Decryption key in RSA Encryption.

See more:

cryptography

C++11

I wrote a code to generate a public key and a private key value. Below is the code :

void keys(long long int &e_key,long long int &d_key,long long int phival)
    {

        e_key = genrndnum(100,(phival-1));

        while(gcd(e_key,phival)!=1)
        {
                e_key = genrndnum(100,(phival-1));

        }

        d_key = genrndnum(100,(phival-1));

        while((d_key*e_key)!=(1%phival))
        {
            Sleep(1000);
                d_key = genrndnum(100,(phival-2));

        if((d_key*e_key)==(1%phival))
        {
            return;
        }
        }

The problem is i don't get the correct encryption and decryption exponents.

What is wrong with above code ?