add clear

common/Decode.php

@@ -0,0 +1,99 @@
+<?php
+
+
+namespace common;
+
+
+class Decode
+{
+
+	private $sessionKey;
+	private $iv;
+	private $encryptedData;
+	private $appId;
+
+
+	private $OK = 0;
+	private $IllegalAesKey = -41001;
+	private $IllegalIv = -41002;
+	private $IllegalBuffer = -41003;
+	private $DecodeBase64Error = -41004;
+
+	/**
+	 * @param mixed $sessionKey
+	 * @return Decode
+	 */
+	public function setSessionKey($sessionKey)
+	{
+		$this->sessionKey = $sessionKey;
+		return $this;
+	}
+
+	/**
+	 * @param mixed $iv
+	 * @return Decode
+	 */
+	public function setIv($iv)
+	{
+		$this->iv = $iv;
+		return $this;
+	}
+
+	/**
+	 * @param mixed $encryptedData
+	 * @return Decode
+	 */
+	public function setEncryptedData($encryptedData)
+	{
+		$this->encryptedData = $encryptedData;
+		return $this;
+	}
+
+	/**
+	 * @param mixed $appId
+	 * @return Decode
+	 */
+	public function setAppId($appId)
+	{
+		$this->appId = $appId;
+		return $this;
+	}
+
+
+	/**
+	 * @param $asArray
+	 * @return array|mixed
+	 * @throws \Exception
+	 */
+	public function decode($asArray)
+	{
+		if (strlen($this->sessionKey) != 24) {
+			throw new \Exception('encodingAesKey 非法', $this->IllegalAesKey);
+		}
+
+		$aesKey = base64_decode($this->sessionKey);
+		if (strlen($this->iv) != 24) {
+			throw new \Exception('base64解密失败', $this->IllegalIv);
+		}
+
+		$aesIV = base64_decode($this->iv);
+		$aesCipher = base64_decode($this->encryptedData);
+		$result = openssl_decrypt($aesCipher, "AES-128-CBC", $aesKey, OPENSSL_RAW_DATA, $aesIV);
+		if ($result === false) {
+			throw new \Exception('aes 解密失败', $this->IllegalBuffer);
+		}
+
+		$dataObj = json_decode($result);
+		if ($dataObj->watermark->appid != $this->appId) {
+			throw new \Exception('aes 解密失败', $this->IllegalBuffer);
+		}
+
+		if ($asArray) {
+			return get_object_vars($dataObj);
+		}
+
+		return $dataObj;
+
+	}
+
+}