Before Wireshark 3.3.0 (September 2020): Due to how key generation works, the trace needs to have the initial connection packets (NegProt and SessSetup) present in the trace being decrypted (done using the right session id).SMB3.1.1 AES-128 CCM decryption added in Wireshark 3.0.0 (February 2019).SMB3.0 AES-128 CCM decryption added in Wireshark 2.6.5 (December 2018). The cryptographic key is less than 16 bytes, it is right-padded with zero bytes. Session.SessionKey: The first 16 bytes of the cryptographic key for this authenticated context. It is not the same as the CIFS SessionKey. The session key in this context refers to the cryptographic session keys used in authentication and message signing. Starting from Wireshark 2.5.0 (released Feb 2018) you can pass a list of SessionId -> SessionKey mappings via a table in the SMB2 preferences or command-line.
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