常用编码工具类,支持base64,md5,des,crc32-阿里云开发者社区

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常用编码工具类,支持base64,md5,des,crc32

简介:

常用编码工具类,支持base64,md5,des,crc32
支持从文件到文件,从字符串到字符串的方式操作
以下是源码
None.gifusing System;
None.gifusing System.IO;
None.gifusing System.Security;
None.gifusing System.Security.Cryptography;
None.gifusing System.Runtime.InteropServices;
None.gifusing System.Text;
None.gif
ExpandedBlockStart.gifContractedBlock.gifnamespace YNEC.Services.Encrypt dot.gif{
ExpandedSubBlockStart.gifContractedSubBlock.gif/**//// <summary>
InBlock.gif
/// CRC 效验
InBlock.gif
/// 快速检测算法
ExpandedSubBlockEnd.gif
/// </summary>

ExpandedSubBlockStart.gifContractedSubBlock.gifpublic class CRC32dot.gif{
InBlock.gif
InBlock.gifprotected ulong[] crc32Table;
InBlock.gif
ExpandedSubBlockStart.gifContractedSubBlock.gif/**//// <summary>
InBlock.gif
/// 构造:初始化效验表
ExpandedSubBlockEnd.gif
/// </summary>

ExpandedSubBlockStart.gifContractedSubBlock.gifpublic CRC32() dot.gif{
InBlock.gifconst ulong ulPolynomial = 0xEDB88320;
InBlock.gifulong dwCrc;
InBlock.gif crc32Table = new ulong[256];
InBlock.gifint i,j;
ExpandedSubBlockStart.gifContractedSubBlock.giffor(i = 0; i < 256; i++) dot.gif{
InBlock.gif dwCrc = (ulong)i;
ExpandedSubBlockStart.gifContractedSubBlock.giffor(j = 8; j > 0; j--) dot.gif{
InBlock.gifif((dwCrc & 1)==1)
InBlock.gif dwCrc = (dwCrc >> 1) ^ ulPolynomial;
InBlock.gifelse
InBlock.gif dwCrc >>= 1;
ExpandedSubBlockEnd.gif }

InBlock.gif crc32Table[i] = dwCrc;
ExpandedSubBlockEnd.gif }

ExpandedSubBlockEnd.gif }

InBlock.gif
ExpandedSubBlockStart.gifContractedSubBlock.gif/**//// <summary>
InBlock.gif
/// 字节数组效验
InBlock.gif
/// </summary>
InBlock.gif
/// <param name="buffer">ref 字节数组</param>
ExpandedSubBlockEnd.gif
/// <returns></returns>

ExpandedSubBlockStart.gifContractedSubBlock.gifpublic ulong ByteCRC(ref byte[] buffer) dot.gif{
InBlock.gifulong ulCRC = 0xffffffff;
InBlock.gifulong len;
InBlock.gif len = (ulong)buffer.Length;
ExpandedSubBlockStart.gifContractedSubBlock.giffor (ulong buffptr=0; buffptr < len; buffptr++) dot.gif{
InBlock.gifulong tabPtr = ulCRC & 0xFF;
InBlock.gif tabPtr = tabPtr ^ buffer[buffptr];
InBlock.gif ulCRC = ulCRC >> 8;
InBlock.gif ulCRC = ulCRC ^ crc32Table[tabPtr];
ExpandedSubBlockEnd.gif }

InBlock.gifreturn ulCRC ^ 0xffffffff;
ExpandedSubBlockEnd.gif }

InBlock.gif
InBlock.gif
ExpandedSubBlockStart.gifContractedSubBlock.gif/**//// <summary>
InBlock.gif
/// 字符串效验
InBlock.gif
/// </summary>
InBlock.gif
/// <param name="sInputString">字符串</param>
ExpandedSubBlockEnd.gif
/// <returns></returns>

