所属类别：.NET

文章作者：未知

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提供一个基于.NET SymmetricAlgorithm 类的、带私钥的加密/解密算法的包装类。使用方法：SymmCrypto de = new SymmCrypto(SymmCrypto.SymmProvEnum.DES);
Response.Write(x.Decrypting(de.Encrypting("ok","yyy"),"yyy"));

类的实现C#编码
using System;
using System.Security.Cryptography;
using System.IO;
using System.Text;

namespace eMeng
{

///

/// SymmCrypto 的摘要说明。

/// SymmCrypto类实现.NET框架下的加密和解密服务。

/// 原作者： Frank Fang : fangfrank@hotmail.com

///

public class SymmCrypto

{

public enum SymmProvEnum : int

{

DES, RC2, Rijndael

}

private SymmetricAlgorithm mobjCryptoService;

///

/// 使用.Net SymmetricAlgorithm 类的构造器.

///

public SymmCrypto(SymmProvEnum NetSelected)

{

switch (NetSelected)

{

case SymmProvEnum.DES:

mobjCryptoService = new DESCryptoServiceProvider();

break;

case SymmProvEnum.RC2:

mobjCryptoService = new RC2CryptoServiceProvider();

break;

case SymmProvEnum.Rijndael:

mobjCryptoService = new RijndaelManaged();

break;

}

}

///

/// 使用自定义SymmetricAlgorithm类的构造器.

///

public SymmCrypto(SymmetricAlgorithm ServiceProvider)

{

mobjCryptoService = ServiceProvider;

}

///

/// Depending on the legal key size limitations of

/// a specific CryptoService provider and length of

/// the private key provided, padding the secret key

/// with space character to meet the legal size of the algorithm.

///

private byte[] GetLegalKey(string Key)

{

string sTemp;

if (mobjCryptoService.LegalKeySizes.Length > 0)

{

int lessSize = 0, moreSize = mobjCryptoService.LegalKeySizes[0].MinSize;

// key sizes are in bits

while (Key.Length * 8 > moreSize)

{

lessSize = moreSize;

moreSize += mobjCryptoService.LegalKeySizes[0].SkipSize;

}

sTemp = Key.PadRight(moreSize / 8, ' ');

}

else

sTemp = Key;

// convert the secret key to byte array

return ASCIIEncoding.ASCII.GetBytes(sTemp);

}

public string Encrypting(string Source, string Key)

{

byte[] bytIn = System.Text.ASCIIEncoding.ASCII.GetBytes(Source);

// create a MemoryStream so that the process can be done without I/O files

System.IO.MemoryStream ms = new System.IO.MemoryStream();

byte[] bytKey = GetLegalKey(Key);

// set the private key

mobjCryptoService.Key = bytKey;

mobjCryptoService.IV = bytKey;

// create an Encryptor from the Provider Service instance

ICryptoTransform encrypto = mobjCryptoService.CreateEncryptor();

// create Crypto Stream that transforms a stream using the encryption

CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Write);

// write out encrypted content into MemoryStream

cs.Write(bytIn, 0, bytIn.Length);

cs.FlushFinalBlock();

// get the output and trim the '\0' bytes

byte[] bytOut = ms.GetBuffer();

int i = 0;

for (i = 0; i < bytOut.Length; i++)

if (bytOut[i] == 0)

break;

// convert into Base64 so that the result can be used in xml

return System.Convert.ToBase64String(bytOut, 0, i);

}

public string Decrypting(string Source, string Key)

{

// convert from Base64 to binary

byte[] bytIn = System.Convert.FromBase64String(Source);

// create a MemoryStream with the input

System.IO.MemoryStream ms = new System.IO.MemoryStream(bytIn, 0, bytIn.Length);

byte[] bytKey = GetLegalKey(Key);

// set the private key

mobjCryptoService.Key = bytKey;

mobjCryptoService.IV = bytKey;

// create a Decryptor from the Provider Service instance

ICryptoTransform encrypto = mobjCryptoService.CreateDecryptor();

// create Crypto Stream that transforms a stream using the decryption

CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Read);

// read out the result from the Crypto Stream

System.IO.StreamReader sr = new System.IO.StreamReader( cs );

return sr.ReadToEnd();

}

}
}


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