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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.tls;

import java.io.IOException;

import org.spongycastle.tls.crypto.TlsCertificate;
import org.spongycastle.tls.crypto.TlsSecret;

/**
 * Support interface for generating a secret based on the credentials sent by a TLS peer.
 */
public interface TlsCredentialedAgreement
    extends TlsCredentials
{
    /**
     * Calculate an agreed secret based on our credentials and the public key credentials of our peer.
     *
     * @param peerCertificate public key certificate of our TLS peer.
     * @return the agreed secret.
     * @throws IOException in case of an exception on generation of the secret.
     */
    TlsSecret generateAgreement(TlsCertificate peerCertificate) throws IOException;
}