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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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503 | daniel-mar | 4 | Copyright (C) 2018-2022 Daniel Marschall, ViaThinkSoft |
292 | daniel-mar | 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 | |||
506 | daniel-mar | 26 | // Random seed for obfuscation "17 05 83 52 2a 97 16 74" |
27 | // During the standalone-make process, this value will be changed by manipulating the 8BF file. |
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28 | // Therefore, the 32/64 bit 8BF files *MUST* contain the key contiguous and preferrpreferablyibly 4-aligned |
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29 | // Why do I use GetObfuscSeed? |
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30 | // 1. Because I prefer the key in side code segment so that it is better hidden than if it was in a data segment. |
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31 | // 2. Since the code segment is closer to the 8BF file start, the search+replace of the key is faster |
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32 | // Please also note: |
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33 | // The 8BF file *MUST* only contain the seed A SINGLE TIME |
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34 | // (In the Non-Standalone filter actually 3 times, because we have 2 resourced containing the 32/64 template DLLs) |
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35 | #if defined(__WATCOMC__) |
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36 | uint64_t GetObfuscSeed() { |
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37 | // Due to "volatile", this value will only exist a single time in the binary file. |
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38 | // This char array will result in contiguous chars in OpenWatcom. |
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39 | // In MSVC++, the array will be built using several "mov ..." OP codes. |
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40 | volatile char seed[8] = { '\x17', '\x05', '\x83', '\x52', '\x2a', '\x97', '\x16', '\x74' }; |
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528 | daniel-mar | 41 | return *((uint64_t*)&seed[0]); |
42 | |||
506 | daniel-mar | 43 | } |
44 | #elif defined(_MSC_VER) |
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45 | #ifdef _WIN64 |
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46 | // Note: For MSVCC 64-bit, neither making the method volatile, nor including a volatile variable did avoid inlining. |
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47 | // so we use __declspec(noinline) |
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48 | __declspec(noinline) uint64_t GetObfuscSeed() { |
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49 | // TODO: Not 4-byte aligned! (both variants) |
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50 | //volatile uint64_t seed = 0x7416972a52830517ull; |
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51 | //return seed; |
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52 | return 0x7416972a52830517ull; |
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53 | } |
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54 | #else |
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55 | __declspec(noinline) uint64_t GetObfuscSeed() { |
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56 | //volatile int test = 0; |
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57 | uint64_t* addr = NULL; |
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58 | __asm { |
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59 | mov eax, seed // Doesn't work in OpenWatcom |
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60 | mov addr, eax |
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61 | jmp end |
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62 | align 4 // Doesn't work in OpenWatcom |
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63 | seed: |
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64 | _emit 0x17 // Doesn't work in OpenWatcom |
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65 | _emit 0x05 |
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66 | _emit 0x83 |
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67 | _emit 0x52 |
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68 | _emit 0x2A |
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69 | _emit 0x97 |
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70 | _emit 0x16 |
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71 | _emit 0x74 |
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72 | /* |
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73 | pop ss |
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74 | add eax, 0x972a5283 |
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75 | push ss |
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76 | jz seed |
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77 | */ |
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78 | end: |
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79 | } |
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80 | return addr == NULL ? 0 : *addr; |
