Linux 2.6 - man page for bn_ctx_get (linux section 3SSL)
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BN_CTX_start(3SSL) OpenSSL BN_CTX_start(3SSL)
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.
1.0.0e 2000-07-11 BN_CTX_start(3SSL)
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