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package org.spongycastle.jcajce.provider.asymmetric.ies;
import java.io.IOException;
import java.security.spec.AlgorithmParameterSpec;
import java.security.spec.InvalidParameterSpecException;
import org.spongycastle.asn1.ASN1EncodableVector;
import org.spongycastle.asn1.ASN1Encoding;
import org.spongycastle.asn1.ASN1Integer;
import org.spongycastle.asn1.ASN1OctetString;
import org.spongycastle.asn1.ASN1Primitive;
import org.spongycastle.asn1.ASN1Sequence;
import org.spongycastle.asn1.DEROctetString;
import org.spongycastle.asn1.DERSequence;
import org.spongycastle.jce.spec.IESParameterSpec;
public class AlgorithmParametersSpi
extends java.security.AlgorithmParametersSpi
{
protected boolean isASN1FormatString(String format)
{
return format == null || format.equals("ASN.1");
}
protected AlgorithmParameterSpec engineGetParameterSpec(
Class paramSpec)
throws InvalidParameterSpecException
{
if (paramSpec == null)
{
throw new NullPointerException("argument to getParameterSpec must not be null");
}
return localEngineGetParameterSpec(paramSpec);
}
IESParameterSpec currentSpec;
/**
* in the absence of a standard way of doing it this will do for
* now...
*/
protected byte[] engineGetEncoded()
{
try
{
ASN1EncodableVector v = new ASN1EncodableVector();
v.add(new DEROctetString(currentSpec.getDerivationV()));
v.add(new DEROctetString(currentSpec.getEncodingV()));
v.add(new ASN1Integer(currentSpec.getMacKeySize()));
return new DERSequence(v).getEncoded(ASN1Encoding.DER);
}
catch (IOException e)
{
throw new RuntimeException("Error encoding IESParameters");
}
}
protected byte[] engineGetEncoded(
String format)
{
if (isASN1FormatString(format) || format.equalsIgnoreCase("X.509"))
{
return engineGetEncoded();
}
return null;
}
protected AlgorithmParameterSpec localEngineGetParameterSpec(
Class paramSpec)
throws InvalidParameterSpecException
{
if (paramSpec == IESParameterSpec.class)
{
return currentSpec;
}
throw new InvalidParameterSpecException("unknown parameter spec passed to ElGamal parameters object.");
}
protected void engineInit(
AlgorithmParameterSpec paramSpec)
throws InvalidParameterSpecException
{
if (!(paramSpec instanceof IESParameterSpec))
{
throw new InvalidParameterSpecException("IESParameterSpec required to initialise a IES algorithm parameters object");
}
this.currentSpec = (IESParameterSpec)paramSpec;
}
protected void engineInit(
byte[] params)
throws IOException
{
try
{
ASN1Sequence s = (ASN1Sequence)ASN1Primitive.fromByteArray(params);
this.currentSpec = new IESParameterSpec(
((ASN1OctetString)s.getObjectAt(0)).getOctets(),
((ASN1OctetString)s.getObjectAt(0)).getOctets(),
((ASN1Integer)s.getObjectAt(0)).getValue().intValue());
}
catch (ClassCastException e)
{
throw new IOException("Not a valid IES Parameter encoding.");
}
catch (ArrayIndexOutOfBoundsException e)
{
throw new IOException("Not a valid IES Parameter encoding.");
}
}
protected void engineInit(
byte[] params,
String format)
throws IOException
{
if (isASN1FormatString(format) || format.equalsIgnoreCase("X.509"))
{
engineInit(params);
}
else
{
throw new IOException("Unknown parameter format " + format);
}
}
protected String engineToString()
{
return "IES Parameters";
}
}
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