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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for the Android platform. Android unfortunately ships with a stripped-down version of Bouncy Castle, which prevents easy upgrades - Spongy Castle overcomes this and provides a full, up-to-date version of the Bouncy Castle cryptographic libs.

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package org.spongycastle.asn1.cms;

import java.io.IOException;

import org.spongycastle.asn1.ASN1Encodable;
import org.spongycastle.asn1.ASN1ObjectIdentifier;
import org.spongycastle.asn1.ASN1SequenceParser;
import org.spongycastle.asn1.ASN1TaggedObjectParser;

/**
 * RFC 5652 {@link ContentInfo} object parser.
 *
 *  * ContentInfo ::= SEQUENCE {
 *     contentType ContentType,
 *     content [0] EXPLICIT ANY DEFINED BY contentType OPTIONAL }
 * 
 */
public class ContentInfoParser
{
    private ASN1ObjectIdentifier contentType;
    private ASN1TaggedObjectParser content;

    public ContentInfoParser(
        ASN1SequenceParser seq)
        throws IOException
    {
        contentType = (ASN1ObjectIdentifier)seq.readObject();
        content = (ASN1TaggedObjectParser)seq.readObject();
    }

    public ASN1ObjectIdentifier getContentType()
    {
        return contentType;
    }

    public ASN1Encodable getContent(
        int  tag)
        throws IOException
    {
        if (content != null)
        {
            return content.getObjectParser(tag, true);
        }

        return null;
    }
}