Rev 349 | Rev 351 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed
Rev | Author | Line No. | Line |
---|---|---|---|
292 | daniel-mar | 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) 2018-2021 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 | |||
312 | daniel-mar | 26 | // this value will be manipulated during the building of each individual filter (see make_win.c) |
348 | daniel-mar | 27 | const volatile uint64_t cObfuscSeed = 0x38AD972A52830517ull; |
292 | daniel-mar | 28 | |
29 | int rand_msvcc(unsigned int* seed) { |
||
30 | *seed = *seed * 214013L + 2531011L; |
||
31 | return (*seed >> 16) & 0x7fff; /* Scale between 0 and RAND_MAX */ |
||
32 | } |
||
33 | |||
34 | int rand_openwatcom(unsigned int* seed) { |
||
35 | // https://github.com/open-watcom/open-watcom-v2/blob/master/bld/clib/math/c/rand.c |
||
36 | *seed = *seed * 1103515245L + 12345L; |
||
37 | return (*seed >> 16) & 0x7fff; /* Scale between 0 and RAND_MAX */ |
||
38 | } |
||
39 | |||
293 | daniel-mar | 40 | void xorshift(unsigned char** p, uint32_t* x32, size_t num) { |
292 | daniel-mar | 41 | size_t i; |
42 | unsigned char* x = *p; |
||
43 | for (i = 0; i < num; i++) { |
||
44 | // https://de.wikipedia.org/wiki/Xorshift |
||
45 | *x32 ^= *x32 << 13; |
||
46 | *x32 ^= *x32 >> 17; |
||
47 | *x32 ^= *x32 << 5; |
||
48 | *x++ ^= *x32; |
||
49 | } |
||
50 | *p = x; |
||
51 | } |
||
52 | |||
348 | daniel-mar | 53 | #ifndef CHAR_BIT |
54 | #define CHAR_BIT 8 |
||
55 | #endif |
||
56 | |||
57 | uint64_t rol_u64(uint64_t value, uint64_t by) { |
||
58 | return value << by | value >> (sizeof(uint64_t) * CHAR_BIT - by); |
||
59 | } |
||
60 | |||
61 | void rolshift(unsigned char** p, uint64_t* x64, size_t num) { |
||
62 | size_t i; |
||
63 | unsigned char* x = *p; |
||
64 | for (i = 0; i < num; i++) { |
||
65 | *x++ ^= *x64; |
||
66 | *x64 = rol_u64(*x64, 1); |
||
67 | } |
||
68 | *p = x; |
||
69 | } |
||
70 | |||
293 | daniel-mar | 71 | int obfuscation_version(PARM_T* pparm) { |
309 | daniel-mar | 72 | uint32_t obfusc_info = pparm->unknown2; |
292 | daniel-mar | 73 | |
74 | if (obfusc_info == 0x00000000) { // 00 00 00 00 |
||
75 | // Photoshop FilterFactory default initialization |
||
76 | // (no obfuscation) |
||
77 | return 0; |
||
78 | } |
||
79 | else if (obfusc_info == 0x00000001) { // 01 00 00 00 |
||
80 | // Premiere FilterFactory default initialization |
||
81 | // (no obfuscation) |
||
82 | return 0; |
||
83 | } |
||
84 | else if (obfusc_info == 0x90E364A3) { // A3 64 E3 90 |
||
85 | // Version 1 obfuscation (Filter Foundry 1.4b8,9,10) |
||
86 | return 1; |
||
87 | } |
||
88 | else if (obfusc_info == 0xE2CFCA34) { // 34 CA CF E2 |
