Beware Adler32.update ( int )! It accepts only an unsigned 8-bit byte packed in the low order bits of an int. You can’t feed update() a 32-bit int.
Adler-32 has a weakness for very short messages. For very short packets, Adler-32 is guaranteed to give poor coverage of the available bits.
If you need a shorter value, take the modulus by a prime. Don’t just sample the low order bits.
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