using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;
using System.Xml;
namespace DemoApi
{
public sealed class EncryptHelper
{
private EncryptHelper() { }
/// <summary>
/// Md5加密
/// </summary>
/// <param name="text"></param>
/// <returns></returns>
public static string Md5Encrypt(string text)
{
//MD5加密
var md5 = MD5.Create();
var bs = md5.ComputeHash(Encoding.UTF8.GetBytes(text));
var sb = new StringBuilder();
foreach (byte b in bs)
{
sb.Append(b.ToString("x2"));
}
//所有字符转为大写
return sb.ToString().ToUpper();
}
/// <summary>
/// HMAC-SHA1加密算法
/// </summary>
/// <param name="str">加密字符串</param>
/// <returns></returns>
public static string Sha1Encrypt(string str)
{
var sha1 = SHA1.Create();
var hash = sha1.ComputeHash(Encoding.Default.GetBytes(str));
//return BitConverter.ToString(hash).Replace("-", "");
string byte2String = null;
for (int i = 0; i < hash.Length; i++)
{
byte2String += hash.ToString("x2");
}
return byte2String;
}
/// <summary>
/// AES加密
/// </summary>
/// <param name="text">加密字符</param>
/// <param name="encodingAESKey">加密的密码</param>
/// <param name="appid">appId</param>
/// <returns></returns>
public static string AESEncrypt(string text, string encodingAESKey, string appid)
{
if (string.IsNullOrEmpty(text))
{
return text;
}
byte[] key;
key = Convert.FromBase64String(encodingAESKey + "=");
byte[] iv = new byte[16];
Array.Copy(key, iv, 16);
#region 生成随机值
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";
string[] arr = codeSerial.Split(',');
string code = "";
int randValue = -1;
Random rand = new Random(unchecked((int)DateTime.Now.Ticks));
for (int i = 0; i < 16; i++)
{
randValue = rand.Next(0, arr.Length - 1);
code += arr[randValue];
}
#endregion
byte[] bRand = Encoding.UTF8.GetBytes(code);
byte[] bAppid = Encoding.UTF8.GetBytes(appid);
byte[] btmpMsg = Encoding.UTF8.GetBytes(text);
int outval = 0, inval = btmpMsg.Length;
for (int i = 0; i < 4; i++)
outval = (outval << 8) + ((inval >> (i * 8)) & 255);
byte[] bMsgLen = BitConverter.GetBytes(outval);
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);
var aes = new RijndaelManaged();
//秘钥的大小，以位为单位
aes.KeySize = 256;
//支持的块大小
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;
byte[] msg = new byte[bMsg.Length + 32 - bMsg.Length % 32];
Array.Copy(bMsg, msg, bMsg.Length);
#region 自己进行PKCS7补位，用系统自己带的不行，微信加密要使用这个
int block_size = 32;
// 计算需要填充的位数
int amount_to_pad = block_size - (bMsg.Length % block_size);
if (amount_to_pad == 0)
{
amount_to_pad = block_size;
}
// 获得补位所用的字符
char pad_chr = (char)(byte)(amount_to_pad & 0xFF);
string tmp = "";
for (int index = 0; index < amount_to_pad; index++)
{
tmp += pad_chr;
}
byte[] pad = Encoding.UTF8.GetBytes(tmp);
Array.Copy(pad, 0, msg, bMsg.Length, pad.Length);
using (var ms = new MemoryStream())
{
using (var cs = new CryptoStream(ms, encrypt, CryptoStreamMode.Write))
{
cs.Write(msg, 0, msg.Length);
}
xBuff = ms.ToArray();
}
#endregion
#region 注释的也是一种方法，效果一样，微信加密不能使用这个！！！！
//ICryptoTransform transform = aes.CreateEncryptor();
//xBuff = transform.TransformFinalBlock(msg, 0, msg.Length);
#endregion
string output = Convert.ToBase64String(xBuff);
return output;
}
/// <summary>
/// AES解密
/// </summary>
/// <param name="encryptText">密文</param>
/// <param name="encodingAESKey">秘钥</param>
/// <param name="appid"></param>
/// <returns></returns>
public static string AESDecrypt(string encryptText, string encodingAESKey, out string appid)
{
if (string.IsNullOrEmpty(encryptText))
{
appid = "";
return encryptText;
}
byte[] key;
key = Convert.FromBase64String(encodingAESKey + "=");
byte[] iv = new byte[16];
Array.Copy(key, iv, 16);
byte[] btmpMsg = null;
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);
using (var ms = new MemoryStream())
{
using (var cs = new CryptoStream(ms, decrypt, CryptoStreamMode.Write))
{
byte[] xXml = Convert.FromBase64String(encryptText);
byte[] msg = new byte[xXml.Length + 32 - xXml.Length % 32];
Array.Copy(xXml, msg, xXml.Length);
cs.Write(xXml, 0, xXml.Length);
}
var decrypted = ms.ToArray();
int pad = (int)decrypted[decrypted.Length - 1];
if (pad < 1 || pad > 32)
{
pad = 0;
}
btmpMsg = new byte[decrypted.Length - pad];
Array.Copy(decrypted, 0, btmpMsg, 0, decrypted.Length - pad);
}
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;
}
/// <summary>
/// AES解密
/// </summary>
/// <param name="encryptText">密文</param>
/// <param name="encodingAESKey">秘钥</param>
/// <param name="appid"></param>
/// <returns></returns>
public static string AESDecrypt(string encryptText, string encodingAESKey)
{
return AESDecrypt(encryptText, encodingAESKey, out _);
}
}
public class CharSort : IComparer
{
public int Compare(object left, object right)
{
string sLeft = left as string;
string sRight = right as string;
int leftLength = sLeft.Length;
int rightLength = sRight.Length;
int index = 0;
while (index < leftLength && index < rightLength)
{
if (sLeft[index] < sRight[index])
return -1;
else if (sLeft[index] > sRight[index])
return 1;
else
index++;
}
return leftLength - rightLength;
}
}
}
发表于 2019-11-4 15:19:00
