[GNU Crypto] improvement to Prime

[Raif S. Naffah]

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hello there,

i'd like to add a small improvement to the gnu.crypto.util.Prime class 
in order to speed up primality testing.

the proposed change is based on adding a private singleton WeakHashMap 
instance, where previously successfully tested MPIs are stored.  before 
applying the primality tests, that map would be consulted and only if 
it does not contain the designated MPI, would the tests be carried out.

comments?


cheers;
rsn
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