Method and example analysis of implementing DES encryption and decryption in PHP

This article mainly introduces the DES encryption and decryption method implemented by PHP, and analyzes the related techniques of PHP implementation of DES encryption and decryption in the form of a complete example. Friends in need can refer to it

The details are as follows:

<?php
$key = &#39;very important data&#39;;
function jiami($key, $str)
{
  /* Open module, and create IV */
  $td = mcrypt_module_open(&#39;des&#39;, &#39;&#39;, &#39;ecb&#39;, &#39;&#39;);
  //$td = mcrypt_module_open(MCRYPT_DES, &#39;&#39;, MCRYPT_MODE_CBC, &#39;&#39;);
  //$td = mcrypt_module_open(&#39;des&#39;, &#39;&#39;, &#39;cbc&#39;, &#39;&#39;);
  $key = substr($key, 0, mcrypt_enc_get_key_size($td));
  $iv_size = mcrypt_enc_get_iv_size($td);
  $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
  /* Initialize encryption handle */
  if (mcrypt_generic_init($td, $key, $iv) === -1)
  {
    return FALSE;
  }
  /* Encrypt data */
  $c_t = mcrypt_generic($td, $str);
  /* Clean up */
  mcrypt_generic_deinit($td);
  mcrypt_module_close($td);
  return $c_t;
}
function jiemi($key, $str)
{
  /* Open module, and create IV */
  $td = mcrypt_module_open(&#39;des&#39;, &#39;&#39;, &#39;ecb&#39;, &#39;&#39;);
  //$td = mcrypt_module_open(MCRYPT_DES, &#39;&#39;, MCRYPT_MODE_CBC, &#39;&#39;);
  //$td = mcrypt_module_open(&#39;des&#39;, &#39;&#39;, &#39;cbc&#39;, &#39;&#39;);
  $key = substr($key, 0, mcrypt_enc_get_key_size($td));
  $iv_size = mcrypt_enc_get_iv_size($td);
  $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
  /* Initialize encryption handle */
  if (mcrypt_generic_init($td, $key, $iv) === -1)
  {
    return FALSE;
  }
  /* Reinitialize buffers for decryption */
  $p_t = mdecrypt_generic($td, $str);
  /* Clean up */
  mcrypt_generic_deinit($td);
  mcrypt_module_close($td);
  return trim($p_t);
}
$str = &#39;hello world!&#39;;
echo &#39;key:&#39; . $key . &#39;<br>&#39;;
echo &#39;str:&#39; . $str . &#39;<br>&#39;;
$jiami = jiami($key, $str);
echo &#39;加密:&#39; . $jiami . &#39;<br>&#39;;
file_put_contents(&#39;jiamiqian.txt&#39;, $str);
file_put_contents(&#39;jiamihou.txt&#39;, $jiami);
$jiemi = jiemi($key, $jiami);
echo &#39;解密:&#39; . $jiemi . &#39;<br>&#39;;

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