Max SMB signing key length

Stefan (metze) Metzmacher metze at samba.org
Thu Mar 18 11:03:41 MDT 2010


Hi Andrew,

do you know what the maximum length of the SMB signing key could be?

I know with extended security (NTLMSSP 16 bytes or krb5 8-32 bytes)
it's easy.

But without extended security we calculate the signing key
out of the user_session_key and the nt or lm response blob.
I assume the user_session_key is always 16 byte, but what is the max
size of the response blob?

metze

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