/usr/man/cat.3/BN_CTX_free.3

BN_CTX_new(3)                OpenSSL                BN_CTX_new(3)

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.

1.0.2t               Last change: 2019-09-10                    1

See also BN_CTX_init(3)
See also BN_CTX_new(3)