http://www.bouncycastle.org/java.html: The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.5 to JDK 1.8. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.
  • The Legion of the Bouncy Castle Inc. 
package org.bouncycastle.operator;

import org.bouncycastle.asn1.x509.AlgorithmIdentifier;

public interface DigestAlgorithmIdentifierFinder
{
    
Find the digest algorithm identifier that matches with
the passed in signature algorithm identifier.

Params:
  • sigAlgId – the signature algorithm of interest.
Returns:an algorithm identifier for the corresponding digest.
/**
     * 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.

Params:
  • digAlgName – the name of the digest algorithm of interest.
Returns:an algorithm identifier for the digest signature.
/**
     * 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);
}