB03177ULL, |
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102 | 0x334A9649765A07E4ULL, 0xBD68D2308226B08EULL, 0xFF9833DB2BCC861DULL, |
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103 | 0x388911E7D1F2DDA8ULL, 0x7A79F00C7818EB3BULL, 0xCC7AF1FF21C30BDEULL, |
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104 | 0x8E8A101488293D4DULL, 0x499B3228721766F8ULL, 0x0B6BD3C3DBFD506BULL, |
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105 | 0x854997BA2F81E701ULL, 0xC7B97651866BD192ULL, 0x00A8546D7C558A27ULL, |
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106 | 0x4258B586D5BFBCB4ULL, 0x5E1C3D753D46D260ULL, 0x1CECDC9E94ACE4F3ULL, |
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107 | 0xDBFDFEA26E92BF46ULL, 0x990D1F49C77889D5ULL, 0x172F5B3033043EBFULL, |
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108 | 0x55DFBADB9AEE082CULL, 0x92CE98E760D05399ULL, 0xD03E790CC93A650AULL, |
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109 | 0xAA478900B1228E31ULL, 0xE8B768EB18C8B8A2ULL, 0x2FA64AD7E2F6E317ULL, |
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110 | 0x6D56AB3C4B1CD584ULL, 0xE374EF45BF6062EEULL, 0xA1840EAE168A547DULL, |
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111 | 0x66952C92ECB40FC8ULL, 0x2465CD79455E395BULL, 0x3821458AADA7578FULL, |
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112 | 0x7AD1A461044D611CULL, 0xBDC0865DFE733AA9ULL, 0xFF3067B657990C3AULL, |
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113 | 0x711223CFA3E5BB50ULL, 0x33E2C2240A0F8DC3ULL, 0xF4F3E018F031D676ULL, |
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114 | 0xB60301F359DBE0E5ULL, 0xDA050215EA6C212FULL, 0x98F5E3FE438617BCULL, |
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115 | 0x5FE4C1C2B9B84C09ULL, 0x1D14202910527A9AULL, 0x93366450E42ECDF0ULL, |
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116 | 0xD1C685BB4DC4FB63ULL, 0x16D7A787B7FAA0D6ULL, 0x5427466C1E109645ULL, |
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117 | 0x4863CE9FF6E9F891ULL, 0x0A932F745F03CE02ULL, 0xCD820D48A53D95B7ULL, |
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118 | 0x8F72ECA30CD7A324ULL, 0x0150A8DAF8AB144EULL, 0x43A04931514122DDULL, |
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119 | 0x84B16B0DAB7F7968ULL, 0xC6418AE602954FFBULL, 0xBC387AEA7A8DA4C0ULL, |
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120 | 0xFEC89B01D3679253ULL, 0x39D9B93D2959C9E6ULL, 0x7B2958D680B3FF75ULL, |
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121 | 0xF50B1CAF74CF481FULL, 0xB7FBFD44DD257E8CULL, 0x70EADF78271B2539ULL, |
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122 | 0x321A3E938EF113AAULL, 0x2E5EB66066087D7EULL, 0x6CAE578BCFE24BEDULL, |
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123 | 0xABBF75B735DC1058ULL, 0xE94F945C9C3626CBULL, 0x676DD025684A91A1ULL, |
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124 | 0x259D31CEC1A0A732ULL, 0xE28C13F23B9EFC87ULL, 0xA07CF2199274CA14ULL, |
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125 | 0x167FF3EACBAF2AF1ULL, 0x548F120162451C62ULL, 0x939E303D987B47D7ULL, |
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126 | 0xD16ED1D631917144ULL, 0x5F4C95AFC5EDC62EULL, 0x1DBC74446C07F0BDULL, |
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127 | 0xDAAD56789639AB08ULL, 0x985DB7933FD39D9BULL, 0x84193F60D72AF34FULL, |
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128 | 0xC6E9DE8B7EC0C5DCULL, 0x01F8FCB784FE9E69ULL, 0x43081D5C2D14A8FAULL, |
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129 | 0xCD2A5925D9681F90ULL, 0x8FDAB8CE70822903ULL, 0x48CB9AF28ABC72B6ULL, |
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130 | 0x0A3B7B1923564425ULL, 0x70428B155B4EAF1EULL, 0x32B26AFEF2A4998DULL, |
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131 | 0xF5A348C2089AC238ULL, 0xB753A929A170F4ABULL, 0x3971ED50550C43C1ULL, |
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132 | 0x7B810CBBFCE67552ULL, 0xBC902E8706D82EE7ULL, 0xFE60CF6CAF321874ULL, |
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133 | 0xE224479F47CB76A0ULL, 0xA0D4A674EE214033ULL, 0x67C58448141F1B86ULL, |
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134 | 0x253565A3BDF52D15ULL, 0xAB1721DA49899A7FULL, 0xE9E7C031E063ACECULL, |
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135 | 0x2EF6E20D1A5DF759ULL, 0x6C0603E6B3B7C1CAULL, 0xF6FAE5C07D3274CDULL, |
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136 | 0xB40A042BD4D8425EULL, 0x731B26172EE619EBULL, 0x31EBC7FC870C2F78ULL, |
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137 | 0xBFC9838573709812ULL, 0xFD39626EDA9AAE81ULL, 0x3A28405220A4F534ULL, |
