14-加密

作者: D丝学编程 | 来源:发表于2024-02-26 10:54 被阅读0次

一、MD5加密

0090.PNG

MD5特点：单向加密，只能加密，不能解密。

MD5加密案例：

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <h3>单向加密，只能加密，不能解密</h3>
    <div>
        <asp:TextBox ID="txt" runat="server"></asp:TextBox>
        <asp:Button ID="btMD5" runat="server" Text="MD5加密" onclick="btMD5_Click" />
        <asp:Label ID="lblResult" runat="server" Text=""></asp:Label>
    </div>
    </form>
</body>
</html>

public partial class Demo01_MD5 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void btMD5_Click(object sender, EventArgs e)
    {
        //MD5加密方式一：
        //string str = FormsAuthentication.HashPasswordForStoringInConfigFile(this.TextBox1.Text, "MD5");
        //this.Label1.Text = str;

        //MD5加密方式二：
        byte[] arrStart = Encoding.Default.GetBytes(this.txt.Text);   //字符串变字节数组
        MD5 md5 = new MD5CryptoServiceProvider();  //定义MD5加密类
        byte[] arrEnd = md5.ComputeHash(arrStart);  //利用md5算法对字节数组进行加密
        //加密16位
        //this.lblResult.Text = BitConverter.ToString(arrEnd,4,8).Replace("-", "");  //将加密后的字节数组转换成字符串
        //加密32位
        this.lblResult.Text = BitConverter.ToString(arrEnd).Replace("-", "");  //将加密后的字节数组转换成字符串
    }
}

二、DES加密

0091.PNG

DES特点：对称加密（加密解密钥匙相同）。

DES加密案例：

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <h3>双向对称加密（加密解密钥匙相同-DES实现对称加密）</h3>
    <div>
        <asp:TextBox ID="txtEncryption" runat="server" Width="287px"></asp:TextBox>
        <asp:Button ID="btEncryption" runat="server" Text="加密" 
            onclick="btEncryption_Click"  />
        <asp:Label ID="lblEncryption" runat="server" Text="加密结果"></asp:Label>
    </div>
    <br />
    <br />
    <div>
        <asp:TextBox ID="txtDecrypt" runat="server" Width="287px"></asp:TextBox>
        <asp:Button ID="btDecrypt" runat="server" Text="解密" 
            onclick="btDecrypt_Click"  />
        <asp:Label ID="lblDecrypt" runat="server" Text="解密结果"></asp:Label>
    </div>
    </form>
</body>
</html>

public partial class Demo02_DES : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            string key = "";
            DESCryptoServiceProvider des = (DESCryptoServiceProvider)DESCryptoServiceProvider.Create();
            key = ASCIIEncoding.ASCII.GetString(des.Key);
            ViewState["key"] = key;
        }
    }

    #region 加密
    protected void btEncryption_Click(object sender, EventArgs e)
    {
        byte[] data = Encoding.Default.GetBytes(this.txtEncryption.Text);
        DESCryptoServiceProvider DES = new DESCryptoServiceProvider();
        //此处可以使用固定的Key和IV
        DES.Key = Encoding.Default.GetBytes("gaojun11");  //长度8
        DES.IV = Encoding.Default.GetBytes("gaojun22");  //长度8
        //此处的Key,IV也可以使用Page_Load中生成的ViewState["key"]代替
        //DES.Key = Encoding.Default.GetBytes(ViewState["key"].ToString());  //长度8
        //DES.IV = Encoding.Default.GetBytes(ViewState["key"].ToString());  //长度8
        ICryptoTransform desEncrypt = DES.CreateEncryptor();
        byte[] result = desEncrypt.TransformFinalBlock(data, 0, data.Length);
        this.lblEncryption.Text = Convert.ToBase64String(result);
    }
    #endregion

    #region 解密
    protected void btDecrypt_Click(object sender, EventArgs e)
    {
        byte[] data = Convert.FromBase64String(this.txtDecrypt.Text);
        DESCryptoServiceProvider DES = new DESCryptoServiceProvider();
        //此处可以使用固定的Key和IV
        DES.Key = Encoding.Default.GetBytes("gaojun11"); //长度8
        DES.IV = Encoding.Default.GetBytes("gaojun22"); //长度8
        //此处的Key,IV也可以使用Page_Load中生成的ViewState["key"]代替
        //DES.Key = Encoding.Default.GetBytes(ViewState["key"].ToString());  //长度8
        //DES.IV = Encoding.Default.GetBytes(ViewState["key"].ToString());  //长度8
        ICryptoTransform desencrypt = DES.CreateDecryptor();
        byte[] result = desencrypt.TransformFinalBlock(data, 0, data.Length);
        this.lblDecrypt.Text = Encoding.Default.GetString(result);
        //return Encoding.UTF8.GetString(result);
    }
    #endregion
}

