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This is a version of PGP 2.6.2i suitable for use on Acorn's RISC OS machines
such as the Archimedes, A3000 and Risc PC.

This distribution does include source code, but does NOT include
things necessary only for compiling PGP on other platforms. If you
want that, you should get the original distribution, for which the
nearest FTP site to you is probably ftp.ox.ac.uk .
(All the source files that are here should still be usable on other
systems, though; it's just that some of the extra files needed for
them aren't here any more.)

I should make it clear that I didn't write this; I just ported it.
The only substantial bits of my code are the ARM-specific arithmetic,
MD5 and low-level IO calls.

I haven't made any attempt to port stuff in the "contrib" directory,
because I never use it. It looks like it should be pretty easy -- just
a matter of the usual filename fiddling.


For general information about PGP, read "readme/1st" first, and then
look in the "doc" directory. All this stuff is from the standard
PGP 2.6.2i distribution.

For more information about the RISC OS version than is in this file,
see !Hints. In particular there's information about installing PGP
there.


What's different in the RISC OS version?
 - Lots of filename-handling changes. I think I've caught
   everything.
 - ARM code for various things that need it or benefit from it.
 - different filenames for various things, of course.

For more information about this, see the file !Changes, which
details every change I've made to the original distribution
with the exception of "automatic" filename changes (things like
foo.c -> c.foo).


Potential gotchas:
 - You must use RISC OS filenames; PGP will not translate, say,
   /foo/bar.c into $.foo.c.bar for you.
 - Filename extensions are *not* converted into directories;
   if you want "foo.bar/asc" to mean "foo.asc.bar" or something
   then you'll have to edit the source code yourself.
 - Filename extensions must be given in lowercase. Sorry. (It
   doesn't matter what case the filename on disc has; just what
   you feed to PGP yourself.)
 - Several filenames have changed non-trivially; e.g., pubring.pgp
   has become pubrng.pgp (note missing "i").


Checking you've got a valid copy:
 - The file "pgp/asc" contains a detached signature for the "pgp" binary,
   signed by me.
 - The file "key/asc" contains my PGP key.
 - You can sort-of verify that it's my key by checking against a copy
   from a keyserver.
 - Of course, some malicious person *could* be impersonating me cleverly.
   If you're worried about that, you probably have ideas about how to
   become less worried.


    -- Gareth McCaughan
       gjm11@pmms.cam.ac.uk


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