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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 1.5 to JDK 1.8. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.

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package org.bouncycastle.tsp.ers;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;

import org.bouncycastle.operator.DigestCalculator;

/**
 * Generic class for holding a File of data for RFC 4998 ERS.
 */
public class ERSFileData
    extends ERSCachingData
{
    private final File content;

    public ERSFileData(File content)
        throws FileNotFoundException
    {
        if (content.isDirectory())
        {
            throw new IllegalArgumentException("directory not allowed as ERSFileData");
        }
        if (!content.exists())
        {
            throw new FileNotFoundException(content.getAbsolutePath() + " does not exist");
        }
        if (!content.canRead())
        {
            throw new FileNotFoundException(content.getAbsolutePath() + " is not readable");
        }
        this.content = content;
    }

    protected byte[] calculateHash(DigestCalculator digestCalculator)
    {
        try
        {
            InputStream contentStream = new FileInputStream(content);
            byte[] hash = ERSUtil.calculateDigest(digestCalculator, contentStream);
            contentStream.close();

            return hash;
        }
        catch (IOException e)
        {
            throw new IllegalStateException("unable to process " + content.getAbsolutePath());
        }
    }
}