http://www.bouncycastle.org/java.html: 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 1.5 to JDK 1.8.
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package org.bouncycastle.crypto.tls;


RFC 5246


Note that the values here are implementation-specific and arbitrary. It is recommended not to
depend on the particular values (e.g. serialization).

/**
 * RFC 5246
 * <p>
 * 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 PRFAlgorithm
{
    /*
     * Placeholder to refer to the legacy TLS algorithm
     */
    public static final int tls_prf_legacy = 0;

    public static final int tls_prf_sha256 = 1;

    /*
     * Implied by RFC 5288
     */
    public static final int tls_prf_sha384 = 2;
}