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utils.cpp
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utils.cpp
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#include "utils.hpp"
void utils::pushToVector(std::vector<unsigned char>& m_EncryptedArrayVec, const std::string& parsedString)
{
for (size_t i = 0; i < parsedString.size(); i++)
{
m_EncryptedArrayVec.push_back(static_cast<unsigned char>(parsedString[i]));
}
}
void utils::padEncryptedArray(std::vector<unsigned char>& vectorInput, const size_t parsedStringSize, const size_t expectedLength)
{
if (parsedStringSize < expectedLength)
{
int padLength = expectedLength - parsedStringSize;
for (size_t i = 0; i < padLength; i++)
vectorInput.push_back('\0');
}
}
bool utils::validateCopyFunction(minsn_t* instruction)
{
mcallinfo_t* callInfo = instruction->d.f;
if (!callInfo)
{
error("[-] Function's args is empty\n");
return false;
}
mcallargs_t& callArgs = callInfo->args;
if (callArgs.size() != 2 && !qstrcmp(instruction->l.helper, "strcpy"))
{
error("[-] Number of strcpy function's args is incorrect\n");
return false;
}
if (callArgs.size() != 3 && !qstrcmp(instruction->l.helper, "memcpy"))
{
error("[-] Number of memcpy function's args is incorrect\n");
return false;
}
return true;
}
void utils::pushIntegerToVector(std::vector<unsigned char>& vec, unsigned long long input, const size_t length)
{
for (size_t i = 0; i < length; i++)
{
vec.push_back((input >> (i * 8)) & 0xff);
}
}
std::string utils::parseEscapedString(char* input)
{
std::pair<const char, const char> const targetCharacters[]
{
{ 'a', 0x7 },
{ 'b', 0x8 },
{ 'f', 0xC },
{ 'n', 0xA },
{ 'r', 0xD },
{ 't', 0x9 },
{ 'v', 0xB },
{ '"', 0x22},
{'\\', '\\'}
};
std::string parsedStr;
for (size_t i = 1; i <= strlen(input); ++i)
{
parsedStr += input[i - 1];
for (std::pair<const char, const char> const character : targetCharacters)
{
if (input[i] == character.first && input[i - 1] == '\\')
{
parsedStr[i - 1] = character.second;
i += 1;
break;
}
}
}
return parsedStr;
}
void utils::unescapeString(char* input, std::string& parsedRC4Key)
{
for (size_t i = 0; i < strlen(input); i++)
{
if (input[i] == '\\' && input[i + 1] == '\\')
{
parsedRC4Key += "\\";
i++;
continue;
}
parsedRC4Key += input[i];
}
}
bool utils::isPrintableAscii(unsigned char* string)
{
for (int i = 0; string[i] != '\0'; i++)
{
bool isPrintableAscii = (string[i] & ~0x7f) == 0 && (isprint(string[i]) || isspace(string[i]));
if (!isPrintableAscii)
return false;
}
return true;
}
void utils::unpad(unsigned char* input, const size_t arrayLen)
{
size_t lastElement = input[arrayLen - 1];
if (lastElement > arrayLen)
{
return;
}
size_t stringLen = arrayLen - lastElement;
std::memcpy(input, input, stringLen);
input[stringLen] = '\0';
}
void utils::rc4_setup(struct rc4_state* s, unsigned char* key, int length)
{
int i, j, k, * m, a;
s->x = 0;
s->y = 0;
m = s->m;
for (i = 0; i < 256; i++)
{
m[i] = i;
}
j = k = 0;
for (i = 0; i < 256; i++)
{
a = m[i];
j = (unsigned char)(j + a + key[k]);
m[i] = m[j]; m[j] = a;
if (++k >= length) k = 0;
}
}
void utils::rc4_crypt(struct rc4_state* s, unsigned char* data, int length)
{
int i, x, y, * m, a, b;
x = s->x;
y = s->y;
m = s->m;
for (i = 0; i < length; i++)
{
x = (unsigned char)(x + 1); a = m[x];
y = (unsigned char)(y + a);
m[x] = b = m[y];
m[y] = a;
data[i] ^= m[static_cast<unsigned char>(a + b)];
}
s->x = x;
s->y = y;
}
unsigned char* utils::decryptAESCBC(const unsigned char* AESKey, const unsigned char* AESIV, const unsigned char* input, const size_t& inputLength)
{
if (!inputLength || (inputLength % 16))
return nullptr;
AES aes(AESKeyLength::AES_256);
unsigned char* decryptedString = aes.DecryptCBC(input, inputLength, AESKey, AESIV);
unpad(decryptedString, inputLength);
return decryptedString;
}
void utils::setDecompilerComment(cfunc_t& cfunc, unsigned long address, const std::string& decryptedString)
{
treeloc_t ref_tree;
ref_tree.ea = address;
ref_tree.itp = ITP_SEMI;
cfunc.set_user_cmt(ref_tree, decryptedString.c_str());
}