pmakkeys-1.1.0.zip (info) a zipped hfs disk image and checksum file. The disk image can be mounted with Mini vMac. Includes source code.
PMakKeys is a tool to make secret and public key pairs for use in writing and verifying digital signatures, just like MakeKeys, except that it uses a different format that is more or less compatible with the program MacPGP.
The tools PSgWrite and PSgCheck use the keys generated by PMakKeys.
PMakKeys is in part descended from MacPGP source code, which, as far as I can tell, allows derived works for noncommercial use. PMakKeys is generally compatible with MacPGP, but it is easier to legally distribute, since it doesn’t do cryptography. Since it only does one thing it should also be easier to use.
PMakKeys generates keys compatibile with MacPGP, but it does not encrypt the secret key. Another difference with MacPGP is that PMakKeys sets the user name field to "anon", rather than asking for one.
See the Compiling page for instructions on compiling PMakKeys from the source code.
If you find PMakKeys useful, please consider helping the Gryphel Project, of which it is a part.