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The Long Term Stable (LTS) Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains the JCA/JCE provider and low-level API for the BC LTS version 2.73.7 for Java 8 and later.

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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);
    }
}