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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Xml;
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using System.Collections;
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//using System.Web;
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using System.Security.Cryptography;
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//-40001 ： 签名验证错误
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//-40002 : xml解析失败
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//-40003 : sha加密生成签名失败
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//-40004 : AESKey 非法
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//-40005 : corpid 校验错误
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//-40006 : AES 加密失败
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//-40007 ： AES 解密失败
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//-40008 ： 解密后得到的buffer非法
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//-40009 : base64加密异常
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//-40010 : base64解密异常
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namespace Tencent
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{
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/// <summary>
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/// 腾讯提供的类库（无需改动）
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/// </summary>
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public class WXBizMsgCrypt
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{
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string m_sToken;
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string m_sEncodingAESKey;
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string m_sReceiveId;
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enum WXBizMsgCryptErrorCode
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{
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WXBizMsgCrypt_OK = 0,
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WXBizMsgCrypt_ValidateSignature_Error = -40001,
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WXBizMsgCrypt_ParseXml_Error = -40002,
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WXBizMsgCrypt_ComputeSignature_Error = -40003,
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WXBizMsgCrypt_IllegalAesKey = -40004,
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WXBizMsgCrypt_ValidateCorpid_Error = -40005,
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WXBizMsgCrypt_EncryptAES_Error = -40006,
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WXBizMsgCrypt_DecryptAES_Error = -40007,
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WXBizMsgCrypt_IllegalBuffer = -40008,
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WXBizMsgCrypt_EncodeBase64_Error = -40009,
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WXBizMsgCrypt_DecodeBase64_Error = -40010
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};
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//构造函数
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// @param sToken: 企业微信后台，开发者设置的Token
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// @param sEncodingAESKey: 企业微信后台，开发者设置的EncodingAESKey
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// @param sReceiveId: 不同场景含义不同，详见文档说明
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public WXBizMsgCrypt(string sToken, string sEncodingAESKey, string sReceiveId)
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{
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m_sToken = sToken;
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m_sReceiveId = sReceiveId;
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m_sEncodingAESKey = sEncodingAESKey;
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}
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//验证URL
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// @param sMsgSignature: 签名串，对应URL参数的msg_signature
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// @param sTimeStamp: 时间戳，对应URL参数的timestamp
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// @param sNonce: 随机串，对应URL参数的nonce
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// @param sEchoStr: 随机串，对应URL参数的echostr
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// @param sReplyEchoStr: 解密之后的echostr，当return返回0时有效
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// @return：成功0，失败返回对应的错误码
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public int VerifyURL(string sMsgSignature, string sTimeStamp, string sNonce, string sEchoStr, ref string sReplyEchoStr)
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{
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int ret = 0;
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if (m_sEncodingAESKey.Length!=43)
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{
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return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_IllegalAesKey;
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}
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ret = VerifySignature(m_sToken, sTimeStamp, sNonce, sEchoStr, sMsgSignature);
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if (0 != ret)
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{
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return ret;
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}
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sReplyEchoStr = "";
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string cpid = "";
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try
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{
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sReplyEchoStr = Cryptography.AES_decrypt(sEchoStr, m_sEncodingAESKey, ref cpid); //m_sReceiveId);
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}
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catch (Exception)
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{
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sReplyEchoStr = "";
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return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_DecryptAES_Error;
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}
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if (cpid != m_sReceiveId)
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{
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sReplyEchoStr = "";
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return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_ValidateCorpid_Error;
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}
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return 0;
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}
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// 检验消息的真实性，并且获取解密后的明文
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// @param sMsgSignature: 签名串，对应URL参数的msg_signature
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// @param sTimeStamp: 时间戳，对应URL参数的timestamp
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// @param sNonce: 随机串，对应URL参数的nonce
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// @param sPostData: 密文，对应POST请求的数据
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// @param sMsg: 解密后的原文，当return返回0时有效
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// @return: 成功0，失败返回对应的错误码
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public int DecryptMsg(string sMsgSignature, string sTimeStamp, string sNonce, string sPostData, ref string sMsg)
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{
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if (m_sEncodingAESKey.Length!=43)
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{
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return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_IllegalAesKey;
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}
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XmlDocument doc = new XmlDocument();
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XmlNode root;
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string sEncryptMsg;
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try
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{
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doc.LoadXml(sPostData);
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root = doc.FirstChild;
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sEncryptMsg = root["Encrypt"].InnerText;
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}
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catch (Exception)
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{
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return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_ParseXml_Error;
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}
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//verify signature
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int ret = 0;
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ret = VerifySignature(m_sToken, sTimeStamp, sNonce, sEncryptMsg, sMsgSignature);
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if (ret != 0)
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return ret;
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//decrypt
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string cpid = "";
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try
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{
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sMsg = Cryptography.AES_decrypt(sEncryptMsg, m_sEncodingAESKey, ref cpid);
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}
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catch (FormatException)
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{
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sMsg = "";
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return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_DecodeBase64_Error;
