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- =pod
- =head1 NAME
- BN_CTX_new, BN_CTX_init, BN_CTX_free - allocate and free BN_CTX structures
- =head1 SYNOPSIS
- #include <openssl/bn.h>
- BN_CTX *BN_CTX_new(void);
- void BN_CTX_free(BN_CTX *c);
- Deprecated:
- void BN_CTX_init(BN_CTX *c);
- =head1 DESCRIPTION
- A B<BN_CTX> is a structure that holds B<BIGNUM> temporary variables used by
- library functions. Since dynamic memory allocation to create B<BIGNUM>s
- is rather expensive when used in conjunction with repeated subroutine
- calls, the B<BN_CTX> structure is used.
- BN_CTX_new() allocates and initializes a B<BN_CTX>
- structure.
- BN_CTX_free() frees the components of the B<BN_CTX>, and if it was
- created by BN_CTX_new(), also the structure itself.
- If L<BN_CTX_start(3)|BN_CTX_start(3)> has been used on the B<BN_CTX>,
- L<BN_CTX_end(3)|BN_CTX_end(3)> must be called before the B<BN_CTX>
- may be freed by BN_CTX_free().
- BN_CTX_init() (deprecated) initializes an existing uninitialized B<BN_CTX>.
- This should not be used for new programs. Use BN_CTX_new() instead.
- =head1 RETURN VALUES
- BN_CTX_new() returns a pointer to the B<BN_CTX>. 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_CTX_init() and BN_CTX_free() have no return values.
- =head1 SEE ALSO
- L<bn(3)|bn(3)>, L<ERR_get_error(3)|ERR_get_error(3)>, L<BN_add(3)|BN_add(3)>,
- L<BN_CTX_start(3)|BN_CTX_start(3)>
- =head1 HISTORY
- BN_CTX_new() and BN_CTX_free() are available in all versions on SSLeay
- and OpenSSL. BN_CTX_init() was added in SSLeay 0.9.1b.
- =cut
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