http://www.bouncycastle.org/java.html: The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5 to JDK 1.8.
  • The Legion of the Bouncy Castle Inc. 
package org.bouncycastle.jce.interfaces;

import java.util.Enumeration;

import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;


allow us to set attributes on objects that can go into a PKCS12 store.

/**
 * allow us to set attributes on objects that can go into a PKCS12 store.
 */
public interface PKCS12BagAttributeCarrier
{
    void setBagAttribute(
        ASN1ObjectIdentifier oid,
        ASN1Encodable attribute);

    ASN1Encodable getBagAttribute(
        ASN1ObjectIdentifier oid);

    Enumeration getBagAttributeKeys();
}