iOS Manual Pages

This document is a Mac OS X manual page. Manual pages are a command-line technology for providing documentation. You can view these manual pages locally using the man(1) command. These manual pages come from many different sources, and thus, have a variety of writing styles.

For more information about the manual page format, see the manual page for manpages(5).

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_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.

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.



0.9.7l                            2002-09-25                     BN_CTX_new(3)