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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 1.8 and up.

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package org.bouncycastle.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;
    }
}