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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.InputStream;

import org.bouncycastle.operator.DigestCalculator;

/**
 * Generic class for processing an InputStream of data RFC 4998 ERS.
 */
public class ERSInputStreamData
    extends ERSCachingData
{
    private final InputStream content;

    public ERSInputStreamData(File content)
        throws FileNotFoundException
    {
        if (content.isDirectory())
        {
            throw new IllegalArgumentException("directory not allowed");
        }
        this.content = new FileInputStream(content);
    }

    public ERSInputStreamData(InputStream content)
    {
        this.content = content;
    }
    
    protected byte[] calculateHash(DigestCalculator digestCalculator, byte[] previousChainHash)
    {
        byte[] hash = ERSUtil.calculateDigest(digestCalculator, content);

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

        return hash;
    }
}