password and verify store procedures - not working -

After I exec and create a new user.
then I try to verify it but it is always returning "Failed"

am I doing it right?

----------

USE [SA02012011]
GO
/****** Object:  StoredProcedure [dbo].[pAddUser]    Script Date: 02/28/2011 10:56:10 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER PROCEDURE [dbo].[pAddUser](
      @UserName VARCHAR(20),
      @eMail VARCHAR(20),
      @Algorithm VARCHAR(16),
      @Pass VARCHAR(16)
)
AS
BEGIN
      set nocount on
      
      INSERT INTO PersonID (UserName, eMail, passwordID)
select @UserName, @eMail, hashbytes(@Algorithm,@Pass)
END


USE [SA02012011]
GO
/****** Object:  StoredProcedure [dbo].[pVerifyCredentials]    Script Date: 02/28/2011 10:55:22 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER PROCEDURE [dbo].[pVerifyCredentials](
      @UserName VARCHAR(20),
      @Algorithm VARCHAR(16),
      @Pass VARCHAR(16)
)
AS
BEGIN
      set nocount on
      select case num when 1 then 'OK'
                      else 'Failed'
                      end as Result
        from (
      SELECT count(*) as Num
        FROM PersonID
       WHERE UserName = @UserName
         AND passwordID = convert(binary(16),HASHBYTES(@Algorithm, @Pass))
              ) AS X
END
return