Writing Encrypted Data to Contract

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.28;

import '@fhenixprotocol/cofhe-contracts/FHE.sol';

contract EncryptedCounter {
  euint32 public count;

  function setCount(externalEuint32 inCount, bytes calldata inputProof) external {
    count = FHE.asEuint32(inCount, inputProof);
    FHE.allowThis(count);
    FHE.allowSender(count);
  }
}

import { Encryptable } from '@cofhe/sdk';
import { parseAbi } from 'viem';
import { sepolia } from 'viem/chains';

// externalEuint32 is a bytes32 value type on the wire
const encryptedCounterAbi = parseAbi([
  'function setCount(bytes32 inCount, bytes inputProof)',
]);

// 1) Encrypt right before sending the transaction
const [countHash, signature] = await cofheClient
  .encryptInputs([Encryptable.uint32(42n)])
  .setConsumingContract(encryptedCounterAddress)
  .execute();

// 2) Pass the handle and its proof
const hash = await walletClient.writeContract({
  chain: sepolia,
  account,
  address: encryptedCounterAddress,
  abi: encryptedCounterAbi,
  functionName: 'setCount',
  args: [countHash, signature],
});

await publicClient.waitForTransactionReceipt({ hash });

import { Encryptable } from '@cofhe/sdk';

// 1) Encrypt
const [countHash, signature] = await cofheClient
  .encryptInputs([Encryptable.uint32(42n)])
  .setConsumingContract(encryptedCounterAddress)
  .execute();

// 2) Send the transaction
const tx = await contract.setCount(countHash, signature);
await tx.wait();