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<?php
/**
* 加密工具类
*
* User: jiehua
* Date: 16/3/30
* Time: 下午3:25
*/
/**
* 加密方法
* @param string $str
* @return string
*/
function encrypt($str, $screct_key)
{
//AES, 128 模式加密数据 CBC
$screct_key = base64_decode($screct_key);
$str = trim($str);
$str = addPKCS7Padding($str);
//设置全0的IV
$iv = str_repeat("\0", 16);
$encrypt_str = openssl_encrypt($str, 'aes-128-cbc', $screct_key, OPENSSL_NO_PADDING, $iv);
return base64_encode($encrypt_str);
}
/**
* 解密方法
* @param string $str
* @return string
*/
function decrypt($str, $screct_key)
{
//AES, 128 模式加密数据 CBC
$str = base64_decode($str);
$screct_key = base64_decode($screct_key);
//设置全0的IV
$iv = str_repeat("\0", 16);
$decrypt_str = openssl_decrypt($str, 'aes-128-cbc', $screct_key, OPENSSL_NO_PADDING, $iv);
$decrypt_str = stripPKSC7Padding($decrypt_str);
return $decrypt_str;
}
/**
* 填充算法
* @param string $source
* @return string
*/
function addPKCS7Padding($source)
{
$source = trim($source);
$block = 16;
$pad = $block - (strlen($source) % $block);
if ($pad <= $block) {
$char = chr($pad);
$source .= str_repeat($char, $pad);
}
return $source;
}
/**
* 移去填充算法
* @param string $source
* @return string
*/
function stripPKSC7Padding($source)
{
$char = substr($source, -1);
$num = ord($char);
if ($num == 62) return $source;
$source = substr($source, 0, -$num);
return $source;
}