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Update Poseidon Hash function names, rm HashBytes

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Since Poseidon Hash is used because of compatibility in zkSNARK circuits, due
circuit constraints number, the hash method of [T]*big.Int is the one directly
compatible with the circuits, is the method which have the `Hash` name on it.
The method that can take arbitrary length of []*big.Int putting them in chunks
of [T]*big.Int and iterating, is called `HashSlice`. The `HashBytes` has been
removed, as is a method that will not be used in zkSNARK circuits due high
constraints number.

For zkSNARK circuits, should be used `poseidon.Hash([poseidon.T]*big.Int)`.
This commit is contained in:
arnaucube
2020-07-23 07:59:59 +02:00
parent 2c471ab545
commit f22be3cdee
3 changed files with 41 additions and 53 deletions
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4
babyjub/eddsa.go
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@@ -231,7 +231,7 @@ func (k *PrivateKey) SignPoseidon(msg *big.Int) *Signature {
A := k.Public().Point()
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)
hm, err := poseidon.Hash(hmInput) // hm = H1(8*R.x, 8*R.y, A.x, A.y, msg)
if err != nil {
panic(err)
}
@@ -248,7 +248,7 @@ func (k *PrivateKey) SignPoseidon(msg *big.Int) *Signature {
// using blake-512 hash for buffer hashing and Poseidon for big.Int hashing.
func (p *PublicKey) VerifyPoseidon(msg *big.Int, sig *Signature) bool {
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)
hm, err := poseidon.Hash(hmInput) // hm = H1(8*R.x, 8*R.y, A.x, A.y, msg)
if err != nil {
panic(err)
}