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pull/877/head
Jeffrey Walton 2019-08-07 23:30:48 -04:00
parent c4700ae0b9
commit 242df465e8
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1 changed files with 2 additions and 1 deletions
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ecp.cpp
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@ -896,6 +896,7 @@ ECP::Point ECP::AdditionFunction::operator()(const Point& P, const Point& Q) con
bool double_P = field.Equal(P.x, Q.x) && field.Equal(P.y, Q.y); bool double_P = field.Equal(P.x, Q.x) && field.Equal(P.y, Q.y);
bool identity = field.Equal(P.x, Q.x) && !field.Equal(P.y, Q.y); bool identity = field.Equal(P.x, Q.x) && !field.Equal(P.y, Q.y);
// This code taken from Double(P) for below
identity = static_cast<bool>((double_P * (P.identity + (P.y == field.Identity()))) + identity); identity = static_cast<bool>((double_P * (P.identity + (P.y == field.Identity()))) + identity);
if (double_P) if (double_P)
@ -910,7 +911,7 @@ ECP::Point ECP::AdditionFunction::operator()(const Point& P, const Point& Q) con
} }
else else
{ {
// Original Double (P,Q) code // Original Add(P,Q) code
FieldElement t = field.Subtract(Q.y, P.y); FieldElement t = field.Subtract(Q.y, P.y);
t = field.Divide(t, field.Subtract(Q.x, P.x)); t = field.Divide(t, field.Subtract(Q.x, P.x));
FieldElement x = field.Subtract(field.Subtract(field.Square(t), P.x), Q.x); FieldElement x = field.Subtract(field.Subtract(field.Square(t), P.x), Q.x);