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Pr0duct Cypher Warlord
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 maximum 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!
The bug was in my code, not in mpilib, but the need to set precision can be a real pain. I've been plagued by intermittent bugs caused by mpis not being completely cleared or fully calculated out. Since modexp does it automatically, I'm just going to set it to max. If you or someone else with both types of machines wants to fix that, feel free. I don't have the means to do so, and it's been my experience that writing code you can't test is a waste of time.
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.
PTD is a kludge. There are no similar dependencies in the library itself. PTD was just written as needed to test the rest of the library, and was not intended to be a usable application. You can either put in #ifdefs for your machine, or set up another module with the needed globals. I just wanted to code around the need for timezone stuff and get the test code working. I've got another version of PGP Tools ready which removes most of the set_precision stuff, and a version of Magic Money which checks the whole coin when it receives it. There are a few more changes for Magic Money, but I should be mailing out soon. Someone wrote that they had success with a big-endian machine - whew! and thanks for testing it. Pr0duct Cypher -----BEGIN PGP SIGNATURE----- Version: 2.3a iQCVAgUBLVcQUsGoFIWXVYodAQEiQQP/Tsm/AIi+zNJ5YIzPfaEjzeSyyi4pwLTp ZYzo88FyBBrayFpt+CkSdlatnOVu7EwyHcNBgh8Z3LJeffOcI8Wiw9WPO9v0vqHj yE35Yq9rFfBnTjQuZ3uNnb03l1G0XfyG2AyuYer3Y4shEKwO/6DgYr4b5K9Y2Wqc p8qpWGwUC6I= =itBc -----END PGP SIGNATURE-----