includes/clientside/static/diffiehellman.js
author Dan
Sat, 26 Apr 2008 17:25:28 -0400
changeset 540 1e4b759da336
parent 436 242353360e37
permissions -rw-r--r--
Added but didn't set up custom_user_title ACL; fixed rebuild_page_index() to use word_lcase
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/*
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 * The Diffie-Hellman key exchange protocol.
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 */
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// Our prime number as a base for operations.
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var dh_prime = '82818079787776757473727170696867666564636261605958575655545352515049484746454443424140393837363534333231302928272625242322212019181716151413121110987654321';
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// g, a primitive root used as an exponent
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// (2 and 5 are acceptable, but BigInt is faster with odd numbers)
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var dh_g = '5';
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/**
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 * Generates a Diffie-Hellman private key
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 * @return string(BigInt)
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 */
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function dh_gen_private()
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{
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  return EnanoMath.RandomInt(256);
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}
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/**
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 * Calculates the public key from the private key
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 * @param string(BigInt)
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 * @return string(BigInt)
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 */
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function dh_gen_public(b)
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{
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  return EnanoMath.PowMod(dh_g, b, dh_prime);
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}
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/**
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 * Calculates the shared secret.
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 * @param string(BigInt) Our private key
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 * @param string(BigInt) Remote party's public key
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 * @return string(BigInt)
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 */
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function dh_gen_shared_secret(b, A)
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{
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  return EnanoMath.PowMod(A, b, dh_prime);
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}
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