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-.\"     $OpenBSD: BN_set_flags.3,v 1.6 2023/04/27 07:22:22 tb Exp $
-.\"
-.\" Copyright (c) 2017 Ingo Schwarze <schwarze@openbsd.org>
-.\"
-.\" Permission to use, copy, modify, and distribute this software for any
-.\" purpose with or without fee is hereby granted, provided that the above
-.\" copyright notice and this permission notice appear in all copies.
-.\"
-.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
-.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
-.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
-.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
-.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
-.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-.\"
-.Dd $Mdocdate: April 27 2023 $
-.Dt BN_SET_FLAGS 3
-.Os
-.Sh NAME
-.Nm BN_set_flags ,
-.Nm BN_get_flags
-.Nd enable and inspect flags on BIGNUM objects
-.Sh SYNOPSIS
-.In openssl/bn.h
-.Ft void
-.Fo BN_set_flags
-.Fa "BIGNUM *b"
-.Fa "int flags"
-.Fc
-.Ft int
-.Fo BN_get_flags
-.Fa "const BIGNUM *b"
-.Fa "int flags"
-.Fc
-.Sh DESCRIPTION
-.Fn BN_set_flags
-enables the given
-.Fa flags
-on
-.Fa b .
-The
-.Fa flags
-argument can contain zero or more of the following constants OR'ed
-together:
-.Bl -tag -width Ds
-.It Dv BN_FLG_CONSTTIME
-If this flag is set on the divident
-.Fa a
-or the divisor
-.Fa d
-in
-.Xr BN_div 3 ,
-on the exponent
-.Fa p
-in
-.Xr BN_mod_exp 3 ,
-or on the divisor
-.Fa a
-or the modulus
-.Fa n
-in
-.Xr BN_mod_inverse 3 ,
-these functions select algorithms with an execution time independent
-of the respective numbers, to avoid exposing sensitive information
-to timing side-channel attacks.
-.Pp
-This flag is off by default for
-.Vt BIGNUM
-objects created with
-.Xr BN_new 3 .
-.It Dv BN_FLG_MALLOCED
-If this flag is set,
-.Xr BN_free 3
-and
-.Xr BN_clear_free 3
-will not only clear and free the components of
-.Fa b ,
-but also
-.Fa b
-itself.
-This flag is set internally by
-.Xr BN_new 3 .
-Setting it manually on an existing
-.Vt BIGNUM
-object is usually a bad idea and can cause calls to
-.Xr free 3
-with bogus arguments.
-.It Dv BN_FLG_STATIC_DATA
-If this flag is set,
-.Xr BN_clear_free 3
-will neither clear nor free the memory used for storing the number.
-Consequently, setting it manually on an existing
-.Vt BIGNUM
-object is usually a terrible idea that can cause both disclosure
-of secret data and memory leaks.
-This flag is automatically set on the constant
-.Vt BIGNUM
-object returned by
-.Xr BN_value_one 3 .
-.El
-.Pp
-.Fn BN_get_flags
-interprets
-.Fa flags
-as a bitmask and returns those of the given flags that are set in
-.Fa b ,
-OR'ed together, or 0 if none of the given
-.Fa flags
-is set.
-The
-.Fa flags
-argument has the same syntax as for
-.Fn BN_set_flags .
-.Sh RETURN VALUES
-.Fn BN_get_flags
-returns zero or more of the above constants, OR'ed together.
-.Sh SEE ALSO
-.Xr BN_mod_exp 3 ,
-.Xr BN_mod_inverse 3 ,
-.Xr BN_new 3 ,
-.Xr BN_with_flags 3
-.Sh HISTORY
-.Fn BN_set_flags
-and
-.Fn BN_get_flags
-first appeared in SSLeay 0.9.1 and have been available since
-.Ox 2.6 .
-.Sh CAVEATS
-No public interface exists to clear a flag once it is set.
-So think twice before using
-.Fn BN_set_flags .
-.Sh BUGS
-Even if the
-.Dv BN_FLG_CONSTTIME
-flag is set on
-.Fa a
-or
-.Fa b ,
-.Fn BN_gcd
-neither fails nor operates in constant time, potentially allowing
-timing side-channel attacks.
-.Pp
-Even if the
-.Dv BN_FLG_CONSTTIME
-flag is set on
-.Fa p ,
-if the modulus
-.Fa m
-is even,
-.Xr BN_mod_exp 3
-does not operate in constant time, potentially allowing
-timing side-channel attacks.
-.Pp
-If
-.Dv BN_FLG_CONSTTIME
-is set on
-.Fa p ,
-.Fn BN_exp
-fails instead of operating in constant time.