org.bouncycastle.tsp.ers.ERSFileData Maven / Gradle / Ivy

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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. The APIs are designed primarily to be used in conjunction with the BC FIPS provider. The APIs may also be used with other providers although if being used in a FIPS context it is the responsibility of the user to ensure that any other providers used are FIPS certified.

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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());
        }
    }
}