eip-712/lib/es/utils/buffer.js

Tiny library with utility functions that can help with signing and verifying EIP-712 based messages

import { keccak_256 } from '@noble/hashes/sha3';
import { hexToBytes, utf8ToBytes } from '@noble/hashes/utils';
export const keccak256 = (data, encoding) => {
  if (typeof data === 'string' && encoding === 'utf8') {
    return keccak_256(toBuffer(data, encoding));
  }

  return keccak_256(data);
};
export const toBuffer = (data, encoding = 'hex') => {
  if (encoding === 'hex') {
    if (data.startsWith('0x')) {
      return hexToBytes(data.substring(2));
    }

    return hexToBytes(data);
  }

  return utf8ToBytes(data);
};
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