C# 微信接口验证

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Xml;using System.Collections;//using System.Web;using System.Security.Cryptography;//-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 Tencent{ class WXBizMsgCrypt { string m_sToken; string m_sEncodingAESKey; string m_sReceiveId; 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: 企业微信后台，开发者设置的Token // @param sEncodingAESKey: 企业微信后台，开发者设置的EncodingAESKey // @param sReceiveId: 不同场景含义不同，详见文档说明 public WXBizMsgCrypt(string sToken, string sEncodingAESKey, string sReceiveId) { m_sToken = sToken; m_sReceiveId = sReceiveId; 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_sReceiveId); } catch (Exception) { sReplyEchoStr = ""; return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_DecryptAES_Error; } if (cpid != m_sReceiveId) { 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_sReceiveId) 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_sReceiveId); } 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; } }}