org.bouncycastle.jcajce.provider.asymmetric.ecgost12.BCECGOST3410_2012PublicKey Maven / Gradle / Ivy
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package org.bouncycastle.jcajce.provider.asymmetric.ecgost12;
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.DERBitString;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.asn1.cryptopro.ECGOST3410NamedCurves;
import org.bouncycastle.asn1.cryptopro.GOST3410PublicKeyAlgParameters;
import org.bouncycastle.asn1.rosstandart.RosstandartObjectIdentifiers;
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.crypto.params.ECDomainParameters;
import org.bouncycastle.crypto.params.ECGOST3410Parameters;
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.ECGOST3410NamedCurveTable;
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;
/**
* Represent two kind of GOST34.10 2012 PublicKeys: with 256 and 512 size
*/
public class BCECGOST3410_2012PublicKey
implements ECPublicKey, org.bouncycastle.jce.interfaces.ECPublicKey, ECPointEncoder
{
static final long serialVersionUID = 7026240464295649314L;
private String algorithm = "ECGOST3410-2012";
private boolean withCompression;
private transient ECPublicKeyParameters ecPublicKey;
private transient ECParameterSpec ecSpec;
private transient GOST3410PublicKeyAlgParameters gostParams;
public BCECGOST3410_2012PublicKey(
BCECGOST3410_2012PublicKey key)
{
this.ecPublicKey = key.ecPublicKey;
this.ecSpec = key.ecSpec;
this.withCompression = key.withCompression;
this.gostParams = key.gostParams;
}
public BCECGOST3410_2012PublicKey(
ECPublicKeySpec spec)
{
this.ecSpec = spec.getParams();
this.ecPublicKey = new ECPublicKeyParameters(EC5Util.convertPoint(ecSpec, spec.getW()), EC5Util.getDomainParameters(null, spec.getParams()));
}
public BCECGOST3410_2012PublicKey(
org.bouncycastle.jce.spec.ECPublicKeySpec spec,
ProviderConfiguration configuration)
{
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;
}
}
public BCECGOST3410_2012PublicKey(
String algorithm,
ECPublicKeyParameters params,
ECParameterSpec spec)
{
ECDomainParameters dp = params.getParameters();
this.algorithm = algorithm;
this.ecPublicKey = params;
if (dp instanceof ECGOST3410Parameters)
{
ECGOST3410Parameters p = (ECGOST3410Parameters)dp;
this.gostParams = new GOST3410PublicKeyAlgParameters(p.getPublicKeyParamSet(),
p.getDigestParamSet(), p.getEncryptionParamSet());
}
if (spec == null)
{
EllipticCurve ellipticCurve = EC5Util.convertCurve(dp.getCurve(), dp.getSeed());
this.ecSpec = createSpec(ellipticCurve, dp);
}
else
{
this.ecSpec = spec;
}
}
public BCECGOST3410_2012PublicKey(
String algorithm,
ECPublicKeyParameters params,
org.bouncycastle.jce.spec.ECParameterSpec spec)
{
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
{
EllipticCurve ellipticCurve = EC5Util.convertCurve(spec.getCurve(), spec.getSeed());
this.ecSpec = EC5Util.convertSpec(ellipticCurve, spec);
}
}
/*
* called for implicitCA
*/
public BCECGOST3410_2012PublicKey(
String algorithm,
ECPublicKeyParameters params)
{
this.algorithm = algorithm;
this.ecPublicKey = params;
this.ecSpec = null;
}
private ECParameterSpec createSpec(EllipticCurve ellipticCurve, ECDomainParameters dp)
{
return new ECParameterSpec(
ellipticCurve,
EC5Util.convertPoint(dp.getG()),
dp.getN(),
dp.getH().intValue());
}
public BCECGOST3410_2012PublicKey(
ECPublicKey key)
{
this.algorithm = key.getAlgorithm();
this.ecSpec = key.getParams();
this.ecPublicKey = new ECPublicKeyParameters(EC5Util.convertPoint(this.ecSpec, key.getW()), EC5Util.getDomainParameters(null, key.getParams()));
}
BCECGOST3410_2012PublicKey(
SubjectPublicKeyInfo info)
{
populateFromPubKeyInfo(info);
}
private void populateFromPubKeyInfo(SubjectPublicKeyInfo info)
{
ASN1ObjectIdentifier algOid = info.getAlgorithm().getAlgorithm();
DERBitString bits = info.getPublicKeyData();
ASN1OctetString key;
this.algorithm = "ECGOST3410-2012";
try
{
key = (ASN1OctetString)ASN1Primitive.fromByteArray(bits.getBytes());
}
catch (IOException ex)
{
throw new IllegalArgumentException("error recovering public key");
}
byte[] keyEnc = key.getOctets();
int fieldSize = 32;
if (algOid.equals(RosstandartObjectIdentifiers.id_tc26_gost_3410_12_512))
{
fieldSize = 64;
}
int keySize = 2 * fieldSize;
byte[] x9Encoding = new byte[1 + keySize];
x9Encoding[0] = 0x04;
for (int i = 1; i <= fieldSize; ++i)
{
x9Encoding[i ] = keyEnc[fieldSize - i];
x9Encoding[i + fieldSize] = keyEnc[keySize - i];
}
this.gostParams = GOST3410PublicKeyAlgParameters.getInstance(info.getAlgorithm().getParameters());
ECNamedCurveParameterSpec spec = ECGOST3410NamedCurveTable.getParameterSpec(ECGOST3410NamedCurves.getName(gostParams.getPublicKeyParamSet()));
ECCurve curve = spec.getCurve();
EllipticCurve ellipticCurve = EC5Util.convertCurve(curve, spec.getSeed());
this.ecPublicKey = new ECPublicKeyParameters(curve.decodePoint(x9Encoding), ECUtil.getDomainParameters(null, spec));
this.ecSpec = new ECNamedCurveSpec(
ECGOST3410NamedCurves.getName(gostParams.getPublicKeyParamSet()),
ellipticCurve,
EC5Util.convertPoint(spec.getG()),
spec.getN(), spec.getH());
}
public String getAlgorithm()
{
return algorithm;
}
public String getFormat()
{
return "X.509";
}
public byte[] getEncoded()
{
ASN1Encodable params;
SubjectPublicKeyInfo info;
// ecPublicKey.getQ().
