/**
* Run the mcrypt decryption routine for the value.
*
* @param string $value
* @param string $iv
* @return string
*
* @throws \Illuminate\Contracts\Encryption\DecryptException
*/
protected function mcryptDecrypt($value, $iv)
{
try {
return mcrypt_decrypt($this->cipher, $this->key, $value, MCRYPT_MODE_CBC, $iv);
} catch (Exception $e) {
throw new DecryptException($e->getMessage());
}
}//run function to decryption routine
// this is a wrap about the mcrypt_decrypt
/**
* Add PKCS7 padding to a given value.
*
* @param string $value
* @return string
*/
protected function addPadding($value)
{
$pad = $this->block - (strlen($value) % $this->block);// this is a number
return $value.str_repeat(chr($pad), $pad);// get this wale repeat this
}// bad pad function
/**
* Remove the padding from the given value.
*
* @param string $value
* @return string
*/
protected function stripPadding($value)
{
$pad = ord($value[($len = strlen($value)) - 1]);
return $this->paddingIsValid($pad, $value) ? substr($value, 0, $len - $pad) : $value;
}// remove the padding from the given value.
// check this value
/**
* Determine if the given padding for a value is valid.
*
* @param string $pad
* @param string $value
* @return bool
*/
protected function paddingIsValid($pad, $value)
{
$beforePad = strlen($value) - $pad;
return substr($value, $beforePad) == str_repeat(substr($value, -1), $pad);
}// check pad valid
/**
* Get the IV size for the cipher.
*
* @return int
*/
protected function getIvSize()
{
return mcrypt_get_iv_size($this->cipher, MCRYPT_MODE_CBC);
}// get the iv size
/**
* Get the random data source available for the OS.
*
* @return int
*/
protected function getRandomizer()// get the random
{
if (defined(‘MCRYPT_DEV_URANDOM‘)) {
return MCRYPT_DEV_URANDOM;
}
if (defined(‘MCRYPT_DEV_RANDOM‘)) {
return MCRYPT_DEV_RANDOM;
}
mt_srand();
return MCRYPT_RAND;
}
}本文出自 “专注php” 博客，请务必保留此出处http://jingshanls.blog.51cto.com/3357095/1788994
[李景山php]每天laravel-20160829|McryptEncrypter-3
原文地址：http://jingshanls.blog.51cto.com/3357095/1788994
