.net 对称加密

后台

public class CryptoHelper

{

// 对称加密算法提供器

private ICryptoTransform encryptor;//加密器对象

private ICryptoTransform decryptor;//解密器对象

private const int BufferSize = 1024;

public CryptoHelper(String algorithmName, String key)

{

SymmetricAlgorithm provider = SymmetricAlgorithm.Create(algorithmName);

provider.Key = Encoding.UTF8.GetBytes(key);//加密密钥

provider.IV = new byte[] { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };//偏移量

encryptor = provider.CreateEncryptor();

decryptor = provider.CreateDecryptor();

}

/// <summary>

/// TripleDES 算法给密钥加密

/// </summary>

/// <param name="key"></param>

public CryptoHelper(string key) : this("TripleDES", key) { }

/// <summary>

/// 加密算法

/// </summary>

/// <param name="clearText"></param>

/// <returns></returns>

public String Encrypt(String clearText)

{

//创建明文流

byte[] clearBuffer = Encoding.UTF8.GetBytes(clearText);

MemoryStream clearStream = new MemoryStream(clearBuffer);

MemoryStream encryptedStream = new MemoryStream();

CryptoStream cryptoStream = new CryptoStream(encryptedStream, encryptor, CryptoStreamMode.Write);

//将明文流写入到buffer中

//将buffer中的数据写入到cryptoStream 中

int bytesRead = 0;

byte[] buffer = new byte[BufferSize];

//不能用循环会执行两次

//do

//{

bytesRead = clearStream.Read(buffer, 0, BufferSize);

cryptoStream.Write(buffer, 0, BufferSize);

//} while (bytesRead > 0);

cryptoStream.FlushFinalBlock();

//获取加密后的文本

buffer = encryptedStream.ToArray();

string encryptedText = Convert.ToBase64String(buffer);

return encryptedText;

}

/// <summary>

/// 解密算法

/// </summary>

/// <param name="encryptedText"></param>

/// <returns></returns>

public String Decrypt(String encryptedText)

{

byte[] encryptedBuffer = Convert.FromBase64String(encryptedText);

Stream encryptedStream = new MemoryStream(encryptedBuffer);

MemoryStream clearStream = new MemoryStream();

CryptoStream cryptoStream = new CryptoStream(encryptedStream, decryptor, CryptoStreamMode.Read);

int bytesRead = 0;

byte[] buffer = new byte[BufferSize];

//不能用循环会执行两次

//do

//{

bytesRead = cryptoStream.Read(buffer, 0, BufferSize);

clearStream.Write(buffer, 0, bytesRead);

//} while (bytesRead > 0);

buffer = clearStream.GetBuffer();

String clearText = Encoding.UTF8.GetString(buffer, 0, (int)clearStream.Length);

return clearText;

}

public static String Encrypt(string clearText, string Key)

{

CryptoHelper helper = new CryptoHelper(Key);

return helper.Encrypt(clearText);

}

public static String Decrypt(String encryptedText, String Key)

{

CryptoHelper helper = new CryptoHelper(Key);

return helper.Decrypt(encryptedText);

}

前台

String key = "abcdefghijklmno2";//17位数

String clearText = "欢迎光临!www.ritztours.com";

CryptoHelper helper = new CryptoHelper(key);

String encryptedText = helper.Encrypt(clearText);

String DecryptText = helper.Decrypt(encryptedText);

巴特西

.net 对称加密

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