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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;
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;
    }
}