找来的一个文件加密/解密算法，为什么解密出来的文件少了几个字节？
public static void test()
{
FileStream fin=new FileStream("input.txt",FileMode.Open,FileAccess.Read);
FileStream fout=new FileStream("output.txt",FileMode.OpenOrCreate,FileAccess.Write);
//创建加密类
DES des = new DESCryptoServiceProvider();
des.GenerateKey(); //获取随机产生的Key,和 IV
des.GenerateIV();
byte[] keys=des.Key;
byte[] ivs=des.IV;
long leng=fin.Length; //获取文件的长度
long temp=0; //临时变量
byte[] buffer=new byte[400]; //用于存储文件内容于缓存
CryptoStream cStream=new CryptoStream(fout,des.CreateEncryptor(keys,ivs),CryptoStreamMode.Write); //创建加密流并写入到"output.txt"文件
while(temp<leng)
{
int wLeng=fin.Read(buffer,0,400); //写入缓冲
cStream.Write(buffer,0,wLeng); //写入文件
temp=temp+wLeng;
Console.WriteLine("加密成功");
Console.ReadLine();
}
cStream.Close();
fout.Close();
fin.Close();
FileStream fin1=new FileStream("output.txt",FileMode.Open,FileAccess.Read);
FileStream fout1=new FileStream("解密.txt",FileMode.OpenOrCreate,FileAccess.Write);
//DES des1 = new DESCryptoServiceProvider();
//des1.GenerateKey(); //获取随机产生的Key,和 IV
//des1.GenerateIV();
//byte[] keys1=des1.Key;
//byte[] ivs1=des1.IV;
long leng1=fin1.Length; //获取文件的长度
long temp1=0; //临时变量
byte[] buffer1=new byte[400]; //用于存储文件内容于缓存
CryptoStream cStream1=new CryptoStream(fout1,des.CreateDecryptor(keys,ivs),CryptoStreamMode.Write); //创建加密流并写入到"output.txt"文件
while(temp1<leng1)
{
int wLeng1=fin1.Read(buffer1,0,400); //写入缓冲
cStream1.Write(buffer1,0,wLeng1); //写入文件
temp1=temp1+wLeng1;
Console.WriteLine("解密成功");
Console.ReadLine();
}
cStream.Close();
fout.Close();
fin.Close();
}
问题点数：50、回复次数：12Top
1 楼bingzhihan（冰之寒）回复于 2004-09-04 00:22:18 得分 10
会不会加密的太长，要睡觉了，实在看不下去了：）帮你顶吧Top
2 楼kpken（）回复于 2004-09-04 10:00:19 得分 0
加密1M的xml文件，少了大概4个字节吧，加密10多个byte的文件也少了4个字节。Top
3 楼coollzh（良子）回复于 2004-09-04 11:14:12 得分 10
看看有没有编码的问题Top
4 楼kpken（）回复于 2004-09-04 12:30:11 得分 0
我看过另外一个算法，中间用到了Encode，不过不是很懂Top
5 楼kpken（）回复于 2004-09-04 20:21:31 得分 0
upTop
6 楼happyno7（夕丁）回复于 2004-09-04 22:10:24 得分 10
会不会是少了结束符？
看上去代码没有问题
Top
7 楼kpken（）回复于 2004-09-04 23:48:44 得分 0
大家可以试试代码Top
8 楼kpken（）回复于 2004-09-06 10:29:07 得分 0
大家还有什么好算法介绍一下Top
9 楼khpcg（欢乐英雄）回复于 2004-09-06 14:51:47 得分 10
using System.IO;
using System.Text;
namespace WebADESCSDN
{
/// <summary>
/// DESCSDN2 的摘要说明。
/// </summary>
public class DESCSDN2
{
public DESCSDN2()
{
//
// TODO: 在此处添加构造函数逻辑
//
}
//加密字符串
public static string DesEncrypt(string strText)
{
try
{
byte[] byKey =new byte[8]{0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF};
byte[] IV =new byte[8]{0x23, 0x45, 0x67, 0x89, 0x0A, 0xBC, 0xDE, 0xF1};
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
byte[] inputByteArray = System.Text.Encoding.UTF8.GetBytes(strText);
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(byKey, IV), CryptoStreamMode.Write) ;
cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock();
return Convert.ToBase64String(ms.ToArray());
}
catch(System.Exception error)
{
return "error:" +error.Message+"\r";
}
}
public static string DesDecrypt(string strText)
{
try
{
byte[] byKey =new byte[] {0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF};
byte[] IV =new byte[]{0x23, 0x45, 0x67, 0x89, 0x0A, 0xBC, 0xDE, 0xF1};
byte[] inputByteArray = new Byte[strText.Length];
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
inputByteArray = Convert.FromBase64String(strText);
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(byKey, IV), CryptoStreamMode.Write);
cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock();
System.Text.Encoding encoding = new System.Text.UTF8Encoding();
return encoding.GetString(ms.ToArray());
}
catch(System.Exception error)
{
return "error:"+error.Message+"\r";
}
}
}
}
Top
10 楼khpcg（欢乐英雄）回复于 2004-09-06 14:53:25 得分 10
using System;
using System.Security.Cryptography;
using System.Text;
class RSACSPSample
{
static void Main()
{
try
{
//Create a UnicodeEncoder to convert between byte array and string.
