int Key_gen(uint8_t addressOut[16],
            uint8_t publicKeyOut[32],
            uint8_t privateKeyOut[32],
            struct Random* rand)
{
    for (;;) {
        Random_bytes(rand, privateKeyOut, 32);
        crypto_scalarmult_curve25519_base(publicKeyOut, privateKeyOut);
        // Brute force for keys until one matches FC00:/8
        if (AddressCalc_addressForPublicKey(addressOut, publicKeyOut)) {
            return 0;
        }
    }
}