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ristretto255
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ristretto255: add a test from the new version of the I-D

This commit is contained in:
Filippo Valsorda 2020-03-30 01:38:15 -04:00
parent 502122d125
commit dafb47ee6f
1 changed files with 33 additions and 5 deletions
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38
ristretto255_test.go
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@ -49,11 +49,12 @@ func TestSqrtRatioM1(t *testing.T) {
assertFeEqual(new(radix51.FieldElement).Mul(new(radix51.FieldElement).Square(invSqrt4), four), one)
var tests = []sqrtRatioTest{
{u: zero, v: zero, sqrt: zero, choice: 1, negative: 0}, // 0
{u: one, v: zero, sqrt: zero, choice: 0, negative: 0}, // 1
{u: two, v: one, sqrt: sqrt2i, choice: 0, negative: 0}, // 2
{u: four, v: one, sqrt: two, choice: 1, negative: 0}, // 3
{u: one, v: four, sqrt: invSqrt4, choice: 1, negative: 0}, // 4
{u: zero, v: zero, sqrt: zero, choice: 1, negative: 0},
{u: zero, v: one, sqrt: zero, choice: 1, negative: 0},
{u: one, v: zero, sqrt: zero, choice: 0, negative: 0},
{u: two, v: one, sqrt: sqrt2i, choice: 0, negative: 0},
{u: four, v: one, sqrt: two, choice: 1, negative: 0},
{u: one, v: four, sqrt: invSqrt4, choice: 1, negative: 0},
}
for idx, tt := range tests {
@ -242,6 +243,33 @@ func TestRistrettoFromUniformBytesTestVectors(t *testing.T) {
}
}
func TestEquivalentFromUniformBytes(t *testing.T) {
inputs := []string{
"edffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff" +
"1200000000000000000000000000000000000000000000000000000000000000",
"edffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff7f" +
"ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
"0000000000000000000000000000000000000000000000000000000000000080" +
"ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff7f",
"0000000000000000000000000000000000000000000000000000000000000000" +
"1200000000000000000000000000000000000000000000000000000000000080",
}
expected := "304282791023b73128d277bdcb5c7746ef2eac08dde9f2983379cb8e5ef0517f"
var element Element
for i, input := range inputs {
h, err := hex.DecodeString(input)
if err != nil {
t.Fatalf("#%d: bad hex encoding in test vector: %v", i, err)
}
element.FromUniformBytes(h[:])
if encoding := hex.EncodeToString(element.Encode(nil)); encoding != expected {
t.Errorf("#%d: expected %q, got %q", i, expected, encoding)
}
}
}
func TestMarshalScalar(t *testing.T) {
x := new(Scalar)
// generate an arbitrary scalar