三、RSA加密

RSA特点：主要实现非对称加密，但这里也可以实现对称。

（1）RSA实现对称加密

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <h3>双向对称加密（加密解密钥匙相同-RSA主要实现非对称加密，但这里也可以实现对称）</h3>
    <div>
        <asp:TextBox ID="txtEncryption" runat="server" Width="287px"></asp:TextBox>
        <asp:Button ID="btEncryption" runat="server" Text="加密" 
            onclick="btEncryption_Click" />
        <asp:Label ID="lblEncryption" runat="server" Text="加密结果"></asp:Label>
    </div>
    <br />
    <br />
    <div>
        <asp:TextBox ID="txtDecrypt" runat="server" Width="287px"></asp:TextBox>
        <asp:Button ID="btDecrypt" runat="server" Text="解密" onclick="btDecrypt_Click" />
        <asp:Label ID="lblDecrypt" runat="server" Text="解密结果"></asp:Label>
    </div>
    </form>
</body>
</html>

public partial class Demo02_RSA1 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    //加密
    protected void btEncryption_Click(object sender, EventArgs e)
    {
        CspParameters param = new CspParameters();
        param.KeyContainerName = "gaojun"; //密匙容器的名称，保持加密解密一致才能解密成功
        
        RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(param);
        byte[] arrStart = Encoding.Default.GetBytes(this.txtEncryption.Text); //将要加密的字符串转换为字节数组
        byte[] arrEnd = rsa.Encrypt(arrStart, false);//将加密后的字节数据转换为新的加密字节数组
        this.lblEncryption.Text = Convert.ToBase64String(arrEnd);//将加密后的字节数组转换为字符串       
    }

    //解密
    protected void btDecrypt_Click(object sender, EventArgs e)
    {
        CspParameters param = new CspParameters();
        param.KeyContainerName = "gaojun";
        RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(param);
        byte[] arrStart = Convert.FromBase64String(this.txtDecrypt.Text);
        byte[] arrEnd = rsa.Decrypt(arrStart, false);
        this.lblDecrypt.Text = Encoding.Default.GetString(arrEnd);
    }
}

（2）RSA实现非对称加密

RSA特点：主要实现非对称加密。

生成钥匙：

0092.PNG
加密解密：

0093.PNG
xml文件保存私钥和公钥：

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:Button ID="btComputeKey" runat="server" Text="计算公钥秘钥" 
            onclick="btComputeKey_Click" />
        <asp:Label ID="lblKey" runat="server" Text="Label"></asp:Label>
    </div>
    </form>
</body>
</html>

public partial class Demo03_MakeKey : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }

    protected void btComputeKey_Click(object sender, EventArgs e)
    {
        string privateKeyPath = Server.MapPath("PrivateKey.xml"); //私钥保存位置
        string publicKeyPath = Server.MapPath("PublicKey.xml");   //公钥保存位置
        //创建RSA对象
        RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
        string privateKey = rsa.ToXmlString(true);
        string publicKey = rsa.ToXmlString(false);
        File.WriteAllText(privateKeyPath, privateKey);
        File.WriteAllText(publicKeyPath, publicKey);
        this.lblKey.Text = "公钥-私钥生成成功，保存在PublicKey.xml和PrivateKey.xml中";
    }
}

加密解密实现：

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <h3>双向不对称加密（加密解密钥匙不相同-RSA主要实现非对称加密，但这里也可以实现对称）</h3>
    <div>
        <asp:TextBox ID="txtEncryption" runat="server" Width="287px"></asp:TextBox>
        <asp:Button ID="btEncryption" runat="server" Text="使用PublicKey.xml文件内容为公钥进行加密" 
            onclick="btEncryption_Click" />
        <asp:Label ID="lblEncryption" runat="server" Text="加密结果"></asp:Label>
    </div>
    <br />
    <br />
    <div>
        <asp:TextBox ID="txtDecrypt" runat="server" Width="287px"></asp:TextBox>
        <asp:Button ID="btDecrypt" runat="server" Text="使用PrivateKey.xml文件内容为私钥解密" onclick="btDecrypt_Click" />
        <asp:Label ID="lblDecrypt" runat="server" Text="解密结果"></asp:Label>
    </div>
    </form>
</body>
</html>

public partial class Demo02_RSA2 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    
    //加密
    protected void btEncryption_Click(object sender, EventArgs e)
    {
        string publicKeyPath = Server.MapPath("PublicKey.xml");   //公钥保存位置
        string publicKey = File.ReadAllText(publicKeyPath);
        RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
        rsa.FromXmlString(publicKey);
        byte[] arrStart = Encoding.Default.GetBytes(this.txtEncryption.Text); //将要加密的字符串转换为字节数组
        byte[] arrEnd = rsa.Encrypt(arrStart, false);//将加密后的字节数据转换为新的加密字节数组
        this.lblEncryption.Text = Convert.ToBase64String(arrEnd);//将加密后的字节数组转换为字符串
    }

    //解密
    protected void btDecrypt_Click(object sender, EventArgs e)
    {
        string privateKeyPath = Server.MapPath("PrivateKey.xml"); //私钥保存位置
        string privateKey = File.ReadAllText(privateKeyPath);
        RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
        rsa.FromXmlString(privateKey);
        byte[] arrStart = Convert.FromBase64String(this.txtDecrypt.Text);
        byte[] arrEnd = rsa.Decrypt(arrStart, false);
        this.lblDecrypt.Text = Encoding.Default.GetString(arrEnd);
    }
}

14-加密

一、MD5加密

二、DES加密

三、RSA加密

（1）RSA实现对称加密

（2）RSA实现非对称加密

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