41 lines
1.1 KiB
C#
41 lines
1.1 KiB
C#
using System;
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using Org.BouncyCastle.Crypto.Parameters;
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using Org.BouncyCastle.Math;
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namespace Org.BouncyCastle.Crypto.Generators
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{
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/**
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* a basic Diffie-Helman key pair generator.
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*
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* This Generates keys consistent for use with the basic algorithm for
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* Diffie-Helman.
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*/
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public class DHBasicKeyPairGenerator
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: IAsymmetricCipherKeyPairGenerator
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{
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private DHKeyGenerationParameters param;
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public virtual void Init(
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KeyGenerationParameters parameters)
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{
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this.param = (DHKeyGenerationParameters) parameters;
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}
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public virtual AsymmetricCipherKeyPair GenerateKeyPair()
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{
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DHKeyGeneratorHelper helper = DHKeyGeneratorHelper.Instance;
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DHParameters dhParams = param.Parameters;
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BigInteger p = dhParams.P;
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BigInteger x = helper.CalculatePrivate(p, param.Random, dhParams.L);
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BigInteger y = helper.CalculatePublic(p, dhParams.G, x);
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return new AsymmetricCipherKeyPair(
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new DHPublicKeyParameters(y, dhParams),
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new DHPrivateKeyParameters(x, dhParams));
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}
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}
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}
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