Re: [PATCH 0/2] Add TLS record layer encryption module

From: Hannes Frederic Sowa
Date: Mon Aug 25 2014 - 09:12:57 EST


On Di, 2014-07-29 at 12:32 +0300, Cristian Stoica wrote:
> This set of patches introduces support for TLS 1.0 record layer
> encryption/decryption with a corresponding algorithm called
> tls10(hmac(<hash>),cbc(<cipher>)).
> Similarly to authenc.c on which it is based, this module mixes the base
> algorithms in software to produce an algorithm that does record layer
> encryption and decryption for TLS1.0.
> Any combination of hw and sw base algorithms is possible, but the purpose
> is to take advantage of hardware acceleration for TLS record layer offloading
> when hardware acceleration is present.
> This is a software alternative to forthcoming Freescale caam patches that
> will add support for one-pass hardware-only TLS record layer offloading.
> Performance figures depend largely on several factors including hardware
> support and record layer size. For user-space applications the
> kernel/user-space interface is also important. That said, we have done several
> performance tests using openssl and cryptodev on Freescale QorIQ platforms.
> On P4080, for a single stream of records larger than 512 bytes, the performance
> improved from about 22Mbytes/s to 64Mbytes/s while also reducing CPU load.
> The purpose of this module is to enable TLS kernel offloading on hw platforms
> that have acceleration for AES/SHA1 but do not have direct support for TLS
> record layer.
> (minor dependency on pending patch
> crypto: testmgr.c: white space fix-ups on test_aead)
> Cristian Stoica (2):
> crypto: add support for TLS 1.0 record encryption
> crypto: add TLS 1.0 test vectors for AES-CBC-HMAC-SHA1
> crypto/Kconfig | 20 ++
> crypto/Makefile | 1 +
> crypto/authenc.c | 5 +-
> crypto/tcrypt.c | 5 +
> crypto/testmgr.c | 41 +++-
> crypto/testmgr.h | 217 +++++++++++++++++++
> crypto/tls.c | 528 +++++++++++++++++++++++++++++++++++++++++++++++
> include/crypto/authenc.h | 3 +
> 8 files changed, 808 insertions(+), 12 deletions(-)
> create mode 100644 crypto/tls.c

Maybe could you add netdev@xxxxxxxxxxxxxxx to Cc on your next

It would be great if this feature would be made available in some way
that user space does TLS handshaking over a socket and symmetric keys
could later be installed via e.g. setsockopt and kernel offloads tls
processing over this socket.

Alert message handling seems problematic, though and might require some
out-of-band interface.


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