Short:    _FAST_ 68060 patcher for PGP2.6.3i
Author:   roragusa@freenet.hut.fi (Roberto Ragusa)
Uploader: roragusa@freenet.hut.fi (Roberto Ragusa)
Version:  1.0
Type:     util/crypt
Requires: PGP 2.6.3is

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THIS PROGRAM IS ONLY A PATCHER. IT DOESN'T CONTAIN ANY CRYPTO CODE.
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This is a small patcher that makes PGP a lot faster, and is only useful on
68060 processor.

The patch will make PGP executable (68020 version) 100 bytes bigger (but
more than 2 times faster!). If used on 020/030/040 CPUs the patched version
is probably a little slower (I didn't test that...), but it should work
without problems.

Technically: the critical loop of the calculations has been rewritten
without 32x32->64 mulu.l, thus avoiding missing instruction emulation
and multitasking suspension (jumping mouse).

A little test (encrypt/sign and decrypt of the PGP executable itself):
unpatched 8.64s and 8.00s, patched 4.32s and 3.77s (!!!).

I extensively tested the perfect working of the 060 PGP, so I'm pretty sure
it hasn't got any bug.

WARNING: if you are using the original PGP executable with CyberPatcher
and/or OxyPatcher, you could have some speed increase, but also spurious
errors due to inaccurate emulation of the mulu.l instruction. Technically:
the emulation routine does not preserve the X flag, but PGP does need that
the X flag isn't changed. No problems with the patched version (because no
mulu.l are emulated anymore and the rewritten loop takes care of X flag!).

If you don't trust this patch (you think it's a virus/backdoor...), just
either don't use it and continue to have that "jumping mouse", or
disassemble the changed code and check it on your own.

If you want to try it, use a command like this:
  PatchPGPfor060 c:PGP ram:PGP060
Then rename c:PGP to c:PGP.slow and copy ram:PGP060 to c:PGP.

Enjoy the speed!
Send me an Email, if you think this patcher is useful :-) .


============================= Archive contents =============================

Original  Packed Ratio    Date     Time    Name
-------- ------- ----- --------- --------  -------------
    9104    5948 34.6% 17-Feb-98 22:05:28 +PatchPGPfor060
    2022    1038 48.6% 20-Feb-98 18:24:40 +PGP_060patch.readme
-------- ------- ----- --------- --------
   11126    6986 37.2% 21-Feb-98 13:20:56   2 files
