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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 to JDK 1.7. Note: this package includes the IDEA and NTRU encryption algorithms.

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package org.bouncycastle.asn1.eac;

import java.util.Hashtable;

public class BidirectionalMap extends Hashtable{
	private static final long serialVersionUID = -7457289971962812909L;
	
	Hashtable reverseMap = new Hashtable();
	
	public Object getReverse(Object o)
	{
		return reverseMap.get(o);
	}
	
	public Object put(Object key, Object o)
	{
		reverseMap.put(o, key);
		return super.put(key, o);
	}
	
}