ExpandedSubBlockStart.gifContractedSubBlock.gifpublic ulong StringCRC(string sInputString)dot.gif{
InBlock.gifbyte[] buffer = Encoding.Default.GetBytes(sInputString);
InBlock.gifreturn ByteCRC(ref buffer);
ExpandedSubBlockEnd.gif }

InBlock.gif
ExpandedSubBlockStart.gifContractedSubBlock.gif/**//// <summary>
InBlock.gif
/// 文件效验
InBlock.gif
/// </summary>
InBlock.gif
/// <param name="sInputFilename">输入文件</param>
ExpandedSubBlockEnd.gif
/// <returns></returns>

ExpandedSubBlockStart.gifContractedSubBlock.gifpublic ulong FileCRC(string sInputFilename)dot.gif{
InBlock.gif FileStream inFile = new System.IO.FileStream(sInputFilename, System.IO.FileMode.Open, System.IO.FileAccess.Read);
InBlock.gifbyte[] bInput = new byte[inFile.Length];
InBlock.gif inFile.Read(bInput,0,bInput.Length);
InBlock.gif inFile.Close();
InBlock.gif
InBlock.gifreturn ByteCRC(ref bInput);
ExpandedSubBlockEnd.gif }

InBlock.gif
ExpandedSubBlockEnd.gif }

ExpandedSubBlockStart.gifContractedSubBlock.gif/**//// <summary>
InBlock.gif
/// MD5 无逆向编码
InBlock.gif
/// 获取唯一特征串,可用于密码加密
InBlock.gif
/// (无法还原)
ExpandedSubBlockEnd.gif
/// </summary>

ExpandedSubBlockStart.gifContractedSubBlock.gifpublic class MD5 dot.gif{
InBlock.gif
ExpandedSubBlockStart.gifContractedSubBlock.gifpublic MD5()dot.gif{
ExpandedSubBlockEnd.gif }

InBlock.gif
ExpandedSubBlockStart.gifContractedSubBlock.gif/**//// <summary>
InBlock.gif
/// 获取字符串的特征串
InBlock.gif
/// </summary>
InBlock.gif
/// <param name="sInputString">输入文本</param>
ExpandedSubBlockEnd.gif
/// <returns></returns>

ExpandedSubBlockStart.gifContractedSubBlock.gifpublic string HashString(string sInputString)dot.gif{
InBlock.gif System.Security.Cryptography.MD5 md5 = System.Security.Cryptography.MD5.Create();
InBlock.gifstring encoded = BitConverter.ToString(md5.ComputeHash(Encoding.Default.GetBytes(sInputString))).Replace("-","");
InBlock.gifreturn encoded;
ExpandedSubBlockEnd.gif }

InBlock.gif
ExpandedSubBlockStart.gifContractedSubBlock.gif/**//// <summary>
InBlock.gif
/// 获取文件的特征串
InBlock.gif
/// </summary>
InBlock.gif
/// <param name="sInputFilename">输入文件</param>
ExpandedSubBlockEnd.gif
/// <returns></returns>

ExpandedSubBlockStart.gifContractedSubBlock.gifpublic string HashFile(string sInputFilename)dot.gif{
InBlock.gif System.Security.Cryptography.MD5 md5 = System.Security.Cryptography.MD5.Create();
InBlock.gif FileStream inFile = new System.IO.FileStream(sInputFilename, System.IO.FileMode.Open, System.IO.FileAccess.Read);
InBlock.gifbyte[] bInput = new byte[inFile.Length];
InBlock.gif inFile.Read(bInput,0,bInput.Length);
InBlock.gif inFile.Close();
InBlock.gif
InBlock.gifstring encoded = BitConverter.ToString(md5.ComputeHash(bInput)).Replace("-","");
InBlock.gifreturn encoded;
ExpandedSubBlockEnd.gif }

