php-libmcrypt-2.4.x Encryption-aes Encryption

mcrypt_get_block_size - get the packet size of the encryption algorithm

This function will be deprecated after PHP7.1.0.

int mcrypt_get_block_size (int $cipher)

int Mcrypt_get_block_size (string $cipher, String $mode)

The first prototype is for Libmcrypt 2.2.x, and the second prototype is for Libmcrypt 2.4.x or 2.5.x.

PHP AES Plus, decryption class:

<?phpclass security {public static function encrypt ($input,  $key)  {//  define  (' mcrypt_rijndael_128 ',  "rijndael-128");// 16 bytes, 128-bit// define  (' Mcrypt_ Mode_ecb ',  "ECB");//  commonly used encryption mode $size = mcrypt_get_block_size (Mcrypt_rijndael_128, mcrypt_ MODE_ECB);//  fill vacancy; Pkcs5_pad&pkcs7_pad difference is not very $input = security::p kcs5_pad ($input,  $size) ; $td  = mcrypt_module_open (mcrypt_rijndael_128,  ", mcrypt_mode_ecb, "); $iv  =  mcrypt_create_iv  (Mcrypt_enc_get_iv_size ($TD),  mcrypt_rand) mcrypt_generic_init ($td,  $key ,  $iv), $data  = mcrypt_generic ($td,  $input); Mcrypt_generic_deinit ($TD); Mcrypt_module_close ( $TD); $data  = base64_encode ($data);return  $data;}                  /**          *  $text &NBSP; encrypted string          *  $blocksize   chunk size, 16 bytes; Value 16          */private static function pkcs5_pad  ($text ,  $blocksize)  {$pad  =  $blocksize  -  (strlen ($text)  %  $blocksize);//   Use $pad ASCII values to populate empty return  $text  . str_repeat (Chr ($pad),  $pad);}  public static function decrypt ($sStr,  $sKey)  {$decrypted = mcrypt_decrypt ( mcrypt_rijndael_128, $sKey, Base64_decode ($SSTR), MCRYPT_MODE_ECB), $dec _s = strlen ($decrypted); $padding  = ord ($decrypted [$dec _s-1]); $decrypted  = substr ($decrypted,  0, -$padding); return  $decrypted;}}    //  $key  =  "1234567891234567";//  $data  =  ' {' user ': ' 1234556789 ', "pwd": "4343434343", "tel": "18988888888", "Realname": "Zhangsan"} '; //  $value  = security:: Encrypt ($data  ,  $key  );// echo  "Encrypt::" $value. ' <br/> ';// echo security::d ecrypt ($value,  $key  );

Used in code:

   /**     *  encryption, decryption      */     function zm_ecrypt ()     {           Encryption, decryption          $string  =  ' {' user ': ' 1234556789 ', ' pwd ': ' 4343434343 "," tel ":" 18988888888 "," Realname ":" Zhangsan "} ';                 vendor (' Encrypt. Security ')  or die ("Scenario 7 introduced failure");         $sec  = new  \security ();        //  The second parameter key is Base64_encode encrypted           $sec _res1 =  $sec->encrypt ($string,  " Em1hcnrlaziwmtc5odc2ntqzmjewmtiz ");        //  result turn 16           $sec _res = tohexstring (Base64_decode ($sec _res1));                 //   Decryption         //  first turn hex into a string and then base64_encode          $demo  = base64_encode (hextostr ($sec _res));          $sec _dec =  $sec->decrypt ($demo,  " Em1hcnrlaziwmtc5odc2ntqzmjewmtiz ");//         var_dump (" \r\ N Scenario 7 encryption results \ r \  .  $sec _res);//         var_dump ("\r\ N Scenario 7 decryption results \ r \  .  $sec _dec);//         return  $as _ res_encrypt;    }

When using, be aware of Base64_encode and base64_decode, whether the key and string are encoded.

The conversion between the hexadecimal and the string used:

   /**     *  Hex to String      *  16 Binary to 2 binary string          *  @param   hex   $hex       *  @return  string     */     Function hextostr ($hex)     {         $string = " ";         for ($i =0; $i <strlen ($hex)-1; $i +=2)               $string. =CHR (Hexdec ($hex [$i]. $hex [$i +1]);         return   $string;    }         /**     *  convert $string to hexadecimal      *   @param  string  $string      *  @return  stream      */    function tohexstring  ($string) {         $buf  =   "";        for  ($i  = 0;  $i  <  Strlen ($string);  $i + +) {             $val   = dechex (Ord ($string {$i}));             if ( Strlen ($val) < 2)                   $val  =  "0". $val;             $buf  .=  $val;        }         return  $buf;     }

This article from "for the Future" blog, declined reprint!

php-libmcrypt-2.4.x Encryption-aes Encryption