Re: [GNU Crypto] towards a (new) high-level symmetric block cipher API (long)

[Raif S. Naffah]

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On Saturday 15 March 2003 13:23, Raif S. Naffah wrote:
> ...
> Cipher ::=   IBlockCipher | IMode
> Cascade ::=  (Cipher | Cascade)+
> Assembly ::= Cascade Padding
>...
> public class Cascade implements ICascade {
>    ...
>    public static ICascade getInstance(IBlockCipher e1, IBlockCipher
> e2) throws IllegalArgumentException {...}
>    ...
> }

the above will not allow constructing a Cascade of one IBlockCipher only 
(case of a cipher + padding, or mode + padding), unless one of the 
arguments is allowed to be null.  i dont think allowing null is a bad 
idea, hence the Factory method should be re-written as, or the 
following should be added to the API:

   public static ICascade getInstance(IBlockCipher e)
      throws IllegalArgumentException {...}


cheers;
rsn
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