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.cert.crmf;

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


Generic interface for a CertificateRequestMessage control value.

/**
 * Generic interface for a CertificateRequestMessage control value.
 */
public interface Control
{
    
Return the type of this control.

Returns:an ASN1ObjectIdentifier representing the type.
/**
     * Return the type of this control.
     *
     * @return an ASN1ObjectIdentifier representing the type.
     */
    ASN1ObjectIdentifier getType();

    
Return the value contained in this control object.

Returns:the value of the control.
/**
     * Return the value contained in this control object.
     *
     * @return the value of the control.
     */
    ASN1Encodable getValue();
}