What decryption algorithm does wireshark use?

Question

PHP

It is necessary to implement a traffic decryption method in php. Wireshark is taken as an example.
Data to me is encoded in base64. When decoding, it turns out something like: ��b☺ls_�❂M9�۸U�eQX�f9'���cz �2�BY26����l�|p+�☹
but I want it like in wireshark

Hence the question is like wireshark decode data? What algorithm

Answer 1

but I want it like in wireshark

In wireshark, in this case, the usual hexdump format. Is he really needed? Or is it a question of decrypting raw TCP / IP packets?

Answer 2

Wireshark uses parsers for each type of packet.
Each type of packet is described in the RFC, in fact, take the description from there
For TCP
https://tools.ietf.org/html/rfc793
3.1