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The Montgomery ladder may be used to perform any operation that is
isomorphic to exponentiation, i.e. to compute the result
r = g^e = g * g * g * g * .... * g
for an arbitrary commutative operation "*", base or generator "g", and
exponent "e".
Implement a generic Montgomery ladder for use by both modular
exponentiation and elliptic curve point multiplication (both of which
are isomorphic to exponentiation).
Signed-off-by: Michael Brown <mcb30@ipxe.org>