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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 1.6.
package org.bouncycastle.jce.provider;
import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1InputStream;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.DERBitString;
import org.bouncycastle.asn1.DERNull;
import org.bouncycastle.asn1.DERObject;
import org.bouncycastle.asn1.DERObjectIdentifier;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.asn1.cryptopro.CryptoProObjectIdentifiers;
import org.bouncycastle.asn1.cryptopro.ECGOST3410NamedCurves;
import org.bouncycastle.asn1.cryptopro.GOST3410PublicKeyAlgParameters;
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.jce.ECGOST3410NamedCurveTable;
import org.bouncycastle.jce.interfaces.ECPointEncoder;
import org.bouncycastle.jce.spec.ECNamedCurveParameterSpec;
import org.bouncycastle.jce.spec.ECNamedCurveSpec;
import org.bouncycastle.math.ec.ECCurve;
import java.io.IOException;
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;
public class JCEECPublicKey
implements ECPublicKey, org.bouncycastle.jce.interfaces.ECPublicKey, ECPointEncoder
{
private String algorithm = "EC";
private org.bouncycastle.math.ec.ECPoint q;
private ECParameterSpec ecSpec;
private boolean withCompression;
private GOST3410PublicKeyAlgParameters gostParams;
JCEECPublicKey(
String algorithm,
JCEECPublicKey key)
{
this.algorithm = algorithm;
this.q = key.q;
this.ecSpec = key.ecSpec;
this.withCompression = key.withCompression;
this.gostParams = key.gostParams;
}
JCEECPublicKey(
String algorithm,
ECPublicKeySpec spec)
{
this.algorithm = algorithm;
this.ecSpec = spec.getParams();
this.q = EC5Util.convertPoint(ecSpec, spec.getW(), false);
}
JCEECPublicKey(
String algorithm,
org.bouncycastle.jce.spec.ECPublicKeySpec spec)
{
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.ecSpec = EC5Util.convertSpec(ellipticCurve, spec.getParams());
}
else
{
if (q.getCurve() == null)
{
org.bouncycastle.jce.spec.ECParameterSpec s = ProviderUtil.getEcImplicitlyCa();
q = s.getCurve().createPoint(q.getX().toBigInteger(), q.getY().toBigInteger(), false);
}
this.ecSpec = null;
}
}
JCEECPublicKey(
String algorithm,
ECPublicKeyParameters params,
ECParameterSpec spec)
{
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;
}
}
JCEECPublicKey(
String algorithm,
ECPublicKeyParameters params,
org.bouncycastle.jce.spec.ECParameterSpec spec)
{
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
{
EllipticCurve ellipticCurve = EC5Util.convertCurve(spec.getCurve(), spec.getSeed());
this.ecSpec = EC5Util.convertSpec(ellipticCurve, spec);
}
}
/*
* called for implicitCA
*/
JCEECPublicKey(
String algorithm,
ECPublicKeyParameters params)
{
this.algorithm = algorithm;
this.q = params.getQ();
this.ecSpec = null;
}
private ECParameterSpec createSpec(EllipticCurve ellipticCurve, ECDomainParameters dp)
{
return new ECParameterSpec(
ellipticCurve,
new ECPoint(
dp.getG().getX().toBigInteger(),
dp.getG().getY().toBigInteger()),
dp.getN(),
dp.getH().intValue());
}
JCEECPublicKey(
ECPublicKey key)
{
this.algorithm = key.getAlgorithm();
this.ecSpec = key.getParams();
this.q = EC5Util.convertPoint(this.ecSpec, key.getW(), false);
}
JCEECPublicKey(
SubjectPublicKeyInfo info)
{
if (info.getAlgorithmId().getObjectId().equals(CryptoProObjectIdentifiers.gostR3410_2001))
{
DERBitString bits = info.getPublicKeyData();
ASN1OctetString key;
this.algorithm = "ECGOST3410";
try
{
ASN1InputStream aIn = new ASN1InputStream(bits.getBytes());
key = (ASN1OctetString)aIn.readObject();
}
catch (IOException ex)
{
throw new IllegalArgumentException("error recovering public key");
}
byte[] keyEnc = key.getOctets();
byte[] x = new byte[32];
byte[] y = new byte[32];
for (int i = 0; i != y.length; i++)
{
x[i] = keyEnc[32 - 1 - i];
}
for (int i = 0; i != x.length; i++)
{
y[i] = keyEnc[64 - 1 - i];
}
