[RFC PATCH v2 0/4] crypto: (ec)dh - add privkey generation support

[Tudor Ambarus <tudor.ambarus@microchip.com>]

Hi,

This is an RFC to discuss how to support private key generation for dh and ecdh.

This is helpful in a user-space to kernel (ec)dh offload because the keys are
generated in kernel and never revealed to user-space.

Private key generation is also helpful to implement forward secrecy.
A public/private key system demonstrates the property of forward secrecy if it
creates new key pairs for each communication session. These key pairs are
generated on an as-needed basis and are destroyed after the session is over.
If an attacker were to record previous encrypted session data, they wouldn't be
able to decrypt it with possession of a long-term key.

There are crypto accelerators that are capable of generating and retaining
private keys without revealing them to software. This patch set is a
prerequisite for hardware private key generation support.

Changes in v2:
 - free dh params in case of error
 - code defensively in testmgr: use sizeof(*ptr) while in memcpy

v1 can be found at:
http://www.mail-archive.com/linux-crypto@vger.kernel.org/msg25176.html

Tudor Ambarus (4):
  crypto: ecc - add privkey generation support
  crypto: ecdh - allow user to provide NULL privkey
  crypto: dh - allow user to provide NULL privkey
  crypto: testmgr - add genkey kpp test

 crypto/dh.c      |  21 ++++++++
 crypto/ecc.c     |  20 +++++++
 crypto/ecc.h     |  14 +++++
 crypto/ecdh.c    |   4 ++
 crypto/testmgr.c |  76 +++++++++++++++++++++++----
 crypto/testmgr.h | 155 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 6 files changed, 279 insertions(+), 11 deletions(-)

-- 
2.7.4