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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 and up. 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.operator;

import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.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);

    /**
     * Find the algorithm identifier that matches with
     * the passed in digest name.
     *
     * @param digestOid the name of the digest algorithm of interest.
     * @return an algorithm identifier for the digest signature.
     */
    AlgorithmIdentifier find(ASN1ObjectIdentifier digestOid);

    /**
     * Find the algorithm identifier that matches with
     * the passed in digest name.
     *
     * @param digAlgName the name of the digest algorithm of interest.
     * @return an algorithm identifier for the digest signature.
     */
    AlgorithmIdentifier find(String digAlgName);
}