Prevents Ethereum hash errors by using Keccak-256 instead of Node's sha3-256. Covers ethers, viem, web3.js for selectors, signatures, storage slots, and address derivation.
How this skill is triggered — by the user, by Claude, or both
Slash command
/everything-claude-code:nodejs-keccak256The summary Claude sees in its skill listing — used to decide when to auto-load this skill
以太坊使用 Keccak-256,而不是 Node 的 `crypto.createHash('sha3-256')` 暴露的 NIST 标准化 SHA3 变体。
以太坊使用 Keccak-256,而不是 Node 的 crypto.createHash('sha3-256') 暴露的 NIST 标准化 SHA3 变体。
两种算法对相同输入产生不同的输出,并且 Node 不会警告您。
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
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],
);
import { keccak256, toBytes } from 'viem';
const hash = keccak256(toBytes('hello'));
const hash = web3.utils.keccak256('hello');
const packed = web3.utils.soliditySha3(
{ type: 'address', value: '0x742d35Cc6634C0532925a3b8D4C9B569890FaC1c' },
{ type: 'uint256', value: '100' },
);
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]),
);
}
import { keccak256 } from 'ethers';
function pubkeyToAddress(pubkeyBytes: Uint8Array): string {
const hash = keccak256(pubkeyBytes.slice(1));
return '0x' + hash.slice(-40);
}
grep -rn "createHash.*sha3" --include="*.ts" --include="*.js" --exclude-dir=node_modules .
grep -rn "keccak256" --include="*.ts" --include="*.js" . | grep -v node_modules
对于以太坊上下文,永远不要使用 crypto.createHash('sha3-256')。使用来自 ethers、viem、web3 或另一个显式 Keccak 实现的 Keccak 感知助手。
npx claudepluginhub aaione/everything-claude-code-zhDetects and prevents Keccak-256 vs NIST SHA3 confusion in Ethereum JavaScript/TypeScript code. Flags silent bugs in selectors, signatures, storage slots, and address derivation when Node's crypto.createHash('sha3-256') is used instead of Keccak.
Provides QuickNode SDK and ethers.js patterns for production blockchain dApps: provider singletons, retry logic, batch RPC calls, multi-chain support.
Implements hashing, HMAC signing, AES-256-GCM encryption, password hashing with scrypt, and secure random value generation using Node.js crypto.