diff options
| -rw-r--r-- | crypto/bn/bn_word.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/crypto/bn/bn_word.c b/crypto/bn/bn_word.c index 1bcb37e292..bc5905fef4 100644 --- a/crypto/bn/bn_word.c +++ b/crypto/bn/bn_word.c @@ -175,7 +175,13 @@ int BN_sub_word(BIGNUM *a, BN_ULONG w) /* degenerate case: w is zero */ if (!w) return 1; /* degenerate case: a is zero */ - if(BN_is_zero(a)) return BN_set_word(a,w); + if(BN_is_zero(a)) + { + i = BN_set_word(a,w); + if (i != 0) + BN_set_negative(a, 1); + return i; + } /* handle 'a' when negative */ if (a->neg) { |