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SKILL

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.

Target: Software development & testing. Automatically collected · unverified.

Excerpt from the author’s documentation

Extracted from a fixed version of SKILL.md in its original language. This is the author’s documentation; installation, compatibility and runtime results have not been verified by this site.

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Topics in the source

  • Node.js Keccak-256
  • When to Use
  • How It Works
  • Examples
  • ethers v6
  • viem
  • web3.js
  • Common patterns

Ethereum uses Keccak-256, not the NIST-standardized SHA3 variant exposed by Node's crypto.createHash('sha3-256'). 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 The two algorithms produce different outputs for the same input, and Node will not warn you. For Ethereum contexts, never use crypto.createHash('sha3-256'). Use Keccak-aware helpers from ethers, viem, web3, or another explicit Keccak implementation.

Source repository
affaan-m/ECC
Source file
skills/nodejs-keccak256/SKILL.md
Fixed revision
d2ef2680594f9a17526a6e1a2e18b3d242c5d17b
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This record was collected automatically. Its documentation, suitability and runtime behavior have not been manually verified.

Author: affaan-m/ECC · original repository metadata. Documentation review: Not reviewed. Last source check: 2026-11-09T15:01:44.137Z.

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MIT. Third-party content and copyright remain with their authors. Refer to the original license and terms.

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