PHP 복어 암호화 및 복호화 알고리즘

<?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, &#39;&#39;, MCRYPT_MODE_CBC, &#39;&#39;);
  
  //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, &#39;&#39;, MCRYPT_MODE_CBC, &#39;&#39;);
  
  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);
 }
}

<?php
  
 $cipher = mcrypt_module_open(MCRYPT_BLOWFISH, &#39;&#39;, MCRYPT_MODE_CBC, &#39;&#39;);
   
 // The block-size of the Blowfish algorithm is 64-bits, therefore our IV
 // is always 8 bytes:
 $iv = &#39;12345678&#39;;
  
 $key256 = &#39;1234567890123456ABCDEFGHIJKLMNOP&#39;;
 $key128 = &#39;1234567890123456&#39;;
  
 printf("iv: %s\n",bin2hex($iv));
 printf("key256: %s\n",bin2hex($key256));
 printf("key128: %s\n",bin2hex($key128));
  
 $cleartext = &#39;The quick brown fox jumped over the lazy dog&#39;;
 printf("clearText: %s\n\n",$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
  
?>