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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar
contains APIs for JDK 1.5 and up. The APIs can be used in conjunction with a JCE/JCA provider such as the one
provided with the Bouncy Castle Cryptography APIs.
package org.bouncycastle.jcajce.provider.asymmetric.ec;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.security.interfaces.ECPublicKey;
import java.security.spec.ECParameterSpec;
import java.security.spec.ECPoint;
import java.security.spec.ECPublicKeySpec;
import java.security.spec.EllipticCurve;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.DERBitString;
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.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.EC5Util;
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.provider.BouncyCastleProvider;
import org.bouncycastle.math.ec.ECCurve;
import org.bouncycastle.util.Properties;
public class BCECPublicKey
implements ECPublicKey, org.bouncycastle.jce.interfaces.ECPublicKey, ECPointEncoder
{
static final long serialVersionUID = 2422789860422731812L;
private String algorithm = "EC";
private boolean withCompression;
private transient ECPublicKeyParameters ecPublicKey;
private transient ECParameterSpec ecSpec;
private transient ProviderConfiguration configuration;
public BCECPublicKey(
String algorithm,
BCECPublicKey key)
{
this.algorithm = algorithm;
this.ecPublicKey = key.ecPublicKey;
this.ecSpec = key.ecSpec;
this.withCompression = key.withCompression;
this.configuration = key.configuration;
}
public BCECPublicKey(
String algorithm,
ECPublicKeySpec spec,
ProviderConfiguration configuration)
{
this.algorithm = algorithm;
this.ecSpec = spec.getParams();
this.ecPublicKey = new ECPublicKeyParameters(EC5Util.convertPoint(ecSpec, spec.getW()), EC5Util.getDomainParameters(configuration, spec.getParams()));
this.configuration = configuration;
}
public BCECPublicKey(
String algorithm,
org.bouncycastle.jce.spec.ECPublicKeySpec spec,
ProviderConfiguration configuration)
{
this.algorithm = algorithm;
if (spec.getParams() != null) // can be null if implictlyCa
{
ECCurve curve = spec.getParams().getCurve();
EllipticCurve ellipticCurve = EC5Util.convertCurve(curve, spec.getParams().getSeed());
// this may seem a little long-winded but it's how we pick up the custom curve.
this.ecPublicKey = new ECPublicKeyParameters(
spec.getQ(), ECUtil.getDomainParameters(configuration, spec.getParams()));
this.ecSpec = EC5Util.convertSpec(ellipticCurve, spec.getParams());
}
else
{
org.bouncycastle.jce.spec.ECParameterSpec s = configuration.getEcImplicitlyCa();
this.ecPublicKey = new ECPublicKeyParameters(s.getCurve().createPoint(spec.getQ().getAffineXCoord().toBigInteger(), spec.getQ().getAffineYCoord().toBigInteger()), EC5Util.getDomainParameters(configuration, (ECParameterSpec)null));
this.ecSpec = null;
}
this.configuration = configuration;
}
public BCECPublicKey(
String algorithm,
ECPublicKeyParameters params,
ECParameterSpec spec,
ProviderConfiguration configuration)
{
ECDomainParameters dp = params.getParameters();
this.algorithm = algorithm;
this.ecPublicKey = params;
if (spec == null)
{
EllipticCurve ellipticCurve = EC5Util.convertCurve(dp.getCurve(), dp.getSeed());
this.ecSpec = createSpec(ellipticCurve, dp);
}
else
{
this.ecSpec = spec;
}
this.configuration = configuration;
}
public BCECPublicKey(
String algorithm,
ECPublicKeyParameters params,
org.bouncycastle.jce.spec.ECParameterSpec spec,
ProviderConfiguration configuration)
{
ECDomainParameters dp = params.getParameters();
this.algorithm = algorithm;
if (spec == null)
{
EllipticCurve ellipticCurve = EC5Util.convertCurve(dp.getCurve(), dp.getSeed());
this.ecSpec = createSpec(ellipticCurve, dp);
}
else
{
EllipticCurve ellipticCurve = EC5Util.convertCurve(spec.getCurve(), spec.getSeed());