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81 | } |
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82 | #endif |
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83 | #else |
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526 | daniel-mar | 84 | // Unfortunately, with this compiler, we don't know how to force the seed into the .code segment. |
85 | // So, we put it in the .data segment. |
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86 | // Note: Due to "const volatile", this value will only exist a single time in the binary file. |
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508 | daniel-mar | 87 | const volatile uint64_t obfusc_seed = 0x7416972a52830517ull; |
506 | daniel-mar | 88 | uint64_t GetObfuscSeed() { |
508 | daniel-mar | 89 | return obfusc_seed; |
506 | daniel-mar | 90 | } |
91 | #endif |
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292 | daniel-mar | 92 | |
508 | daniel-mar | 93 | // Random seed #2 for obfuscation "86 21 1f 3e f1 a2 87 ef" |
94 | // Lies in the data segment. Same rules like for the random seed #1. |
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95 | const volatile uint64_t obfusc_seed2 = 0xef87a2f13e1f2186ull; |
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96 | #ifdef _MSC_VER |
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97 | __declspec(noinline) |
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98 | #endif |
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99 | uint64_t GetObfuscSeed2() { |
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100 | // Additional seed for Obfusc V7. It is always in the data segment, |
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101 | // while obfusc seed 1 is in the code segment (if the compiler allows it) |
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102 | return obfusc_seed2; |
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103 | } |
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510 | daniel-mar | 104 | |
105 | #ifdef WIN_ENV |
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106 | Boolean obfusc_seed_replace(FSSpec* dst, uint64_t search1, uint64_t search2, uint64_t replace1, uint64_t replace2, int maxamount1, int maxamount2) { |
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107 | uint64_t srecord = 0; |
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108 | int found1 = 0, found2 = 0; |
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109 | Boolean done = false; |
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110 | FILEREF fptr; |
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111 | FILECOUNT cnt; |
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112 | |||
113 | if (FSpOpenDF(dst, fsRdWrPerm, &fptr) != noErr) return -1; |
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114 | |||
115 | cnt = sizeof(srecord); |
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116 | while (FSRead(fptr, &cnt, &srecord) == noErr) |
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117 | { |
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118 | if (cnt != sizeof(srecord)) break; // EOF reached |
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119 | if (srecord == search1) { |
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120 | srecord = replace1; |
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121 | SetFPos(fptr, fsFromMark, -1 * (long)sizeof(srecord)); |
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122 | cnt = (int)sizeof(srecord); |
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123 | FSWrite(fptr, &cnt, &srecord); |
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124 | SetFPos(fptr, fsFromStart, 0); // important for fseek |
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125 | found1++; |
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126 | done = (found1 == maxamount1) && (found2 == maxamount2); |
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127 | if (done) break; |
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128 | } |
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129 | else if (srecord == search2) { |
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130 | srecord = replace2; |
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131 | SetFPos(fptr, fsFromMark, -1 * (long)sizeof(srecord)); |
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132 | cnt = (int)sizeof(srecord); |
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133 | FSWrite(fptr, &cnt, &srecord); |
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134 | SetFPos(fptr, fsFromStart, 0); // important for fseek |
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135 | found2++; |
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136 | done = (found1 == maxamount1) && (found2 == maxamount2); |
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137 | if (done) break; |
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138 | } |
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139 | else { |
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140 | SetFPos(fptr, fsFromMark, -1 * (long)(sizeof(srecord) - 1)); |
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141 | } |
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142 | } |
