How to boot into a luks encrypted rootfs partition from initramfs on i.MX6ULZ?

[skwang6272]

Hi everyone, 

I am trying to do disk encryption on i.MX6UL. The device is USB armory II. It has DCP and no CAAM.

This is my plan：

1、Two partitions. One for /boot, one for rootfs. Bootloader and kernel are stored in /boot and they are in plain text. The rootfs is encrypted by LUKS(DM-crpty).

2、Configure initramfs in the kernel. During the boot process, decrypt the encrypted rootfs and mount the root directory automatically.

3、LUKS uses file as key. At the same time this key file is encrypted with DCP.

Here is my question:

1、How to install the system on an already partitioned SD card？How to configure the encrypted file system？

2、How to configure initramfs to encrypt and load rootfs automatically?

I am just new to embedded development. Any suggestions, documentation and tutorials are welcome.

I have searched for similar issues

How to boot into a luks encrypted rootfs partition from initramfs on imx6 quad?

The document "Root filesystem encryption using DM-Crypt"  looks useful but I don't have permission to access it.

Thanks!

[MikeAtMT]

+1 looking for "Root filesystem encryption using DM-Crypt" - I've worked on this many years ago, but need to refresh my memory. Thank you!

[r1cebank]

Hi,

I am not sure if you already figured this out, but recently I've modified the USB Armory's image builder script to support the encrypted rootfs you mentioned.

https://github.com/r1cebank/usbarmory-debian-base_image

Hope this helps.

[Yuri]

Hello,

  Please refer to the following app note (assuming encrypted boot of U-boot and kernel).
"i.MX Encrypted Storage Using CAAM Secure Keys"
 
https://www.nxp.com/docs/en/application-note/AN12714.pdf

Regards,

Yuri.

[skwang6272]

Hi,

Thanks a lot!

But I have seen this doc. And I have no CAAM, only DCP. Are threy same?

[Yuri]

Hello,

  If i.MX processor does not have CAAM - only software based DM-crypt

may be applied.

Regards,

Yuri.

[adde_ado]

Hi Yuri,

Could you please send to me 

"Root filesystem encryption using DM-Crypt" document?

I'm working with Imx8mm and I have same issue.

Best regards,

Adde

[skwang6272]

Hi, 

Thank you for your reply. Could you show me any docs explain how to preform software based DM-crypt?

btw Why can't DCP do what CAAM does?

[Yuri]

Hello,

  Some material have been sent directly.

Regards,

Yuri.

[arunkrishnank]

Dear Yuri,

Is it possible to share the document to me. I am attempting rootfs encryption on a i.MX 6 ULL

[andreamengalli]

Hello Yuri,

I am working on encryption on i.MX8Mmini.

Could I have access to the document "Root filesystem encryption using DM-Crypt"?

Thanks in advance.

[andreamengalli]

Hello Yuri,

I am working on encryption on i.MX8Mmini.

Could I have access to the document "Root filesystem encryption using DM-Crypt"?

Thanks in advance.

[YoussefDALIL]

Hello @Yuri ,

Could I have also access to the document "Root filesystem encryption using DM-Crypt"

I really need this document to work on my project please.

Waiting for your reply

Thanks

[Yuri]

@YoussefDALIL 
Hello,

In addition to AN12714 (i.MX Encrypted Storage Using CAAM Secure Keys) use
section 10.5 (Disk encryption acceleration) of i.MX Linux User's Guide.

https://www.nxp.com/webapp/Download?colCode=AN12714

https://www.nxp.com/docs/en/user-guide/IMX_LINUX_USERS_GUIDE.pdf

 For specific customer's cases (OS releases) NXP Pro Support may be involved.

Regards,
Yuri.

[Yuri]

@andreamengalli 
Hello,

  please refer to

https://www.nxp.com/docs/en/application-note/AN12714.pdf

Regards,
Yuri.

[parthitce]

@YuriCould you please share the documents for dm-crypt to do with imx6ULL/imx6ULZ?

Thanks,

Parthiban N

[Yuri]

@parthitce 
Hello,

  I've sent You the file.

Regards,
Yuri.

[kmaincent]

Hello Yuri,

I am also working on encryption.

Could I have access to the document "Root filesystem encryption using DM-Crypt"?

Thanks,

[Yuri]

@kmaincent 
Hello,

  I've sent You some comments.

Regards,
Yuri.

[r1cebank]

I am having the same question, is it possible to send me the same documents?

[Yuri]

@r1cebank 

Done!

~Yuri.

[gulsrb]

Dear Mr. Yuri
It would be very much appreciated if you could also provide me with a copy of the "Root filesystem encryption using DM-Crypt" document.
Best regards,
Aleksandar