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The Bouncy Castle Java APIs for the TLS, including a JSSE provider. The APIs are designed primarily to be used in conjunction with the BC LTS provider but may also be used with other providers providing cryptographic services.

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package org.bouncycastle.tls;

import org.bouncycastle.tls.crypto.DHGroup;

/**
 * Interface for verifying explicit Diffie-Hellman group parameters.
 */
public interface TlsDHGroupVerifier
{
    /**
     * Check whether the given DH group is acceptable for use.
     * 
     * @param dhGroup the {@link DHGroup} to check
     * @return true if (and only if) the specified group is acceptable
     */
    boolean accept(DHGroup dhGroup);
}