Function EncryptString

KingHamlet/main.cpp:286–320

}

DWORD EncryptString(const unsigned char* lpData, const char* lpKey, unsigned char*& lpOut, DWORD dwDataSize)
{
	unsigned char btBlock[16];
	unsigned char btKey[16];
	unsigned int dwOutLen = 0;
	unsigned int iMul = 0;

	if ((dwDataSize % 16))
		iMul = 1;

	dwOutLen = ((dwDataSize / 16) + iMul) * 16;

	lpOut = (unsigned char*)malloc(dwOutLen + 1);

	memset(lpOut, 0x00, dwOutLen + 1);

	memset(btKey, 0x00, 16);

	memcpy(btKey, lpKey, strlen(lpKey) > 16 ? 16 : strlen(lpKey));

	for (int i = 0; i * 16 < dwDataSize; ++i) {

		unsigned int uiBlockSize = 16;

		if ((dwDataSize - (i * 16)) < 16)
			uiBlockSize = (dwDataSize - (i * 16));

		memset(btBlock, 0x00, 16);
		memcpy(btBlock, lpData + (i * 16), uiBlockSize);

		AES_ECB_encrypt(lpData + (i * 16), btKey, lpOut + (i * 16), 16);
	}

	return dwOutLen;
}

DWORD DecryptString(const unsigned char* lpData, const char* lpKey, unsigned char*& lpOut, DWORD dwDataSize)
{