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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 1.4.
package org.bouncycastle.jcajce.provider.asymmetric.ec;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.math.BigInteger;
import java.util.Enumeration;
import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1Encoding;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.DERBitString;
import org.bouncycastle.asn1.DERNull;
import org.bouncycastle.asn1.DEROutputStream;
import org.bouncycastle.asn1.cryptopro.CryptoProObjectIdentifiers;
import org.bouncycastle.asn1.pkcs.PrivateKeyInfo;
import org.bouncycastle.asn1.sec.ECPrivateKeyStructure;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo;
import org.bouncycastle.asn1.x9.X962Parameters;
import org.bouncycastle.asn1.x9.X9ECParameters;
import org.bouncycastle.asn1.x9.X9ObjectIdentifiers;
import org.bouncycastle.crypto.params.ECDomainParameters;
import org.bouncycastle.crypto.params.ECPrivateKeyParameters;
import org.bouncycastle.jcajce.provider.asymmetric.util.ECUtil;
import org.bouncycastle.jcajce.provider.asymmetric.util.KeyUtil;
import org.bouncycastle.jcajce.provider.asymmetric.util.PKCS12BagAttributeCarrierImpl;
import org.bouncycastle.jcajce.provider.config.ProviderConfiguration;
import org.bouncycastle.jce.interfaces.ECPointEncoder;
import org.bouncycastle.jce.interfaces.ECPrivateKey;
import org.bouncycastle.jce.interfaces.PKCS12BagAttributeCarrier;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.jce.spec.ECNamedCurveParameterSpec;
import org.bouncycastle.jce.spec.ECParameterSpec;
import org.bouncycastle.jce.spec.ECPrivateKeySpec;
import org.bouncycastle.math.ec.ECCurve;
import org.bouncycastle.math.ec.ECPoint;
import org.bouncycastle.util.Strings;
public class BCECPrivateKey
implements ECPrivateKey, PKCS12BagAttributeCarrier, ECPointEncoder
{
private String algorithm = "EC";
private boolean withCompression;
private transient BigInteger d;
private transient ECParameterSpec ecSpec;
private transient ProviderConfiguration configuration;
private transient DERBitString publicKey;
private transient PKCS12BagAttributeCarrierImpl attrCarrier = new PKCS12BagAttributeCarrierImpl();
protected BCECPrivateKey()
{
}
BCECPrivateKey(
ECPrivateKey key,
ProviderConfiguration configuration)
{
this.d = key.getD();
this.algorithm = key.getAlgorithm();
this.ecSpec = key.getParameters();
this.configuration = configuration;
}
public BCECPrivateKey(
String algorithm,
ECPrivateKeySpec spec,
ProviderConfiguration configuration)
{
this.algorithm = algorithm;
this.d = spec.getD();
this.ecSpec = spec.getParams();
this.configuration = configuration;
}
public BCECPrivateKey(
String algorithm,
ECPrivateKeyParameters params,
BCECPublicKey pubKey,
ECParameterSpec spec,
ProviderConfiguration configuration)
{
ECDomainParameters dp = params.getParameters();
this.algorithm = algorithm;
this.d = params.getD();
this.configuration = configuration;
if (spec == null)
{
this.ecSpec = new ECParameterSpec(
dp.getCurve(),
dp.getG(),
dp.getN(),
dp.getH(),
dp.getSeed());
}
else
{
this.ecSpec = spec;
}
publicKey = getPublicKeyDetails(pubKey);
}
public BCECPrivateKey(
String algorithm,
ECPrivateKeyParameters params,
ProviderConfiguration configuration)
{
this.algorithm = algorithm;
this.d = params.getD();
this.ecSpec = null;
this.configuration = configuration;
}
public BCECPrivateKey(
String algorithm,
BCECPrivateKey key)
{
this.algorithm = algorithm;
this.d = key.d;
this.ecSpec = key.ecSpec;
this.withCompression = key.withCompression;
this.publicKey = key.publicKey;
this.attrCarrier = key.attrCarrier;
this.configuration = key.configuration;
}
BCECPrivateKey(
PrivateKeyInfo info,
ProviderConfiguration configuration)
{
this.configuration = configuration;
