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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 1.8. Note: this package includes the NTRU encryption algorithms.

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package org.bouncycastle.crypto.tls;

/*
 * draft-ietf-tls-negotiated-ff-dhe-01
 */
public class FiniteFieldDHEGroup
{
    public static final short ffdhe2432 = 0;
    public static final short ffdhe3072 = 1;
    public static final short ffdhe4096 = 2;
    public static final short ffdhe6144 = 3;
    public static final short ffdhe8192 = 4;

    public static boolean isValid(short group)
    {
        return group >= ffdhe2432 && group <= ffdhe8192;
    }
}