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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5 to JDK 1.8.
package org.bouncycastle.jcajce.provider.asymmetric.dh;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.math.BigInteger;
import java.util.Enumeration;
import javax.crypto.interfaces.DHPrivateKey;
import javax.crypto.spec.DHParameterSpec;
import javax.crypto.spec.DHPrivateKeySpec;
import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1Encoding;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.pkcs.DHParameter;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.asn1.pkcs.PrivateKeyInfo;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.asn1.x9.DomainParameters;
import org.bouncycastle.asn1.x9.ValidationParams;
import org.bouncycastle.asn1.x9.X9ObjectIdentifiers;
import org.bouncycastle.crypto.params.DHParameters;
import org.bouncycastle.crypto.params.DHPrivateKeyParameters;
import org.bouncycastle.crypto.params.DHValidationParameters;
import org.bouncycastle.jcajce.provider.asymmetric.util.PKCS12BagAttributeCarrierImpl;
import org.bouncycastle.jcajce.spec.DHDomainParameterSpec;
import org.bouncycastle.jcajce.spec.DHExtendedPrivateKeySpec;
import org.bouncycastle.jce.interfaces.PKCS12BagAttributeCarrier;
public class BCDHPrivateKey
implements DHPrivateKey, PKCS12BagAttributeCarrier
{
static final long serialVersionUID = 311058815616901812L;
private BigInteger x;
private transient DHParameterSpec dhSpec;
private transient PrivateKeyInfo info;
private transient DHPrivateKeyParameters dhPrivateKey;
private transient PKCS12BagAttributeCarrierImpl attrCarrier = new PKCS12BagAttributeCarrierImpl();
protected BCDHPrivateKey()
{
}
BCDHPrivateKey(
DHPrivateKey key)
{
this.x = key.getX();
this.dhSpec = key.getParams();
}
BCDHPrivateKey(
DHPrivateKeySpec spec)
{
this.x = spec.getX();
if (spec instanceof DHExtendedPrivateKeySpec)
{
this.dhSpec = ((DHExtendedPrivateKeySpec)spec).getParams();
}
else
{
this.dhSpec = new DHParameterSpec(spec.getP(), spec.getG());
}
}
public BCDHPrivateKey(
PrivateKeyInfo info)
throws IOException
{
ASN1Sequence seq = ASN1Sequence.getInstance(info.getPrivateKeyAlgorithm().getParameters());
ASN1Integer derX = (ASN1Integer)info.parsePrivateKey();
ASN1ObjectIdentifier id = info.getPrivateKeyAlgorithm().getAlgorithm();
this.info = info;
this.x = derX.getValue();
if (id.equals(PKCSObjectIdentifiers.dhKeyAgreement))
{
DHParameter params = DHParameter.getInstance(seq);
if (params.getL() != null)
{
this.dhSpec = new DHParameterSpec(params.getP(), params.getG(), params.getL().intValue());
this.dhPrivateKey = new DHPrivateKeyParameters(x,
new DHParameters(params.getP(), params.getG(), null, params.getL().intValue()));
}
else
{
this.dhSpec = new DHParameterSpec(params.getP(), params.getG());
this.dhPrivateKey = new DHPrivateKeyParameters(x,
new DHParameters(params.getP(), params.getG()));
}
}
else if (id.equals(X9ObjectIdentifiers.dhpublicnumber))
{
DomainParameters params = DomainParameters.getInstance(seq);
this.dhSpec = new DHDomainParameterSpec(params.getP(), params.getQ(), params.getG(), params.getJ(), 0);
this.dhPrivateKey = new DHPrivateKeyParameters(x,
new DHParameters(params.getP(), params.getG(), params.getQ(), params.getJ(), null));
}
else
{
throw new IllegalArgumentException("unknown algorithm type: " + id);
}
}
BCDHPrivateKey(
DHPrivateKeyParameters params)
{
this.x = params.getX();
this.dhSpec = new DHDomainParameterSpec(params.getParameters());
}
public String getAlgorithm()
{
return "DH";
}
/**
* return the encoding format we produce in getEncoded().
