106 lines
3.8 KiB
C#
106 lines
3.8 KiB
C#
using System;
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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.Security.Cryptography;
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using System.Text;
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using System.Threading.Tasks;
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namespace FAuth.Extensions.Decryptor
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{
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/// <summary>
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/// 加密帮助类
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/// </summary>
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public class EncryptyWorker
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{
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/// <summary>
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/// 补位填充方式
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/// </summary>
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public PaddingMode Padding { get; set; }
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/// <summary>
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/// 加密算法模式
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/// </summary>
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public CipherMode Cipher { get; set; }
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/// <summary>
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/// 初始化向量
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/// </summary>
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public byte[] IV { get; set; }
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/// <summary>
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/// 加密字符串获取Base64密文
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/// </summary>
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/// <param name="key">加密key</param>
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/// <param name="str">要加密的字符串</param>
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public string Encrypty(string key,string str) {
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if(key.Length < 8) {
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throw new Exception("加密用的key长度为8位");
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}
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byte[] bKey = Encoding.UTF8.GetBytes(key.Substring(0,8));
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byte[] bStr = Encoding.UTF8.GetBytes(str);
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var desc = createProvider();
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using(var mStream = new MemoryStream()) {
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using(var cStream = new CryptoStream(mStream,desc.CreateEncryptor(bKey,IV),CryptoStreamMode.Write)) {
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cStream.Write(bStr,0,bStr.Length);
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cStream.FlushFinalBlock();
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return Convert.ToBase64String(mStream.ToArray());
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}
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}
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}
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/// <summary>
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/// 从Base64密文解密，获取字符串
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/// </summary>
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/// <param name="key">加密键</param>
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/// <param name="str">密文</param>
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public string DesCrypty(string key,string str) {
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if(key.Length < 8) {
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throw new Exception("加密用的key长度为8位");
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}
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var bStr = Convert.FromBase64String(str);
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byte[] bKey = Encoding.UTF8.GetBytes(key.Substring(0,8));
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var desc = createProvider();
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using(var mStream = new MemoryStream()) {
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using(var cStream = new CryptoStream(mStream,desc.CreateDecryptor(bKey,IV),CryptoStreamMode.Write)) {
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cStream.Write(bStr,0,bStr.Length);
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cStream.FlushFinalBlock();
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return Encoding.UTF8.GetString(mStream.ToArray());
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}
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}
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}
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private DESCryptoServiceProvider createProvider() {
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var desc = new DESCryptoServiceProvider();
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desc.Padding = this.Padding;
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desc.Mode = this.Cipher;
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return desc;
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}
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private static EncryptyWorker Deshelper { get; set; }
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private EncryptyWorker() { }
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/// <summary>
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/// 重用模式获取默认加密帮助器
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/// </summary>
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public static EncryptyWorker GetHelper() {
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if(Deshelper == null) {
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byte[] IV = { 0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08 };
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Deshelper = GetHelper(PaddingMode.PKCS7,CipherMode.CBC,IV);
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}
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return Deshelper;
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}
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/// <summary>
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/// 生成新的加密帮助器
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/// </summary>
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/// <param name="padding">补位方式</param>
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/// <param name="cipher">加密算法模式</param>
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/// <param name="IV">初始化向量</param>
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public static EncryptyWorker GetHelper(PaddingMode padding,CipherMode cipher,byte[] IV) {
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return new EncryptyWorker {
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Cipher = cipher,
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IV = IV,
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Padding = padding,
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};
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}
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}
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}
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