CryptoPermissionCollection() 
{
        permissions = new Vector(3);
}

Creates an empty CryptoPermissionCollection object.

 public  void add(Permission permission) 
{
        if (isReadOnly())
            throw new SecurityException("attempt to add a Permission " +
                                        "to a readonly PermissionCollection");
        if (!(permission instanceof CryptoPermission))
            return;
        permissions.addElement(permission);
}

Adds a permission to the CryptoPermissionCollection.

 public Enumeration elements() 
{
        return permissions.elements();
}

Returns an enumeration of all the CryptoPermission objects in the container.

 public boolean implies(Permission permission) 
{
        if (!(permission instanceof CryptoPermission))
            return false;
        CryptoPermission cp = (CryptoPermission)permission;
        Enumeration e = permissions.elements();
        while (e.hasMoreElements()) {
            CryptoPermission x = (CryptoPermission) e.nextElement();
            if (x.implies(cp)) {
                return true;
            }
        }
        return false;
}

Check and see if this CryptoPermission object implies the given Permission object.