1.\" $OpenBSD: BN_set_negative.3,v 1.5 2019/06/03 14:43:15 schwarze Exp $ 2.\" 3.\" Copyright (c) 2016 Ingo Schwarze <schwarze@openbsd.org> 4.\" 5.\" Permission to use, copy, modify, and distribute this software for any 6.\" purpose with or without fee is hereby granted, provided that the above 7.\" copyright notice and this permission notice appear in all copies. 8.\" 9.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16.\" 17.Dd $Mdocdate: June 3 2019 $ 18.Dt BN_SET_NEGATIVE 3 19.Os 20.Sh NAME 21.Nm BN_set_negative , 22.Nm BN_is_negative 23.Nd change and inspect the sign of a BIGNUM 24.Sh SYNOPSIS 25.In openssl/bn.h 26.Ft void 27.Fo BN_set_negative 28.Fa "BIGNUM *b" 29.Fa "int n" 30.Fc 31.Ft int 32.Fo BN_is_negative 33.Fa "const BIGNUM *b" 34.Fc 35.Sh DESCRIPTION 36.Fn BN_set_negative 37sets 38.Fa b 39to negative if both 40.Fa b 41and 42.Fa n 43are non-zero, otherwise it sets it to positive. 44.Pp 45.Fn BN_is_negative 46tests the sign of 47.Fa b . 48It is currently implemented as a macro. 49.Sh RETURN VALUES 50.Fn BN_is_negative 51returns 1 if 52.Fa b 53is negative or 0 otherwise. 54.Sh SEE ALSO 55.Xr BN_add 3 , 56.Xr BN_new 3 , 57.Xr BN_set_bit 3 , 58.Xr BN_zero 3 59.Sh HISTORY 60.Fn BN_set_negative 61and 62.Fn BN_is_negative 63first appeared in OpenSSL 0.9.8 and have been available since 64.Ox 4.5 . 65