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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for the Android platform. Android unfortunately ships with a stripped-down version of Bouncy Castle, which prevents easy upgrades - Spongy Castle overcomes this and provides a full, up-to-date version of the Bouncy Castle cryptographic libs.

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package org.spongycastle.openpgp.operator;

import org.spongycastle.bcpg.HashAlgorithmTags;
import org.spongycastle.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;
}