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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for Android. Android ships with a stripped-down version of Bouncy Castle - this causes classloader collisions if you try to add an alternative (updated/complete) Bouncy Castle jar. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5.

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package org.spongycastle.asn1.ess;

import org.spongycastle.asn1.ASN1Encodable;
import org.spongycastle.asn1.ASN1OctetString;
import org.spongycastle.asn1.DERObject;
import org.spongycastle.asn1.DEROctetString;

public class ContentIdentifier
    extends ASN1Encodable
{
     ASN1OctetString value;

    public static ContentIdentifier getInstance(Object o)
    {
        if (o == null || o instanceof ContentIdentifier)
        {
            return (ContentIdentifier) o;
        }
        else if (o instanceof ASN1OctetString)
        {
            return new ContentIdentifier((ASN1OctetString) o);
        }

        throw new IllegalArgumentException(
                "unknown object in 'ContentIdentifier' factory : "
                        + o.getClass().getName() + ".");
    }

    /**
     * Create from OCTET STRING whose octets represent the identifier.
     */
    public ContentIdentifier(
        ASN1OctetString value)
    {
        this.value = value;
    }

    /**
     * Create from byte array representing the identifier.
     */
    public ContentIdentifier(
        byte[] value)
    {
        this(new DEROctetString(value));
    }
    
    public ASN1OctetString getValue()
    {
        return value;
    }

    /**
     * The definition of ContentIdentifier is
     *      * ContentIdentifier ::=  OCTET STRING
     * 
     * id-aa-contentIdentifier OBJECT IDENTIFIER ::= { iso(1)
     *  member-body(2) us(840) rsadsi(113549) pkcs(1) pkcs9(9)
     *  smime(16) id-aa(2) 7 }
     */
    public DERObject toASN1Object()
    {
        return value;
    }
}