=pod
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=head1 NAME
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BN_new, BN_init, BN_clear, BN_free, BN_clear_free - allocate and free BIGNUMs
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=head1 SYNOPSIS
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#include <openssl/bn.h>
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BIGNUM *BN_new(void);
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void BN_init(BIGNUM *);
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void BN_clear(BIGNUM *a);
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void BN_free(BIGNUM *a);
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void BN_clear_free(BIGNUM *a);
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=head1 DESCRIPTION
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BN_new() allocates and initializes a B<BIGNUM> structure. BN_init()
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initializes an existing uninitialized B<BIGNUM>.
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BN_clear() is used to destroy sensitive data such as keys when they
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are no longer needed. It erases the memory used by B<a> and sets it
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to the value 0.
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BN_free() frees the components of the B<BIGNUM>, and if it was created
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by BN_new(), also the structure itself. BN_clear_free() additionally
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overwrites the data before the memory is returned to the system.
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=head1 RETURN VALUES
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BN_new() returns a pointer to the B<BIGNUM>. If the allocation fails,
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it returns B<NULL> and sets an error code that can be obtained
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by L<ERR_get_error(3)|ERR_get_error(3)>.
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BN_init(), BN_clear(), BN_free() and BN_clear_free() have no return
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values.
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=head1 SEE ALSO
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L<bn(3)|bn(3)>, L<ERR_get_error(3)|ERR_get_error(3)>
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=head1 HISTORY
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BN_new(), BN_clear(), BN_free() and BN_clear_free() are available in
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all versions on SSLeay and OpenSSL. BN_init() was added in SSLeay
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0.9.1b.
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=cut
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