An arbitrary precision integer math library (also known as bignums) implemented in pure Tcl under the BSD license can be found at http://wiki.hping.org/108.
Hopefully it will be available in [Tcllib] in short time. In this page you can also find usage examples about [RSA] and [Diffie-Hellman Key Agreement Protocol].

See also [math::bignum]

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Note that Tcl 8.5 includes extensive [bignum] support.

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