Multi Precision Integer / Crypto libraries

More libs exist than I previously realized. Here are some:

OpenSSL – Everybody knows this one.
GNU Multiple Precision Arithmetic Library (GMP) – Big, but fast.
XySSL MPI (Bignum) source code – Very portable, pretty fast.
MPI: Arbitrary Precision Integer Arithmetic
LibTomMath
Arjen K Lenstra’s Long Integer Package
libgcrypt – based on GnuPG code

Also relevant is this page listing Free systems and libraries for doing number theory and computer algebra

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