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The Bouncy Castle Java APIs for TLS and DTLS.

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package org.bouncycastle.tls;

/**
 * RFC 2246
 * 
 * Note that the values here are implementation-specific and arbitrary. It is recommended not to
 * depend on the particular values (e.g. serialization).
 */
public class KeyExchangeAlgorithm
{
    /*
     * NOTE: We interpret TLS 1.3 cipher suites as having a NULL key exchange
     */
    public static final int NULL = 0;

    public static final int RSA = 1;
    public static final int RSA_EXPORT = 2;
    public static final int DHE_DSS = 3;
    public static final int DHE_DSS_EXPORT = 4;
    public static final int DHE_RSA = 5;
    public static final int DHE_RSA_EXPORT = 6;
    public static final int DH_DSS = 7;
    public static final int DH_DSS_EXPORT = 8;
    public static final int DH_RSA = 9;
    public static final int DH_RSA_EXPORT = 10;
    public static final int DH_anon = 11;
    public static final int DH_anon_EXPORT = 12;

    /*
     * RFC 4279
     */
    public static final int PSK = 13;
    public static final int DHE_PSK = 14;
    public static final int RSA_PSK = 15;

    /*
     * RFC 4429
     */
    public static final int ECDH_ECDSA = 16;
    public static final int ECDHE_ECDSA = 17;
    public static final int ECDH_RSA = 18;
    public static final int ECDHE_RSA = 19;
    public static final int ECDH_anon = 20;

    /*
     * RFC 5054
     */
    public static final int SRP = 21;
    public static final int SRP_DSS = 22;
    public static final int SRP_RSA = 23;
    
    /*
     * RFC 5489
     */
    public static final int ECDHE_PSK = 24;

    /*
     * GMT 0024-2014
     */
    public static final int SM2 = 25;

    public static boolean isAnonymous(int keyExchangeAlgorithm)
    {
        switch (keyExchangeAlgorithm)
        {
        case DH_anon:
        case DH_anon_EXPORT:
        case ECDH_anon:
            return true;
        default:
            return false;
        }
    }
}