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ristretto255: add basepoint test for Decode

This commit is contained in:
George Tankersley 2019-03-24 21:10:39 +00:00 committed by Filippo Valsorda
parent e3f2dac2eb
commit 43dee3dc5c
1 changed files with 21 additions and 2 deletions
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23
ristretto255_test.go
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@ -1,8 +1,10 @@
package ristretto255
import (
"encoding/hex"
"testing"
"github.com/gtank/ristretto255/internal/group"
"github.com/gtank/ristretto255/internal/radix51"
)
@ -63,9 +65,26 @@ func TestSqrtRatioM1(t *testing.T) {
}
func TestRistrettoBasepointDecode(t *testing.T) {
extendedBasepoint := &Element{}
err := extendedBasepoint.Decode(encodedBasepoint)
var (
// The encoding of Ristretto element that can be represented internally by the Curve25519 base point.
compressedRistrettoBasepoint, _ = hex.DecodeString("e2f2ae0a6abc4e71a884a961c500515f58e30b6aa582dd8db6a65945e08d2d76")
// The representative Ristretto basepoint in extended coordinates.
ristrettoBasepoint = Element{r: group.ExtendedGroupElement{
X: radix51.FieldElement([5]uint64{426475514619346, 2063872706840040, 14628272888959, 107677749330612, 288339085807592}),
Y: radix51.FieldElement([5]uint64{1934594822876571, 2049809580636559, 1991994783322914, 1758681962032007, 380046701118659}),
Z: radix51.FieldElement([5]uint64{1, 0, 0, 0, 0}),
T: radix51.FieldElement([5]uint64{410445769351754, 2235400917701188, 1495825632738689, 1351628537510093, 430502003771208}),
}}
)
decodedBasepoint := &Element{}
err := decodedBasepoint.Decode(compressedRistrettoBasepoint)
if err != nil {
t.Fatal(err)
}
if decodedBasepoint.Equal(&ristrettoBasepoint) != 1 {
t.Error("decode succeeded, but got wrong point")
}
}