[openssl-users] Questions on internal-buffers being used

Benjamin Kaduk bkaduk at akamai.com
Tue Oct 11 19:29:05 UTC 2016

On 10/11/2016 02:06 PM, Ajay Garg wrote:
> Hi All.
> a)
> In the call,
> int BIO_new_bio_pair(BIO **bio1, size_t writebuf1, BIO **bio2, size_t
> writebuf2); are internal-buffers malloc'ed for each of "bio1" and "bio2"?
> If yes, is there a way to pass buffers from the application-layer? I
> ask this, because not all systems possess dynamic-memory allocation
> (or at least "malloc" is not available on all systems).
> b) Irrespective of the values of "writebuf1" and "writebuf2" in a), I
> see that everything works perfect. So, there's got to be some
> internal-buffer that manages the complete ssl-packet, most probably
> instantiated via the call BIO* BIO_new(BIO_f_ssl());
> Here too, is it possible to pass the buffer from application-layer
> (because of same reasons as above)?

You should be able to produce the desired effect with BIO_new_mem_buf()
(twice) and attaching the resulting BIOs to each other with

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