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package org.bouncycastle.jcajce.util;
import java.io.IOException;
import java.security.AlgorithmParameters;
import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1Primitive;
/**
* General JCA/JCE utility methods.
*/
public class AlgorithmParametersUtils
{
private AlgorithmParametersUtils()
{
}
/**
* Extract an ASN.1 encodable from an AlgorithmParameters object.
*
* @param params the object to get the encoding used to create the return value.
* @return an ASN.1 object representing the primitives making up the params parameter.
* @throws IOException if an encoding cannot be extracted.
*/
public static ASN1Encodable extractParameters(AlgorithmParameters params)
throws IOException
{
// we try ASN.1 explicitly first just in case and then role back to the default.
ASN1Encodable asn1Params;
try
{
asn1Params = ASN1Primitive.fromByteArray(params.getEncoded("ASN.1"));
}
catch (Exception ex)
{
asn1Params = ASN1Primitive.fromByteArray(params.getEncoded());
}
return asn1Params;
}
/**
* Load an AlgorithmParameters object with the passed in ASN.1 encodable - if possible.
*
* @param params the AlgorithmParameters object to be initialised.
* @param sParams the ASN.1 encodable to initialise params with.
* @throws IOException if the parameters cannot be initialised.
*/
public static void loadParameters(AlgorithmParameters params, ASN1Encodable sParams)
throws IOException
{
// we try ASN.1 explicitly first just in case and then role back to the default.
try
{
params.init(sParams.toASN1Primitive().getEncoded(), "ASN.1");
}
catch (Exception ex)
{
params.init(sParams.toASN1Primitive().getEncoded());
}
}
}
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