java hmac/sha512 generation

Question

I have this php code which generate a HMAC (and not a simple message digest):

Answer 1

I use this for SHA 512 in Java. It might help:

public static String sha512 ( String str )
    {
        try
        {
            return sha512 ( str.getBytes ( "UTF-8" ) );
        }
        catch ( UnsupportedEncodingException e )
        {
            e.printStackTrace ( );
            return "";
        }
    }

public static String sha512 ( byte[] array )
{
    try
    {
        MessageDigest m = MessageDigest.getInstance ( "SHA-512" );
        m.update ( array );
        String hash = new BigInteger ( 1, m.digest ( ) ).toString ( 16 );
        while ( hash.length ( ) < 32 )
        {
            hash = "0" + hash;
        }
        return hash;
    }
    catch ( NoSuchAlgorithmException e )
    {
        e.printStackTrace ( );
        return "";
    }
}

I also remember that there is detailed answer about MD-5 in a post in stackoverflow (just the algorythm is different)