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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle
intended for the Android platform. Android unfortunately ships with a stripped-down version of
Bouncy Castle, which prevents easy upgrades - Spongy Castle overcomes this and provides a full,
up-to-date version of the Bouncy Castle cryptographic libs.
package org.spongycastle.jcajce.provider.asymmetric.ec;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.math.BigInteger;
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.spongycastle.asn1.ASN1Encodable;
import org.spongycastle.asn1.ASN1ObjectIdentifier;
import org.spongycastle.asn1.ASN1OctetString;
import org.spongycastle.asn1.ASN1Primitive;
import org.spongycastle.asn1.DERBitString;
import org.spongycastle.asn1.DERNull;
import org.spongycastle.asn1.DEROctetString;
import org.spongycastle.asn1.x509.AlgorithmIdentifier;
import org.spongycastle.asn1.x509.SubjectPublicKeyInfo;
import org.spongycastle.asn1.x9.X962Parameters;
import org.spongycastle.asn1.x9.X9ECParameters;
import org.spongycastle.asn1.x9.X9ECPoint;
import org.spongycastle.asn1.x9.X9IntegerConverter;
import org.spongycastle.asn1.x9.X9ObjectIdentifiers;
import org.spongycastle.crypto.params.ECDomainParameters;
import org.spongycastle.crypto.params.ECPublicKeyParameters;
import org.spongycastle.jcajce.provider.asymmetric.util.EC5Util;
import org.spongycastle.jcajce.provider.asymmetric.util.ECUtil;
import org.spongycastle.jcajce.provider.asymmetric.util.KeyUtil;
import org.spongycastle.jcajce.provider.config.ProviderConfiguration;
import org.spongycastle.jce.interfaces.ECPointEncoder;
import org.spongycastle.jce.provider.BouncyCastleProvider;
import org.spongycastle.jce.spec.ECNamedCurveSpec;
import org.spongycastle.math.ec.ECCurve;
import org.spongycastle.math.ec.custom.sec.SecP256K1Point;
import org.spongycastle.math.ec.custom.sec.SecP256R1Point;
public class BCECPublicKey
implements ECPublicKey, org.spongycastle.jce.interfaces.ECPublicKey, ECPointEncoder
{
static final long serialVersionUID = 2422789860422731812L;
private String algorithm = "EC";
private boolean withCompression;
private transient org.spongycastle.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.ecSpec = spec.getParams();
this.q = EC5Util.convertPoint(ecSpec, spec.getW(), false);
this.configuration = configuration;
}
public BCECPublicKey(
String algorithm,
org.spongycastle.jce.spec.ECPublicKeySpec spec,
ProviderConfiguration configuration)
{
this.algorithm = algorithm;
this.q = spec.getQ();
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.q = EC5Util.convertCurve(ellipticCurve).createPoint(spec.getQ().getAffineXCoord().toBigInteger(), spec.getQ().getAffineYCoord().toBigInteger());
this.ecSpec = EC5Util.convertSpec(ellipticCurve, spec.getParams());
}
else
{
if (q.getCurve() == null)
{
org.spongycastle.jce.spec.ECParameterSpec s = configuration.getEcImplicitlyCa();
q = s.getCurve().createPoint(q.getXCoord().toBigInteger(), q.getYCoord().toBigInteger(), false);
}
this.ecSpec = null;
}
this.configuration = configuration;
}
public BCECPublicKey(
String algorithm,
ECPublicKeyParameters params,
ECParameterSpec spec,
ProviderConfiguration configuration)
{
ECDomainParameters dp = params.getParameters();
this.algorithm = algorithm;
this.q = params.getQ();
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.spongycastle.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.q = EC5Util.convertCurve(ecSpec.getCurve()).createPoint(params.getQ().getAffineXCoord().toBigInteger(), params.getQ().getAffineYCoord().toBigInteger());
this.configuration = configuration;
}
/*
* called for implicitCA
*/
public BCECPublicKey(
String algorithm,
ECPublicKeyParameters params,
ProviderConfiguration configuration)
{
this.algorithm = algorithm;
this.q = params.getQ();
this.ecSpec = null;
this.configuration = configuration;
}
public BCECPublicKey(
ECPublicKey key,
ProviderConfiguration configuration)
{
this.algorithm = key.getAlgorithm();
this.ecSpec = key.getParams();
this.q = EC5Util.convertPoint(this.ecSpec, key.getW(), false);
}
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,
new ECPoint(
dp.getG().getAffineXCoord().toBigInteger(),
