黄聪:C# DES 加密/解密类库,支持文件和中文/UNICODE字符,返回BASE64编码字符串

今天,看到网友咨询DES加密的事,就写了下面的类库,sharing 一下,欢迎多交流

using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Security;
using System.Security.Cryptography;

/*----------------------------------------------
* DES加密、解密类库,字符串加密结果使用BASE64编码返回,支持文件的加密和解密
* 作者: 三角猫/DeltaCat
* 网址:
http://www.zu14.cn
* 转载务必保留此信息
* ---------------------------------------------
*/

namespace ZU14
{
public sealed class DES
{
string iv = "1234的yzo";
string key = "123在yzo";

/// <summary>
/// DES加密偏移量,必须是>=8位长的字符串
/// </summary>
public string IV
{
get { return iv; }
set { iv = value; }
}

/// <summary>
/// DES加密的私钥,必须是8位长的字符串
/// </summary>
public string Key
{
get { return key; }
set { key = value; }
}

/// <summary>
/// 对字符串进行DES加密
/// </summary>
/// <param name="sourceString">待加密的字符串</param>
/// <returns>加密后的BASE64编码的字符串</returns>
public string Encrypt(string sourceString)
{
byte[] btKey = Encoding.Default.GetBytes(key);
byte[] btIV = Encoding.Default.GetBytes(iv);
DESCryptoServiceProvider des
= new DESCryptoServiceProvider();
using (MemoryStream ms = new MemoryStream())
{
byte[] inData = Encoding.Default.GetBytes(sourceString);
try
{
using (CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(btKey, btIV), CryptoStreamMode.Write))
{
cs.Write(inData,
0, inData.Length);
cs.FlushFinalBlock();
}

return Convert.ToBase64String(ms.ToArray());
}
catch
{
throw;
}
}
}

/// <summary>
/// 对DES加密后的字符串进行解密
/// </summary>
/// <param name="encryptedString">待解密的字符串</param>
/// <returns>解密后的字符串</returns>
public string Decrypt(string encryptedString)
{
byte[] btKey = Encoding.Default.GetBytes(key);
byte[] btIV = Encoding.Default.GetBytes(iv);
DESCryptoServiceProvider des
= new DESCryptoServiceProvider();

using (MemoryStream ms = new MemoryStream())
{
byte[] inData = Convert.FromBase64String(encryptedString);
try
{
using (CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(btKey, btIV), CryptoStreamMode.Write))
{
cs.Write(inData,
0, inData.Length);
cs.FlushFinalBlock();
}

return Encoding.Default.GetString(ms.ToArray());
}
catch
{
throw;
}
}
}

/// <summary>
/// 对文件内容进行DES加密
/// </summary>
/// <param name="sourceFile">待加密的文件绝对路径</param>
/// <param name="destFile">加密后的文件保存的绝对路径</param>
public void EncryptFile(string sourceFile, string destFile)
{
if (!File.Exists(sourceFile)) throw new FileNotFoundException("指定的文件路径不存在!", sourceFile);

byte[] btKey = Encoding.Default.GetBytes(key);
byte[] btIV = Encoding.Default.GetBytes(iv);
DESCryptoServiceProvider des
= new DESCryptoServiceProvider();
byte[] btFile = File.ReadAllBytes(sourceFile);

using (FileStream fs = new FileStream(destFile, FileMode.Create, FileAccess.Write))
{
try
{
using (CryptoStream cs = new CryptoStream(fs, des.CreateEncryptor(btKey, btIV), CryptoStreamMode.Write))
{
cs.Write(btFile,
0, btFile.Length);
cs.FlushFinalBlock();
}
}
catch
{
throw;
}
finally
{
fs.Close();
}
}
}

/// <summary>
/// 对文件内容进行DES加密,加密后覆盖掉原来的文件
/// </summary>
/// <param name="sourceFile">待加密的文件的绝对路径</param>
public void EncryptFile(string sourceFile)
{
EncryptFile(sourceFile, sourceFile);
}

/// <summary>
/// 对文件内容进行DES解密
/// </summary>
/// <param name="sourceFile">待解密的文件绝对路径</param>
/// <param name="destFile">解密后的文件保存的绝对路径</param>
public void DecryptFile(string sourceFile, string destFile)
{
if (!File.Exists(sourceFile)) throw new FileNotFoundException("指定的文件路径不存在!", sourceFile);

byte[] btKey = Encoding.Default.GetBytes(key);
byte[] btIV = Encoding.Default.GetBytes(iv);
DESCryptoServiceProvider des
= new DESCryptoServiceProvider();
byte[] btFile = File.ReadAllBytes(sourceFile);

using (FileStream fs = new FileStream(destFile, FileMode.Create, FileAccess.Write))
{
try
{
using (CryptoStream cs = new CryptoStream(fs, des.CreateDecryptor(btKey, btIV), CryptoStreamMode.Write))
{
cs.Write(btFile,
0, btFile.Length);
cs.FlushFinalBlock();
}
}
catch
{
throw;
}
finally
{
fs.Close();
}
}
}

/// <summary>
/// 对文件内容进行DES解密,加密后覆盖掉原来的文件
/// </summary>
/// <param name="sourceFile">待解密的文件的绝对路径</param>
public void DecryptFile(string sourceFile)
{
DecryptFile(sourceFile, sourceFile);
}
}
}

使用的例子

ZU14.DES des = new ZU14.DES();
des.IV
= "abcd哈哈笑";
des.Key
= "必须八位";

string es = des.Encrypt("");
Console.WriteLine(es);
Console.Write(des.Decrypt(es));

des.EncryptFile(
@"d:\a.txt", @"d:\b.txt");
des.DecryptFile(
@"d:\b.txt");

Console.ReadKey(
true);

OK了。

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原文地址:https://www.cnblogs.com/huangcong/p/1697230.html