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138 | 0x78D8A1B9894EC3A7ULL, 0x649C294A61B7AD73ULL, 0x266CC8A1C85D9BE0ULL, |
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139 | 0xE17DEA9D3263C055ULL, 0xA38D0B769B89F6C6ULL, 0x2DAF4F0F6FF541ACULL, |
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140 | 0x6F5FAEE4C61F773FULL, 0xA84E8CD83C212C8AULL, 0xEABE6D3395CB1A19ULL, |
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141 | 0x90C79D3FEDD3F122ULL, 0xD2377CD44439C7B1ULL, 0x15265EE8BE079C04ULL, |
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142 | 0x57D6BF0317EDAA97ULL, 0xD9F4FB7AE3911DFDULL, 0x9B041A914A7B2B6EULL, |
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143 | 0x5C1538ADB04570DBULL, 0x1EE5D94619AF4648ULL, 0x02A151B5F156289CULL, |
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144 | 0x4051B05E58BC1E0FULL, 0x87409262A28245BAULL, 0xC5B073890B687329ULL, |
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145 | 0x4B9237F0FF14C443ULL, 0x0962D61B56FEF2D0ULL, 0xCE73F427ACC0A965ULL, |
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146 | 0x8C8315CC052A9FF6ULL, 0x3A80143F5CF17F13ULL, 0x7870F5D4F51B4980ULL, |
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147 | 0xBF61D7E80F251235ULL, 0xFD913603A6CF24A6ULL, 0x73B3727A52B393CCULL, |
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148 | 0x31439391FB59A55FULL, 0xF652B1AD0167FEEAULL, 0xB4A25046A88DC879ULL, |
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149 | 0xA8E6D8B54074A6ADULL, 0xEA16395EE99E903EULL, 0x2D071B6213A0CB8BULL, |
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150 | 0x6FF7FA89BA4AFD18ULL, 0xE1D5BEF04E364A72ULL, 0xA3255F1BE7DC7CE1ULL, |
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151 | 0x64347D271DE22754ULL, 0x26C49CCCB40811C7ULL, 0x5CBD6CC0CC10FAFCULL, |
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152 | 0x1E4D8D2B65FACC6FULL, 0xD95CAF179FC497DAULL, 0x9BAC4EFC362EA149ULL, |
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153 | 0x158E0A85C2521623ULL, 0x577EEB6E6BB820B0ULL, 0x906FC95291867B05ULL, |
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154 | 0xD29F28B9386C4D96ULL, 0xCEDBA04AD0952342ULL, 0x8C2B41A1797F15D1ULL, |
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155 | 0x4B3A639D83414E64ULL, 0x09CA82762AAB78F7ULL, 0x87E8C60FDED7CF9DULL, |
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156 | 0xC51827E4773DF90EULL, 0x020905D88D03A2BBULL, 0x40F9E43324E99428ULL, |
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157 | 0x2CFFE7D5975E55E2ULL, 0x6E0F063E3EB46371ULL, 0xA91E2402C48A38C4ULL, |
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158 | 0xEBEEC5E96D600E57ULL, 0x65CC8190991CB93DULL, 0x273C607B30F68FAEULL, |
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159 | 0xE02D4247CAC8D41BULL, 0xA2DDA3AC6322E288ULL, 0xBE992B5F8BDB8C5CULL, |
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160 | 0xFC69CAB42231BACFULL, 0x3B78E888D80FE17AULL, 0x7988096371E5D7E9ULL, |
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161 | 0xF7AA4D1A85996083ULL, 0xB55AACF12C735610ULL, 0x724B8ECDD64D0DA5ULL, |
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162 | 0x30BB6F267FA73B36ULL, 0x4AC29F2A07BFD00DULL, 0x08327EC1AE55E69EULL, |
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163 | 0xCF235CFD546BBD2BULL, 0x8DD3BD16FD818BB8ULL, 0x03F1F96F09FD3CD2ULL, |
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164 | 0x41011884A0170A41ULL, 0x86103AB85A2951F4ULL, 0xC4E0DB53F3C36767ULL, |
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165 | 0xD8A453A01B3A09B3ULL, 0x9A54B24BB2D03F20ULL, 0x5D45907748EE6495ULL, |
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166 | 0x1FB5719CE1045206ULL, 0x919735E51578E56CULL, 0xD367D40EBC92D3FFULL, |
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167 | 0x1476F63246AC884AULL, 0x568617D9EF46BED9ULL, 0xE085162AB69D5E3CULL, |
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168 | 0xA275F7C11F7768AFULL, 0x6564D5FDE549331AULL, 0x279434164CA30589ULL, |
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169 | 0xA9B6706FB8DFB2E3ULL, 0xEB46918411358470ULL, 0x2C57B3B8EB0BDFC5ULL, |
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170 | 0x6EA7525342E1E956ULL, 0x72E3DAA0AA188782ULL, 0x30133B4B03F2B111ULL, |
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171 | 0xF7021977F9CCEAA4ULL, 0xB5F2F89C5026DC37ULL, 0x3BD0BCE5A45A6B5DULL, |
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172 | 0x79205D0E0DB05DCEULL, 0xBE317F32F78E067BULL, 0xFCC19ED95E6430E8ULL, |
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173 | 0x86B86ED5267CDBD3ULL, 0xC4488F3E8F96ED40ULL, 0x0359AD0275A8B6F5ULL, |
