AsymmetricAlgorithm Класс
Определение
Важно!
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Представляет абстрактный базовый класс, от которого должны наследоваться все реализации алгоритмов асимметричного шифрования.
public ref class AsymmetricAlgorithm abstract : IDisposablepublic abstract class AsymmetricAlgorithm : IDisposable[System.Runtime.InteropServices.ComVisible(true)]
public abstract class AsymmetricAlgorithm : IDisposabletype AsymmetricAlgorithm = class
interface IDisposable[<System.Runtime.InteropServices.ComVisible(true)>]
type AsymmetricAlgorithm = class
interface IDisposablePublic MustInherit Class AsymmetricAlgorithm
Implements IDisposable- Наследование
-
AsymmetricAlgorithm
- Производный
- Атрибуты
- Реализации
Примеры
В следующем примере кода показано, как реализовать пользовательский асимметричный алгоритм, AsymmetricAlgorithm унаследованный от класса . Для демонстрации использования пользовательского класса предоставляется дополнительный класс.
#using <System.Xml.dll>
#using <System.Security.dll>
using namespace System;
using namespace System::Xml;
using namespace System::Text;
using namespace System::Security::Cryptography;
using namespace System::Reflection;
[assembly: AssemblyKeyFile("CustomCrypto.snk")];
[assembly: AssemblyVersion("1.0.0.0")];
[assembly: CLSCompliant(true)];
namespace Contoso
{
// Define a CustomCrypto class that inherits from the AsymmetricAlgorithm
// class.
public ref class CustomCrypto :
public System::Security::Cryptography::AsymmetricAlgorithm
{
// Declare local member variables.
private:
CspParameters^ cryptoServiceParameters;
array<KeySizes^>^ customValidKeySizes;
// Initialize a CustomCrypto with the default key size of 8.
public:
CustomCrypto()
{
customValidKeySizes =
gcnew array<KeySizes^>{gcnew KeySizes(8, 64, 8)};
this->KeySize = 8;
}
// Initialize a CustomCrypto with the specified key size.
public:
CustomCrypto(int keySize)
{
customValidKeySizes =
gcnew array<KeySizes^>{gcnew KeySizes(8, 64, 8)};
this->KeySize = keySize;
}
// Accessor function for keySizes member variable.
public:
property array<KeySizes^>^ LegalKeySizes
{
virtual array<KeySizes^>^ get() override
{
return (array<KeySizes^>^)customValidKeySizes->Clone();
}
}
// Modify the KeySizeValue property inherited from the Asymmetric
// class. Prior to setting the value, ensure it falls within the
// range identified in the local keySizes member variable.
public:
property int KeySize
{
virtual int get() override
{
return KeySizeValue;
}
virtual void set(int value) override
{
for (int i = 0; i < customValidKeySizes->Length; i++)
{
if (customValidKeySizes[i]->SkipSize == 0)
{
if (customValidKeySizes[i]->MinSize == value)
{
KeySizeValue = value;
return;
}
}
else
{
for (int j = customValidKeySizes[i]->MinSize;
j <= customValidKeySizes[i]->MaxSize;
j += customValidKeySizes[i]->SkipSize)
{
if (j == value)
{
KeySizeValue = value;
return;
}
}
}
}
// If the key does not fall within the range identified
// in the keySizes member variable, throw an exception.
throw gcnew CryptographicException("Invalid key size.");
}
}
// Initialize the parameters with default values.
public:
void InitializeParameters()
{
cryptoServiceParameters = gcnew CspParameters();
cryptoServiceParameters->ProviderName = "Contoso";
cryptoServiceParameters->KeyContainerName = "SecurityBin1";
cryptoServiceParameters->KeyNumber = 1;
cryptoServiceParameters->ProviderType = 2;
}
// Parse specified xmlString for values to populate the CspParams
// Expected XML schema:
// <ProviderName></ProviderName>
// <KeyContainerName></KeyContainerName>
// <KeyNumber></KeyNumber>
// <ProviderType></ProviderType>
public:
virtual void FromXmlString(String^ xmlString) override
{
if (xmlString != nullptr)
{
XmlDocument^ document = gcnew XmlDocument();
document->LoadXml(xmlString);
XmlNode^ firstNode = document->FirstChild;
XmlNodeList^ nodeList;
// Assemble parameters from values in each XML element.
