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.\" ========================================================================
.\"
.IX Title "BN_new 3"
.TH BN_new 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.
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.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"
\&\fIBN_new()\fR allocates and initializes a \fB\s-1BIGNUM\s0\fR structure. \fIBN_init()\fR
initializes an existing uninitialized \fB\s-1BIGNUM\s0\fR.
.PP
\&\fIBN_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
\&\fIBN_free()\fR frees the components of the \fB\s-1BIGNUM\s0\fR, and if it was created
by \fIBN_new()\fR, also the structure itself. \fIBN_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"
\&\fIBN_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 \fIERR_get_error\fR\|(3).
.PP
\&\fIBN_init()\fR, \fIBN_clear()\fR, \fIBN_free()\fR and \fIBN_clear_free()\fR have no return
values.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fIbn\fR\|(3), \fIERR_get_error\fR\|(3)
.SH "HISTORY"
.IX Header "HISTORY"
\&\fIBN_new()\fR, \fIBN_clear()\fR, \fIBN_free()\fR and \fIBN_clear_free()\fR are available in
all versions on SSLeay and OpenSSL.  \fIBN_init()\fR was added in SSLeay
0.9.1b.

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