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143 | FSClose(fptr); |
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144 | |||
145 | return done; |
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146 | } |
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147 | #endif |
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508 | daniel-mar | 148 | |
292 | daniel-mar | 149 | int rand_msvcc(unsigned int* seed) { |
150 | *seed = *seed * 214013L + 2531011L; |
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151 | return (*seed >> 16) & 0x7fff; /* Scale between 0 and RAND_MAX */ |
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152 | } |
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153 | |||
154 | int rand_openwatcom(unsigned int* seed) { |
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155 | // https://github.com/open-watcom/open-watcom-v2/blob/master/bld/clib/math/c/rand.c |
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156 | *seed = *seed * 1103515245L + 12345L; |
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157 | return (*seed >> 16) & 0x7fff; /* Scale between 0 and RAND_MAX */ |
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158 | } |
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159 | |||
293 | daniel-mar | 160 | void xorshift(unsigned char** p, uint32_t* x32, size_t num) { |
292 | daniel-mar | 161 | size_t i; |
162 | unsigned char* x = *p; |
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163 | for (i = 0; i < num; i++) { |
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164 | // https://de.wikipedia.org/wiki/Xorshift |
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165 | *x32 ^= *x32 << 13; |
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166 | *x32 ^= *x32 >> 17; |
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167 | *x32 ^= *x32 << 5; |
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168 | *x++ ^= *x32; |
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169 | } |
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170 | *p = x; |
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171 | } |
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172 | |||
508 | daniel-mar | 173 | void xorshift64(unsigned char** p, uint64_t* x64, size_t num) { |
174 | // https://de.wikipedia.org/wiki/Xorshift |
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175 | size_t i; |
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176 | unsigned char* x = *p; |
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177 | for (i = 0; i < num; i++) { |
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178 | *x64 ^= *x64 << 13; |
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179 | *x64 ^= *x64 >> 7; |
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180 | *x64 ^= *x64 << 17; |
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181 | *x++ ^= *x64; |
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182 | } |
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183 | *p = x; |
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184 | } |
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185 | |||
348 | daniel-mar | 186 | #ifndef CHAR_BIT |
187 | #define CHAR_BIT 8 |
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188 | #endif |
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189 | |||
190 | uint64_t rol_u64(uint64_t value, uint64_t by) { |
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509 | daniel-mar | 191 | return value << by | value >> ((uint64_t)sizeof(uint64_t) * CHAR_BIT - by); |
348 | daniel-mar | 192 | } |
193 | |||
194 | void rolshift(unsigned char** p, uint64_t* x64, size_t num) { |
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195 | size_t i; |
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196 | unsigned char* x = *p; |
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197 | for (i = 0; i < num; i++) { |
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198 | *x++ ^= *x64; |
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199 | *x64 = rol_u64(*x64, 1); |
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200 | } |
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201 | *p = x; |
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202 | } |
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203 | |||
311 | daniel-mar | 204 | uint32_t crc32b(char *data, int nLength) { |
205 | int i, j, k; |
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318 | daniel-mar | 206 | uint32_t crc, mask; |
207 | char byte; |
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311 | daniel-mar | 208 | |
209 | i = 0; |
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210 | crc = 0xFFFFFFFF; |
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211 | |||
212 | for(k=0;k<nLength;k++) { |
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213 | byte = data[k]; |
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214 | crc = crc ^ byte; |
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215 | for (j = 7; j >= 0; j--) { |
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318 | daniel-mar | 216 | mask = (-1) * (crc & 1); |
311 | daniel-mar | 217 | crc = (crc >> 1) ^ (0xEDB88320 & mask); |
218 | } |
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219 | i++; |