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174 | 0x41A94CE9DC428066ULL, 0xCF8B0890283E370CULL, 0x8D7BE97B81D4019FULL, |
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175 | 0x4A6ACB477BEA5A2AULL, 0x089A2AACD2006CB9ULL, 0x14DEA25F3AF9026DULL, |
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176 | 0x562E43B4931334FEULL, 0x913F6188692D6F4BULL, 0xD3CF8063C0C759D8ULL, |
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177 | 0x5DEDC41A34BBEEB2ULL, 0x1F1D25F19D51D821ULL, 0xD80C07CD676F8394ULL, |
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178 | 0x9AFCE626CE85B507ULL |
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179 | }; |
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180 | |||
181 | /* |
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182 | * ECMA 182 CRC64, taken from https://searchcode.com/file/68313281/lib/crc64.c/ |
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183 | */ |
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184 | uint64_t crc64(const unsigned char* data, size_t len) |
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185 | { |
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186 | uint64_t crc = 0; |
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187 | |||
188 | while (len--) { |
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189 | int i = ((int)(crc >> 56) ^ *data++) & 0xFF; |
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190 | crc = crc64_tab[i] ^ (crc << 8); |
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191 | } |
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192 | |||
193 | return crc; |
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194 | } |
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195 | |||
352 | daniel-mar | 196 | |
197 | int obfuscation_version(PARM_T* pparm) { |
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198 | uint32_t obfusc_info = pparm->unknown2; |
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199 | |||
200 | if (obfusc_info == 0x00000000) { // 00 00 00 00 |
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201 | // Photoshop FilterFactory default initialization of field "unknown2" |
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202 | // (no obfuscation) |
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203 | return 0; |
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204 | } |
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205 | else if (obfusc_info == 0x00000001) { // 01 00 00 00 |
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206 | // Premiere FilterFactory default initialization of field "unknown1" (it is at the offset of Photoshop's "unknown2") |
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207 | // (no obfuscation) |
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208 | return 0; |
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209 | } |
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210 | else if (obfusc_info == 0x90E364A3) { // A3 64 E3 90 |
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211 | // Version 1 obfuscation (Filter Foundry 1.4b8,9,10) |
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212 | return 1; |
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213 | } |
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214 | else if (obfusc_info == 0xE2CFCA34) { // 34 CA CF E2 |
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215 | // Version 2 obfuscation (Filter Foundry 1.7b1) |
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216 | return 2; |
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217 | } |
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218 | else if ((obfusc_info >= 4) && (obfusc_info <= 0xFF)) { // xx 00 00 00 |
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219 | // Version 4 obfuscation (Filter Foundry 1.7.0.7) |
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220 | // Version 5 obfuscation (Filter Foundry 1.7.0.8) |
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221 | // Version 6 obfuscation (Filter Foundry 1.7.0.10) |
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489 | daniel-mar | 222 | // Future: Version 7, 8, ... 255 |
352 | daniel-mar | 223 | return obfusc_info; |
224 | } |
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225 | else { |
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226 | // Version 3 obfuscation (Filter Foundry 1.7.0.5) |
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227 | // obfusc_info is the srand() seed and is equal to the time(0) build timestamp |
