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CentOS 7.0 - man page for bn_ctx_get (centos section 3)

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BN_CTX_start(3) 			     OpenSSL				  BN_CTX_start(3)

       BN_CTX_start, BN_CTX_get, BN_CTX_end - use temporary BIGNUM variables

	#include <openssl/bn.h>

	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.

1.0.1e					    2013-02-11				  BN_CTX_start(3)
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