PGPTOOLS and Magic Money

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I've got the code written to check the whole coin, and I found another
subtle bug caused by precision setting. Since setting precision does not
seem to affect the speed of the decryption (I think the mpi library sets
it internally during modexp) I'm just going to fix it at MAX_UNIT_PRECISION
and leave it there. Tomorrow I will strip out all of these damn things.

                                           Pr0duct Cypher


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PC> 
> I've got the code written to check the whole coin, and I found another
> subtle bug caused by precision setting. Since setting precision does not
> seem to affect the speed of the decryption (I think the mpi library sets
> it internally during modexp) I'm just going to fix it at MAX_UNIT_PRECISION
> and leave it there. Tomorrow I will strip out all of these damn things.

Yea, MPI lets the precision.  This is not a bug -- the MPI library
needs to know how big the number is.  (The bug is that its done in a
global variable and not as a part of the number internally, but thats
a different matter).  The reason it needs to know is so that it
doesn't need to perform large operations for small numebers.  For
example, there is no reason to perform a 1024-bit modexp when you are
dealing with 384-bit numbers!

FYI: I have both big-endian and little-endian machines at my disposal.
Also, I was having problems building PGP Tools under mips-ultrix --
you have some global variables in ptd that you expect from time.h
which don't exist.  In particular, timezone and daylight.

-derek

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