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BN_CTX_end.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_CTX_start, BN_CTX_get, BN_CTX_end \- use temporary BIGNUM variables .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/bn.h> \& \& void BN_CTX_start(BN_CTX *ctx); \& \& BIGNUM *BN_CTX_get(BN_CTX *ctx); \& \& void BN_CTX_end(BN_CTX *ctx); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" These functions are used to obtain temporary \fB\s-1BIGNUM\s0\fR variables from a \fB\s-1BN_CTX\s0\fR (which can been created by using \fBBN_CTX_new\fR\|(3)) in order to save the overhead of repeatedly creating and freeing \fB\s-1BIGNUM\s0\fRs in functions that are called from inside a loop. .PP A function must call \fBBN_CTX_start()\fR first. Then, \fBBN_CTX_get()\fR may be called repeatedly to obtain temporary \fB\s-1BIGNUM\s0\fRs. All \fBBN_CTX_get()\fR calls must be made before calling any other functions that use the \&\fBctx\fR as an argument. .PP Finally, \fBBN_CTX_end()\fR must be called before returning from the function. If \fBctx\fR is \s-1NULL,\s0 nothing is done. When \fBBN_CTX_end()\fR is called, the \fB\s-1BIGNUM\s0\fR pointers obtained from \&\fBBN_CTX_get()\fR become invalid. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBBN_CTX_start()\fR and \fBBN_CTX_end()\fR return no values. .PP \&\fBBN_CTX_get()\fR returns a pointer to the \fB\s-1BIGNUM\s0\fR, or \fB\s-1NULL\s0\fR on error. Once \fBBN_CTX_get()\fR has failed, the subsequent calls will return \fB\s-1NULL\s0\fR as well, so it is sufficient to check the return value of the last \&\fBBN_CTX_get()\fR call. In case of an error, an error code is set, which can be obtained by \fBERR_get_error\fR\|(3). .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBBN_CTX_new\fR\|(3) .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2000\-2019 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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