в 15:30, 26 мая 2010

2010-05-26T15:30:57Z

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2010-05-26T11:56:21Z

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== Cryptography.SHA1Managed==



<source lang="csharp">
<%@ 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></source>

== Decrypt / Encrypt==



<source lang="csharp">
<%@ 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>
 
<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</source>

== Generate Keys==



<source lang="csharp">
<%@ 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></source>

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