?? dhbasicagreement.java
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package org.bouncycastle.crypto.agreement;import java.math.BigInteger;import java.security.SecureRandom;import org.bouncycastle.crypto.BasicAgreement;import org.bouncycastle.crypto.CipherParameters;import org.bouncycastle.crypto.params.DHParameters;import org.bouncycastle.crypto.params.DHPublicKeyParameters;import org.bouncycastle.crypto.params.DHPrivateKeyParameters;import org.bouncycastle.crypto.params.AsymmetricKeyParameter;import org.bouncycastle.crypto.params.ParametersWithRandom;/** * a Diffie-Hellman key agreement class. * <p> * note: This is only the basic algorithm, it doesn't take advantage of * long term public keys if they are available. See the DHAgreement class * for a "better" implementation. */public class DHBasicAgreement implements BasicAgreement{ private DHPrivateKeyParameters key; private DHParameters dhParams; private SecureRandom random; public void init( CipherParameters param) { AsymmetricKeyParameter kParam; if (param instanceof ParametersWithRandom) { ParametersWithRandom rParam = (ParametersWithRandom)param; this.random = rParam.getRandom(); kParam = (AsymmetricKeyParameter)rParam.getParameters(); } else { this.random = new SecureRandom(); kParam = (AsymmetricKeyParameter)param; } if (!(kParam instanceof DHPrivateKeyParameters)) { throw new IllegalArgumentException("DHEngine expects DHPrivateKeyParameters"); } this.key = (DHPrivateKeyParameters)kParam; this.dhParams = key.getParameters(); } /** * given a short term public key from a given party calculate the next * message in the agreement sequence. */ public BigInteger calculateAgreement( CipherParameters pubKey) { DHPublicKeyParameters pub = (DHPublicKeyParameters)pubKey; if (!pub.getParameters().equals(dhParams)) { throw new IllegalArgumentException("Diffie-Hellman public key has wrong parameters."); } return pub.getY().modPow(key.getX(), dhParams.getP()); }}
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