question to crypt_format function

Hi,

we are using libcryptsetup to generate a luks container on an arm device. The developed code comes from your example
(https://gitlab.com/cryptsetup/cryptsetup/wikis/API/crypt_luks_usage_8c-ex
ample.html). But we have one problem: When running the code on the device, the crypt_format function will ends with the error “Cannot initialize crypto backend”. Do you have any tip to solve the error?

Thanks for help.

Stephan Giehlow

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Hello,

does the same thing happen when you run cryptsetup manually from a commandline? In particular, what are the last steps printed when you do it manually with the '--debug' option?

Regards,
Arno Wagner

Arno Wagner,     Dr. sc. techn., Dipl. Inform.,    Email: [email protected]
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Something is probably misconfigured on your system.

If cryptsetup binary itself works, try to add debug info to your program:

crypt_set_debug_level(CRYPT_DEBUG_ALL);

and also try to strace it (do not use valuable password though:)

If it there is still not useful explanation in log, please send the output of these logs.

Thanks,
Milan

Hi,

thanks for the fast answer. The cryptsetup binary itself works on the arm device. I added debug logging to my source. When I perform the crypt_format function I can see the Log "#Crypto backend () initialized". On my developer virtual machine are more information - like "#Crypto backen (Linux 3.7.10-1.32-desktop kernel CryptoAPI) initialized".

Is there any missing additional call to initialize any crypto backend?

Thanks,
Stephan

-----Ursprüngliche Nachricht-----
Von: Milan Broz [mailto:[email protected]]
Gesendet: Dienstag, 20. Oktober 2015 20:24
An: Stephan Giehlow <[email protected]>; [email protected]
Betreff: Re: [dm-crypt] question to crypt_format function

(https://gitlab.com/cryptsetup/cryptsetup/wikis/API/crypt_luks_usage_8c-ex
ample.html).

Something is probably misconfigured on your system.

If cryptsetup binary itself works, try to add debug info to your program:

crypt_set_debug_level(CRYPT_DEBUG_ALL);

and also try to strace it (do not use valuable password though:)

If it there is still not useful explanation in log, please send the output of these logs.

Thanks,
Milan

No, it should be automatic. (The example works as it is in sources.) So it depends what crypto backend libcryptsetup was compiled for (empty string in message is definitely wrong), you apparently
use non-standard configuration (kernel crypto API is not default backend).

Anyway, I cannot say more without reading logs and strace.

Milan