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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 2.73.6 for Java 8 and later.

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package org.bouncycastle.crypto.params;

import java.math.BigInteger;

public class ECPrivateKeyParameters
    extends ECKeyParameters
{
    private final BigInteger d;

    public ECPrivateKeyParameters(
        BigInteger          d,
        ECDomainParameters  parameters)
    {
        super(true, parameters);

        this.d = parameters.validatePrivateScalar(d);
    }

    public BigInteger getD()
    {
        return d;
    }
}