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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.8 and up. The APIs are designed primarily to be used in conjunction with the BC LTS provider but may also be used with other providers providing cryptographic services.

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package org.bouncycastle.cms;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.cms.CMSObjectIdentifiers;
import org.bouncycastle.util.io.Streams;

/**
 * a holding class for a file of data to be processed.
 */
public class CMSProcessableFile
    implements CMSTypedData, CMSReadable
{
    private static final int DEFAULT_BUF_SIZE = 32 * 1024;

    private final ASN1ObjectIdentifier type;
    private final File file;
    private final int bufSize;

    public CMSProcessableFile(
        File file)
    {
        this(file, DEFAULT_BUF_SIZE);
    }
    
    public CMSProcessableFile(
        File file,
        int  bufSize)
    {
        this(CMSObjectIdentifiers.data, file, bufSize);
    }

    public CMSProcessableFile(
        ASN1ObjectIdentifier type,
        File file,
        int  bufSize)
    {
        this.type = type;
        this.file = file;
        this.bufSize = bufSize;
    }

    public InputStream getInputStream()
        throws IOException, CMSException
    {
        return new BufferedInputStream(new FileInputStream(file), bufSize);
    }

    public void write(OutputStream zOut)
        throws IOException, CMSException
    {
        FileInputStream fIn = new FileInputStream(file);
        Streams.pipeAll(fIn, zOut, bufSize);
        fIn.close();
    }

    /**
     * Return the file handle.
     */
    public Object getContent()
    {
        return file;
    }

    public ASN1ObjectIdentifier getContentType()
    {
        return type;
    }
}