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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;

import java.math.BigInteger;

/**
 * Class representing an element of Z[τ]. Let
 * λ be an element of Z[τ]. Then
 * λ is given as λ = u + vτ. The
 * components u and v may be used directly, there
 * are no accessor methods.
 * Immutable class.
 */
class ZTauElement
{
    /**
     * The "real" part of λ.
     */
    public final BigInteger u;

    /**
     * The "τ-adic" part of λ.
     */
    public final BigInteger v;

    /**
     * Constructor for an element λ of
     * Z[τ].
     * @param u The "real" part of λ.
     * @param v The "τ-adic" part of
     * λ.
     */
    public ZTauElement(BigInteger u, BigInteger v)
    {
        this.u = u;
        this.v = v;
    }
}