linux-kernel - [PATCH v3 0/7] crypto: AF_ALG: add AEAD and RNG support

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Message-ID: <4088013.2O8zCP0xXa@tachyon.chronox.de>
Date:	Fri, 21 Nov 2014 06:29:36 +0100
From:	Stephan Mueller <smueller@...onox.de>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	Daniel Borkmann <dborkman@...hat.com>,
	'Quentin Gouchet' <quentin.gouchet@...il.com>,
	lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-crypto@...r.kernel.org, linux-api@...r.kernel.org
Subject: [PATCH v3 0/7] crypto: AF_ALG: add AEAD and RNG support

Hi,

This patch set adds AEAD and RNG support to the AF_ALG interface
exported by the kernel crypto API. By extending AF_ALG with AEAD and RNG
support, all cipher types the kernel crypto API allows access to are
now accessible from userspace.

The RNG support is stand-alone.

The AEAD implementation is added to algif_skcipher.c to prevent
re-implementation of the memory moving logic.

The extension for the AEAD support can be summarized with the following
types of changes:

        * select the correct crypto API functions (either the ablkcipher
          or the aead functions)

        * apply the additional data needed for AEAD at the right time
          (associated data, authentication tag) -- this includes the addition
          of user space interfaces to allow setting this data.

        * add the calculation for the memory size needed for encryption and
          decryption.

In addition, the patch set adds a getsockopt implementation to skcipher to
allow user space to inquire about properties of the ciphers (IV size,
block size, authentication data size). This extension would be needed for a
generic user space usage of these ciphers.

The new AEAD and RNG interfaces are fully tested with the test application
provided at [1]. That test application exercises all newly added user space
interfaces.


Stephan Mueller (7):
*tch set was tested on x86_64 and i386.

[1] http://www.chronox.de/libkcapi.html

Changes v2:
* rebase to current cryptodev-2.6 tree
* use memzero_explicit to zeroize AEAD associated data
* use sizeof for determining length of AEAD associated data
* update algif_rng.c covering all suggestions from Daniel Borkmann
  <dborkman@...hat.com>
* addition of patch 9: add digestsize interface for hashes
* addition of patch to update documentation covering the userspace interface
* change numbers of getsockopt options: separate them from sendmsg interface
  definitions

Changes v3:
* remove getsockopt interface
* AEAD: associated data is set prepended to the plain/ciphertext
* AEAD: allowing arbitrary associated data lengths
* remove setkey patch as protection was already in the existing code

  crypto: AF_ALG: add user space interface for AEAD
  crypto: AF_ALG: extend data structuers for AEAD
  crypto: AF_ALG: crypto API calls to inline functions
  crypto: AF_ALG: add AEAD support
  crypto: AF_ALG: add random number generator support
  crypto: AF_ALG: enable RNG interface compilation
  crypto: AF_ALG: document the user space interface

 Documentation/crypto/crypto-API-userspace.txt |  70 +++++-
 crypto/Kconfig                                |   9 +
 crypto/Makefile                               |   1 +
 crypto/af_alg.c                               |  12 +
 crypto/algif_rng.c                            | 186 ++++++++++++++++
 crypto/algif_skcipher.c                       | 308 +++++++++++++++++++++++---
 include/crypto/if_alg.h                       |   2 +
 include/uapi/linux/if_alg.h                   |   2 +
 8 files changed, 559 insertions(+), 31 deletions(-)
 create mode 100644 crypto/algif_rng.c

-- 
2.1.0


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