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0.9.7e/doc/crypto
Page 1 (printed 10/20/05)
BN_CTX_new(3) 25/Sep/2002 (0.9.7e) 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.
Page 1 (printed 10/20/05)
BN_CTX_new(3) 25/Sep/2002 (0.9.7e) BN_CTX_new(3)
Page 2 (printed 10/20/05)
