| package org.bouncycastle.jce.provider; |
| |
| 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.DERObjectIdentifier; |
| import org.bouncycastle.asn1.pkcs.DHParameter; |
| import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers; |
| import org.bouncycastle.asn1.x509.AlgorithmIdentifier; |
| import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo; |
| import org.bouncycastle.asn1.x9.DHDomainParameters; |
| import org.bouncycastle.asn1.x9.X9ObjectIdentifiers; |
| import org.bouncycastle.crypto.params.DHPublicKeyParameters; |
| |
| public class JCEDHPublicKey |
| implements DHPublicKey |
| { |
| static final long serialVersionUID = -216691575254424324L; |
| |
| private BigInteger y; |
| private DHParameterSpec dhSpec; |
| private SubjectPublicKeyInfo info; |
| |
| 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(), params.getParameters().getL()); |
| } |
| |
| JCEDHPublicKey( |
| BigInteger y, |
| DHParameterSpec dhSpec) |
| { |
| this.y = y; |
| this.dhSpec = dhSpec; |
| } |
| |
| JCEDHPublicKey( |
| SubjectPublicKeyInfo info) |
| { |
| this.info = info; |
| |
| DERInteger derY; |
| try |
| { |
| derY = (DERInteger)info.getPublicKey(); |
| } |
| catch (IOException e) |
| { |
| throw new IllegalArgumentException("invalid info structure in DH public key"); |
| } |
| |
| this.y = derY.getValue(); |
| |
| ASN1Sequence seq = ASN1Sequence.getInstance(info.getAlgorithmId().getParameters()); |
| DERObjectIdentifier id = info.getAlgorithmId().getObjectId(); |
| |
| // we need the PKCS check to handle older keys marked with the X9 oid. |
| if (id.equals(PKCSObjectIdentifiers.dhKeyAgreement) || isPKCSParam(seq)) |
| { |
| DHParameter params = new DHParameter(seq); |
| |
| if (params.getL() != null) |
| { |
| this.dhSpec = new DHParameterSpec(params.getP(), params.getG(), params.getL().intValue()); |
| } |
| else |
| { |
| this.dhSpec = new DHParameterSpec(params.getP(), params.getG()); |
| } |
| } |
| else if (id.equals(X9ObjectIdentifiers.dhpublicnumber)) |
| { |
| DHDomainParameters params = DHDomainParameters.getInstance(seq); |
| |
| this.dhSpec = new DHParameterSpec(params.getP().getValue(), params.getG().getValue()); |
| } |
| else |
| { |
| throw new IllegalArgumentException("unknown algorithm type: " + id); |
| } |
| } |
| |
| public String getAlgorithm() |
| { |
| return "DH"; |
| } |
| |
| public String getFormat() |
| { |
| return "X.509"; |
| } |
| |
| public byte[] getEncoded() |
| { |
| if (info != null) |
| { |
| return info.getDEREncoded(); |
| } |
| |
| SubjectPublicKeyInfo info = new SubjectPublicKeyInfo(new AlgorithmIdentifier(PKCSObjectIdentifiers.dhKeyAgreement, 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 boolean isPKCSParam(ASN1Sequence seq) |
| { |
| if (seq.size() == 2) |
| { |
| return true; |
| } |
| |
| if (seq.size() > 3) |
| { |
| return false; |
| } |
| |
| DERInteger l = DERInteger.getInstance(seq.getObjectAt(2)); |
| DERInteger p = DERInteger.getInstance(seq.getObjectAt(0)); |
| |
| if (l.getValue().compareTo(BigInteger.valueOf(p.getValue().bitLength())) > 0) |
| { |
| return false; |
| } |
| |
| return true; |
| } |
| |
| 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()); |
| } |
| } |