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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 FIPS provider. The APIs may also be used with other providers although if being used in a FIPS context it is the responsibility of the user to ensure that any other providers used are FIPS certified and used appropriately.

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package org.bouncycastle.tls;

public class MaxFragmentLength
{
    /*
     * RFC 3546 3.2.
     */
    public static final short pow2_9 = 1;
    public static final short pow2_10 = 2;
    public static final short pow2_11 = 3;
    public static final short pow2_12 = 4;

    public static boolean isValid(short maxFragmentLength)
    {
        return maxFragmentLength >= pow2_9 && maxFragmentLength <= pow2_12;
    }
}