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BN_copy.3
.\" Automatically generated by Pod::Man 4.11 (Pod::Simple 3.35) .\" .\" Standard preamble: .\" ======================================================================== .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" Set up some character translations and predefined strings. \*(-- will .\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left .\" double quote, and \*(R" will give a right double quote. \*(C+ will .\" give a nicer C++. Capital omega is used to do unbreakable dashes and .\" therefore won't be available. \*(C` and \*(C' expand to `' in nroff, .\" nothing in troff, for use with C<>. .tr \(*W- .ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p' .ie n \{\ . ds -- \(*W- . ds PI pi . if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch . if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch . ds L" "" . ds R" "" . ds C` "" . ds C' "" 'br\} .el\{\ . ds -- \|\(em\| . ds PI \(*p . ds L" `` . ds R" '' . ds C` . ds C' 'br\} .\" .\" Escape single quotes in literal strings from groff's Unicode transform. .ie \n(.g .ds Aq \(aq .el .ds Aq ' .\" .\" If the F register is >0, we'll generate index entries on stderr for .\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index .\" entries marked with X<> in POD. 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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" BN_copy, BN_dup, BN_with_flags \- copy BIGNUMs .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/bn.h> \& \& BIGNUM *BN_copy(BIGNUM *to, const BIGNUM *from); \& \& BIGNUM *BN_dup(const BIGNUM *from); \& \& void BN_with_flags(BIGNUM *dest, const BIGNUM *b, int flags); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\fBBN_copy()\fR copies \fBfrom\fR to \fBto\fR. \fBBN_dup()\fR creates a new \fB\s-1BIGNUM\s0\fR containing the value \fBfrom\fR. .PP BN_with_flags creates a \fBtemporary\fR shallow copy of \fBb\fR in \fBdest\fR. It places significant restrictions on the copied data. Applications that do no adhere to these restrictions may encounter unexpected side effects or crashes. For that reason use of this function is discouraged. Any flags provided in \fBflags\fR will be set in \fBdest\fR in addition to any flags already set in \fBb\fR. For example this might commonly be used to create a temporary copy of a \s-1BIGNUM\s0 with the \&\fB\s-1BN_FLG_CONSTTIME\s0\fR flag set for constant time operations. The temporary copy in \&\fBdest\fR will share some internal state with \fBb\fR. For this reason the following restrictions apply to the use of \fBdest\fR: .IP "\(bu" 2 \&\fBdest\fR should be a newly allocated \s-1BIGNUM\s0 obtained via a call to \fBBN_new()\fR. It should not have been used for other purposes or initialised in any way. .IP "\(bu" 2 \&\fBdest\fR must only be used in \*(L"read-only\*(R" operations, i.e. typically those functions where the relevant parameter is declared \*(L"const\*(R". .IP "\(bu" 2 \&\fBdest\fR must be used and freed before any further subsequent use of \fBb\fR .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBBN_copy()\fR returns \fBto\fR on success, \s-1NULL\s0 on error. \fBBN_dup()\fR returns the new \fB\s-1BIGNUM\s0\fR, and \s-1NULL\s0 on error. The error codes can be obtained by \fBERR_get_error\fR\|(3). .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBERR_get_error\fR\|(3) .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2000\-2017 The OpenSSL Project Authors. All Rights Reserved. .PP Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.
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