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BN_CTX_start(3) OpenSSL BN_CTX_start(3)
BN_CTX_start, BN_CTX_get, BN_CTX_end - use temporary
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 vari-
ables 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 call-
ing 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
BN_CTX_start(), BN_CTX_get() and BN_CTX_end() were added
in OpenSSL 0.9.5.
0.9.7c 2000-07-11 BN_CTX_start(3)
Time taken: 0.35443 seconds
Created with the man page lookup class by Andrew Collington,