/*
	Copyright (c) 2009-2010 Christopher A. Taylor.  All rights reserved.

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	modification, are permitted provided that the following conditions are met:

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	  this list of conditions and the following disclaimer.
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	  to endorse or promote products derived from this software without
	  specific prior written permission.

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	AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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	ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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*/

#include <cat/math/BigMontgomery.hpp>
#include <cstring>
using namespace cat;

BigMontgomery::BigMontgomery(int regs, int bits)
    : BigRTL(regs + MON_OVERHEAD, bits)
{
    mon_regs = regs + MON_OVERHEAD;

    // Reserve a register to contain the full modulus
    CachedModulus = Get(mon_regs - 1);
	TempProduct = Get(mon_regs - 3);
	TempProductHi = TempProduct + library_legs;
}

void BigMontgomery::SetModulus(const Leg *mod)
{
	Copy(mod, CachedModulus);
	mod_inv = MultiplicativeInverseX(-(LegSigned)mod[0]);
}

void BigMontgomery::CopyModulus(Leg *out)
{
	Copy(CachedModulus, out);
}

// Strangely enough, including these all in the same source file improves performance
// in Visual Studio by almost 50%, which is odd because MSVC was one of the first
// compilers to support "link time optimization."

#include "montgomery/reduce/MonInput.cpp"
#include "montgomery/reduce/MonOutput.cpp"
#include "montgomery/reduce/MonReduceProduct.cpp"
#include "montgomery/addsub/MonAdd.cpp"
#include "montgomery/addsub/MonNegate.cpp"
#include "montgomery/addsub/MonSubtract.cpp"
#include "montgomery/mul/MonMultiply.cpp"
#include "montgomery/mul/MonSquare.cpp"
#include "montgomery/expm/MonExpMod.cpp"
#include "montgomery/expm/IsRabinMillerPrime.cpp"