cryptoServiceParameters = gcnew CspParameters();
// KeyContainerName is optional.
nodeList =
document->GetElementsByTagName("KeyContainerName");
if (nodeList->Count > 0)
{
cryptoServiceParameters->KeyContainerName =
nodeList->Item(0)->InnerText;
}
// KeyNumber is optional.
nodeList = document->GetElementsByTagName("KeyNumber");
if (nodeList->Count > 0)
{
cryptoServiceParameters->KeyNumber =
Int32::Parse(nodeList->Item(0)->InnerText);
}
// ProviderName is optional.
nodeList = document->GetElementsByTagName("ProviderName");
if (nodeList->Count > 0)
{
cryptoServiceParameters->ProviderName =
nodeList->Item(0)->InnerText;
}
// ProviderType is optional.
nodeList = document->GetElementsByTagName("ProviderType");
if (nodeList->Count > 0)
{
cryptoServiceParameters->ProviderType =
Int32::Parse(nodeList->Item(0)->InnerText);
}
}
else
{
throw gcnew ArgumentNullException("xmlString");
}
}
// Create an XML string representation of the parameters in the
// current customCrypto object.
public:
virtual String^ ToXmlString(bool includePrivateParameters) override
{
String^ keyContainerName = "";
String^ keyNumber = "";
String^ providerName = "";
String^ providerType = "";
if (cryptoServiceParameters != nullptr)
{
keyContainerName =
cryptoServiceParameters->KeyContainerName;
keyNumber = cryptoServiceParameters->KeyNumber.ToString();
providerName = cryptoServiceParameters->ProviderName;
providerType =
cryptoServiceParameters->ProviderType.ToString();
}
StringBuilder^ sb = gcnew StringBuilder();
sb->Append("<CustomCryptoKeyValue>");
sb->Append("<KeyContainerName>");
sb->Append(keyContainerName);
sb->Append("</KeyContainerName>");
sb->Append("<KeyNumber>");
sb->Append(keyNumber);
sb->Append("</KeyNumber>");
sb->Append("<ProviderName>");
sb->Append(providerName);
sb->Append("</ProviderName>");
sb->Append("<ProviderType>");
sb->Append(providerType);
sb->Append("</ProviderType>");
sb->Append("</CustomCryptoKeyValue>");
return(sb->ToString());
}
// Return the name for the key exchange algorithm.
public:
property String^ KeyExchangeAlgorithm
{
virtual String^ get() override
{
return "RSA-PKCS1-KeyEx";
}
}
// Retrieves the name of the signature alogrithm.
// This example uses the SHA1 algorithm.
// Due to collision problems with SHA1, Microsoft recommends SHA256 or better.
public:
property String^ SignatureAlgorithm
{
virtual String^ get() override
{
return "http://www.w3.org/2000/09/xmldsig#rsa-sha1";
}
}
// Required member for implementing the AsymmetricAlgorithm class.
protected:
virtual ~CustomCrypto()
{
}
// Call the Create method using the CustomCrypto assembly name.
// The create function attempts to create a CustomCrypto
// object using the assembly name. This functionality requires
// modification of the machine.config file. Add the following
// section to the configuration element and modify the values
// of the cryptoClass to reflect what isinstalled
// in your machines GAC.
