Function SetClientCrypt

src/Config.cpp:242–292

Reference: https://github.com/polserver/polserver/blob/5c747bb88123945bb892d3d793b89afcb1dc645a/pol-core/pol/crypt/cryptkey.cpp

// Reference: https://github.com/polserver/polserver/blob/5c747bb88123945bb892d3d793b89afcb1dc645a/pol-core/pol/crypt/cryptkey.cpp
static void SetClientCrypt(uint32_t version)
{
    if (version == CV_200X)
    {
        if (!g_Config.ClientKeysSet)
        {
            g_Config.Key1 = 0x2D13A5FC;
            g_Config.Key2 = 0x2D13A5FD;
            g_Config.Key3 = 0xA39D527F;
        }
        g_Config.EncryptionType = ET_203;
        return;
    }

    if (!g_Config.ClientKeysSet)
    {
        int a = (version >> 24) & 0xff;
        int b = (version >> 16) & 0xff;
        int c = (version >> 8) & 0xff;

        int temp = ((a << 9 | b) << 10 | c) ^ ((c * c) << 5);
        g_Config.Key2 = (temp << 4) ^ (b * b) ^ (b * 0x0B000000) ^ (c * 0x380000) ^ 0x2C13A5FD;
        temp = (((a << 9 | c) << 10 | b) * 8) ^ (c * c * 0x0c00);
        g_Config.Key3 = temp ^ (b * b) ^ (b * 0x6800000) ^ (c * 0x1c0000) ^ 0x0A31D527F;

        // Configurator does this, not sure why
        // lets keep compatibility until we understand more
        g_Config.Key1 = g_Config.Key2 - 1;
    }

    if (version < VERSION(1, 25, 35, 0))
    {
        g_Config.EncryptionType = ET_OLD_BFISH;
    }
    else if (version == VERSION(1, 25, 36, 0))
    {
        g_Config.EncryptionType = ET_1_25_36;
    }
    else if (version < CV_200)
    {
        g_Config.EncryptionType = ET_BFISH;
    }
    else if (version <= VERSION(2, 0, 3, 0))
    {
        g_Config.EncryptionType = ET_203;
    }
    else
    {
        g_Config.EncryptionType = ET_TFISH;
    }
}

static void ClientVersionFixup(bool overrideProtocolVersion)
{