I am trying to tweak openssl-master client to test a tls1.3 enabled server.
I want to club the client certificate, client key exchange , change cipher spec and certificate verify into single handshake message.( So that the record shows up as multiple handshake messages).
OpenSSL Version : OpenSSL 1.1.1-dev xx XXX xxxx.
After going through the code I understand the new tls1.3 implemented OpenSSL code is using WPACKET API to frame the records. I need help in understanding what the following functions do. I am new to the mailing list, thanks in advance.
Basically what does the word _sub_ mean in these functions and how do that differ from the non sub function say
Difference between WPACKET_sub_memcpy__ and WPACKET_memcpy__
Please feel free to reply if something is not understandable.