[openssl-users] SSL_read preserving message boundaries.

[Dr. Stephen Henson]

On Sat, Mar 07, 2015, dE wrote:

> 
> Suppose, I write a small amount of data with SSL_write. Will openssl
> accumulate these writes to make a single big fragment and then send
> it, or will it send it the moment it receives the data, as a single
> fragment?

No it tries to send the data with each call. That's because you might (for
example) be using a character mode application which should send each keypress
as soon as possible.

If you use BIOs you can make use of a buffering BIO which will accumulate
writes until either the buffer is full or you explicitly flush it.

Steve.
--
Dr Stephen N. Henson. OpenSSL project core developer.
Commercial tech support now available see: http://www.openssl.org