php blowfish加密解密算法

PHP Blowfish 算法的加密解密，供大家参考，具体内容如下

    <?php

    /**
     * php blowfish 算法
     * Class blowfish
     */
    class blowfish{
     /**
      * blowfish + cbc模式 + pkcs5补码 加密
      * @param string $str 需要加密的数据
      * @return string 加密后base64加密的数据
      */
     public function blowfish_cbc_pkcs5_encrypt($str)
     {
      $cipher = mcrypt_module_open(MCRYPT_BLOWFISH, '', MCRYPT_MODE_CBC, '');

      //pkcs5补码
      $size = mcrypt_get_block_size(MCRYPT_BLOWFISH, MCRYPT_MODE_CBC);
      $str = $this->pkcs5_pad($str, $size);

      if (mcrypt_generic_init($cipher, $this->key, $this->iv) != -1)
      {
       $cipherText = mcrypt_generic($cipher, $str);
       mcrypt_generic_deinit($cipher);

       return base64_encode($cipherText);
      }

      mcrypt_module_close($cipher);
     }

     /**
      * blowfish + cbc模式 + pkcs5 解密 去补码
      * @param string $str 加密的数据
      * @return string 解密的数据
      */
     public function blowfish_cbc_pkcs5_decrypt($str)
     {
      $cipher = mcrypt_module_open(MCRYPT_BLOWFISH, '', MCRYPT_MODE_CBC, '');

      if (mcrypt_generic_init($cipher, $this->key, $this->iv) != -1)
      {
       $cipherText = mdecrypt_generic($cipher, base64_decode($str));
       mcrypt_generic_deinit($cipher);

       return $this->pkcs5_unpad($cipherText);
      }

      mcrypt_module_close($cipher);
     }

     private function pkcs5_pad($text, $blocksize){
      $pad = $blocksize - (strlen ( $text ) % $blocksize);
      return $text . str_repeat ( chr ( $pad ), $pad );
     }

     private function pkcs5_unpad($str){
      $pad = ord($str[($len = strlen($str)) - 1]);
      return substr($str, 0, strlen($str) - $pad);
     }
    }

BlowFish加密算法在php的使用第二例

    <?php

     $cipher = mcrypt_module_open(MCRYPT_BLOWFISH, '', MCRYPT_MODE_CBC, '');

     // The block-size of the Blowfish algorithm is 64-bits, therefore our IV
     // is always 8 bytes:
     $iv = '12345678';

     $key256 = '1234567890123456ABCDEFGHIJKLMNOP';
     $key128 = '1234567890123456';

     printf("iv: %s\n",bin2hex($iv));
     printf("key256: %s\n",bin2hex($key256));
     printf("key128: %s\n",bin2hex($key128));

     $cleartext = 'The quick brown fox jumped over the lazy dog';
     printf("clearText: %s\n\n",$cleartext);

     // Do 256-bit blowfish encryption:
     // The strengh of the encryption is determined by the length of the key
     // passed to mcrypt_generic_init
     if (mcrypt_generic_init($cipher, $key256, $iv) != -1)
     {
      // PHP pads with NULL bytes if $cleartext is not a multiple of the block size..
      $cipherText = mcrypt_generic($cipher,$cleartext );
      mcrypt_generic_deinit($cipher);

      // Display the result in hex.
      printf("256-bit blowfish encrypted:\n%s\n\n",bin2hex($cipherText));
     }

     // 128-bit blowfish encryption:
     if (mcrypt_generic_init($cipher, $key128, $iv) != -1)
     {
      // PHP pads with NULL bytes if $cleartext is not a multiple of the block size..
      $cipherText = mcrypt_generic($cipher,$cleartext );
      mcrypt_generic_deinit($cipher);

      // Display the result in hex.
      printf("128-bit blowfish encrypted:\n%s\n\n",bin2hex($cipherText));
     }

     // -------
     // Results
     // -------
     // You may use these as test vectors for testing your Blowfish implementations...
     // 
     // iv: 3132333435363738
     // key256: 313233343536373839303132333435364142434445464748494a4b4c4d4e4f50
     // key128: 31323334353637383930313233343536
     // clearText: The quick brown fox jumped over the lazy dog
     // 
     // 256-bit blowfish encrypted:
     // 276855ca6c0d60f7d9708210440c1072e05d078e733b34b4198d609dc2fcc2f0c30926cdef3b6d52baf6e345aa03f83e
     // 
     // 128-bit blowfish encrypted:
     // d2b5abb73208aea3790621d028afcc74d8dd65fb9ea8e666444a72523f5ecca60df79a424e2c714fa6efbafcc40bdca0 

    ?>

以上就是本文的全部内容，希望对大家学习php程序设计有所帮助。