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calculations in projective coordinates

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orignal 2015-11-05 15:02:10 -05:00
parent 962261fee7
commit d50ba1259c
2 changed files with 104 additions and 91 deletions
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24
Signature.h
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@ -371,32 +371,34 @@ namespace crypto
struct EDDSAPoint
{
BIGNUM * x, * y;
EDDSAPoint (): x(nullptr), y(nullptr) {};
EDDSAPoint (EDDSAPoint&& other): x(nullptr), y(nullptr)
BIGNUM * z, * t; // projective coordinates
EDDSAPoint (): x(nullptr), y(nullptr), z(nullptr), t(nullptr) {};
EDDSAPoint (EDDSAPoint&& other): x(nullptr), y(nullptr), z(nullptr), t(nullptr)
{ *this = std::move (other); };
EDDSAPoint (BIGNUM * x1, BIGNUM * y1): x(x1), y(y1) {};
~EDDSAPoint () { BN_free (x); BN_free (y); };
EDDSAPoint (BIGNUM * x1, BIGNUM * y1, BIGNUM * z1 = nullptr, BIGNUM * t1 = nullptr): x(x1), y(y1), z(z1), t(t1) {};
~EDDSAPoint () { BN_free (x); BN_free (y); BN_free(z); BN_free(t); };
EDDSAPoint& operator=(EDDSAPoint&& other)
{
if (x) BN_free (x);
if (y) BN_free (y);
if (z) BN_free (z);
if (t) BN_free (t);
x = other.x; other.x = nullptr;
y = other.y; other.y = nullptr;
z = other.z; other.z = nullptr;
t = other.t; other.t = nullptr;
return *this;
}
bool operator==(const EDDSAPoint& other) const
{
return !BN_cmp (x, other.x) && !BN_cmp (y, other.y);
}
EDDSAPoint operator-() const
{
BIGNUM * x1 = NULL, * y1 = NULL;
BIGNUM * x1 = NULL, * y1 = NULL, * z1 = NULL, * t1 = NULL;
if (x) { x1 = BN_dup (x); BN_set_negative (x1, !BN_is_negative (x)); };
if (y) y1 = BN_dup (y);
return EDDSAPoint {x1, y1};
if (z) z1 = BN_dup (z);
if (t) { t1 = BN_dup (t); BN_set_negative (t1, !BN_is_negative (t)); };
return EDDSAPoint {x1, y1, z1, t1};
}
};