InBlock.gif
ExpandedSubBlockEnd.gif }

InBlock.gif
ExpandedSubBlockStart.gifContractedSubBlock.gif/**//// <summary>
InBlock.gif
/// Base64 UUEncoded 编码
InBlock.gif
/// 将二进制编码为ASCII文本,用于网络传输
InBlock.gif
/// (可还原)
ExpandedSubBlockEnd.gif
/// </summary>

ExpandedSubBlockStart.gifContractedSubBlock.gifpublic class BASE64dot.gif{
InBlock.gif
ExpandedSubBlockStart.gifContractedSubBlock.gifpublic BASE64()dot.gif{
ExpandedSubBlockEnd.gif }

InBlock.gif
ExpandedSubBlockStart.gifContractedSubBlock.gif/**//// <summary>
InBlock.gif
/// 解码字符串
InBlock.gif
/// </summary>
InBlock.gif
/// <param name="sInputString">输入文本</param>
ExpandedSubBlockEnd.gif
/// <returns></returns>

ExpandedSubBlockStart.gifContractedSubBlock.gifpublic string DecryptString(string sInputString)dot.gif{
InBlock.gifchar[] sInput = sInputString.ToCharArray();
ExpandedSubBlockStart.gifContractedSubBlock.giftrydot.gif{
InBlock.gifbyte[] bOutput = System.Convert.FromBase64String(sInputString);
InBlock.gifreturn Encoding.Default.GetString(bOutput);
ExpandedSubBlockEnd.gif }

ExpandedSubBlockStart.gifContractedSubBlock.gifcatch ( System.ArgumentNullException ) dot.gif{
InBlock.gif//base 64 字符数组为null
InBlock.gif
return "";
ExpandedSubBlockEnd.gif }

ExpandedSubBlockStart.gifContractedSubBlock.gifcatch ( System.FormatException ) dot.gif{
InBlock.gif//长度错误,无法整除4
InBlock.gif
return "";
ExpandedSubBlockEnd.gif }

ExpandedSubBlockEnd.gif }

InBlock.gif
ExpandedSubBlockStart.gifContractedSubBlock.gif/**//// <summary>
InBlock.gif
/// 编码字符串
InBlock.gif
/// </summary>
InBlock.gif
/// <param name="sInputString">输入文本</param>
ExpandedSubBlockEnd.gif
/// <returns></returns>

ExpandedSubBlockStart.gifContractedSubBlock.gifpublic string EncryptString(string sInputString)dot.gif{
InBlock.gifbyte[] bInput = Encoding.Default.GetBytes(sInputString);
ExpandedSubBlockStart.gifContractedSubBlock.giftry dot.gif{
InBlock.gifreturn System.Convert.ToBase64String(bInput,0,bInput.Length);
ExpandedSubBlockEnd.gif }

ExpandedSubBlockStart.gifContractedSubBlock.gifcatch (System.ArgumentNullException) dot.gif{
InBlock.gif//二进制数组为NULL.
InBlock.gif
return "";
ExpandedSubBlockEnd.gif }

ExpandedSubBlockStart.gifContractedSubBlock.gifcatch (System.ArgumentOutOfRangeException) dot.gif{
InBlock.gif//长度不够
InBlock.gif
return "";
ExpandedSubBlockEnd.gif }

ExpandedSubBlockEnd.gif }

InBlock.gif
ExpandedSubBlockStart.gifContractedSubBlock.gif/**//// <summary>
InBlock.gif
/// 解码文件
InBlock.gif
/// </summary>
InBlock.gif
/// <param name="sInputFilename">输入文件</param>
ExpandedSubBlockEnd.gif
/// <param name="sOutputFilename">输出文件</param>