this.ecSpec = EC5Util.convertSpec(ellipticCurve, spec);
}
this.ecPublicKey = params;
this.configuration = configuration;
}
/*
* called for implicitCA
*/
public BCECPublicKey(
String algorithm,
ECPublicKeyParameters params,
ProviderConfiguration configuration)
{
this.algorithm = algorithm;
this.ecPublicKey = params;
this.ecSpec = null;
this.configuration = configuration;
}
public BCECPublicKey(
ECPublicKey key,
ProviderConfiguration configuration)
{
this.algorithm = key.getAlgorithm();
this.ecSpec = key.getParams();
this.ecPublicKey = new ECPublicKeyParameters(EC5Util.convertPoint(this.ecSpec, key.getW()), EC5Util.getDomainParameters(configuration, key.getParams()));
this.configuration = configuration;
}
BCECPublicKey(
String algorithm,
SubjectPublicKeyInfo info,
ProviderConfiguration configuration)
{
this.algorithm = algorithm;
this.configuration = configuration;
populateFromPubKeyInfo(info);
}
private ECParameterSpec createSpec(EllipticCurve ellipticCurve, ECDomainParameters dp)
{
return new ECParameterSpec(
ellipticCurve,
EC5Util.convertPoint(dp.getG()),
dp.getN(),
dp.getH().intValue());
}
private void populateFromPubKeyInfo(SubjectPublicKeyInfo info)
{
X962Parameters params = X962Parameters.getInstance(info.getAlgorithm().getParameters());
ECCurve curve = EC5Util.getCurve(configuration, params);
ecSpec = EC5Util.convertToSpec(params, curve);
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.ecPublicKey = new ECPublicKeyParameters(derQ.getPoint(), ECUtil.getDomainParameters(configuration, params));
}
public String getAlgorithm()
{
return algorithm;
}
public String getFormat()
{
return "X.509";
}
public byte[] getEncoded()
{
boolean compress = withCompression || Properties.isOverrideSet("org.bouncycastle.ec.enable_pc");
AlgorithmIdentifier algId = new AlgorithmIdentifier(
X9ObjectIdentifiers.id_ecPublicKey,
ECUtils.getDomainParametersFromName(ecSpec, compress));
byte[] pubKeyOctets = ecPublicKey.getQ().getEncoded(compress);
// stored curve is null if ImplicitlyCa
return KeyUtil.getEncodedSubjectPublicKeyInfo(algId, pubKeyOctets);
}
public ECParameterSpec getParams()
{
return ecSpec;
}
public org.bouncycastle.jce.spec.ECParameterSpec getParameters()
{
if (ecSpec == null) // implictlyCA
{
return null;
}
return EC5Util.convertSpec(ecSpec);
}
public ECPoint getW()
{
return EC5Util.convertPoint(ecPublicKey.getQ());
}
public org.bouncycastle.math.ec.ECPoint getQ()
{
org.bouncycastle.math.ec.ECPoint q = ecPublicKey.getQ();
if (ecSpec == null)
{
return q.getDetachedPoint();
}
return q;
}
ECPublicKeyParameters engineGetKeyParameters()
{
return ecPublicKey;
}
org.bouncycastle.jce.spec.ECParameterSpec engineGetSpec()
{
if (ecSpec != null)
{
return EC5Util.convertSpec(ecSpec);
}
return configuration.getEcImplicitlyCa();
}
public String toString()
{
return ECUtil.publicKeyToString("EC", ecPublicKey.getQ(), engineGetSpec());
}
public void setPointFormat(String style)
{
withCompression = !("UNCOMPRESSED".equalsIgnoreCase(style));
}
public boolean equals(Object o)
{
if (!(o instanceof BCECPublicKey))
{
return false;
}
BCECPublicKey other = (BCECPublicKey)o;
return ecPublicKey.getQ().equals(other.ecPublicKey.getQ()) && (engineGetSpec().equals(other.engineGetSpec()));
}
public int hashCode()
{
return ecPublicKey.getQ().hashCode() ^ engineGetSpec().hashCode();
}
private void readObject(
ObjectInputStream in)
throws IOException, ClassNotFoundException
{
in.defaultReadObject();
byte[] enc = (byte[])in.readObject();
this.configuration = BouncyCastleProvider.CONFIGURATION;
populateFromPubKeyInfo(SubjectPublicKeyInfo.getInstance(ASN1Primitive.fromByteArray(enc)));
}
private void writeObject(
ObjectOutputStream out)
throws IOException
{
out.defaultWriteObject();
out.writeObject(this.getEncoded());
}
}