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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 and up.

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package org.bouncycastle.asn1;

/**
 * Marker interface for CHOICE objects - if you implement this in a role your
 * own object any attempt to tag the object implicitly will convert the tag to
 * an explicit one as the encoding rules require.
 * 
 * If you use this interface your class should also implement the getInstance()
 * pattern which takes a tag object and the tagging mode used.
 * 
 * X.690
 * 8: Basic encoding rules
 * 8.13 Encoding of a choice value 
 * 
 * The encoding of a choice value shall be the same as the encoding of a value of the chosen type.
 * 

 * NOTE 1 — The encoding may be primitive or constructed depending on the chosen type.
 * 
 * 
 * NOTE 2 — The tag used in the identifier octets is the tag of the chosen type,
 * as specified in the ASN.1 definition of the choice type.
 * 
 */
public interface ASN1Choice
{
    // marker interface
}