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31 lines
1.0 KiB
31 lines
1.0 KiB
// SPDX-License-Identifier: MIT
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// OpenZeppelin Contracts (last updated v5.1.0) (utils/cryptography/Hashes.sol)
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pragma solidity ^0.8.20;
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/**
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* @dev Library of standard hash functions.
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*
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* _Available since v5.1._
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*/
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library Hashes {
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/**
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* @dev Commutative Keccak256 hash of a sorted pair of bytes32. Frequently used when working with merkle proofs.
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*
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* NOTE: Equivalent to the `standardNodeHash` in our https://github.com/OpenZeppelin/merkle-tree[JavaScript library].
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*/
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function commutativeKeccak256(bytes32 a, bytes32 b) internal pure returns (bytes32) {
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return a < b ? efficientKeccak256(a, b) : efficientKeccak256(b, a);
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}
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/**
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* @dev Implementation of keccak256(abi.encode(a, b)) that doesn't allocate or expand memory.
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*/
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function efficientKeccak256(bytes32 a, bytes32 b) internal pure returns (bytes32 value) {
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assembly ("memory-safe") {
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mstore(0x00, a)
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mstore(0x20, b)
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value := keccak256(0x00, 0x40)
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}
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}
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}
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