||
89 | // Version 2 obfuscation (Filter Foundry 1.7b1) |
||
90 | return 2; |
||
91 | } |
||
293 | daniel-mar | 92 | else if ((obfusc_info >= 4) && (obfusc_info <= 0xFF)) { // xx 00 00 00 |
292 | daniel-mar | 93 | // Version 4 obfuscation (Filter Foundry 1.7.0.7) |
94 | // Version 5 obfuscation (Filter Foundry 1.7.0.8) |
||
293 | daniel-mar | 95 | // Future: Version 6, 7, 8, ... 255 |
292 | daniel-mar | 96 | return obfusc_info; |
97 | } |
||
98 | else { |
||
99 | // Version 3 obfuscation (Filter Foundry 1.7.0.5) |
||
100 | // obfusc_info is the srand() seed and is equal to the time(0) build timestamp |
||
101 | return 3; |
||
102 | } |
||
103 | } |
||
104 | |||
311 | daniel-mar | 105 | uint32_t crc32b(char *data, int nLength) { |
106 | int i, j, k; |
||
318 | daniel-mar | 107 | uint32_t crc, mask; |
108 | char byte; |
||
311 | daniel-mar | 109 | |
110 | i = 0; |
||
111 | crc = 0xFFFFFFFF; |
||
112 | |||
113 | for(k=0;k<nLength;k++) { |
||
114 | byte = data[k]; |
||
115 | crc = crc ^ byte; |
||
116 | for (j = 7; j >= 0; j--) { |
||
318 | daniel-mar | 117 | mask = (-1) * (crc & 1); |
311 | daniel-mar | 118 | crc = (crc >> 1) ^ (0xEDB88320 & mask); |
119 | } |
||
120 | i++; |
||
121 | } |
||
122 | return ~crc; |
||
123 | } |
||
124 | |||
349 | daniel-mar | 125 | static const uint64_t crc64_tab[256] = { |
126 | 0x0000000000000000ULL, 0x42F0E1EBA9EA3693ULL, 0x85E1C3D753D46D26ULL, |
||
127 | 0xC711223CFA3E5BB5ULL, 0x493366450E42ECDFULL, 0x0BC387AEA7A8DA4CULL, |
||
128 | 0xCCD2A5925D9681F9ULL, 0x8E224479F47CB76AULL, 0x9266CC8A1C85D9BEULL, |
||
129 | 0xD0962D61B56FEF2DULL, 0x17870F5D4F51B498ULL, 0x5577EEB6E6BB820BULL, |
||
130 | 0xDB55AACF12C73561ULL, 0x99A54B24BB2D03F2ULL, 0x5EB4691841135847ULL, |
||
131 | 0x1C4488F3E8F96ED4ULL, 0x663D78FF90E185EFULL, 0x24CD9914390BB37CULL, |
||
132 | 0xE3DCBB28C335E8C9ULL, 0xA12C5AC36ADFDE5AULL, 0x2F0E1EBA9EA36930ULL, |
||
133 | 0x6DFEFF5137495FA3ULL, 0xAAEFDD6DCD770416ULL, 0xE81F3C86649D3285ULL, |
||
134 | 0xF45BB4758C645C51ULL, 0xB6AB559E258E6AC2ULL, 0x71BA77A2DFB03177ULL, |
||
135 | 0x334A9649765A07E4ULL, 0xBD68D2308226B08EULL, 0xFF9833DB2BCC861DULL, |
||
136 | 0x388911E7D1F2DDA8ULL, 0x7A79F00C7818EB3BULL, 0xCC7AF1FF21C30BDEULL, |
||
137 | 0x8E8A101488293D4DULL, 0x499B3228721766F8ULL, 0x0B6BD3C3DBFD506BULL, |
||
138 | 0x854997BA2F81E701ULL, 0xC7B97651866BD192ULL, 0x00A8546D7C558A27ULL, |
||
139 | 0x4258B586D5BFBCB4ULL, 0x5E1C3D753D46D260ULL, 0x1CECDC9E94ACE4F3ULL, |
||
140 | 0xDBFDFEA26E92BF46ULL, 0x990D1F49C77889D5ULL, 0x172F5B3033043EBFULL, |
||
141 | 0x55DFBADB9AEE082CULL, 0x92CE98E760D05399ULL, 0xD03E790CC93A650AULL, |
||
