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gnu.javax.net.ssl.provider
Class DiffieHellman  

java.lang.Object
  gnu.javax.net.ssl.provider.DiffieHellman

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final class DiffieHellman

extends java.lang.Object

Simple implementation of two-party Diffie-Hellman key agreement.

The primes used in this class are from the following documents:

• D. Harkins and D. Carrel, "The Internet Key Exchange (IKE)", RFC 2409.
• T. Kivinen and M. Kojo, "More Modular Exponential (MODP) Diffie-Hellman groups for Internet Key Exchange (IKE)", RFC 3526.

The generator for all these primes is 2.

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Field Summary
(package private) static java.math.BigInteger	DH_G           The generator for all Diffie Hellman groups below.
(package private) static java.math.BigInteger	GROUP_1           p = 2^768 - 2 ^704 - 1 + 2^64 * { [2^638 pi] + 149686 }
(package private) static java.math.BigInteger	GROUP_14           p = 2^2048 - 2^1984 - 1 + 2^64 * { [2^1918 pi] + 124476 }.
(package private) static java.math.BigInteger	GROUP_15           p = 2^3072 - 2^3008 - 1 + 2^64 * { [2^2942 pi] + 1690314 }.
(package private) static java.math.BigInteger	GROUP_16           p = 2^4096 - 2^4032 - 1 + 2^64 * { [2^3966 pi] + 240904 }.
(package private) static java.math.BigInteger	GROUP_17
(package private) static java.math.BigInteger	GROUP_18           p = 2^8192 - 2^8128 - 1 + 2^64 * { [2^8062 pi] + 4743158 }.
(package private) static java.math.BigInteger	GROUP_2           p = 2^1024 - 2^960 - 1 + 2^64 * { [2^894 pi] + 129093 }
(package private) static java.math.BigInteger	GROUP_5           This prime p = 2^1536 - 2^1472 - 1 + 2^64 * { [2^1406 pi] + 741804 }.

 

Constructor Summary
(package private)	DiffieHellman()

 

Method Summary
(package private) static gnu.javax.crypto.key.dh.GnuDHPrivateKey	getParams()           Get the system's Diffie-Hellman parameters, in which g is 2 and p is determined by the property "jessie.keypool.dh.group".

 

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

 

Field Detail

DH_G

static final java.math.BigInteger DH_G

The generator for all Diffie Hellman groups below.

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GROUP_1

static final java.math.BigInteger GROUP_1

p = 2^768 - 2 ^704 - 1 + 2^64 * { [2^638 pi] + 149686 }

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GROUP_2

static final java.math.BigInteger GROUP_2

p = 2^1024 - 2^960 - 1 + 2^64 * { [2^894 pi] + 129093 }

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GROUP_5

static final java.math.BigInteger GROUP_5

This prime p = 2^1536 - 2^1472 - 1 + 2^64 * { [2^1406 pi] + 741804 }.

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GROUP_14

static final java.math.BigInteger GROUP_14

p = 2^2048 - 2^1984 - 1 + 2^64 * { [2^1918 pi] + 124476 }.

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GROUP_15

static final java.math.BigInteger GROUP_15

p = 2^3072 - 2^3008 - 1 + 2^64 * { [2^2942 pi] + 1690314 }.

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GROUP_16

static final java.math.BigInteger GROUP_16

p = 2^4096 - 2^4032 - 1 + 2^64 * { [2^3966 pi] + 240904 }.

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GROUP_17

static final java.math.BigInteger GROUP_17

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GROUP_18

static final java.math.BigInteger GROUP_18

p = 2^8192 - 2^8128 - 1 + 2^64 * { [2^8062 pi] + 4743158 }.

This value, while quite large, is estimated to provide the equivalent cryptographic strength of a symmetric key between 190 and 320 bits.

Constructor Detail

DiffieHellman

DiffieHellman()

Method Detail

getParams

static gnu.javax.crypto.key.dh.GnuDHPrivateKey getParams()

Get the system's Diffie-Hellman parameters, in which g is 2 and p is determined by the property "jessie.keypool.dh.group". The default value for p is 18, corresponding to GROUP_18 55 .

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