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}
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catch (Exception)
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{
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sMsg = "";
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return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_DecryptAES_Error;
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}
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if (cpid != m_sReceiveId)
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return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_ValidateCorpid_Error;
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return 0;
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}
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//将企业号回复用户的消息加密打包
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// @param sReplyMsg: 企业号待回复用户的消息，xml格式的字符串
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// @param sTimeStamp: 时间戳，可以自己生成，也可以用URL参数的timestamp
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// @param sNonce: 随机串，可以自己生成，也可以用URL参数的nonce
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// @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,
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// 当return返回0时有效
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// return：成功0，失败返回对应的错误码
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public int EncryptMsg(string sReplyMsg, string sTimeStamp, string sNonce, ref string sEncryptMsg)
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{
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if (m_sEncodingAESKey.Length!=43)
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{
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return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_IllegalAesKey;
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}
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string raw = "";
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try
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{
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raw = Cryptography.AES_encrypt(sReplyMsg, m_sEncodingAESKey, m_sReceiveId);
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}
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catch (Exception)
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{
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return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_EncryptAES_Error;
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}
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string MsgSigature = "";
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int ret = 0;
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ret = GenarateSinature(m_sToken, sTimeStamp, sNonce, raw, ref MsgSigature);
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if (0 != ret)
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return ret;
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sEncryptMsg = "";
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string EncryptLabelHead = "<Encrypt><![CDATA[";
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string EncryptLabelTail = "]]></Encrypt>";
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string MsgSigLabelHead = "<MsgSignature><![CDATA[";
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string MsgSigLabelTail = "]]></MsgSignature>";
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string TimeStampLabelHead = "<TimeStamp><![CDATA[";
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string TimeStampLabelTail = "]]></TimeStamp>";
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string NonceLabelHead = "<Nonce><![CDATA[";
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string NonceLabelTail = "]]></Nonce>";
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sEncryptMsg = sEncryptMsg + "<xml>" + EncryptLabelHead + raw + EncryptLabelTail;
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sEncryptMsg = sEncryptMsg + MsgSigLabelHead + MsgSigature + MsgSigLabelTail;
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sEncryptMsg = sEncryptMsg + TimeStampLabelHead + sTimeStamp + TimeStampLabelTail;
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sEncryptMsg = sEncryptMsg + NonceLabelHead + sNonce + NonceLabelTail;
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sEncryptMsg += "</xml>";
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return 0;
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}
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public class DictionarySort : System.Collections.IComparer
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{
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public int Compare(object oLeft, object oRight)
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{
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string sLeft = oLeft as string;
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string sRight = oRight as string;
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int iLeftLength = sLeft.Length;
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int iRightLength = sRight.Length;
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int index = 0;
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while (index < iLeftLength && index < iRightLength)
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{
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if (sLeft[index] < sRight[index])
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return -1;
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else if (sLeft[index] > sRight[index])
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return 1;
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else
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index++;
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}
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return iLeftLength - iRightLength;
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}
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}
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//Verify Signature
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private static int VerifySignature(string sToken, string sTimeStamp, string sNonce, string sMsgEncrypt, string sSigture)
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{
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string hash = "";
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int ret = 0;
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ret = GenarateSinature(sToken, sTimeStamp, sNonce, sMsgEncrypt, ref hash);
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if (ret != 0)
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return ret;
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if (hash == sSigture)
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return 0;
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else
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{
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return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_ValidateSignature_Error;
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}
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}
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public static int GenarateSinature(string sToken, string sTimeStamp, string sNonce, string sMsgEncrypt ,ref string sMsgSignature)
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{
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ArrayList AL = new ArrayList();
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AL.Add(sToken);
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AL.Add(sTimeStamp);
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AL.Add(sNonce);
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AL.Add(sMsgEncrypt);
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AL.Sort(new DictionarySort());
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string raw = "";
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for (int i = 0; i < AL.Count; ++i)
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{
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raw += AL[i];
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}
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SHA1 sha;
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ASCIIEncoding enc;
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string hash = "";
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try
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{
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sha = new SHA1CryptoServiceProvider();
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enc = new ASCIIEncoding();
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byte[] dataToHash = enc.GetBytes(raw);
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byte[] dataHashed = sha.ComputeHash(dataToHash);
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hash = BitConverter.ToString(dataHashed).Replace("-", "");
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hash = hash.ToLower();
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}
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catch (Exception)
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{
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return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_ComputeSignature_Error;
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}
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sMsgSignature = hash;
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return 0;
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}
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}
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}
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