BigInteger bX = this.ecPublicKey.getQ().getAffineXCoord().toBigInteger();
BigInteger bY = this.ecPublicKey.getQ().getAffineYCoord().toBigInteger();
// need to detect key size
boolean is512 = (bX.bitLength() > 256);
params = getGostParams();
if (params == null)
{
if (ecSpec instanceof ECNamedCurveSpec)
{
if (is512)
{
params = new GOST3410PublicKeyAlgParameters(
ECGOST3410NamedCurves.getOID(((ECNamedCurveSpec)ecSpec).getName()),
RosstandartObjectIdentifiers.id_tc26_gost_3411_12_512);
}
else
{
params = new GOST3410PublicKeyAlgParameters(
ECGOST3410NamedCurves.getOID(((ECNamedCurveSpec)ecSpec).getName()),
RosstandartObjectIdentifiers.id_tc26_gost_3411_12_256);
}
}
else
{ // strictly speaking this may not be applicable...
ECCurve curve = EC5Util.convertCurve(ecSpec.getCurve());
X9ECParameters ecP = new X9ECParameters(
curve,
new X9ECPoint(EC5Util.convertPoint(curve, ecSpec.getGenerator()), withCompression),
ecSpec.getOrder(),
BigInteger.valueOf(ecSpec.getCofactor()),
ecSpec.getCurve().getSeed());
params = new X962Parameters(ecP);
}
}
int encKeySize;
int offset;
ASN1ObjectIdentifier algIdentifier;
if (is512)
{
encKeySize = 128;
offset = 64;
algIdentifier = RosstandartObjectIdentifiers.id_tc26_gost_3410_12_512;
}
else
{
encKeySize = 64;
offset = 32;
algIdentifier = RosstandartObjectIdentifiers.id_tc26_gost_3410_12_256;
}
byte[] encKey = new byte[encKeySize];
extractBytes(encKey, encKeySize / 2, 0, bX);
extractBytes(encKey, encKeySize / 2, offset, bY);
try
{
info = new SubjectPublicKeyInfo(new AlgorithmIdentifier(algIdentifier, params),
new DEROctetString(encKey));
}
catch (IOException e)
{
return null;
}
return KeyUtil.getEncodedSubjectPublicKeyInfo(info);
}
private void extractBytes(byte[] encKey, int size, int offSet, BigInteger bI)
{
byte[] val = bI.toByteArray();
if (val.length < size)
{
byte[] tmp = new byte[size];
System.arraycopy(val, 0, tmp, tmp.length - val.length, val.length);
val = tmp;
}
for (int i = 0; i != size; 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);
}
public ECPoint getW()
{
return EC5Util.convertPoint(ecPublicKey.getQ());
}
public org.bouncycastle.math.ec.ECPoint getQ()
{
if (ecSpec == null)
{
return ecPublicKey.getQ().getDetachedPoint();
}
return ecPublicKey.getQ();
}
ECPublicKeyParameters engineGetKeyParameters()
{
return ecPublicKey;
}
org.bouncycastle.jce.spec.ECParameterSpec engineGetSpec()
{
if (ecSpec != null)
{
return EC5Util.convertSpec(ecSpec);
}
return BouncyCastleProvider.CONFIGURATION.getEcImplicitlyCa();
}
public String toString()
{
return ECUtil.publicKeyToString(algorithm, ecPublicKey.getQ(), engineGetSpec());
}
public void setPointFormat(String style)
{
withCompression = !("UNCOMPRESSED".equalsIgnoreCase(style));
}
public boolean equals(Object o)
{
if (!(o instanceof BCECGOST3410_2012PublicKey))
{
return false;
}
BCECGOST3410_2012PublicKey other = (BCECGOST3410_2012PublicKey)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();
populateFromPubKeyInfo(SubjectPublicKeyInfo.getInstance(ASN1Primitive.fromByteArray(enc)));
}
private void writeObject(
ObjectOutputStream out)
throws IOException
{
out.defaultWriteObject();
out.writeObject(this.getEncoded());
}
public GOST3410PublicKeyAlgParameters getGostParams()
{
if (gostParams == null && ecSpec instanceof ECNamedCurveSpec)
{
BigInteger bX = this.ecPublicKey.getQ().getAffineXCoord().toBigInteger();
// need to detect key size
boolean is512 = (bX.bitLength() > 256);
if (is512)
{
this.gostParams = new GOST3410PublicKeyAlgParameters(
ECGOST3410NamedCurves.getOID(((ECNamedCurveSpec)ecSpec).getName()),
RosstandartObjectIdentifiers.id_tc26_gost_3411_12_512);
}
else
{
this.gostParams = new GOST3410PublicKeyAlgParameters(
ECGOST3410NamedCurves.getOID(((ECNamedCurveSpec)ecSpec).getName()),
RosstandartObjectIdentifiers.id_tc26_gost_3411_12_256);
}
}
return gostParams;
}
}