<>C#加密算法汇总

方法一:

 
   
   
     
// 须添加对System.Web的引用
using System.Web.Security;

...

/// <summary>
/// SHA1加密字符串
/// </summary>
/// <param name="source"> 源字符串 </param>
/// <returns> 加密后的字符串 </returns>
public string SHA1( string source)
{
return FormsAuthentication.HashPasswordForStoringInConfigFile(source, " SHA1 " );
}


/// <summary>
/// MD5加密字符串
/// </summary>
/// <param name="source"> 源字符串 </param>
/// <returns> 加密后的字符串 </returns>
public string MD5( string source)
{
return FormsAuthentication.HashPasswordForStoringInConfigFile(source, " MD5 " );;
}
 
方法二(可逆加密解密):

 
   
   
     
using System.Security.Cryptography;

...

public string Encode( string data)
{
byte [] byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(KEY_64);
byte [] byIV = System.Text.ASCIIEncoding.ASCII.GetBytes(IV_64);

DESCryptoServiceProvider cryptoProvider
= new DESCryptoServiceProvider();
int i = cryptoProvider.KeySize;
MemoryStream ms
= new MemoryStream();
CryptoStream cst
= new CryptoStream(ms, cryptoProvider.CreateEncryptor(byKey, byIV), CryptoStreamMode.Write);

StreamWriter sw
= new StreamWriter(cst);
sw.Write(data);
sw.Flush();
cst.FlushFinalBlock();
sw.Flush();
return Convert.ToBase64String(ms.GetBuffer(), 0 , ( int )ms.Length);

}

public string Decode( string data)
{
byte [] byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(KEY_64);
byte [] byIV = System.Text.ASCIIEncoding.ASCII.GetBytes(IV_64);

byte [] byEnc;
try
{
byEnc
= Convert.FromBase64String(data);
}
catch
{
return null ;
}

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();
}
方法三(MD5不可逆):
 
   
   
     
using System.Security.Cryptography;

...

// MD5不可逆加密

// 32位加密

public string GetMD5_32( string s, string _input_charset)
{
MD5 md5
= new MD5CryptoServiceProvider();
byte [] t = md5.ComputeHash(Encoding.GetEncoding(_input_charset).GetBytes(s));
StringBuilder sb
= new StringBuilder( 32 );
for ( int i = 0 ; i < t.Length; i ++ )
{
sb.Append(t[i].ToString(
" x " ).PadLeft( 2 , ' 0 ' ));
}
return sb.ToString();
}

// 16位加密
public static string GetMd5_16( string ConvertString)
{
MD5CryptoServiceProvider md5
= new MD5CryptoServiceProvider();
string t2 = BitConverter.ToString(md5.ComputeHash(UTF8Encoding.Default.GetBytes(ConvertString)), 4 , 8 );
t2
= t2.Replace( " - " , "" );
return t2;
}
方法四(对称加密):

 
   
   
     
using System.IO;
using System.Security.Cryptography;

...

private SymmetricAlgorithm mobjCryptoService;
private string Key;
/// <summary>
/// 对称加密类的构造函数
/// </summary>
public SymmetricMethod()
{
mobjCryptoService
= new RijndaelManaged();
Key
= " Guz(%&hj7x89H$yuBI0456FtmaT5&fvHUFCy76*h%(HilJ$lhj!y6&(*jkP87jH7 " ;
}
/// <summary>
/// 获得密钥
/// </summary>
/// <returns> 密钥 </returns>
private byte [] GetLegalKey()
{
string sTemp = Key;
mobjCryptoService.GenerateKey();
byte [] bytTemp = mobjCryptoService.Key;
int KeyLength = bytTemp.Length;
if (sTemp.Length > KeyLength)
sTemp
= sTemp.Substring( 0 , KeyLength);
else if (sTemp.Length < KeyLength)
sTemp
= sTemp.PadRight(KeyLength, ' ' );
return ASCIIEncoding.ASCII.GetBytes(sTemp);
}
/// <summary>
/// 获得初始向量IV
/// </summary>
/// <returns> 初试向量IV </returns>
private byte [] GetLegalIV()
{
string sTemp = " E4ghj*Ghg7!rNIfb&95GUY86GfghUb#er57HBh(u%g6HJ($jhWk7&!hg4ui%$hjk " ;
mobjCryptoService.GenerateIV();
byte [] bytTemp = mobjCryptoService.IV;
int IVLength = bytTemp.Length;
if (sTemp.Length > IVLength)
sTemp
= sTemp.Substring( 0 , IVLength);
else if (sTemp.Length < IVLength)
sTemp
= sTemp.PadRight(IVLength, ' ' );
return ASCIIEncoding.ASCII.GetBytes(sTemp);
}
/// <summary>
/// 加密方法
/// </summary>
/// <param name="Source"> 待加密的串 </param>
/// <returns> 经过加密的串 </returns>
public string Encrypto( string Source)
{
byte [] bytIn = UTF8Encoding.UTF8.GetBytes(Source);
MemoryStream ms
= new MemoryStream();
mobjCryptoService.Key
= GetLegalKey();
mobjCryptoService.IV
= GetLegalIV();
ICryptoTransform encrypto
= mobjCryptoService.CreateEncryptor();
CryptoStream cs
= new CryptoStream(ms, encrypto, CryptoStreamMode.Write);
cs.Write(bytIn,
0 , bytIn.Length);
cs.FlushFinalBlock();
ms.Close();
byte [] bytOut = ms.ToArray();
return Convert.ToBase64String(bytOut);
}
/// <summary>
/// 解密方法
/// </summary>
/// <param name="Source"> 待解密的串 </param>
/// <returns> 经过解密的串 </returns>
public string Decrypto( string Source)
{
byte [] bytIn = Convert.FromBase64String(Source);
MemoryStream ms
= new MemoryStream(bytIn, 0 , bytIn.Length);
mobjCryptoService.Key
= GetLegalKey();
mobjCryptoService.IV
= GetLegalIV();
ICryptoTransform encrypto
= mobjCryptoService.CreateDecryptor();
CryptoStream cs
= new CryptoStream(ms, encrypto, CryptoStreamMode.Read);
StreamReader sr
= new StreamReader(cs);
return sr.ReadToEnd();
}
方法五:
 
