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ERC721 with Encryption Key
An NFT that contains 4 encrypted 32-bit integers, which represent a 128 bit encryption key. An app can use this key to encrypt data from an external URL, representing a picture, movie or any data that should be only accessed by the holder of the NFT.
// SPDX-License-Identifier: BSD-3-Clause-Clear
pragma solidity >=0.8.13 <0.9.0;
import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v4.9.0/contracts/token/ERC721/ERC721.sol";
import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v4.9.0/contracts/token/ERC721/extensions/ERC721Royalty.sol";
import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v4.9.0/contracts/token/ERC721/extensions/ERC721Burnable.sol";
import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v4.9.0/contracts/token/ERC721/extensions/ERC721Enumerable.sol";
import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v4.9.0/contracts/access/AccessControlEnumerable.sol";
import "fhevm/lib/TFHE.sol";
contract SecretNft is
ERC721
{
string private _baseTokenURI;
mapping(uint => euint32[4]) internal keys;
constructor(
string memory name,
string memory symbol,
string memory baseTokenURI
) ERC721(name, symbol) {
_baseTokenURI = baseTokenURI;
}
function _baseURI()
internal
view
virtual
override(ERC721)
returns (string memory)
{
return _baseTokenURI;
}
function supportsInterface(bytes4 interfaceId)
public
view
override(ERC721)
returns (bool)
{
return super.supportsInterface(interfaceId);
}
function mintNft(address to, uint tokenId, bytes calldata k1, bytes calldata k2, bytes calldata k3, bytes calldata k4)
external
returns (uint256) {
keys[tokenId] = [TFHE.asEuint32(k1), TFHE.asEuint32(k2), TFHE.asEuint32(k3), TFHE.asEuint32(k4)];
_mint(to, tokenId);
return tokenId;
}
function getKey(uint tokenId, bytes32 publicKey) public view returns (bytes[4] memory) {
return [TFHE.reencrypt(keys[tokenId][0], publicKey), TFHE.reencrypt(keys[tokenId][1], publicKey), TFHE.reencrypt(keys[tokenId][2], publicKey), TFHE.reencrypt(keys[tokenId][3], publicKey)];
}
}
Last modified 4mo ago