UnicodeEncoding ByteConverter = new UnicodeEncoding();
//Create byte arrays to hold original, encrypted, and decrypted data.
byte[] dataToEncrypt = ByteConverter.GetBytes("Data to 中国人 Encrypt");
byte[] encryptedData;
byte[] decryptedData;
//Create a new instance of RSACryptoServiceProvider to generate
//public and private key data.
RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
//Pass the data to ENCRYPT, the public key information
//(using RSACryptoServiceProvider.ExportParameters(false),
//and a boolean flag specifying no OAEP padding.
encryptedData = RSAEncrypt(dataToEncrypt,RSA.ExportParameters(false), false);
//Pass the data to DECRYPT, the private key information
//(using RSACryptoServiceProvider.ExportParameters(true),
//and a boolean flag specifying no OAEP padding.
decryptedData = RSADecrypt(encryptedData,RSA.ExportParameters(true), false);
//Display the decrypted plaintext to the console.
for(long i=0;i<5000000;i++)
{
Console.WriteLine("Decrypted plaintext: {0}", ByteConverter.GetString(decryptedData));
}
}
catch(ArgumentNullException)
{
//Catch this exception in case the encryption did
//not succeed.
Console.WriteLine("Encryption failed.");
}
}
static public byte[] RSAEncrypt(byte[] DataToEncrypt, RSAParameters RSAKeyInfo, bool DoOAEPPadding)
{
try
{
//Create a new instance of RSACryptoServiceProvider.
RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
//Import the RSA Key information. This only needs
//toinclude the public key information.
RSA.ImportParameters(RSAKeyInfo);
//Encrypt the passed byte array and specify OAEP padding.
//OAEP padding is only available on Microsoft Windows XP or
//later.
return RSA.Encrypt(DataToEncrypt, DoOAEPPadding);
}
//Catch and display a CryptographicException
//to the console.
catch(CryptographicException e)
{
Console.WriteLine(e.Message);
return null;
}
}
static public byte[] RSADecrypt(byte[] DataToDecrypt, RSAParameters RSAKeyInfo,bool DoOAEPPadding)
{
try
{
//Create a new instance of RSACryptoServiceProvider.
RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
//Import the RSA Key information. This needs
//to include the private key information.
RSA.ImportParameters(RSAKeyInfo);
//Decrypt the passed byte array and specify OAEP padding.
//OAEP padding is only available on Microsoft Windows XP or
//later.
return RSA.Decrypt(DataToDecrypt, DoOAEPPadding);
}
//Catch and display a CryptographicException
//to the console.
catch(CryptographicException e)
{
Console.WriteLine(e.ToString());
return null;
}
}
}
/*try
{
//Create a new RSACryptoServiceProvider object.
RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
//Export the key information to an RSAParameters object.
//Pass false to export the public key information or pass
//true to export public and private key information.
RSAParameters RSAParams = RSA.ExportParameters(false);
}
catch(CryptographicException e)
{
//Catch this exception in case the encryption did
//not succeed.
Console.WriteLine(e.Message);
} */
Top
11 楼kpken（）回复于 2004-09-06 21:01:28 得分 0
你这个算法能够适应比较大（10M以内）的文本文件吗？Top
12 楼kpken（）回复于 2004-09-06 23:54:21 得分 0
换了一个算法，可以了。
public static void EncryptFile(string sInputFilename,string sOutputFilename, string sKey)
{
FileStream fsInput = new FileStream(sInputFilename,
FileMode.Open,
FileAccess.Read);
FileStream fsEncrypted = new FileStream(sOutputFilename,
FileMode.Create,
FileAccess.Write);
DESCryptoServiceProvider DES = new DESCryptoServiceProvider();
DES.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
DES.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
ICryptoTransform desencrypt = DES.CreateEncryptor();
CryptoStream cryptostream = new CryptoStream(fsEncrypted,
desencrypt,
CryptoStreamMode.Write);
byte[] bytearrayinput = new byte[fsInput.Length];
fsInput.Read(bytearrayinput, 0, bytearrayinput.Length);
cryptostream.Write(bytearrayinput, 0, bytearrayinput.Length);
cryptostream.Close();
fsInput.Close();
fsEncrypted.Close();
}
public static void DecryptFile(string sInputFilename, string sOutputFilename,string sKey)
{
DESCryptoServiceProvider DES = new DESCryptoServiceProvider();
//A 64 bit key and IV is required for this provider.
//Set secret key For DES algorithm.
DES.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
//Set initialization vector.
DES.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
//Create a file stream to read the encrypted file back.
FileStream fsread = new FileStream(sInputFilename,
FileMode.Open,
FileAccess.Read);
//Create a DES decryptor from the DES instance.
ICryptoTransform desdecrypt = DES.CreateDecryptor();
//Create crypto stream set to read and do a
//DES decryption transform on incoming bytes.
CryptoStream cryptostreamDecr = new CryptoStream(fsread,
desdecrypt,
CryptoStreamMode.Read);
//Print the contents of the decrypted file.
StreamWriter fsDecrypted = new StreamWriter(sOutputFilename);
fsDecrypted.Write(new StreamReader(cryptostreamDecr).ReadToEnd());
fsDecrypted.Flush();
fsDecrypted.Close();
}
Top
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