| 1 | import { u8aToHex, u8aToU8a } from '@polkadot/util';
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| 2 | import { keccakAsU8a } from '../keccak/index.js';
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| 3 | import { secp256k1Expand } from '../secp256k1/index.js';
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| 4 | function getH160(u8a) {
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| 5 | if ([33, 65].includes(u8a.length)) {
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| 6 | u8a = keccakAsU8a(secp256k1Expand(u8a));
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| 7 | }
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| 8 | return u8a.slice(-20);
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| 9 | }
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| 10 | export function ethereumEncode(addressOrPublic) {
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| 11 | if (!addressOrPublic) {
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| 12 | return '0x';
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| 13 | }
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| 14 | const u8aAddress = u8aToU8a(addressOrPublic);
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| 15 | if (![20, 32, 33, 65].includes(u8aAddress.length)) {
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| 16 | throw new Error(`Invalid address or publicKey provided, received ${u8aAddress.length} bytes input`);
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| 17 | }
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| 18 | const address = u8aToHex(getH160(u8aAddress), -1, false);
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| 19 | const hash = u8aToHex(keccakAsU8a(address), -1, false);
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| 20 | let result = '';
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| 21 | for (let i = 0; i < 40; i++) {
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| 22 | result = `${result}${parseInt(hash[i], 16) > 7 ? address[i].toUpperCase() : address[i]}`;
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| 23 | }
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| 24 | return `0x${result}`;
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| 25 | }
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