[李景山php]每天laravel-20160825|Encrypter
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<?php namespace Illuminate\Encryption; use RuntimeException; use Illuminate\Contracts\Encryption\DecryptException; use Illuminate\Contracts\Encryption\EncryptException; use Illuminate\Contracts\Encryption\Encrypter as EncrypterContract; class Encrypter extends BaseEncrypter implements EncrypterContract {// class Encrypter extends base Encrypter implements Encrypter Contract /** * The algorithm used for encryption. * * @var string */ protected $cipher;// a cipher is a string warehouse /** * Create a new encrypter instance. * * @param string $key * @param string $cipher * @return void * * @throws \RuntimeException */ public function __construct($key, $cipher = ‘AES-128-CBC‘) {// create a instance about encrypter $key = (string) $key;// change str to str if (static::supported($key, $cipher)) {// if it is has supported $this->key = $key;//set key $this->cipher = $cipher;// set cipher } else {// if not support throw new RuntimeException(‘The only supported ciphers are AES-128-CBC and AES-256-CBC with the correct key lengths.‘); }// throw new Exception } /** * Determine if the given key and cipher combination is valid. * * @param string $key * @param string $cipher * @return bool */ public static function supported($key, $cipher) { $length = mb_strlen($key, ‘8bit‘);// get length return ($cipher === ‘AES-128-CBC‘ && $length === 16) || ($cipher === ‘AES-256-CBC‘ && $length === 32); }// different way to get true or false /** * Encrypt the given value. * * @param string $value * @return string * * @throws \Illuminate\Contracts\Encryption\EncryptException */ public function encrypt($value) {// this function means to encrypt $iv = random_bytes($this->getIvSize());//random_bytes create a seed about rand $value = openssl_encrypt(serialize($value), $this->cipher, $this->key, 0, $iv); // a way to encrypted the string parameters if ($value === false) { throw new EncryptException(‘Could not encrypt the data.‘); }// throw error // Once we have the encrypted value we will go ahead base64_encode the input // vector and create the MAC for the encrypted value so we can verify its // authenticity. Then, we‘ll JSON encode the data in a "payload" array. $mac = $this->hash($iv = base64_encode($iv), $value);// get mac value by base64_encode() $json = json_encode(compact(‘iv‘, ‘value‘, ‘mac‘));// very good use if (! is_string($json)) {// is_string to check the json string throw new EncryptException(‘Could not encrypt the data.‘); }// throw E return base64_encode($json);// two base64_encode to encrypted the value } /** * Decrypt the given value. * * @param string $payload * @return string * * @throws \Illuminate\Contracts\Encryption\DecryptException */ public function decrypt($payload) { $payload = $this->getJsonPayload($payload);// get the payload $iv = base64_decode($payload[‘iv‘]);// get the iv $decrypted = openssl_decrypt($payload[‘value‘], $this->cipher, $this->key, 0, $iv); // use the openssl_decrypte if ($decrypted === false) { throw new DecryptException(‘Could not decrypt the data.‘); } return unserialize($decrypted);// use unserialize function } /** * Get the IV size for the cipher. * * @return int */ protected function getIvSize() { return 16; }// normal size is 16 }
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