void decrypt(uint8_t *data, int dataLength, const uint8_t *key, int keyLength) {
    uint8_t v4[256];
    uint8_t v5[256];

    for (int i = 0; i < 256; i++) {
        v4[i] = i;
        v5[i] = key[i % keyLength];
    }

    uint8_t v13 = 0;

    for (int i = 0; i < 256; i++) {
        uint8_t tmp = v4[i];
        v13 = (v5[i] + v4[i] + v13) % 256;
        v4[i] = v4[v13];
        v4[v13] = tmp;
    }

    uint8_t v14 = 0;
    uint8_t v9 = 0;

    for (int i = 0; i < dataLength; i++) {
        v9++;

        uint8_t v10 = v4[v9];
        uint8_t v11 = v4[v9];

        v14 += v4[v9];

        uint8_t *v12 = &v4[v14];
        v4[v9] = *v12;
        *v12 = v10;

        data[i] ^= v4[(v4[v9] + v11) % 256];
    }
}