dp.getG().getAffineYCoord().toBigInteger()),
dp.getN(),
dp.getH().intValue());
}
private void populateFromPubKeyInfo(SubjectPublicKeyInfo info)
{
X962Parameters params = new X962Parameters((ASN1Primitive)info.getAlgorithm().getParameters());
ECCurve curve;
EllipticCurve ellipticCurve;
if (params.isNamedCurve())
{
ASN1ObjectIdentifier oid = (ASN1ObjectIdentifier)params.getParameters();
X9ECParameters ecP = ECUtil.getNamedCurveByOid(oid);
curve = ecP.getCurve();
ellipticCurve = EC5Util.convertCurve(curve, ecP.getSeed());
ecSpec = new ECNamedCurveSpec(
ECUtil.getCurveName(oid),
ellipticCurve,
new ECPoint(
ecP.getG().getAffineXCoord().toBigInteger(),
ecP.getG().getAffineYCoord().toBigInteger()),
ecP.getN(),
ecP.getH());
}
else if (params.isImplicitlyCA())
{
ecSpec = null;
curve = configuration.getEcImplicitlyCa().getCurve();
}
else
{
X9ECParameters ecP = X9ECParameters.getInstance(params.getParameters());
curve = ecP.getCurve();
ellipticCurve = EC5Util.convertCurve(curve, ecP.getSeed());
this.ecSpec = new ECParameterSpec(
ellipticCurve,
new ECPoint(
ecP.getG().getAffineXCoord().toBigInteger(),
ecP.getG().getAffineYCoord().toBigInteger()),
ecP.getN(),
ecP.getH().intValue());
}
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()
{
ASN1Encodable params;
SubjectPublicKeyInfo info;
if (ecSpec instanceof ECNamedCurveSpec)
{
ASN1ObjectIdentifier curveOid = ECUtil.getNamedCurveOid(((ECNamedCurveSpec)ecSpec).getName());
if (curveOid == null)
{
curveOid = new ASN1ObjectIdentifier(((ECNamedCurveSpec)ecSpec).getName());
}
params = new X962Parameters(curveOid);
}
else if (ecSpec == null)
{
params = new X962Parameters(DERNull.INSTANCE);
}
else
{
ECCurve curve = EC5Util.convertCurve(ecSpec.getCurve());
X9ECParameters ecP = new X9ECParameters(
curve,
EC5Util.convertPoint(curve, ecSpec.getGenerator(), withCompression),
ecSpec.getOrder(),
BigInteger.valueOf(ecSpec.getCofactor()),
ecSpec.getCurve().getSeed());
params = new X962Parameters(ecP);
}
ECCurve curve = this.engineGetQ().getCurve();
ASN1OctetString p;
// stored curve is null if ImplicitlyCa
if (ecSpec == null)
{
p = (ASN1OctetString)
new X9ECPoint(curve.createPoint(this.getQ().getXCoord().toBigInteger(), this.getQ().getYCoord().toBigInteger(), withCompression)).toASN1Primitive();
}
else
{
p = (ASN1OctetString)
new X9ECPoint(curve.createPoint(this.getQ().getAffineXCoord().toBigInteger(), this.getQ().getAffineYCoord().toBigInteger(), withCompression)).toASN1Primitive();
}
info = new SubjectPublicKeyInfo(new AlgorithmIdentifier(X9ObjectIdentifiers.id_ecPublicKey, params), p.getOctets());
return KeyUtil.getEncodedSubjectPublicKeyInfo(info);
}
private void extractBytes(byte[] encKey, int offSet, BigInteger bI)
{
byte[] val = bI.toByteArray();
if (val.length < 32)
{
byte[] tmp = new byte[32];
System.arraycopy(val, 0, tmp, tmp.length - val.length, val.length);
val = tmp;
}
for (int i = 0; i != 32; i++)
{
encKey[offSet + i] = val[val.length - 1 - i];
}
}
public ECParameterSpec getParams()
{
return ecSpec;
}
public org.spongycastle.jce.spec.ECParameterSpec getParameters()
{
if (ecSpec == null) // implictlyCA
{
return null;
}
return EC5Util.convertSpec(ecSpec, withCompression);
}
public ECPoint getW()
{
return new ECPoint(q.getAffineXCoord().toBigInteger(), q.getAffineYCoord().toBigInteger());
}
public org.spongycastle.math.ec.ECPoint getQ()
{
if (ecSpec == null)
{
return q.getDetachedPoint();
}
return q;
}
public org.spongycastle.math.ec.ECPoint engineGetQ()
{
return q;
}
org.spongycastle.jce.spec.ECParameterSpec engineGetSpec()
{
if (ecSpec != null)
{
return EC5Util.convertSpec(ecSpec, withCompression);
}
return configuration.getEcImplicitlyCa();
}
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.q.getAffineXCoord().toBigInteger().toString(16)).append(nl);
buf.append(" Y: ").append(this.q.getAffineYCoord().toBigInteger().toString(16)).append(nl);
return buf.toString();
}
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 engineGetQ().equals(other.engineGetQ()) && (engineGetSpec().equals(other.engineGetSpec()));
}
public int hashCode()
{
return engineGetQ().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());
}
}
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