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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. Note: this package includes the NTRU encryption algorithms.
package org.bouncycastle.jcajce.provider.asymmetric.ecgost;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.math.BigInteger;
import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.DERBitString;
import org.bouncycastle.asn1.DERNull;
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.jcajce.provider.asymmetric.util.ECUtil;
import org.bouncycastle.jcajce.provider.asymmetric.util.KeyUtil;
import org.bouncycastle.jcajce.provider.config.ProviderConfiguration;
import org.bouncycastle.jce.ECGOST3410NamedCurveTable;
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;
import org.bouncycastle.jcajce.provider.asymmetric.util.ECUtil;
public class BCECGOST3410PublicKey
implements ECPublicKey, ECPointEncoder
{
private String algorithm = "ECGOST3410";
private boolean withCompression;
private transient ECPublicKeyParameters ecPublicKey;
private transient ECParameterSpec ecSpec;
private transient GOST3410PublicKeyAlgParameters gostParams;
public BCECGOST3410PublicKey(
String algorithm,
BCECGOST3410PublicKey key)
{
this.algorithm = algorithm;
this.ecPublicKey = key.ecPublicKey;
this.ecSpec = key.ecSpec;
this.withCompression = key.withCompression;
this.gostParams = key.gostParams;
}
public BCECGOST3410PublicKey(
ECPublicKeySpec spec,
ProviderConfiguration configuration)
{
if (spec.getParams() != null)
{
this.ecSpec = spec.getParams();
this.ecPublicKey = new ECPublicKeyParameters(spec.getQ(), ECUtil.getDomainParameters(configuration, spec.getParams()));
}
else
{
this.ecSpec = null;
org.bouncycastle.jce.spec.ECParameterSpec s = configuration.getEcImplicitlyCa();
this.ecPublicKey = new ECPublicKeyParameters(
s.getCurve().createPoint(spec.getQ().getAffineXCoord().toBigInteger(), spec.getQ().getAffineYCoord().toBigInteger()),
ECUtil.getDomainParameters(configuration, (ECParameterSpec)null));
}
}
public BCECGOST3410PublicKey(
String algorithm,
ECPublicKeyParameters params,
ECParameterSpec spec)
{
ECDomainParameters dp = params.getParameters();
this.algorithm = algorithm;
this.ecPublicKey = params;
if (spec == null)
{
this.ecSpec = new ECParameterSpec(
dp.getCurve(),
dp.getG(),
dp.getN(),
dp.getH(),
dp.getSeed());
}
else
{
this.ecSpec = spec;
}
}
public BCECGOST3410PublicKey(
String algorithm,
ECPublicKeyParameters params)
{
this.algorithm = algorithm;
this.ecPublicKey = params;
this.ecSpec = null;
}
BCECGOST3410PublicKey(
ECPublicKey key)
{
this.ecPublicKey = new ECPublicKeyParameters(key.getQ(), ECUtil.getDomainParameters(BouncyCastleProvider.CONFIGURATION, key.getParameters()));
this.algorithm = key.getAlgorithm();
this.ecSpec = key.getParameters();
}
BCECGOST3410PublicKey(
String algorithm,
ECPoint q,
ECParameterSpec ecSpec)
{
this.algorithm = algorithm;
this.ecPublicKey = new ECPublicKeyParameters(q, ECUtil.getDomainParameters(BouncyCastleProvider.CONFIGURATION, ecSpec));
this.ecSpec = ecSpec;
}
BCECGOST3410PublicKey(
SubjectPublicKeyInfo info)
{
populateFromPubKeyInfo(info);
}
private void populateFromPubKeyInfo(SubjectPublicKeyInfo info)
{
if (info.getAlgorithmId().getAlgorithm().equals(CryptoProObjectIdentifiers.gostR3410_2001))
{
DERBitString bits = info.getPublicKeyData();
ASN1OctetString key;
this.algorithm = "ECGOST3410";
try
{
key = (ASN1OctetString)ASN1Primitive.fromByteArray(bits.getBytes());
}
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 != x.length; i++)
{
x[i] = keyEnc[32 - 1 - i];
}
for (int i = 0; i != y.length; i++)
{
y[i] = keyEnc[64 - 1 - i];
}
gostParams = GOST3410PublicKeyAlgParameters.getInstance(info.getAlgorithmId().getParameters());
ECNamedCurveParameterSpec spec = ECGOST3410NamedCurveTable.getParameterSpec(ECGOST3410NamedCurves.getName(gostParams.getPublicKeyParamSet()));
ecSpec = spec;
ECPoint q = spec.getCurve().createPoint(new BigInteger(1, x), new BigInteger(1, y));
this.ecPublicKey = new ECPublicKeyParameters(q, ECUtil.getDomainParameters(BouncyCastleProvider.CONFIGURATION, ecSpec));
}
else
{
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);
ECPoint q = derQ.getPoint();
this.ecPublicKey = new ECPublicKeyParameters(q, ECUtil.getDomainParameters(BouncyCastleProvider.CONFIGURATION, ecSpec));
}
}
public String getAlgorithm()
{
return algorithm;
}
public String getFormat()
{
return "X.509";
}
public byte[] getEncoded()
{
ASN1Encodable params = null;
if (gostParams != null)
{
params = gostParams;
}
else if (ecSpec instanceof ECNamedCurveParameterSpec)
{
params = new GOST3410PublicKeyAlgParameters(
ECGOST3410NamedCurves.getOID(((ECNamedCurveParameterSpec)ecSpec).getName()),
CryptoProObjectIdentifiers.gostR3411_94_CryptoProParamSet);
}
else
{
ECParameterSpec p = (ECParameterSpec)ecSpec;
X9ECParameters ecP = new X9ECParameters(
p.getCurve(), new X9ECPoint(p.getG(), withCompression), p.getN(), p.getH(), p.getSeed());
params = new X962Parameters(ecP);
}
BigInteger bX = getQ().getAffineXCoord().toBigInteger();
BigInteger bY = getQ().getAffineYCoord().toBigInteger();
byte[] encKey = new byte[64];
byte[] val = bX.toByteArray();
for (int i = 0; i != 32; i++)
{
encKey[i] = val[val.length - 1 - i];
}
val = bY.toByteArray();
for (int i = 0; i != 32; i++)
{
encKey[32 + i] = val[val.length - 1 - i];
}
SubjectPublicKeyInfo info;
try
{
info = new SubjectPublicKeyInfo(new AlgorithmIdentifier(CryptoProObjectIdentifiers.gostR3410_2001, params), new DEROctetString(encKey));
}
catch (IOException e)
{
return null;
}
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)
{
return ecPublicKey.getQ().getDetachedPoint();
}
return ecPublicKey.getQ();
}
ECPublicKeyParameters engineGetKeyParameters()
{
return ecPublicKey;
}
public String toString()
{
return ECUtil.publicKeyToString(algorithm, ecPublicKey.getQ(), engineGetSpec());
}
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 BCECGOST3410PublicKey))
{
return false;
}
BCECGOST3410PublicKey other = (BCECGOST3410PublicKey)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)));
}
private void writeObject(
ObjectOutputStream out)
throws IOException
{
out.defaultWriteObject();
out.writeObject(this.getEncoded());
}
}