someone published keygen for iou

#include <stdio.h>
#include <unistd.h>
#include <stdint.h>
#include <string.h>
#include <openssl/md5.h>

int main () {
    uint32_t hostid,i;
    uint8_t hid[4];
    uint8_t a1[] = { 0x4B,0x58,0x21,0x81,0x56,0x7B,0x0D,0xF3,0x21,0x43,0x9B,0x7E,0xAC,0x1D,0xE6,0x8A };

    uint8_t a2[] = {
        0x80,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
        0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
        0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00
    };

    char s[255];

    MD5_CTX ctx;
    gethostname(s,0x100);
    hostid = gethostid();
    for (i=0; i<strlen(s); i++) {
        hostid += *(s + i);
    }

    hid[0] = (hostid >> 24) & 0xFF;
    hid[1] = (hostid >> 16) & 0xFF;
    hid[2] = (hostid >> 8) & 0xFF;
    hid[3] = (hostid) & 0xFF;

    MD5_Init(&ctx);
    MD5_Update(&ctx,a1,16);
    MD5_Update(&ctx,a2,40);
    MD5_Update(&ctx,&hid,4);
    MD5_Update(&ctx,a1,16);
    MD5_Final(s,&ctx);

    for (i=0; i<8; i++) {
        printf("%X",(s[i]&0xFF));
    }

    printf("\n");
    
    return 0;
}