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<?php |
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/* |
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* This file is part of the mingyoung/dingtalk. |
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* |
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* (c) 张铭阳 <[email protected]> |
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* |
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* This source file is subject to the MIT license that is bundled |
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* with this source code in the file LICENSE. |
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*/ |
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namespace EasyDingTalk\Kernel\Encryption; |
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use function EasyDingTalk\str_random; |
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class Encryptor |
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{ |
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/** |
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* @var string |
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*/ |
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protected $key; |
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/** |
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* @var string |
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*/ |
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protected $token; |
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/** |
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* @var string |
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*/ |
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protected $aesKey; |
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/** |
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* @var int |
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*/ |
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protected $blockSize = 32; |
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/** |
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* Encryptor Constructor. |
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* |
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* @param string $key |
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* @param string $token |
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* @param string $aesKey |
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*/ |
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public function __construct($key, $token, $aesKey) |
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{ |
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$this->key = $key; |
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$this->token = $token; |
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$this->aesKey = base64_decode($aesKey.'=', true); |
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} |
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/** |
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* Encrypt the data. |
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* |
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* @param string $data |
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* @param string $nonce |
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* @param int $timestamp |
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* |
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* @return string |
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*/ |
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public function encrypt($data, $nonce = null, $timestamp = null) |
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{ |
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$string = str_random().pack('N', strlen($data)).$data.$this->key; |
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$result = base64_encode( |
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openssl_encrypt($this->pkcs7Pad($string), 'AES-256-CBC', $this->aesKey, OPENSSL_NO_PADDING, substr($this->aesKey, 0, 16)) |
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); |
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!is_null($nonce) || $nonce = uniqid(); |
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!is_null($timestamp) || $timestamp = time(); |
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return json_encode([ |
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'msg_signature' => $this->signature($this->token, $nonce, $timestamp, $result), |
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'timeStamp' => $timestamp, |
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'nonce' => $nonce, |
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'encrypt' => $result, |
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]); |
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} |
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/** |
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* Decrypt the data. |
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* |
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* @param string $data |
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* @param string $signature |
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* @param string $nonce |
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* @param int $timestamp |
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* |
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* @return string |
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*/ |
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public function decrypt($data, $signature, $nonce, $timestamp) |
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{ |
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if ($signature !== $this->signature($this->token, $nonce, $timestamp, $data)) { |
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throw new \RuntimeException('Invalid Signature.'); |
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} |
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$decrypted = openssl_decrypt( |
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base64_decode($data, true), 'AES-256-CBC', $this->aesKey, OPENSSL_NO_PADDING, substr($this->aesKey, 0, 16) |
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); |
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$result = $this->pkcs7Unpad($decrypted); |
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$data = substr($result, 16, strlen($result)); |
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$contentLen = unpack('N', substr($data, 0, 4))[1]; |
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if (substr($data, $contentLen + 4) !== $this->key) { |
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throw new \RuntimeException('Invalid CorpId.'); |
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} |
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return substr($data, 4, $contentLen); |
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} |
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/** |
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* Get SHA1. |
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* |
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* @return string |
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*/ |
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public function signature() |
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{ |
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$array = func_get_args(); |
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sort($array, SORT_STRING); |
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return sha1(implode($array)); |
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} |
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/** |
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* PKCS#7 pad. |
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* |
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* @param string $text |
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* |
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* @return string |
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*/ |
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public function pkcs7Pad(string $text) |
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{ |
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$padding = $this->blockSize - (strlen($text) % $this->blockSize); |
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$pattern = chr($padding); |
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return $text.str_repeat($pattern, $padding); |
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} |
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/** |
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* PKCS#7 unpad. |
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* |
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* @param string $text |
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* |
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* @return string |
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*/ |
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public function pkcs7Unpad(string $text) |
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{ |
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$pad = ord(substr($text, -1)); |
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if ($pad < 1 || $pad > $this->blockSize) { |
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$pad = 0; |
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} |
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return substr($text, 0, (strlen($text) - $pad)); |
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} |
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} |
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mingyoung /
dingtalk
