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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 org.bouncycastle.operator.DigestCalculator;

/**
 * Generic class for holding byte[] data for RFC 4998 ERS.
 */
public class ERSByteData
    extends ERSCachingData
{
    private final byte[] content;

    public ERSByteData(byte[] 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;
    }
}