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The Bouncy Castle Java APIs for the OpenPGP Protocol. 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.openpgp.operator;

import org.bouncycastle.bcpg.HashAlgorithmTags;
import org.bouncycastle.openpgp.PGPException;

/**
 * A factory for digest algorithms.
 */
public interface PGPDigestCalculatorProvider
{
    /**
     * Construct a new instance of a cryptographic digest.
     * 
     * @param algorithm the identifier of the {@link HashAlgorithmTags digest algorithm} to
     *            instantiate.
     * @return a digest calculator for the specified algorithm.
     * @throws PGPException if an error occurs constructing the specified digest.
     */
    PGPDigestCalculator get(int algorithm)
        throws PGPException;
}