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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";import { incr32 } from "../incr32.js";
function getBlock(self) {  const out = self._cipher.encryptBlockRaw(self._prev);  incr32(self._prev);  return out;}
const blockSize = 16;export const encrypt = function (self, chunk) {  const chunkNum = Math.ceil(chunk.length / blockSize);  const start = self._cache.length;  self._cache = Buffer.concat([    self._cache,    Buffer.allocUnsafe(chunkNum * blockSize),  ]);  for (let i = 0; i < chunkNum; i++) {    const out = getBlock(self);    const offset = start + i * blockSize;    self._cache.writeUInt32BE(out[0], offset + 0);    self._cache.writeUInt32BE(out[1], offset + 4);    self._cache.writeUInt32BE(out[2], offset + 8);    self._cache.writeUInt32BE(out[3], offset + 12);  }  const pad = self._cache.slice(0, chunk.length);  self._cache = self._cache.slice(chunk.length);  return xor(chunk, pad);};