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import { encode, Hash, sha256 } from "../deps.ts";
function xor(a: Uint8Array, b: Uint8Array): Uint8Array {  return a.map((byte, index) => {    return byte ^ b[index];  });}
function mysqlNativePassword(password: string, seed: Uint8Array): Uint8Array {  const hash = new Hash("sha1");  const pwd1 = hash.digest(encode(password)).data;  const pwd2 = hash.digest(pwd1).data;
  let seedAndPwd2 = new Uint8Array(seed.length + pwd2.length);  seedAndPwd2.set(seed);  seedAndPwd2.set(pwd2, seed.length);  seedAndPwd2 = hash.digest(seedAndPwd2).data;
  return xor(seedAndPwd2, pwd1);}
function cachingSha2Password(password: string, seed: Uint8Array): Uint8Array {  const stage1 = sha256(password, "utf8") as Uint8Array;  const stage2 = sha256(stage1) as Uint8Array;  const stage3 = sha256(Uint8Array.from([...stage2, ...seed])) as Uint8Array;  return xor(stage1, stage3);}
export default function auth(  authPluginName: string,  password: string,  seed: Uint8Array,) {  switch (authPluginName) {    case "mysql_native_password":      return mysqlNativePassword(password, seed);
    case "caching_sha2_password":    // TODO    // return cachingSha2Password(password, seed);    default:      throw new Error("Not supported");  }}