DM8168 Crypto hardware query

Ganesh74733

Prodigy 60 points

Other Parts Discussed in Thread: AES-128

Hello,

Based on the patches given in the the DM8168 crypto engine support,

(http://processors.wiki.ti.com/index.php/Installing_AM389x_C6A816x_DM816x_Crypto_Support)

i've evaluated the AES encryption/decryption with the examples and all the operations worked

flawlessly. Being said this, i want to use the AES-128 with CTR (counter) mode from application.

From what i've gathered through the OCF userspace and kernel patches, i've not found the

support for CTR mode. Interestingly the DM816x netra crypto driver (nss-aes.c) in the kernel

has some references to counter mode.

I would really appreciate if some pointers are provided on using the AES-128 CTR mode algorithm

in dm816x crypto engine from userspace application.

Thanks,

Ganesh

over 13 years ago

0 MarcPyne over 13 years ago

TI__Mastermind 25055 points

Hello,

The Crypto API as implemented on the DM81xx supports AES CTR mode (i.e. ctr(aes) is available). The current open source implementation of Linux OCF, unlike the implementation for OpenBSD, does not (yet) support CTR mode via the /dev/crypto interface. The CTR mode limitation exists in both the OpenSSL and OCF packages (i.e. both sides of the /dev/crypto interface).

Note that, to be able to use any new modes via /dev/crypto from OpenSSL, changes to the OpenSSL distribution file crypto/engine/eng_cryptodev.c would be necessary. The currently supported ciphers are contained in the “ciphers[]” list (and digests in the “digests[]” list).

Regards,
Marc

0 Herb Kutscha over 13 years ago

Intellectual 610 points

I share Ganesh's interest.

0 Herb Kutscha over 13 years ago in reply to Herb Kutscha

Intellectual 610 points

Whoops. Didn't see the excellent answer.

0 Ganesh74733 over 13 years ago in reply to MarcPyne

Prodigy 60 points

Hi Marc,

Thanks very for the current status on CTR mode support.

Is there any plan from TI side on implementation of the CTR mode support in

OCF, OpenSSL frame work in coming days ?

Thanks,

Ganesh.

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DM8168 Crypto hardware query