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=pod
=head1 NAME
BN_new, BN_init, BN_clear, BN_free, BN_clear_free - allocate and free BIGNUMs
=head1 SYNOPSIS
#include
BIGNUM *BN_new(void);
void BN_init(BIGNUM *);
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 structure. BN_init()
initializes an existing uninitialized B.
BN_clear() is used to destroy sensitive data such as keys when they
are no longer needed. It erases the memory used by B and sets it
to the value 0.
BN_free() frees the components of the B, 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.
=head1 RETURN VALUES
BN_new() returns a pointer to the B. If the allocation fails,
it returns B and sets an error code that can be obtained
by L.
BN_init(), BN_clear(), BN_free() and BN_clear_free() have no return
values.
=head1 SEE ALSO
L, L
=head1 HISTORY
BN_new(), BN_clear(), BN_free() and BN_clear_free() are available in
all versions on SSLeay and OpenSSL. BN_init() was added in SSLeay
0.9.1b.
=cut