// <cryptoClass CustomCrypto="Contoso.CustomCrypto,
// CustomCrypto,
// Culture=neutral,
// PublicKeyToken=fdb9f9c4851028bf,
// Version=1.0.1448.27640" />
// <nameEntry name="Contoso.CustomCrypto"
// class="CustomCrypto" />
// <nameEntry name="CustomCrypto" class="CustomCrypto" />
public:
static CustomCrypto^ Create()
{
return Create("CustomCrypto");
}
// Create a CustomCrypto object by calling CrytoConfig's
// CreateFromName method and casting the type to CustomCrypto.
// The create function attempts to create a CustomCrypto object
// using the assembly name. This functionality requires
// modification of the machine.config file. Add the following
// section to the configuration element and modify the values
// of the cryptoClass to reflect what is installed
// in your machines GAC.
// <cryptoClass CustomCrypto="Contoso.CustomCrypto,
// CustomCrypto,
// Culture=neutral,
// PublicKeyToken=fdb9f9c4851028bf,
// Version=1.0.1448.27640" />
// <nameEntry name="Contoso.CustomCrypto"
// class="CustomCrypto" />
// <nameEntry name="CustomCrypto" class="CustomCrypto" />
public:
static CustomCrypto^ Create(String^ algorithmName)
{
return (CustomCrypto^)
CryptoConfig::CreateFromName(algorithmName);
}
};
}
using System;
using System.Xml;
using System.Text;
using System.Security.Cryptography;
using System.Reflection;
[assembly: AssemblyKeyFile("CustomCrypto.snk")]
[assembly: AssemblyVersion("1.0.0.0")]
[assembly: CLSCompliant(true)]
namespace Contoso
{
// Define a CustomCrypto class that inherits from the AsymmetricAlgorithm
// class.
public class CustomCrypto :
System.Security.Cryptography.AsymmetricAlgorithm
{
// Declare local member variables.
private CspParameters cspParameters;
private readonly KeySizes[] keySizes = {new KeySizes(8, 64, 8)};
// Initialize a CustomCrypto with the default key size of 8.
public CustomCrypto()
{
this.KeySize = 8;
}
// Initialize a CustomCrypto with the specified key size.
public CustomCrypto(int keySize)
{
this.KeySize = keySize;
}
// Accessor function for keySizes member variable.
public override KeySizes[] LegalKeySizes
{
get { return (KeySizes[])keySizes.Clone(); }
}
// Modify the KeySizeValue property inherited from the Asymmetric
// class. Prior to setting the value, ensure it falls within the
// range identified in the local keySizes member variable.
public override int KeySize
{
get { return KeySizeValue; }
set
{
for (int i=0; i < keySizes.Length; i++)
{
if (keySizes[i].SkipSize == 0)
{
if (keySizes[i].MinSize == value)
{
KeySizeValue = value;
return;
}
}
else
{
for (int j = keySizes[i].MinSize;
j <= keySizes[i].MaxSize;
j += keySizes[i].SkipSize)
{
if (j == value)
{
KeySizeValue = value;
return;
}
}
}
}
// If the key does not fall within the range identified
// in the keySizes member variable, throw an exception.
throw new CryptographicException("Invalid key size.");
}
}
// Initialize the parameters with default values.
public void InitializeParameters()
{
cspParameters = new CspParameters();
cspParameters.ProviderName = "Contoso";
cspParameters.KeyContainerName = "SecurityBin1";
cspParameters.KeyNumber = 1;
cspParameters.ProviderType = 2;
}
// Parse specified xmlString for values to populate the CspParams
// Expected XML schema:
// <ProviderName></ProviderName>
// <KeyContainerName></KeyContainerName>
// <KeyNumber></KeyNumber>
// <ProviderType></ProviderType>
public override void FromXmlString(string xmlString)
{
if (xmlString != null)
{
XmlDocument doc = new XmlDocument();
doc.LoadXml(xmlString);
XmlNode firstNode = doc.FirstChild;
XmlNodeList nodeList;
// Assemble parameters from values in each XML element.
