常用编码工具类,支持base64,md5,des,crc32
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
using System;
using System.IO;
using System.Security;
using System.Security.Cryptography;
using System.Runtime.InteropServices;
using System.Text;
namespace YNEC.Services.Encrypt 
{
/**//// <summary>
/// CRC 效验
/// 快速检测算法
/// </summary>
public class CRC32{
protected ulong[] crc32Table;
/**//// <summary>
/// 构造：初始化效验表
/// </summary>
public CRC32() {
const ulong ulPolynomial = 0xEDB88320;
ulong dwCrc;
crc32Table = new ulong[256];
int i,j;
for(i = 0; i < 256; i++) {
dwCrc = (ulong)i;
for(j = 8; j > 0; j--) {
if((dwCrc & 1)==1)
dwCrc = (dwCrc >> 1) ^ ulPolynomial;
else
dwCrc >>= 1;
}
crc32Table[i] = dwCrc;
}
}
/**//// <summary>
/// 字节数组效验
/// </summary>
/// <param name="buffer">ref 字节数组</param>
/// <returns></returns>
public ulong ByteCRC(ref byte[] buffer) {
ulong ulCRC = 0xffffffff;
ulong len;
len = (ulong)buffer.Length;
for (ulong buffptr=0; buffptr < len; buffptr++) {
ulong tabPtr = ulCRC & 0xFF;
tabPtr = tabPtr ^ buffer[buffptr];
ulCRC = ulCRC >> 8;
ulCRC = ulCRC ^ crc32Table[tabPtr];
}
return ulCRC ^ 0xffffffff;
}
/**//// <summary>
/// 字符串效验
/// </summary>
/// <param name="sInputString">字符串</param>
/// <returns></returns>
public ulong StringCRC(string sInputString){
byte[] buffer = Encoding.Default.GetBytes(sInputString);
return ByteCRC(ref buffer);
}
/**//// <summary>
/// 文件效验
/// </summary>
/// <param name="sInputFilename">输入文件</param>
/// <returns></returns>
public ulong FileCRC(string sInputFilename){
FileStream inFile = new System.IO.FileStream(sInputFilename, System.IO.FileMode.Open, System.IO.FileAccess.Read);
byte[] bInput = new byte[inFile.Length];
inFile.Read(bInput,0,bInput.Length);
inFile.Close();
return ByteCRC(ref bInput);
}
}
/**//// <summary>
/// MD5 无逆向编码
/// 获取唯一特征串，可用于密码加密
/// (无法还原)
/// </summary>
public class MD5 {
public MD5(){
}
/**//// <summary>
/// 获取字符串的特征串
/// </summary>
/// <param name="sInputString">输入文本</param>
/// <returns></returns>
public string HashString(string sInputString){
System.Security.Cryptography.MD5 md5 = System.Security.Cryptography.MD5.Create();
string encoded = BitConverter.ToString(md5.ComputeHash(Encoding.Default.GetBytes(sInputString))).Replace("-","");
return encoded;
}
/**//// <summary>
/// 获取文件的特征串
/// </summary>
/// <param name="sInputFilename">输入文件</param>
/// <returns></returns>
public string HashFile(string sInputFilename){
System.Security.Cryptography.MD5 md5 = System.Security.Cryptography.MD5.Create();
FileStream inFile = new System.IO.FileStream(sInputFilename, System.IO.FileMode.Open, System.IO.FileAccess.Read);
byte[] bInput = new byte[inFile.Length];
inFile.Read(bInput,0,bInput.Length);
inFile.Close();
string encoded = BitConverter.ToString(md5.ComputeHash(bInput)).Replace("-","");
return encoded;
}
}
/**//// <summary>
/// Base64 UUEncoded 编码
/// 将二进制编码为ASCII文本，用于网络传输
/// (可还原)
/// </summary>
public class BASE64{
public BASE64(){
}
/**//// <summary>
/// 解码字符串
/// </summary>
/// <param name="sInputString">输入文本</param>
/// <returns></returns>
public string DecryptString(string sInputString){
char[] sInput = sInputString.ToCharArray();
try{
byte[] bOutput = System.Convert.FromBase64String(sInputString);
return Encoding.Default.GetString(bOutput);
}
catch ( System.ArgumentNullException ) {
//base 64 字符数组为null
return "";
}
catch ( System.FormatException ) {
//长度错误，无法整除4
return "";
}
}
/**//// <summary>
/// 编码字符串
/// </summary>
/// <param name="sInputString">输入文本</param>
/// <returns></returns>
public string EncryptString(string sInputString){
byte[] bInput = Encoding.Default.GetBytes(sInputString);
try {
return System.Convert.ToBase64String(bInput,0,bInput.Length);
}
catch (System.ArgumentNullException) {
//二进制数组为NULL.
