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/* GENERATED SOURCE. DO NOT MODIFY. */
package com.android.internal.org.bouncycastle.jcajce.provider.asymmetric.ec;
import java.io.IOException;
import java.math.BigInteger;
import java.security.spec.AlgorithmParameterSpec;
import java.security.spec.ECGenParameterSpec;
import java.security.spec.ECParameterSpec;
import java.security.spec.InvalidParameterSpecException;
import com.android.internal.org.bouncycastle.asn1.ASN1ObjectIdentifier;
import com.android.internal.org.bouncycastle.asn1.DERNull;
import com.android.internal.org.bouncycastle.asn1.x9.ECNamedCurveTable;
import com.android.internal.org.bouncycastle.asn1.x9.X962Parameters;
import com.android.internal.org.bouncycastle.asn1.x9.X9ECParameters;
import com.android.internal.org.bouncycastle.asn1.x9.X9ECPoint;
import com.android.internal.org.bouncycastle.jcajce.provider.asymmetric.util.EC5Util;
import com.android.internal.org.bouncycastle.jcajce.provider.asymmetric.util.ECUtil;
import com.android.internal.org.bouncycastle.jce.provider.BouncyCastleProvider;
import com.android.internal.org.bouncycastle.jce.spec.ECNamedCurveSpec;
import com.android.internal.org.bouncycastle.math.ec.ECCurve;
/**
* @hide This class is not part of the Android public SDK API
*/
public class AlgorithmParametersSpi
extends java.security.AlgorithmParametersSpi
{
private ECParameterSpec ecParameterSpec;
private String curveName;
protected boolean isASN1FormatString(String format)
{
return format == null || format.equals("ASN.1");
}
@Override
protected void engineInit(AlgorithmParameterSpec algorithmParameterSpec)
throws InvalidParameterSpecException
{
if (algorithmParameterSpec instanceof ECGenParameterSpec)
{
ECGenParameterSpec ecGenParameterSpec = (ECGenParameterSpec)algorithmParameterSpec;
X9ECParameters params = ECUtils.getDomainParametersFromGenSpec(ecGenParameterSpec);
if (params == null)
{
throw new InvalidParameterSpecException("EC curve name not recognized: " + ecGenParameterSpec.getName());
}
curveName = ecGenParameterSpec.getName();
ECParameterSpec baseSpec = EC5Util.convertToSpec(params);
ecParameterSpec = new ECNamedCurveSpec(curveName,
baseSpec.getCurve(), baseSpec.getGenerator(), baseSpec.getOrder(), BigInteger.valueOf(baseSpec.getCofactor()));
}
else if (algorithmParameterSpec instanceof ECParameterSpec)
{
if (algorithmParameterSpec instanceof ECNamedCurveSpec)
{
curveName = ((ECNamedCurveSpec)algorithmParameterSpec).getName();
}
else
{
curveName = null;
}
ecParameterSpec = (ECParameterSpec)algorithmParameterSpec;
}
else
{
throw new InvalidParameterSpecException("AlgorithmParameterSpec class not recognized: " + algorithmParameterSpec.getClass().getName());
}
}
@Override
protected void engineInit(byte[] bytes)
throws IOException
{
engineInit(bytes, "ASN.1");
}
@Override
protected void engineInit(byte[] bytes, String format)
throws IOException
{
if (isASN1FormatString(format))
{
X962Parameters params = X962Parameters.getInstance(bytes);
ECCurve curve = EC5Util.getCurve(BouncyCastleProvider.CONFIGURATION, params);
if (params.isNamedCurve())
{
ASN1ObjectIdentifier curveId = ASN1ObjectIdentifier.getInstance(params.getParameters());
curveName = ECNamedCurveTable.getName(curveId);
if (curveName == null)
{
curveName = curveId.getId();
}
}
ecParameterSpec = EC5Util.convertToSpec(params, curve);
}
else
{
throw new IOException("Unknown encoded parameters format in AlgorithmParameters object: " + format);
}
}
@Override
protected <T extends AlgorithmParameterSpec> T engineGetParameterSpec(Class<T> paramSpec)
throws InvalidParameterSpecException
{
if (ECParameterSpec.class.isAssignableFrom(paramSpec) || paramSpec == AlgorithmParameterSpec.class)
{
return (T)ecParameterSpec;
}
else if (ECGenParameterSpec.class.isAssignableFrom(paramSpec))
{
if (curveName != null)
{
ASN1ObjectIdentifier namedCurveOid = ECUtil.getNamedCurveOid(curveName);
if (namedCurveOid != null)
{
return (T)new ECGenParameterSpec(namedCurveOid.getId());
}
return (T)new ECGenParameterSpec(curveName);
}
else
{
ASN1ObjectIdentifier namedCurveOid = ECUtil.getNamedCurveOid(EC5Util.convertSpec(ecParameterSpec));
if (namedCurveOid != null)
{
return (T)new ECGenParameterSpec(namedCurveOid.getId());
}
}
}
throw new InvalidParameterSpecException("EC AlgorithmParameters cannot convert to " + paramSpec.getName());
}
@Override
protected byte[] engineGetEncoded()
throws IOException
{
return engineGetEncoded("ASN.1");
}
@Override
protected byte[] engineGetEncoded(String format)
throws IOException
{
if (isASN1FormatString(format))
{
X962Parameters params;
if (ecParameterSpec == null) // implicitly CA
{
params = new X962Parameters(DERNull.INSTANCE);
}
else if (curveName != null)
{
params = new X962Parameters(ECUtil.getNamedCurveOid(curveName));
}
else
{
com.android.internal.org.bouncycastle.jce.spec.ECParameterSpec ecSpec = EC5Util.convertSpec(ecParameterSpec);
X9ECParameters ecP = new X9ECParameters(
ecSpec.getCurve(),
new X9ECPoint(ecSpec.getG(), false),
ecSpec.getN(),
ecSpec.getH(),
ecSpec.getSeed());
params = new X962Parameters(ecP);
}
return params.getEncoded();
}
throw new IOException("Unknown parameters format in AlgorithmParameters object: " + format);
}
@Override
protected String engineToString()
{
return "EC Parameters";
}
}
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