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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 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 and used appropriately.

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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;
}