Principles and usage of encryption and decryption in PHP

This article mainly introduces the PHP encryption and decryption class. It analyzes the principles and related techniques of encryption and decryption in PHP with examples. It is of great practical value. Friends in need can refer to it.

The examples in this article describe PHP Encryption and decryption classes. The specific analysis is as follows:

This code supports array encryption, ciphertext validity period, and various symmetric encryption

The parameters are as follows:

* @use ption::en($ string, $key);
* @param String $string The string that needs to be encrypted
* @param String $skey The key
* @param int $expiry The validity period of the ciphertext, valid during encryption, in seconds , 0 is permanently valid
* @return String

1. The php code is as follows:

/*
 * -工具库-加密解密码
*/
class ption
{
 private static $original = array('=', '+', '/');
 private static $later = array('O0O0O', 'o0O0o', 'oo00o');
 function __construct()
 {
 }
 private static function md5($skey = '')
 {
  $skey = $skey ? $skey : 'ui' ; //uicms::_config('security/authkey');
  return md5(substr($skey, 0, 16));
 }
 /**
 * @use ption::en($string, $key);
 * @param String $string 需要加密的字串
 * @param String $skey 密钥
 * @param int $expiry 密文有效期, 加密时候有效， 单位 秒，0 为永久有效
 * @return String
 */
 static public function en($string = '', $skey = '', $expiry=0)
 {   
  if( is_array( $string ) )
  {
   $string = json_encode($string); // uicms::json($string, true, 'en');
  }     
  $string = str_pad($expiry ? $expiry + TIME : 0, 10, 0).$string;  
  $strArr = str_split(base64_encode($string));
  $strCount = count($strArr);  
  $skey = static::md5($skey);  
  foreach (str_split($skey) as $key => $value)
  {
   $key < $strCount && $strArr[$key].=$value;
  }
  return str_replace(self::$original, self::$later, join(&#39;&#39;, $strArr));
 }
 /**
 * @use ption::de($string, $key);
 * @param String $string 需要解密的字串
 * @param String $skey 密钥
 * @return String
 */
 static public function de($string = &#39;&#39;, $skey = &#39;&#39;)
 {   
  $strArr = str_split(str_replace(self::$later,self::$original,$string),2);
  $strCount = count($strArr);
  $skey = static::md5($skey);
  foreach (str_split($skey) as $key => $value)
  {
   $key < $strCount && $strArr[$key][1] === $value && $strArr[$key] = $strArr[$key][0];
  }   
  $result = base64_decode(join(&#39;&#39;, $strArr));
  if(substr($result, 0, 10) == 0 || substr($result, 0, 10) - TIME > 0)
  {
   return substr($result, 10);
  }
  else
  {
   return false;
  }   
 }  
}

2. The usage is as follows:

$str['username'] = 'oschina';
$str['pw'] = '123456';
$str['huoxin'] = '!@#$%^&';
echo "string : " . $str . " <br />";
echo "encode : " . ($enstring = ption::en($str)) . &#39;<br />&#39;;
echo "decode : " . ption::de($enstring);

Summary : The above is the entire content of this article, I hope it will be helpful to everyone's study.

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