BN_CTX_free (3)

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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 is a structure that holds temporary variables used by library functions. Since dynamic memory allocation to create s is rather expensive when used in conjunction with repeated subroutine calls, the structure is used.

BN_CTX_new() allocates and initializes a

structure.

BN_CTX_free() frees the components of the

, 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_end(3) must be called before the may be freed by BN_CTX_free().

BN_CTX_init() (deprecated) initializes an existing uninitialized

. This should not be used for new programs. Use BN_CTX_new() instead.

RETURN VALUES

BN_CTX_new() returns a pointer to the . If the allocation fails, it returns 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.