PHP可逆加密/解密函数分享

2015-01-24信息快讯网

很多项目的会员系统,都要求要有记住登录功能,在通过cookies实现功能是,由于要将客户信息直接保存到cookies,如果直接写入cookies势必会带来安全隐患,因此通过可逆加密后再保存到cookies相对就安全了

函数源码
 
function encrypt($data, $key) { 
$prep_code = serialize($data); 
$block = mcrypt_get_block_size('des', 'ecb'); 
if (($pad = $block - (strlen($prep_code) % $block)) < $block) { 
$prep_code .= str_repeat(chr($pad), $pad); 
} 
$encrypt = mcrypt_encrypt(MCRYPT_DES, $key, $prep_code, MCRYPT_MODE_ECB); 
return base64_encode($encrypt); 
} 

function decrypt($str, $key) { 
$str = base64_decode($str); 
$str = mcrypt_decrypt(MCRYPT_DES, $key, $str, MCRYPT_MODE_ECB); 
$block = mcrypt_get_block_size('des', 'ecb'); 
$pad = ord($str[($len = strlen($str)) - 1]); 
if ($pad && $pad < $block && preg_match('/' . chr($pad) . '{' . $pad . '}$/', $str)) { 
$str = substr($str, 0, strlen($str) - $pad); 
} 
return unserialize($str); 
} 

调用函数
 
$key = 'okyo.cn'; 
$data = array('id' => 100, 'username' => 'customer', 'password' => 'e10adc3949ba59abbe56e057f20f883e'); 
$snarr = serialize($data); 
$en = encrypt($data, $key); 
$de = decrypt($en, $key); 
echo "加密原型:"; 
print_r($data); 
echo " 
密钥:$key 

加密结果:$en 

解密结果:"; 
print_r($de); 
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