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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;

/**
 * General interface for an ERSData data group object.
 */
public interface ERSData
{
    /**
     * Return the calculated hash for the Data
     *
     * @param digestCalculator  digest calculator to use.
     * @param previousChainHash hash from an earlier chain if it needs to be included.
     * @return calculated hash.
     */
    byte[] getHash(DigestCalculator digestCalculator, byte[] previousChainHash);
}