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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.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.DERBitString;
import org.bouncycastle.asn1.DERNull;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.DEROctetString;
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.X9ECPoint;
import org.bouncycastle.asn1.x9.X9IntegerConverter;
import org.bouncycastle.asn1.x9.X9ObjectIdentifiers;
import org.bouncycastle.crypto.params.ECDomainParameters;
import org.bouncycastle.crypto.params.ECPublicKeyParameters;
import org.bouncycastle.jcajce.provider.asymmetric.util.ECUtil;
import org.bouncycastle.jcajce.provider.asymmetric.util.KeyUtil;
import org.bouncycastle.jcajce.provider.config.ProviderConfiguration;
import org.bouncycastle.jce.interfaces.ECPointEncoder;
import org.bouncycastle.jce.interfaces.ECPublicKey;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.jce.spec.ECNamedCurveParameterSpec;
import org.bouncycastle.jce.spec.ECParameterSpec;
import org.bouncycastle.jce.spec.ECPublicKeySpec;
import org.bouncycastle.math.ec.ECCurve;
import org.bouncycastle.math.ec.ECPoint;
public class BCECPublicKey
implements ECPublicKey, ECPointEncoder
{
private String algorithm = "EC";
private boolean withCompression;
private transient org.bouncycastle.math.ec.ECPoint q;
private transient ECParameterSpec ecSpec;
private transient ProviderConfiguration configuration;
public BCECPublicKey(
String algorithm,
BCECPublicKey key
)
{
this.algorithm = algorithm;
this.q = key.q;
this.ecSpec = key.ecSpec;
this.withCompression = key.withCompression;
this.configuration = key.configuration;
}
public BCECPublicKey(
String algorithm,
ECPublicKeySpec spec,
ProviderConfiguration configuration)
{
this.algorithm = algorithm;
this.q = spec.getQ();
this.configuration = configuration;
if (spec.getParams() != null)
{
this.ecSpec = spec.getParams();
}
else
{
if (q.getCurve() == null)
{
org.bouncycastle.jce.spec.ECParameterSpec s = BouncyCastleProvider.CONFIGURATION.getEcImplicitlyCa();
q = s.getCurve().createPoint(q.getX().toBigInteger(), q.getY().toBigInteger(), false);
}
this.ecSpec = null;
}
}
public BCECPublicKey(
String algorithm,
ECPublicKeyParameters params,
ECParameterSpec spec,
ProviderConfiguration configuration)
{
ECDomainParameters dp = params.getParameters();
this.algorithm = algorithm;
this.q = params.getQ();
this.configuration = configuration;
if (spec == null)
{
this.ecSpec = new ECParameterSpec(
dp.getCurve(),
dp.getG(),
dp.getN(),
dp.getH(),
dp.getSeed());
}
else
{
this.ecSpec = spec;
}
}
public BCECPublicKey(
String algorithm,
ECPublicKeyParameters params,
ProviderConfiguration configuration)
{
this.algorithm = algorithm;
this.q = params.getQ();
this.ecSpec = null;
this.configuration = configuration;
}
BCECPublicKey(
ECPublicKey key,
ProviderConfiguration configuration)
{
this.q = key.getQ();
this.algorithm = key.getAlgorithm();
this.ecSpec = key.getParameters();
this.configuration = configuration;
}
BCECPublicKey(
String algorithm,
ECPoint q,
ECParameterSpec ecSpec,
ProviderConfiguration configuration)
{
this.algorithm = algorithm;
this.q = q;
this.ecSpec = ecSpec;
this.configuration = configuration;
}
BCECPublicKey(
SubjectPublicKeyInfo info,
ProviderConfiguration configuration)
{
this.configuration = configuration;
populateFromPubKeyInfo(info);
}
BCECPublicKey(
String algorithm,
SubjectPublicKeyInfo info,
ProviderConfiguration configuration)
{
this.configuration = configuration;
populateFromPubKeyInfo(info);
this.algorithm = algorithm;
}
private void populateFromPubKeyInfo(SubjectPublicKeyInfo info)
{
X962Parameters params = X962Parameters.getInstance(info.getAlgorithmId().getParameters());
ECCurve curve;
if (params.isNamedCurve())
{
ASN1ObjectIdentifier oid = ASN1ObjectIdentifier.getInstance(params.getParameters());
X9ECParameters ecP = ECUtil.getNamedCurveByOid(oid);
ecSpec = new ECNamedCurveParameterSpec(
ECUtil.getCurveName(oid),
ecP.getCurve(),
ecP.getG(),
ecP.getN(),
ecP.getH(),
ecP.getSeed());
curve = ((ECParameterSpec)ecSpec).getCurve();
}
else if (params.isImplicitlyCA())
{
ecSpec = null;
curve = BouncyCastleProvider.CONFIGURATION.getEcImplicitlyCa().getCurve();
}
else
{
X9ECParameters ecP = X9ECParameters.getInstance(params.getParameters());
ecSpec = new ECParameterSpec(
ecP.getCurve(),
ecP.getG(),
ecP.getN(),
ecP.getH(),
ecP.getSeed());
curve = ((ECParameterSpec)ecSpec).getCurve();
}
DERBitString bits = info.getPublicKeyData();
byte[] data = bits.getBytes();
ASN1OctetString key = new DEROctetString(data);
//
// extra octet string - one of our old certs...
