author | Dan |
Mon, 12 May 2008 00:59:46 -0400 | |
changeset 554 | e87390b1f9b0 |
parent 436 | 242353360e37 |
permissions | -rw-r--r-- |
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Added support for Diffie-Hellman key exchange during login. w00t!
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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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