267 lines
6.4 KiB
Groff
267 lines
6.4 KiB
Groff
.rn '' }`
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'''
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'''
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.de Sh
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.br
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..
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'''
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'''
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''' Set up \*(-- to give an unbreakable dash;
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''' string Tr holds user defined translation string.
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''' Bell System Logo is used as a dummy character.
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'''
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.tr \(*W-|\(bv\*(Tr
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.ie n \{\
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.ds -- \(*W-
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.ds PI pi
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.if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch
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''' \*(M", \*(S", \*(N" and \*(T" are the equivalent of
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''' \*(L" and \*(R", except that they are used on ".xx" lines,
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''' such as .IP and .SH, which do another additional levels of
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''' double-quote interpretation
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.\" If the F register is turned on, we'll generate
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.\" index entries out stderr for the following things:
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.\" TH Title
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.\" SH Header
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.\" Sh Subsection
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.\" Ip Item
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.\" X<> Xref (embedded
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.\" Of course, you have to process the output yourself
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.\" in some meaninful fashion.
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.if \nF \{
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.de IX
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.nr % 0
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.rr F
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.\}
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.TH BN_set_bit 3 "0.9.5a" "22/Jul/100" "OpenSSL"
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.UC
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.if n .hy 0
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.if n .na
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.ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p'
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.de CQ \" put $1 in typewriter font
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.ft CW
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'if n "\c
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'if t \\&\\$1\c
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'if n \\&\\$1\c
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'if n \&"
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\\&\\$2 \\$3 \\$4 \\$5 \\$6 \\$7
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'.ft R
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..
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.\" @(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2
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. \" AM - accent mark definitions
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.bd B 3
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. \" fudge factors for nroff and troff
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.if t \{\
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.if v .ds ~ \\k:\h'-(\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\n:u'
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.if v .ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'\v'-.4m'^\v'.4m'\h'|\\n:u'
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. \" for low resolution devices (crt and lpr)
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.if \n(.H>23 .if \n(.V>19 \
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\{\
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.\}
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.rm #[ #] #H #V #F C
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.SH "NAME"
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BN_set_bit, BN_clear_bit, BN_is_bit_set, BN_mask_bits, BN_lshift,
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BN_lshift1, BN_rshift, BN_rshift1 \- bit operations on BIGNUMs
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.SH "LIBRARY"
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libcrypto, -lcrypto
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.SH "SYNOPSIS"
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.PP
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.Vb 1
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\& #include <openssl/bn.h>
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.Ve
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.Vb 2
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\& int BN_set_bit(BIGNUM *a, int n);
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\& int BN_clear_bit(BIGNUM *a, int n);
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.Ve
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.Vb 1
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\& int BN_is_bit_set(const BIGNUM *a, int n);
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.Ve
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.Vb 1
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\& int BN_mask_bits(BIGNUM *a, int n);
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.Ve
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.Vb 2
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\& int BN_lshift(BIGNUM *r, const BIGNUM *a, int n);
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\& int BN_lshift1(BIGNUM *r, BIGNUM *a);
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.Ve
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.Vb 2
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\& int BN_rshift(BIGNUM *r, BIGNUM *a, int n);
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\& int BN_rshift1(BIGNUM *r, BIGNUM *a);
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.Ve
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.SH "DESCRIPTION"
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\fIBN_set_bit()\fR sets bit \fBn\fR in \fBa\fR to 1 (\f(CWa|=(1<<n)\fR). The
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number is expanded if necessary.
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.PP
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\fIBN_clear_bit()\fR sets bit \fBn\fR in \fBa\fR to 0 (\f(CWa&=~(1<<n)\fR). An
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error occurs if \fBa\fR is shorter than \fBn\fR bits.
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.PP
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\fIBN_is_bit_set()\fR tests if bit \fBn\fR in \fBa\fR is set.
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.PP
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\fIBN_mask_bits()\fR truncates \fBa\fR to an \fBn\fR bit number
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(\f(CWa&=~((~0)>>n)\fR). An error occurs if \fBa\fR already is
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shorter than \fBn\fR bits.
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.PP
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\fIBN_lshift()\fR shifts \fBa\fR left by \fBn\fR bits and places the result in
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\fBr\fR (\f(CWr=a*2^n\fR). \fIBN_lshift1()\fR shifts \fBa\fR left by one and places
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the result in \fBr\fR (\f(CWr=2*a\fR).
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.PP
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\fIBN_rshift()\fR shifts \fBa\fR right by \fBn\fR bits and places the result in
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\fBr\fR (\f(CWr=a/2^n\fR). \fIBN_rshift1()\fR shifts \fBa\fR right by one and places
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the result in \fBr\fR (\f(CWr=a/2\fR).
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.PP
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For the shift functions, \fBr\fR and \fBa\fR may be the same variable.
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.SH "RETURN VALUES"
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\fIBN_is_bit_set()\fR returns 1 if the bit is set, 0 otherwise.
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.PP
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All other functions return 1 for success, 0 on error. The error codes
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can be obtained by the \fIERR_get_error(3)|ERR_get_error(3)\fR manpage.
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.SH "SEE ALSO"
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the \fIbn(3)|bn(3)\fR manpage, the \fIBN_num_bytes(3)|BN_num_bytes(3)\fR manpage, the \fIBN_add(3)|BN_add(3)\fR manpage
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.SH "HISTORY"
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\fIBN_set_bit()\fR, \fIBN_clear_bit()\fR, \fIBN_is_bit_set()\fR, \fIBN_mask_bits()\fR,
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\fIBN_lshift()\fR, \fIBN_lshift1()\fR, \fIBN_rshift()\fR, and \fIBN_rshift1()\fR are available
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in all versions of SSLeay and OpenSSL.
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.rn }` ''
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.IX Title "BN_set_bit 3"
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.IX Name "BN_set_bit, BN_clear_bit, BN_is_bit_set, BN_mask_bits, BN_lshift,
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BN_lshift1, BN_rshift, BN_rshift1 - bit operations on BIGNUMs"
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.IX Header "NAME"
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.IX Header "SYNOPSIS"
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.IX Header "DESCRIPTION"
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.IX Header "RETURN VALUES"
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.IX Header "SEE ALSO"
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.IX Header "HISTORY"
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