ExpandedSubBlockStart.gifContractedSubBlock.gifpublic void DecryptFile(string sInputFilename,string sOutputFilename) dot.gif{
InBlock.gif System.IO.StreamReader inFile;
InBlock.gifchar[] base64CharArray;
InBlock.gif
ExpandedSubBlockStart.gifContractedSubBlock.giftry dot.gif{
InBlock.gif inFile = new System.IO.StreamReader(sInputFilename,
InBlock.gif System.Text.Encoding.ASCII);
InBlock.gif base64CharArray = new char[inFile.BaseStream.Length];
InBlock.gif inFile.Read(base64CharArray, 0, (int)inFile.BaseStream.Length);
InBlock.gif inFile.Close();
ExpandedSubBlockEnd.gif }

ExpandedSubBlockStart.gifContractedSubBlock.gifcatch dot.gif{//(System.Exception exp) {
InBlock.gif
return;
ExpandedSubBlockEnd.gif }

InBlock.gif
InBlock.gif// 转换Base64 UUEncoded为二进制输出
InBlock.gif
byte[] binaryData;
ExpandedSubBlockStart.gifContractedSubBlock.giftry dot.gif{
InBlock.gif binaryData =
InBlock.gif System.Convert.FromBase64CharArray(base64CharArray,
InBlock.gif 0,
InBlock.gif base64CharArray.Length);
ExpandedSubBlockEnd.gif }

ExpandedSubBlockStart.gifContractedSubBlock.gifcatch ( System.ArgumentNullException ) dot.gif{
InBlock.gif//base 64 字符数组为null
InBlock.gif
return;
ExpandedSubBlockEnd.gif }

ExpandedSubBlockStart.gifContractedSubBlock.gifcatch ( System.FormatException ) dot.gif{
InBlock.gif//长度错误,无法整除4
InBlock.gif
return;
ExpandedSubBlockEnd.gif }

InBlock.gif
InBlock.gif// 写输出数据
InBlock.gif
System.IO.FileStream outFile;
ExpandedSubBlockStart.gifContractedSubBlock.giftry dot.gif{
InBlock.gif outFile = new System.IO.FileStream(sOutputFilename,
InBlock.gif System.IO.FileMode.Create,
InBlock.gif System.IO.FileAccess.Write);
InBlock.gif outFile.Write(binaryData, 0, binaryData.Length);
InBlock.gif outFile.Close();
ExpandedSubBlockEnd.gif }

ExpandedSubBlockStart.gifContractedSubBlock.gifcatchdot.gif{// (System.Exception exp) {
InBlock.gif
//流错误
ExpandedSubBlockEnd.gif
}

InBlock.gif
ExpandedSubBlockEnd.gif }

InBlock.gif
ExpandedSubBlockStart.gifContractedSubBlock.gif/**//// <summary>
InBlock.gif
/// 编码文件
InBlock.gif
/// </summary>
InBlock.gif
/// <param name="sInputFilename">输入文件</param>
ExpandedSubBlockEnd.gif
/// <param name="sOutputFilename">输出文件</param>

ExpandedSubBlockStart.gifContractedSubBlock.gifpublic void EncryptFile(string sInputFilename,string sOutputFilename)dot.gif{
InBlock.gif
InBlock.gif System.IO.FileStream inFile;
InBlock.gifbyte[] binaryData;
InBlock.gif
ExpandedSubBlockStart.gifContractedSubBlock.giftry dot.gif{
InBlock.gif inFile = new System.IO.FileStream(sInputFilename,
InBlock.gif System.IO.FileMode.Open,
InBlock.gif System.IO.FileAccess.Read);
InBlock.gif binaryData = new Byte[inFile.Length];
InBlock.giflong bytesRead = inFile.Read(binaryData, 0,
InBlock.gif (int) inFile.Length);
InBlock.gif inFile.Close();
ExpandedSubBlockEnd.gif }

ExpandedSubBlockStart.gifContractedSubBlock.gifcatch dot.gif{ //(System.Exception exp) {
InBlock.gif
return;
ExpandedSubBlockEnd.gif }

