PS2 Random Function Name Letter Only for First Character (#172)

* fix non-ascii filename downloading error.when download files with non-ascii filename,the 'length' part in the packet is the length of string but not bytes,so throw an index-out-of-bounts error

* fix TLS cipher suite random choice not compatible with powershell 2 on windows 7

* Fix for PS2 function name issue #169

Co-authored-by: tyraniter <tyraniter@gmail.com>

setup/setup_database.py

@@ -188,8 +188,8 @@
     "Invoke_Mimikatz" text 
 )''')
 
-rand1 = ''.join(random.choice(string.ascii_uppercase + string.digits) for _ in range(5))
-rand2 = ''.join(random.choice(string.ascii_uppercase + string.digits) for _ in range(5))
+rand1 = random.choice(string.ascii_uppercase) + ''.join(random.choice(string.ascii_uppercase + string.digits) for _ in range(4))
+rand2 = random.choice(string.ascii_uppercase) + ''.join(random.choice(string.ascii_uppercase + string.digits) for _ in range(4))
 c.execute("INSERT INTO functions VALUES(?,?)", (rand1, rand2))
 
 # commit the changes and close everything off