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common/Decode.php

@@ -0,0 +1,117 @@
+<?php
+
+
+namespace wchat\common;
+
+
+class Decode
+{
+
+	private string $sessionKey;
+	private string $iv;
+	private string $encryptedData;
+	private string $appId;
+
+
+	private int $OK = 0;
+	private int $IllegalAesKey = -41001;
+	private int $IllegalIv = -41002;
+	private int $IllegalBuffer = -41003;
+	private int $DecodeBase64Error = -41004;
+
+	/**
+	 * @return string
+	 */
+	public function getSessionKey(): string
+	{
+		return $this->sessionKey;
+	}
+
+	/**
+	 * @param string $sessionKey
+	 */
+	public function setSessionKey(string $sessionKey): void
+	{
+		$this->sessionKey = $sessionKey;
+	}
+
+	/**
+	 * @return string
+	 */
+	public function getIv(): string
+	{
+		return $this->iv;
+	}
+
+	/**
+	 * @param string $iv
+	 */
+	public function setIv(string $iv): void
+	{
+		$this->iv = $iv;
+	}
+
+	/**
+	 * @return string
+	 */
+	public function getEncryptedData(): string
+	{
+		return $this->encryptedData;
+	}
+
+	/**
+	 * @param string $encryptedData
+	 */
+	public function setEncryptedData(string $encryptedData): void
+	{
+		$this->encryptedData = $encryptedData;
+	}
+
+	/**
+	 * @return string
+	 */
+	public function getAppId(): string
+	{
+		return $this->appId;
+	}
+
+	/**
+	 * @param string $appId
+	 */
+	public function setAppId(string $appId): void
+	{
+		$this->appId = $appId;
+	}
+
+
+	/**
+	 * @param $asArray
+	 * @return array|mixed
+	 * @throws \Exception
+	 */
+	public function decode($asArray): object|array
+	{
+		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);
+		}
+		return $asArray ? get_object_vars($dataObj) : $dataObj;
+	}
+
+}