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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.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;
    }
}