mirror of
https://github.com/luxfhe/example-dapps.git
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zeekayandHanzo Dev
a8c164c427
A rebrand renamed third-party names it did not own. @luxfhe-fhe/relayer-sdk and @luxfhe-fhe/oracle-solidity were never published, and @fhevm/solidity ships config/ZamaConfig.sol, not LuxConfig.sol, so nothing installed and no contract compiled. The overrides now say what the lockfile already resolved (@zama-fhe/relayer-sdk ^0.3.0-8, @zama-fhe/oracle-solidity ^0.2.0), and the relayer bundle loads from cdn.zama.org, the host that serves it. Co-authored-by: Hanzo Dev <[email protected]>
53 lines
2.2 KiB
Solidity
53 lines
2.2 KiB
Solidity
// SPDX-License-Identifier: BSD-3-Clause-Clear
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pragma solidity ^0.8.24;
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import {FHE, euint32} from "@fhevm/solidity/lib/FHE.sol";
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import {ZamaEthereumConfig} from "@fhevm/solidity/config/ZamaConfig.sol";
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/**
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* This trivial example demonstrates the FHE decryption mechanism
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* and highlights common pitfalls developers may encounter.
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*/
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contract UserDecryptSingleValue is ZamaEthereumConfig {
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euint32 private _trivialEuint32;
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// solhint-disable-next-line no-empty-blocks
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constructor() {}
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function initializeUint32(uint32 value) external {
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// Compute a trivial FHE formula _trivialEuint32 = value + 1
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_trivialEuint32 = FHE.add(FHE.asEuint32(value), FHE.asEuint32(1));
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// Grant FHE permissions to:
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// ✅ The contract caller (`msg.sender`): allows them to decrypt `_trivialEuint32`.
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// ✅ The contract itself (`address(this)`): allows it to operate on `_trivialEuint32` and
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// also enables the caller to perform user decryption.
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//
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// Note: If you forget to call `FHE.allowThis(_trivialEuint32)`, the user will NOT be able
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// to user decrypt the value! Both the contract and the caller must have FHE permissions
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// for user decryption to succeed.
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FHE.allowThis(_trivialEuint32);
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FHE.allow(_trivialEuint32, msg.sender);
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}
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function initializeUint32Wrong(uint32 value) external {
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// Compute a trivial FHE formula _trivialEuint32 = value + 1
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_trivialEuint32 = FHE.add(FHE.asEuint32(value), FHE.asEuint32(1));
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// ❌ Common FHE permission mistake:
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// ================================================================
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// We grant FHE permissions to the contract caller (`msg.sender`),
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// expecting they will be able to user decrypt the encrypted value later.
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//
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// However, this will fail! 💥
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// The contract itself (`address(this)`) also needs FHE permissions to allow user decryption.
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// Without granting the contract access using `FHE.allowThis(...)`,
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// the user decryption attempt by the user will not succeed.
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FHE.allow(_trivialEuint32, msg.sender);
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}
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function encryptedUint32() public view returns (euint32) {
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return _trivialEuint32;
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}
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}
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