[dm-crypt] 32/64-bit compatibility: Plain encryption of USB device partition

[dm-crypt] 32/64-bit compatibility: Plain encryption of USB device partition

[Matthias Schwartz]

Hello,

I didn't found compatiblity information in the FAQ:

Questions:
- 32-bit system and 64-bit systems compatible?
- little endian and big endian systems compatible?

I like to do a plain encryption of a SD-Card partition but it seems that 
an encryption created on a 64 bit system can't be mounted on a 32 bit 
system.

Should this work?

On 64 bit system:
cryptsetup --cipher=aes-cbs-essiv:sha256 --hash riepmd160 open 
--type=plain /dev/sdb1 key
mkfs /dev/mapper/key

On 32 bit system
cryptsetup --cipher=aes-cbs-essiv:sha256 --hash riepmd160 open 
--type=plain /dev/sdb1 key
mount /dev/mapper/key /mnt


Best Matthias


-- 
____________________________________________________
HOCHSCHULE MANNHEIM - University of Applied Sciences
Center for Mass Spectrometry and Optical Spectroscopy (CeMOS)

Dipl.-Ing. Matthias Schwartz
Paul-Wittsack-Str. 10, 68163 Mannheim
Tel. 0621/292-6404
m.schwartz@hs-mannheim.de
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[dm-crypt] Re: 32/64-bit compatibility: Plain encryption of USB device partition

[Milan Broz]

On 24/03/2021 11:42, Matthias Schwartz wrote:
> Hello,
> 
> I didn't found compatiblity information in the FAQ:
> 
> Questions:
> - 32-bit system and 64-bit systems compatible?
> - little endian and big endian systems compatible?
> 
> I like to do a plain encryption of a SD-Card partition but it seems that 
> an encryption created on a 64 bit system can't be mounted on a 32 bit 
> system.
> 
> Should this work?

Everything should work, it is platform independent.

The only exception would be 32bit system compiled without 64bit sectors compatibility,
there a device size is limited (but that is not limitation of dmcrypt but
the whole system, it applies to fs etc).

But better please use LUKS for key management.

m.

 
> On 64 bit system:
> cryptsetup --cipher=aes-cbs-essiv:sha256 --hash riepmd160 open 
> --type=plain /dev/sdb1 key
> mkfs /dev/mapper/key
> 
> On 32 bit system
> cryptsetup --cipher=aes-cbs-essiv:sha256 --hash riepmd160 open 
> --type=plain /dev/sdb1 key
> mount /dev/mapper/key /mnt
> 
> 
> Best Matthias
> 
> 
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