On Mo, 18 Mai 2020, 'Andy Wokula' via vim_dev wrote:

> Am 15.05.2020 um 22:31 schrieb Bram Moolenaar:
> > Patch 8.2.0762
> > Problem:    Buffer is not considered modified after setting crypt key.
> > Solution:   Set the modified flag. (Christian Brabandt, closes #6082)
> > Files:      src/optionstr.c, src/testdir/test_crypt.vim
> > 
> > 
> > *** ../vim-8.2.0761/src/optionstr.c 2020-04-17 19:41:16.100078313 +0200
> > --- src/optionstr.c 2020-05-15 22:28:34.399878939 +0200
> > ***************
> > *** 1157,1164 ****
> > --- 1157,1167 ----
> > 
> >     if (STRCMP(curbuf->b_p_key, oldval) != 0)
> >         // Need to update the swapfile.
> > +   {
> >         ml_set_crypt_key(curbuf, oldval,
> >                           *curbuf->b_p_cm == NUL ? p_cm : curbuf->b_p_cm);
> > +       changed_internal();
> > +   }
> >        }
> 
> Does it really do a before-after comparison of the key?
> If so ... maybe ... will this make it easier to guess a key?
> Ie, just guess a key and then check 'modified'?
> 
> I would have expected that any :X command sets the modified flag.

It does a comparison and checks, if a new key has been entered and that 
one differs from the previous active key. If not a new key has been 
entered than the old key will be still in play. So it does not directly 
relate to guessing the key value, it assumes the buffer has been 
successfully decrypted before.

Best,
Christian
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