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BN_one.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_zero, BN_one, BN_value_one, BN_set_word, BN_get_word \- BIGNUM assignment operations .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/bn.h> \& \& void BN_zero(BIGNUM *a); \& int BN_one(BIGNUM *a); \& \& const BIGNUM *BN_value_one(void); \& \& int BN_set_word(BIGNUM *a, BN_ULONG w); \& unsigned BN_ULONG BN_get_word(BIGNUM *a); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\fB\s-1BN_ULONG\s0\fR is a macro that will be an unsigned integral type optimized for the most efficient implementation on the local platform. .PP \&\fBBN_zero()\fR, \fBBN_one()\fR and \fBBN_set_word()\fR set \fBa\fR to the values 0, 1 and \&\fBw\fR respectively. \fBBN_zero()\fR and \fBBN_one()\fR are macros. .PP \&\fBBN_value_one()\fR returns a \fB\s-1BIGNUM\s0\fR constant of value 1. This constant is useful for use in comparisons and assignment. .PP \&\fBBN_get_word()\fR returns \fBa\fR, if it can be represented as a \fB\s-1BN_ULONG\s0\fR. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBBN_get_word()\fR returns the value \fBa\fR, or all-bits-set if \fBa\fR cannot be represented as a single integer. .PP \&\fBBN_one()\fR and \fBBN_set_word()\fR return 1 on success, 0 otherwise. \&\fBBN_value_one()\fR returns the constant. \&\fBBN_zero()\fR never fails and returns no value. .SH "BUGS" .IX Header "BUGS" If a \fB\s-1BIGNUM\s0\fR is equal to the value of all-bits-set, it will collide with the error condition returned by \fBBN_get_word()\fR which uses that as an error value. .PP \&\fB\s-1BN_ULONG\s0\fR should probably be a typedef. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBBN_bn2bin\fR\|(3) .SH "HISTORY" .IX Header "HISTORY" In OpenSSL 0.9.8, \fBBN_zero()\fR was changed to not return a value; previous versions returned an int. .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2000\-2018 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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