using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using System.Net;
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using System.Security.Cryptography;
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using System.Text;
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using System.Threading.Tasks;
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using System.Xml;
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namespace Api.MessageReceive.Service
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{
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internal class Cryptography
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{
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public static UInt32 HostToNetworkOrder(UInt32 inval)
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{
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UInt32 outval = 0;
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for (int i = 0; i < 4; i++)
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outval = (outval << 8) + ((inval >> (i * 8)) & 255);
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return outval;
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}
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public static Int32 HostToNetworkOrder(Int32 inval)
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{
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Int32 outval = 0;
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for (int i = 0; i < 4; i++)
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outval = (outval << 8) + ((inval >> (i * 8)) & 255);
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return outval;
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}
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/// <summary>
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///
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/// </summary>
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/// <param name="input"></param>
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/// <param name="encodingAESKey"></param>
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/// <param name="corpid"></param>
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/// <returns></returns>
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public static string AES_decrypt(String input, string encodingAESKey, ref string corpid)
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{
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byte[] key;
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key = Convert.FromBase64String(encodingAESKey + "=");
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byte[] iv = new byte[16];
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Array.Copy(key, iv, 16);
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byte[] btmpMsg = AES_decrypt(input, iv, key);
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int len = BitConverter.ToInt32(btmpMsg, 16);
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len = IPAddress.NetworkToHostOrder(len);
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byte[] bMsg = new byte[len];
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byte[] bCorpid = new byte[btmpMsg.Length - 20 - len];
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Array.Copy(btmpMsg, 20, bMsg, 0, len);
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Array.Copy(btmpMsg, 20 + len, bCorpid, 0, btmpMsg.Length - 20 - len);
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string oriMsg = Encoding.UTF8.GetString(bMsg);
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corpid = Encoding.UTF8.GetString(bCorpid);
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return oriMsg;
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}
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public static String AES_encrypt(String input, string encodingAESKey, string corpid)
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{
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byte[] key;
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key = Convert.FromBase64String(encodingAESKey + "=");
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byte[] iv = new byte[16];
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Array.Copy(key, iv, 16);
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string randcode = CreateRandCode(16);
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byte[] bRand = Encoding.UTF8.GetBytes(randcode);
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byte[] bCorpid = Encoding.UTF8.GetBytes(corpid);
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byte[] btmpMsg = Encoding.UTF8.GetBytes(input);
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byte[] bMsgLen = BitConverter.GetBytes(HostToNetworkOrder(btmpMsg.Length));
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byte[] bMsg = new byte[bRand.Length + bMsgLen.Length + bCorpid.Length + btmpMsg.Length];
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Array.Copy(bRand, bMsg, bRand.Length);
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Array.Copy(bMsgLen, 0, bMsg, bRand.Length, bMsgLen.Length);
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Array.Copy(btmpMsg, 0, bMsg, bRand.Length + bMsgLen.Length, btmpMsg.Length);
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Array.Copy(bCorpid, 0, bMsg, bRand.Length + bMsgLen.Length + btmpMsg.Length, bCorpid.Length);
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return AES_encrypt(bMsg, iv, key);
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}
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private static string CreateRandCode(int codeLen)
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{
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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";
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if (codeLen == 0)
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{
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codeLen = 16;
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}
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string[] arr = codeSerial.Split(',');
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string code = "";
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int randValue = -1;
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Random rand = new Random(unchecked((int)DateTime.Now.Ticks));
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for (int i = 0; i < codeLen; i++)
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{
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randValue = rand.Next(0, arr.Length - 1);
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code += arr[randValue];
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}
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return code;
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}
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private static String AES_encrypt(String input, byte[] iv, byte[] key)
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{
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var aes = new RijndaelManaged();
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//秘钥的大小，以位为单位
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aes.KeySize = 256;
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//支持的块大小
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aes.BlockSize = 128;
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//填充模式
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aes.Padding = PaddingMode.PKCS7;
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aes.Mode = CipherMode.CBC;
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aes.Key = key;
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aes.IV = iv;
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var encrypt = aes.CreateEncryptor(aes.Key, aes.IV);
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byte[] xBuff = null;
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using (var ms = new MemoryStream())
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{
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using (var cs = new CryptoStream(ms, encrypt, CryptoStreamMode.Write))
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{
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byte[] xXml = Encoding.UTF8.GetBytes(input);
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cs.Write(xXml, 0, xXml.Length);
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}
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xBuff = ms.ToArray();
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}
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String output = Convert.ToBase64String(xBuff);
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return output;
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}
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private static String AES_encrypt(byte[] input, byte[] iv, byte[] key)
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{
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var aes = new RijndaelManaged();
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//秘钥的大小，以位为单位
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aes.KeySize = 256;
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//支持的块大小
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aes.BlockSize = 128;
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//填充模式
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//aes.Padding = PaddingMode.PKCS7;
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aes.Padding = PaddingMode.None;
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aes.Mode = CipherMode.CBC;
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aes.Key = key;
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aes.IV = iv;
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var encrypt = aes.CreateEncryptor(aes.Key, aes.IV);
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byte[] xBuff = null;
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#region 自己进行PKCS7补位，用系统自己带的不行
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byte[] msg = new byte[input.Length + 32 - input.Length % 32];
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Array.Copy(input, msg, input.Length);
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byte[] pad = KCS7Encoder(input.Length);
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Array.Copy(pad, 0, msg, input.Length, pad.Length);
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#endregion 自己进行PKCS7补位，用系统自己带的不行
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#region 注释的也是一种方法，效果一样
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//ICryptoTransform transform = aes.CreateEncryptor();
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//byte[] xBuff = transform.TransformFinalBlock(msg, 0, msg.Length);
