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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 1.5 to JDK 1.8.
package org.bouncycastle.jcajce.provider.asymmetric.ec;
import java.math.BigInteger;
import java.security.InvalidKeyException;
import java.security.PublicKey;
import java.security.spec.ECGenParameterSpec;
import java.security.spec.ECParameterSpec;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.DERNull;
import org.bouncycastle.asn1.x9.X962Parameters;
import org.bouncycastle.asn1.x9.X9ECParameters;
import org.bouncycastle.asn1.x9.X9ECPoint;
import org.bouncycastle.crypto.params.AsymmetricKeyParameter;
import org.bouncycastle.jcajce.provider.asymmetric.util.EC5Util;
import org.bouncycastle.jcajce.provider.asymmetric.util.ECUtil;
import org.bouncycastle.jce.spec.ECNamedCurveSpec;
import org.bouncycastle.math.ec.ECCurve;
class ECUtils
{
static AsymmetricKeyParameter generatePublicKeyParameter(
PublicKey key)
throws InvalidKeyException
{
return (key instanceof BCECPublicKey) ? ((BCECPublicKey)key).engineGetKeyParameters() : ECUtil.generatePublicKeyParameter(key);
}
static X9ECParameters getDomainParametersFromGenSpec(ECGenParameterSpec genSpec)
{
return getDomainParametersFromName(genSpec.getName());
}
static X9ECParameters getDomainParametersFromName(String curveName)
{
X9ECParameters domainParameters;
try
{
if (curveName.charAt(0) >= '0' && curveName.charAt(0) <= '2')
{
ASN1ObjectIdentifier oidID = new ASN1ObjectIdentifier(curveName);
domainParameters = ECUtil.getNamedCurveByOid(oidID);
}
else
{
if (curveName.indexOf(' ') > 0)
{
curveName = curveName.substring(curveName.indexOf(' ') + 1);
domainParameters = ECUtil.getNamedCurveByName(curveName);
}
else
{
domainParameters = ECUtil.getNamedCurveByName(curveName);
}
}
}
catch (IllegalArgumentException ex)
{
domainParameters = ECUtil.getNamedCurveByName(curveName);
}
return domainParameters;
}
static X962Parameters getDomainParametersFromName(ECParameterSpec ecSpec, boolean withCompression)
{
X962Parameters params;
if (ecSpec instanceof ECNamedCurveSpec)
{
ASN1ObjectIdentifier curveOid = ECUtil.getNamedCurveOid(((ECNamedCurveSpec)ecSpec).getName());
if (curveOid == null)
{
curveOid = new ASN1ObjectIdentifier(((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,
new X9ECPoint(EC5Util.convertPoint(curve, ecSpec.getGenerator()), withCompression),
ecSpec.getOrder(),
BigInteger.valueOf(ecSpec.getCofactor()),
ecSpec.getCurve().getSeed());
params = new X962Parameters(ecP);
}
return params;
}
}
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