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<?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);
}
}
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