org.spongycastle.jcajce.provider.asymmetric.ecgost.BCECGOST3410PrivateKey Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of prov Show documentation
Show all versions of prov Show documentation
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.
The newest version!
package org.spongycastle.jcajce.provider.asymmetric.ecgost;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.math.BigInteger;
import java.security.interfaces.ECPrivateKey;
import java.security.spec.ECParameterSpec;
import java.security.spec.ECPoint;
import java.security.spec.ECPrivateKeySpec;
import java.security.spec.EllipticCurve;
import java.util.Enumeration;
import org.spongycastle.asn1.ASN1Encodable;
import org.spongycastle.asn1.ASN1Encoding;
import org.spongycastle.asn1.ASN1Integer;
import org.spongycastle.asn1.ASN1ObjectIdentifier;
import org.spongycastle.asn1.ASN1OctetString;
import org.spongycastle.asn1.ASN1Primitive;
import org.spongycastle.asn1.ASN1Sequence;
import org.spongycastle.asn1.DERBitString;
import org.spongycastle.asn1.DERNull;
import org.spongycastle.asn1.DEROctetString;
import org.spongycastle.asn1.cryptopro.CryptoProObjectIdentifiers;
import org.spongycastle.asn1.cryptopro.ECGOST3410NamedCurves;
import org.spongycastle.asn1.cryptopro.GOST3410PublicKeyAlgParameters;
import org.spongycastle.asn1.pkcs.PrivateKeyInfo;
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.crypto.params.ECDomainParameters;
import org.spongycastle.crypto.params.ECPrivateKeyParameters;
import org.spongycastle.jcajce.provider.asymmetric.util.EC5Util;
import org.spongycastle.jcajce.provider.asymmetric.util.ECUtil;
import org.spongycastle.jcajce.provider.asymmetric.util.PKCS12BagAttributeCarrierImpl;
import org.spongycastle.jce.ECGOST3410NamedCurveTable;
import org.spongycastle.jce.interfaces.ECPointEncoder;
import org.spongycastle.jce.interfaces.PKCS12BagAttributeCarrier;
import org.spongycastle.jce.provider.BouncyCastleProvider;
import org.spongycastle.jce.spec.ECNamedCurveParameterSpec;
import org.spongycastle.jce.spec.ECNamedCurveSpec;
import org.spongycastle.math.ec.ECCurve;
public class BCECGOST3410PrivateKey
implements ECPrivateKey, org.spongycastle.jce.interfaces.ECPrivateKey, PKCS12BagAttributeCarrier, ECPointEncoder
{
static final long serialVersionUID = 7245981689601667138L;
private String algorithm = "ECGOST3410";
private boolean withCompression;
private transient ASN1Encodable gostParams;
private transient BigInteger d;
private transient ECParameterSpec ecSpec;
private transient DERBitString publicKey;
private transient PKCS12BagAttributeCarrierImpl attrCarrier = new PKCS12BagAttributeCarrierImpl();
protected BCECGOST3410PrivateKey()
{
}
public BCECGOST3410PrivateKey(
ECPrivateKey key)
{
this.d = key.getS();
this.algorithm = key.getAlgorithm();
this.ecSpec = key.getParams();
}
public BCECGOST3410PrivateKey(
org.spongycastle.jce.spec.ECPrivateKeySpec spec)
{
this.d = spec.getD();
if (spec.getParams() != null) // can be null if implicitlyCA
{
ECCurve curve = spec.getParams().getCurve();
EllipticCurve ellipticCurve;
ellipticCurve = EC5Util.convertCurve(curve, spec.getParams().getSeed());
this.ecSpec = EC5Util.convertSpec(ellipticCurve, spec.getParams());
}
else
{
this.ecSpec = null;
}
}
public BCECGOST3410PrivateKey(
ECPrivateKeySpec spec)
{
this.d = spec.getS();
this.ecSpec = spec.getParams();
}
public BCECGOST3410PrivateKey(
BCECGOST3410PrivateKey key)
{
this.d = key.d;
this.ecSpec = key.ecSpec;
this.withCompression = key.withCompression;
this.attrCarrier = key.attrCarrier;
this.publicKey = key.publicKey;
this.gostParams = key.gostParams;
}
public BCECGOST3410PrivateKey(
String algorithm,
ECPrivateKeyParameters params,
BCECGOST3410PublicKey pubKey,
ECParameterSpec spec)
{
ECDomainParameters dp = params.getParameters();
this.algorithm = algorithm;
this.d = params.getD();
if (spec == null)
{
EllipticCurve ellipticCurve = EC5Util.convertCurve(dp.getCurve(), dp.getSeed());
this.ecSpec = new ECParameterSpec(
ellipticCurve,
new ECPoint(
dp.getG().getAffineXCoord().toBigInteger(),
dp.getG().getAffineYCoord().toBigInteger()),
dp.getN(),
dp.getH().intValue());
}
else
{
this.ecSpec = spec;
}
this.gostParams = pubKey.getGostParams();
