[笔记]几种PHP加密算法

1. Discuz authcode

 0 验证数据有效性         // substr($result, 10, 16) == substr(md5(substr($result, 26).$keyb), 0, 16) 验证数据完整性         // 验证数据有效性，请看未加密明文的格式          if(( substr ( $result ,  0 ,  10 ) ==  0  ||  substr ( $result ,  0 ,  10 ) -  time () >  0 ) &&  substr ( $result ,  10 ,  16 ) ==  substr ( md5 ( substr ( $result ,  26 ). $keyb ),  0 ,  16 )) {             return  substr ( $result ,  26 );         } else {             return  '' ;         }     } else {          // 把动态密匙保存在密文里，这也是为什么同样的明文，生产不同密文后能解密的原因         // 因为加密后的密文可能是一些特殊字符，复制过程可能会丢失，所以用base64编码          return  $keyc . str_replace ( '=' ,  '' ,  base64_encode ( $result ));     } }      $a  =  "www.test.com" ;  $b  =  authcode ( $a ,  "ENCODE" ,  "abc123" ); echo  $b . "
" ; echo  authcode ( $b ,  "DECODE" ,  "abc123" );

2. 简单对称加密算法

  * @date 2013-08-13 19:30  * @update 2014-10-10 10:10  * @return String  */   function  encode ( $string  =  '' ,  $skey  =  'cxphp' ) {      $strArr  =  str_split ( base64_encode ( $string ));      $strCount  =  count ( $strArr );     foreach ( str_split ( $skey ) as  $key  =>  $value )          $key  <  $strCount  &&  $strArr [ $key ].= $value ;     return  str_replace (array( '=' ,  '+' ,  '/' ), array( 'O0O0O' ,  'o000o' ,  'oo00o' ),  join ( '' ,  $strArr ));  }   /**  * 简单对称加密算法之解密  * @param String $string 需要解密的字串  * @param String $skey 解密KEY  * @author Anyon Zou   * @date 2013-08-13 19:30  * @update 2014-10-10 10:10  * @return String  */   function  decode ( $string  =  '' ,  $skey  =  'cxphp' ) {      $strArr  =  str_split ( str_replace (array( 'O0O0O' ,  'o000o' ,  'oo00o' ), array( '=' ,  '+' ,  '/' ),  $string ),  2 );      $strCount  =  count ( $strArr );     foreach ( str_split ( $skey ) as  $key  =>  $value )          $key  <=  $strCount   && isset( $strArr [ $key ]) &&  $strArr [ $key ][ 1 ] ===  $value  &&  $strArr [ $key ] =  $strArr [ $key ][ 0 ];     return  base64_decode ( join ( '' ,  $strArr ));  } echo  '
' ;  $str  =  '56,15123365247,54,四大古典风格' ; echo  "string : "  .  $str  .  " 
" ; echo  "encode : "  . ( $enstring  =  encode ( $str )) .  '
' ; echo  "decode : "  .  decode ( $enstring );
    
3. DES加密解密
    
 key  =  $key ;         if( $iv  ==  0 ){              $this -> iv  =  $key ;         }else{              $this -> iv  =  $iv ;         }     }        //加密      function  encrypt ( $str ){                 $size  =  mcrypt_get_block_size  (  MCRYPT_DES ,  MCRYPT_MODE_CBC  );          $str  =  $this -> pkcs5Pad  (  $str ,  $size  );                    $data = mcrypt_cbc ( MCRYPT_DES ,  $this -> key ,  $str ,  MCRYPT_ENCRYPT ,  $this -> iv );          //$data=strtoupper(bin2hex($data)); //返回大写十六进制字符串          return  base64_encode ( $data );     }            //解密      function  decrypt ( $str ){          $str  =  base64_decode  ( $str );          //$strBin = $this->hex2bin( strtolower($str));          $str  =  mcrypt_cbc ( MCRYPT_DES ,  $this -> key ,  $str ,  MCRYPT_DECRYPT ,  $this -> iv  );          $str  =  $this -> pkcs5Unpad (  $str  );         return  $str ;     }       function  hex2bin ( $hexData ){          $binData  =  "" ;         for( $i  =  0 ;  $i  <  strlen  (  $hexData  );  $i  +=  2 ){              $binData  .=  chr ( hexdec ( substr ( $hexData ,  $i ,  2 )));         }         return  $binData ;     }       function  pkcs5Pad ( $text ,  $blocksize ){          $pad  =  $blocksize  - ( strlen  (  $text  ) %  $blocksize );         return  $text  .  str_repeat  (  chr  (  $pad  ),  $pad  );     }       function  pkcs5Unpad ( $text ){          $pad  =  ord  (  $text  { strlen  (  $text  ) -  1 } );         if ( $pad  >  strlen  (  $text  ))             return  false ;         if ( strspn  (  $text ,  chr  (  $pad  ),  strlen  (  $text  ) -  $pad  ) !=  $pad )             return  false ;         return  substr  (  $text ,  0 , -  1  *  $pad  );     } }  $str  =  'abc' ;  $key =  '12345678' ;  //8位内  $crypt  = new  DES ( $key );  $mstr  =  $crypt -> encrypt ( $str );  $str  =  $crypt -> decrypt ( $mstr );   echo   $str . ' <=> ' . $mstr ;
    
4. PHP hex2bin
    
' ; echo  hexXbin ( $t );