diff options
| -rw-r--r-- | crypto/bn/bn_lib.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/crypto/bn/bn_lib.c b/crypto/bn/bn_lib.c index 1e62b96874..e7ffce2875 100644 --- a/crypto/bn/bn_lib.c +++ b/crypto/bn/bn_lib.c @@ -322,15 +322,19 @@ BIGNUM *BN_dup(const BIGNUM *a) BIGNUM *BN_copy(BIGNUM *a, const BIGNUM *b) { + int bn_words; + bn_check_top(b); + bn_words = BN_get_flags(b, BN_FLG_CONSTTIME) ? b->dmax : b->top; + if (a == b) return a; - if (bn_wexpand(a, b->top) == NULL) + if (bn_wexpand(a, bn_words) == NULL) return NULL; if (b->top > 0) - memcpy(a->d, b->d, sizeof(b->d[0]) * b->top); + memcpy(a->d, b->d, sizeof(b->d[0]) * bn_words); a->neg = b->neg; a->top = b->top; |