//
if (data[0] == 0x04 && data[1] == data.length - 2
&& (data[2] == 0x02 || data[2] == 0x03))
{
int qLength = new X9IntegerConverter().getByteLength(curve);
if (qLength >= data.length - 3)
{
try
{
key = (ASN1OctetString)ASN1Primitive.fromByteArray(data);
}
catch (IOException ex)
{
throw new IllegalArgumentException("error recovering public key");
}
}
}
X9ECPoint derQ = new X9ECPoint(curve, key);
this.q = derQ.getPoint();
}
public String getAlgorithm()
{
return algorithm;
}
public String getFormat()
{
return "X.509";
}
public byte[] getEncoded()
{
SubjectPublicKeyInfo info;
X962Parameters params = null;
if (ecSpec instanceof ECNamedCurveParameterSpec)
{
ASN1ObjectIdentifier curveOid = ECUtil.getNamedCurveOid(((ECNamedCurveParameterSpec)ecSpec).getName());
if (curveOid == null)
{
curveOid = new ASN1ObjectIdentifier(((ECNamedCurveParameterSpec)ecSpec).getName());
}
params = new X962Parameters(curveOid);
}
else if (ecSpec == null)
{
params = new X962Parameters(DERNull.INSTANCE);
}
else
{
ECParameterSpec p = (ECParameterSpec)ecSpec;
ECCurve curve = p.getG().getCurve();
ECPoint generator = curve.createPoint(p.getG().getX().toBigInteger(), p.getG().getY().toBigInteger(), withCompression);
X9ECParameters ecP = new X9ECParameters(
p.getCurve(), generator, p.getN(), p.getH(), p.getSeed());
params = new X962Parameters(ecP);
}
ECCurve curve = this.engineGetQ().getCurve();
ECPoint point = curve.createPoint(this.getQ().getX().toBigInteger(), this.getQ().getY().toBigInteger(), withCompression);
ASN1OctetString p = ASN1OctetString.getInstance(new X9ECPoint(point));
info = new SubjectPublicKeyInfo(new AlgorithmIdentifier(X9ObjectIdentifiers.id_ecPublicKey, params), p.getOctets());
return KeyUtil.getEncodedSubjectPublicKeyInfo(info);
}
public ECParameterSpec getParams()
{
return (ECParameterSpec)ecSpec;
}
public ECParameterSpec getParameters()
{
return (ECParameterSpec)ecSpec;
}
public org.bouncycastle.math.ec.ECPoint getQ()
{
if (ecSpec == null)
{
if (q instanceof org.bouncycastle.math.ec.ECPoint.Fp)
{
return new org.bouncycastle.math.ec.ECPoint.Fp(null, q.getX(), q.getY());
}
else
{
return new org.bouncycastle.math.ec.ECPoint.F2m(null, q.getX(), q.getY());
}
}
return q;
}
public org.bouncycastle.math.ec.ECPoint engineGetQ()
{
return q;
}
public String toString()
{
StringBuffer buf = new StringBuffer();
String nl = System.getProperty("line.separator");
buf.append("EC Public Key").append(nl);
buf.append(" X: ").append(this.getQ().getX().toBigInteger().toString(16)).append(nl);
buf.append(" Y: ").append(this.getQ().getY().toBigInteger().toString(16)).append(nl);
return buf.toString();
}
public void setPointFormat(String style)
{
withCompression = !("UNCOMPRESSED".equalsIgnoreCase(style));
}
ECParameterSpec engineGetSpec()
{
if (ecSpec != null)
{
return (ECParameterSpec)ecSpec;
}
return BouncyCastleProvider.CONFIGURATION.getEcImplicitlyCa();
}
public boolean equals(Object o)
{
if (!(o instanceof BCECPublicKey))
{
return false;
}
BCECPublicKey other = (BCECPublicKey)o;
return getQ().equals(other.getQ()) && (engineGetSpec().equals(other.engineGetSpec()));
}
public int hashCode()
{
return getQ().hashCode() ^ engineGetSpec().hashCode();
}
private void readObject(
ObjectInputStream in)
throws IOException, ClassNotFoundException
{
in.defaultReadObject();
byte[] enc = (byte[])in.readObject();
populateFromPubKeyInfo(SubjectPublicKeyInfo.getInstance(ASN1Primitive.fromByteArray(enc)));
this.configuration = BouncyCastleProvider.CONFIGURATION;
}
private void writeObject(
ObjectOutputStream out)
throws IOException
{
out.defaultWriteObject();
out.writeObject(this.getEncoded());
}
}