| 发表于：2007-02-07 10:06:24 楼主 |
using system;
using system.data;
using system.configuration;
using system.collections;
using system.web;
using system.web.security;
using system.web.ui;
using system.web.ui.webcontrols;
using system.web.ui.webcontrols.webparts;
using system.web.ui.htmlcontrols;
using system.text;
using system.security.cryptography;
using system.io;
public partial class default2 : system.web.ui.page
{
private string secretkey1= "aa ";
private string secretkey2= "bb ";
protected void page_load（object sender, eventargs e)
{
this.label1.text = encrypt1（ "aa ");
}
/// <summary>
/// 一次加密
/// </summary>
/// <param name= "ptoencrypt "> 加密内容 </param>
/// <returns> </returns>
private string encrypt1（string ptoencrypt)
{
string encryptstring = " ";
try
{
descryptoserviceprovider des = new descryptoserviceprovider（);
byte[] inputbytearray = encoding.default.getbytes（ptoencrypt);
des.key = asciiencoding.ascii.getbytes（secretkey1);
des.iv = asciiencoding.ascii.getbytes（secretkey1);
memorystream ms = new memorystream（);
cryptostream cs = new cryptostream（ms, des.createencryptor（), cryptostreammode.write);
cs.write（inputbytearray, 0, inputbytearray.length);
cs.flushfinalblock（);
stringbuilder ret = new stringbuilder（);
foreach （byte b in ms.toarray（))
{
ret.appendformat（ "{0:x2} ", b);
}
encryptstring = encrypt2（ret.tostring（));
}
catch
{
encryptstring = "encryptfailing ";
}
return encryptstring;
}
/// <summary>
/// 二次加密
/// </summary>
/// <param name= "ptoencrypt "> 加密内容 </param>
/// <returns> </returns>
private string encrypt2（string ptoencrypt)
{
string encryptstring = " ";
try
{
descryptoserviceprovider des = new descryptoserviceprovider（);
byte[] inputbytearray = encoding.default.getbytes（ptoencrypt);
des.key = asciiencoding.ascii.getbytes（secretkey2);
des.iv = asciiencoding.ascii.getbytes（secretkey2);
memorystream ms = new memorystream（);
cryptostream cs = new cryptostream（ms, des.createencryptor（), cryptostreammode.write);
cs.write（inputbytearray, 0, inputbytearray.length);
cs.flushfinalblock（);
stringbuilder ret = new stringbuilder（);
foreach （byte b in ms.toarray（))
{
ret.appendformat（ "{0:x2} ", b);
}
encryptstring = ret.tostring（);
}
catch
{
encryptstring = "encryptfailing ";
}
return encryptstring;
}
/// <summary>
/// 一次解密
/// </summary>
/// <param name= "ptodecrypt "> 解密内容 </param>
/// <returns> </returns>
private string decrypt1（string ptodecrypt)
{
string encryptstring = " ";
memorystream ms = new memorystream（);
try
{
descryptoserviceprovider des = new descryptoserviceprovider（);
byte[] inputbytearray = new byte[ptodecrypt.length / 2];
for （int x = 0; x < ptodecrypt.length / 2; x++)
{
int i = （convert.toint32（ptodecrypt.substring（x * 2, 2), 16));
inputbytearray[x] = （byte)i;
}
des.key = asciiencoding.ascii.getbytes（secretkey2);
des.iv = asciiencoding.ascii.getbytes（secretkey2);
cryptostream cs = new cryptostream（ms, des.createdecryptor（), cryptostreammode.write);
cs.write（inputbytearray, 0, inputbytearray.length);
cs.flushfinalblock（);
stringbuilder ret = new stringbuilder（);
encryptstring = decrypt2（system.text.encoding.default.getstring（ms.toarray（)));
}
catch
{
encryptstring = "encryptfailing ";
}
return encryptstring;
}
/// <summary>
/// 二次解密
/// </summary>
/// <param name= "ptodecrypt "> 解密内容 </param>
/// <returns> </returns>
private string decrypt2（string ptodecrypt)
{
string encryptstring = " ";
memorystream ms = new memorystream（);
try
{
descryptoserviceprovider des = new descryptoserviceprovider（);
byte[] inputbytearray = new byte[ptodecrypt.length / 2];
for （int x = 0; x < ptodecrypt.length / 2; x++)
{
int i = （convert.toint32（ptodecrypt.substring（x * 2, 2), 16));
inputbytearray[x] = （byte)i;
}
des.key = asciiencoding.ascii.getbytes（secretkey1);
des.iv = asciiencoding.ascii.getbytes（secretkey1);
cryptostream cs = new cryptostream（ms, des.createdecryptor（), cryptostreammode.write);
cs.write（inputbytearray, 0, inputbytearray.length);
cs.flushfinalblock（);
stringbuilder ret = new stringbuilder（);
encryptstring = system.text.encoding.default.getstring（ms.toarray（));
}
catch
{
encryptstring = "encryptfailing ";
}
return encryptstring;
}
}
//问题
des.key = asciiencoding.ascii.getbytes（secretkey1);
des.iv = asciiencoding.ascii.getbytes（secretkey1);
这两句执行就出错,请问是什么原因?
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