gostParams = new GOST3410PublicKeyAlgParameters((ASN1Sequence)info.getAlgorithmId().getParameters());
ECNamedCurveParameterSpec spec = ECGOST3410NamedCurveTable.getParameterSpec(ECGOST3410NamedCurves.getName(gostParams.getPublicKeyParamSet()));
ECCurve curve = spec.getCurve();
EllipticCurve ellipticCurve = EC5Util.convertCurve(curve, spec.getSeed());
this.q = curve.createPoint(new BigInteger(1, x), new BigInteger(1, y), false);
ecSpec = new ECNamedCurveSpec(
ECGOST3410NamedCurves.getName(gostParams.getPublicKeyParamSet()),
ellipticCurve,
new ECPoint(
spec.getG().getX().toBigInteger(),
spec.getG().getY().toBigInteger()),
spec.getN(), spec.getH());
}
else
{
X962Parameters params = new X962Parameters((DERObject)info.getAlgorithmId().getParameters());
ECCurve curve;
EllipticCurve ellipticCurve;
if (params.isNamedCurve())
{
DERObjectIdentifier oid = (DERObjectIdentifier)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().getX().toBigInteger(),
ecP.getG().getY().toBigInteger()),
ecP.getN(),
ecP.getH());
}
else if (params.isImplicitlyCA())
{
ecSpec = null;
curve = ProviderUtil.getEcImplicitlyCa().getCurve();
}
else
{
X9ECParameters ecP = new X9ECParameters((ASN1Sequence)params.getParameters());
curve = ecP.getCurve();
ellipticCurve = EC5Util.convertCurve(curve, ecP.getSeed());
this.ecSpec = new ECParameterSpec(
ellipticCurve,
new ECPoint(
ecP.getG().getX().toBigInteger(),
ecP.getG().getY().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
{
ASN1InputStream aIn = new ASN1InputStream(data);
key = (ASN1OctetString)aIn.readObject();
}
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 (algorithm.equals("ECGOST3410"))
{
if (gostParams != null)
{
params = gostParams;
}
else
{
params = new GOST3410PublicKeyAlgParameters(
ECGOST3410NamedCurves.getOID(((ECNamedCurveSpec)ecSpec).getName()),
CryptoProObjectIdentifiers.gostR3411_94_CryptoProParamSet);
}
BigInteger bX = this.q.getX().toBigInteger();
BigInteger bY = this.q.getY().toBigInteger();
byte[] encKey = new byte[64];
extractBytes(encKey, 0, bX);
extractBytes(encKey, 32, bY);
info = new SubjectPublicKeyInfo(new AlgorithmIdentifier(CryptoProObjectIdentifiers.gostR3410_2001, params.getDERObject()), new DEROctetString(encKey));
}
else
{
if (ecSpec instanceof ECNamedCurveSpec)
{
DERObjectIdentifier curveOid = ECUtil.getNamedCurveOid(((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 = (ASN1OctetString)
new X9ECPoint(curve.createPoint(this.getQ().getX().toBigInteger(), this.getQ().getY().toBigInteger(), withCompression)).getDERObject();
info = new SubjectPublicKeyInfo(new AlgorithmIdentifier(X9ObjectIdentifiers.id_ecPublicKey, params.getDERObject()), p.getOctets());
}
return info.getDEREncoded();
}
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);
}
for (int i = 0; i != 32; i++)
{
encKey[offSet + i] = val[val.length - 1 - i];
}
}
public ECParameterSpec getParams()
{
return ecSpec;
}
public org.bouncycastle.jce.spec.ECParameterSpec getParameters()
{
if (ecSpec == null) // implictlyCA
{
return null;
}
return EC5Util.convertSpec(ecSpec, withCompression);
}
public ECPoint getW()
{
return new ECPoint(q.getX().toBigInteger(), q.getY().toBigInteger());
}
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;
}
org.bouncycastle.math.ec.ECPoint engineGetQ()
{
return q;
}
org.bouncycastle.jce.spec.ECParameterSpec engineGetSpec()
{
if (ecSpec != null)
{
return EC5Util.convertSpec(ecSpec, withCompression);
}
return ProviderUtil.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.getX().toBigInteger().toString(16)).append(nl);
buf.append(" Y: ").append(this.q.getY().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 JCEECPublicKey))
{
return false;
}
JCEECPublicKey other = (JCEECPublicKey)o;
return engineGetQ().equals(other.engineGetQ()) && (engineGetSpec().equals(other.engineGetSpec()));
}
public int hashCode()
{
return engineGetQ().hashCode() ^ engineGetSpec().hashCode();
}
}