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Kiwi is a utility library. We really like Google's Guava, and also use Apache Commons. But if they don't have something we need, and we think it is useful, this is where we put it.

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package org.kiwiproject.security;

import lombok.Getter;

/**
 * Protocols thar can be used when calling {@link javax.net.ssl.SSLContext#getInstance(String)}.
 *
 * @implNote These are from the Java 11 documentation, specifically from
 * "Java Security Standard Algorithm Names" except protocols that are no longer supported such as SSL (any version).
 */
public enum SSLContextProtocol {

    /**
     * Supports some version of TLS; may support other SSL/TLS versions
     */
    TLS("TLS"),

    /**
     * Supports RFC 2246; TLS version 1.0; may support other SSL/TLS versions
     */
    TLS_1("TLSv1"),

    /**
     * Supports RFC 4346; TLS version 1.1; may support other SSL/TLS versions
     */
    TLS_1_1("TLSv1.1."),

    /**
     * Supports RFC 5246; TLS version 1.2; may support other SSL/TLS versions
     */
    TLS_1_2("TLSv1.2"),

    /**
     * Supports RFC 8446; TLS version 1.3; may support other SSL/TLS versions
     */
    TLS_1_3("TLSv1.3"),

    /**
     * Supports the default provider-dependent versions of DTLS versions
     */
    DTLS("DTLS"),

    /**
     * Supports RFC 4347; DTLS version 1.0; may support other DTLS versions
     */
    DTLS_1_0("DTLSv1.0"),

    /**
     * Supports RFC 6347; DTLS version 1.2; may support other DTLS versions
     */
    DTLS_1_2("DTLSv1.2");

    /**
     * The protocol name that can be directly supplied to {@link javax.net.ssl.SSLContext#getInstance(String)}.
     */
    @Getter
    public final String value;

    SSLContextProtocol(String value) {
        this.value = value;
    }
}