BN_CTX_new, BN_CTX_init, BN_CTX_free - Allocate and free
void ); void BN_CTX_init(
BN_CTX *c ); void BN_CTX_free(
BN_CTX *c );
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().
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
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.
Functions: bn(3), err(3), BN_add(3), BN_CTX_start(3)
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