BN_CTX_NEW(3) BSD Library Functions Manual BN_CTX_NEW(3)NAME
BN_CTX_new, BN_CTX_init, BN_CTX_free — allocate and free BN_CTX struc‐
tures
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);
DESCRIPTION
A BN_CTX is a structure that holds BIGNUM temporary variables used by
library functions. Since dynamic memory allocation to create BIGNUMs is
rather expensive when used in conjunction with repeated subroutine calls,
the BN_CTX structure is used.
BN_CTX_new() allocates and initializes a BN_CTX structure.
BN_CTX_free() frees the components of the BN_CTX, and if it was created
by BN_CTX_new(), also the structure itself. If BN_CTX_start(3) has been
used on the BN_CTX, BN_CTX_end(3) must be called before the BN_CTX may be
freed by BN_CTX_free().
BN_CTX_init() (deprecated) initializes an existing uninitialized BN_CTX.
This should not be used for new programs. Use BN_CTX_new() instead.
RETURN VALUESBN_CTX_new() returns a pointer to the BN_CTX. If the allocation fails,
it returns NULL and sets an error code that can be obtained by
ERR_get_error(3).
BN_CTX_init() and BN_CTX_free() return no value.
SEE ALSObn(3), BN_add(3), BN_CTX_start(3), ERR_get_error(3)HISTORYBN_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.
BSD May 13, 2024 BSD