php blowfish加密解密算法

<?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);
 }
}

<?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 
 
?>