package org.bouncycastle.jcajce.provider.asymmetric.gost;
import java.io.IOException;
import java.security.spec.AlgorithmParameterSpec;
import java.security.spec.InvalidParameterSpecException;
import org.bouncycastle.asn1.ASN1Encoding;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.cryptopro.GOST3410PublicKeyAlgParameters;
import org.bouncycastle.jce.spec.GOST3410ParameterSpec;
import org.bouncycastle.jce.spec.GOST3410PublicKeyParameterSetSpec;
public class AlgorithmParametersSpi
extends java.security.AlgorithmParametersSpi
{
GOST3410ParameterSpec currentSpec;
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);
}
/**
* Return the X.509 ASN.1 structure GOST3410Parameter.
* <p/>
* <pre>
* GOST3410Parameter ::= SEQUENCE {
* prime INTEGER, -- p
* subprime INTEGER, -- q
* base INTEGER, -- a}
* </pre>
*/
protected byte[] engineGetEncoded()
{
GOST3410PublicKeyAlgParameters gost3410P = new GOST3410PublicKeyAlgParameters(new ASN1ObjectIdentifier(currentSpec.getPublicKeyParamSetOID()), new ASN1ObjectIdentifier(currentSpec.getDigestParamSetOID()), new ASN1ObjectIdentifier(currentSpec.getEncryptionParamSetOID()));
try
{
return gost3410P.getEncoded(ASN1Encoding.DER);
}
catch (IOException e)
{
throw new RuntimeException("Error encoding GOST3410Parameters");
}
}
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 == GOST3410PublicKeyParameterSetSpec.class)
{
return currentSpec;
}
throw new InvalidParameterSpecException("unknown parameter spec passed to GOST3410 parameters object.");
}
protected void engineInit(
AlgorithmParameterSpec paramSpec)
throws InvalidParameterSpecException
{
if (!(paramSpec instanceof GOST3410ParameterSpec))
{
throw new InvalidParameterSpecException("GOST3410ParameterSpec required to initialise a GOST3410 algorithm parameters object");
}
this.currentSpec = (GOST3410ParameterSpec)paramSpec;
}
protected void engineInit(
byte[] params)
throws IOException
{
try
{
ASN1Sequence seq = (ASN1Sequence)ASN1Primitive.fromByteArray(params);
this.currentSpec = GOST3410ParameterSpec.fromPublicKeyAlg(
new GOST3410PublicKeyAlgParameters(seq));
}
catch (ClassCastException e)
{
throw new IOException("Not a valid GOST3410 Parameter encoding.");
}
catch (ArrayIndexOutOfBoundsException e)
{
throw new IOException("Not a valid GOST3410 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 "GOST3410 Parameters";
}
}