publicKey = getPublicKeyDetails(pubKey);
}
public BCECGOST3410PrivateKey(
String algorithm,
ECPrivateKeyParameters params,
BCECGOST3410PublicKey pubKey,
org.spongycastle.jce.spec.ECParameterSpec spec)
{
ECDomainParameters dp = params.getParameters();
this.algorithm = algorithm;
this.d = params.getD();
if (spec == null)
{
EllipticCurve ellipticCurve = EC5Util.convertCurve(dp.getCurve(), dp.getSeed());
this.ecSpec = new ECParameterSpec(
ellipticCurve,
new ECPoint(
dp.getG().getAffineXCoord().toBigInteger(),
dp.getG().getAffineYCoord().toBigInteger()),
dp.getN(),
dp.getH().intValue());
}
else
{
EllipticCurve ellipticCurve = EC5Util.convertCurve(spec.getCurve(), spec.getSeed());
this.ecSpec = new ECParameterSpec(
ellipticCurve,
new ECPoint(
spec.getG().getAffineXCoord().toBigInteger(),
spec.getG().getAffineYCoord().toBigInteger()),
spec.getN(),
spec.getH().intValue());
}
this.gostParams = pubKey.getGostParams();
publicKey = getPublicKeyDetails(pubKey);
}
public BCECGOST3410PrivateKey(
String algorithm,
ECPrivateKeyParameters params)
{
this.algorithm = algorithm;
this.d = params.getD();
this.ecSpec = null;
}
BCECGOST3410PrivateKey(
PrivateKeyInfo info)
throws IOException
{
populateFromPrivKeyInfo(info);
}
private void populateFromPrivKeyInfo(PrivateKeyInfo info)
throws IOException
{
ASN1Primitive p = info.getPrivateKeyAlgorithm().getParameters().toASN1Primitive();
if (p instanceof ASN1Sequence && (ASN1Sequence.getInstance(p).size() == 2 || ASN1Sequence.getInstance(p).size() == 3))
{
GOST3410PublicKeyAlgParameters gParams = GOST3410PublicKeyAlgParameters.getInstance(info.getPrivateKeyAlgorithm().getParameters());
gostParams = gParams;
ECNamedCurveParameterSpec spec = ECGOST3410NamedCurveTable.getParameterSpec(ECGOST3410NamedCurves.getName(gParams.getPublicKeyParamSet()));
ECCurve curve = spec.getCurve();
EllipticCurve ellipticCurve = EC5Util.convertCurve(curve, spec.getSeed());
ecSpec = new ECNamedCurveSpec(
ECGOST3410NamedCurves.getName(gParams.getPublicKeyParamSet()),
ellipticCurve,
new ECPoint(
spec.getG().getAffineXCoord().toBigInteger(),
spec.getG().getAffineYCoord().toBigInteger()),
spec.getN(), spec.getH());
ASN1Encodable privKey = info.parsePrivateKey();
if (privKey instanceof ASN1Integer)
{
this.d = ASN1Integer.getInstance(privKey).getPositiveValue();
}
else
{
byte[] encVal = ASN1OctetString.getInstance(privKey).getOctets();
byte[] dVal = new byte[encVal.length];
for (int i = 0; i != encVal.length; i++)
{
dVal[i] = encVal[encVal.length - 1 - i];
}
this.d = new BigInteger(1, dVal);
}
}
else
{
// for backwards compatibility
X962Parameters params = X962Parameters.getInstance(info.getPrivateKeyAlgorithm().getParameters());
if (params.isNamedCurve())
{
ASN1ObjectIdentifier oid = ASN1ObjectIdentifier.getInstance(params.getParameters());
X9ECParameters ecP = ECUtil.getNamedCurveByOid(oid);
if (ecP == null) // GOST Curve
{
ECDomainParameters gParam = ECGOST3410NamedCurves.getByOID(oid);
EllipticCurve ellipticCurve = EC5Util.convertCurve(gParam.getCurve(), gParam.getSeed());
ecSpec = new ECNamedCurveSpec(
ECGOST3410NamedCurves.getName(oid),
ellipticCurve,
new ECPoint(
gParam.getG().getAffineXCoord().toBigInteger(),
gParam.getG().getAffineYCoord().toBigInteger()),
gParam.getN(),
gParam.getH());
}
else
{
EllipticCurve ellipticCurve = EC5Util.convertCurve(ecP.getCurve(), 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;
}
else
{
X9ECParameters ecP = X9ECParameters.getInstance(params.getParameters());
EllipticCurve ellipticCurve = EC5Util.convertCurve(ecP.getCurve(), ecP.getSeed());
this.ecSpec = new ECParameterSpec(
ellipticCurve,
new ECPoint(
ecP.getG().getAffineXCoord().toBigInteger(),
ecP.getG().getAffineYCoord().toBigInteger()),
ecP.getN(),
ecP.getH().intValue());
}
ASN1Encodable privKey = info.parsePrivateKey();
if (privKey instanceof ASN1Integer)
{
ASN1Integer derD = ASN1Integer.getInstance(privKey);
this.d = derD.getValue();
}
else
{
org.spongycastle.asn1.sec.ECPrivateKey ec = org.spongycastle.asn1.sec.ECPrivateKey.getInstance(privKey);
this.d = ec.getKey();
this.publicKey = ec.getPublicKey();
}
}
}
public String getAlgorithm()
{
return algorithm;
}
/**
* return the encoding format we produce in getEncoded().
