NAME

       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_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 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.

SEE ALSO

       bn(3), ERR_get_error(3), BN_add(3), BN_CTX_start(3)

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.

1.0.2g                                             2016-03-01                                   BN_CTX_new(3SSL)