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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.5 and up. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.

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package org.bouncycastle.crypto;

public class EphemeralKeyPair
{
    private AsymmetricCipherKeyPair keyPair;
    private KeyEncoder publicKeyEncoder;

    public EphemeralKeyPair(AsymmetricCipherKeyPair keyPair, KeyEncoder publicKeyEncoder)
    {
        this.keyPair = keyPair;
        this.publicKeyEncoder = publicKeyEncoder;
    }

    public AsymmetricCipherKeyPair getKeyPair()
    {
        return keyPair;
    }

    public byte[] getEncodedPublicKey()
    {
        return publicKeyEncoder.getEncoded(keyPair.getPublic());
    }
}