210 lines
6.1 KiB
Groff
210 lines
6.1 KiB
Groff
.\" $NetBSD: BN_set_bit.3,v 1.5 2001/04/12 10:45:36 itojun Exp $
|
|
.\"
|
|
.\" Automatically generated by Pod::Man version 1.02
|
|
.\" Thu Apr 12 19:26:50 2001
|
|
.\"
|
|
.\" Standard preamble:
|
|
.\" ======================================================================
|
|
.de Sh \" Subsection heading
|
|
.br
|
|
.if t .Sp
|
|
.ne 5
|
|
.PP
|
|
\fB\\$1\fR
|
|
.PP
|
|
..
|
|
.de Sp \" Vertical space (when we can't use .PP)
|
|
.if t .sp .5v
|
|
.if n .sp
|
|
..
|
|
.de Ip \" List item
|
|
.br
|
|
.ie \\n(.$>=3 .ne \\$3
|
|
.el .ne 3
|
|
.IP "\\$1" \\$2
|
|
..
|
|
.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. | will give a
|
|
.\" real vertical bar. \*(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-|\(bv\*(Tr
|
|
.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" ''
|
|
'br\}
|
|
.\"
|
|
.\" If the F register is turned on, we'll generate index entries on stderr
|
|
.\" for titles (.TH), headers (.SH), subsections (.Sh), items (.Ip), and
|
|
.\" index entries marked with X<> in POD. Of course, you'll have to process
|
|
.\" the output yourself in some meaningful fashion.
|
|
.if \nF \{\
|
|
. de IX
|
|
. tm Index:\\$1\t\\n%\t"\\$2"
|
|
. .
|
|
. nr % 0
|
|
. rr F
|
|
.\}
|
|
.\"
|
|
.\" For nroff, turn off justification. Always turn off hyphenation; it
|
|
.\" makes way too many mistakes in technical documents.
|
|
.hy 0
|
|
.if n .na
|
|
.\"
|
|
.\" Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2).
|
|
.\" Fear. Run. Save yourself. No user-serviceable parts.
|
|
.bd B 3
|
|
. \" fudge factors for nroff and troff
|
|
.if n \{\
|
|
. ds #H 0
|
|
. ds #V .8m
|
|
. ds #F .3m
|
|
. ds #[ \f1
|
|
. ds #] \fP
|
|
.\}
|
|
.if t \{\
|
|
. ds #H ((1u-(\\\\n(.fu%2u))*.13m)
|
|
. ds #V .6m
|
|
. ds #F 0
|
|
. ds #[ \&
|
|
. ds #] \&
|
|
.\}
|
|
. \" simple accents for nroff and troff
|
|
.if n \{\
|
|
. ds ' \&
|
|
. ds ` \&
|
|
. ds ^ \&
|
|
. ds , \&
|
|
. ds ~ ~
|
|
. ds /
|
|
.\}
|
|
.if t \{\
|
|
. ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u"
|
|
. ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u'
|
|
. ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u'
|
|
. ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u'
|
|
. ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u'
|
|
. ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u'
|
|
.\}
|
|
. \" troff and (daisy-wheel) nroff accents
|
|
.ds : \\k:\h'-(\\n(.wu*8/10-\*(#H+.1m+\*(#F)'\v'-\*(#V'\z.\h'.2m+\*(#F'.\h'|\\n:u'\v'\*(#V'
|
|
.ds 8 \h'\*(#H'\(*b\h'-\*(#H'
|
|
.ds o \\k:\h'-(\\n(.wu+\w'\(de'u-\*(#H)/2u'\v'-.3n'\*(#[\z\(de\v'.3n'\h'|\\n:u'\*(#]
|
|
.ds d- \h'\*(#H'\(pd\h'-\w'~'u'\v'-.25m'\f2\(hy\fP\v'.25m'\h'-\*(#H'
|
|
.ds D- D\\k:\h'-\w'D'u'\v'-.11m'\z\(hy\v'.11m'\h'|\\n:u'
|
|
.ds th \*(#[\v'.3m'\s+1I\s-1\v'-.3m'\h'-(\w'I'u*2/3)'\s-1o\s+1\*(#]
|
|
.ds Th \*(#[\s+2I\s-2\h'-\w'I'u*3/5'\v'-.3m'o\v'.3m'\*(#]
|
|
.ds ae a\h'-(\w'a'u*4/10)'e
|
|
.ds Ae A\h'-(\w'A'u*4/10)'E
|
|
. \" corrections for vroff
|
|
.if v .ds ~ \\k:\h'-(\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\n:u'
|
|