cspParameters = new CspParameters();
// KeyContainerName is optional.
nodeList = doc.GetElementsByTagName("KeyContainerName");
string keyName = nodeList.Item(0).InnerText;
if (keyName != null)
{
cspParameters.KeyContainerName = keyName;
}
// KeyNumber is optional.
nodeList = doc.GetElementsByTagName("KeyNumber");
string keyNumber = nodeList.Item(0).InnerText;
if (keyNumber != null)
{
cspParameters.KeyNumber = Int32.Parse(keyNumber);
}
// ProviderName is optional.
nodeList = doc.GetElementsByTagName("ProviderName");
string providerName = nodeList.Item(0).InnerText;
if (providerName != null)
{
cspParameters.ProviderName = providerName;
}
// ProviderType is optional.
nodeList = doc.GetElementsByTagName("ProviderType");
string providerType = nodeList.Item(0).InnerText;
if (providerType != null)
{
cspParameters.ProviderType = Int32.Parse(providerType);
}
}
else
{
throw new ArgumentNullException("xmlString");
}
}
// Create an XML string representation of the parameters in the
// current customCrypto object.
public override string ToXmlString(bool includePrivateParameters)
{
string keyContainerName = "";
string keyNumber = "";
string providerName = "";
string providerType = "";
if (cspParameters != null)
{
keyContainerName = cspParameters.KeyContainerName;
keyNumber = cspParameters.KeyNumber.ToString();
providerName = cspParameters.ProviderName;
providerType = cspParameters.ProviderType.ToString();
}
StringBuilder sb = new StringBuilder();
sb.Append("<CustomCryptoKeyValue>");
sb.Append("<KeyContainerName>");
sb.Append(keyContainerName);
sb.Append("</KeyContainerName>");
sb.Append("<KeyNumber>");
sb.Append(keyNumber);
sb.Append("</KeyNumber>");
sb.Append("<ProviderName>");
sb.Append(providerName);
sb.Append("</ProviderName>");
sb.Append("<ProviderType>");
sb.Append(providerType);
sb.Append("</ProviderType>");
sb.Append("</CustomCryptoKeyValue>");
return(sb.ToString());
}
// Return the name for the key exchange algorithm.
public override string KeyExchangeAlgorithm
{
get {return "RSA-PKCS1-KeyEx";}
}
// Retrieves the name of the signature alogrithm.
// This example uses the SHA1 algorithm.
// Due to collision problems with SHA1, Microsoft recommends SHA256 or better.
public override string SignatureAlgorithm
{
get {return "http://www.w3.org/2000/09/xmldsig#rsa-sha1";}
}
// Required member for implementing the AsymmetricAlgorithm class.
protected override void Dispose(bool disposing) {}
// Call the Create method using the CustomCrypto assembly name.
// The create function attempts to create a CustomCrypto object using
// the assembly name. This functionality requires modification of the
// machine.config file. Add the following section to the configuration
// element and modify the values of the cryptoClass to reflect what is
// installed in your machines GAC.
// <cryptoClass CustomCrypto="Contoso.CustomCrypto,
// CustomCrypto,
// Culture=neutral,
// PublicKeyToken=fdb9f9c4851028bf,
// Version=1.0.1448.27640" />
// <nameEntry name="Contoso.CustomCrypto" class="CustomCrypto" />
// <nameEntry name="CustomCrypto" class="CustomCrypto" />
new static public CustomCrypto Create()
{
return Create("CustomCrypto");
}
// Create a CustomCrypto object by calling CrytoConfig's
// CreateFromName method and casting the type to CustomCrypto.
// The create function attempts to create a CustomCrypto object using
// the assembly name. This functionality requires modification of the
// machine.config file. Add the following section to the configuration
// element and modify the values of the cryptoClass to reflect what is
// installed in your machines GAC.
