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BN_new.3
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.\" 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_new, BN_init, BN_clear, BN_free, BN_clear_free \- allocate and free BIGNUMs .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/bn.h> \& \& BIGNUM *BN_new(void); \& \& void BN_init(BIGNUM *); \& \& void BN_clear(BIGNUM *a); \& \& void BN_free(BIGNUM *a); \& \& void BN_clear_free(BIGNUM *a); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\fBBN_new()\fR allocates and initializes a \fB\s-1BIGNUM\s0\fR structure. \fBBN_init()\fR initializes an existing uninitialized \fB\s-1BIGNUM\s0\fR. .PP \&\fBBN_clear()\fR is used to destroy sensitive data such as keys when they are no longer needed. It erases the memory used by \fBa\fR and sets it to the value 0. .PP \&\fBBN_free()\fR frees the components of the \fB\s-1BIGNUM\s0\fR, and if it was created by \fBBN_new()\fR, also the structure itself. \fBBN_clear_free()\fR additionally overwrites the data before the memory is returned to the system. If \fBa\fR is \s-1NULL,\s0 nothing is done. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBBN_new()\fR returns a pointer to the \fB\s-1BIGNUM\s0\fR initialised to the value 0. If the allocation fails, it returns \fB\s-1NULL\s0\fR and sets an error code that can be obtained by \fBERR_get_error\fR\|(3). .PP \&\fBBN_init()\fR, \fBBN_clear()\fR, \fBBN_free()\fR and \fBBN_clear_free()\fR have no return values. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBbn\fR\|(3), \fBERR_get_error\fR\|(3) .SH "HISTORY" .IX Header "HISTORY" \&\fBBN_new()\fR, \fBBN_clear()\fR, \fBBN_free()\fR and \fBBN_clear_free()\fR are available in all versions on SSLeay and OpenSSL. \fBBN_init()\fR was added in SSLeay 0.9.1b.