.if v .ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'\v'-.4m'^\v'.4m'\h'|\\n:u'
|
|
. \" for low resolution devices (crt and lpr)
|
|
.if \n(.H>23 .if \n(.V>19 \
|
|
\{\
|
|
. ds : e
|
|
. ds 8 ss
|
|
. ds o a
|
|
. ds d- d\h'-1'\(ga
|
|
. ds D- D\h'-1'\(hy
|
|
. ds th \o'bp'
|
|
. ds Th \o'LP'
|
|
. ds ae ae
|
|
. ds Ae AE
|
|
.\}
|
|
.rm #[ #] #H #V #F C
|
|
.\" ======================================================================
|
|
.\"
|
|
.IX Title "BN_set_bit 3"
|
|
.TH BN_set_bit 3 "0.9.6a" "2000-07-22" "OpenSSL"
|
|
.UC
|
|
.SH "NAME"
|
|
BN_set_bit, BN_clear_bit, BN_is_bit_set, BN_mask_bits, BN_lshift,
|
|
BN_lshift1, BN_rshift, BN_rshift1 \- bit operations on BIGNUMs
|
|
.SH "LIBRARY"
|
|
libcrypto, -lcrypto
|
|
.SH "SYNOPSIS"
|
|
.IX Header "SYNOPSIS"
|
|
.Vb 1
|
|
\& #include <openssl/bn.h>
|
|
.Ve
|
|
.Vb 2
|
|
\& int BN_set_bit(BIGNUM *a, int n);
|
|
\& int BN_clear_bit(BIGNUM *a, int n);
|
|
.Ve
|
|
.Vb 1
|
|
\& int BN_is_bit_set(const BIGNUM *a, int n);
|
|
.Ve
|
|
.Vb 1
|
|
\& int BN_mask_bits(BIGNUM *a, int n);
|
|
.Ve
|
|
.Vb 2
|
|
\& int BN_lshift(BIGNUM *r, const BIGNUM *a, int n);
|
|
\& int BN_lshift1(BIGNUM *r, BIGNUM *a);
|
|
.Ve
|
|
.Vb 2
|
|
\& int BN_rshift(BIGNUM *r, BIGNUM *a, int n);
|
|
\& int BN_rshift1(BIGNUM *r, BIGNUM *a);
|
|
.Ve
|
|
.SH "DESCRIPTION"
|
|
.IX Header "DESCRIPTION"
|
|
\&\fIBN_set_bit()\fR sets bit \fBn\fR in \fBa\fR to 1 (\f(CW\*(C`a|=(1<<n)\*(C'\fR). The
|
|
number is expanded if necessary.
|
|
.PP
|
|
\&\fIBN_clear_bit()\fR sets bit \fBn\fR in \fBa\fR to 0 (\f(CW\*(C`a&=~(1<<n)\*(C'\fR). An
|
|
error occurs if \fBa\fR is shorter than \fBn\fR bits.
|
|
.PP
|
|
\&\fIBN_is_bit_set()\fR tests if bit \fBn\fR in \fBa\fR is set.
|
|
.PP
|
|
\&\fIBN_mask_bits()\fR truncates \fBa\fR to an \fBn\fR bit number
|
|
(\f(CW\*(C`a&=~((~0)>>n)\*(C'\fR). An error occurs if \fBa\fR already is
|
|
shorter than \fBn\fR bits.
|
|
.PP
|
|
\&\fIBN_lshift()\fR shifts \fBa\fR left by \fBn\fR bits and places the result in
|
|
\&\fBr\fR (\f(CW\*(C`r=a*2^n\*(C'\fR). \fIBN_lshift1()\fR shifts \fBa\fR left by one and places
|
|
the result in \fBr\fR (\f(CW\*(C`r=2*a\*(C'\fR).
|
|
.PP
|
|
\&\fIBN_rshift()\fR shifts \fBa\fR right by \fBn\fR bits and places the result in
|
|
\&\fBr\fR (\f(CW\*(C`r=a/2^n\*(C'\fR). \fIBN_rshift1()\fR shifts \fBa\fR right by one and places
|
|
the result in \fBr\fR (\f(CW\*(C`r=a/2\*(C'\fR).
|
|
.PP
|
|
For the shift functions, \fBr\fR and \fBa\fR may be the same variable.
|
|
.SH "RETURN VALUES"
|
|
.IX Header "RETURN VALUES"
|
|
\&\fIBN_is_bit_set()\fR returns 1 if the bit is set, 0 otherwise.
|
|
.PP
|
|
All other functions return 1 for success, 0 on error. The error codes
|
|
can be obtained by ERR_get_error(3).
|
|
.SH "SEE ALSO"
|
|
.IX Header "SEE ALSO"
|
|
openssl_bn(3), BN_num_bytes(3), BN_add(3)
|
|
.SH "HISTORY"
|
|
.IX Header "HISTORY"
|
|
\&\fIBN_set_bit()\fR, \fIBN_clear_bit()\fR, \fIBN_is_bit_set()\fR, \fIBN_mask_bits()\fR,
|
|
\&\fIBN_lshift()\fR, \fIBN_lshift1()\fR, \fIBN_rshift()\fR, and \fIBN_rshift1()\fR are available
|
|
in all versions of SSLeay and OpenSSL.
|