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这篇文章主要为大家详细介绍了php blowfish加密解密算法的相关资料，感兴趣的朋友可以参考一下

<?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。