what happened to Python Cryptography Toolkit?

[Peter Wang]

i find quite a few references to Andrew Kuchling's Python Cryptography
Toolkit on the web, but all the links to actual sources/distributions
are broken.  also, there doesn't seem to be any mention of it past
1995...

has it been supplanted by something else?  all i want is to easily do
RSA, preferrably in a platform-independent manner. (if platform
dependence is unavoidable, unix is preferable.)

TIA,
peter