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// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.// Copyright 2014-2017 browserify-aes contributors. All rights reserved. MIT license.// Copyright 2013 Maxwell Krohn. All rights reserved. MIT license.// Copyright 2009-2013 Jeff Mott. All rights reserved. MIT license.
import { xor } from "../xor.ts";import { Buffer } from "../../../../buffer.ts";
function encryptStart(self, data, decrypt) {  const len = data.length;  const out = xor(data, self._cache);  self._cache = self._cache.slice(len);  self._prev = Buffer.concat([self._prev, decrypt ? data : out]);  return out;}
export const encrypt = function (self, data, decrypt) {  let out = Buffer.allocUnsafe(0);  let len;
  while (data.length) {    if (self._cache.length === 0) {      self._cache = self._cipher.encryptBlock(self._prev);      self._prev = Buffer.allocUnsafe(0);    }
    if (self._cache.length <= data.length) {      len = self._cache.length;      out = Buffer.concat([        out,        encryptStart(self, data.slice(0, len), decrypt),      ]);      data = data.slice(len);    } else {      out = Buffer.concat([out, encryptStart(self, data, decrypt)]);      break;    }  }
  return out;};