Commit b6c44563 authored by Niels Möller's avatar Niels Möller

Fixed equations for Montgomery->Edwards transformation.

parent 131d068d
......@@ -127,7 +127,7 @@ mapping $P = (x,y)$ to $P' = (u, v)$, as follows.
that $x^2 + bx + 1 = 0$, or $(x + b/2)^2 = (b/2)^2 - 1$, which also
isn't a quadratic residue). The correspondence is then given by
\begin{align*}
u &= \sqrt{b} \, x / y \\
u &= \sqrt{b+2} \, x / y \\
v &= (x-1) / (x+1)
\end{align*}
\end{itemize}
......@@ -135,7 +135,7 @@ mapping $P = (x,y)$ to $P' = (u, v)$, as follows.
The inverse transformation is
\begin{align*}
x &= (1+v) / (1-v) \\
y &= \sqrt{b} x / u
y &= \sqrt{b+2} x / u
\end{align*}
If the Edwards coordinates are represented using homogeneous
coordinates, $u = U/W$ and $v = V/W$, then
......
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