// <cryptoClass CustomCrypto="Contoso.CustomCrypto,
// CustomCrypto,
// Culture=neutral,
// PublicKeyToken=fdb9f9c4851028bf,
// Version=1.0.1448.27640" />
// <nameEntry name="Contoso.CustomCrypto" class="CustomCrypto" />
// <nameEntry name="CustomCrypto" class="CustomCrypto" />
new static public CustomCrypto Create(String algorithmName)
{
return (CustomCrypto) CryptoConfig.CreateFromName(algorithmName);
}
}
class CustomCryptoImpl
{
[STAThread]
static void Main(string[] args)
{
// Construct a CustomCrypto object and initialize its
// CspParameters.
CustomCrypto customCrypto = new CustomCrypto();
customCrypto.InitializeParameters();
// Display properties of the current customCrypto object.
Console.WriteLine("*** CustomCrypto created with default " +
"parameters:");
DisplayProperties(customCrypto);
// Release all the resources used by this instance of
// CustomCrytpo.
customCrypto.Clear();
customCrypto = new CustomCrypto(64);
// Create new parameters and set them by using the FromXmlString
// method.
string parameterXml = "<CustomCryptoKeyValue>";
parameterXml += "<ProviderName>Contoso</ProviderName>";
parameterXml += "<KeyContainerName>SecurityBin2";
parameterXml += "</KeyContainerName>";
parameterXml += "<KeyNumber>1</KeyNumber>";
parameterXml += "<ProviderType>2</ProviderType>";
parameterXml += "</CustomCryptoKeyValue>";
customCrypto.FromXmlString(parameterXml);
// Display the properties of a customCrypto object created with
// custom parameters.
Console.WriteLine("\n*** " +
"CustomCrypto created with custom parameters:");
DisplayProperties(customCrypto);
// Create an object by using the assembly name.
try
{
CustomCrypto myCryptoA = CustomCrypto.Create("CustomCrypto");
if (myCryptoA != null)
{
Console.Write("\n*** " +
"Successfully created CustomCrytpo from");
Console.WriteLine(" the Create method.");
DisplayProperties(myCryptoA);
}
else
{
Console.Write("Unable to create CustomCrytpo from ");
Console.WriteLine(" the Create method.");
}
}
catch (Exception ex)
{
Console.WriteLine(ex.ToString());
}
Console.WriteLine("This sample completed successfully; " +
"press Enter to exit.");
Console.ReadLine();
}
// Display the properties of the specified CustomCrypto object to the
// console.
public static void DisplayProperties(CustomCrypto customCrypto)
{
try
{
// Retrieve the class description for the customCrypto object.
string classDescription = customCrypto.ToString();
Console.WriteLine(classDescription);
Console.Write("KeyExchangeAlgorithm: ");
Console.WriteLine(customCrypto.KeyExchangeAlgorithm);
Console.Write("SignatureAlgorithm: ");
Console.WriteLine(customCrypto.SignatureAlgorithm);
Console.WriteLine("KeySize: " + customCrypto.KeySize);
Console.WriteLine("Parameters described in Xml format:");
Console.WriteLine(customCrypto.ToXmlString(true));
// Display the MinSize, MaxSize, and SkipSize properties of
// each KeySize item in the local keySizes member variable.
