http://mmgen-wallet.i2p/project/mmgen/mmgen-wallet/src/e025f2704fca8dfb9ea49126b489fd852d944ee7/mmgen/contrib/ed25519ll_djbec.py
version based on: # http://www.hyperelliptic.org/EFD/g1p/auto-twisted-extended-1.html def xpt_add(pt1, pt2): (X1, Y1, Z1, T1) = pt1 (X2, Y2, Z2, T2) = pt2 A = ((Y1-X1)*(Y2+X2)) % q B = ((Y1+X1)*(Y2-X2)) % q C = (Z1*2*T2) % q D = (T1*2*Z2) % q E = (D+C) % q F = (B-A) % q G = (B+A) % q H = (D-C) % q X3 = (E*F) % q Y3 = (G*H) % q Z3 = (F*G) % q T3 = (E*H) % q return (X3, Y3, Z3, T3) def xpt_double (pt): (X1, Y1, Z1, _) = pt A = (X1*X1) B = (Y1*Y1) C = (2*Z1*Z1) D = (-A) % q J...