//验证URL
// @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 sEchoStr: 随机串，对应URL参数的echostr
// @param sReplyEchoStr: 解密之后的echostr，当return返回0时有效
// @return：成功0，失败返回对应的错误码
public WXBizMsgCryptErrorCode VerifyURL(string sMsgSignature, string sTimeStamp, string sNonce, string sEchoStr, ref string sReplyEchoStr)
{
WXBizMsgCryptErrorCode ret = 0;
if (m_sEncodingAESKey.Length != 43)
{
return(WXBizMsgCryptErrorCode.WXBizMsgCrypt_IllegalAesKey);
}
ret = VerifySignature(m_sToken, sTimeStamp, sNonce, sEchoStr, sMsgSignature);
if (0 != ret)
{
return(ret);
}
sReplyEchoStr = "";
string cpid = "";
try
{
sReplyEchoStr = Cryptography.AES_decrypt(sEchoStr, m_sEncodingAESKey, ref cpid); //m_sCorpID);
}
catch (Exception)
{
sReplyEchoStr = "";
return(WXBizMsgCryptErrorCode.WXBizMsgCrypt_DecryptAES_Error);
}
if (cpid != m_sAppID)
{
sReplyEchoStr = "";
return(WXBizMsgCryptErrorCode.WXBizMsgCrypt_ValidateAppid_Error);
}
return(0);
}
// 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);
}
//将企业号回复用户的消息加密打包
// @param sReplyMsg: 企业号待回复用户的消息，xml格式的字符串
// @param sTimeStamp: 时间戳，可以自己生成，也可以用URL参数的timestamp
// @param sNonce: 随机串，可以自己生成，也可以用URL参数的nonce
// @param sEncryptMsg: 加密后的可以直接回复用户的密文，包括msg_signature, timestamp, nonce, encrypt的xml格式的字符串,
// 当return返回0时有效
// return：成功0，失败返回对应的错误码
public WXBizMsgCryptErrorCode EncryptMsg(string sReplyMsg, string sTimeStamp, string sNonce, ref string sEncryptMsg)
{
if (m_sEncodingAESKey.Length != 43)
{
return(WXBizMsgCryptErrorCode.WXBizMsgCrypt_IllegalAesKey);
}
string raw = "";
try
{
raw = Cryptography.AES_encrypt(sReplyMsg, m_sEncodingAESKey, m_sAppID);
}
catch (Exception)
{
return(WXBizMsgCryptErrorCode.WXBizMsgCrypt_EncryptAES_Error);
}
string MsgSigature = "";
WXBizMsgCryptErrorCode ret = 0;
ret = GenarateSinature(m_sToken, sTimeStamp, sNonce, raw, ref MsgSigature);
if (0 != ret)
{
return(ret);
}
sEncryptMsg = "";
string EncryptLabelHead = "<Encrypt><![CDATA[";
string EncryptLabelTail = "]]></Encrypt>";
string MsgSigLabelHead = "<MsgSignature><![CDATA[";
string MsgSigLabelTail = "]]></MsgSignature>";
string TimeStampLabelHead = "<TimeStamp><![CDATA[";
string TimeStampLabelTail = "]]></TimeStamp>";
string NonceLabelHead = "<Nonce><![CDATA[";
string NonceLabelTail = "]]></Nonce>";
sEncryptMsg = sEncryptMsg + "<xml>" + EncryptLabelHead + raw + EncryptLabelTail;
sEncryptMsg = sEncryptMsg + MsgSigLabelHead + MsgSigature + MsgSigLabelTail;
sEncryptMsg = sEncryptMsg + TimeStampLabelHead + sTimeStamp + TimeStampLabelTail;
sEncryptMsg = sEncryptMsg + NonceLabelHead + sNonce + NonceLabelTail;
sEncryptMsg += "</xml>";
return(0);
}
//Verify Signature
private static WXBizMsgCryptErrorCode VerifySignature(string sToken, string sTimeStamp, string sNonce, string sMsgEncrypt, string sSigture)
{
string hash = "";
WXBizMsgCryptErrorCode ret = 0;
ret = GenarateSinature(sToken, sTimeStamp, sNonce, sMsgEncrypt, ref hash);
if (ret != 0)
{
return(ret);
}
//System.Console.WriteLine(hash);
if (hash == sSigture)
{
return(0);
}
else
{
return(WXBizMsgCryptErrorCode.WXBizMsgCrypt_ValidateSignature_Error);
}
}