*
* @return the string "PKCS#8"
*/
public String getFormat()
{
return "PKCS#8";
}
/**
* Return a PKCS8 representation of the key. The sequence returned
* represents a full PrivateKeyInfo object.
*
* @return a PKCS8 representation of the key.
*/
public byte[] getEncoded()
{
if (gostParams != null)
{
byte[] encKey = new byte[32];
extractBytes(encKey, 0, this.getS());
try
{
PrivateKeyInfo info = new PrivateKeyInfo(new AlgorithmIdentifier(CryptoProObjectIdentifiers.gostR3410_2001, gostParams), new DEROctetString(encKey));
return info.getEncoded(ASN1Encoding.DER);
}
catch (IOException e)
{
return null;
}
}
else
{
X962Parameters params;
int orderBitLength;
if (ecSpec instanceof ECNamedCurveSpec)
{
ASN1ObjectIdentifier curveOid = ECUtil.getNamedCurveOid(((ECNamedCurveSpec)ecSpec).getName());
if (curveOid == null) // guess it's the OID
{
curveOid = new ASN1ObjectIdentifier(((ECNamedCurveSpec)ecSpec).getName());
}
params = new X962Parameters(curveOid);
orderBitLength = ECUtil.getOrderBitLength(BouncyCastleProvider.CONFIGURATION, ecSpec.getOrder(), this.getS());
}
else if (ecSpec == null)
{
params = new X962Parameters(DERNull.INSTANCE);
orderBitLength = ECUtil.getOrderBitLength(BouncyCastleProvider.CONFIGURATION, null, this.getS());
}
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);
orderBitLength = ECUtil.getOrderBitLength(BouncyCastleProvider.CONFIGURATION, ecSpec.getOrder(), this.getS());
}
PrivateKeyInfo info;
org.spongycastle.asn1.sec.ECPrivateKey keyStructure;
if (publicKey != null)
{
keyStructure = new org.spongycastle.asn1.sec.ECPrivateKey(orderBitLength, this.getS(), publicKey, params);
}
else
{
keyStructure = new org.spongycastle.asn1.sec.ECPrivateKey(orderBitLength, this.getS(), params);
}
try
{
info = new PrivateKeyInfo(new AlgorithmIdentifier(CryptoProObjectIdentifiers.gostR3410_2001, params.toASN1Primitive()), keyStructure.toASN1Primitive());
return info.getEncoded(ASN1Encoding.DER);
}
catch (IOException e)
{
return null;
}
}
}
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)
{
return null;
}
return EC5Util.convertSpec(ecSpec, withCompression);
}
org.spongycastle.jce.spec.ECParameterSpec engineGetSpec()
{
if (ecSpec != null)
{
return EC5Util.convertSpec(ecSpec, withCompression);
}
return BouncyCastleProvider.CONFIGURATION.getEcImplicitlyCa();
}
public BigInteger getS()
{
return d;
}
public BigInteger getD()
{
return d;
}
public void setBagAttribute(
ASN1ObjectIdentifier oid,
ASN1Encodable attribute)
{
attrCarrier.setBagAttribute(oid, attribute);
}
public ASN1Encodable getBagAttribute(
ASN1ObjectIdentifier oid)
{
return attrCarrier.getBagAttribute(oid);
}
public Enumeration getBagAttributeKeys()
{
return attrCarrier.getBagAttributeKeys();
}
public void setPointFormat(String style)
{
withCompression = !("UNCOMPRESSED".equalsIgnoreCase(style));
}
public boolean equals(Object o)
{
if (!(o instanceof BCECGOST3410PrivateKey))
{
return false;
}
BCECGOST3410PrivateKey other = (BCECGOST3410PrivateKey)o;
return getD().equals(other.getD()) && (engineGetSpec().equals(other.engineGetSpec()));
}
public int hashCode()
{
return getD().hashCode() ^ engineGetSpec().hashCode();
}
public String toString()
{
return ECUtil.privateKeyToString(algorithm, d, engineGetSpec());
}
private DERBitString getPublicKeyDetails(BCECGOST3410PublicKey pub)
{
try
{
SubjectPublicKeyInfo info = SubjectPublicKeyInfo.getInstance(ASN1Primitive.fromByteArray(pub.getEncoded()));
return info.getPublicKeyData();
}
catch (IOException e)
{ // should never happen
return null;
}
}
private void readObject(
ObjectInputStream in)
throws IOException, ClassNotFoundException
{
in.defaultReadObject();
byte[] enc = (byte[])in.readObject();
populateFromPrivKeyInfo(PrivateKeyInfo.getInstance(ASN1Primitive.fromByteArray(enc)));
this.attrCarrier = new PKCS12BagAttributeCarrierImpl();
}
private void writeObject(
ObjectOutputStream out)
throws IOException
{
out.defaultWriteObject();
out.writeObject(this.getEncoded());
}
}