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這篇文章主要介紹了微信開發(fā)之如何實(shí)現(xiàn)消息體簽名和加解密,具有一定借鑒價(jià)值,感興趣的朋友可以參考下,希望大家閱讀完這篇文章之后大有收獲,下面讓小編帶著大家一起了解一下。
代碼:
using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Security.Cryptography;using System.IO;using System.Net;namespace WxApi { public class Cryptography { public static UInt32 HostToNetworkOrder(UInt32 inval) { UInt32 outval = 0; for (int i = 0; i < 4; i++) outval = (outval << 8) + ((inval >> (i * 8)) & 255); return outval; } public static Int32 HostToNetworkOrder(Int32 inval) { Int32 outval = 0; for (int i = 0; i < 4; i++) outval = (outval << 8) + ((inval >> (i * 8)) & 255); return outval; } /// <summary> /// 解密方法 /// </summary> /// <param name="Input">密文</param> /// <param name="EncodingAESKey"></param> /// <returns></returns> /// public static string AES_decrypt(String Input, string EncodingAESKey, ref string appid) { byte[] Key; Key = Convert.FromBase64String(EncodingAESKey + "="); byte[] Iv = new byte[16]; Array.Copy(Key, Iv, 16); byte[] btmpMsg = AES_decrypt(Input, Iv, Key); int len = BitConverter.ToInt32(btmpMsg, 16); len = IPAddress.NetworkToHostOrder(len); byte[] bMsg = new byte[len]; byte[] bAppid = new byte[btmpMsg.Length - 20 - len]; Array.Copy(btmpMsg, 20, bMsg, 0, len); Array.Copy(btmpMsg, 20 + len, bAppid, 0, btmpMsg.Length - 20 - len); string oriMsg = Encoding.UTF8.GetString(bMsg); appid = Encoding.UTF8.GetString(bAppid); return oriMsg; } public static String AES_encrypt(String Input, string EncodingAESKey, string appid) { byte[] Key; Key = Convert.FromBase64String(EncodingAESKey + "="); byte[] Iv = new byte[16]; Array.Copy(Key, Iv, 16); string Randcode = CreateRandCode(16); byte[] bRand = Encoding.UTF8.GetBytes(Randcode); byte[] bAppid = Encoding.UTF8.GetBytes(appid); byte[] btmpMsg = Encoding.UTF8.GetBytes(Input); byte[] bMsgLen = BitConverter.GetBytes(HostToNetworkOrder(btmpMsg.Length)); byte[] bMsg = new byte[bRand.Length + bMsgLen.Length + bAppid.Length + btmpMsg.Length]; Array.Copy(bRand, bMsg, bRand.Length); Array.Copy(bMsgLen, 0, bMsg, bRand.Length, bMsgLen.Length); Array.Copy(btmpMsg, 0, bMsg, bRand.Length + bMsgLen.Length, btmpMsg.Length); Array.Copy(bAppid, 0, bMsg, bRand.Length + bMsgLen.Length + btmpMsg.Length, bAppid.Length); return AES_encrypt(bMsg, Iv, Key); } private static string CreateRandCode(int codeLen) { string codeSerial = "2,3,4,5,6,7,a,c,d,e,f,h,i,j,k,m,n,p,r,s,t,A,C,D,E,F,G,H,J,K,M,N,P,Q,R,S,U,V,W,X,Y,Z"; if (codeLen == 0) { codeLen = 16; } string[] arr = codeSerial.Split(','); string code = ""; int randValue = -1; Random rand = new Random(unchecked((int)DateTime.Now.Ticks)); for (int i = 0; i < codeLen; i++) { randValue = rand.Next(0, arr.Length - 1); code += arr[randValue]; } return code; } private static String AES_encrypt(String Input, byte[] Iv, byte[] Key) { var aes = new RijndaelManaged(); //秘鑰的大小,以位為單位 aes.KeySize = 256; //支持的塊大小 aes.BlockSize = 128; //填充模式 aes.Padding = PaddingMode.PKCS7; aes.Mode = CipherMode.CBC; aes.Key = Key; aes.IV = Iv; var encrypt = aes.CreateEncryptor(aes.Key, aes.IV); byte[] xBuff = null; using (var ms = new MemoryStream()) { using (var cs = new CryptoStream(ms, encrypt, CryptoStreamMode.Write)) { byte[] xXml = Encoding.UTF8.GetBytes(Input); cs.Write(xXml, 0, xXml.Length); } xBuff = ms.ToArray(); } String Output = Convert.ToBase64String(xBuff); return Output; } private static