ASP.NET Tutorial/Development/Cryptography

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Cryptography.SHA1Managed

<%@ Page %>
<script Language="vb" runat="server">
Private Sub Page_Load(sender As Object, e As System.EventArgs)
   Dim clearText As String = "Try not.  Do.  Or do not.  There is no try."
   Dim encoder As New System.Text.UTF8Encoding()
   
   Response.Write(("Clear Text: " + clearText))
   Response.Write("<hr>")
   
   Dim sha As New System.Security.Cryptography.SHA1Managed()
   Dim input As Byte() = encoder.GetBytes(clearText)
   Dim output As Byte() = sha.ruputeHash(input)
   Response.Write(("Encrypted Text: " + encoder.GetString(output)))
End Sub
</script>


Decrypt / Encrypt

<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="Default_aspx" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:GridView ID="GridView1" runat="server" DataSourceID="SqlDataSource1" AutoGenerateColumns="False"
            DataKeyNames="au_id">
            <Columns>
                <asp:BoundField DataField="au_id" HeaderText="au_id" ReadOnly="True" SortExpression="au_id" />
                <asp:BoundField DataField="au_lname" HeaderText="au_lname" SortExpression="au_lname" />
                <asp:BoundField DataField="au_fname" HeaderText="au_fname" SortExpression="au_fname" />
                <asp:BoundField DataField="phone" HeaderText="phone" SortExpression="phone" />
                <asp:BoundField DataField="address" HeaderText="address" SortExpression="address" />
                <asp:BoundField DataField="city" HeaderText="city" SortExpression="city" />
                <asp:BoundField DataField="state" HeaderText="state" SortExpression="state" />
                <asp:BoundField DataField="zip" HeaderText="zip" SortExpression="zip" />
                <asp:CheckBoxField DataField="contract" HeaderText="contract" SortExpression="contract" />
            </Columns>
        </asp:GridView>
        <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:pubsConnectionString %>"
            SelectCommand="SELECT * FROM [authors]"></asp:SqlDataSource>
        &nbsp;
        <br />
    
    </div>
    </form>
</body>
</html>
File: Default.aspx.vb
Imports System.Configuration
"Imports System.Web
"Imports System.Web.Security
Imports System.Web.Security
Partial Class Default_aspx
    Inherits System.Web.UI.Page
    Protected Sub Page_Load(ByVal sender As Object, _
                            ByVal e As System.EventArgs) _
                            Handles Me.Load
        "Encrypt("DataProtectionConfigurationProvider")
        "--or--
        Decrypt()
        "Encrypt("RSAProtectedConfigurationProvider")
        " Decrypt()
        "AddConnString()
        "---retrieve the newly added string
        Dim connect As String = _
           ConfigurationManager.ConnectionStrings _
           ("PubsConnectionString").ConnectionString
        Response.Write(connect)
    End Sub

    Public Sub Encrypt(ByVal protectionProvider As String)
        Dim config As Configuration = _
           System.Web.Configuration.WebConfigurationManager.OpenWebConfiguration( _
           Request.ApplicationPath)
        Dim section As ConfigurationSection = config.Sections("connectionStrings")
        If Not section.SectionInformation.IsProtected Then
            section.SectionInformation.ProtectSection(protectionProvider)
            config.Save()
        End If
    End Sub
    Public Sub Decrypt()
        Dim config As Configuration = System.Web.Configuration.WebConfigurationManager.OpenWebConfiguration( _
           Request.ApplicationPath)
        Dim section As ConfigurationSection = config.Sections("connectionStrings")
        section.SectionInformation.UnProtectSection()
        config.Save()
    End Sub

    Public Sub AddConnString()
        Dim config As Configuration = System.Web.Configuration.WebConfigurationManager.OpenWebConfiguration( _
               Request.ApplicationPath)
        config.ConnectionStrings.ConnectionStrings.Add _
           (New ConnectionStringSettings("NorthwindConnectionString", _
           "server=localhost;database=northwind;integrated security=true"))
        config.Save()
       
    End Sub
End Class


Generate Keys

<%@ Page Language="C#" %>
<%@ Import Namespace="System.Security.Cryptography" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
    void Page_Load()
    {
        lblAES.Text = GetSequence(64);
        lblSHA1.Text = GetSequence(128);
    }
    private string GetSequence(int length)
    {
        byte[] buffer = new byte[length/2];
        RNGCryptoServiceProvider provider = new RNGCryptoServiceProvider();
        provider.GetBytes(buffer);
        StringBuilder builder = new StringBuilder(length);
        for (int i = 0; i < buffer.Length; i++)
            builder.Append(string.Format("{0:X2}", buffer[i]));
        return builder.ToString();
    }
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Generate Keys</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    AES:
    <asp:Label
        id="lblAES"
        Runat="server" />
    <br /><br />
    SHA1:
    <asp:Label
        id="lblSHA1"
        Runat="server" />
    </div>
    </form>
</body>
</html>
Источник — «http://nfex.ru/index.php?title=ASP.NET_Tutorial/Development/Cryptography&oldid=2580»