BN_CTX_start(3)              OpenSSL              BN_CTX_start(3)

NAME
       BN_CTX_start, BN_CTX_get, BN_CTX_end - use temporary
       BIGNUM variables

SYNOPSIS
        #include 

        void BN_CTX_start(BN_CTX *ctx);

        BIGNUM *BN_CTX_get(BN_CTX *ctx);

        void BN_CTX_end(BN_CTX *ctx);

DESCRIPTION
       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.

RETURN VALUES
       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).

SEE ALSO
       BN_CTX_new(3)

HISTORY
       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)

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