exponentiation. On the other hand, it // requires computing a GCD of two values that are not coprime, and then // a division, both complex variable-time operations. λ, err := totient(P, Q) if err == errDivisorTooLarge { // The divisor is too large, try again with different primes. continue } if err != nil { return nil, err } e := bigmod.NewNat().SetUint(65537) d, ok := bigmod.NewNat().InverseVarTime(e, λ) if !ok { // This checks that GCD(e, lcm(p-1, q-1)) = 1, which is equivalent // to checking GCD(e,...