@pharosnames/address-encoder/src/coin/etn.ts

Encodes and decodes address formats for various cryptocurrencies with Pharos network support

import { keccak_256 } from "@noble/hashes/sha3";
import { concatBytes } from "@noble/hashes/utils";
import { utils } from "@scure/base";
import type { CheckedCoin } from "../types.js";
import { decodeXmrAddress, encodeXmrAddress } from "./xmr.js";

const name = "etn";
const coinType = 415;

const type = 18;

const etnChecksum = utils.checksum(4, keccak_256);

export const encodeEtnAddress = (source: Uint8Array): string => {
  const sourceWithType = concatBytes(new Uint8Array([type]), source);
  const checksummed = etnChecksum.encode(sourceWithType);
  return encodeXmrAddress(checksummed);
};
export const decodeEtnAddress = (source: string): Uint8Array => {
  const decoded = decodeXmrAddress(source);

  if (decoded[0] !== 18) throw new Error("Unrecognised address format");

  const checksummed = etnChecksum.decode(decoded);

  return checksummed.slice(1);
};

export const etn = {
  name,
  coinType,
  encode: encodeEtnAddress,
  decode: decodeEtnAddress,
} as const satisfies CheckedCoin;