| 1 | import { u8aToHex } from '@polkadot/util';
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| 2 | import { keccakAsU8a } from '../keccak/index.js';
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| 3 | function isInvalidChar(char, byte) {
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| 4 | return char !== (byte > 7
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| 5 | ? char.toUpperCase()
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| 6 | : char.toLowerCase());
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| 7 | }
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| 8 | export function isEthereumChecksum(_address) {
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| 9 | const address = _address.replace('0x', '');
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| 10 | const hash = u8aToHex(keccakAsU8a(address.toLowerCase()), -1, false);
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| 11 | for (let i = 0; i < 40; i++) {
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| 12 | if (isInvalidChar(address[i], parseInt(hash[i], 16))) {
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| 13 | return false;
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| 14 | }
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| 15 | }
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| 16 | return true;
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| 17 | }
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