huahuibao/vendor/weixinSecret/pkcs7Encoder.php

<?php

include_once "errorCode.php";

/**
 * PKCS7Encoder class
 *
 * 提供基于PKCS7算法的加解密接口.
 */
class PKCS7Encoder
{
	public static $block_size = 32;

	/**
	 * 对需要加密的明文进行填充补位
	 * @param $text 需要进行填充补位操作的明文
	 * @return 补齐明文字符串
	 */
	function encode($text)
	{
		$block_size = PKCS7Encoder::$block_size;
		$text_length = strlen($text);
		//计算需要填充的位数
		$amount_to_pad = PKCS7Encoder::$block_size - ($text_length % PKCS7Encoder::$block_size);
		if ($amount_to_pad == 0) {
			$amount_to_pad = PKCS7Encoder::block_size;
		}
		//获得补位所用的字符
		$pad_chr = chr($amount_to_pad);
		$tmp = "";
		for ($index = 0; $index < $amount_to_pad; $index++) {
			$tmp .= $pad_chr;
		}
		return $text . $tmp;
	}

	/**
	 * 对解密后的明文进行补位删除
	 * @param decrypted 解密后的明文
	 * @return 删除填充补位后的明文
	 */
	function decode($text)
	{

		$pad = ord(substr($text, -1));
		if ($pad < 1 || $pad > 32) {
			$pad = 0;
		}
		return substr($text, 0, (strlen($text) - $pad));
	}

}

/**
 * Prpcrypt class
 *
 * 提供接收和推送给公众平台消息的加解密接口.
 */
class Prpcrypt
{
	public $key;

	function __construct($k)
	{
		$this->key = base64_decode($k . "=");
	}
	
	
	/**
	 * 对明文进行加密
	 * @param string $text 需要加密的明文
	 * @return string 加密后的密文
	 */
	public function encrypt($text, $appid)
	{
		try {
			if(version_compare(PHP_VERSION, '7','>=')) {
				//获得16位随机字符串，填充到明文之前
				$random = $this->getRandomStr();
				$text = $random . pack("N", strlen($text)) . $text . $appid;
				$iv = substr($this->key, 0, 16);
				$pkc_encoder = new PKCS7Encoder;
				$text = $pkc_encoder->encode($text);
				$encrypted = openssl_encrypt($text,'AES-256-CBC',substr($this->key, 0, 32),OPENSSL_ZERO_PADDING,$iv);
			} else {
				//获得16位随机字符串，填充到明文之前
				$random = $this->getRandomStr();
				$text = $random . pack("N", strlen($text)) . $text . $appid;
				// 网络字节序
				$size = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC);
				$module = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, '');
				$iv = substr($this->key, 0, 16);
				//使用自定义的填充方式对明文进行补位填充
				$pkc_encoder = new PKCS7Encoder;
				$text = $pkc_encoder->encode($text);
				mcrypt_generic_init($module, $this->key, $iv);
				//加密
				$encrypted = mcrypt_generic($module, $text);
				mcrypt_generic_deinit($module);
				mcrypt_module_close($module);
				$encrypted = base64_encode($encrypted);
			}
			
			//print($encrypted);
			//使用BASE64对加密后的字符串进行编码
			return array(ErrorCode::$OK, $encrypted);
		} catch (Exception $e) {
			//print $e;
			return array(ErrorCode::$EncryptAESError, null);
		}
	}
	
	
	/**
	 * 对密文进行解密
	 * @param string $encrypted 需要解密的密文
	 * @return string 解密得到的明文
	 */
	public function decrypt($encrypted, $appid)
	{
		
		try {
			if(version_compare(PHP_VERSION, '7','>=')) {
				$iv = substr($this->key, 0, 16);
				$decrypted = openssl_decrypt($encrypted,'AES-256-CBC',substr($this->key, 0, 32),OPENSSL_ZERO_PADDING,$iv);
			} else {
				//使用BASE64对需要解密的字符串进行解码
				$ciphertext_dec = base64_decode($encrypted);
				$module = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, '');
				$iv = substr($this->key, 0, 16);
				mcrypt_generic_init($module, $this->key, $iv);
				
				//解密
				$decrypted = mdecrypt_generic($module, $ciphertext_dec);
				mcrypt_generic_deinit($module);
				mcrypt_module_close($module);
			}
			
		} catch (Exception $e) {
			return array(ErrorCode::$DecryptAESError, null);
		}
		
		
		try {
			//去除补位字符
			$pkc_encoder = new PKCS7Encoder;
			$result = $pkc_encoder->decode($decrypted);
			//去除16位随机字符串,网络字节序和AppId
			if (strlen($result) < 16)
				return "";
			$content = substr($result, 16, strlen($result));
			$len_list = unpack("N", substr($content, 0, 4));
			$xml_len = $len_list[1];
			$xml_content = substr($content, 4, $xml_len);
			$from_appid = substr($content, $xml_len + 4);
			if(version_compare(PHP_VERSION, '7','>=')) {
				if (!$appid) {
					//如果传入的appid是空的，则认为是订阅号，使用数据中提取出来的appid
					$appid = $from_appid;
				}
			}
		} catch (Exception $e) {
			//print $e;
			return array(ErrorCode::$IllegalBuffer, null);
		}
		if ($from_appid != $appid)
			return array(ErrorCode::$ValidateAppidError, null);
		//不注释上边两行，避免传入appid是错误的情况
		if(version_compare(PHP_VERSION, '7','>=')) {
			//增加appid，为了解决后面加密回复消息的时候没有appid的订阅号会无法回复
			return array(0, $xml_content, $from_appid);
		} else {
			return array(0, $xml_content);
		}
		
	}


	/**
	 * 随机生成16位字符串
	 * @return string 生成的字符串
	 */
	function getRandomStr()
	{

		$str = "";
		$str_pol = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz";
		$max = strlen($str_pol) - 1;
		for ($i = 0; $i < 16; $i++) {
			$str .= $str_pol[mt_rand(0, $max)];
		}
		return $str;
	}

}

?>