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+.\" Automatically generated by Pod::Man version 1.15
+.\" Thu May  9 13:16:14 2002
+.\"
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+.\" ======================================================================
+.\"
+.IX Title "BN_CTX_NEW 1"
+.TH BN_CTX_NEW 1 "perl v5.6.1" "2000-04-13" "User Contributed Perl Documentation"
+.UC
+.SH "NAME"
+BN_CTX_new, BN_CTX_init, BN_CTX_free \- allocate and free \s-1BN_CTX\s0 structures
+.SH "SYNOPSIS"
+.IX Header "SYNOPSIS"
+.Vb 1
+\& #include <openssl/bn.h>
+.Ve
+.Vb 1
+\& BN_CTX *BN_CTX_new(void);
+.Ve
+.Vb 1
+\& void BN_CTX_init(BN_CTX *c);
+.Ve
+.Vb 1
+\& void BN_CTX_free(BN_CTX *c);
+.Ve
+.SH "DESCRIPTION"
+.IX Header "DESCRIPTION"
+A \fB\s-1BN_CTX\s0\fR is a structure that holds \fB\s-1BIGNUM\s0\fR temporary variables used by
+library functions. Since dynamic memory allocation to create \fB\s-1BIGNUM\s0\fRs
+is rather expensive when used in conjunction with repeated subroutine
+calls, the \fB\s-1BN_CTX\s0\fR structure is used.
+.PP
+\&\fIBN_CTX_new()\fR allocates and initializes a \fB\s-1BN_CTX\s0\fR
+structure. \fIBN_CTX_init()\fR initializes an existing uninitialized
+\&\fB\s-1BN_CTX\s0\fR.
+.PP
+\&\fIBN_CTX_free()\fR frees the components of the \fB\s-1BN_CTX\s0\fR, and if it was
+created by \fIBN_CTX_new()\fR, also the structure itself.
+If BN_CTX_start(3) has been used on the \fB\s-1BN_CTX\s0\fR,
+BN_CTX_end(3) must be called before the \fB\s-1BN_CTX\s0\fR
+may be freed by \fIBN_CTX_free()\fR.
+.SH "RETURN VALUES"
+.IX Header "RETURN VALUES"
+\&\fIBN_CTX_new()\fR returns a pointer to the \fB\s-1BN_CTX\s0\fR. If the allocation fails,
+it returns \fB\s-1NULL\s0\fR and sets an error code that can be obtained by
+ERR_get_error(3).
+.PP
+\&\fIBN_CTX_init()\fR and \fIBN_CTX_free()\fR have no return values.
+.SH "SEE ALSO"
+.IX Header "SEE ALSO"
+bn(3), err(3), BN_add(3),
+BN_CTX_start(3)
+.SH "HISTORY"
+.IX Header "HISTORY"
+\&\fIBN_CTX_new()\fR and \fIBN_CTX_free()\fR are available in all versions on SSLeay
+and OpenSSL. \fIBN_CTX_init()\fR was added in SSLeay 0.9.1b.