DOTNETc#之加密解密(对称)

//指定加密服务类的初始化向量

des.IV = Encoding.UTF8.GetBytes(tboxIv1.Text);

//创建加密器

ICryptoTransform trans = des.CreateEncryptor();

//加密前的文件流

FileStream fsOpenFileName = new FileStream(this.tboxOpenFileName.Text,FileMode.Open,FileAccess.Read);

//创建加密后的文件流，并新建文件

FileStream fsSaveFileName = new FileStream(this.tboxSaveFileName.Text,FileMode.Create,FileAccess.Write);

//创建加密流

CryptoStream cryptoStream = new CryptoStream(fsSaveFileName,trans,CryptoStreamMode.Write);

//从加密前的文件中读取字节

byte[] b = new byte[fsOpenFileName.Length];

fsOpenFileName.Read(b,0,b.Length);

//在加密流中写入字节

cryptoStream.Write(b,0,b.Length);

//关闭加密流

cryptoStream.Close();

//关闭文件流

fsOpenFileName.Close();

fsSaveFileName.Close();

}

}

private void button4_Click(object sender, System.EventArgs e)

{

if( this.tboxKey2.Text=="请输入密钥"||tboxIv2.Text=="输入偏移量"||tboxOpenFileName.Text==""||tboxSaveFileName.Text=="")

{

MessageBox.Show("请输入完整!");

}

else

{

//创建DES加密服务类

DESCryptoServiceProvider des = new DESCryptoServiceProvider();

//指定加密服务类的密码

des.IV = Encoding.UTF8.GetBytes(tboxIv2.Text);

//指定加密服务类的初始化向量

des.Key = Encoding.UTF8.GetBytes(tboxKey2.Text);

//创建解密器

ICryptoTransform trans = des.CreateDecryptor();

//创建解密后的文件流，并新建文件

FileStream fsSaveFileName = new FileStream(this.tboxSaveFileName.Text,FileMode.Create,FileAccess.Write);