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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;
import org.bouncycastle.util.io.Streams;

/**
 * Generic class for processing an InputStream of data RFC 4998 ERS.
 */
public class ERSInputStreamData
    extends ERSCachingData
{
    private final File contentFile;
    private final byte[] contentBytes;

    public ERSInputStreamData(File content)
        throws FileNotFoundException
    {
        if (content.isDirectory())
        {
            throw new IllegalArgumentException("directory not allowed");
        }
        if (!content.exists())
        {
            throw new FileNotFoundException(content + " not found");
        }
        this.contentBytes = null;
        this.contentFile = content;
    }

    public ERSInputStreamData(InputStream content)
    {
        try
        {
            this.contentBytes = Streams.readAll(content);
        }
        catch (IOException e)
        {
            throw ExpUtil.createIllegalState("unable to open content: " + e.getMessage(), e);
        }
        this.contentFile = null;
    }
    
    protected byte[] calculateHash(DigestCalculator digestCalculator, byte[] previousChainHash)
    {
        byte[] hash;
        if (contentBytes != null)
        {
            hash = ERSUtil.calculateDigest(digestCalculator, contentBytes);
        }
        else
        {
            try
            {
                InputStream content = new FileInputStream(contentFile);
                hash = ERSUtil.calculateDigest(digestCalculator, content);
                content.close();
            }
            catch (IOException e)
            {
                throw ExpUtil.createIllegalState("unable to open content: " + e.getMessage(), e);
            }
        }

        if (previousChainHash != null)
        {
            return ERSUtil.concatPreviousHashes(digestCalculator, previousChainHash, hash);
        }

        return hash;
    }
}