Compact qrcrypt.py further

foo.sec

@@ -0,0 +1,2 @@
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qrcrypt.py

@@ -21,8 +21,7 @@ def tag(k,n,c):
 	return w(a+s,128)
 def hcc20(k,n):s=ccb(k,q(n[:4]),n[4:],1);return s[:16]+s[48:]
 p=2**255-19
-mask=lambda x:sum(x>>i|x<<i for i in range(255))
-def cs(s,a,b):d=mask(s)&(a^b);a=a^d;b=b^d;return a,b
+def cs(s,a,b):d=-s&((1<<255)-1)&(a^b);a=a^d;b=b^d;return a,b
 def x(k,u):
 	k=bytearray(k);k[0]&=248;k[31]&=127;k[31]|=64;k=q(k);u=q(u[:-1]+bytes([u[-1]&127]))
 	x=u;y=1;z=0;w=u;v=1;s=0