InBlock.gif
InBlock.gif// 转换二进制输入为Base64 UUEncoded输出
InBlock.gif
// 每3个字节在源数据里作为4个字节
InBlock.gif
long arrayLength = (long) ((4.0d/3.0d) * binaryData.Length);
InBlock.gif
InBlock.gif// 如果无法整除4
ExpandedSubBlockStart.gifContractedSubBlock.gif
if (arrayLength % 4 != 0) dot.gif{
InBlock.gif arrayLength += 4 - arrayLength % 4;
ExpandedSubBlockEnd.gif }

InBlock.gif
InBlock.gifchar[] base64CharArray = new char[arrayLength];
ExpandedSubBlockStart.gifContractedSubBlock.giftry dot.gif{
InBlock.gif System.Convert.ToBase64CharArray(binaryData,
InBlock.gif 0,
InBlock.gif binaryData.Length,
InBlock.gif base64CharArray,
InBlock.gif 0);
ExpandedSubBlockEnd.gif }

ExpandedSubBlockStart.gifContractedSubBlock.gifcatch (System.ArgumentNullException) dot.gif{
InBlock.gif//二进制数组为NULL.
InBlock.gif
return;
ExpandedSubBlockEnd.gif }

ExpandedSubBlockStart.gifContractedSubBlock.gifcatch (System.ArgumentOutOfRangeException) dot.gif{
InBlock.gif//长度不够
InBlock.gif
return;
ExpandedSubBlockEnd.gif }

InBlock.gif
InBlock.gif// 写UUEncoded数据到文件内
InBlock.gif
System.IO.StreamWriter outFile;
ExpandedSubBlockStart.gifContractedSubBlock.giftry dot.gif{
InBlock.gif outFile = new System.IO.StreamWriter(sOutputFilename,
InBlock.giffalse,
InBlock.gif System.Text.Encoding.ASCII);
InBlock.gif outFile.Write(base64CharArray);
InBlock.gif outFile.Close();
ExpandedSubBlockEnd.gif }

ExpandedSubBlockStart.gifContractedSubBlock.gifcatchdot.gif{// (System.Exception exp) {
InBlock.gif
//文件流出错
ExpandedSubBlockEnd.gif
}

InBlock.gif
InBlock.gif
ExpandedSubBlockEnd.gif }

ExpandedSubBlockEnd.gif }

ExpandedSubBlockStart.gifContractedSubBlock.gif/**//// <summary>
InBlock.gif
/// DES 加密
InBlock.gif
/// 支持Key(钥匙)加密变化
InBlock.gif
/// 支持还原
InBlock.gif
///
InBlock.gif
/// 演示操作:
InBlock.gif
/// // 64位,8个字节
InBlock.gif
/// string sSecretKey;
InBlock.gif
///
InBlock.gif
/// // 获取Key
InBlock.gif
/// sSecretKey = GenerateKey();
InBlock.gif
///
InBlock.gif
/// // 托管
InBlock.gif
/// GCHandle gch = GCHandle.Alloc( sSecretKey,GCHandleType.Pinned );
InBlock.gif
///
InBlock.gif
/// // 加密文件
InBlock.gif
/// EncryptFile(@"C:\MyData.txt",
InBlock.gif
/// @"C:\Encrypted.txt",
InBlock.gif
/// sSecretKey);
InBlock.gif
///
InBlock.gif
/// // 解密文件
InBlock.gif
/// DecryptFile(@"C:\Encrypted.txt",
InBlock.gif
/// @"C:\Decrypted.txt",
InBlock.gif
/// sSecretKey);
InBlock.gif
///
InBlock.gif
/// // 释放托管内容
InBlock.gif
/// ZeroMemory(gch.AddrOfPinnedObject(), sSecretKey.Length * 2);
InBlock.gif
/// gch.Free();
ExpandedSubBlockEnd.gif
/// </summary>

