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.
  • The Legion of the Bouncy Castle Inc. 
package org.bouncycastle.crypto.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).

/**
 * RFC 2246
 * <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 MACAlgorithm
{
    public static final int _null = 0;
    public static final int md5 = 1;
    public static final int sha = 2;

    /*
     * RFC 5246
     */
    public static final int hmac_md5 = md5;
    public static final int hmac_sha1 = sha;
    public static final int hmac_sha256 = 3;
    public static final int hmac_sha384 = 4;
    public static final int hmac_sha512 = 5;
}