@polkadot/util-crypto/ethereum/isChecksum.js

A collection of useful crypto utilities for @polkadot

import { u8aToHex } from '@polkadot/util';
import { keccakAsU8a } from '../keccak/index.js';
function isInvalidChar(char, byte) {
    return char !== (byte > 7
        ? char.toUpperCase()
        : char.toLowerCase());
}
export function isEthereumChecksum(_address) {
    const address = _address.replace('0x', '');
    const hash = u8aToHex(keccakAsU8a(address.toLowerCase()), -1, false);
    for (let i = 0; i < 40; i++) {
        if (isInvalidChar(address[i], parseInt(hash[i], 16))) {
            return false;
        }
    }
    return true;
}