nodejs-keccak256
Prevent Ethereum hashing bugs in JavaScript and TypeScript. Node's sha3-256 is NIST SHA3, not Ethereum Keccak-256, and silently breaks selectors, signatures, storage slots, and address derivation. Use when hashing for Ethereum in JavaScript or TypeScript, or when a selector, signature, storage slot, or derived address is wrong.
DeepseekModel
キュレーション済みスキル
品質 優秀 · 90
v1.0.0
取得
https://deepseekmodel.com/api/download.php?id=affaan-m-ecc-skills-nodejs-keccak256-skill-md&format=skill
ダウンロード .skill
標準形式。system_prompt と model_config を収録し、任意の Agent で利用可能
.skill ファイルの system_prompt フィールドの実際の内容。
name nodejs-keccak256 description Prevent Ethereum hashing bugs in JavaScript and TypeScript. Node's sha3-256 is NIST SHA3, not Ethereum Keccak-256, and silently breaks selectors, signatures, storage slots, and address derivation. Use when hashing for Ethereum in JavaScript or TypeScript, or when a selector, signature, storage slot, or derived address is wrong. metadata {"version":"1.0.0","origin":"ECC direct-port adaptation"} Node.js Keccak-256 Ethereum uses Keccak-256, not the NIST-standardized SHA3 variant exposed by Node's crypto.createHash('sha3-256') . When to Use Computing Ethereum function selectors or event topics Building EIP-712, signature, Merkle, or storage-slot helpers in JS/TS Reviewing any code that hashes Ethereum data with Node crypto directly How It Works The two algorithms produce different outputs for the same input, and Node will not warn you. import crypto from 'crypto' ; import { keccak256, toUtf8Bytes } from 'ethers' ; const data = 'hello' ; const nistSha3 = crypto. createHash ( 'sha3-256' ). update (data). digest ( 'hex' ); const keccak = keccak256 ( toUtf8Bytes (data)). slice ( 2 ); console . log (nistSha3 === keccak); // false Examples ethers v6 import { keccak256, toUtf8Bytes, solidityPackedKeccak256, id } from 'ethers' ; const hash = keccak256 ( new Uint8Array ([ 0x01 , 0x02 ])); const hash2 = keccak256 ( toUtf8Bytes ( 'hello' )); const topic = id ( 'Transfer(address,address,uint256)' ); const packed = solidityPackedKeccak256 ( [ 'address' , 'uint256' ], [ '0x742d35Cc6634C0532925a3b8D4C9B569890FaC1c' , 100n ], ); viem import { keccak256, toBytes } from 'viem' ; const hash = keccak256 ( toBytes ( 'hello' )); web3.js const hash = web3. utils . keccak256 ( 'hello' ); const packed = web3. utils . soliditySha3 ( { type : 'address' , value : '0x742d35Cc6634C0532925a3b8D4C9B569890FaC1c' }, { type : 'uint256' , value : '100' }, ); Common patterns import { id, keccak256, AbiCoder } from 'ethers' ; const selector = id ( 'transfer(address,uint256)' ). slice ( 0 , 10 ); const typeHash = keccak256 ( toUtf8Bytes ( 'Transfer(address from,address to,uint256 value)' )); function getMappingSlot ( key : string , mappingSlot : number ): string { return keccak256 ( AbiCoder . defaultAbiCoder (). encode ([ 'address' , 'uint256' ], [key, mappingSlot]), ); } Address from public key import { keccak256 } from 'ethers' ; function pubkeyToAddress ( pubkeyBytes : Uint8Array ): string { const hash = keccak256 (pubkeyBytes. slice ( 1 )); return '0x' + hash. slice (- 40 ); } Audit your codebase grep -rn "createHash.*sha3" --include= "*.ts" --include= "*.js" --exclude-dir=node_modules . grep -rn "keccak256" --include= "*.ts" --include= "*.js" . | grep -v node_modules Rule For Ethereum contexts, never use crypto.createHash('sha3-256') . Use Keccak-aware helpers from ethers , viem , web3 , or another explicit Keccak implementation.
このスキルを起動するキーワード。クリックでコピーできます。
このスキルにはトリガーワードがありません。
ダウンロードした .skill に含まれるフィールド。
| フィールド | 説明 |
|---|---|
| format | フォーマット識別子（skill/v1） |
| skill_id | スキル固有 ID |
| name | スキル名 |
| version | バージョン |
| description | 説明 |
| category | カテゴリ（配列） |
| trigger_words | トリガーワード |
| tags | タグ |
| source | ソース |
| source_url | ソース URL（本ページ） |
| exported_at | エクスポート日時（ダウンロード毎） |
| system_prompt | システムプロンプト本文 |
| model_config | モデル設定：provider / model / temperature / max_tokens / top_p |
| examples | サンプル |
| install_guide | 各プラットフォームの導入説明（Coze / Dify / Claude / カスタム） |
