linux-kernel - Re: [RFC PATCH 4/5] crypto: Adds user space interface for ALG_SET_KEY

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Message-ID: <2554415.t45IJDmies@tauon.chronox.de>
Date:   Fri, 24 May 2019 09:19:56 +0200
From:   Stephan Mueller <smueller@...onox.de>
To:     Kalyani Akula <kalyania@...inx.com>, keyrings@...r.kernel.org
Cc:     "herbert@...dor.apana.org.au" <herbert@...dor.apana.org.au>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Sarat Chand Savitala <saratcha@...inx.com>
Subject: Re: [RFC PATCH 4/5] crypto: Adds user space interface for ALG_SET_KEY_TYPE

Am Mittwoch, 8. Mai 2019, 11:31:08 CEST schrieb Kalyani Akula:

Hi Kalyani,

> Hi Stephan,
> 
> Keyrings is in-kernel key-management and retention facility. User can use it
> to manage keys used for applications.
> 
> Xilinx cryptographic hardware has a mechanism to store keys in its internal
> hardware and do not have mechanism to read it back due to security reasons.
> It stores key internally in different forms like simple key, key encrypted
> with unique hardware DNA, key encrypted with hardware family key, key
> stored in eFUSEs/BBRAM etc.
> Based on security level expected, user can select one of the key for AES
> operation. Since AES hardware internally has access to these keys, user do
> not require to provide key to hardware, but need to tell which internal
> hardware key user application like to use for AES operation.
> 
> Basic need is to pass information to AES hardware about which internal
> hardware key to be used for AES operation.
> 
> I agree that from general use case perspective we are not selecting key type
> but selecting internal hardware keys provided by user. How about providing
> option to select custom hardware keys provided by hardware
> (AES_SEL_HW_KEY)?

I am not intimately familiary with the keyring facility. Thus, let us ask the 
experts at the keyring mailing list :-)

> 
> Thanks
> kalyani
> 
> > -----Original Message-----
> > From: Stephan Mueller <smueller@...onox.de>
> > Sent: Thursday, April 25, 2019 12:01 AM
> > To: Kalyani Akula <kalyania@...inx.com>
> > Cc: herbert@...dor.apana.org.au; davem@...emloft.net; linux-
> > crypto@...r.kernel.org; linux-kernel@...r.kernel.org
> > Subject: Re: [RFC PATCH 4/5] crypto: Adds user space interface for
> > ALG_SET_KEY_TYPE
> > 
> > Am Montag, 22. April 2019, 11:17:55 CEST schrieb Kalyani Akula:
> > 
> > Hi Kalyani,
> > 
> > > > Besides, seem to be more a key handling issue. Wouldn't it make
> > > > sense to rather have such issue solved with key rings than in the
> > > > kernel crypto API?
> > > 
> > > [kalyani] Can you please elaborate on this further ?
> > 
> > The kernel has a keyring support in security/keys which has a user space
> > interface with keyutils. That interface is commonly used for any sort of
> > key manipulation.
> > 
> > Ciao
> > Stephan



Ciao
Stephan