package org.bouncycastle.jcajce.provider.asymmetric.dstu;
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.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.DEROctetString;
import org.bouncycastle.asn1.ua.DSTU4145BinaryField;
import org.bouncycastle.asn1.ua.DSTU4145ECBinary;
import org.bouncycastle.asn1.ua.DSTU4145NamedCurves;
import org.bouncycastle.asn1.ua.DSTU4145Params;
import org.bouncycastle.asn1.ua.DSTU4145PointEncoder;
import org.bouncycastle.asn1.ua.UAObjectIdentifiers;
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.crypto.params.ECDomainParameters;
import org.bouncycastle.crypto.params.ECPublicKeyParameters;
import org.bouncycastle.jcajce.provider.asymmetric.util.EC5Util;
import org.bouncycastle.jcajce.provider.asymmetric.util.KeyUtil;
import org.bouncycastle.jce.interfaces.ECPointEncoder;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.jce.spec.ECNamedCurveParameterSpec;
import org.bouncycastle.jce.spec.ECNamedCurveSpec;
import org.bouncycastle.math.ec.ECCurve;
public class BCDSTU4145PublicKey
implements ECPublicKey, org.bouncycastle.jce.interfaces.ECPublicKey, ECPointEncoder
{
static final long serialVersionUID = 7026240464295649314L;
private String algorithm = "DSTU4145";
private boolean withCompression;
private transient org.bouncycastle.math.ec.ECPoint q;
private transient ECParameterSpec ecSpec;
private transient DSTU4145Params dstuParams;
public BCDSTU4145PublicKey(
BCDSTU4145PublicKey key)
{
this.q = key.q;
this.ecSpec = key.ecSpec;
this.withCompression = key.withCompression;
this.dstuParams = key.dstuParams;
}
public BCDSTU4145PublicKey(
ECPublicKeySpec spec)
{
this.ecSpec = spec.getParams();
this.q = EC5Util.convertPoint(ecSpec, spec.getW(), false);
}
public BCDSTU4145PublicKey(
org.bouncycastle.jce.spec.ECPublicKeySpec spec)
{
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 = BouncyCastleProvider.CONFIGURATION.getEcImplicitlyCa();
q = s.getCurve().createPoint(q.getX().toBigInteger(), q.getY().toBigInteger(), false);
}
this.ecSpec = null;
}
}
public BCDSTU4145PublicKey(
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;
}
}
public BCDSTU4145PublicKey(
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
*/
public BCDSTU4145PublicKey(
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());
}
public BCDSTU4145PublicKey(
ECPublicKey key)
{
this.algorithm = key.getAlgorithm();
this.ecSpec = key.getParams();
this.q = EC5Util.convertPoint(this.ecSpec, key.getW(), false);
}
BCDSTU4145PublicKey(
SubjectPublicKeyInfo info)
{
populateFromPubKeyInfo(info);
}
private void reverseBytes(byte[] bytes)
{
byte tmp;
for (int i = 0; i < bytes.length / 2; i++)
{
tmp = bytes[i];
bytes[i] = bytes[bytes.length - 1 - i];
bytes[bytes.length - 1 - i] = tmp;
}
}
private void populateFromPubKeyInfo(SubjectPublicKeyInfo info)
{
DERBitString bits = info.getPublicKeyData();
ASN1OctetString key;
this.algorithm = "DSTU4145";
try
{
key = (ASN1OctetString)ASN1Primitive.fromByteArray(bits.getBytes());
}
catch (IOException ex)
{
throw new IllegalArgumentException("error recovering public key");
}
byte[] keyEnc = key.getOctets();
if (info.getAlgorithm().getAlgorithm().equals(UAObjectIdentifiers.dstu4145le))
{
reverseBytes(keyEnc);
}
dstuParams = DSTU4145Params.getInstance((ASN1Sequence)info.getAlgorithm().getParameters());
