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import { createHash, SupportedAlgorithm } from "../deps.ts";import { xor } from "./util.ts";import { encode } from "./buffer.ts";
function hash(algorithm: SupportedAlgorithm, data: Uint8Array): Uint8Array {  return new Uint8Array(createHash(algorithm).update(data).digest());}
function mysqlNativePassword(password: string, seed: Uint8Array): Uint8Array {  const pwd1 = hash("sha1", encode(password));  const pwd2 = hash("sha1", pwd1);
  let seedAndPwd2 = new Uint8Array(seed.length + pwd2.length);  seedAndPwd2.set(seed);  seedAndPwd2.set(pwd2, seed.length);  seedAndPwd2 = hash("sha1", seedAndPwd2);
  return xor(seedAndPwd2, pwd1);}
function cachingSha2Password(password: string, seed: Uint8Array): Uint8Array {  const stage1 = hash("sha256", encode(password));  const stage2 = hash("sha256", stage1);  const stage3 = hash("sha256", Uint8Array.from([...stage2, ...seed]));  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":      return cachingSha2Password(password, seed);    default:      throw new Error("Not supported");  }}