Coordinates conversion from/to twisted Edwards to Weierstass form

[gogost.git] / src / cypherpunks.ru / gogost / gost3410 / 2012_test.go

diff --git a/src/cypherpunks.ru/gogost/gost3410/2012_test.go b/src/cypherpunks.ru/gogost/gost3410/2012_test.go
index 2ff03455ff1c0939294b086d0d84258cb06dd5b2..ddfd6ad240c38ed64921aa3170ebcb3abd4ee7ab 100644 (file)
--- a/src/cypherpunks.ru/gogost/gost3410/2012_test.go
+++ b/src/cypherpunks.ru/gogost/gost3410/2012_test.go
@@ -150,6 +150,8 @@ func TestGCL3Vectors(t *testing.T) {
                bytes2big(b),
                bytes2big(x),
                bytes2big(y),
+               nil,
+               nil,
        )
        if err != nil {
                t.FailNow()
@@ -379,6 +381,31 @@ func TestSESPAKE(t *testing.T) {
                }
        }
 }
+
+// Twisted Edwards to Weierstrass coordinates conversion and vice versa
+func TestUVXYConversion(t *testing.T) {
+       f := func(c *Curve, uRaw, vRaw []byte) {
+               u := bytes2big(uRaw)
+               v := bytes2big(vRaw)
+               x, y := UV2XY(c, u, v)
+               if x.Cmp(c.X) != 0 {
+                       t.FailNow()
+               }
+               if y.Cmp(c.Y) != 0 {
+                       t.FailNow()
+               }
+               uGot, vGot := XY2UV(c, c.X, c.Y)
+               if u.Cmp(uGot) != 0 {
+                       t.FailNow()
+               }
+               if v.Cmp(vGot) != 0 {
+                       t.FailNow()
+               }
+       }
+       raw, _ := hex.DecodeString("60CA1E32AA475B348488C38FAB07649CE7EF8DBE87F22E81F92B2592DBA300E7")
+       f(CurveIdtc26gost34102012256paramSetA(), []byte{0x0D}, raw)
+       raw, _ = hex.DecodeString("469AF79D1FB1F5E16B99592B77A01E2A0FDFB0D01794368D9A56117F7B38669522DD4B650CF789EEBF068C5D139732F0905622C04B2BAAE7600303EE73001A3D")
+       f(CurveIdtc26gost34102012512paramSetC(), []byte{0x12}, raw)
 }
 
 func BenchmarkSign2012(b *testing.B) {