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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for Android. Android ships with a stripped-down version of Bouncy Castle - this causes classloader collisions if you try to add an alternative (updated/complete) Bouncy Castle jar. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5.

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package org.spongycastle.operator;

import org.spongycastle.asn1.x509.AlgorithmIdentifier;

public interface DigestAlgorithmIdentifierFinder
{
    /**
     * Find the digest algorithm identifier that matches with
     * the passed in signature algorithm identifier.
     *
     * @param sigAlgId the signature algorithm of interest.
     * @return an algorithm identifier for the corresponding digest.
     */
    AlgorithmIdentifier find(AlgorithmIdentifier sigAlgId);
}