According to my tests, the change was a success. This ticket is now resolved (remains for others to check that the tests go through for them as well).
[levitte - Mon Dec 23 10:28:27 2002]: > For VAX/VMS people: I think I found a solution. Shifting down the > dividend down one more step seems to be it (or at least it avoids > getting the temporary quotient 0x80000000, which is what is needed > to get EDIV to accept the result as valid). However, it also means > having a 33 bit shifted up quotient for a moment, until the last part > of the algorithm does it's arithmetics on the (in all tests I've > done) too large remainder (and therefore the quotient as well). > > I'll do some tests, and commit as soon as this is verified. > > [[EMAIL PROTECTED] - Fri Dec 20 16:46:22 2002]: > > > The problem is when an EDIV will produce a negative quotient from the > > division of two positive numbers. An example is the following call: > > > > q = bn_div_words(0xC0171716, 0xFFFFAB9A, 0xC0171717); > > > > q is supposed to get the result 0xFFFFFFFF. Unfortunately, the way > > the numbers are handled to avoid negative numbers (I've been bending > > backwards to get that to work), EDIV is asked to perform the following > > operation: > > > > 3005C5C5BFFFEAE6 / 600B8B8B > > > > The result of such an operation is 80000000, which is a negative > > number according to EDIV, and since that's the result of dividing two > > positive numbers, this is an integer overflow, and the result becomes > > incorrect. > > > > For the arguments (n0, n1, d) to bn_div_words(), I've found out that > > the problem occurs under the following condition: > > > > ((n0 & 0x80000000) && (d & 0x80000000) > > && (d >> 2) <= (n0 >> 2) && (d >= 0x80000000)) > > > > I'm trying to find a method to handle this case, currently involving > > subtracting 0x80000000 from n0 and trying to adjust the result > > accordingly, but I haven't come very far. > > > > This is a showstopper on VAX. > -- Richard Levitte ______________________________________________________________________ OpenSSL Project http://www.openssl.org Development Mailing List [EMAIL PROTECTED] Automated List Manager [EMAIL PROTECTED]
