path: root/doc/crypto/BN_new.pod
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-=head1 NAME
-BN_new, BN_init, BN_clear, BN_free, BN_clear_free - allocate and free BIGNUMs
-=head1 SYNOPSIS
- #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);
-BN_new() allocates and initializes a B<BIGNUM> structure. BN_init()
-initializes an existing uninitialized B<BIGNUM>.
-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.
-BN_new() returns a pointer to the B<BIGNUM> initialised to the value 0.
-If the allocation fails,
-it returns B<NULL> and sets an error code that can be obtained
-by L<ERR_get_error(3)|ERR_get_error(3)>.
-BN_init(), BN_clear(), BN_free() and BN_clear_free() have no return
-=head1 SEE ALSO
-L<bn(3)|bn(3)>, L<ERR_get_error(3)|ERR_get_error(3)>
-=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