return "";
}
catch (System.ArgumentOutOfRangeException) {
//长度不够
return "";
}
}
/**//// <summary>
/// 解码文件
/// </summary>
/// <param name="sInputFilename">输入文件</param>
/// <param name="sOutputFilename">输出文件</param>
public void DecryptFile(string sInputFilename,string sOutputFilename) {
System.IO.StreamReader inFile;
char[] base64CharArray;
try {
inFile = new System.IO.StreamReader(sInputFilename,
System.Text.Encoding.ASCII);
base64CharArray = new char[inFile.BaseStream.Length];
inFile.Read(base64CharArray, 0, (int)inFile.BaseStream.Length);
inFile.Close();
}
catch {//(System.Exception exp) {
return;
}
// 转换Base64 UUEncoded为二进制输出
byte[] binaryData;
try {
binaryData =
System.Convert.FromBase64CharArray(base64CharArray,
0,
base64CharArray.Length);
}
catch ( System.ArgumentNullException ) {
//base 64 字符数组为null
return;
}
catch ( System.FormatException ) {
//长度错误，无法整除4
return;
}
// 写输出数据
System.IO.FileStream outFile;
try {
outFile = new System.IO.FileStream(sOutputFilename,
System.IO.FileMode.Create,
System.IO.FileAccess.Write);
outFile.Write(binaryData, 0, binaryData.Length);
outFile.Close();
}
catch{// (System.Exception exp) {
//流错误
}
}
/**//// <summary>
/// 编码文件
/// </summary>
/// <param name="sInputFilename">输入文件</param>
/// <param name="sOutputFilename">输出文件</param>
public void EncryptFile(string sInputFilename,string sOutputFilename){
System.IO.FileStream inFile;
byte[] binaryData;
try {
inFile = new System.IO.FileStream(sInputFilename,
System.IO.FileMode.Open,
System.IO.FileAccess.Read);
binaryData = new Byte[inFile.Length];
long bytesRead = inFile.Read(binaryData, 0,
(int) inFile.Length);
inFile.Close();
}
catch { //(System.Exception exp) {
return;
}
// 转换二进制输入为Base64 UUEncoded输出
// 每3个字节在源数据里作为4个字节
long arrayLength = (long) ((4.0d/3.0d) * binaryData.Length);
// 如果无法整除4
if (arrayLength % 4 != 0) {
arrayLength += 4 - arrayLength % 4;
}
char[] base64CharArray = new char[arrayLength];
try {
System.Convert.ToBase64CharArray(binaryData,
0,
binaryData.Length,
base64CharArray,
0);
}
catch (System.ArgumentNullException) {
//二进制数组为NULL.