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228 | return 3; |
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229 | } |
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230 | } |
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231 | |||
347 | daniel-mar | 232 | uint64_t obfusc(PARM_T* pparm) { |
233 | // Version 6 obfuscation (Introduced in Filter Foundry 1.7.0.10) |
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292 | daniel-mar | 234 | |
235 | unsigned char* p; |
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348 | daniel-mar | 236 | uint64_t initial_seed, rolseed; |
350 | daniel-mar | 237 | uint32_t xorseed; |
347 | daniel-mar | 238 | |
349 | daniel-mar | 239 | pparm->unknown1 = 0; |
240 | pparm->unknown2 = 0; |
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241 | pparm->unknown3 = 0; |
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242 | |||
292 | daniel-mar | 243 | #ifdef MAC_ENV |
347 | daniel-mar | 244 | // Currently, make_mac.c does not implement modifying the executable code (TODO), |
245 | // so we will use the default initial_seed! |
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348 | daniel-mar | 246 | initial_seed = cObfuscSeed; |
292 | daniel-mar | 247 | #else |
347 | daniel-mar | 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 |
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350 | daniel-mar | 250 | initial_seed = crc64((unsigned char*)pparm, sizeof(PARM_T)); |
292 | daniel-mar | 251 | #endif |
252 | |||
347 | daniel-mar | 253 | // AFTER unknown1-3 have been set to 0, calculate the checksum! |
254 | pparm->unknown1 = crc32b((char*)pparm, sizeof(PARM_T)); |
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309 | daniel-mar | 255 | |
350 | daniel-mar | 256 | xorseed = initial_seed & 0xFFFFFFFF; |
292 | daniel-mar | 257 | p = (unsigned char*)pparm; |
350 | daniel-mar | 258 | xorshift(&p, &xorseed, sizeof(PARM_T)); |
292 | daniel-mar | 259 | |
348 | daniel-mar | 260 | rolseed = initial_seed; |
347 | daniel-mar | 261 | p = (unsigned char*)pparm; |
348 | daniel-mar | 262 | rolshift(&p, &rolseed, sizeof(PARM_T)); |
347 | daniel-mar | 263 | |
264 | pparm->unknown2 = 6; // obfusc version |
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265 | |||
292 | daniel-mar | 266 | return initial_seed; |
267 | } |
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268 | |||
269 | void deobfusc(PARM_T* pparm) { |
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309 | daniel-mar | 270 | uint32_t obfusc_version; |
292 | daniel-mar | 271 | size_t size = sizeof(PARM_T); |
272 | |||
293 | daniel-mar | 273 | obfusc_version = obfuscation_version(pparm); |
292 | daniel-mar | 274 | |
275 | switch (obfusc_version) { |
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276 | case 0: |
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277 | // no obfuscation |
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278 | return; |
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279 | case 1: { |
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280 | // Version 1 obfuscation (Filter Foundry 1.4b8,9,10) |
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281 | // Filter built with VC++ (official release by Toby Thain) |
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282 | |||
283 | unsigned char* p; |
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284 | size_t i; |
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309 | daniel-mar | 285 | uint32_t seed; |
292 | daniel-mar | 286 | |
287 | seed = 0xdc43df3c; |
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288 | |||
289 | for (i = size, p = (unsigned char*)pparm; i--;) { |
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290 | *p++ ^= rand_msvcc(&seed); |
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291 | } |
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292 | break; |
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293 | } |
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294 | case 2: { |
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295 | // Version 2 obfuscation (Filter Foundry 1.7b1) |
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296 | // Compiler independent |
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297 | |||
298 | unsigned char* p; |
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299 | size_t i; |
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309 | daniel-mar | 300 | uint32_t seed; |
292 | daniel-mar | 301 | |
302 | seed = 0x95d4a68f; |
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303 | |||
304 | for (i = size, p = (unsigned char*)pparm; i--;) { |
