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> I'd expect just casting the pointer type before dereferencing:
>
> unsigned char *p;
> ...
> hash = (multiplier * hash) ^ *((Py_uhash_t *)p);
>
> (don't use size_t, use Py_uhash_t)
Is p guaranteed to be size_t aligned?
If not, unaligned access can segfault (e.g. on Sparc IIRC).
> Also it may make DoS attacks easier.
Indeed.
And the increase in collision you demonstrated in your previous
message worries me (both security and performance wise).