?? jcedhpublickey.java
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package org.bouncycastle.jce.provider;import java.io.ByteArrayOutputStream;import java.io.IOException;import java.io.ObjectInputStream;import java.io.ObjectOutputStream;import java.math.BigInteger;import javax.crypto.interfaces.DHPublicKey;import javax.crypto.spec.DHParameterSpec;import javax.crypto.spec.DHPublicKeySpec;import org.bouncycastle.asn1.ASN1Sequence;import org.bouncycastle.asn1.DERInteger;import org.bouncycastle.asn1.DEROutputStream;import org.bouncycastle.asn1.pkcs.DHParameter;import org.bouncycastle.asn1.x509.AlgorithmIdentifier;import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo;import org.bouncycastle.asn1.x9.X9ObjectIdentifiers;import org.bouncycastle.crypto.params.DHPublicKeyParameters;public class JCEDHPublicKey implements DHPublicKey{ private BigInteger y; private DHParameterSpec dhSpec; JCEDHPublicKey( DHPublicKeySpec spec) { this.y = spec.getY(); this.dhSpec = new DHParameterSpec(spec.getP(), spec.getG()); } JCEDHPublicKey( DHPublicKey key) { this.y = key.getY(); this.dhSpec = key.getParams(); } JCEDHPublicKey( DHPublicKeyParameters params) { this.y = params.getY(); this.dhSpec = new DHParameterSpec(params.getParameters().getP(), params.getParameters().getG(), 0); } JCEDHPublicKey( BigInteger y, DHParameterSpec dhSpec) { this.y = y; this.dhSpec = dhSpec; } JCEDHPublicKey( SubjectPublicKeyInfo info) { DHParameter params = new DHParameter((ASN1Sequence)info.getAlgorithmId().getParameters()); DERInteger derY = null; try { derY = (DERInteger)info.getPublicKey(); } catch (IOException e) { throw new IllegalArgumentException("invalid info structure in DH public key"); } this.y = derY.getValue(); if (params.getL() != null) { this.dhSpec = new DHParameterSpec(params.getP(), params.getG(), params.getL().intValue()); } else { this.dhSpec = new DHParameterSpec(params.getP(), params.getG()); } } public String getAlgorithm() { return "DH"; } public String getFormat() { return "X.509"; } public byte[] getEncoded() { SubjectPublicKeyInfo info = new SubjectPublicKeyInfo(new AlgorithmIdentifier(X9ObjectIdentifiers.dhpublicnumber, new DHParameter(dhSpec.getP(), dhSpec.getG(), dhSpec.getL()).getDERObject()), new DERInteger(y)); return info.getDEREncoded(); } public DHParameterSpec getParams() { return dhSpec; } public BigInteger getY() { return y; } private void readObject( ObjectInputStream in) throws IOException, ClassNotFoundException { this.y = (BigInteger)in.readObject(); this.dhSpec = new DHParameterSpec((BigInteger)in.readObject(), (BigInteger)in.readObject(), in.readInt()); } private void writeObject( ObjectOutputStream out) throws IOException { out.writeObject(this.getY()); out.writeObject(dhSpec.getP()); out.writeObject(dhSpec.getG()); out.writeInt(dhSpec.getL()); }}
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