HMAC

//密钥散列消息认证码
QString HMAC(QByteArray baseString, QByteArray key, QCryptographicHash::Algorithm type = QCryptographicHash::Algorithm::Sha256);

QString HMAC(QByteArray baseString, QByteArray key, QCryptographicHash::Algorithm type)
{
	//HMAC-SHA-1 block size
	int blockSize = 64;
	//if key is longer than block size (64), reduce key length with SHA-1 compression
	if (key.length() > blockSize)
	{
		key = QCryptographicHash::hash(key, type);
	}
	//initialize inner padding with char "6"
	QByteArray innerPadding(blockSize, char(0x36));
	//initialize outer padding with char "/"
	QByteArray outerPadding(blockSize, char(0x5c));
	//ascii characters 0x36 ("6") and 0x5c ("/") are selected because they have large
	//Hamming distance (http://en.wikipedia.org/wiki/Hamming_distance)
	for (int i = 0; i < key.length(); i++) 
	{
		//XOR operation between every byte in key and innerpadding, of key length
		innerPadding[i] = innerPadding[i] ^ key.at(i);
		//XOR operation between every byte in key and outerpadding, of key length
		outerPadding[i] = outerPadding[i] ^ key.at(i);
	}
	QByteArray total = outerPadding;
	QByteArray part = innerPadding;
	part.append(baseString);
	total.append(QCryptographicHash::hash(part, type));
	QByteArray hashed = QCryptographicHash::hash(total, type);
	return QByteArray::fromHex(hashed.toHex()).toHex();
}