   
   
     
using System.IO;
using System.Security.Cryptography;
using System.Text;

...

// 默认密钥向量
private static byte [] Keys = { 0x12 , 0x34 , 0x56 , 0x78 , 0x90 , 0xAB , 0xCD , 0xEF };
/// <summary>
/// DES加密字符串
/// </summary>
/// <param name="encryptString"> 待加密的字符串 </param>
/// <param name="encryptKey"> 加密密钥,要求为8位 </param>
/// <returns> 加密成功返回加密后的字符串,失败返回源串 </returns>
public static string EncryptDES( string encryptString, string encryptKey)
{
try
{
byte [] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring( 0 , 8 ));
byte [] rgbIV = Keys;
byte [] inputByteArray = Encoding.UTF8.GetBytes(encryptString);
DESCryptoServiceProvider dCSP
= new DESCryptoServiceProvider();
MemoryStream mStream
= new MemoryStream();
CryptoStream cStream
= new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
cStream.Write(inputByteArray,
0 , inputByteArray.Length);
cStream.FlushFinalBlock();
return Convert.ToBase64String(mStream.ToArray());
}
catch
{
return encryptString;
}
}

/// <summary>
/// DES解密字符串
/// </summary>
/// <param name="decryptString"> 待解密的字符串 </param>
/// <param name="decryptKey"> 解密密钥,要求为8位,和加密密钥相同 </param>
/// <returns> 解密成功返回解密后的字符串,失败返源串 </returns>
public static string DecryptDES( string decryptString, string decryptKey)
{
try
{
byte [] rgbKey = Encoding.UTF8.GetBytes(decryptKey);
byte [] rgbIV = Keys;
byte [] inputByteArray = Convert.FromBase64String(decryptString);
DESCryptoServiceProvider DCSP
= new DESCryptoServiceProvider();
MemoryStream mStream
= new MemoryStream();
CryptoStream cStream
= new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
cStream.Write(inputByteArray,
0 , inputByteArray.Length);
cStream.FlushFinalBlock();
return Encoding.UTF8.GetString(mStream.ToArray());
}
catch
{
return decryptString;
}
}
 
  
方法六(文件加密):
 
   
   
     
using System.IO;
using System.Security.Cryptography;
using System.Text;

...

// 加密文件
private static void EncryptData(String inName, String outName, byte [] desKey, byte [] desIV)
{
// Create the file streams to handle the input and output files.
FileStream fin = new FileStream(inName, FileMode.Open, FileAccess.Read);
FileStream fout
= new FileStream(outName, FileMode.OpenOrCreate, FileAccess.Write);
fout.SetLength(
0 );

// Create variables to help with read and write.
byte [] bin = new byte [ 100 ]; // This is intermediate storage for the encryption.
long rdlen = 0 ; // This is the total number of bytes written.
long totlen = fin.Length; // This is the total length of the input file.
int len; // This is the number of bytes to be written at a time.

