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reorder blinding, pubkey, amount

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poma 2021-10-30 20:14:47 +01:00
parent 9d4f8801ea
commit 397942f94d
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GPG Key ID: BA20CB01FE165657
2 changed files with 15 additions and 15 deletions
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22
circuits/transaction.circom
View File

@ -6,12 +6,12 @@ include "./keypair.circom"
Utxo structure:
{
amount,
blinding, // random number
pubkey,
blinding, // random number
}
commitment = hash(amount, blinding, pubKey)
nullifier = hash(commitment, privKey, merklePath)
commitment = hash(amount, pubKey, blinding)
nullifier = hash(commitment, merklePath, privKey)
*/
// Universal JoinSplit transaction with nIns inputs and 2 outputs
@ -26,16 +26,16 @@ template Transaction(levels, nIns, nOuts, zeroLeaf) {
// data for transaction inputs
signal input inputNullifier[nIns];
signal private input inAmount[nIns];
signal private input inBlinding[nIns];
signal private input inPrivateKey[nIns];
signal private input inBlinding[nIns];
signal private input inPathIndices[nIns];
signal private input inPathElements[nIns][levels];
// data for transaction outputs
signal input outputCommitment[nOuts];
signal private input outAmount[nOuts];
signal private input outBlinding[nOuts];
signal private input outPubkey[nOuts];
signal private input outBlinding[nOuts];
component inKeypair[nIns];
component inUtxoHasher[nIns];
@ -51,8 +51,8 @@ template Transaction(levels, nIns, nOuts, zeroLeaf) {
inUtxoHasher[tx] = Poseidon(3);
inUtxoHasher[tx].inputs[0] <== inAmount[tx];
inUtxoHasher[tx].inputs[1] <== inBlinding[tx];
inUtxoHasher[tx].inputs[2] <== inKeypair[tx].publicKey;
inUtxoHasher[tx].inputs[1] <== inKeypair[tx].publicKey;
inUtxoHasher[tx].inputs[2] <== inBlinding[tx];
nullifierHasher[tx] = Poseidon(3);
nullifierHasher[tx].inputs[0] <== inUtxoHasher[tx].out;
@ -73,8 +73,8 @@ template Transaction(levels, nIns, nOuts, zeroLeaf) {
checkRoot[tx].in[1] <== tree[tx].root;
checkRoot[tx].enabled <== inAmount[tx];
// We don't need to range check input amounts, since all inputs are valid UTXOs that
// were already checked as outputs in the previous transaction (or zero amount UTXOs that don't
// We don't need to range check input amounts, since all inputs are valid UTXOs that
// were already checked as outputs in the previous transaction (or zero amount UTXOs that don't
// need to be checked either).
sumIns += inAmount[tx];
@ -88,8 +88,8 @@ template Transaction(levels, nIns, nOuts, zeroLeaf) {
for (var tx = 0; tx < nOuts; tx++) {
outUtxoHasher[tx] = Poseidon(3);
outUtxoHasher[tx].inputs[0] <== outAmount[tx];
outUtxoHasher[tx].inputs[1] <== outBlinding[tx];
outUtxoHasher[tx].inputs[2] <== outPubkey[tx];
outUtxoHasher[tx].inputs[1] <== outPubkey[tx];
outUtxoHasher[tx].inputs[2] <== outBlinding[tx];
outUtxoHasher[tx].out === outputCommitment[tx];
// Check that amount fits into 248 bits to prevent overflow

8
src/utxo.js
View File

@ -25,7 +25,7 @@ class Utxo {
*/
getCommitment() {
if (!this._commitment) {
this._commitment = poseidonHash([this.amount, this.blinding, this.keypair.pubkey])
this._commitment = poseidonHash([this.amount, this.keypair.pubkey, this.blinding])
}
return this._commitment
}
@ -57,7 +57,7 @@ class Utxo {
* @returns {string} `0x`-prefixed hex string with data
*/
encrypt() {
const bytes = Buffer.concat([toBuffer(this.blinding, 31), toBuffer(this.amount, 31)])
const bytes = Buffer.concat([toBuffer(this.amount, 31), toBuffer(this.blinding, 31)])
return this.keypair.encrypt(bytes)
}
@ -72,8 +72,8 @@ class Utxo {
static decrypt(keypair, data, index) {
const buf = keypair.decrypt(data)
return new Utxo({
blinding: BigNumber.from('0x' + buf.slice(0, 31).toString('hex')),
amount: BigNumber.from('0x' + buf.slice(31, 62).toString('hex')),
amount: BigNumber.from('0x' + buf.slice(0, 31).toString('hex')),
blinding: BigNumber.from('0x' + buf.slice(31, 62).toString('hex')),
keypair,
index,
})