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DiffieHellman: http://www.soa-world.de/echelon/2010/09/diffie-hellman-key-exchange-in-javascript.html
BigInt (for RSA): http://leemon.com/crypto/BigInt.html, http://leemon.com/crypto/BigInt.js
RC4: https://gist.github.com/2185197
Buncha stuff: https://github.com/mozilla/jwcrypto/tree/master/libs/external