{ return nil, nil, errors.New("extendedGCD: both a and m are even") } size := max(len(a.limbs), len(m.limbs)) u = NewNat().set(a).expand(size) v := NewNat().set(m).expand(size) A = NewNat().reset(len(m.limbs)) A.limbs[0] = 1 B := NewNat().reset(len(a.limbs)) C := NewNat().reset(len(m.limbs)) D := NewNat().reset(len(a.limbs)) D.limbs[0] = 1 // Before and after each loop iteration, the following hold: // // u = A*a - B*m // v = D*m - C*a // 0 < u <= a // 0 <= v <= m // 0 <= A < m // 0 <= B <= a // 0...

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