DES des
= new DESCryptoServiceProvider();
CryptoStream encStream
= new CryptoStream(fout, des.CreateEncryptor(desKey, desIV), CryptoStreamMode.Write);

// Read from the input file, then encrypt and write to the output file.
while (rdlen < totlen)
{
len
= fin.Read(bin, 0 , 100 );
encStream.Write(bin,
0 , len);
rdlen
= rdlen + len;
}

encStream.Close();
fout.Close();
fin.Close();
}

// 解密文件
private static void DecryptData(String inName, String outName, byte [] desKey, byte [] desIV)
{
// Create the file streams to handle the input and output files.
FileStream fin = new FileStream(inName, FileMode.Open, FileAccess.Read);
FileStream fout
= new FileStream(outName, FileMode.OpenOrCreate, FileAccess.Write);
fout.SetLength(
0 );

// Create variables to help with read and write.
byte [] bin = new byte [ 100 ]; // This is intermediate storage for the encryption.
long rdlen = 0 ; // This is the total number of bytes written.
long totlen = fin.Length; // This is the total length of the input file.
int len; // This is the number of bytes to be written at a time.

DES des
= new DESCryptoServiceProvider();
CryptoStream encStream
= new CryptoStream(fout, des.CreateDecryptor(desKey, desIV), CryptoStreamMode.Write);

// Read from the input file, then encrypt and write to the output file.
while (rdlen < totlen)
{
len
= fin.Read(bin, 0 , 100 );
encStream.Write(bin,
0 , len);
rdlen
= rdlen + len;
}

encStream.Close();
fout.Close();
fin.Close();

}



 
   
   
     
using System;
using System.Security.Cryptography; // 这个是处理文字编码的前提
using System.Text;
using System.IO;
/// <summary>
/// DES加密方法
/// </summary>
/// <param name="strPlain"> 明文 </param>
/// <param name="strDESKey"> 密钥 </param>
/// <param name="strDESIV"> 向量 </param>
/// <returns> 密文 </returns>
public string DESEncrypt( string strPlain, string strDESKey, string strDESIV)
{
// 把密钥转换成字节数组
byte [] bytesDESKey = ASCIIEncoding.ASCII.GetBytes(strDESKey);
// 把向量转换成字节数组
byte [] bytesDESIV = ASCIIEncoding.ASCII.GetBytes(strDESIV);
// 声明1个新的DES对象
DESCryptoServiceProvider desEncrypt = new DESCryptoServiceProvider();
// 开辟一块内存流
MemoryStream msEncrypt = new MemoryStream();
// 把内存流对象包装成加密流对象
CryptoStream csEncrypt = new CryptoStream(msEncrypt,desEncrypt.CreateEncryptor(bytesDESKey,bytesDESIV),CryptoStreamMode.Write);
// 把加密流对象包装成写入流对象
StreamWriter swEncrypt = new StreamWriter(csEncrypt);
// 写入流对象写入明文
swEncrypt.WriteLine(strPlain);
// 写入流关闭
swEncrypt.Close();
// 加密流关闭
csEncrypt.Close();
// 把内存流转换成字节数组,内存流现在已经是密文了
byte [] bytesCipher = msEncrypt.ToArray();
// 内存流关闭
msEncrypt.Close();
// 把密文字节数组转换为字符串,并返回
return UnicodeEncoding.Unicode.GetString(bytesCipher);
}




/// <summary>
/// DES解密方法
/// </summary>
/// <param name="strCipher"> 密文 </param>
/// <param name="strDESKey"> 密钥 </param>
/// <param name="strDESIV"> 向量 </param>
/// <returns> 明文 </returns>
public string DESDecrypt( string strCipher, string strDESKey, string strDESIV)
{
// 把密钥转换成字节数组
byte [] bytesDESKey = ASCIIEncoding.ASCII.GetBytes(strDESKey);
// 把向量转换成字节数组
byte [] bytesDESIV = ASCIIEncoding.ASCII.GetBytes(strDESIV);
// 把密文转换成字节数组
byte [] bytesCipher = UnicodeEncoding.Unicode.GetBytes(strCipher);
// 声明1个新的DES对象
DESCryptoServiceProvider desDecrypt = new DESCryptoServiceProvider();
// 开辟一块内存流,并存放密文字节数组
MemoryStream msDecrypt = new MemoryStream(bytesCipher);
// 把内存流对象包装成解密流对象
CryptoStream csDecrypt = new CryptoStream(msDecrypt,desDecrypt.CreateDecryptor(bytesDESKey,bytesDESIV),CryptoStreamMode.Read);
// 把解密流对象包装成读出流对象
StreamReader srDecrypt = new StreamReader(csDecrypt);
// 明文=读出流的读出内容
string strPlainText = srDecrypt.ReadLine();
// 读出流关闭
srDecrypt.Close();
// 解密流关闭
csDecrypt.Close();
// 内存流关闭
msDecrypt.Close();
// 返回明文
return strPlainText;
}
 
  
出处:学无止境-博客园 (http://www.cnblogs.com/zengxiangzhan/)

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