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220 | } |
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221 | return ~crc; |
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222 | } |
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223 | |||
349 | daniel-mar | 224 | static const uint64_t crc64_tab[256] = { |
225 | 0x0000000000000000ULL, 0x42F0E1EBA9EA3693ULL, 0x85E1C3D753D46D26ULL, |
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226 | 0xC711223CFA3E5BB5ULL, 0x493366450E42ECDFULL, 0x0BC387AEA7A8DA4CULL, |
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227 | 0xCCD2A5925D9681F9ULL, 0x8E224479F47CB76AULL, 0x9266CC8A1C85D9BEULL, |
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228 | 0xD0962D61B56FEF2DULL, 0x17870F5D4F51B498ULL, 0x5577EEB6E6BB820BULL, |
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229 | 0xDB55AACF12C73561ULL, 0x99A54B24BB2D03F2ULL, 0x5EB4691841135847ULL, |
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230 | 0x1C4488F3E8F96ED4ULL, 0x663D78FF90E185EFULL, 0x24CD9914390BB37CULL, |
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231 | 0xE3DCBB28C335E8C9ULL, 0xA12C5AC36ADFDE5AULL, 0x2F0E1EBA9EA36930ULL, |
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232 | 0x6DFEFF5137495FA3ULL, 0xAAEFDD6DCD770416ULL, 0xE81F3C86649D3285ULL, |
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233 | 0xF45BB4758C645C51ULL, 0xB6AB559E258E6AC2ULL, 0x71BA77A2DFB03177ULL, |
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234 | 0x334A9649765A07E4ULL, 0xBD68D2308226B08EULL, 0xFF9833DB2BCC861DULL, |
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235 | 0x388911E7D1F2DDA8ULL, 0x7A79F00C7818EB3BULL, 0xCC7AF1FF21C30BDEULL, |
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236 | 0x8E8A101488293D4DULL, 0x499B3228721766F8ULL, 0x0B6BD3C3DBFD506BULL, |
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237 | 0x854997BA2F81E701ULL, 0xC7B97651866BD192ULL, 0x00A8546D7C558A27ULL, |
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238 | 0x4258B586D5BFBCB4ULL, 0x5E1C3D753D46D260ULL, 0x1CECDC9E94ACE4F3ULL, |
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239 | 0xDBFDFEA26E92BF46ULL, 0x990D1F49C77889D5ULL, 0x172F5B3033043EBFULL, |
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240 | 0x55DFBADB9AEE082CULL, 0x92CE98E760D05399ULL, 0xD03E790CC93A650AULL, |
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241 | 0xAA478900B1228E31ULL, 0xE8B768EB18C8B8A2ULL, 0x2FA64AD7E2F6E317ULL, |
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242 | 0x6D56AB3C4B1CD584ULL, 0xE374EF45BF6062EEULL, 0xA1840EAE168A547DULL, |
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243 | 0x66952C92ECB40FC8ULL, 0x2465CD79455E395BULL, 0x3821458AADA7578FULL, |
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244 | 0x7AD1A461044D611CULL, 0xBDC0865DFE733AA9ULL, 0xFF3067B657990C3AULL, |
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245 | 0x711223CFA3E5BB50ULL, 0x33E2C2240A0F8DC3ULL, 0xF4F3E018F031D676ULL, |
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246 | 0xB60301F359DBE0E5ULL, 0xDA050215EA6C212FULL, 0x98F5E3FE438617BCULL, |
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247 | 0x5FE4C1C2B9B84C09ULL, 0x1D14202910527A9AULL, 0x93366450E42ECDF0ULL, |
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248 | 0xD1C685BB4DC4FB63ULL, 0x16D7A787B7FAA0D6ULL, 0x5427466C1E109645ULL, |
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249 | 0x4863CE9FF6E9F891ULL, 0x0A932F745F03CE02ULL, 0xCD820D48A53D95B7ULL, |
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250 | 0x8F72ECA30CD7A324ULL, 0x0150A8DAF8AB144EULL, 0x43A04931514122DDULL, |
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251 | 0x84B16B0DAB7F7968ULL, 0xC6418AE602954FFBULL, 0xBC387AEA7A8DA4C0ULL, |
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252 | 0xFEC89B01D3679253ULL, 0x39D9B93D2959C9E6ULL, 0x7B2958D680B3FF75ULL, |
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253 | 0xF50B1CAF74CF481FULL, 0xB7FBFD44DD257E8CULL, 0x70EADF78271B2539ULL, |
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254 | 0x321A3E938EF113AAULL, 0x2E5EB66066087D7EULL, 0x6CAE578BCFE24BEDULL, |
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255 | 0xABBF75B735DC1058ULL, 0xE94F945C9C3626CBULL, 0x676DD025684A91A1ULL, |
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256 | 0x259D31CEC1A0A732ULL, 0xE28C13F23B9EFC87ULL, 0xA07CF2199274CA14ULL, |
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257 | 0x167FF3EACBAF2AF1ULL, 0x548F120162451C62ULL, 0x939E303D987B47D7ULL, |
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258 | 0xD16ED1D631917144ULL, 0x5F4C95AFC5EDC62EULL, 0x1DBC74446C07F0BDULL, |
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259 | 0xDAAD56789639AB08ULL, 0x985DB7933FD39D9BULL, 0x84193F60D72AF34FULL, |
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260 | 0xC6E9DE8B7EC0C5DCULL, 0x01F8FCB784FE9E69ULL, 0x43081D5C2D14A8FAULL, |
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261 | 0xCD2A5925D9681F90ULL, 0x8FDAB8CE70822903ULL, 0x48CB9AF28ABC72B6ULL, |
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262 | 0x0A3B7B1923564425ULL, 0x70428B155B4EAF1EULL, 0x32B26AFEF2A4998DULL, |
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263 | 0xF5A348C2089AC238ULL, 0xB753A929A170F4ABULL, 0x3971ED50550C43C1ULL, |
