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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_init(BN_CTX *c); void BN_CTX_free(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_init() initializes an existing uninitialized B<BN_CTX>. 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(). =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