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pull/877/head
Jeffrey Walton 2019-08-10 03:24:52 -04:00
parent 04b2a20c5d
commit 11c5d14f85
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GPG Key ID: B36AB348921B1838
1 changed files with 6 additions and 11 deletions
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17
ecp.cpp
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@ -191,8 +191,6 @@ ECP::Point AdditionFunction::operator()(const ECP::Point& P) const
} }
else if (m_alpha == A_0) else if (m_alpha == A_0)
{ {
const ECP::FieldElement b3 = field.Multiply(b, 3);
// Gyrations attempt to maintain constant-timeness // Gyrations attempt to maintain constant-timeness
// We need either (P.x, P.y, 1) or (0, 1, 0). // We need either (P.x, P.y, 1) or (0, 1, 0).
const Integer x = P.x * IdentityToInteger(!P.identity); const Integer x = P.x * IdentityToInteger(!P.identity);
@ -200,6 +198,7 @@ ECP::Point AdditionFunction::operator()(const ECP::Point& P) const
const Integer z = 1 * IdentityToInteger(!P.identity); const Integer z = 1 * IdentityToInteger(!P.identity);
ProjectivePoint p(x, y, z), r; ProjectivePoint p(x, y, z), r;
const ECP::FieldElement b3 = field.Multiply(b, 3);
ECP::FieldElement t0 = field.Square(Y); ECP::FieldElement t0 = field.Square(Y);
Z3 = field.Add(t0, t0); Z3 = field.Add(t0, t0);
@ -231,9 +230,7 @@ ECP::Point AdditionFunction::operator()(const ECP::Point& P) const
return R; return R;
} }
else if (m_alpha == A_Star) else if (m_alpha == A_Star)
{ {
const ECP::FieldElement b3 = field.Multiply(b, 3);
// Gyrations attempt to maintain constant-timeness // Gyrations attempt to maintain constant-timeness
// We need either (P.x, P.y, 1) or (0, 1, 0). // We need either (P.x, P.y, 1) or (0, 1, 0).
const Integer x = P.x * IdentityToInteger(!P.identity); const Integer x = P.x * IdentityToInteger(!P.identity);
@ -241,6 +238,7 @@ ECP::Point AdditionFunction::operator()(const ECP::Point& P) const
const Integer z = 1 * IdentityToInteger(!P.identity); const Integer z = 1 * IdentityToInteger(!P.identity);
ProjectivePoint p(x, y, z), r; ProjectivePoint p(x, y, z), r;
const ECP::FieldElement b3 = field.Multiply(b, 3);
ECP::FieldElement t0 = field.Square(Y); ECP::FieldElement t0 = field.Square(Y);
Z3 = field.Add(t0, t0); Z3 = field.Add(t0, t0);
@ -364,8 +362,6 @@ ECP::Point AdditionFunction::operator()(const ECP::Point& P, const ECP::Point& Q
} }
else if (m_alpha == A_0) else if (m_alpha == A_0)
{ {
const ECP::FieldElement b3 = field.Multiply(b, 3);
// Gyrations attempt to maintain constant-timeness // Gyrations attempt to maintain constant-timeness
// We need either (P.x, P.y, 1) or (0, 1, 0). // We need either (P.x, P.y, 1) or (0, 1, 0).
const Integer x1 = P.x * IdentityToInteger(!P.identity); const Integer x1 = P.x * IdentityToInteger(!P.identity);
@ -377,6 +373,7 @@ ECP::Point AdditionFunction::operator()(const ECP::Point& P, const ECP::Point& Q
const Integer z2 = 1 * IdentityToInteger(!Q.identity); const Integer z2 = 1 * IdentityToInteger(!Q.identity);
ProjectivePoint p(x1, y1, z1), q(x2, y2, z2), r; ProjectivePoint p(x1, y1, z1), q(x2, y2, z2), r;
const ECP::FieldElement b3 = field.Multiply(b, 3);
ECP::FieldElement t0 = field.Square(Y); ECP::FieldElement t0 = field.Square(Y);
Z3 = field.Add(t0, t0); Z3 = field.Add(t0, t0);
@ -409,8 +406,6 @@ ECP::Point AdditionFunction::operator()(const ECP::Point& P, const ECP::Point& Q
} }
else if (m_alpha == A_Star) else if (m_alpha == A_Star)
{ {
const ECP::FieldElement b3 = field.Multiply(b, 3);
// Gyrations attempt to maintain constant-timeness // Gyrations attempt to maintain constant-timeness
// We need either (P.x, P.y, 1) or (0, 1, 0). // We need either (P.x, P.y, 1) or (0, 1, 0).
const Integer x1 = P.x * IdentityToInteger(!P.identity); const Integer x1 = P.x * IdentityToInteger(!P.identity);
@ -422,6 +417,7 @@ ECP::Point AdditionFunction::operator()(const ECP::Point& P, const ECP::Point& Q
const Integer z2 = 1 * IdentityToInteger(!Q.identity); const Integer z2 = 1 * IdentityToInteger(!Q.identity);
ProjectivePoint p(x1, y1, z1), q(x2, y2, z2), r; ProjectivePoint p(x1, y1, z1), q(x2, y2, z2), r;
const ECP::FieldElement b3 = field.Multiply(b, 3);
ECP::FieldElement t0 = field.Multiply(X1, X2); ECP::FieldElement t0 = field.Multiply(X1, X2);
ECP::FieldElement t1 = field.Multiply(Y1, Y2); ECP::FieldElement t1 = field.Multiply(Y1, Y2);
@ -476,8 +472,6 @@ ECP::Point AdditionFunction::operator()(const ECP::Point& P, const ECP::Point& Q
} }
else // A_Montgomery else // A_Montgomery
{ {
ECP::Point S = R;
// More gyrations // More gyrations
bool return_Q = P.identity; bool return_Q = P.identity;
bool return_P = Q.identity; bool return_P = Q.identity;
@ -487,6 +481,7 @@ ECP::Point AdditionFunction::operator()(const ECP::Point& P, const ECP::Point& Q
// This code taken from Double(P) for below // This code taken from Double(P) for below
identity = !!((double_P * (P.identity + (P.y == field.Identity()))) + identity); identity = !!((double_P * (P.identity + (P.y == field.Identity()))) + identity);
ECP::Point S = R;
if (double_P) if (double_P)
{ {
// This code taken from Double(P) // This code taken from Double(P)