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264 | 0x7B810CBBFCE67552ULL, 0xBC902E8706D82EE7ULL, 0xFE60CF6CAF321874ULL, |
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265 | 0xE224479F47CB76A0ULL, 0xA0D4A674EE214033ULL, 0x67C58448141F1B86ULL, |
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266 | 0x253565A3BDF52D15ULL, 0xAB1721DA49899A7FULL, 0xE9E7C031E063ACECULL, |
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267 | 0x2EF6E20D1A5DF759ULL, 0x6C0603E6B3B7C1CAULL, 0xF6FAE5C07D3274CDULL, |
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268 | 0xB40A042BD4D8425EULL, 0x731B26172EE619EBULL, 0x31EBC7FC870C2F78ULL, |
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269 | 0xBFC9838573709812ULL, 0xFD39626EDA9AAE81ULL, 0x3A28405220A4F534ULL, |
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270 | 0x78D8A1B9894EC3A7ULL, 0x649C294A61B7AD73ULL, 0x266CC8A1C85D9BE0ULL, |
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271 | 0xE17DEA9D3263C055ULL, 0xA38D0B769B89F6C6ULL, 0x2DAF4F0F6FF541ACULL, |
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272 | 0x6F5FAEE4C61F773FULL, 0xA84E8CD83C212C8AULL, 0xEABE6D3395CB1A19ULL, |
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273 | 0x90C79D3FEDD3F122ULL, 0xD2377CD44439C7B1ULL, 0x15265EE8BE079C04ULL, |
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274 | 0x57D6BF0317EDAA97ULL, 0xD9F4FB7AE3911DFDULL, 0x9B041A914A7B2B6EULL, |
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275 | 0x5C1538ADB04570DBULL, 0x1EE5D94619AF4648ULL, 0x02A151B5F156289CULL, |
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276 | 0x4051B05E58BC1E0FULL, 0x87409262A28245BAULL, 0xC5B073890B687329ULL, |
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277 | 0x4B9237F0FF14C443ULL, 0x0962D61B56FEF2D0ULL, 0xCE73F427ACC0A965ULL, |
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278 | 0x8C8315CC052A9FF6ULL, 0x3A80143F5CF17F13ULL, 0x7870F5D4F51B4980ULL, |
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279 | 0xBF61D7E80F251235ULL, 0xFD913603A6CF24A6ULL, 0x73B3727A52B393CCULL, |
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280 | 0x31439391FB59A55FULL, 0xF652B1AD0167FEEAULL, 0xB4A25046A88DC879ULL, |
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281 | 0xA8E6D8B54074A6ADULL, 0xEA16395EE99E903EULL, 0x2D071B6213A0CB8BULL, |
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282 | 0x6FF7FA89BA4AFD18ULL, 0xE1D5BEF04E364A72ULL, 0xA3255F1BE7DC7CE1ULL, |
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283 | 0x64347D271DE22754ULL, 0x26C49CCCB40811C7ULL, 0x5CBD6CC0CC10FAFCULL, |
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284 | 0x1E4D8D2B65FACC6FULL, 0xD95CAF179FC497DAULL, 0x9BAC4EFC362EA149ULL, |
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285 | 0x158E0A85C2521623ULL, 0x577EEB6E6BB820B0ULL, 0x906FC95291867B05ULL, |
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286 | 0xD29F28B9386C4D96ULL, 0xCEDBA04AD0952342ULL, 0x8C2B41A1797F15D1ULL, |
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287 | 0x4B3A639D83414E64ULL, 0x09CA82762AAB78F7ULL, 0x87E8C60FDED7CF9DULL, |
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288 | 0xC51827E4773DF90EULL, 0x020905D88D03A2BBULL, 0x40F9E43324E99428ULL, |
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289 | 0x2CFFE7D5975E55E2ULL, 0x6E0F063E3EB46371ULL, 0xA91E2402C48A38C4ULL, |
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290 | 0xEBEEC5E96D600E57ULL, 0x65CC8190991CB93DULL, 0x273C607B30F68FAEULL, |
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291 | 0xE02D4247CAC8D41BULL, 0xA2DDA3AC6322E288ULL, 0xBE992B5F8BDB8C5CULL, |
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292 | 0xFC69CAB42231BACFULL, 0x3B78E888D80FE17AULL, 0x7988096371E5D7E9ULL, |
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293 | 0xF7AA4D1A85996083ULL, 0xB55AACF12C735610ULL, 0x724B8ECDD64D0DA5ULL, |
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294 | 0x30BB6F267FA73B36ULL, 0x4AC29F2A07BFD00DULL, 0x08327EC1AE55E69EULL, |
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295 | 0xCF235CFD546BBD2BULL, 0x8DD3BD16FD818BB8ULL, 0x03F1F96F09FD3CD2ULL, |
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296 | 0x41011884A0170A41ULL, 0x86103AB85A2951F4ULL, 0xC4E0DB53F3C36767ULL, |
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297 | 0xD8A453A01B3A09B3ULL, 0x9A54B24BB2D03F20ULL, 0x5D45907748EE6495ULL, |
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298 | 0x1FB5719CE1045206ULL, 0x919735E51578E56CULL, 0xD367D40EBC92D3FFULL, |
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299 | 0x1476F63246AC884AULL, 0x568617D9EF46BED9ULL, 0xE085162AB69D5E3CULL, |
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300 | 0xA275F7C11F7768AFULL, 0x6564D5FDE549331AULL, 0x279434164CA30589ULL, |
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301 | 0xA9B6706FB8DFB2E3ULL, 0xEB46918411358470ULL, 0x2C57B3B8EB0BDFC5ULL, |
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302 | 0x6EA7525342E1E956ULL, 0x72E3DAA0AA188782ULL, 0x30133B4B03F2B111ULL, |
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303 | 0xF7021977F9CCEAA4ULL, 0xB5F2F89C5026DC37ULL, 0x3BD0BCE5A45A6B5DULL, |
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304 | 0x79205D0E0DB05DCEULL, 0xBE317F32F78E067BULL, 0xFCC19ED95E6430E8ULL, |