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#endregion 注释的也是一种方法，效果一样
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using (var ms = new MemoryStream())
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{
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using (var cs = new CryptoStream(ms, encrypt, CryptoStreamMode.Write))
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{
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cs.Write(msg, 0, msg.Length);
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}
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xBuff = ms.ToArray();
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}
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String output = Convert.ToBase64String(xBuff);
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return output;
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}
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private static byte[] KCS7Encoder(int text_length)
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{
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int block_size = 32;
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// 计算需要填充的位数
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int amount_to_pad = block_size - (text_length % block_size);
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if (amount_to_pad == 0)
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{
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amount_to_pad = block_size;
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}
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// 获得补位所用的字符
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char pad_chr = Chr(amount_to_pad);
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string tmp = "";
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for (int index = 0; index < amount_to_pad; index++)
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{
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tmp += pad_chr;
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}
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return Encoding.UTF8.GetBytes(tmp);
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}
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/**
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* 将数字转化成ASCII码对应的字符，用于对明文进行补码
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*
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* @param a 需要转化的数字
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* @return 转化得到的字符
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*/
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private static char Chr(int a)
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{
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byte target = (byte)(a & 0xFF);
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return (char)target;
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}
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private static byte[] AES_decrypt(String input, byte[] iv, byte[] key)
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{
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RijndaelManaged aes = new RijndaelManaged();
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aes.KeySize = 256;
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aes.BlockSize = 128;
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aes.Mode = CipherMode.CBC;
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aes.Padding = PaddingMode.None;
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aes.Key = key;
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aes.IV = iv;
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var decrypt = aes.CreateDecryptor(aes.Key, aes.IV);
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byte[] xBuff = null;
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using (var ms = new MemoryStream())
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{
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using (var cs = new CryptoStream(ms, decrypt, CryptoStreamMode.Write))
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{
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byte[] xXml = Convert.FromBase64String(input);
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byte[] msg = new byte[xXml.Length + 32 - xXml.Length % 32];
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Array.Copy(xXml, msg, xXml.Length);
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cs.Write(xXml, 0, xXml.Length);
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}
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xBuff = Decode2(ms.ToArray());
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}
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return xBuff;
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}
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private static byte[] Decode2(byte[] decrypted)
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{
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int pad = (int)decrypted[decrypted.Length - 1];
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if (pad < 1 || pad > 32)
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{
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pad = 0;
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}
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byte[] res = new byte[decrypted.Length - pad];
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Array.Copy(decrypted, 0, res, 0, decrypted.Length - pad);
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return res;
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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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public class WXBizMsgCrypt
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{
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private string _sToken;
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private string _sEncodingAESKey;
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private string _m_sAppID;
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private 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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/// <summary>
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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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/// </summary>
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/// <param name="sToken"></param>
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/// <param name="sEncodingAESKey"></param>
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/// <param name="sReceiveId"></param>
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public WXBizMsgCrypt(string sToken, string sEncodingAESKey, string m_sAppID)
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{
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_sToken = sToken;
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_m_sAppID = m_sAppID;
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_sEncodingAESKey = sEncodingAESKey;
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}
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/// <summary>
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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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/// </summary>
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/// <param name="sMsgSignature"></param>
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/// <param name="sTimeStamp"></param>
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/// <param name="sNonce"></param>
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/// <param name="sEchoStr"></param>
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/// <param name="sReplyEchoStr"></param>
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/// <returns></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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try
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{
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int ret = 0;
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if (_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(_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, _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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}
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catch (Exception)
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{
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return -1;
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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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/// @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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/// </summary>
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/// <param name="sMsgSignature"></param>
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/// <param name="sTimeStamp"></param>
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/// <param name="sNonce"></param>
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/// <param name="sPostData"></param>
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/// <param name="sMsg"></param>
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/// <returns></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 (_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(_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, _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 != _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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/// <summary>
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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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/// </summary>
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/// <param name="sReplyMsg"></param>
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/// <param name="sTimeStamp"></param>
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/// <param name="sNonce"></param>
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/// <param name="sEncryptMsg"></param>
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/// <returns></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 (_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, _sEncodingAESKey, _m_sAppID);
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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(_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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///
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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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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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