X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=crypto%2Fecdh%2Fech_ossl.c;h=2656797449e7075cd910bd69deaf4c6c8012b3f5;hb=a3a2e3a43d13d8486c5e100e1bef7fec8e61b27b;hp=94a8f4b696a5fcb97c3cd08ab4c471d8dc696210;hpb=67ef4f63f1fcedc7202a721007e9aac29133a668;p=oweals%2Fopenssl.git

diff --git a/crypto/ecdh/ech_ossl.c b/crypto/ecdh/ech_ossl.c
index 94a8f4b696..2656797449 100644
--- a/crypto/ecdh/ech_ossl.c
+++ b/crypto/ecdh/ech_ossl.c
@@ -146,6 +146,18 @@ static int ecdh_compute_key(void *out, size_t outlen, const EC_POINT *pub_key,
 		}
 
 	group = EC_KEY_get0_group(ecdh);
+
+	if (EC_KEY_get_flags(ecdh) & EC_FLAG_COFACTOR_ECDH)
+		{
+		if (!EC_GROUP_get_cofactor(group, x, ctx) ||
+			!BN_mul(x, x, priv_key, ctx))
+			{
+			ECDHerr(ECDH_F_ECDH_COMPUTE_KEY, ERR_R_MALLOC_FAILURE);
+			goto err;
+			}
+		priv_key = x;
+		}
+
 	if ((tmp=EC_POINT_new(group)) == NULL)
 		{
 		ECDHerr(ECDH_F_ECDH_COMPUTE_KEY,ERR_R_MALLOC_FAILURE);