Encrypt multiple values

This example demonstrates the FHE encryption mechanism with multiple values.

To run this example correctly, make sure the files are placed in the following directories:

• .sol file → <your-project-root-dir>/contracts/

• .ts file → <your-project-root-dir>/test/

This ensures Hardhat can compile and test your contracts as expected.

EncryptMultipleValues.sol

// SPDX-License-Identifier: BSD-3-Clause-Clear
pragma solidity ^0.8.24;

import {
  FHE,
  externalEbool,
  externalEuint32,
  externalEaddress,
  ebool,
  euint32,
  eaddress
} from "@fhevm/solidity/lib/FHE.sol";
import { EthereumConfig } from "@fhevm/solidity/config/ZamaConfig.sol";

/**
 * This trivial example demonstrates the FHE encryption mechanism.
 */
contract EncryptMultipleValues is EthereumConfig {
  ebool private _encryptedEbool;
  euint32 private _encryptedEuint32;
  eaddress private _encryptedEaddress;

  // solhint-disable-next-line no-empty-blocks
  constructor() {}

  function initialize(
    externalEbool inputEbool,
    externalEuint32 inputEuint32,
    externalEaddress inputEaddress,
    bytes calldata inputProof
  ) external {
    _encryptedEbool = FHE.fromExternal(inputEbool, inputProof);
    _encryptedEuint32 = FHE.fromExternal(inputEuint32, inputProof);
    _encryptedEaddress = FHE.fromExternal(inputEaddress, inputProof);

    // For each of the 3 values:
    // Grant FHE permission to both the contract itself (`address(this)`) and the caller (`msg.sender`),
    // to allow future decryption by the caller (`msg.sender`).

    FHE.allowThis(_encryptedEbool);
    FHE.allow(_encryptedEbool, msg.sender);

    FHE.allowThis(_encryptedEuint32);
    FHE.allow(_encryptedEuint32, msg.sender);

    FHE.allowThis(_encryptedEaddress);
    FHE.allow(_encryptedEaddress, msg.sender);
  }

  function encryptedBool() public view returns (ebool) {
    return _encryptedEbool;
  }

  function encryptedUint32() public view returns (euint32) {
    return _encryptedEuint32;
  }

  function encryptedAddress() public view returns (eaddress) {
    return _encryptedEaddress;
  }
}

EncryptMultipleValues.ts