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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 1.8 and up. 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.cms;

import org.bouncycastle.asn1.x509.AlgorithmIdentifier;

/**
 * Finder which is used to look up the algorithm identifiers representing the encryption algorithms that
 * are associated with a particular signature algorithm.
 */
public interface CMSSignatureEncryptionAlgorithmFinder
{
    /**
     * Return the encryption algorithm identifier associated with the passed in signatureAlgorithm
     * @param signatureAlgorithm the algorithm identifier of the signature of interest
     * @return  the algorithm identifier to be associated with the encryption algorithm used in signature creation.
     */
    AlgorithmIdentifier findEncryptionAlgorithm(AlgorithmIdentifier signatureAlgorithm);
}