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305 | 0x86B86ED5267CDBD3ULL, 0xC4488F3E8F96ED40ULL, 0x0359AD0275A8B6F5ULL, |
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306 | 0x41A94CE9DC428066ULL, 0xCF8B0890283E370CULL, 0x8D7BE97B81D4019FULL, |
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307 | 0x4A6ACB477BEA5A2AULL, 0x089A2AACD2006CB9ULL, 0x14DEA25F3AF9026DULL, |
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308 | 0x562E43B4931334FEULL, 0x913F6188692D6F4BULL, 0xD3CF8063C0C759D8ULL, |
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309 | 0x5DEDC41A34BBEEB2ULL, 0x1F1D25F19D51D821ULL, 0xD80C07CD676F8394ULL, |
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310 | 0x9AFCE626CE85B507ULL |
||
311 | }; |
||
312 | |||
313 | /* |
||
314 | * ECMA 182 CRC64, taken from https://searchcode.com/file/68313281/lib/crc64.c/ |
||
315 | */ |
||
316 | uint64_t crc64(const unsigned char* data, size_t len) |
||
317 | { |
||
318 | uint64_t crc = 0; |
||
319 | |||
320 | while (len--) { |
||
321 | int i = ((int)(crc >> 56) ^ *data++) & 0xFF; |
||
322 | crc = crc64_tab[i] ^ (crc << 8); |
||
323 | } |
||
324 | |||
325 | return crc; |
||
326 | } |
||
327 | |||
352 | daniel-mar | 328 | |
329 | int obfuscation_version(PARM_T* pparm) { |
||
330 | uint32_t obfusc_info = pparm->unknown2; |
||
331 | |||
507 | daniel-mar | 332 | if (obfusc_info == 0x00000001) { // 01 00 00 00 |
333 | // Photoshop FilterFactory default initialization of field "unknown2" (no obfuscation) |
||
352 | daniel-mar | 334 | return 0; |
335 | } |
||
507 | daniel-mar | 336 | else if (obfusc_info == 0x00000000) { // 00 00 00 00 |
337 | // Premiere FilterFactory default initialization of field "unknown1" (no obfuscation) |
||
338 | // (Premiere Field "unknown1" has the offset of Photoshop's "unknown2" field) |
||
352 | daniel-mar | 339 | return 0; |
340 | } |
||
341 | else if (obfusc_info == 0x90E364A3) { // A3 64 E3 90 |
||
342 | // Version 1 obfuscation (Filter Foundry 1.4b8,9,10) |
||
343 | return 1; |
||
344 | } |
||
345 | else if (obfusc_info == 0xE2CFCA34) { // 34 CA CF E2 |
||
346 | // Version 2 obfuscation (Filter Foundry 1.7b1) |
||
347 | return 2; |
||
348 | } |
||
349 | else if ((obfusc_info >= 4) && (obfusc_info <= 0xFF)) { // xx 00 00 00 |
||
350 | // Version 4 obfuscation (Filter Foundry 1.7.0.7) |
||
351 | // Version 5 obfuscation (Filter Foundry 1.7.0.8) |
||
352 | // Version 6 obfuscation (Filter Foundry 1.7.0.10) |
||
508 | daniel-mar | 353 | // Version 7 obfuscation (Filter Foundry 1.7.0.17) |
526 | daniel-mar | 354 | // Future: Version 8, 9, ..., 255 |
352 | daniel-mar | 355 | return obfusc_info; |
356 | } |
||
357 | else { |
||
358 | // Version 3 obfuscation (Filter Foundry 1.7.0.5) |
||
359 | // obfusc_info is the srand() seed and is equal to the time(0) build timestamp |
||
360 | return 3; |
||
361 | } |
||
362 | } |
||
363 | |||
508 | daniel-mar | 364 | void obfusc(PARM_T* pparm, uint64_t* out_initial_seed, uint64_t* out_initial_seed2) { |
365 | // Version 7 obfuscation (Introduced in Filter Foundry 1.7.0.17) |
||
292 | daniel-mar | 366 | |
367 | unsigned char* p; |
||
508 | daniel-mar | 368 | uint64_t initial_seed, initial_seed2, rolseed; |
350 | daniel-mar | 369 | uint32_t xorseed; |
508 | daniel-mar | 370 | uint64_t xorseed2; |
510 | daniel-mar | 371 | size_t size = sizeof(PARM_T); |
372 | int rand_iters, i, j; |
||
347 | daniel-mar | 373 | |
292 | daniel-mar | 374 | #ifdef MAC_ENV |
347 | daniel-mar | 375 | // Currently, make_mac.c does not implement modifying the executable code (TODO), |
376 | // so we will use the default initial_seed! |
||
506 | daniel-mar | 377 | initial_seed = GetObfuscSeed(); |
508 | daniel-mar | 378 | initial_seed2 = GetObfuscSeed2(); |
292 | daniel-mar | 379 | #else |
347 | daniel-mar | 380 | // Give always the same seed if the parameters are the same. No random values. |
381 | // This initial seed will be returned and built into the executable code by make_win.c |
||
508 | daniel-mar | 382 | pparm->unknown1 = 0; |
383 | pparm->unknown2 = 0; |
||
384 | pparm->unknown3 = 0; |
||
350 | daniel-mar | 385 | initial_seed = crc64((unsigned char*)pparm, sizeof(PARM_T)); |
508 | daniel-mar | 386 | pparm->unknown3 = crc32b((char*)pparm, sizeof(PARM_T)); // make sure that the second seed is different |
387 | pparm->unknown2 = crc32b((char*)pparm, sizeof(PARM_T)); // make sure that the second seed is different |
||
388 | pparm->unknown1 = crc32b((char*)pparm, sizeof(PARM_T)); // make sure that the second seed is different |
||
389 | initial_seed2 = crc64((unsigned char*)pparm, sizeof(PARM_T)); |
||
292 | daniel-mar | 390 | #endif |
391 | |||
508 | daniel-mar | 392 | // AFTER unknown1-3 have been set to 0 (again), calculate the checksum! |
393 | pparm->unknown1 = 0; |
||
394 | pparm->unknown2 = 0; |
||
395 | pparm->unknown3 = 0; |
||
347 | daniel-mar | 396 | pparm->unknown1 = crc32b((char*)pparm, sizeof(PARM_T)); |
309 | daniel-mar | 397 | |
350 | daniel-mar | 398 | xorseed = initial_seed & 0xFFFFFFFF; |
292 | daniel-mar | 399 | p = (unsigned char*)pparm; |
350 | daniel-mar | 400 | xorshift(&p, &xorseed, sizeof(PARM_T)); |
292 | daniel-mar | 401 | |
348 | daniel-mar | 402 | rolseed = initial_seed; |
347 | daniel-mar | 403 | p = (unsigned char*)pparm; |
348 | daniel-mar | 404 | rolshift(&p, &rolseed, sizeof(PARM_T)); |
