diff options
| -rw-r--r-- | src/openssl.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/src/openssl.c b/src/openssl.c index 9dbcda7..69115ce 100644 --- a/src/openssl.c +++ b/src/openssl.c @@ -1809,6 +1809,12 @@ static int bn__mod(lua_State *L) { if (!BN_mod(r, a, b, getctx(L))) return auxL_error(L, auxL_EOPENSSL, "bignum:__mod"); + /* lua has different rounding behaviour for mod than C */ + if (!BN_is_zero(r) && (BN_is_negative(a) ^ BN_is_negative(b))) { + if (!BN_add(r, r, b)) + return auxL_error(L, auxL_EOPENSSL, "bignum:__mod"); + } + return 1; } /* bn__mod() */ |