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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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18
circuits/transaction.circom
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@ -6,12 +6,12 @@ include "./keypair.circom"
Utxo structure: Utxo structure:
{ {
amount, amount,
blinding, // random number
pubkey, pubkey,
blinding, // random number
} }
commitment = hash(amount, blinding, pubKey) commitment = hash(amount, pubKey, blinding)
nullifier = hash(commitment, privKey, merklePath) nullifier = hash(commitment, merklePath, privKey)
*/ */
// Universal JoinSplit transaction with nIns inputs and 2 outputs // Universal JoinSplit transaction with nIns inputs and 2 outputs
@ -26,16 +26,16 @@ template Transaction(levels, nIns, nOuts, zeroLeaf) {
// data for transaction inputs // data for transaction inputs
signal input inputNullifier[nIns]; signal input inputNullifier[nIns];
signal private input inAmount[nIns]; signal private input inAmount[nIns];
signal private input inBlinding[nIns];
signal private input inPrivateKey[nIns]; signal private input inPrivateKey[nIns];
signal private input inBlinding[nIns];
signal private input inPathIndices[nIns]; signal private input inPathIndices[nIns];
signal private input inPathElements[nIns][levels]; signal private input inPathElements[nIns][levels];
// data for transaction outputs // data for transaction outputs
signal input outputCommitment[nOuts]; signal input outputCommitment[nOuts];
signal private input outAmount[nOuts]; signal private input outAmount[nOuts];
signal private input outBlinding[nOuts];
signal private input outPubkey[nOuts]; signal private input outPubkey[nOuts];
signal private input outBlinding[nOuts];
component inKeypair[nIns]; component inKeypair[nIns];
component inUtxoHasher[nIns]; component inUtxoHasher[nIns];
@ -51,8 +51,8 @@ template Transaction(levels, nIns, nOuts, zeroLeaf) {
inUtxoHasher[tx] = Poseidon(3); inUtxoHasher[tx] = Poseidon(3);
inUtxoHasher[tx].inputs[0] <== inAmount[tx]; inUtxoHasher[tx].inputs[0] <== inAmount[tx];
inUtxoHasher[tx].inputs[1] <== inBlinding[tx]; inUtxoHasher[tx].inputs[1] <== inKeypair[tx].publicKey;
inUtxoHasher[tx].inputs[2] <== inKeypair[tx].publicKey; inUtxoHasher[tx].inputs[2] <== inBlinding[tx];
nullifierHasher[tx] = Poseidon(3); nullifierHasher[tx] = Poseidon(3);
nullifierHasher[tx].inputs[0] <== inUtxoHasher[tx].out; nullifierHasher[tx].inputs[0] <== inUtxoHasher[tx].out;
@ -88,8 +88,8 @@ template Transaction(levels, nIns, nOuts, zeroLeaf) {
for (var tx = 0; tx < nOuts; tx++) { for (var tx = 0; tx < nOuts; tx++) {
outUtxoHasher[tx] = Poseidon(3); outUtxoHasher[tx] = Poseidon(3);
outUtxoHasher[tx].inputs[0] <== outAmount[tx]; outUtxoHasher[tx].inputs[0] <== outAmount[tx];
outUtxoHasher[tx].inputs[1] <== outBlinding[tx]; outUtxoHasher[tx].inputs[1] <== outPubkey[tx];
outUtxoHasher[tx].inputs[2] <== outPubkey[tx]; outUtxoHasher[tx].inputs[2] <== outBlinding[tx];
outUtxoHasher[tx].out === outputCommitment[tx]; outUtxoHasher[tx].out === outputCommitment[tx];
// Check that amount fits into 248 bits to prevent overflow // Check that amount fits into 248 bits to prevent overflow

8
src/utxo.js
View File

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