347 | daniel-mar | 405 | |
510 | daniel-mar | 406 | rand_iters = 0xFFF - (initial_seed & 0xFF) + (initial_seed2 & 0xFF); |
407 | if (rand_iters < 0) rand_iters = 0; |
||
408 | for (j = rand_iters; j >= 0; j--) { |
||
409 | uint32_t rand_seed = (initial_seed + initial_seed2 + j) & 0xFFFFFFFF; |
||
410 | p = (unsigned char*)pparm; |
||
411 | for (i = 0; i < 10; i++) { |
||
412 | rand_msvcc(&rand_seed); |
||
413 | } |
||
414 | for (i = 0; i < (int)size; i++) { |
||
415 | *p++ ^= (int)(rand_msvcc(&rand_seed) * 1.0 / ((double)RAND_MAX + 1) * 256); |
||
416 | } |
||
417 | } |
||
418 | |||
508 | daniel-mar | 419 | xorseed2 = initial_seed2; |
420 | p = (unsigned char*)pparm; |
||
421 | xorshift64(&p, &xorseed2, sizeof(PARM_T)); |
||
347 | daniel-mar | 422 | |
508 | daniel-mar | 423 | pparm->unknown2 = 7; // obfusc version |
424 | |||
425 | *out_initial_seed = initial_seed; |
||
426 | *out_initial_seed2 = initial_seed2; |
||
292 | daniel-mar | 427 | } |
428 | |||
429 | void deobfusc(PARM_T* pparm) { |
||
309 | daniel-mar | 430 | uint32_t obfusc_version; |
292 | daniel-mar | 431 | size_t size = sizeof(PARM_T); |
432 | |||
293 | daniel-mar | 433 | obfusc_version = obfuscation_version(pparm); |
292 | daniel-mar | 434 | |
435 | switch (obfusc_version) { |
||
436 | case 0: |
||
437 | // no obfuscation |
||
438 | return; |
||
439 | case 1: { |
||
440 | // Version 1 obfuscation (Filter Foundry 1.4b8,9,10) |
||
441 | // Filter built with VC++ (official release by Toby Thain) |
||
442 | |||
443 | unsigned char* p; |
||
444 | size_t i; |
||
309 | daniel-mar | 445 | uint32_t seed; |
292 | daniel-mar | 446 | |
447 | seed = 0xdc43df3c; |
||
448 | |||
449 | for (i = size, p = (unsigned char*)pparm; i--;) { |
||
450 | *p++ ^= rand_msvcc(&seed); |
||
451 | } |
||
452 | break; |
||
453 | } |
||
454 | case 2: { |
||
455 | // Version 2 obfuscation (Filter Foundry 1.7b1) |
||
456 | // Compiler independent |
||
457 | |||
458 | unsigned char* p; |
||
459 | size_t i; |
||
309 | daniel-mar | 460 | uint32_t seed; |
292 | daniel-mar | 461 | |
462 | seed = 0x95d4a68f; |
||
463 | |||
464 | for (i = size, p = (unsigned char*)pparm; i--;) { |
||
465 | seed ^= seed << 13; |
||
466 | seed ^= seed >> 17; |
||
467 | seed ^= seed << 5; |
||
468 | *p++ ^= seed; |
||
469 | } |
||
470 | break; |
||
471 | } |
||
472 | case 3: { |
||
473 | // Version 3 obfuscation (Filter Foundry 1.7.0.5) |
||
474 | // NO loading of other implementation supported, but that doesn't matter since |
||
475 | // obfuscation and protection is combined in Filter Factory >= 1.7.0.5. |
||
476 | // Using rand() is more secure, because it differs from compiler to compiler, so |
||
477 | // it is harder to read a protected 8BF plugin. |
||
478 | // Note that rand() in combination with srand() is deterministic, so it is safe |
||
479 | // to use it: https://stackoverflow.com/questions/55438293/does-rand-function-in-c-follows-non-determinstc-algorithm |
||
480 | // Note: 32-Bit FF is built using OpenWatcom (to support Win95), while 64-Bit FF is built using Microsoft Visual C++ |
||
481 | |||
482 | unsigned char* p; |
||
483 | size_t i; |
||
309 | daniel-mar | 484 | uint32_t seed; |
292 | daniel-mar | 485 | size_t seed_position; |
486 | |||
487 | seed = pparm->unknown2; |
||
488 | seed_position = offsetof(PARM_T, unknown2); // = offsetof(PARM_T_PREMIERE, unknown1) |
||
489 | |||
490 | srand(seed); |
||
329 | daniel-mar | 491 | |
292 | daniel-mar | 492 | p = (unsigned char*)pparm; |
351 | daniel-mar | 493 | for (i = 0; i < seed_position; i++) { |
494 | *p++ ^= (int)(rand() * 1.0 / ((double)RAND_MAX + 1) * 256); |
||
495 | } |
||
309 | daniel-mar | 496 | *((uint32_t*)p) = 0; // here was the seed. Fill it with 0x00000000 |
507 | daniel-mar | 497 | p += 4; // jump to the next DWORD |
351 | daniel-mar | 498 | for (i = 0; i < size - seed_position - 4; i++) { |
499 | *p++ ^= (int)(rand() * 1.0 / ((double)RAND_MAX + 1) * 256); |
||
500 | } |
||
329 | daniel-mar | 501 | |
292 | daniel-mar | 502 | break; |
503 | } |
||
504 | case 4: |
||
505 | case 5: { |
||
506 | // Version 4 obfuscation (Filter Foundry 1.7.0.7) |
||
507 | // Version 5 obfuscation (Filter Foundry 1.7.0.8) |
||
489 | daniel-mar | 508 | // Not compiler dependent, but individual for each standalone filter |
292 | daniel-mar | 509 | // It is important that this code works for both x86 and x64 indepdently from the used compiler, |
510 | // otherwise, the cross-make x86/x64 won't work! |
||
511 | // Version 5 contains a seed requirement (checksum). |
||
512 | |||
513 | unsigned char* p; |
||
514 | size_t seed_position; |
||
309 | daniel-mar | 515 | uint32_t seed, initial_seed; |
292 | daniel-mar | 516 | |
506 | daniel-mar | 517 | initial_seed = GetObfuscSeed() & 0xFFFFFFFF; // this value will be manipulated during the building of each individual filter (see make_win.c) |
309 | daniel-mar | 518 | |
519 | seed = initial_seed; |
||
292 | daniel-mar | 520 | seed_position = offsetof(PARM_T, unknown2); // = offsetof(PARM_T_PREMIERE, unknown1) |
521 | |||
309 | daniel-mar | 522 | if (obfusc_version == 5) { |
523 | // make v4 and v5 intentionally incompatible to avoid a downgrade-attack |
||
524 | seed ^= 0xFFFFFFFF; |
||
525 | } |
||
526 | |||
292 | daniel-mar | 527 | p = (unsigned char*)pparm; |
293 | daniel-mar | 528 | xorshift(&p, &seed, seed_position); |
