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| // sna@reteam.org - 6th of April 2005
// unwand.cpp //
#include <iostream>
#include <string.h>
#include <openssl/md5.h>
#include <openssl/des.h>
const unsigned char opera_salt[11] =
{
0x83, 0x7D, 0xFC, 0x0F, 0x8E, 0xB3, 0xE8, 0x69, 0x73, 0xAF, 0xFF
};
int main(int argc, char **argv)
{
if(argc != 2)
{
std::cout << "Usage: unwand <opera wand file>" << std::endl;
return 1;
}
FILE *fdWand = fopen(argv[1], "rb");
if(NULL == fdWand)
{
perror("Failed to open file");
return 1;
}
fseek(fdWand, 0, SEEK_END);
unsigned long fileSize = ftell(fdWand);
unsigned char *wandData = (unsigned char *)malloc(fileSize);
if(NULL == wandData)
{
fclose(fdWand);
perror("Memory allocation failed");
return 1;
}
rewind(fdWand);
fread(wandData, fileSize, 1, fdWand);
fclose(fdWand);
unsigned long wandOffset = 0;
//
// main loop, find and process encrypted blocks
//
while(wandOffset < fileSize)
{
// find key length field at start of block
unsigned char *wandKey = (unsigned char *)
memchr(wandData + wandOffset, DES_KEY_SZ, fileSize - wandOffset);
if(NULL == wandKey)
{
break;
}
wandOffset = ++wandKey - wandData;
// create pointers to length fields
unsigned char *blockLengthPtr = wandKey - 8;
unsigned char *dataLengthPtr = wandKey + DES_KEY_SZ;
if(blockLengthPtr < wandData || dataLengthPtr > wandData + fileSize)
{
continue;
}
// convert big-endian numbers to native
unsigned long
blockLength = *blockLengthPtr++ << 24;
blockLength |= *blockLengthPtr++ << 16;
blockLength |= *blockLengthPtr++ << 8;
blockLength |= *blockLengthPtr;
unsigned long
dataLength = *dataLengthPtr++ << 24;
dataLength |= *dataLengthPtr++ << 16;
dataLength |= *dataLengthPtr++ << 8;
dataLength |= *dataLengthPtr;
// as discussed in the article
if(blockLength != dataLength + DES_KEY_SZ + 4 + 4)
{
continue;
}
// perform basic sanity checks on data length
if(dataLength > fileSize - (wandOffset + DES_KEY_SZ + 4)
|| dataLength < 8 || dataLength % 8 != 0)
{
continue;
}
unsigned char
hashSignature1[MD5_DIGEST_LENGTH],
hashSignature2[MD5_DIGEST_LENGTH],
tmpBuffer[512];
//
// hashing of (salt, key), (hash, salt, key)
//
memcpy(tmpBuffer, opera_salt, sizeof(opera_salt));
memcpy(tmpBuffer + sizeof(opera_salt), wandKey, DES_KEY_SZ);
MD5(tmpBuffer, sizeof(opera_salt) + DES_KEY_SZ, hashSignature1);
memcpy(tmpBuffer, hashSignature1, sizeof(hashSignature1));
memcpy(tmpBuffer + sizeof(hashSignature1),
opera_salt, sizeof(opera_salt));
memcpy(tmpBuffer + sizeof(hashSignature1) +
sizeof(opera_salt), wandKey, DES_KEY_SZ);
MD5(tmpBuffer, sizeof(hashSignature1) +
sizeof(opera_salt) + DES_KEY_SZ, hashSignature2);
//
// schedule keys. key material from hashes
//
DES_key_schedule key_schedule1, key_schedule2, key_schedule3;
DES_set_key_unchecked((const_DES_cblock *)&hashSignature1[0],
&key_schedule1);
DES_set_key_unchecked((const_DES_cblock *)&hashSignature1[8],
&key_schedule2);
DES_set_key_unchecked((const_DES_cblock *)&hashSignature2[0],
&key_schedule3);
DES_cblock iVector;
memcpy(iVector, &hashSignature2[8], sizeof(DES_cblock));
unsigned char *cryptoData = wandKey + DES_KEY_SZ + 4;
//
// decrypt wand data in place using 3DES-CBC
//
DES_ede3_cbc_encrypt(cryptoData, cryptoData, dataLength,
&key_schedule1, &key_schedule2, &key_schedule3, &iVector, 0);
if(0x00 == *cryptoData || 0x08 == *cryptoData)
{
std::wcout << L"<null>" << std::endl;
}
else
{
// remove padding (data padded up to next block)
unsigned char *padding = cryptoData + dataLength - 1;
memset(padding - (*padding - 1), 0x00, *padding);
//uncomment if Windows platform
//std::wcout << (wchar_t *)cryptoData << std::endl;
// dump byte-aligned data[dataLength] little endian UTF-16 as UTF-8. (c) Madhu
for (unsigned int i = 0; i < dataLength; i+=2) {
int uch = cryptoData[i];
uch = uch | cryptoData[i+1];
if (uch == 0) break;
if (uch > 0x7FF)
std::cout << (unsigned char) (((uch >> 12) & 0xF) | 0xE0)
<< (unsigned char) (((uch >> 6) & 0x3F) | 0x80)
<< (unsigned char) ((uch & 0x3F) | 0x80);
else if (uch > 0x7F)
std::cout << (unsigned char) (((uch >> 6) & 0x1F) | 0xC0)
<< (unsigned char) ((uch & 0x3F) | 0x80);
else std::cout << (unsigned char) uch;
}
}
std::cout << std::endl;;
wandOffset = wandOffset + DES_KEY_SZ + 4 + dataLength;
}
free(wandData);
return 0;
} |