ExpandedSubBlockStart.gifContractedSubBlock.gifpublic class DES dot.gif{
InBlock.gif [DllImport("KERNEL32.DLL", EntryPoint="RtlZeroMemory")]
InBlock.gifpublic static extern bool ZeroMemory(IntPtr Destination, int Length);
InBlock.gif
ExpandedSubBlockStart.gifContractedSubBlock.gifpublic DES() dot.gif{
InBlock.gif//
InBlock.gif
// TODO: 在此处添加构造函数逻辑
InBlock.gif
//
ExpandedSubBlockEnd.gif
}

InBlock.gif
ExpandedSubBlockStart.gifContractedSubBlock.gif/**//// <summary>
InBlock.gif
/// 创建Key
InBlock.gif
/// </summary>
ExpandedSubBlockEnd.gif
/// <returns></returns>

ExpandedSubBlockStart.gifContractedSubBlock.gifpublic string GenerateKey() dot.gif{
InBlock.gif// 创建一个DES 算法的实例。自动产生Key
InBlock.gif
DESCryptoServiceProvider desCrypto =(DESCryptoServiceProvider)DESCryptoServiceProvider.Create();
InBlock.gif
InBlock.gif// 返回自动创建的Key 用于加密
InBlock.gif
return ASCIIEncoding.ASCII.GetString(desCrypto.Key);
ExpandedSubBlockEnd.gif }

InBlock.gif
ExpandedSubBlockStart.gifContractedSubBlock.gif/**//// <summary>
InBlock.gif
/// 加密字符串
InBlock.gif
/// </summary>
InBlock.gif
/// <param name="sInputString">输入字符</param>
InBlock.gif
/// <param name="sKey">Key</param>
ExpandedSubBlockEnd.gif
/// <returns>加密结果</returns>

ExpandedSubBlockStart.gifContractedSubBlock.gifpublic string EncryptString(string sInputString,string sKey)dot.gif{
InBlock.gifbyte[] data = Encoding.Default.GetBytes(sInputString);
InBlock.gifbyte[] result;
InBlock.gif DESCryptoServiceProvider DES = new DESCryptoServiceProvider();
InBlock.gif DES.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
InBlock.gif DES.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
InBlock.gif ICryptoTransform desencrypt = DES.CreateEncryptor();
InBlock.gif result = desencrypt.TransformFinalBlock(data,0,data.Length);
InBlock.gif
InBlock.gifstring desString = "";
ExpandedSubBlockStart.gifContractedSubBlock.giffor(int i=0;i<result.Length;i++)dot.gif{
InBlock.gif desString += result[i].ToString() + "-";
ExpandedSubBlockEnd.gif }

InBlock.gif
InBlock.gif//return desString.TrimEnd('-');
InBlock.gif
return BitConverter.ToString(result);
ExpandedSubBlockEnd.gif }

InBlock.gif
ExpandedSubBlockStart.gifContractedSubBlock.gif/**//// <summary>
InBlock.gif
/// 解密字符串
InBlock.gif
/// </summary>
InBlock.gif
/// <param name="sInputString">输入字符</param>
InBlock.gif
/// <param name="sKey">Key</param>
ExpandedSubBlockEnd.gif
/// <returns>解密结果</returns>

ExpandedSubBlockStart.gifContractedSubBlock.gifpublic string DecryptString(string sInputString,string sKey)dot.gif{
InBlock.gifstring[] sInput = sInputString.Split("-".ToCharArray());
InBlock.gifbyte[] data = new byte[sInput.Length];
InBlock.gifbyte[] result;
InBlock.giffor(int i=0;i<sInput.Length;i++)
InBlock.gif data[i] = byte.Parse(sInput[i],System.Globalization.NumberStyles.HexNumber);
InBlock.gif
InBlock.gif DESCryptoServiceProvider DES = new DESCryptoServiceProvider();
InBlock.gif DES.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
InBlock.gif DES.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
InBlock.gif ICryptoTransform desencrypt = DES.CreateDecryptor();
InBlock.gif result = desencrypt.TransformFinalBlock(data,0,data.Length);
InBlock.gifreturn Encoding.Default.GetString(result);
ExpandedSubBlockEnd.gif }

