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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for the Android platform. Android unfortunately ships with a stripped-down version of Bouncy Castle, which prevents easy upgrades - Spongy Castle overcomes this and provides a full, up-to-date version of the Bouncy Castle cryptographic libs.

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package org.spongycastle.math.ec;

public class ScaleYPointMap implements ECPointMap
{
    protected final ECFieldElement scale;

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

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