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

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

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