populateFromPrivKeyInfo(info);
}
BCECPrivateKey(
String algorithm,
PrivateKeyInfo info,
ProviderConfiguration configuration)
{
this.configuration = configuration;
populateFromPrivKeyInfo(info);
this.algorithm = algorithm;
}
private void populateFromPrivKeyInfo(PrivateKeyInfo info)
{
X962Parameters params = X962Parameters.getInstance(info.getAlgorithmId().getParameters());
if (params.isNamedCurve())
{
ASN1ObjectIdentifier oid = (ASN1ObjectIdentifier)params.getParameters();
X9ECParameters ecP = ECUtil.getNamedCurveByOid(oid);
ecSpec = new ECNamedCurveParameterSpec(
ECUtil.getCurveName(oid),
ecP.getCurve(),
ecP.getG(),
ecP.getN(),
ecP.getH(),
ecP.getSeed());
}
else if (params.isImplicitlyCA())
{
ecSpec = null;
}
else
{
X9ECParameters ecP = X9ECParameters.getInstance(params.getParameters());
ecSpec = new ECParameterSpec(ecP.getCurve(),
ecP.getG(),
ecP.getN(),
ecP.getH(),
ecP.getSeed());
}
if (info.getPrivateKey() instanceof ASN1Integer)
{
ASN1Integer derD = ASN1Integer.getInstance(info.getPrivateKey());
this.d = derD.getValue();
}
else
{
ECPrivateKeyStructure ec = new ECPrivateKeyStructure((ASN1Sequence)info.getPrivateKey());
this.d = ec.getKey();
this.publicKey = ec.getPublicKey();
}
}
public String getAlgorithm()
{
return algorithm;
}
/**
* 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()
{
X962Parameters params = ECUtils.getDomainParametersFromName(ecSpec, withCompression);
int orderBitLength;
if (ecSpec == null)
{
orderBitLength = ECUtil.getOrderBitLength(configuration, null, this.getD());
}
else
{
orderBitLength = ECUtil.getOrderBitLength(configuration, ecSpec.getN(), this.getD());
}
PrivateKeyInfo info;
org.bouncycastle.asn1.sec.ECPrivateKey keyStructure;
if (publicKey != null)
{
keyStructure = new org.bouncycastle.asn1.sec.ECPrivateKey(orderBitLength, this.getD(), publicKey, params);
}
else
{
keyStructure = new org.bouncycastle.asn1.sec.ECPrivateKey(orderBitLength, this.getD(), params);
}
try
{
info = new PrivateKeyInfo(new AlgorithmIdentifier(X9ObjectIdentifiers.id_ecPublicKey, params), keyStructure);
return info.getEncoded(ASN1Encoding.DER);
}
catch (IOException e)
{
return null;
}
}
public ECParameterSpec getParams()
{
return (ECParameterSpec)ecSpec;
}
public ECParameterSpec getParameters()
{
return (ECParameterSpec)ecSpec;
}
public BigInteger getD()
{
return d;
}
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();
}
public void setPointFormat(String style)
{
withCompression = !("UNCOMPRESSED".equalsIgnoreCase(style));
}
ECParameterSpec engineGetSpec()
{
if (ecSpec != null)
{
return ecSpec;
}
return BouncyCastleProvider.CONFIGURATION.getEcImplicitlyCa();
}
public boolean equals(Object o)
{
if (!(o instanceof BCECPrivateKey))
{
return false;
}
BCECPrivateKey other = (BCECPrivateKey)o;
return getD().equals(other.getD()) && (engineGetSpec().equals(other.engineGetSpec()));
}
public int hashCode()
{
return getD().hashCode() ^ engineGetSpec().hashCode();
}
private DERBitString getPublicKeyDetails(BCECPublicKey pub)
{
try
{
SubjectPublicKeyInfo info = SubjectPublicKeyInfo.getInstance(ASN1Primitive.fromByteArray(pub.getEncoded()));
return info.getPublicKeyData();
}
catch (IOException e)
{ // should never happen
return null;
}
}
private void readObject(
ObjectInputStream in)
throws IOException, ClassNotFoundException
{
in.defaultReadObject();
byte[] enc = (byte[])in.readObject();
populateFromPrivKeyInfo(PrivateKeyInfo.getInstance(ASN1Primitive.fromByteArray(enc)));
this.configuration = BouncyCastleProvider.CONFIGURATION;
this.attrCarrier = new PKCS12BagAttributeCarrierImpl();
}
private void writeObject(
ObjectOutputStream out)
throws IOException
{
out.defaultWriteObject();
out.writeObject(this.getEncoded());
}
}
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