String AES_encrypt(byte[] Input, byte[] Iv, byte[] Key) { var aes = new RijndaelManaged(); //秘鑰的大小,以位為單位 aes.KeySize = 256; //支持的塊大小 aes.BlockSize = 128; //填充模式 //aes.Padding = PaddingMode.PKCS7; aes.Padding = PaddingMode.None; aes.Mode = CipherMode.CBC; aes.Key = Key; aes.IV = Iv; var encrypt = aes.CreateEncryptor(aes.Key, aes.IV); byte[] xBuff = null; #region 自己進(jìn)行PKCS7補(bǔ)位,用系統(tǒng)自己帶的不行 byte[] msg = new byte[Input.Length + 32 - Input.Length % 32]; Array.Copy(Input, msg, Input.Length); byte[] pad = KCS7Encoder(Input.Length); Array.Copy(pad, 0, msg, Input.Length, pad.Length); #endregion #region 注釋的也是一種方法,效果一樣 //ICryptoTransform transform = aes.CreateEncryptor(); //byte[] xBuff = transform.TransformFinalBlock(msg, 0, msg.Length); #endregion using (var ms = new MemoryStream()) { using (var cs = new CryptoStream(ms, encrypt, CryptoStreamMode.Write)) { cs.Write(msg, 0, msg.Length); } xBuff = ms.ToArray(); } String Output = Convert.ToBase64String(xBuff); return Output; } private static byte[] KCS7Encoder(int text_length) { int block_size = 32; // 計(jì)算需要填充的位數(shù) int amount_to_pad = block_size - (text_length % block_size); if (amount_to_pad == 0) { amount_to_pad = block_size; } // 獲得補(bǔ)位所用的字符 char pad_chr = chr(amount_to_pad); string tmp = ""; for (int index = 0; index < amount_to_pad; index++) { tmp += pad_chr; } return Encoding.UTF8.GetBytes(tmp); } /** * 將數(shù)字轉(zhuǎn)化成ASCII碼對(duì)應(yīng)的字符,用于對(duì)明文進(jìn)行補(bǔ)碼 * * @param a 需要轉(zhuǎn)化的數(shù)字 * @return 轉(zhuǎn)化得到的字符 */ static char chr(int a) { byte target = (byte)(a & 0xFF); return (char)target; } private static byte[] AES_decrypt(String Input, byte[] Iv, byte[] Key) { RijndaelManaged aes = new RijndaelManaged(); aes.KeySize = 256; aes.BlockSize = 128; aes.Mode = CipherMode.CBC; aes.Padding = PaddingMode.None; aes.Key = Key; aes.IV = Iv; var decrypt = aes.CreateDecryptor(aes.Key, aes.IV); byte[] xBuff = null; using (var ms = new MemoryStream()) { using (var cs = new CryptoStream(ms, decrypt, CryptoStreamMode.Write)) { byte[] xXml = Convert.FromBase64String(Input); byte[] msg = new byte[xXml.Length + 32 - xXml.Length % 32]; Array.Copy(xXml, msg, xXml.Length); cs.Write(xXml, 0, xXml.Length); } xBuff = decode2(ms.ToArray()); } return xBuff; } private static byte[] decode2(byte[] decrypted) { int pad = (int)decrypted[decrypted.Length - 1]; if (pad < 1 || pad > 32) { pad = 0; } byte[] res = new byte[decrypted.Length - pad]; Array.Copy(decrypted, 0, res, 0, decrypted.Length - pad); return res; } } }
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 : 簽名驗(yàn)證錯(cuò)誤//-40002 : xml解析失敗//-40003 : sha加密生成簽名失敗//-40004 : AESKey 非法//-40005 : appid 校驗(yàn)錯(cuò)誤//-40006 : AES 加密失敗//-40007 : AES 解密失敗//-40008 : 解密后得到的buffer非法//-40009 : base64加密異常//-40010 : base64解密異常namespace WxApi { public class MsgCrypt { string m_sToken; string m_sEncodingAESKey; string m_sAppID; enum WXBizMsgCryptErrorCode { WXBizMsgCrypt_OK = 0, WXBizMsgCrypt_ValidateSignature_Error = -40001, WXBizMsgCrypt_ParseXml_Error = -40002, WXBizMsgCrypt_ComputeSignature_Error = -40003, WXBizMsgCrypt_IllegalAesKey = -40004, WXBizMsgCrypt_ValidateAppid_Error = -40005, WXBizMsgCrypt_EncryptAES_Error = -40006, WXBizMsgCrypt_DecryptAES_Error = -40007, WXBizMsgCrypt_IllegalBuffer = -40008, WXBizMsgCrypt_EncodeBase64_Error = -40009, WXBizMsgCrypt_DecodeBase64_Error = -40010 }; //構(gòu)造函數(shù) // @param