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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.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;
    }
}