Sending a Transaction with Encrypted Inputs

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.

Now that we have acquired our AES encryption key, we can use it to encrypt the arguments for calling the add function of our Counter.sol contract.

TypeScript (Server)

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 itValue = await wallet.encryptValue(
    123n,
    COUNTER_ADDRESS,
    counter.add.fragment.selector
)

await (
    await counter.add(itValue)
).wait()

TypeScript (Browser)

Python