40 lines
1.2 KiB
Solidity
40 lines
1.2 KiB
Solidity
// SPDX-License-Identifier: MIT
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pragma solidity ^0.8.19;
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/*
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* @dev Solidity implementation of the ENS namehash algorithm.
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*
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* Warning! Does not normalize or validate names before hashing.
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*/
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library ENSNamehash {
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function namehash(bytes memory domain) internal pure returns (bytes32) {
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return namehash(domain, 0);
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}
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function namehash(bytes memory domain, uint256 i) internal pure returns (bytes32) {
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if (domain.length <= i) {
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return 0x0000000000000000000000000000000000000000000000000000000000000000;
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}
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uint256 len = LabelLength(domain, i);
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return keccak256(abi.encodePacked(namehash(domain, i + len + 1), keccak(domain, i, len)));
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}
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function LabelLength(bytes memory domain, uint256 i) private pure returns (uint256) {
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uint256 len;
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while (i + len != domain.length && domain[i + len] != 0x2e) {
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len++;
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}
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return len;
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}
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function keccak(bytes memory data, uint256 offset, uint256 len) private pure returns (bytes32 ret) {
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require(offset + len <= data.length);
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assembly {
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ret := keccak256(add(add(data, 32), offset), len)
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}
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}
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}
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