return;
}
catch (System.ArgumentOutOfRangeException) {
//长度不够
return;
}
// 写UUEncoded数据到文件内
System.IO.StreamWriter outFile;
try {
outFile = new System.IO.StreamWriter(sOutputFilename,
false,
System.Text.Encoding.ASCII);
outFile.Write(base64CharArray);
outFile.Close();
}
catch{// (System.Exception exp) {
//文件流出错
}
}
}
/**//// <summary>
/// DES 加密
/// 支持Key(钥匙)加密变化
/// 支持还原
///
/// 演示操作：
/// // 64位，8个字节
/// string sSecretKey;
///
/// // 获取Key
/// sSecretKey = GenerateKey();
///
/// // 托管
/// GCHandle gch = GCHandle.Alloc( sSecretKey,GCHandleType.Pinned );
///
/// // 加密文件
/// EncryptFile(@"C:\MyData.txt",
/// @"C:\Encrypted.txt",
/// sSecretKey);
///
/// // 解密文件
/// DecryptFile(@"C:\Encrypted.txt",
/// @"C:\Decrypted.txt",
/// sSecretKey);
///
/// // 释放托管内容
/// ZeroMemory(gch.AddrOfPinnedObject(), sSecretKey.Length * 2);
/// gch.Free();
/// </summary>
public class DES {
[DllImport("KERNEL32.DLL", EntryPoint="RtlZeroMemory")]
public static extern bool ZeroMemory(IntPtr Destination, int Length);
public DES() {
//
// TODO: 在此处添加构造函数逻辑
//
}
/**//// <summary>
/// 创建Key
/// </summary>
/// <returns></returns>
public string GenerateKey() {
// 创建一个DES 算法的实例。自动产生Key
DESCryptoServiceProvider desCrypto =(DESCryptoServiceProvider)DESCryptoServiceProvider.Create();
// 返回自动创建的Key 用于加密
return ASCIIEncoding.ASCII.GetString(desCrypto.Key);
}
/**//// <summary>
/// 加密字符串
/// </summary>
/// <param name="sInputString">输入字符</param>
/// <param name="sKey">Key</param>
/// <returns>加密结果</returns>
public string EncryptString(string sInputString,string sKey){
byte[] data = Encoding.Default.GetBytes(sInputString);
byte[] result;
DESCryptoServiceProvider DES = new DESCryptoServiceProvider();
DES.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
DES.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
ICryptoTransform desencrypt = DES.CreateEncryptor();
result = desencrypt.TransformFinalBlock(data,0,data.Length);
string desString = "";
for(int i=0;i<result.Length;i++){
desString += result[i].ToString() + "-";
}
//return desString.TrimEnd('-');
return BitConverter.ToString(result);
}
/**//// <summary>
/// 解密字符串
/// </summary>
/// <param name="sInputString">输入字符</param>
/// <param name="sKey">Key</param>
/// <returns>解密结果</returns>
public string DecryptString(string sInputString,string sKey){
string[] sInput = sInputString.Split("-".ToCharArray());
byte[] data = new byte[sInput.Length];
byte[] result;
for(int i=0;i<sInput.Length;i++)
data[i] = byte.Parse(sInput[i],System.Globalization.NumberStyles.HexNumber);
DESCryptoServiceProvider DES = new DESCryptoServiceProvider();
DES.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
DES.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
ICryptoTransform desencrypt = DES.CreateDecryptor();
result = desencrypt.TransformFinalBlock(data,0,data.Length);
return Encoding.Default.GetString(result);
}
/**//// <summary>
/// 加密文件
/// </summary>
/// <param name="sInputFilename">输入文件</param>
/// <param name="sOutputFilename">输出文件</param>
/// <param name="sKey">Key</param>
public 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();
}
/**//// <summary>
/// 解密文件
/// </summary>
/// <param name="sInputFilename">输入文件</param>
/// <param name="sOutputFilename">输出文件</param>
/// <param name="sKey">Key</param>
public void DecryptFile(string sInputFilename,
string sOutputFilename,
string sKey) {
DESCryptoServiceProvider DES = new DESCryptoServiceProvider();
