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CRITICAL FIX: Not all differentials can cause Diff test failures
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This is reported bug rurban#199:  rurban#199

To see this bug in action, apply the following patch (without this fix!):
@@ -158,7 +158,7 @@ bool DiffTest ( pfHash hash, int diffbits, int reps, bool dumpCollisions )
          reps,testcount,expected);

   Hash_Seed_init (hash, g_seed);
-  for(int i = 0; i < reps; i++)
+  for(int i = 0; i < 0; i++)
   {
     if(i % (reps/10) == 0) printf(".");

@@ -173,6 +173,10 @@ bool DiffTest ( pfHash hash, int diffbits, int reps, bool dumpCollisions )

   bool result = true;

+  r.rand_p(&k1,sizeof(keytype));
+  diffs.push_back(k1);
+  diffs.push_back(k1);
+
   result &= ProcessDifferentials(diffs,reps,dumpCollisions);

   return result;
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fwojcik committed Aug 18, 2022
1 parent 9ca4884 commit e3036ec
Showing 1 changed file with 2 additions and 0 deletions.
2 changes: 2 additions & 0 deletions DifferentialTest.h
Original file line number Diff line number Diff line change
Expand Up @@ -65,6 +65,8 @@ bool ProcessDifferentials ( std::vector<keytype> & diffs, int reps, bool dumpCol

if(count > 1)
{
result = false;

if(dumpCollisions)
{
double pct = 100 * (double(count) / double(reps));
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