*
* @return the string "PKCS#8"
*/
public String getFormat()
{
return "PKCS#8";
}
/**
* Return a PKCS8 representation of the key. The sequence returned
* represents a full PrivateKeyInfo object.
*
* @return a PKCS8 representation of the key.
*/
public byte[] getEncoded()
{
try
{
if (info != null)
{
return info.getEncoded(ASN1Encoding.DER);
}
PrivateKeyInfo info;
if (dhSpec instanceof DHDomainParameterSpec && ((DHDomainParameterSpec)dhSpec).getQ() != null)
{
DHParameters params = ((DHDomainParameterSpec)dhSpec).getDomainParameters();
DHValidationParameters validationParameters = params.getValidationParameters();
ValidationParams vParams = null;
if (validationParameters != null)
{
vParams = new ValidationParams(validationParameters.getSeed(), validationParameters.getCounter());
}
info = new PrivateKeyInfo(new AlgorithmIdentifier(X9ObjectIdentifiers.dhpublicnumber, new DomainParameters(params.getP(), params.getG(), params.getQ(), params.getJ(), vParams).toASN1Primitive()), new ASN1Integer(getX()));
}
else
{
info = new PrivateKeyInfo(new AlgorithmIdentifier(PKCSObjectIdentifiers.dhKeyAgreement, new DHParameter(dhSpec.getP(), dhSpec.getG(), dhSpec.getL()).toASN1Primitive()), new ASN1Integer(getX()));
}
return info.getEncoded(ASN1Encoding.DER);
}
catch (Exception e)
{
return null;
}
}
public String toString()
{
return DHUtil.privateKeyToString("DH", x, new DHParameters(dhSpec.getP(), dhSpec.getG()));
}
public DHParameterSpec getParams()
{
return dhSpec;
}
public BigInteger getX()
{
return x;
}
DHPrivateKeyParameters engineGetKeyParameters()
{
if (dhPrivateKey != null)
{
return dhPrivateKey;
}
if (dhSpec instanceof DHDomainParameterSpec)
{
return new DHPrivateKeyParameters(x, ((DHDomainParameterSpec)dhSpec).getDomainParameters());
}
return new DHPrivateKeyParameters(x, new DHParameters(dhSpec.getP(), dhSpec.getG(), null, dhSpec.getL()));
}
public boolean equals(
Object o)
{
if (!(o instanceof DHPrivateKey))
{
return false;
}
DHPrivateKey other = (DHPrivateKey)o;
return this.getX().equals(other.getX())
&& this.getParams().getG().equals(other.getParams().getG())
&& this.getParams().getP().equals(other.getParams().getP())
&& this.getParams().getL() == other.getParams().getL();
}
public int hashCode()
{
return this.getX().hashCode() ^ this.getParams().getG().hashCode()
^ this.getParams().getP().hashCode() ^ this.getParams().getL();
}
public void setBagAttribute(
ASN1ObjectIdentifier oid,
ASN1Encodable attribute)
{
attrCarrier.setBagAttribute(oid, attribute);
}
public ASN1Encodable getBagAttribute(
ASN1ObjectIdentifier oid)
{
return attrCarrier.getBagAttribute(oid);
}
public Enumeration getBagAttributeKeys()
{
return attrCarrier.getBagAttributeKeys();
}
private void readObject(
ObjectInputStream in)
throws IOException, ClassNotFoundException
{
in.defaultReadObject();
this.dhSpec = new DHParameterSpec((BigInteger)in.readObject(), (BigInteger)in.readObject(), in.readInt());
this.info = null;
this.attrCarrier = new PKCS12BagAttributeCarrierImpl();
}
private void writeObject(
ObjectOutputStream out)
throws IOException
{
out.defaultWriteObject();
out.writeObject(dhSpec.getP());
out.writeObject(dhSpec.getG());
out.writeInt(dhSpec.getL());
}
}