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305 | seed ^= seed << 13; |
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306 | seed ^= seed >> 17; |
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307 | seed ^= seed << 5; |
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308 | *p++ ^= seed; |
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309 | } |
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310 | break; |
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311 | } |
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312 | case 3: { |
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313 | // Version 3 obfuscation (Filter Foundry 1.7.0.5) |
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314 | // NO loading of other implementation supported, but that doesn't matter since |
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315 | // obfuscation and protection is combined in Filter Factory >= 1.7.0.5. |
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316 | // Using rand() is more secure, because it differs from compiler to compiler, so |
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317 | // it is harder to read a protected 8BF plugin. |
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318 | // Note that rand() in combination with srand() is deterministic, so it is safe |
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319 | // to use it: https://stackoverflow.com/questions/55438293/does-rand-function-in-c-follows-non-determinstc-algorithm |
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320 | // Note: 32-Bit FF is built using OpenWatcom (to support Win95), while 64-Bit FF is built using Microsoft Visual C++ |
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321 | |||
322 | unsigned char* p; |
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323 | size_t i; |
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309 | daniel-mar | 324 | uint32_t seed; |
292 | daniel-mar | 325 | size_t seed_position; |
326 | |||
327 | seed = pparm->unknown2; |
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328 | seed_position = offsetof(PARM_T, unknown2); // = offsetof(PARM_T_PREMIERE, unknown1) |
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329 | |||
330 | srand(seed); |
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329 | daniel-mar | 331 | |
292 | daniel-mar | 332 | p = (unsigned char*)pparm; |
351 | daniel-mar | 333 | for (i = 0; i < seed_position; i++) { |
334 | *p++ ^= (int)(rand() * 1.0 / ((double)RAND_MAX + 1) * 256); |
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335 | } |
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309 | daniel-mar | 336 | *((uint32_t*)p) = 0; // here was the seed. Fill it with 0x00000000 |
292 | daniel-mar | 337 | p += 4; |
351 | daniel-mar | 338 | for (i = 0; i < size - seed_position - 4; i++) { |
339 | *p++ ^= (int)(rand() * 1.0 / ((double)RAND_MAX + 1) * 256); |
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340 | } |
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329 | daniel-mar | 341 | |
292 | daniel-mar | 342 | break; |
343 | } |
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344 | case 4: |
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345 | case 5: { |
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346 | // Version 4 obfuscation (Filter Foundry 1.7.0.7) |
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347 | // Version 5 obfuscation (Filter Foundry 1.7.0.8) |
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489 | daniel-mar | 348 | // Not compiler dependent, but individual for each standalone filter |
292 | daniel-mar | 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! |
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351 | // Version 5 contains a seed requirement (checksum). |
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352 | |||
353 | unsigned char* p; |
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354 | size_t seed_position; |
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309 | daniel-mar | 355 | uint32_t seed, initial_seed; |
292 | daniel-mar | 356 | |
347 | daniel-mar | 357 | initial_seed = cObfuscSeed & 0xFFFFFFFF; // this value will be manipulated during the building of each individual filter (see make_win.c) |
309 | daniel-mar | 358 | |
359 | seed = initial_seed; |
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292 | daniel-mar | 360 | seed_position = offsetof(PARM_T, unknown2); // = offsetof(PARM_T_PREMIERE, unknown1) |
361 | |||
309 | daniel-mar | 362 | if (obfusc_version == 5) { |
363 | // make v4 and v5 intentionally incompatible to avoid a downgrade-attack |
