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数据加密标准(DES)的C#实现(4)
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/**//*
* 数据加密标准(DES)的C#实现(4)
*
* 采用自定义的密钥Key和初始化向量IV加密
*
* 夏春涛 Email:xChuntao@163.com
* Blog:http://bluesky521.cnblogs.com
* 运行环境:.net2.0 framework
*/
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/**//*
* 关于DES加密中的初始化向量IV:
* 对于给定的密钥 k,不使用初始化向量的简单块密码将同一个纯文本输入块加密为
* 同一个密码文本输出块。如果您的纯文本流中有重复块,则您的密码文本流中也会
* 有重复块。如果未经授权的用户知道了您的纯文本块结构的任何信息,他们就可以
* 利用该信息来解密已知的密码文本块,并有可能重新获得您的密钥。为了防止这个
* 问题,前一个块中的信息被混合到下一个块的加密过程中。这样一来,两个相同的
* 纯文本块的输出就变得不一样了。由于此技术使用前一个块加密下一个块,因此需
* 要初始化向量来加密数据的第一个块。
*/
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using System;
using System.Collections.Generic;
using System.Text;
using System.Security.Cryptography;
using System.IO;
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namespace DES_App4
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{
class Program
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{
static void Main(string[] args)
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{
string str_plain_text = "How are you?";//原文
Console.WriteLine("原文:" + str_plain_text);
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string KEY_64 = "a4G-8=Jk"; //必须是8个字符(64Bit)
string IV_64 = "JKbN=5[?"; //必须8个字符(64Bit)
Console.WriteLine("密钥:" + KEY_64);
Console.WriteLine("初始化向量:" + IV_64);
//----
string str_cypher_text = Encrypt(str_plain_text, KEY_64, IV_64);
Console.WriteLine("密文:" + str_cypher_text);
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Console.WriteLine("解密:" + Decrypt(str_cypher_text, KEY_64, IV_64) );
Console.WriteLine();
}
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static public string Encrypt(string PlainText, string KEY_64, string IV_64)
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{
byte[] byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(KEY_64);
byte[] byIV = System.Text.ASCIIEncoding.ASCII.GetBytes(IV_64);
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DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider();
int i = cryptoProvider.KeySize;
MemoryStream ms = new MemoryStream();
CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateEncryptor(byKey, byIV), CryptoStreamMode.Write);
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StreamWriter sw = new StreamWriter(cst);
sw.Write(PlainText);
sw.Flush();
cst.FlushFinalBlock();
sw.Flush();
return Convert.ToBase64String(ms.GetBuffer(), 0, (int)ms.Length);
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}
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static public string Decrypt(string CypherText, string KEY_64, string IV_64)
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{
byte[] byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(KEY_64);
byte[] byIV = System.Text.ASCIIEncoding.ASCII.GetBytes(IV_64);
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byte[] byEnc;
try
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{
byEnc = Convert.FromBase64String(CypherText);
}
catch
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{
return null;
}
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DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider();
MemoryStream ms = new MemoryStream(byEnc);
CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateDecryptor(byKey, byIV), CryptoStreamMode.Read);
StreamReader sr = new StreamReader(cst);
return sr.ReadToEnd();
}
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}
}
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源码附件:
/Files/bluesky521/DES_Hash_Demo.rar
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原文地址:https://www.cnblogs.com/SummerRain/p/1005582.html
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