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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.Security.Cryptography;
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using System.IO;
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using System.Net;
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namespace Tencent
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{
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public 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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/// 解密方法
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/// </summary>
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/// <param name="Input">密文</param>
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/// <param name="EncodingAESKey"></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
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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
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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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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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}
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