//ECNamedCurveParameterSpec spec = ECGOST3410NamedCurveTable.getParameterSpec(ECGOST3410NamedCurves.getName(gostParams.getPublicKeyParamSet()));
org.bouncycastle.jce.spec.ECParameterSpec spec = null;
if (dstuParams.isNamedCurve())
{
ASN1ObjectIdentifier curveOid = dstuParams.getNamedCurve();
ECDomainParameters ecP = DSTU4145NamedCurves.getByOID(curveOid);
spec = new ECNamedCurveParameterSpec(curveOid.getId(), ecP.getCurve(), ecP.getG(), ecP.getN(), ecP.getH(), ecP.getSeed());
}
else
{
DSTU4145ECBinary binary = dstuParams.getECBinary();
byte[] b_bytes = binary.getB();
if (info.getAlgorithm().getAlgorithm().equals(UAObjectIdentifiers.dstu4145le))
{
reverseBytes(b_bytes);
}
DSTU4145BinaryField field = binary.getField();
ECCurve curve = new ECCurve.F2m(field.getM(), field.getK1(), field.getK2(), field.getK3(), binary.getA(), new BigInteger(1, b_bytes));
byte[] g_bytes = binary.getG();
if (info.getAlgorithm().getAlgorithm().equals(UAObjectIdentifiers.dstu4145le))
{
reverseBytes(g_bytes);
}
spec = new org.bouncycastle.jce.spec.ECParameterSpec(curve, DSTU4145PointEncoder.decodePoint(curve, g_bytes), binary.getN());
}
ECCurve curve = spec.getCurve();
EllipticCurve ellipticCurve = EC5Util.convertCurve(curve, spec.getSeed());
//this.q = curve.createPoint(new BigInteger(1, x), new BigInteger(1, y), false);
this.q = DSTU4145PointEncoder.decodePoint(curve, keyEnc);
if (dstuParams.isNamedCurve())
{
ecSpec = new ECNamedCurveSpec(
dstuParams.getNamedCurve().getId(),
ellipticCurve,
new ECPoint(
spec.getG().getX().toBigInteger(),
spec.getG().getY().toBigInteger()),
spec.getN(), spec.getH());
}
else
{
ecSpec = new ECParameterSpec(
ellipticCurve,
new ECPoint(
spec.getG().getX().toBigInteger(),
spec.getG().getY().toBigInteger()),
spec.getN(), spec.getH().intValue());
}
}
public byte[] getSbox()
{
if (null != dstuParams)
{
return dstuParams.getDKE();
}
else
{
return DSTU4145Params.getDefaultDKE();
}
}
public String getAlgorithm()
{
return algorithm;
}
public String getFormat()
{
return "X.509";
}
public byte[] getEncoded()
{
ASN1Encodable params;
SubjectPublicKeyInfo info;
if (dstuParams != null)
{
params = dstuParams;
}
else
{
if (ecSpec instanceof ECNamedCurveSpec)
{
params = new DSTU4145Params(new ASN1ObjectIdentifier(((ECNamedCurveSpec)ecSpec).getName()));
}
else
{ // strictly speaking this may not be applicable...
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);
}
}
byte[] encKey = DSTU4145PointEncoder.encodePoint(this.q);
try
{
info = new SubjectPublicKeyInfo(new AlgorithmIdentifier(UAObjectIdentifiers.dstu4145be, params), new DEROctetString(encKey));
}
catch (IOException e)
{
return null;
}
return KeyUtil.getEncodedSubjectPublicKeyInfo(info);
}
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;
}
public org.bouncycastle.math.ec.ECPoint engineGetQ()
{
return q;
}
org.bouncycastle.jce.spec.ECParameterSpec engineGetSpec()
{
if (ecSpec != null)
{
return EC5Util.convertSpec(ecSpec, withCompression);
}
return BouncyCastleProvider.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.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 BCDSTU4145PublicKey))
{
return false;
}
BCDSTU4145PublicKey other = (BCDSTU4145PublicKey)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)));
}
private void writeObject(
ObjectOutputStream out)
throws IOException
{
out.defaultWriteObject();
out.writeObject(this.getEncoded());
}
}