507 | daniel-mar | 529 | *((uint32_t*)p) = 0; // here was the version info (4 or 5). Fill it with 0x00000000 |
530 | p += 4; // jump to the next DWORD |
||
293 | daniel-mar | 531 | xorshift(&p, &seed, size - seed_position - 4); |
292 | daniel-mar | 532 | |
533 | if (obfusc_version == 5) { |
||
318 | daniel-mar | 534 | pparm->unknown2 = 0; // make sure crc32b matches always |
347 | daniel-mar | 535 | if (crc32b((char*)pparm, sizeof(PARM_T)) != initial_seed) { |
292 | daniel-mar | 536 | // Integrity check failed! |
309 | daniel-mar | 537 | memset(pparm, 0, sizeof(PARM_T)); // invalidate everything |
292 | daniel-mar | 538 | } |
539 | } |
||
540 | |||
541 | break; |
||
542 | } |
||
509 | daniel-mar | 543 | case 6: |
544 | case 7: { |
||
347 | daniel-mar | 545 | // Version 6 obfuscation (Filter Foundry 1.7.0.10) |
509 | daniel-mar | 546 | // Version 7 obfuscation (Filter Foundry 1.7.0.17) |
489 | daniel-mar | 547 | // Not compiler dependent, but individual for each standalone filter |
347 | daniel-mar | 548 | // It is important that this code works for both x86 and x64 indepdently from the used compiler, |
549 | // otherwise, the cross-make x86/x64 won't work! |
||
550 | |||
551 | unsigned char* p; |
||
350 | daniel-mar | 552 | uint32_t xorseed, checksum; |
348 | daniel-mar | 553 | uint64_t initial_seed, rolseed; |
503 | daniel-mar | 554 | |
506 | daniel-mar | 555 | initial_seed = GetObfuscSeed(); // this value will be manipulated during the building of each individual filter (see make_win.c) |
347 | daniel-mar | 556 | |
509 | daniel-mar | 557 | if (obfusc_version >= 7) { |
558 | uint64_t xorseed2, initial_seed2; |
||
510 | daniel-mar | 559 | int rand_iters, i, j; |
560 | |||
509 | daniel-mar | 561 | initial_seed2 = GetObfuscSeed2(); // this value will be manipulated during the building of each individual filter (see make_win.c) |
562 | xorseed2 = initial_seed2; |
||
563 | p = (unsigned char*)pparm; |
||
564 | xorshift64(&p, &xorseed2, sizeof(PARM_T)); |
||
510 | daniel-mar | 565 | |
566 | rand_iters = 0xFFF - (initial_seed & 0xFF) + (initial_seed2 & 0xFF); |
||
567 | if (rand_iters < 0) rand_iters = 0; |
||
568 | for (j = 0; j <= rand_iters; j++) { |
||
569 | uint32_t rand_seed = (initial_seed + initial_seed2 + j) & 0xFFFFFFFF; |
||
570 | p = (unsigned char*)pparm; |
||
571 | for (i = 0; i < 10; i++) { |
||
572 | rand_msvcc(&rand_seed); |
||
573 | } |
||
574 | for (i = 0; i < (int)size; i++) { |
||
575 | *p++ ^= (int)(rand_msvcc(&rand_seed) * 1.0 / ((double)RAND_MAX + 1) * 256); |
||
576 | } |
||
577 | } |
||
347 | daniel-mar | 578 | } |
579 | |||
508 | daniel-mar | 580 | rolseed = initial_seed; |
581 | p = (unsigned char*)pparm; |
||
582 | rolshift(&p, &rolseed, sizeof(PARM_T)); |
||
583 | |||
584 | xorseed = initial_seed & 0xFFFFFFFF; |
||
585 | p = (unsigned char*)pparm; |
||
586 | xorshift(&p, &xorseed, sizeof(PARM_T)); |
||
587 | |||
588 | checksum = pparm->unknown1; |
||
589 | |||
590 | pparm->unknown1 = 0; |
||
591 | pparm->unknown2 = 0; |
||
592 | pparm->unknown3 = 0; |
||
593 | |||
594 | if (checksum != crc32b((char*)pparm, sizeof(PARM_T))) { |
||
595 | // Integrity check failed! |
||
596 | memset(pparm, 0, sizeof(PARM_T)); // invalidate everything |
||
597 | } |
||
598 | |||
599 | break; |
||
600 | } |
||
292 | daniel-mar | 601 | default: { |
602 | // Obfuscation version unexpected! |
||
309 | daniel-mar | 603 | memset(pparm, 0, sizeof(PARM_T)); // invalidate everything |
311 | daniel-mar | 604 | |
605 | // If "return" is present: Calling function will receive an invalid cbSize value, hence showing "incompatible obfuscation" |
||
606 | // 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" |
||
607 | return; |
||
292 | daniel-mar | 608 | } |
609 | } |
||
610 | |||
309 | daniel-mar | 611 | if ((pparm->cbSize != PARM_SIZE) && |
351 | daniel-mar | 612 | (pparm->cbSize != PARM_SIZE_PREMIERE) && |
309 | daniel-mar | 613 | (pparm->cbSize != PARM_SIG_MAC)) { |
614 | memset(pparm, 0, sizeof(PARM_T)); // invalidate everything |
||
615 | } |
||
503 | daniel-mar | 616 | |
292 | daniel-mar | 617 | if (obfusc_version >= 3) { |
489 | daniel-mar | 618 | // Filter Foundry >= 1.7.0.5 combines obfuscation and protection |
292 | daniel-mar | 619 | // when a standalone filter is built. Theoretically, you can un-protect a |
620 | // plugin, even if it is obfuscated, just by bit-flipping the LSB of byte 0x164. |
||
621 | // Therefore, we enforce that the plugin is protected! |
||
622 | pparm->iProtected = 1; |
||
623 | |||
624 | // Furthermore, if obfuscation 3+ failed (since the seed is individual for each 8BF file), |
||
293 | daniel-mar | 625 | // we still want that load_*.c is able to detect pparm->iProtected instead |
626 | // of throwing the error "Incompatible obfuscation". |
||
292 | daniel-mar | 627 | pparm->cbSize = PARM_SIZE; |
408 | daniel-mar | 628 | pparm->standalone = 1; |
292 | daniel-mar | 629 | } |
312 | daniel-mar | 630 | |
631 | if (obfusc_version >= 1) { |
||
632 | // information was lost due to obfuscation. Make sure it is zero. |
||
633 | pparm->unknown2 = 0; |
||
634 | } |
||
351 | daniel-mar | 635 | |
636 | if (obfusc_version >= 6) { |
||
637 | // information was lost due to checksum. Make sure it is zero. |
||
638 | pparm->unknown1 = 0; |
||
639 | } |
||
292 | daniel-mar | 640 | } |