php blowfish加密解密具体算法

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 

?>