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Merge pull request #13 from iden3/feature/update-bbjj-sig

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Update BabyJubJub signature with Poseidon
This commit is contained in:
Eduard S
2020-03-03 17:57:27 +01:00
committed by GitHub
parent 937500b203 97c76ce614
commit 5d88f7c4cd
2 changed files with 6 additions and 6 deletions
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8
babyjub/eddsa.go
View File

@@ -222,8 +222,8 @@ func (k *PrivateKey) SignPoseidon(msg *big.Int) *Signature {
r.Mod(r, SubOrder)
R8 := NewPoint().Mul(r, B8) // R8 = r * 8 * B
A := k.Public().Point()
hmInput := []*big.Int{R8.X, R8.Y, A.X, A.Y, msg}
hm, err := poseidon.Hash(hmInput) // hm = H1(8*R.x, 8*R.y, A.x, A.y, msg)
hmInput := [poseidon.T]*big.Int{R8.X, R8.Y, A.X, A.Y, msg, big.NewInt(int64(0))}
hm, err := poseidon.PoseidonHash(hmInput) // hm = H1(8*R.x, 8*R.y, A.x, A.y, msg)
if err != nil {
panic(err)
}
@@ -238,8 +238,8 @@ func (k *PrivateKey) SignPoseidon(msg *big.Int) *Signature {
// VerifyPoseidon verifies the signature of a message encoded as a big.Int in Zq
// using blake-512 hash for buffer hashing and Poseidon for big.Int hashing.
func (p *PublicKey) VerifyPoseidon(msg *big.Int, sig *Signature) bool {
hmInput := []*big.Int{sig.R8.X, sig.R8.Y, p.X, p.Y, msg}
hm, err := poseidon.Hash(hmInput) // hm = H1(8*R.x, 8*R.y, A.x, A.y, msg)
hmInput := [poseidon.T]*big.Int{sig.R8.X, sig.R8.Y, p.X, p.Y, msg, big.NewInt(int64(0))}
hm, err := poseidon.PoseidonHash(hmInput) // hm = H1(8*R.x, 8*R.y, A.x, A.y, msg)
if err != nil {
panic(err)
}

4
babyjub/eddsa_test.go
View File

@@ -104,7 +104,7 @@ func TestSignVerifyPoseidon(t *testing.T) {
"15383486972088797283337779941324724402501462225528836549661220478783371668959",
sig.R8.Y.String())
assert.Equal(t,
"707916534780195227251279867700047344876009454172122484896943904789217159950",
"248298168863866362217836334079793350221620631973732197668910946177382043688",
sig.S.String())
ok := pk.VerifyPoseidon(msg, sig)
@@ -116,7 +116,7 @@ func TestSignVerifyPoseidon(t *testing.T) {
assert.Equal(t, ""+
"dfedb4315d3f2eb4de2d3c510d7a987dcab67089c8ace06308827bf5bcbe02a2"+
"0e2b947dfc400d2e9c78b5b625fd36dee8dbcfddc9a0baa6514f59a6a3aa9001",
"28506bce274aa1b3f7e7c2fd7e4fe09bff8f9aa37a42def7994e98f322888c00",
hex.EncodeToString(sigBuf[:]))
ok = pk.VerifyPoseidon(msg, sig2)