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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.

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package org.bouncycastle.x509.extension;

import java.io.IOException;

import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1InputStream;
import org.bouncycastle.asn1.ASN1OctetString;


public class X509ExtensionUtil
{
    public static ASN1Encodable fromExtensionValue(
        byte[]  encodedValue) 
        throws IOException
    {
        ASN1InputStream aIn = new ASN1InputStream(encodedValue);
        
        aIn = new ASN1InputStream(((ASN1OctetString)aIn.readObject()).getOctets());
        
        return (ASN1Encodable)aIn.readObject();
    }
}