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364 | seed ^= 0xFFFFFFFF; |
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365 | } |
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366 | |||
292 | daniel-mar | 367 | p = (unsigned char*)pparm; |
293 | daniel-mar | 368 | xorshift(&p, &seed, seed_position); |
329 | daniel-mar | 369 | *((uint32_t*)p) = 0; // here was the version info. Fill it with 0x00000000 |
370 | p += 4; // obfusc info was 4 or 5 |
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293 | daniel-mar | 371 | xorshift(&p, &seed, size - seed_position - 4); |
292 | daniel-mar | 372 | |
373 | if (obfusc_version == 5) { |
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318 | daniel-mar | 374 | pparm->unknown2 = 0; // make sure crc32b matches always |
347 | daniel-mar | 375 | if (crc32b((char*)pparm, sizeof(PARM_T)) != initial_seed) { |
292 | daniel-mar | 376 | // Integrity check failed! |
309 | daniel-mar | 377 | memset(pparm, 0, sizeof(PARM_T)); // invalidate everything |
292 | daniel-mar | 378 | } |
379 | } |
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380 | |||
381 | break; |
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382 | } |
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347 | daniel-mar | 383 | case 6: { |
384 | // Version 6 obfuscation (Filter Foundry 1.7.0.10) |
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489 | daniel-mar | 385 | // Not compiler dependent, but individual for each standalone filter |
347 | daniel-mar | 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! |
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388 | |||
389 | unsigned char* p; |
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350 | daniel-mar | 390 | uint32_t xorseed, checksum; |
348 | daniel-mar | 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) |
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347 | daniel-mar | 394 | |
348 | daniel-mar | 395 | rolseed = initial_seed; |
347 | daniel-mar | 396 | p = (unsigned char*)pparm; |
348 | daniel-mar | 397 | rolshift(&p, &rolseed, sizeof(PARM_T)); |
347 | daniel-mar | 398 | |
350 | daniel-mar | 399 | xorseed = initial_seed & 0xFFFFFFFF; |
347 | daniel-mar | 400 | p = (unsigned char*)pparm; |
350 | daniel-mar | 401 | xorshift(&p, &xorseed, sizeof(PARM_T)); |
347 | daniel-mar | 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! |
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411 | memset(pparm, 0, sizeof(PARM_T)); // invalidate everything |
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412 | } |
||
413 | |||
414 | break; |
||
415 | } |
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292 | daniel-mar | 416 | default: { |
417 | // Obfuscation version unexpected! |
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309 | daniel-mar | 418 | memset(pparm, 0, sizeof(PARM_T)); // invalidate everything |
311 | daniel-mar | 419 | |
420 | // If "return" is present: Calling function will receive an invalid cbSize value, hence showing "incompatible obfuscation" |
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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; |
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292 | daniel-mar | 423 | } |
424 | } |
||
425 | |||
309 | daniel-mar | 426 | if ((pparm->cbSize != PARM_SIZE) && |
351 | daniel-mar | 427 | (pparm->cbSize != PARM_SIZE_PREMIERE) && |
309 | daniel-mar | 428 | (pparm->cbSize != PARM_SIG_MAC)) { |
429 | memset(pparm, 0, sizeof(PARM_T)); // invalidate everything |
||
430 | } |
||
431 | |||
292 | daniel-mar | 432 | if (obfusc_version >= 3) { |
489 | daniel-mar | 433 | // Filter Foundry >= 1.7.0.5 combines obfuscation and protection |
292 | daniel-mar | 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. |
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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), |
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293 | daniel-mar | 440 | // we still want that load_*.c is able to detect pparm->iProtected instead |
441 | // of throwing the error "Incompatible obfuscation". |
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292 | daniel-mar | 442 | pparm->cbSize = PARM_SIZE; |
408 | daniel-mar | 443 | pparm->standalone = 1; |
292 | daniel-mar | 444 | } |
312 | daniel-mar | 445 | |
446 | if (obfusc_version >= 1) { |
||
447 | // information was lost due to obfuscation. Make sure it is zero. |
||
448 | pparm->unknown2 = 0; |
||
449 | } |
||
351 | daniel-mar | 450 | |
451 | if (obfusc_version >= 6) { |
||
452 | // information was lost due to checksum. Make sure it is zero. |
||
453 | pparm->unknown1 = 0; |
||
454 | } |
||
292 | daniel-mar | 455 | } |