MDC/Non-MDC mode question

Werner Koch wk at
Tue Jul 31 11:06:01 CEST 2001

On Mon, 30 Jul 2001 23:40:28 -0400 (EDT), Kahil D Jallad said:

> use a slightly different mode of encryption, but I can't find this in the
> code,  i.e. as far as I can tell non-mdc packets and mdc packets do the
> same things with  as cipher resyncs and CFB encryption . . .

g10/cipher.c, line 80:

    cfx->cipher_hd = cipher_open( cfx->dek->algo,
				  use_mdc? CIPHER_MODE_CFB
					 : CIPHER_MODE_AUTO_CFB, 1 );

AUTO_CFB usually uses the classic PGP CFB mode whereas the simple mode
does use straight CFB mode without resynchronization.



Werner Koch        Omnis enim res, quae dando non deficit, dum habetur
g10 Code GmbH      et non datur, nondum habetur, quomodo habenda est.
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