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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.jce.interfaces;

/**
 * All BC elliptic curve keys implement this interface. You need to
 * cast the key to get access to it.
 * 
 * By default BC keys produce encodings without point compression,
 * to turn this on call setPointFormat() with "COMPRESSED".
 */
public interface ECPointEncoder
{
    /**
     * Set the formatting for encoding of points. If the String "UNCOMPRESSED" is passed
     * in point compression will not be used. If the String "COMPRESSED" is passed point
     * compression will be used. The default is "UNCOMPRESSED".
     * 
     * @param style the style to use.
     */
    public void setPointFormat(String style);
}