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SolidityとJavaScript(Web3.js)で同様の文字列ハッシュ化(Keccak256)を行う方法

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文字列ハッシュ化の手順

  1. utf-8表現(string型)からHex表現(bytes型)に変換
  2. Hex化した文字列をKeccak256変換

Solidityの場合

string message = "sample message";
bytes hexMessage = bytes(message); // 1
bytes32 hashedMessage = keccak256(hexMessage) // 2

JavaScript (Web3.js) の場合

let message = 'sample message';
let hexMessage = web3.utils.utf8ToHex(message); // 1
let hashedMessage = web3.utils.soliditySha3(hexMessage); // 2
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