sept-s: fix building without keys (output won't work though)

sept/sept-secondary/KEYS_template.py

@@ -0,0 +1,7 @@
+HOVI_ENC_KEY_PRD = '00000000000000000000000000000000'.decode('hex')
+HOVI_ENC_KEY_DEV = '00000000000000000000000000000000'.decode('hex')
+HOVI_SIG_KEY_PRD = '00000000000000000000000000000000'.decode('hex')
+HOVI_SIG_KEY_DEV = '00000000000000000000000000000000'.decode('hex')
+HOVI_KEK_KEY_PRD = '00000000000000000000000000000000'.decode('hex')
+HOVI_KEK_KEY_DEV = '00000000000000000000000000000000'.decode('hex')
+IV               = '00000000000000000000000000000000'.decode('hex')

sept/sept-secondary/Makefile

@@ -132,7 +132,7 @@ clean:
 
 #---------------------------------------------------------------------------------
 else
-.PHONY:	all
+.PHONY:	all $(OUTPUT).enc
 
 DEPENDS	:=	$(OFILES:.o=.d)
 

sept/sept-secondary/sept_sign.py

@@ -3,7 +3,11 @@ import sys
 from struct import pack as pk, unpack as up
 from Crypto.Cipher import AES
 from Crypto.Hash import CMAC
-import KEYS
+try:
+    import KEYS
+except ImportError:
+    import KEYS_template as KEYS
+    print('Warning: output will not work on 7.0.0+!')
 
 def shift_left_xor_rb(s):
     N = int(s.encode('hex'), 16)