arnaucube/go-blindsecp256k1
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Signature.S mod N

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arnaucube
2021-02-01 19:22:21 +01:00
parent 40de297340
commit d09769d510
3 changed files with 22 additions and 0 deletions
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1
blindsecp256k1.go
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@@ -157,6 +157,7 @@ func Unblind(sBlind, m *big.Int, u *UserSecretData) *Signature {
// s = a s' + b
as := new(big.Int).Mul(u.A, sBlind)
s := new(big.Int).Add(as, u.B)
s = new(big.Int).Mod(s, N)
return &Signature{
S: s,

4
blindsecp256k1_test.go
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@@ -25,6 +25,10 @@ func TestFlow(t *testing.T) {
// user: unblinds the blinded signature
sig := Unblind(sBlind, msg, userSecretData)
sigB := sig.Bytes()
sig2, err := NewSignatureFromBytes(sigB)
assert.Nil(t, err)
assert.Equal(t, sig, sig2)
// signature can be verified with signer PublicKey
verified := Verify(msg, sig, signerPubK)

17
parsers_test.go
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@@ -92,6 +92,23 @@ func TestBytes(t *testing.T) {
sig2, err := NewSignatureFromBytes(b)
assert.Nil(t, err)
assert.Equal(t, &sig, sig2)
// Signature with bigger values
s, ok := new(big.Int).SetString("43744879514016998261043792362491545206150700367692876136431010903034023684055", 10) //nolint:lll
require.True(t, ok)
x, ok := new(big.Int).SetString("56183217574518331862027285308947626162625485037257226169003339923450551228164", 10) //nolint:lll
require.True(t, ok)
y, ok := new(big.Int).SetString("62825693913681695979055350889339417157462875026935818721506450621762231021976", 10) //nolint:lll
require.True(t, ok)
sig = Signature{
S: s,
F: &Point{X: x, Y: y},
}
b = sig.Bytes()
assert.Equal(t, "d7a75050259cc06415f19bde5460a58325e3050806ba949d9ac9728b71b9b6600457ba001981781ed31acafed3d1e82c2ad53d08e3f293eab2f199ed0193367c98311f1894598c91f10fe415ba4a6d04e1351d07430631c7decdbbdb2615e68a", hex.EncodeToString(b)) //nolint:lll
sig2, err = NewSignatureFromBytes(b)
assert.Nil(t, err)
assert.Equal(t, &sig, sig2)
}
func TestImportECDSApubKey(t *testing.T) {