Manual Reference Pages - BN_CTX_START (3)
BN_CTX_start, BN_CTX_get, BN_CTX_end - use temporary BIGNUM variables
void BN_CTX_start(BN_CTX *ctx);
BIGNUM *BN_CTX_get(BN_CTX *ctx);
void BN_CTX_end(BN_CTX *ctx);
These functions are used to obtain temporary BIGNUM variables from
a BN_CTX (which can been created by using BN_CTX_new(3))
in order to save the overhead of repeatedly creating and
freeing BIGNUMs in functions that are called from inside a loop.
A function must call BN_CTX_start() first. Then, BN_CTX_get() may be
called repeatedly to obtain temporary BIGNUMs. All BN_CTX_get()
calls must be made before calling any other functions that use the
ctx as an argument.
Finally, BN_CTX_end() must be called before returning from the function.
When BN_CTX_end() is called, the BIGNUM pointers obtained from
BN_CTX_get() become invalid.
BN_CTX_start() and BN_CTX_end() return no values.
BN_CTX_get() returns a pointer to the BIGNUM, or NULL on error.
Once BN_CTX_get() has failed, the subsequent calls will return NULL
as well, so it is sufficient to check the return value of the last
BN_CTX_get() call. In case of an error, an error code is set, which
can be obtained by ERR_get_error(3).
BN_CTX_start(), BN_CTX_get() and BN_CTX_end() were added in OpenSSL 0.9.5.
|1.0.1s ||BN_CTX_START (3) ||2016-03-01 |
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