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=pod
=head1 NAME
BN_new, BN_clear, BN_free, BN_clear_free - allocate and free BIGNUMs
=head1 SYNOPSIS
#include <openssl/bn.h>
BIGNUM *BN_new(void);
void BN_clear(BIGNUM *a);
void BN_free(BIGNUM *a);
void BN_clear_free(BIGNUM *a);
=head1 DESCRIPTION
BN_new() allocates and initializes a B<BIGNUM> structure.
BN_clear() is used to destroy sensitive data such as keys when they
are no longer needed. It erases the memory used by B<a> and sets it
to the value 0.
BN_free() frees the components of the B<BIGNUM>, and if it was created
by BN_new(), also the structure itself. BN_clear_free() additionally
overwrites the data before the memory is returned to the system.
If B<a> is NULL, nothing is done.
=head1 RETURN VALUES
BN_new() returns a pointer to the B<BIGNUM>. If the allocation fails,
it returns B<NULL> and sets an error code that can be obtained
by L<ERR_get_error(3)>.
BN_clear(), BN_free() and BN_clear_free() have no return values.
=head1 SEE ALSO
L<bn(3)>, L<ERR_get_error(3)>
=head1 HISTORY
BN_init() was removed in OpenSSL 1.1.0; use BN_new() instead.
=cut
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