QString InttoBinary(const QString &in) //assumes valid integer entry!
{
QString out;
std::string temp = in.toStdString();
BigUnsigned val = stringToBigUnsigned(temp); //need BigUnsigned for arbitrary
//length integers
BigUnsigned rem;
while(val > 0)
{
rem = val % 2;
if(rem == 0)
out.prepend("0");
else
out.prepend("1");
val /= 2;
}
while(out.size() % 8 != 0)
out.prepend("0");
return out;
}
SecureArray QCACryptoInterface::sharedDHKey(const QString &prime, const QString &base, const QString &secret)
{
BigUnsigned primeNumber = stringToBigUnsigned(prime.toStdString());
BigInteger baseNumber = stringToBigUnsigned(base.toStdString());
BigUnsigned secretNumber = stringToBigUnsigned(secret.toStdString());
BigUnsigned result = modexp(baseNumber, secretNumber, primeNumber);
QByteArray key;
BigUnsigned result2(result);
while (result2 != 0) {
char rest = (result2 % 256).toUnsignedShort();
key.prepend(rest);
result2 = result2 / 256;
}
int size = key.size();
return key;
}
BigInteger stringToBigInteger(const std::string &s) {
// Recognize a sign followed by a BigUnsigned.
return (s[0] == '-') ? BigInteger(stringToBigUnsigned(s.substr(1, s.length() - 1)), BigInteger::negative)
: (s[0] == '+') ? BigInteger(stringToBigUnsigned(s.substr(1, s.length() - 1)))
: BigInteger(stringToBigUnsigned(s));
}