142 | 0xAA478900B1228E31ULL, 0xE8B768EB18C8B8A2ULL, 0x2FA64AD7E2F6E317ULL, |
||
143 | 0x6D56AB3C4B1CD584ULL, 0xE374EF45BF6062EEULL, 0xA1840EAE168A547DULL, |
||
144 | 0x66952C92ECB40FC8ULL, 0x2465CD79455E395BULL, 0x3821458AADA7578FULL, |
||
145 | 0x7AD1A461044D611CULL, 0xBDC0865DFE733AA9ULL, 0xFF3067B657990C3AULL, |
||
146 | 0x711223CFA3E5BB50ULL, 0x33E2C2240A0F8DC3ULL, 0xF4F3E018F031D676ULL, |
||
147 | 0xB60301F359DBE0E5ULL, 0xDA050215EA6C212FULL, 0x98F5E3FE438617BCULL, |
||
148 | 0x5FE4C1C2B9B84C09ULL, 0x1D14202910527A9AULL, 0x93366450E42ECDF0ULL, |
||
149 | 0xD1C685BB4DC4FB63ULL, 0x16D7A787B7FAA0D6ULL, 0x5427466C1E109645ULL, |
||
150 | 0x4863CE9FF6E9F891ULL, 0x0A932F745F03CE02ULL, 0xCD820D48A53D95B7ULL, |
||
151 | 0x8F72ECA30CD7A324ULL, 0x0150A8DAF8AB144EULL, 0x43A04931514122DDULL, |
||
152 | 0x84B16B0DAB7F7968ULL, 0xC6418AE602954FFBULL, 0xBC387AEA7A8DA4C0ULL, |
||
153 | 0xFEC89B01D3679253ULL, 0x39D9B93D2959C9E6ULL, 0x7B2958D680B3FF75ULL, |
||
154 | 0xF50B1CAF74CF481FULL, 0xB7FBFD44DD257E8CULL, 0x70EADF78271B2539ULL, |
||
155 | 0x321A3E938EF113AAULL, 0x2E5EB66066087D7EULL, 0x6CAE578BCFE24BEDULL, |
||
156 | 0xABBF75B735DC1058ULL, 0xE94F945C9C3626CBULL, 0x676DD025684A91A1ULL, |
||
157 | 0x259D31CEC1A0A732ULL, 0xE28C13F23B9EFC87ULL, 0xA07CF2199274CA14ULL, |
||
158 | 0x167FF3EACBAF2AF1ULL, 0x548F120162451C62ULL, 0x939E303D987B47D7ULL, |
||
159 | 0xD16ED1D631917144ULL, 0x5F4C95AFC5EDC62EULL, 0x1DBC74446C07F0BDULL, |
||
160 | 0xDAAD56789639AB08ULL, 0x985DB7933FD39D9BULL, 0x84193F60D72AF34FULL, |
||
161 | 0xC6E9DE8B7EC0C5DCULL, 0x01F8FCB784FE9E69ULL, 0x43081D5C2D14A8FAULL, |
||
162 | 0xCD2A5925D9681F90ULL, 0x8FDAB8CE70822903ULL, 0x48CB9AF28ABC72B6ULL, |
||
163 | 0x0A3B7B1923564425ULL, 0x70428B155B4EAF1EULL, 0x32B26AFEF2A4998DULL, |
||
164 | 0xF5A348C2089AC238ULL, 0xB753A929A170F4ABULL, 0x3971ED50550C43C1ULL, |
||
165 | 0x7B810CBBFCE67552ULL, 0xBC902E8706D82EE7ULL, 0xFE60CF6CAF321874ULL, |
||
166 | 0xE224479F47CB76A0ULL, 0xA0D4A674EE214033ULL, 0x67C58448141F1B86ULL, |
||
167 | 0x253565A3BDF52D15ULL, 0xAB1721DA49899A7FULL, 0xE9E7C031E063ACECULL, |
||
168 | 0x2EF6E20D1A5DF759ULL, 0x6C0603E6B3B7C1CAULL, 0xF6FAE5C07D3274CDULL, |
||
169 | 0xB40A042BD4D8425EULL, 0x731B26172EE619EBULL, 0x31EBC7FC870C2F78ULL, |
||
170 | 0xBFC9838573709812ULL, 0xFD39626EDA9AAE81ULL, 0x3A28405220A4F534ULL, |
||
171 | 0x78D8A1B9894EC3A7ULL, 0x649C294A61B7AD73ULL, 0x266CC8A1C85D9BE0ULL, |
||
172 | 0xE17DEA9D3263C055ULL, 0xA38D0B769B89F6C6ULL, 0x2DAF4F0F6FF541ACULL, |
||
173 | 0x6F5FAEE4C61F773FULL, 0xA84E8CD83C212C8AULL, 0xEABE6D3395CB1A19ULL, |
||
174 | 0x90C79D3FEDD3F122ULL, 0xD2377CD44439C7B1ULL, 0x15265EE8BE079C04ULL, |
||