sToken: 公眾平臺(tái)上,開發(fā)者設(shè)置的Token // @param sEncodingAESKey: 公眾平臺(tái)上,開發(fā)者設(shè)置的EncodingAESKey // @param sAppID: 公眾帳號(hào)的appid public MsgCrypt(string sToken, string sEncodingAESKey, string sAppID) { m_sToken = sToken; m_sAppID = sAppID; m_sEncodingAESKey = sEncodingAESKey; } // 檢驗(yàn)消息的真實(shí)性,并且獲取解密后的明文 // @param sMsgSignature: 簽名串,對(duì)應(yīng)URL參數(shù)的msg_signature // @param sTimeStamp: 時(shí)間戳,對(duì)應(yīng)URL參數(shù)的timestamp // @param sNonce: 隨機(jī)串,對(duì)應(yīng)URL參數(shù)的nonce // @param sPostData: 密文,對(duì)應(yīng)POST請(qǐng)求的數(shù)據(jù) // @param sMsg: 解密后的原文,當(dāng)return返回0時(shí)有效 // @return: 成功0,失敗返回對(duì)應(yīng)的錯(cuò)誤碼 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) { return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_DecodeBase64_Error; } catch (Exception) { return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_DecryptAES_Error; } if (cpid != m_sAppID) return (int)WXBizMsgCryptErrorCode.WXBizMsgCrypt_ValidateAppid_Error; return 0; } //將企業(yè)號(hào)回復(fù)用戶的消息加密打包 // @param sReplyMsg: 企業(yè)號(hào)待回復(fù)用戶的消息,xml格式的字符串 // @param sTimeStamp: 時(shí)間戳,可以自己生成,也可以用URL參數(shù)的timestamp // @param sNonce: 隨機(jī)串,可以自己生成,也可以用URL參數(shù)的nonce // @param sEncryptMsg: 加密后的可以直接回復(fù)用戶的密文,包括msg_signature, timestamp, nonce, encrypt的xml格式的字符串, // 當(dāng)return返回0時(shí)有效 // return:成功0,失敗返回對(duì)應(yīng)的錯(cuò)誤碼 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_sAppID); } 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; //System.Console.WriteLine(hash); 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; } } }
在處理程序中,首先獲取到公眾平臺(tái)服務(wù)器發(fā)送過來的數(shù)據(jù),并轉(zhuǎn)成字符串。代碼如下
string postStr = ""; Stream s = VqiRequest.GetInputStream();//此方法是對(duì)System.Web.HttpContext.Current.Request.InputStream的封裝,可直接代碼 byte[] b = new byte[s.Length]; s.Read(b, 0, (int)s.Length); postStr = Encoding.UTF8.GetString(b);
然后再分別獲取url中的參數(shù):timestamp,nonce,msg_signature,encrypt_type。可以看到,在明文模式下是沒有encrypt_type參數(shù)的。如圖:
明文模式
兼容模式和安全模式
兼容模式和安全模式則加入了消息體的簽名與加密類型兩個(gè)參數(shù)。
由于在實(shí)際的運(yùn)營中,兼容模式不太可能使用,所以在此不做詳細(xì)介紹了。
接著上面的講。獲取到url中的參數(shù)后,判斷encrypt_type的值是否為aes,如果是則說明是使用的兼容模式或安全模式,此時(shí)則需調(diào)用解密相關(guān)的方法進(jìn)行解密。
if (encrypt_type == "aes") { requestXML.IsAes = true; requestXML.EncodingAESKey = aeskey; requestXML.token = token; requestXML.appid = appid; var ret = new MsgCrypt(token, aeskey, appid); int r = ret.DecryptMsg(msg_signature, timestamp, nonce, postStr, ref data); if (r!=0) { WxApi.Base.WriteBug("消息解密失敗"); return null; } }
否則則直接解析接收到的xml字符串。
下圖是接收到的密文:
解密之后的內(nèi)容如下:
此時(shí)就可以解析此xml了。
當(dāng)需要回復(fù)加密的請(qǐng)求時(shí),回復(fù)的內(nèi)容也是需要加密的,所以在回復(fù)前需要判斷此條接收到的消息是否加密,如果是加密的,則需要將需要回復(fù)的內(nèi)容加密后,再進(jìn)行回復(fù)?;貜?fù)消息的方法將在下一篇中具體講解,此篇只講解加密的過程。
處理代碼如下:
private static void Response(WeiXinRequest requestXML, string data) { if (requestXML.IsAes) { var wxcpt = new MsgCrypt(requestXML.token, requestXML.EncodingAESKey, requestXML.appid); wxcpt.EncryptMsg(data, Utils.ConvertDateTimeInt(DateTime.Now).ToString(), Utils.GetRamCode(), ref data); } Utils.ResponseWrite(data); }
將接收到的消息實(shí)體和需要回復(fù)的內(nèi)容xml傳遞過來,如果是加密的,則加密后再Response,否則直接Response。
感謝你能夠認(rèn)真閱讀完這篇文章,希望小編分享的“微信開發(fā)之如何實(shí)現(xiàn)消息體簽名和加解密”這篇文章對(duì)大家有幫助,同時(shí)也希望大家多多支持億速云,關(guān)注億速云行業(yè)資訊頻道,更多相關(guān)知識(shí)等著你來學(xué)習(xí)!
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