linux-kernel - [PATCH v3 0/2] crypto: ecdh & ecc: Fix private key byte ordering issues

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Message-ID: <20240418152445.2773042-1-stefanb@linux.ibm.com>
Date: Thu, 18 Apr 2024 11:24:43 -0400
From: Stefan Berger <stefanb@...ux.ibm.com>
To: linux-crypto@...r.kernel.org, herbert@...dor.apana.org.au,
        davem@...emloft.net
Cc: linux-kernel@...r.kernel.org, jarkko@...nel.org, ardb@...nel.org,
        git@...sn.com, hkario@...hat.com, simo@...hat.com,
        Stefan Berger <stefanb@...ux.ibm.com>
Subject: [PATCH v3 0/2] crypto: ecdh & ecc: Fix private key byte ordering issues

The 1st patch fixes a byte ordering issue where ctx->private_key is
currently passed to ecc_is_key_valid but the key is in reverse byte order.
To solve this issue it introduces the variable 'priv', that is already used
throughout the ecc and ecdh code bases for a private key in proper byte
order, and calls ecc_is_key_valid with 'priv'. Note that ecc_gen_privkey
also calls __ecc_is_key_valid with 'priv' already.

The 2nd patch gets rid of the 'priv' variable wherever it is used to hold
a private key (byte-swapped initialized from ctx->private_key) in proper
byte order and uses ctx->private_key directly that is now initialized in
proper byte order.

Regards,
  Stefan

v3:
  - Added Jarkko's A-b tag
  - Expanded on the description of changes to ecc_gen_privkey (2/2)

v2:
  - Added missing zeroizing of priv variable (1/2)
  - Improved patch description (2/2)

Stefan Berger (2):
  crypto: ecdh - Pass private key in proper byte order to check valid
    key
  crypto: ecdh & ecc - Initialize ctx->private_key in proper byte order

 crypto/ecc.c                  | 29 ++++++++++-------------------
 crypto/ecdh.c                 |  9 ++++++---
 include/crypto/internal/ecc.h |  3 ++-
 3 files changed, 18 insertions(+), 23 deletions(-)

-- 
2.43.0