laochan-eacnet_backend/src/utils/rc4.ts

import { createHash } from "crypto";
import rc4 from 'arc4';

const EAMUSE_RC4_KEY = '69D74627D985EE2187161570D08D93B12455035B6DF0D8205DF5';

export function rc4Transfrom(keyHex: string, data: Buffer) {
  const key = createHash('md5')
      .update(keyHex + EAMUSE_RC4_KEY, 'hex')
      .digest();

    return rc4('arc4', key)
      .encodeBuffer(data)
}