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Edit File : BN_get_word.3ssl \| Size : 5.73 KB
.\" 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++. 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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> \& \& int BN_zero(BIGNUM a); \& int BN_one(BIGNUM a); \& \& const BIGNUM BN_value_one(void); \& \& int BN_set_word(BIGNUM a, BN_ULONG w); \& 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 optimied 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 \fB\s-1BN_ULONG\s0\fR. .PP \&\fBBN_zero()\fR, \fBBN_one()\fR and \fBBN_set_word()\fR return 1 on success, 0 otherwise. \&\fBBN_value_one()\fR returns the constant. .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\fR\\|(3), \fBBN_bn2bin\fR\\|(3) .SH "HISTORY" .IX Header "HISTORY" \&\fBBN_zero()\fR, \fBBN_one()\fR and \fBBN_set_word()\fR are available in all versions of SSLeay and OpenSSL. \fBBN_value_one()\fR and \fBBN_get_word()\fR were added in SSLeay 0.8. .PP \&\fBBN_value_one()\fR was changed to return a true const \s-1BIGNUM\s0 * in OpenSSL 0.9.7. Back

Edit File : BN_get_word.3ssl | Size : 5.73 KB

.\" Automatically generated by Pod::Man 4.11 (Pod::Simple 3.35)
.\"
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.\" ========================================================================
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.if t .sp .5v
.if n .sp
..
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.ft CW
.nf
.ne \\$1
..
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.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<>.
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.ie \n(.g .ds Aq \(aq
.el       .ds Aq '
.\"
.\" If the F register is >0, we'll generate index entries on stderr for
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.\" entries marked with X<> in POD.  Of course, you'll have to process the
.\" output yourself in some meaningful fashion.
.\"
.\" Avoid warning from groff about undefined register 'F'.
.de IX
..
.nr rF 0
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.\"
.\" Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2).
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.rm #[ #] #H #V #F C
.\" ========================================================================
.\"
.IX Title "BN_zero 3"
.TH BN_zero 3 "2019-12-20" "1.0.2u" "OpenSSL"
.\" For nroff, turn off justification.  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>
\&
\& int BN_zero(BIGNUM *a);
\& int BN_one(BIGNUM *a);
\&
\& const BIGNUM *BN_value_one(void);
\&
\& int BN_set_word(BIGNUM *a, BN_ULONG w);
\& 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 optimied
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 \fB\s-1BN_ULONG\s0\fR.
.PP
\&\fBBN_zero()\fR, \fBBN_one()\fR and \fBBN_set_word()\fR return 1 on success, 0 otherwise.
\&\fBBN_value_one()\fR returns the constant.
.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\fR\|(3), \fBBN_bn2bin\fR\|(3)
.SH "HISTORY"
.IX Header "HISTORY"
\&\fBBN_zero()\fR, \fBBN_one()\fR and \fBBN_set_word()\fR are available in all versions of
SSLeay and OpenSSL. \fBBN_value_one()\fR and \fBBN_get_word()\fR were added in
SSLeay 0.8.
.PP
\&\fBBN_value_one()\fR was changed to return a true const \s-1BIGNUM\s0 * in OpenSSL
0.9.7.

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