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. 
package org.bouncycastle.crypto.tls;

public class DigestAlgorithm
{
    /*
     * Note that the values here are implementation-specific and arbitrary.
     * It is recommended not to depend on the particular values (e.g. serialization).
     */
    public static final int NULL = 0;
    public static final int MD5 = 1;
    public static final int SHA = 2;

    /*
     * RFC 5289
     */
    public static final int SHA256 = 3;
    public static final int SHA384 = 4;
}