expected20 revision 1.1 
11.1Swiz1. tag & 0x3f
21.1Swiz2. len
31.1Swiz
41.1Swizone pass (tag 4)
51.1Swiz========
61.1Swizb version:3
71.1Swizb sig type
81.1Swizb hash alg
91.1Swizb pubkey alg
101.1Swiz8b keyid
111.1Swiz
121.1Swizliteral data (tag 11)
131.1Swiz=============
141.1Swizb binary/text
151.1Swizb length
161.1Swizc string
171.1SwizL mtime
181.1Swiztext
19