On 25/11/2019 16:17, Fourhundred Thecat wrote:
On 2019-11-25 14:55, Milan Broz wrote:
Hi Milan,
just to make sure there is no misunderstanding:
Then there is alignment, so the real data offset is aligned by default to
the 1MB boundary.
With this padding, header size is for 128bit key 2MB, for 256/512 key 4MB.
I am actually using 512 bit key:
--cipher aes-xts-plain64 --key-size 512 --hash sha512
so it would seem I need 4MB header for luks1 with 512 key
Yes. For reference: for 128bit it is 528384 bytes, for 256bit 1052672
bytes,
for 512bit (2x256bits in XTS mode) it is 2068480 bytes.
now I am confused. 2068480 is less than 2MB. So when aligned to 1MB
boundary, 2MB would be enough for luks1 with 512 key.
So is it 2MB or 4MB ?
Ah, yes, sorry, it is 2MB. (The real used space is 4040 512-byte sectors.)
Milan
_______________________________________________
dm-crypt mailing list
dm-crypt@xxxxxxxx
https://www.saout.de/mailman/listinfo/dm-crypt