175 | 0x57D6BF0317EDAA97ULL, 0xD9F4FB7AE3911DFDULL, 0x9B041A914A7B2B6EULL, |
||
176 | 0x5C1538ADB04570DBULL, 0x1EE5D94619AF4648ULL, 0x02A151B5F156289CULL, |
||
177 | 0x4051B05E58BC1E0FULL, 0x87409262A28245BAULL, 0xC5B073890B687329ULL, |
||
178 | 0x4B9237F0FF14C443ULL, 0x0962D61B56FEF2D0ULL, 0xCE73F427ACC0A965ULL, |
||
179 | 0x8C8315CC052A9FF6ULL, 0x3A80143F5CF17F13ULL, 0x7870F5D4F51B4980ULL, |
||
180 | 0xBF61D7E80F251235ULL, 0xFD913603A6CF24A6ULL, 0x73B3727A52B393CCULL, |
||
181 | 0x31439391FB59A55FULL, 0xF652B1AD0167FEEAULL, 0xB4A25046A88DC879ULL, |
||
182 | 0xA8E6D8B54074A6ADULL, 0xEA16395EE99E903EULL, 0x2D071B6213A0CB8BULL, |
||
183 | 0x6FF7FA89BA4AFD18ULL, 0xE1D5BEF04E364A72ULL, 0xA3255F1BE7DC7CE1ULL, |
||
184 | 0x64347D271DE22754ULL, 0x26C49CCCB40811C7ULL, 0x5CBD6CC0CC10FAFCULL, |
||
185 | 0x1E4D8D2B65FACC6FULL, 0xD95CAF179FC497DAULL, 0x9BAC4EFC362EA149ULL, |
||
186 | 0x158E0A85C2521623ULL, 0x577EEB6E6BB820B0ULL, 0x906FC95291867B05ULL, |
||
187 | 0xD29F28B9386C4D96ULL, 0xCEDBA04AD0952342ULL, 0x8C2B41A1797F15D1ULL, |
||
188 | 0x4B3A639D83414E64ULL, 0x09CA82762AAB78F7ULL, 0x87E8C60FDED7CF9DULL, |
||
189 | 0xC51827E4773DF90EULL, 0x020905D88D03A2BBULL, 0x40F9E43324E99428ULL, |
||
190 | 0x2CFFE7D5975E55E2ULL, 0x6E0F063E3EB46371ULL, 0xA91E2402C48A38C4ULL, |
||
191 | 0xEBEEC5E96D600E57ULL, 0x65CC8190991CB93DULL, 0x273C607B30F68FAEULL, |
||
192 | 0xE02D4247CAC8D41BULL, 0xA2DDA3AC6322E288ULL, 0xBE992B5F8BDB8C5CULL, |
||
193 | 0xFC69CAB42231BACFULL, 0x3B78E888D80FE17AULL, 0x7988096371E5D7E9ULL, |
||
194 | 0xF7AA4D1A85996083ULL, 0xB55AACF12C735610ULL, 0x724B8ECDD64D0DA5ULL, |
||
195 | 0x30BB6F267FA73B36ULL, 0x4AC29F2A07BFD00DULL, 0x08327EC1AE55E69EULL, |
||
196 | 0xCF235CFD546BBD2BULL, 0x8DD3BD16FD818BB8ULL, 0x03F1F96F09FD3CD2ULL, |
||
197 | 0x41011884A0170A41ULL, 0x86103AB85A2951F4ULL, 0xC4E0DB53F3C36767ULL, |
||
198 | 0xD8A453A01B3A09B3ULL, 0x9A54B24BB2D03F20ULL, 0x5D45907748EE6495ULL, |
||
199 | 0x1FB5719CE1045206ULL, 0x919735E51578E56CULL, 0xD367D40EBC92D3FFULL, |
||
200 | 0x1476F63246AC884AULL, 0x568617D9EF46BED9ULL, 0xE085162AB69D5E3CULL, |
||
201 | 0xA275F7C11F7768AFULL, 0x6564D5FDE549331AULL, 0x279434164CA30589ULL, |
||
202 | 0xA9B6706FB8DFB2E3ULL, 0xEB46918411358470ULL, 0x2C57B3B8EB0BDFC5ULL, |
||
203 | 0x6EA7525342E1E956ULL, 0x72E3DAA0AA188782ULL, 0x30133B4B03F2B111ULL, |
||
204 | 0xF7021977F9CCEAA4ULL, 0xB5F2F89C5026DC37ULL, 0x3BD0BCE5A45A6B5DULL, |
||
205 | 0x79205D0E0DB05DCEULL, 0xBE317F32F78E067BULL, 0xFCC19ED95E6430E8ULL, |
||
206 | 0x86B86ED5267CDBD3ULL, 0xC4488F3E8F96ED40ULL, 0x0359AD0275A8B6F5ULL, |
||
207 | 0x41A94CE9DC428066ULL, 0xCF8B0890283E370CULL, 0x8D7BE97B81D4019FULL, |
||
