Reading the manual pages of vnconfig(8) and blowfish(3), I was asking
myself how many characters are used for the encryption key of virtual
disk devices at all. Looking at the source code of vnconfig, it looks to
me as if the maximum number of characters which can be entered at the
password prompt is 128, but examining the source code of
sys/crypto/blf.{h,c} more closely, I'm getting the impression that only
56 bytes (the maximum key length of the blowfish algorithm) are really
utilized. Please, is my observation correct?
(Since I'd like to use diceware[1] passphrases with vnconfig, if it *is*
correct, I'd have to write my own function for getting the passphrase
from the terminal and translate it into an appropriate blowfish key.
That's the reason why I'm asking.)
Regards, Stefan
[1] http://www.diceware.com
