76 lines
2.0 KiB
C++
76 lines
2.0 KiB
C++
// PRIVATE
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namespace anticheat {
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bool tampered;
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void save(FILE *f) {
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int cert = 0x1234;
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for(int i=0; i<boxid; i++)
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cert = 3 * cert + (761349061 + 1463190*i) * savebox[i];
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if(!tampered) fprintf(f, " C %d\n", cert);
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}
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bool load(FILE *f, score& sc, string ver) {
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int cert = 0x1234;
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for(int i=0; i<boxid; i++)
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cert = 3 * cert + (761349061 + 1463190*i) * sc.box[i];
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char cr;
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int scert;
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int err = fscanf(f, "%c%d", &cr, &scert);
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if(err != 2) return true;
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// if(cr == 'C' && cert == scert) printf("Certificate OK\n");
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return cert != scert;
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}
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int vcertify(string ver, string ss, int a, int b, int c, int d) {
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ss = ver + ss;
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const char *s = ss.c_str();
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if(tampered) return -1;
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int cert = 0x5678;
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while(*s) cert = cert * 37113 + (*s), s++;
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cert = cert + a * 681491 + b * 681390411 + c * 581911 + d * 16406101;
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return cert;
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}
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int certify(string ss, int a, int b, int c, int d) {
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return vcertify(VER, ss, a, b, c, d);
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}
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int check(int cv, const string& ver, const string& s, int a, int b, int c, int d) {
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if(ver < "8.0f" && cv == d) return true;
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return cv == vcertify(ver, s, a, b, c, d);
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}
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void nextid(int& tid, const string& ver, int cert) {
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if(ver >= "8.0i") tid += 1 + cert + cert * cert / 7;
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else tid++;
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}
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// 8.0i: ver included in achievements
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// 8.0f: fixed in Windows
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}
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#ifndef MOBILE
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void SDL_Delay_anticheat(int i) {
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saveBox();
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int i0 = 0; savebox[1] = savebox[65] = anticheat::tampered; // do not consider Timer
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for(int t=0; t<boxid; t++)
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i0 = 73 * i0 + savebox[t] + savebox[t] * (savebox[t] + 7103);
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for(int t=0; t<boxid; t++) savebox[t] = 0;
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SDL_Delay(i);
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saveBox();
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int i1 = 0; savebox[1] = savebox[65] = anticheat::tampered; // do not consider Timer
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for(int t=0; t<boxid; t++)
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i1 = 73 * i1 + savebox[t] + savebox[t] * (savebox[t] + 7103);
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if(i0 != i1) {
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anticheat::tampered = true;
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}
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}
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#endif
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#define SDL_Delay SDL_Delay_anticheat
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