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system/decrypt_data.php

@@ -0,0 +1,41 @@
+<?php
+
+/**
+ * Created by PhpStorm.
+ * User: ayisun
+ * Date: 2016/10/2
+ * Time: 10:02
+ */
+class decrypt_data
+{
+
+    /**
+     * @param $encrypt_data
+     * @param $session_key
+     * @return bool|string
+     * 描述：解密数据
+     */
+    public function aes128cbc_Decrypt($encrypt_data, $session_key)
+    {
+        $aeskey = base64_decode($session_key);
+        $iv = $aeskey;
+        $encryptedData = base64_decode($encrypt_data);
+        $decrypted = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $aeskey, $encryptedData, MCRYPT_MODE_CBC, $iv);
+        return $this->stripPkcs7Padding($decrypted);
+    }
+
+    /**
+     * 对解密后的明文进行补位删除
+     * @param text 解密后的明文
+     * @return 删除填充补位后的明文
+     */
+    function stripPkcs7Padding($text)
+    {
+
+        $pad = ord(substr($text, -1));
+        if ($pad < 1 || $pad > 32) {
+            $pad = 0;
+        }
+        return substr($text, 0, (strlen($text) - $pad));
+    }
+}