C#字符串加密解密方法实例

本文实例讲述了c#字符串加密解密方法。分享给大家供大家参考。具体如下：

#region 加密解密
static string encryptkey= "oyea";

#region 加密字符串 public static string encrypt(string str)

/// <summary>
/// 加密字符串
/// </summary>
/// <param name="str">要加密的字符串</param>
/// <returns>返回加密后的字符串</returns>
public static string encrypt(string str)
{  
    descryptoserviceprovider descsp = new descryptoserviceprovider();  //实例化加/解密类对象 
    byte[] key = encoding.unicode.getbytes(encryptkey); //定义字节数组，用来存储密钥  
    byte[] data = encoding.unicode.getbytes(str);//定义字节数组，用来存储要加密的字符串
    memorystream mstream = new memorystream();//实例化内存流对象    
    //使用内存流实例化加密流对象 
    cryptostream cstream = new cryptostream(mstream,descsp.createencryptor(key, key), cryptostreammode.write);    
    cstream.write(data,0, data.length);  //向加密流中写入数据    
    cstream.flushfinalblock();             //释放加密流    
    return convert.tobase64string(mstream.toarray());//返回加密后的字符串
}
#endregion

#region 解密字符串   public static string decrypt(string str)

/// <summary>
/// 解密字符串
/// </summary>
/// <param name="str">要解密的字符串</param>
/// <returns>返回解密后的字符串</returns>
public static string decrypt(string str)
{    
    descryptoserviceprovider descsp = new descryptoserviceprovider();  //实例化加/解密类对象  
    byte[] key = encoding.unicode.getbytes(encryptkey); //定义字节数组，用来存储密钥  
    byte[] data = convert.frombase64string(str);//定义字节数组，用来存储要解密的字符串
    memorystream mstream = new memorystream();//实例化内存流对象    
    //使用内存流实例化解密流对象     
    cryptostream cstream = new cryptostream(mstream, descsp.createdecryptor(key, key), cryptostreammode.write);  
    cstream.write(data,0, data.length);      //向解密流中写入数据   
    cstream.flushfinalblock();              //释放解密流    
    return encoding.unicode.getstring(mstream.toarray());      //返回解密后的字符串
}
#endregion
#endregion

希望本文所述对大家的c#程序设计有所帮助。