BN_CTX_new, BN_CTX_init, BN_CTX_free -- allocate and free BN_CTX structures
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);
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_init() initializes an
existing uninitialized BN_CTX.
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().
RETURN VALUES
BN_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() have no return values.
