Dexter base 64 encoding snippet

libencode.cpp

//https://github.com/twelvesec/dexter
//GNU General Public License v3.0
//@maldevel

//...

std::string libencode::base64_encode(std::string plaintext) {
	std::string encodedtext;
	DWORD size = 0;
	char *dest;

	if (CryptBinaryToStringA((BYTE*)plaintext.c_str(), (DWORD)plaintext.length(), CRYPT_STRING_BASE64 | CRYPT_STRING_NOCRLF, NULL, &size) == FALSE) {
		return "";
	}

	if ((dest = (char*)HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, size + 1)) == NULL) {
		return "";
	}

	if (CryptBinaryToStringA((BYTE*)plaintext.c_str(), (DWORD)plaintext.length(), CRYPT_STRING_BASE64 | CRYPT_STRING_NOCRLF, dest, &size) == FALSE)
	{
		HeapFree(GetProcessHeap(), 0, dest);
		dest = NULL;
		return "";
	}

	dest[size] = 0;
	encodedtext = std::string(dest);
	HeapFree(GetProcessHeap(), 0, dest);
	dest = NULL;

	return encodedtext;
}

std::string libencode::base64_decode(std::string encodedtext) {
	std::string plaintext;
	DWORD size = 0;
	BYTE *dest;

	if (CryptStringToBinaryA(encodedtext.c_str(), (DWORD)encodedtext.length(), CRYPT_STRING_BASE64, NULL, &size, NULL, NULL) == FALSE) {
		return "";
	}

	if ((dest = (BYTE*)HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, size + 1)) == NULL) {
		return "";
	}

	if (CryptStringToBinaryA(encodedtext.c_str(), (DWORD)encodedtext.length(), CRYPT_STRING_BASE64, dest, &size, NULL, NULL) == FALSE) {
		HeapFree(GetProcessHeap(), 0, dest);
		dest = NULL;
		return "";
	}

	dest[size] = 0;
	plaintext = std::string((char*)dest);
	HeapFree(GetProcessHeap(), 0, dest);
	dest = NULL;

	return plaintext;
}