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+source 2008 Hisil--Wong--Carter--Dawson, http://eprint.iacr.org/2008/522, Section 3.2, plus assumption Z1=1
+appliesto extended-1
+assume Z1 = 1
+assume Z2 = 1
+compute A = (Y1-X1)(Y2+X2)
+compute B = (Y1+X1)(Y2-X2)
+compute C = 2 T2
+compute D = 2 T1
+compute E = D + C
+compute F = B - A
+compute G = B + A
+compute H = D - C
+compute X3 = E F
+compute Y3 = G H
+compute T3 = E H
+compute Z3 = F G