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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.

  The BN_CTX_new() function allocates and initializes a BN_CTX structure. The
  BN_CTX_init() function initializes an existing uninitialized BN_CTX.

  The BN_CTX_free() function frees the components of the BN_CTX, and if it
  was created by BN_CTX_new(), also the structure itself. If BN_CTX_start()
  has been used on the BN_CTX, BN_CTX_end() 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().

  The BN_CTX_init() and BN_CTX_free() functions have no return values.


HISTORY

  The BN_CTX_new() and BN_CTX_free() functions are available in all versions
  on SSLeay and OpenSSL. The BN_CTX_init() function was added in SSLeay
  0.9.1b.


SEE ALSO

  Functions: bn(3), err(3), BN_add(3), BN_CTX_start(3)

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