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aes comment decryption stuffs

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This commit is contained in:
Hazim Gazov
2010-08-01 07:01:24 +00:00
parent 62c1bd007f
commit d2e31a87f4
2 changed files with 96 additions and 54 deletions
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3
indra/llimage/CMakeLists.txt
View File

@@ -19,6 +19,7 @@ include_directories(
)
set(llimage_SOURCE_FILES
aes.cpp
llimagebmp.cpp
llimage.cpp
llimagedxt.cpp
@@ -33,7 +34,7 @@ set(llimage_SOURCE_FILES
set(llimage_HEADER_FILES
CMakeLists.txt
aes.h
llimage.h
llimagebmp.h
llimagedxt.h

147
indra/llimage/llimagemetadatareader.cpp
View File

@@ -1,7 +1,12 @@
// <edit>
#include "linden_common.h"
#include "llimagemetadatareader.h"
//#define COMMENT_DEBUGGING
#include "aes.h"
#include "llerror.h"
const unsigned long EMKDU_AES_KEY[] = {0x7810001, 0x0FEB67863, 0x12B03F6E, 0x0C16665CC, 0x0C1AC9681, 0x0F70B663B};
//const unsigned char EMKDU_AES_KEY[] = {0x01,0x00,0x81,0x07,0x63,0x78,0xB6,0xFE,0x6E,0x3F,0xB0,0x12,0xCC,0x65,0x66,0xC1,
//0x81,0x96,0xAC,0xC1,0x3B,0x66,0x0B,0xF7};
//#define COMMENT_DEBUGG1ING
LLJ2cParser::LLJ2cParser(U8* data,int data_size)
{
if(data && data_size)
@@ -49,20 +54,20 @@ std::vector<U8> LLJ2cParser::GetNextComment()
U8 marker_type = nextChar();
if (marker_type == 0x4f)
{
continue;
continue;
}
if (marker_type == 0x90)
{
//llinfos << "FOUND 0x90" << llendl;
break; //return empty vector
//llinfos << "FOUND 0x90" << llendl;
break; //return empty vector
}
if (marker_type == 0x64)
{
//llinfos << "FOUND 0x64 COMMENT SECTION" << llendl;
S32 len = ((S32)nextChar())*256 + (S32)nextChar();
if (len > 3) content = nextCharArray(len - 2);
return content;
//llinfos << "FOUND 0x64 COMMENT SECTION" << llendl;
S32 len = ((S32)nextChar())*256 + (S32)nextChar();
if (len > 3) content = nextCharArray(len - 2);
return content;
}
}
}
@@ -74,59 +79,95 @@ std::vector<U8> LLJ2cParser::GetNextComment()
std::string LLImageMetaDataReader::ExtractEncodedComment(U8* data,int data_size)
{
LLJ2cParser parser = LLJ2cParser(data,data_size);
std::string result;
while(1)
{
std::vector<U8> comment = parser.GetNextComment();
if (comment.empty()) break; //exit loop
#ifndef COMMENT_DEBUGGING
if (comment[1] == 0x00 && comment.size() == 130)
{
//llinfos << "FOUND PAYLOAD" << llendl;
std::vector<U8> payload(128);
S32 i;
memcpy(&(payload[0]), &(comment[2]), 128);
//std::copy(comment.begin()+2,comment.end(),payload.begin());
if (payload[2] == payload[127])
{
// emkdu.dll
for (i = 4; i < 128; i += 4)
{
payload[i] ^= payload[3];
payload[i + 1] ^= payload[1];
payload[i + 2] ^= payload[0];
payload[i + 3] ^= payload[2];
}
}
else if (payload[3] == payload[127])
{
// emkdu.dll or onyxkdu.dll
for (i = 4; i < 128; i += 4)
{
payload[i] ^= payload[2];
payload[i + 1] ^= payload[0];
payload[i + 2] ^= payload[1];
payload[i + 3] ^= payload[3];
}
}
else
{
break;//exit loop
}
for (i = 4; i < 128; ++i)
{
if (payload[i] == 0) break;
}
if(i < 4) break;
std::string result(payload.begin()+4,payload.begin()+i);
//llinfos << "FOUND COMMENT: " << result << llendl;
return result;
bool xorComment = true;
//llinfos << "FOUND PAYLOAD" << llendl;
std::vector<U8> payload(128);
S32 i;
memcpy(&(payload[0]), &(comment[2]), 128);
//std::copy(comment.begin()+2,comment.end(),payload.begin());
//lets check XOR Cipher first
if (payload[2] == payload[127])
{
// emkdu.dll
for (i = 4; i < 128; i += 4)
{
payload[i] ^= payload[3];
payload[i + 1] ^= payload[1];
payload[i + 2] ^= payload[0];
payload[i + 3] ^= payload[2];
}
}
else if (payload[3] == payload[127])
{
// emkdu.dll or onyxkdu.dll
for (i = 4; i < 128; i += 4)
{
payload[i] ^= payload[2];
payload[i + 1] ^= payload[0];
payload[i + 2] ^= payload[1];
payload[i + 3] ^= payload[3];
}
}
else
{
xorComment = false;
}
if(!xorComment)
{
//this is terrible i know
std::vector<U8> dataout(128);
CRijndael aes;
try
{
aes.MakeKey(reinterpret_cast<const char*>(EMKDU_AES_KEY),"", 24, 16);
} catch(std::string error)
{
llinfos << error << llendl;
}
try
{
aes.Decrypt((char*)&(payload[0]), (char*)&(dataout[0]), 16, CRijndael::ECB);
} catch(std::string error)
{
llinfos << error << llendl;
}
//payload.clear();
//memcpy(&(payload[0]),&(dataout[0]),dataout.size());
for (i = 0 ; i < 128; ++i)
{
if (dataout[i] == '\0') break;
}
if(i == 0) continue;
if(result.length() > 0)
result.append(" ");
result = "(AES) ";
result.append(dataout.begin(),dataout.begin()+i);
}
else
{
for (i = 4 ; i < 128; ++i)
{
if (payload[i] == 0) break;
}
if(i < 4) continue;
if(result.length() > 0)
result.append(" ");
result = "(XOR) ";
result.append(payload.begin()+4,payload.begin()+i);
}
//llinfos << "FOUND COMMENT: " << result << llendl;
}
#else
std::string result(comment.begin(),comment.end());
return result;
#endif
}
//end of loop
return "";
return result;
}
// </edit>