utils/curve25519.sage: Remove redundant coercion to field k.

diff --git a/utils/curve25519.sage b/utils/curve25519.sage
index f5375a79bcb894bd26843ef3afd6a75b06dfb875..6fa3cd342e3cddc07578c9b8ab240d8118b3ba2c 100644 (file)
--- a/utils/curve25519.sage
+++ b/utils/curve25519.sage
@@ -267,7 +267,7 @@ assert x25519(x, Y[0]) == x25519(y, X[0]) == Z[0]
 ### Edwards curve parameters and conversion.
 
 a = k(-1)
-d = k(-A0/(A0 + 1))
+d = -A0/(A0 + 1)
 
 def mont_to_ed(u, v):
   return sqrt(-A - 2)*u/v, (u - 1)/(u + 1)