linux-kernel - [PATCH 0/8] crypto: AF_ALG: add AEAD and RNG support

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Message-ID: <4738444.A2vZX1nNCo@tachyon.chronox.de>
Date:	Wed, 12 Nov 2014 07:59:30 +0100
From:	Stephan Mueller <smueller@...onox.de>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	ABI/API <linux-api@...r.kernel.org>, linux-crypto@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 0/8] 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.

The patch set was tested on x86_64 and i386.

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

Stephan Mueller (8):
  crypto: AF_ALG: add user space interface for AEAD
  crypto: AF_ALG: user space interface for cipher info
  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: make setkey optional
  crypto: AF_ALG: add random number generator support
  crypto: AF_ALG: enable RNG interface compilation

 crypto/Kconfig              |   9 ++
 crypto/Makefile             |   1 +
 crypto/af_alg.c             |  20 +++
 crypto/algif_rng.c          | 186 +++++++++++++++++++++++
 crypto/algif_skcipher.c     | 350 ++++++++++++++++++++++++++++++++++++++++----
 include/crypto/if_alg.h     |   2 +
 include/uapi/linux/if_alg.h |  10 ++
 7 files changed, 550 insertions(+), 28 deletions(-)
 create mode 100644 crypto/algif_rng.c

-- 
2.1.0

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