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/*
* Elliptic curves over GF(p)
*
* (C) 2007 Martin Doering, Christoph Ludwig, Falko Strenzke
* 2008-2010 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <botan/curve_gfp.h>
#include <botan/bigint.h>
#include <assert.h>
#include <ostream>
namespace Botan {
CurveGFp::CurveGFp(const GFpElement& a, const GFpElement& b,
const BigInt& p) :
modulus(p), mA(a), mB(b)
{
if(p != mA.get_p() || p != mB.get_p())
throw Invalid_Argument("could not construct curve: moduli of arguments differ");
}
// swaps the states of *this and other, does not throw
void CurveGFp::swap(CurveGFp& other)
{
std::swap(mA, other.mA);
std::swap(mB, other.mB);
std::swap(modulus, other.modulus);
}
bool operator==(const CurveGFp& lhs, const CurveGFp& rhs)
{
return (lhs.get_p() == rhs.get_p() &&
lhs.get_a() == rhs.get_a() &&
lhs.get_b() == rhs.get_b());
}
std::ostream& operator<<(std::ostream& output, const CurveGFp& elem)
{
return output << "y^2 = x^3 + (" << elem.get_a() << ")x + (" << elem.get_b() << ")";
}
}
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