208 | 0x4A6ACB477BEA5A2AULL, 0x089A2AACD2006CB9ULL, 0x14DEA25F3AF9026DULL, |
||
209 | 0x562E43B4931334FEULL, 0x913F6188692D6F4BULL, 0xD3CF8063C0C759D8ULL, |
||
210 | 0x5DEDC41A34BBEEB2ULL, 0x1F1D25F19D51D821ULL, 0xD80C07CD676F8394ULL, |
||
211 | 0x9AFCE626CE85B507ULL |
||
212 | }; |
||
213 | |||
214 | /* |
||
215 | * ECMA 182 CRC64, taken from https://searchcode.com/file/68313281/lib/crc64.c/ |
||
216 | */ |
||
217 | uint64_t crc64(const unsigned char* data, size_t len) |
||
218 | { |
||
219 | uint64_t crc = 0; |
||
220 | |||
221 | while (len--) { |
||
222 | int i = ((int)(crc >> 56) ^ *data++) & 0xFF; |
||
223 | crc = crc64_tab[i] ^ (crc << 8); |
||
224 | } |
||
225 | |||
226 | return crc; |
||
227 | } |
||
228 | |||
347 | daniel-mar | 229 | uint64_t obfusc(PARM_T* pparm) { |
230 | // Version 6 obfuscation (Introduced in Filter Foundry 1.7.0.10) |
||
292 | daniel-mar | 231 | |
232 | unsigned char* p; |
||
348 | daniel-mar | 233 | uint64_t initial_seed, rolseed; |
350 | daniel-mar | 234 | uint32_t xorseed; |
347 | daniel-mar | 235 | |
349 | daniel-mar | 236 | pparm->unknown1 = 0; |
237 | pparm->unknown2 = 0; |
||
238 | pparm->unknown3 = 0; |
||
239 | |||
292 | daniel-mar | 240 | #ifdef MAC_ENV |
347 | daniel-mar | 241 | // Currently, make_mac.c does not implement modifying the executable code (TODO), |
242 | // so we will use the default initial_seed! |
||
348 | daniel-mar | 243 | initial_seed = cObfuscSeed; |
292 | daniel-mar | 244 | #else |
347 | daniel-mar | 245 | // Give always the same seed if the parameters are the same. No random values. |
246 | // This initial seed will be returned and built into the executable code by make_win.c |
||
350 | daniel-mar | 247 | initial_seed = crc64((unsigned char*)pparm, sizeof(PARM_T)); |
292 | daniel-mar | 248 | #endif |
249 | |||
347 | daniel-mar | 250 | // AFTER unknown1-3 have been set to 0, calculate the checksum! |
251 | pparm->unknown1 = crc32b((char*)pparm, sizeof(PARM_T)); |
||
309 | daniel-mar | 252 | |
350 | daniel-mar | 253 | xorseed = initial_seed & 0xFFFFFFFF; |
292 | daniel-mar | 254 | p = (unsigned char*)pparm; |
350 | daniel-mar | 255 | xorshift(&p, &xorseed, sizeof(PARM_T)); |
292 | daniel-mar | 256 | |
348 | daniel-mar | 257 | rolseed = initial_seed; |
347 | daniel-mar | 258 | p = (unsigned char*)pparm; |
348 | daniel-mar | 259 | rolshift(&p, &rolseed, sizeof(PARM_T)); |
347 | daniel-mar | 260 | |
261 | pparm->unknown2 = 6; // obfusc version |
||
262 | |||
292 | daniel-mar | 263 | return initial_seed; |
264 | } |
||
265 | |||
266 | void deobfusc(PARM_T* pparm) { |
||
309 | daniel-mar | 267 | uint32_t obfusc_version; |
292 | daniel-mar | 268 | size_t size = sizeof(PARM_T); |
