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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.math.ec;

public class ScaleYNegateXPointMap implements ECPointMap
{
    protected final ECFieldElement scale;

    public ScaleYNegateXPointMap(ECFieldElement scale)
    {
        this.scale = scale;
    }

    public ECPoint map(ECPoint p)
    {
        return p.scaleYNegateX(scale);
    }
}