123456789101112131415161718192021222324252627282930313233343536373839404142434445464748
// 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 { Buffer } from "../../../../buffer.ts";
function encryptByte(self, byteParam, decrypt) {  let pad;  let i = -1;  const len = 8;  let out = 0;  let bit, value;  while (++i < len) {    pad = self._cipher.encryptBlock(self._prev);    bit = (byteParam & (1 << (7 - i))) ? 0x80 : 0;    value = pad[0] ^ bit;    out += (value & 0x80) >> (i % 8);    self._prev = shiftIn(self._prev, decrypt ? bit : value);  }  return out;}
function shiftIn(buffer, value) {  const len = buffer.length;  let i = -1;  const out = Buffer.allocUnsafe(buffer.length);  buffer = Buffer.concat([buffer, Buffer.from([value])]);
  while (++i < len) {    out[i] = buffer[i] << 1 | buffer[i + 1] >> (7);  }
  return out;}
export const encrypt = function (self, chunk, decrypt) {  const len = chunk.length;  const out = Buffer.allocUnsafe(len);  let i = -1;
  while (++i < len) {    out[i] = encryptByte(self, chunk[i], decrypt);  }
  return out;};