utils: Use memeq_const() for all cryptographic purposes

src/libcharon/plugins/eap_mschapv2/eap_mschapv2.c

@@ -1087,8 +1087,8 @@ static status_t process_server_response(private_eap_mschapv2_t *this,
 	userid->destroy(userid);
 	chunk_clear(&nt_hash);
 
-	if (memeq(res->response.nt_response, this->nt_response.ptr,
-			  this->nt_response.len))
+	if (memeq_const(res->response.nt_response, this->nt_response.ptr,
+					this->nt_response.len))
 	{
 		chunk_t hex;
 		char msg[AUTH_RESPONSE_LEN + sizeof(SUCCESS_MESSAGE)];
@@ -1267,4 +1267,3 @@ eap_mschapv2_t *eap_mschapv2_create_peer(identification_t *server, identificatio
 
 	return &this->public;
 }
-