crypto_ec_point_mul() with mbedtls requires point
be multiplied by a multiplicand with value < prime
Signed-off-by: Glenn Strauss <gstrauss@xxxxxxxxxxxxx>
---
src/common/dpp_crypto.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/src/common/dpp_crypto.c b/src/common/dpp_crypto.c
index 1fbdc86a8..381dd0ed2 100644
--- a/src/common/dpp_crypto.c
+++ b/src/common/dpp_crypto.c
@@ -1567,7 +1567,9 @@ dpp_pkex_derive_Qr(const struct dpp_curve_params *curve, const u8 *mac_resp,
Pr = crypto_ec_key_get_public_key(Pr_key);
Qr = crypto_ec_point_init(ec);
hash_bn = crypto_bignum_init_set(hash, curve->hash_len);
- if (!Pr || !Qr || !hash_bn || crypto_ec_point_mul(ec, Pr, hash_bn, Qr))
+ if (!Pr || !Qr || !hash_bn ||
+ crypto_bignum_mod(hash_bn, crypto_ec_get_prime(ec), hash_bn) ||
+ crypto_ec_point_mul(ec, Pr, hash_bn, Qr))
goto fail;
if (crypto_ec_point_is_at_infinity(ec, Qr)) {
--
2.38.1
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