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NAMEBN_CTX_new, BN_CTX_init, BN_CTX_free - allocate and free BN_CTX structures
#include <openssl/bn.h> BN_CTX *BN_CTX_new(void); void BN_CTX_free(BN_CTX *c);
void BN_CTX_init(BN_CTX *c);
BN_CTXis a structure that holds
BIGNUMtemporary 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_CTXstructure is used.
BN_CTX_new() allocates and initializes a
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_CTXmay 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 VALUESBN_CTX_new() returns a pointer to the
BN_CTX. If the allocation fails, it returns
NULLand sets an error code that can be obtained by ERR_get_error(3).
BN_CTX_init() and BN_CTX_free() have no return values.