}
        try {
            md5 = MessageDigest.getInstance("MD5");
        } catch (Exception ex) {
            throw new IllegalStateException(ex.getMessage());
        }
        engineReset();
    }

    private HMACT64(HMACT64 hmac) throws CloneNotSupportedException {
        super("HMACT64");
        this.ipad = hmac.ipad;
        this.opad = hmac.opad;

        }
        for ( int i = length; i < BLOCK_LENGTH; i++ ) {
            this.ipad[ i ] = IPAD;
            this.opad[ i ] = OPAD;
        }

        this.md5 = Crypto.getMD5();
        engineReset();
    }


    private HMACT64 ( HMACT64 hmac ) throws CloneNotSupportedException {
        super("HMACT64");
        this.ipad = hmac.ipad;
        this.opad = hmac.opad;

     */
    private int[] X = new int[16];


// Constructors
//...........................................................................

    public MD4 () {
        super("MD4");
        engineReset();
    }

    /**
     *    This constructor is here to implement cloneability of this class.
     */
    private MD4 (MD4 md) {
        this();
        context = (int[])md.context.clone();