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.cms;

import java.util.Map;

import org.bouncycastle.asn1.cms.AttributeTable;


Note: The SIGNATURE parameter is only available when generating unsigned attributes.

/**
 * Note: The SIGNATURE parameter is only available when generating unsigned attributes.
 */
public interface CMSAttributeTableGenerator
{
    String CONTENT_TYPE = "contentType";
    String DIGEST = "digest";
    String SIGNATURE = "encryptedDigest";
    String DIGEST_ALGORITHM_IDENTIFIER = "digestAlgID";
    String MAC_ALGORITHM_IDENTIFIER = "macAlgID";
    String SIGNATURE_ALGORITHM_IDENTIFIER = "signatureAlgID";

    AttributeTable getAttributes(Map parameters)
        throws CMSAttributeTableGenerationException;
}