linux-kernel - Re: [PATCH 2/6] crypto: kdf - SP800-108 Key Derivation Function

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20190112052758.GD639@sol.localdomain>
Date:   Fri, 11 Jan 2019 21:27:59 -0800
From:   Eric Biggers <ebiggers@...nel.org>
To:     Stephan Müller <smueller@...onox.de>
Cc:     Herbert Xu <herbert@...dor.apana.org.au>,
        James Bottomley <James.Bottomley@...senpartnership.com>,
        Andy Lutomirski <luto@...capital.net>,
        "Lee, Chun-Yi" <joeyli.kernel@...il.com>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Pavel Machek <pavel@....cz>, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, keyrings@...r.kernel.org,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Chen Yu <yu.c.chen@...el.com>,
        Oliver Neukum <oneukum@...e.com>,
        Ryan Chen <yu.chen.surf@...il.com>,
        David Howells <dhowells@...hat.com>,
        Giovanni Gherdovich <ggherdovich@...e.cz>,
        Randy Dunlap <rdunlap@...radead.org>,
        Jann Horn <jannh@...gle.com>,
        Andy Lutomirski <luto@...nel.org>, linux-crypto@...r.kernel.org
Subject: Re: [PATCH 2/6] crypto: kdf - SP800-108 Key Derivation Function

On Fri, Jan 11, 2019 at 08:10:02PM +0100, Stephan Müller wrote:
> The SP800-108 compliant Key Derivation Function is implemented as a
> random number generator considering that it behaves like a deterministic
> RNG.
> 
> All three KDF types specified in SP800-108 are implemented.
> 
> The code comments provide details about how to invoke the different KDF
> types.
> 
> Signed-off-by: Stephan Mueller <smueller@...onox.de>
> ---
>  crypto/Kconfig  |   7 +
>  crypto/Makefile |   1 +
>  crypto/kdf.c    | 492 ++++++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 500 insertions(+)
>  create mode 100644 crypto/kdf.c
> 
> diff --git a/crypto/Kconfig b/crypto/Kconfig
> index 86960aa53e0f..cc80d89e0cf5 100644
> --- a/crypto/Kconfig
> +++ b/crypto/Kconfig
> @@ -561,6 +561,13 @@ config CRYPTO_HMAC
>  	  HMAC: Keyed-Hashing for Message Authentication (RFC2104).
>  	  This is required for IPSec.
>  
> +config CRYPTO_KDF
> +	tristate "Key Derivation Function (SP800-108)"
> +	select CRYPTO_RNG
> +	help
> +	  Support for KDF compliant to SP800-108. All three types of
> +	  KDF specified in SP800-108 are implemented.
> +
>  config CRYPTO_XCBC
>  	tristate "XCBC support"
>  	select CRYPTO_HASH
> diff --git a/crypto/Makefile b/crypto/Makefile
> index 799ed5e94606..69a0bb64b0ac 100644
> --- a/crypto/Makefile
> +++ b/crypto/Makefile
> @@ -58,6 +58,7 @@ crypto_user-y := crypto_user_base.o
>  crypto_user-$(CONFIG_CRYPTO_STATS) += crypto_user_stat.o
>  obj-$(CONFIG_CRYPTO_CMAC) += cmac.o
>  obj-$(CONFIG_CRYPTO_HMAC) += hmac.o
> +obj-$(CONFIG_CRYPTO_KDF) += kdf.o

This naming is too generic.  CONFIG_CRYPTO_KDF and kdf.c imply that this is
related to all KDFs.  But actually it is an implementation of a few specific
KDFs.  Can you give it a clearer name, like KDF_SP800?

- Eric