Re: [GNU Crypto] Bug in gnu.util.Prime.passEulerCriterion(java.math.BigInteger)

[Casey Marshall <csm@xxxxxxx>]

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>>>>> "Eric" == Eric Gilbert <ee_gilbert@xxxxxxxxx> writes:

Eric> Hello, You may already know about this one, but I figured it
Eric> would be nice to pass it on if you don't.  I am integrating the
Eric> GNU Crypto primality testing code into my own project CatCon,
Eric> http://catcon.sourceforge.net/pub/.  The method
Eric> gnu.util.Prime.passEulerCriterion(java.math.BigInteger)wrongly
Eric> identifies the following numbers as composite:

Eric> 38737 61681 65537 229153 274177

Eric> These are all of the primes less than 300000 that
Eric> passEulerCriterion incorrectly labels as composite.  There are
Eric> more, I am sure, probably having some identifying
Eric> characteristic.  Just thought you ought to know.

Looks like you're right, and no, I didn't know this. I will remove
references to passEulerCriterion in isProbablePrime, and really I
don't see any benefit to using any tests other than Miller-Rabin.

Ugh, I'm getting increasingly tired of the Prime class; I'm
considering just punting this class and using
BigInteger.isProbablePrime instead.

- -- 
Casey Marshall || csm@xxxxxxx
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