Resolving a Transaction's Encrypted Outputs
This guide assumes you have already deployed the Counter.sol contract. If you haven't already, check out our guide for deploying a Basic Private Smart Contract.
After calling add
, we can use our AES encryption key to decrypt the value of sum
and check the result.
Setup
npm install @coti-io/coti-ethers
Code
import { Contract, CotiNetwork, getDefaultProvider, Wallet } from "@coti-io/coti-ethers"
const PRIVATE_KEY = "<EOA_PRIVATE_KEY>"
const AES_KEY = "<AES_KEY>"
const COUNTER_ADDRESS = "<COUNTER_ADDRESS>"
const COUNTER_ABI = [
{
"inputs": [],
"stateMutability": "nonpayable",
"type": "constructor"
},
{
"inputs": [
{
"components": [
{
"internalType": "ctUint64",
"name": "ciphertext",
"type": "uint256"
},
{
"internalType": "bytes",
"name": "signature",
"type": "bytes"
}
],
"internalType": "struct itUint64",
"name": "value",
"type": "tuple"
}
],
"name": "add",
"outputs": [],
"stateMutability": "nonpayable",
"type": "function"
},
{
"inputs": [],
"name": "sum",
"outputs": [
{
"internalType": "ctUint64",
"name": "",
"type": "uint256"
}
],
"stateMutability": "view",
"type": "function"
}
]
const provider = getDefaultProvider(CotiNetwork.Testnet)
const wallet = new Wallet(PRIVATE_KEY, provider)
wallet.setAesKey(AES_KEY)
const counter = new Contract(COUNTER_ADDRESS, COUNTER_ABI, wallet)
const ctSum = await counter.sum()
const clearSum = await wallet.decryptValue(ctSum)
console.log(clearSum)
Setup
npm install @coti-io/coti-ethers
Code
import { Contract, CotiNetwork, getDefaultProvider, Wallet } from "@coti-io/coti-ethers"
const PRIVATE_KEY = "<EOA_PRIVATE_KEY>"
const AES_KEY = "<AES_KEY>"
const COUNTER_ADDRESS = "<COUNTER_ADDRESS>"
const COUNTER_ABI = [
{
"inputs": [],
"stateMutability": "nonpayable",
"type": "constructor"
},
{
"inputs": [
{
"components": [
{
"internalType": "ctUint64",
"name": "ciphertext",
"type": "uint256"
},
{
"internalType": "bytes",
"name": "signature",
"type": "bytes"
}
],
"internalType": "struct itUint64",
"name": "value",
"type": "tuple"
}
],
"name": "add",
"outputs": [],
"stateMutability": "nonpayable",
"type": "function"
},
{
"inputs": [],
"name": "sum",
"outputs": [
{
"internalType": "ctUint64",
"name": "",
"type": "uint256"
}
],
"stateMutability": "view",
"type": "function"
}
]
const provider = new BrowserProvider(window.ethereum as Eip1193Provider)
const signer = await provider.getSigner()
signer.setAesKey(AES_KEY)
const counter = new Contract(COUNTER_ADDRESS, COUNTER_ABI, signer)
const ctSum = await counter.sum()
const clearSum = await signer.decryptValue(ctSum)
console.log(clearSum)
Setup
pip install coti-web3
Code
from eth_account import Account
from eth_account.signers.local import LocalAccount
from web3 import Web3
from web3.utils.coti import (
CotiNetwork,
init_web3
)
PRIVATE_KEY = "<EOA_PRIVATE_KEY>"
AES_KEY = "<AES_KEY>"
COUNTER_ADDRESS = "<COUNTER_ADDRESS>"
COUNTER_ABI = [
{
"inputs": [],
"stateMutability": "nonpayable",
"type": "constructor"
},
{
"inputs": [
{
"components": [
{
"internalType": "ctUint64",
"name": "ciphertext",
"type": "uint256"
},
{
"internalType": "bytes",
"name": "signature",
"type": "bytes"
}
],
"internalType": "struct itUint64",
"name": "value",
"type": "tuple"
}
],
"name": "add",
"outputs": [],
"stateMutability": "nonpayable",
"type": "function"
},
{
"inputs": [],
"name": "sum",
"outputs": [
{
"internalType": "ctUint64",
"name": "",
"type": "uint256"
}
],
"stateMutability": "view",
"type": "function"
}
]
account: LocalAccount = Account.from_key(PRIVATE_KEY, { 'aes_key': AES_KEY })
w3: Web3 = init_web3(CotiNetwork.TESTNET)
counter_contract = w3.eth.contract(address=COUNTER_ADDRESS, abi=COUNTER_ABI)
ct_sum = counter_contract.functions.sum().call({'from': account.address})
clear_sum = account.decrypt_value(ct_sum)
print(clear_sum)
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