RSA加密

    <div>
        <asp:Button ID="btnBuildKey" runat="server" Text="生成密钥" 
            onclick="btnBuildKey_Click" />
        <br />
        <br />
        <asp:TextBox ID="txtData" runat="server"></asp:TextBox>
        <br />
        <asp:Button ID="btnEnCrypt" runat="server" Text="加密" 
            onclick="btnEnCrypt_Click" />
        <br />
        <asp:Label ID="lblEnCryptData" runat="server" Text="加密后的数据" BackColor="AliceBlue"></asp:Label>
        <br />
        <asp:Button ID="btnDeCrypt" runat="server" Text="解密" 
            onclick="btnDeCrypt_Click" />
        <br />
        <asp:Label ID="lblData" runat="server" Text="原始数据"></asp:Label>
    </div>

 

    protected void btnEnCrypt_Click(object sender, EventArgs e)
    {
        RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
        System.Xml.XmlDocument doc = new System.Xml.XmlDocument();
        doc.Load(Server.MapPath("rsaPublicKey.xml"));
        rsa.FromXmlString(doc.OuterXml);
        byte[] PlainTextBArray = (new UnicodeEncoding()).GetBytes(txtData.Text.Trim());
        byte[] CypherTextBArray = rsa.Encrypt(PlainTextBArray, false);
        string strResult = Convert.ToBase64String(CypherTextBArray);
        lblEnCryptData.Text = strResult;
    }

    protected void btnDeCrypt_Click(object sender, EventArgs e)
    {
        RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
        System.Xml.XmlDocument doc = new System.Xml.XmlDocument();
        doc.Load(Server.MapPath("rsaPrivateKey.xml"));
        rsa.FromXmlString(doc.OuterXml);
        byte[] PlainTextBArray = Convert.FromBase64String(lblEnCryptData.Text);
        byte[] DypherTextBArray = rsa.Decrypt(PlainTextBArray, false);
        string strResult = (new UnicodeEncoding()).GetString(DypherTextBArray);
        lblData.Text = strResult;
    }
    protected void btnBuildKey_Click(object sender, EventArgs e)
    {
        RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
        string strPrivateKey = rsa.ToXmlString(false);
        System.Xml.XmlDocument doc = new System.Xml.XmlDocument();
        doc.LoadXml(strPrivateKey);
        doc.Save(Server.MapPath("rsaPublicKey.xml"));

        string strPublicKey = rsa.ToXmlString(true);
        doc = new System.Xml.XmlDocument();
        doc.LoadXml(strPublicKey);
        doc.Save(Server.MapPath("rsaPrivateKey.xml"));
    }