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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 1.5 to JDK 1.7. Note: this package includes the IDEA and NTRU encryption algorithms.

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package org.bouncycastle.crypto.params;

import org.bouncycastle.math.ec.ECPoint;

public class ECPublicKeyParameters
    extends ECKeyParameters
{
    private final ECPoint Q;

    public ECPublicKeyParameters(
        ECPoint             Q,
        ECDomainParameters  params)
    {
        super(false, params);

        this.Q = validate(Q);
    }

    private ECPoint validate(ECPoint q)
    {
        if (q == null)
        {
            throw new IllegalArgumentException("point has null value");
        }

        if (q.isInfinity())
        {
            throw new IllegalArgumentException("point at infinity");
        }

        q = q.normalize();

        if (!q.isValid())
        {
            throw new IllegalArgumentException("point not on curve");
        }

        return q;
    }

    public ECPoint getQ()
    {
        return Q;
    }
}