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266 lines
8.1 KiB
266 lines
8.1 KiB
using System;
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using System.Collections;
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using System.Security.Cryptography;
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using System.Text;
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using System.Xml;
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namespace learun.wechat
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{
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/// <summary>
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/// 版 本 EasyCode EC管理后台
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/// Copyright (c) 2019-present EC管理有限公司
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/// 创建人：tobin
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/// 日 期：2019.11.06
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/// 描 述：微信消息加密
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/// </summary>
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public partial class WXBizMsgCrypt
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{
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private readonly string m_sToken;
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private readonly string m_sEncodingAESKey;
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private readonly string m_sCorpID;
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/// <summary>
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/// 构造函数
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/// </summary>
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/// <param name="sToken">公众平台上，开发者设置的Token</param>
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/// <param name="sEncodingAESKey">公众平台上，开发者设置的EncodingAESKey</param>
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/// <param name="sCorpID">企业号的CorpID</param>
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public WXBizMsgCrypt(string sToken, string sEncodingAESKey, string sCorpID)
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{
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m_sToken = sToken;
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m_sCorpID = sCorpID;
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m_sEncodingAESKey = sEncodingAESKey;
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}
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/// <summary>
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/// 验证URL
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/// </summary>
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/// <param name="sMsgSignature">签名串，对应URL参数的msg_signature</param>
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/// <param name="sTimeStamp">时间戳，对应URL参数的timestamp</param>
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/// <param name="sNonce">随机串，对应URL参数的nonce</param>
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/// <param name="sEchoStr">随机串，对应URL参数的echostr</param>
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/// <param name="sReplyEchoStr">解密之后的echostr，当return返回0时有效</param>
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/// <returns>成功0，失败返回对应的错误码</returns>
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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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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_sCorpID);
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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_sCorpID)
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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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/// <summary>
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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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/// </summary>
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/// <param name="sMsgSignature">签名串，对应URL参数的msg_signature</param>
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/// <param name="sTimeStamp">时间戳，对应URL参数的timestamp</param>
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/// <param name="sNonce">随机串，对应URL参数的nonce</param>
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/// <param name="sPostData">密文，对应POST请求的数据</param>
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/// <param name="sMsg">解密后的原文，当return返回0时有效</param>
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/// <returns>成功0，失败返回对应的错误码</returns>
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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_sCorpID)
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return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_ValidateCorpid_Error;
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return 0;
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}
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/// <summary>
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/// 将企业号回复用户的消息加密打包
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/// </summary>
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/// <param name="sReplyMsg">企业号待回复用户的消息，xml格式的字符串</param>
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/// <param name="sTimeStamp">时间戳，可以自己生成，也可以用URL参数的timestamp</param>
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/// <param name="sNonce">随机串，可以自己生成，也可以用URL参数的nonce</param>
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/// <param name="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</param>
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/// <returns>成功0，失败返回对应的错误码</returns>
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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_sCorpID);
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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 = 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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/// <summary>
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/// 字典排序
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/// </summary>
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public class DictionarySort : System.Collections.IComparer
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{
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/// <summary>
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///
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/// </summary>
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/// <param name="oLeft"></param>
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/// <param name="oRight"></param>
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/// <returns></returns>
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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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/// <summary>
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///
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/// </summary>
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/// <param name="sToken"></param>
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/// <param name="sTimeStamp"></param>
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/// <param name="sNonce"></param>
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/// <param name="sMsgEncrypt"></param>
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/// <param name="sMsgSignature"></param>
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/// <returns></returns>
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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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{
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sToken,
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sTimeStamp,
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sNonce,
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sMsgEncrypt
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};
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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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