InBlock.gif
ExpandedSubBlockStart.gifContractedSubBlock.gif/**//// <summary>
InBlock.gif
/// 加密文件
InBlock.gif
/// </summary>
InBlock.gif
/// <param name="sInputFilename">输入文件</param>
InBlock.gif
/// <param name="sOutputFilename">输出文件</param>
ExpandedSubBlockEnd.gif
/// <param name="sKey">Key</param>

InBlock.gifpublic void EncryptFile(string sInputFilename,
InBlock.gifstring sOutputFilename,
ExpandedSubBlockStart.gifContractedSubBlock.gifstring sKey) dot.gif{
InBlock.gif FileStream fsInput = new FileStream(sInputFilename,
InBlock.gif FileMode.Open,
InBlock.gif FileAccess.Read);
InBlock.gif
InBlock.gif FileStream fsEncrypted = new FileStream(sOutputFilename,
InBlock.gif FileMode.Create,
InBlock.gif FileAccess.Write);
InBlock.gif DESCryptoServiceProvider DES = new DESCryptoServiceProvider();
InBlock.gif DES.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
InBlock.gif DES.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
InBlock.gif ICryptoTransform desencrypt = DES.CreateEncryptor();
InBlock.gif CryptoStream cryptostream = new CryptoStream(fsEncrypted,
InBlock.gif desencrypt,
InBlock.gif CryptoStreamMode.Write);
InBlock.gif
InBlock.gifbyte[] bytearrayinput = new byte[fsInput.Length];
InBlock.gif fsInput.Read(bytearrayinput, 0, bytearrayinput.Length);
InBlock.gif cryptostream.Write(bytearrayinput, 0, bytearrayinput.Length);
InBlock.gif cryptostream.Close();
InBlock.gif fsInput.Close();
InBlock.gif fsEncrypted.Close();
ExpandedSubBlockEnd.gif }

InBlock.gif
ExpandedSubBlockStart.gifContractedSubBlock.gif/**//// <summary>
InBlock.gif
/// 解密文件
InBlock.gif
/// </summary>
InBlock.gif
/// <param name="sInputFilename">输入文件</param>
InBlock.gif
/// <param name="sOutputFilename">输出文件</param>
ExpandedSubBlockEnd.gif
/// <param name="sKey">Key</param>

InBlock.gifpublic void DecryptFile(string sInputFilename,
InBlock.gifstring sOutputFilename,
ExpandedSubBlockStart.gifContractedSubBlock.gifstring sKey) dot.gif{
InBlock.gif DESCryptoServiceProvider DES = new DESCryptoServiceProvider();
InBlock.gif DES.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
InBlock.gif DES.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
InBlock.gif
InBlock.gif FileStream fsread = new FileStream(sInputFilename,
InBlock.gif FileMode.Open,
InBlock.gif FileAccess.Read);
InBlock.gif ICryptoTransform desdecrypt = DES.CreateDecryptor();
InBlock.gif CryptoStream cryptostreamDecr = new CryptoStream(fsread,
InBlock.gif desdecrypt,
InBlock.gif CryptoStreamMode.Read);
InBlock.gif StreamWriter fsDecrypted = new StreamWriter(sOutputFilename);
InBlock.gif fsDecrypted.Write(new StreamReader(cryptostreamDecr).ReadToEnd());
InBlock.gif fsDecrypted.Flush();
InBlock.gif fsDecrypted.Close();
ExpandedSubBlockEnd.gif }

InBlock.gif
ExpandedSubBlockEnd.gif }

ExpandedBlockEnd.gif}



本文转自suifei博客园博客,原文链接http://www.cnblogs.com/Chinasf/archive/2005/05/18/157910.html,如需转载请自行联系原作者

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