* need to be all held in memory at once. When the BIO is flushed the output
* is finalized and any signatures etc written out. The BIO is a 'proper'
* BIO and can handle non blocking I/O correctly. The usage is simple. The
* need to be all held in memory at once. When the BIO is flushed the output
* is finalized and any signatures etc written out. The BIO is a 'proper'
* BIO and can handle non blocking I/O correctly. The usage is simple. The