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1 | .\" $OpenBSD: BN_set_negative.3,v 1.6 2021/12/06 19:45:27 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: December 6 2021 $ | ||
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 | ||
37 | sets | ||
38 | .Fa b | ||
39 | to negative if both | ||
40 | .Fa b | ||
41 | and | ||
42 | .Fa n | ||
43 | are non-zero, otherwise it sets it to positive. | ||
44 | .Pp | ||
45 | .Fn BN_is_negative | ||
46 | tests the sign of | ||
47 | .Fa b . | ||
48 | .Sh RETURN VALUES | ||
49 | .Fn BN_is_negative | ||
50 | returns 1 if | ||
51 | .Fa b | ||
52 | is negative or 0 otherwise. | ||
53 | .Sh SEE ALSO | ||
54 | .Xr BN_add 3 , | ||
55 | .Xr BN_new 3 , | ||
56 | .Xr BN_set_bit 3 , | ||
57 | .Xr BN_zero 3 | ||
58 | .Sh HISTORY | ||
59 | .Fn BN_set_negative | ||
60 | and | ||
61 | .Fn BN_is_negative | ||
62 | first appeared in OpenSSL 0.9.8 and have been available since | ||
63 | .Ox 4.5 . | ||