/*
- * Copyright 1995-2017 The OpenSSL Project Authors. All Rights Reserved.
+ * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
BIGNUM *ret = NULL;
int sign;
- if (pnoinv)
+ /* This is invalid input so we don't worry about constant time here */
+ if (BN_abs_is_word(n, 1) || BN_is_zero(n)) {
+ if (pnoinv != NULL)
+ *pnoinv = 1;
+ return NULL;
+ }
+
+ if (pnoinv != NULL)
*pnoinv = 0;
if ((BN_get_flags(a, BN_FLG_CONSTTIME) != 0)