package/network/services/hostapd/patches/160-dpp_pkex-EC-point-mul-w-value-prime.patch

   1 From 54211caa2e0e5163aefef390daf88a971367a702 Mon Sep 17 00:00:00 2001
   2 From: Glenn Strauss <gstrauss@gluelogic.com>
   3 Date: Tue, 4 Oct 2022 17:09:24 -0400
   4 Subject: [PATCH 6/7] dpp_pkex: EC point mul w/ value < prime
   5
   6 crypto_ec_point_mul() with mbedtls requires point
   7 be multiplied by a multiplicand with value < prime
   8
   9 Signed-off-by: Glenn Strauss <gstrauss@gluelogic.com>
  10 ---
  11  src/common/dpp_crypto.c | 4 +++-
  12  1 file changed, 3 insertions(+), 1 deletion(-)
  13
  14 --- a/src/common/dpp_crypto.c
  15 +++ b/src/common/dpp_crypto.c
  16 @@ -1567,7 +1567,9 @@ dpp_pkex_derive_Qr(const struct dpp_curv
  17         Pr = crypto_ec_key_get_public_key(Pr_key);
  18         Qr = crypto_ec_point_init(ec);
  19         hash_bn = crypto_bignum_init_set(hash, curve->hash_len);
  20 -       if (!Pr || !Qr || !hash_bn || crypto_ec_point_mul(ec, Pr, hash_bn, Qr))
  21 +       if (!Pr || !Qr || !hash_bn ||
  22 +           crypto_bignum_mod(hash_bn, crypto_ec_get_prime(ec), hash_bn) ||
  23 +           crypto_ec_point_mul(ec, Pr, hash_bn, Qr))
  24                 goto fail;
  25
  26         if (crypto_ec_point_is_at_infinity(ec, Qr)) {