269 | |||
293 | daniel-mar | 270 | obfusc_version = obfuscation_version(pparm); |
292 | daniel-mar | 271 | |
272 | switch (obfusc_version) { |
||
273 | case 0: |
||
274 | // no obfuscation |
||
275 | return; |
||
276 | case 1: { |
||
277 | // Version 1 obfuscation (Filter Foundry 1.4b8,9,10) |
||
278 | // Filter built with VC++ (official release by Toby Thain) |
||
279 | |||
280 | unsigned char* p; |
||
281 | size_t i; |
||
309 | daniel-mar | 282 | uint32_t seed; |
292 | daniel-mar | 283 | |
284 | seed = 0xdc43df3c; |
||
285 | |||
286 | for (i = size, p = (unsigned char*)pparm; i--;) { |
||
287 | *p++ ^= rand_msvcc(&seed); |
||
288 | } |
||
289 | break; |
||
290 | } |
||
291 | case 2: { |
||
292 | // Version 2 obfuscation (Filter Foundry 1.7b1) |
||
293 | // Compiler independent |
||
294 | |||
295 | unsigned char* p; |
||
296 | size_t i; |
||
309 | daniel-mar | 297 | uint32_t seed; |
292 | daniel-mar | 298 | |
299 | seed = 0x95d4a68f; |
||
300 | |||
301 | for (i = size, p = (unsigned char*)pparm; i--;) { |
||
302 | seed ^= seed << 13; |
||
303 | seed ^= seed >> 17; |
||
304 | seed ^= seed << 5; |
||
305 | *p++ ^= seed; |
||
306 | } |
||
307 | break; |
||
308 | } |
||
309 | case 3: { |
||
310 | // Version 3 obfuscation (Filter Foundry 1.7.0.5) |
||
311 | // NO loading of other implementation supported, but that doesn't matter since |
||
312 | // obfuscation and protection is combined in Filter Factory >= 1.7.0.5. |
||
313 | // Using rand() is more secure, because it differs from compiler to compiler, so |
||
314 | // it is harder to read a protected 8BF plugin. |
||
315 | // Note that rand() in combination with srand() is deterministic, so it is safe |
||
316 | // to use it: https://stackoverflow.com/questions/55438293/does-rand-function-in-c-follows-non-determinstc-algorithm |
||
317 | // Note: 32-Bit FF is built using OpenWatcom (to support Win95), while 64-Bit FF is built using Microsoft Visual C++ |
||
318 | |||
319 | unsigned char* p; |
||
320 | size_t i; |
||
309 | daniel-mar | 321 | uint32_t seed; |
292 | daniel-mar | 322 | size_t seed_position; |
323 | |||
324 | seed = pparm->unknown2; |
||
325 | seed_position = offsetof(PARM_T, unknown2); // = offsetof(PARM_T_PREMIERE, unknown1) |
||
326 | |||
327 | srand(seed); |
||
329 | daniel-mar | 328 | |
292 | daniel-mar | 329 | p = (unsigned char*)pparm; |
329 | daniel-mar | 330 | for (i = 0; i < seed_position; i++) *p++ ^= (int)(rand() * 1.0 / ((double)RAND_MAX + 1) * 256); |
309 | daniel-mar | 331 | *((uint32_t*)p) = 0; // here was the seed. Fill it with 0x00000000 |
292 | daniel-mar | 332 | p += 4; |
