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using System;
using System.Collections.Generic;
using System.Text;
using System.Xml;
using System.Collections;
//using System.Web;
using System.Security.Cryptography;
using BP.Tools;
//-40001 签名验证错误
//-40002 : xml解析失败
//-40003 : sha加密生成签名失败
//-40004 : AESKey 非法
//-40005 : corpid 校验错误
//-40006 : AES 加密失败
//-40007 AES 解密失败
//-40008 解密后得到的buffer非法
//-40009 : base64加密异常
//-40010 : base64解密异常
namespace BP.GPM.WeiXin
{
public class WXBizMsgCrypt
{
string m_sToken;
string m_sEncodingAESKey;
string m_sCorpID;
enum WXBizMsgCryptErrorCode
{
WXBizMsgCrypt_OK = 0,
WXBizMsgCrypt_ValidateSignature_Error = -40001,
WXBizMsgCrypt_ParseXml_Error = -40002,
WXBizMsgCrypt_ComputeSignature_Error = -40003,
WXBizMsgCrypt_IllegalAesKey = -40004,
WXBizMsgCrypt_ValidateCorpid_Error = -40005,
WXBizMsgCrypt_EncryptAES_Error = -40006,
WXBizMsgCrypt_DecryptAES_Error = -40007,
WXBizMsgCrypt_IllegalBuffer = -40008,
WXBizMsgCrypt_EncodeBase64_Error = -40009,
WXBizMsgCrypt_DecodeBase64_Error = -40010
};
//构造函数
// @param sToken: 公众平台上开发者设置的Token
// @param sEncodingAESKey: 公众平台上开发者设置的EncodingAESKey
// @param sCorpID: 企业号的CorpID
public WXBizMsgCrypt(string sToken, string sEncodingAESKey, string sCorpID)
{
m_sToken = sToken;
m_sCorpID = sCorpID;
m_sEncodingAESKey = sEncodingAESKey;
}
//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 int VerifyURL(string sMsgSignature, string sTimeStamp, string sNonce, string sEchoStr, ref string sReplyEchoStr)
{
int ret = 0;
if (m_sEncodingAESKey.Length != 43)
{
return (int)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 (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_DecryptAES_Error;
}
if (cpid != m_sCorpID)
{
sReplyEchoStr = "";
return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_ValidateCorpid_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 int DecryptMsg(string sMsgSignature, string sTimeStamp, string sNonce, string sPostData, ref string sMsg)
{
if (m_sEncodingAESKey.Length != 43)
{
return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_IllegalAesKey;
}
XmlDocument doc = new XmlDocument();
XmlNode root;
string sEncryptMsg;
try
{
doc.LoadXml(sPostData);
root = doc.FirstChild;
sEncryptMsg = root["Encrypt"].InnerText;
}
catch (Exception)
{
return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_ParseXml_Error;
}
//verify signature
int 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)
{
sMsg = "";
return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_DecodeBase64_Error;
}
catch (Exception)
{
sMsg = "";
return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_DecryptAES_Error;
}
if (cpid != m_sCorpID)
return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_ValidateCorpid_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 int EncryptMsg(string sReplyMsg, string sTimeStamp, string sNonce, ref string sEncryptMsg)
{
if (m_sEncodingAESKey.Length != 43)
{
return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_IllegalAesKey;
}
string raw = "";
try
{
raw = Cryptography.AES_encrypt(sReplyMsg, m_sEncodingAESKey, m_sCorpID);
}
catch (Exception)
{
return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_EncryptAES_Error;
}
string MsgSigature = "";
int 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;
}
public class DictionarySort : System.Collections.IComparer
{
public int Compare(object oLeft, object oRight)
{
string sLeft = oLeft as string;
string sRight = oRight as string;
int iLeftLength = sLeft.Length;
int iRightLength = sRight.Length;
int index = 0;
while (index < iLeftLength && index < iRightLength)
{
if (sLeft[index] < sRight[index])
return -1;
else if (sLeft[index] > sRight[index])
return 1;
else
index++;
}
return iLeftLength - iRightLength;
}
}
//Verify Signature
private static int VerifySignature(string sToken, string sTimeStamp, string sNonce, string sMsgEncrypt, string sSigture)
{
string hash = "";
int ret = 0;
ret = GenarateSinature(sToken, sTimeStamp, sNonce, sMsgEncrypt, ref hash);
if (ret != 0)
return ret;
if (hash == sSigture)
return 0;
else
{
return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_ValidateSignature_Error;
}
}
public static int GenarateSinature(string sToken, string sTimeStamp, string sNonce, string sMsgEncrypt, ref string sMsgSignature)
{
ArrayList AL = new ArrayList();
AL.Add(sToken);
AL.Add(sTimeStamp);
AL.Add(sNonce);
AL.Add(sMsgEncrypt);
AL.Sort(new DictionarySort());
string raw = "";
for (int i = 0; i < AL.Count; ++i)
{
raw += AL[i];
}
SHA1 sha;
ASCIIEncoding enc;
string hash = "";
try
{
sha = new SHA1CryptoServiceProvider();
enc = new ASCIIEncoding();
byte[] dataToHash = enc.GetBytes(raw);
byte[] dataHashed = sha.ComputeHash(dataToHash);
hash = BitConverter.ToString(dataHashed).Replace("-", "");
hash = hash.ToLower();
}
catch (Exception)
{
return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_ComputeSignature_Error;
}
sMsgSignature = hash;
return 0;
}
}
}