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.
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package org.bouncycastle.asn1;


Basic interface to produce serialisers for ASN.1 encodings.

/**
 * Basic interface to produce serialisers for ASN.1 encodings.
 */
public interface ASN1Encodable
{
    
Return an object, possibly constructed, of ASN.1 primitives

Returns:an ASN.1 primitive.
/**
     * Return an object, possibly constructed, of ASN.1 primitives
     * @return an ASN.1 primitive.
     */
    ASN1Primitive toASN1Primitive();
}