MirBSD manpage: BN_CTX_end(3), BN_CTX_get(3), BN_CTX_start(3)

BN_CTX_START(3)              OpenSSL              BN_CTX_START(3)


     BN_CTX_start, BN_CTX_get, BN_CTX_end - use temporary BIGNUM


      #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 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 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




     BN_CTX_start(), BN_CTX_get() and BN_CTX_end() were added in
     OpenSSL 0.9.5.

MirBSD #10-current         2005-02-05                           1

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