private string ToXml(FrameDLRObject obj)
{
XmlDocument doc = ComFunc.GetSafeXmlInstance();
XmlElement root = doc.CreateElement("xml");
doc.AppendChild(root);
foreach (var k in obj.Keys)
{
ToXmlElem(doc, root, k, obj.GetValue(k));
}
return(doc.InnerXml);
}
// 检验消息的真实性，并且获取解密后的明文
// @param sMsgSignature: 签名串，对应URL参数的msg_signature
// @param sTimeStamp: 时间戳，对应URL参数的timestamp
// @param sNonce: 随机串，对应URL参数的nonce
// @param sPostData: 密文，对应POST请求的数据
// @param sMsg: 解密后的原文，当return返回0时有效
// @return: 成功0，失败返回对应的错误码
public WXBizMsgCryptErrorCode DecryptMsg(string sMsgSignature, string sTimeStamp, string sNonce, string sPostData, ref string sMsg)
{
if (m_sEncodingAESKey.Length != 43)
{
return(WXBizMsgCryptErrorCode.WXBizMsgCrypt_IllegalAesKey);
}
XmlDocument doc = ComFunc.GetSafeXmlInstance();
XmlNode root;
string sEncryptMsg;
try
{
doc.LoadXml(sPostData);
root = doc.FirstChild;
sEncryptMsg = root["Encrypt"].InnerText;
}
catch (Exception)
{
return(WXBizMsgCryptErrorCode.WXBizMsgCrypt_ParseXml_Error);
}
//verify signature
WXBizMsgCryptErrorCode ret = 0;
ret = VerifySignature(m_sToken, sTimeStamp, sNonce, sEncryptMsg, sMsgSignature);
if (ret != 0)
{
return(ret);
}
//decrypt
string cpid = "";
try
{
sMsg = Cryptography.AES_decrypt(sEncryptMsg, m_sEncodingAESKey, ref cpid);
}
catch (FormatException)
{
return(WXBizMsgCryptErrorCode.WXBizMsgCrypt_DecodeBase64_Error);
}
catch (Exception)
{
return(WXBizMsgCryptErrorCode.WXBizMsgCrypt_DecryptAES_Error);
}
if (cpid != m_sAppID)
{
return(WXBizMsgCryptErrorCode.WXBizMsgCrypt_ValidateAppid_Error);
}
return(0);
}