329 | daniel-mar | 333 | for (i = 0; i < size - seed_position - 4; i++) *p++ ^= (int)(rand() * 1.0 / ((double)RAND_MAX + 1) * 256); |
334 | |||
292 | daniel-mar | 335 | break; |
336 | } |
||
337 | case 4: |
||
338 | case 5: { |
||
339 | // Version 4 obfuscation (Filter Foundry 1.7.0.7) |
||
340 | // Version 5 obfuscation (Filter Foundry 1.7.0.8) |
||
341 | // Not compiler dependent, but individual for each build |
||
342 | // It is important that this code works for both x86 and x64 indepdently from the used compiler, |
||
343 | // otherwise, the cross-make x86/x64 won't work! |
||
344 | // Version 5 contains a seed requirement (checksum). |
||
345 | |||
346 | unsigned char* p; |
||
347 | size_t seed_position; |
||
309 | daniel-mar | 348 | uint32_t seed, initial_seed; |
292 | daniel-mar | 349 | |
347 | daniel-mar | 350 | initial_seed = cObfuscSeed & 0xFFFFFFFF; // this value will be manipulated during the building of each individual filter (see make_win.c) |
309 | daniel-mar | 351 | |
352 | seed = initial_seed; |
||
292 | daniel-mar | 353 | seed_position = offsetof(PARM_T, unknown2); // = offsetof(PARM_T_PREMIERE, unknown1) |
354 | |||
309 | daniel-mar | 355 | if (obfusc_version == 5) { |
356 | // make v4 and v5 intentionally incompatible to avoid a downgrade-attack |
||
357 | seed ^= 0xFFFFFFFF; |
||
358 | } |
||
359 | |||
292 | daniel-mar | 360 | p = (unsigned char*)pparm; |
293 | daniel-mar | 361 | xorshift(&p, &seed, seed_position); |
329 | daniel-mar | 362 | *((uint32_t*)p) = 0; // here was the version info. Fill it with 0x00000000 |
363 | p += 4; // obfusc info was 4 or 5 |
||
293 | daniel-mar | 364 | xorshift(&p, &seed, size - seed_position - 4); |
292 | daniel-mar | 365 | |
366 | if (obfusc_version == 5) { |
||
318 | daniel-mar | 367 | pparm->unknown2 = 0; // make sure crc32b matches always |
347 | daniel-mar | 368 | if (crc32b((char*)pparm, sizeof(PARM_T)) != initial_seed) { |
292 | daniel-mar | 369 | // Integrity check failed! |
309 | daniel-mar | 370 | memset(pparm, 0, sizeof(PARM_T)); // invalidate everything |
292 | daniel-mar | 371 | } |
372 | } |
||
373 | |||
374 | break; |
||
375 | } |
||
347 | daniel-mar | 376 | case 6: { |
377 | // Version 6 obfuscation (Filter Foundry 1.7.0.10) |
||
378 | // Not compiler dependent, but individual for each build |
||
379 | // It is important that this code works for both x86 and x64 indepdently from the used compiler, |
||
380 | // otherwise, the cross-make x86/x64 won't work! |
||
381 | |||
382 | unsigned char* p; |
||
350 | daniel-mar | 383 | uint32_t xorseed, checksum; |
348 | daniel-mar | 384 | uint64_t initial_seed, rolseed; |
385 | |||
