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

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package org.bouncycastle.crypto.tls;

public class ExtensionType
{
    /*
     * RFC 2546 2.3.
     */
    public static final int server_name = 0;
    public static final int max_fragment_length = 1;
    public static final int client_certificate_url = 2;
    public static final int trusted_ca_keys = 3;
    public static final int truncated_hmac = 4;
    public static final int status_request = 5;

    /*
     * RFC 4681
     */
    public static final int user_mapping = 6;

    /*
     * RFC 5878
     */
    public static final int client_authz = 7;
    public static final int server_authz = 8;

    /*
     * RFC RFC6091
     */
    public static final int cert_type = 9;

    /*
     * draft-ietf-tls-negotiated-ff-dhe-10
     */
    public static final int supported_groups = 10;

    /*
     * RFC 4492 5.1.
     */
    /** @deprecated Use {@link #supported_groups} instead */
    public static final int elliptic_curves = supported_groups;
    public static final int ec_point_formats = 11;

    /*
     * RFC 5054 2.8.1.
     */
    public static final int srp = 12;

    /*
     * RFC 5246 7.4.1.4.
     */
    public static final int signature_algorithms = 13;

    /*
     * RFC 5764 9.
     */
    public static final int use_srtp = 14;

    /*
     * RFC 6520 6.
     */
    public static final int heartbeat = 15;

    /*
     * RFC 7301
     */
    public static final int application_layer_protocol_negotiation = 16;

    /*
     * RFC 6961
     */
    public static final int status_request_v2 = 17;

    /*
     * RFC 6962
     */
    public static final int signed_certificate_timestamp = 18;

    /*
     * RFC 7250
     */
    public static final int client_certificate_type = 19;
    public static final int server_certificate_type = 20;

    /*
     * RFC 7685
     */
    public static final int padding = 21;

    /*
     * RFC 7366
     */
    public static final int encrypt_then_mac = 22;

    /*
     * RFC 7627
     */
    public static final int extended_master_secret = 23;

    /*
     * RFC 5077 7.
     */
    public static final int session_ticket = 35;

    /*
     * draft-ietf-tls-negotiated-ff-dhe-01
     * 
     * WARNING: Placeholder value; the real value is TBA
     */
    public static final int negotiated_ff_dhe_groups = 101;

    /*
     * RFC 5746 3.2.
     */
    public static final int renegotiation_info = 0xff01;
}