DES.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
DES.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
FileStream fsread = new FileStream(sInputFilename,
FileMode.Open,
FileAccess.Read);
ICryptoTransform desdecrypt = DES.CreateDecryptor();
CryptoStream cryptostreamDecr = new CryptoStream(fsread,
desdecrypt,
CryptoStreamMode.Read);
StreamWriter fsDecrypted = new StreamWriter(sOutputFilename);
fsDecrypted.Write(new StreamReader(cryptostreamDecr).ReadToEnd());
fsDecrypted.Flush();
fsDecrypted.Close();
}
}
}
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
using System;using System.IO;using System.Security;using System.Security.Cryptography;using System.Runtime.InteropServices;using System.Text;namespace YNEC.Services.Encrypt { /**//// <summary> /// CRC 效验 /// 快速检测算法 /// </summary> public class CRC32{ protected ulong[] crc32Table; /**//// <summary> /// 构造：初始化效验表 /// </summary> public CRC32() { const ulong ulPolynomial = 0xEDB88320; ulong dwCrc; crc32Table = new ulong[256]; int i,j; for(i = 0; i < 256; i++) { dwCrc = (ulong)i; for(j = 8; j > 0; j--) { if((dwCrc & 1)==1) dwCrc = (dwCrc >> 1) ^ ulPolynomial; else dwCrc >>= 1; } crc32Table[i] = dwCrc; } } /**//// <summary> /// 字节数组效验 /// </summary> /// <param name="buffer">ref 字节数组</param> /// <returns></returns> public ulong ByteCRC(ref byte[] buffer) { ulong ulCRC = 0xffffffff; ulong len; len = (ulong)buffer.Length; for (ulong buffptr=0; buffptr < len; buffptr++) { ulong tabPtr = ulCRC & 0xFF; tabPtr = tabPtr ^ buffer[buffptr]; ulCRC = ulCRC >> 8; ulCRC = ulCRC ^ crc32Table[tabPtr]; } return ulCRC ^ 0xffffffff; } /**//// <summary> /// 字符串效验 /// </summary> /// <param name="sInputString">字符串</param> /// <returns></returns> public ulong StringCRC(string sInputString){ byte[] buffer = Encoding.Default.GetBytes(sInputString); return ByteCRC(ref buffer); } /**//// <summary> /// 文件效验 /// </summary> /// <param name="sInputFilename">输入文件</param> /// <returns></returns> public ulong FileCRC(string sInputFilename){ FileStream inFile = new System.IO.FileStream(sInputFilename, System.IO.FileMode.Open, System.IO.FileAccess.Read); byte[] bInput = new byte[inFile.Length]; inFile.Read(bInput,0,bInput.Length); inFile.Close(); return ByteCRC(ref bInput); } } /**//// <summary> /// MD5 无逆向编码 /// 获取唯一特征串，可用于密码加密 /// (无法还原) /// </summary> public class MD5 { public MD5(){ } /**//// <summary> /// 获取字符串的特征串 /// </summary> /// <param name="sInputString">输入文本</param> /// <returns></returns> public string HashString(string sInputString){ System.Security.Cryptography.MD5 md5 = System.Security.Cryptography.MD5.Create(); string encoded = BitConverter.ToString(md5.ComputeHash(Encoding.Default.GetBytes(sInputString))).Replace("-",""); return encoded; } /**//// <summary> /// 获取文件的特征串 /// </summary> /// <param name="sInputFilename">输入文件</param> /// <returns></returns> public string HashFile(string sInputFilename){ System.Security.Cryptography.MD5 md5 = System.Security.Cryptography.MD5.Create(); FileStream inFile = new System.IO.FileStream(sInputFilename, System.IO.FileMode.Open, System.IO.FileAccess.Read); byte[] bInput = new byte[inFile.Length]; inFile.Read(bInput,0,bInput.Length); inFile.Close(); string encoded = BitConverter.ToString(md5.ComputeHash(bInput)).Replace("-",""); return encoded; } } /**//// <summary> /// Base64 UUEncoded 编码 /// 将二进制编码为ASCII文本，用于网络传输 /// (可还原) /// </summary> public class BASE64{ public BASE64(){ } /**//// <summary> /// 解码字符串 /// </summary> /// <param name="sInputString">输入文本</param> /// <returns></returns> public string DecryptString(string sInputString){ char[] sInput = sInputString.ToCharArray(); try{ byte[] bOutput = System.Convert.FromBase64String(sInputString); return Encoding.Default.GetString(bOutput); } catch ( System.ArgumentNullException ) { //base 64 字符数组为null return ""; } catch ( System.FormatException ) { //长度错误，无法整除4 return ""; } } /**//// <summary> /// 编码字符串 /// </summary> /// <param name="sInputString">输入文本</param> /// <returns></returns> public string EncryptString(string sInputString){ byte[] bInput = Encoding.Default.GetBytes(sInputString); try { return System.Convert.ToBase64String(bInput,0,bInput.Length); } catch (System.ArgumentNullException) { //二进制数组为NULL. return ""; } catch (System.ArgumentOutOfRangeException) { //长度不够 return ""; } } /**//// <summary> /// 解码文件 /// </summary> /// <param name="sInputFilename">输入文件</param> /// <param name="sOutputFilename">输出文件</param> public void DecryptFile(string sInputFilename,string sOutputFilename) { System.IO.StreamReader inFile; char[] base64CharArray; try { inFile = new System.IO.StreamReader(sInputFilename, System.Text.Encoding.ASCII); base64CharArray = new char[inFile.BaseStream.Length]; inFile.Read(base64CharArray, 0, (int)inFile.BaseStream.Length); inFile.Close(); } catch {//(System.Exception exp) { return; } // 转换Base64 UUEncoded为二进制输出 byte[] binaryData; try { binaryData = System.Convert.FromBase64CharArray(base64CharArray, 0, base64CharArray.Length); } catch ( System.ArgumentNullException ) { //base 64 字符数组为null return; } catch ( System.FormatException ) { //长度错误，无法整除4 return; } // 写输出数据 System.IO.FileStream outFile; try { outFile = new System.IO.FileStream(sOutputFilename, System.IO.FileMode.Create, System.IO.FileAccess.Write); outFile.Write(binaryData, 0, binaryData.Length); outFile.Close(); } catch{// (System.Exception exp) { //流错误 } } /**//// <summary> /// 编码文件 /// </summary> /// <param name="sInputFilename">输入文件</param> /// <param name="sOutputFilename">输出文件</param> public void EncryptFile(string sInputFilename,string sOutputFilename){ System.IO.FileStream inFile; byte[] binaryData; try { inFile = new System.IO.FileStream(sInputFilename, System.IO.FileMode.Open, System.IO.FileAccess.Read); binaryData = new Byte[inFile.Length]; long bytesRead = inFile.Read(binaryData, 0, (int) inFile.Length); inFile.Close(); } catch { //(System.Exception exp) { return; } // 转换二进制输入为Base64 UUEncoded输出 // 每3个字节在源数据里作为4个字节 long arrayLength = (long) ((4.0d/3.0d) * binaryData.Length); // 如果无法整除4 if (arrayLength % 4 != 0) { arrayLength += 4 - arrayLength % 4; } char[] base64CharArray = new char[arrayLength]; try { System.Convert.ToBase64CharArray(binaryData, 0, binaryData.Length, base64CharArray, 0); } catch (System.ArgumentNullException) { //二进制数组为NULL. return; } catch (System.ArgumentOutOfRangeException) { //长度不够 return; } // 写UUEncoded数据到文件内 System.IO.StreamWriter outFile; try { outFile = new System.IO.StreamWriter(sOutputFilename, false, System.Text.Encoding.ASCII); outFile.Write(base64CharArray); outFile.Close(); } catch{// (System.Exception exp) { //文件流出错 } } } /**//// <summary> /// DES 加密 /// 支持Key(钥匙)加密变化 /// 支持还原 /// /// 演示操作： /// // 64位，8个字节 /// string sSecretKey; /// /// // 获取Key /// sSecretKey = GenerateKey(); /// /// // 托管 /// GCHandle gch = GCHandle.Alloc( sSecretKey,GCHandleType.Pinned ); /// /// // 加密文件 /// EncryptFile(@"C:\MyData.txt", /// @"C:\Encrypted.txt", /// sSecretKey); /// /// // 解密文件 /// DecryptFile(@"C:\Encrypted.txt", /// @"C:\Decrypted.txt", /// sSecretKey); /// /// // 释放托管内容 /// ZeroMemory(gch.AddrOfPinnedObject(), sSecretKey.Length * 2); /// gch.Free(); /// </summary> public class DES { [DllImport("KERNEL32.DLL", EntryPoint="RtlZeroMemory")] public static extern bool ZeroMemory(IntPtr Destination, int Length); public DES() { // // TODO: 在此处添加构造函数逻辑 // } /**//// <summary> /// 创建Key /// </summary> /// <returns></returns> public string GenerateKey() { // 创建一个DES 算法的实例。自动产生Key DESCryptoServiceProvider desCrypto =(DESCryptoServiceProvider)DESCryptoServiceProvider.Create(); // 返回自动创建的Key 用于加密 return ASCIIEncoding.ASCII.GetString(desCrypto.Key); } /**//// <summary> /// 加密字符串 /// </summary> /// <param name="sInputString">输入字符</param> /// <param name="sKey">Key</param> /// <returns>加密结果</returns> public string EncryptString(string sInputString,string sKey){ byte[] data = Encoding.Default.GetBytes(sInputString); byte[] result; DESCryptoServiceProvider DES = new DESCryptoServiceProvider(); DES.Key = ASCIIEncoding.ASCII.GetBytes(sKey); DES.IV = ASCIIEncoding.ASCII.GetBytes(sKey); ICryptoTransform desencrypt = DES.CreateEncryptor(); result = desencrypt.TransformFinalBlock(data,0,data.Length); string desString = ""; for(int i=0;i<result.Length;i++){ desString += result[i].ToString() + "-"; } //return desString.TrimEnd('-'); return BitConverter.ToString(result); } /**//// <summary> /// 解密字符串 /// </summary> /// <param name="sInputString">输入字符</param> /// <param name="sKey">Key</param> /// <returns>解密结果</returns> public string DecryptString(string sInputString,string sKey){ string[] sInput = sInputString.Split("-".ToCharArray()); byte[] data = new byte[sInput.Length]; byte[] result; for(int i=0;i<sInput.Length;i++) data[i] = byte.Parse(sInput[i],System.Globalization.NumberStyles.HexNumber); DESCryptoServiceProvider DES = new DESCryptoServiceProvider(); DES.Key = ASCIIEncoding.ASCII.GetBytes(sKey); DES.IV = ASCIIEncoding.ASCII.GetBytes(sKey); ICryptoTransform desencrypt = DES.CreateDecryptor(); result = desencrypt.TransformFinalBlock(data,0,data.Length); return Encoding.Default.GetString(result); } /**//// <summary> /// 加密文件 /// </summary> /// <param name="sInputFilename">输入文件</param> /// <param name="sOutputFilename">输出文件</param> /// <param name="sKey">Key</param> public 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(); } /**//// <summary> /// 解密文件 /// </summary> /// <param name="sInputFilename">输入文件</param> /// <param name="sOutputFilename">输出文件</param> /// <param name="sKey">Key</param> public void DecryptFile(string sInputFilename, string sOutputFilename, string sKey) { DESCryptoServiceProvider DES = new DESCryptoServiceProvider(); DES.Key = ASCIIEncoding.ASCII.GetBytes(sKey); DES.IV = ASCIIEncoding.ASCII.GetBytes(sKey); FileStream fsread = new FileStream(sInputFilename, FileMode.Open, FileAccess.Read); ICryptoTransform desdecrypt = DES.CreateDecryptor(); CryptoStream cryptostreamDecr = new CryptoStream(fsread, desdecrypt, CryptoStreamMode.Read); StreamWriter fsDecrypted = new StreamWriter(sOutputFilename); fsDecrypted.Write(new StreamReader(cryptostreamDecr).ReadToEnd()); fsDecrypted.Flush(); fsDecrypted.Close(); } }}