386 | initial_seed = cObfuscSeed; // this value will be manipulated during the building of each individual filter (see make_win.c) |
||
347 | daniel-mar | 387 | |
348 | daniel-mar | 388 | rolseed = initial_seed; |
347 | daniel-mar | 389 | p = (unsigned char*)pparm; |
348 | daniel-mar | 390 | rolshift(&p, &rolseed, sizeof(PARM_T)); |
347 | daniel-mar | 391 | |
350 | daniel-mar | 392 | xorseed = initial_seed & 0xFFFFFFFF; |
347 | daniel-mar | 393 | p = (unsigned char*)pparm; |
350 | daniel-mar | 394 | xorshift(&p, &xorseed, sizeof(PARM_T)); |
347 | daniel-mar | 395 | |
396 | checksum = pparm->unknown1; |
||
397 | |||
398 | pparm->unknown1 = 0; |
||
399 | pparm->unknown2 = 0; |
||
400 | pparm->unknown3 = 0; |
||
401 | |||
402 | if (checksum != crc32b((char*)pparm, sizeof(PARM_T))) { |
||
403 | // Integrity check failed! |
||
404 | memset(pparm, 0, sizeof(PARM_T)); // invalidate everything |
||
405 | } |
||
406 | |||
407 | break; |
||
408 | } |
||
292 | daniel-mar | 409 | default: { |
410 | // Obfuscation version unexpected! |
||
309 | daniel-mar | 411 | memset(pparm, 0, sizeof(PARM_T)); // invalidate everything |
311 | daniel-mar | 412 | |
413 | // If "return" is present: Calling function will receive an invalid cbSize value, hence showing "incompatible obfuscation" |
||
414 | // 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" |
||
415 | return; |
||
292 | daniel-mar | 416 | } |
417 | } |
||
418 | |||
309 | daniel-mar | 419 | if ((pparm->cbSize != PARM_SIZE) && |
420 | //(pparm->cbSize != PARM_SIZE_PREMIERE) && |
||
421 | (pparm->cbSize != PARM_SIG_MAC)) { |
||
422 | memset(pparm, 0, sizeof(PARM_T)); // invalidate everything |
||
423 | } |
||
424 | |||
292 | daniel-mar | 425 | if (obfusc_version >= 3) { |
426 | // Filter Foundry >= 1.7.0.5 builds combines obfuscation and protection |
||
427 | // when a standalone filter is built. Theoretically, you can un-protect a |
||
428 | // plugin, even if it is obfuscated, just by bit-flipping the LSB of byte 0x164. |
||
429 | // Therefore, we enforce that the plugin is protected! |
||
430 | pparm->iProtected = 1; |
||
431 | |||
432 | // Furthermore, if obfuscation 3+ failed (since the seed is individual for each 8BF file), |
||
293 | daniel-mar | 433 | // we still want that load_*.c is able to detect pparm->iProtected instead |
434 | // of throwing the error "Incompatible obfuscation". |
||
292 | daniel-mar | 435 | pparm->cbSize = PARM_SIZE; |
436 | } |
||
312 | daniel-mar | 437 | |
438 | if (obfusc_version >= 1) { |
||
439 | // information was lost due to obfuscation. Make sure it is zero. |
||
440 | pparm->unknown2 = 0; |
||
441 | } |
||
292 | daniel-mar | 442 | } |