KeySizes[] legalKeySizes = customCrypto.LegalKeySizes;
if (legalKeySizes.Length > 0)
{
for (int i=0; i < legalKeySizes.Length; i++)
{
Console.Write("Keysize" + i + " min, max, step: ");
Console.Write(legalKeySizes[i].MinSize + ", ");
Console.Write(legalKeySizes[i].MaxSize + ", ");
Console.WriteLine(legalKeySizes[i].SkipSize + ", ");
}
}
}
catch (Exception ex)
{
Console.WriteLine("Caught unexpected exception: " +
ex.ToString());
}
}
}
}
//
// This sample produces the following output:
//
// *** CustomCrypto created with default parameters:
// Contoso.vbCustomCrypto
// KeyExchangeAlgorithm: RSA-PKCS1-KeyEx
// SignatureAlgorithm: http://www.w3.org/2000/09/xmldsig#rsa-sha1
// KeySize: 8
// Parameters described in Xml format:
// <CustomCryptoKeyValue><KeyContainerName>SecurityBin1</KeyContainerName>
// <KeyNumber>1</KeyNumber><ProviderName>Contoso</ProviderName>
// <ProviderType>2</ProviderType></CustomCryptoKeyValue>
// Keysize0 min, max, step: 8, 64, 8,
//
// *** CustomCrypto created with custom parameters:
// Contoso.vbCustomCrypto
// KeyExchangeAlgorithm: RSA-PKCS1-KeyEx
// SignatureAlgorithm: http://www.w3.org/2000/09/xmldsig#rsa-sha1
// KeySize: 64
// Parameters described in Xml format:
// <CustomCryptoKeyValue><KeyContainerName>SecurityBin2</KeyContainerName>
// <KeyNumber>1</KeyNumber><ProviderName>Contoso</ProviderName>
// <ProviderType>2</ProviderType></CustomCryptoKeyValue>
// Keysize0 min, max, step: 8, 64, 8,
// Unable to create CustomCrytpo from the Create method
// This sample completed successfully; press Exit to continue.
Imports System.Xml
Imports System.Text
Imports System.Security.Cryptography
Imports System.Reflection
<Assembly: AssemblyKeyFile("CustomCrypto.snk")>
<Assembly: AssemblyVersion("1.0.0.0")>
<Assembly: CLSCompliant(True)>
Namespace Contoso
' Define a vbCustomCrypto class that inherits from the AsymmetricAlgorithm
' class.
Class vbCustomCrypto
Inherits System.Security.Cryptography.AsymmetricAlgorithm
' Declare local member variables.
Private cspParameters As CspParameters
Private ReadOnly keySizes() As keySizes = {New keySizes(8, 64, 8)}
' Initialize a vbCustomCrypto with the default key size of 8.
Public Sub New()
Me.KeySize = 8
End Sub
' Initialize a vbCustomCrypto with the specified key size.
Public Sub New(ByVal keySize As Integer)
Me.KeySize = keySize
End Sub
' Modify the KeySizeValue property inherited from the Asymmetric
' class. Prior to setting the value, ensure it falls within the
' range identified in the local keySizes member variable.
Public Overrides Property KeySize() As Integer
Get
Return KeySizeValue
End Get
Set(ByVal Value As Integer)
For i As Int16 = 0 To keySizes.Length - 1 Step i
If (keySizes(i).SkipSize.Equals(0)) Then
If (keySizes(i).MinSize.Equals(Value)) Then
KeySizeValue = Value
Return
End If
Else
For j As Integer = keySizes(i).MinSize _
To keySizes(i).MaxSize _
Step keySizes(i).SkipSize
If (j.Equals(Value)) Then
KeySizeValue = Value
Return
End If
Next
End If
Next
' If the key does not fall within the range identified
' in the keySizes member variable, throw an exception.
Throw New CryptographicException("Invalid key size.")
End Set
End Property
' Accessor function for keySizes member variable.
public Overrides Readonly Property LegalKeySizes as KeySizes()
Get
Return keySizes
End Get
End Property
' Initialize the parameters with default values.
Public Sub InitializeParameters()
cspParameters = New CspParameters
cspParameters.ProviderName = "Contoso"
cspParameters.KeyContainerName = "SecurityBin1"
cspParameters.KeyNumber = 1
cspParameters.ProviderType = 2
End Sub
' Parse specified xmlString for values to populate the CspParams
' Expected XML schema:
' <ProviderName></ProviderName>
' <KeyContainerName></KeyContainerName>
' <KeyNumber></KeyNumber>
' <ProviderType></ProviderType>
Public Overrides Sub FromXmlString(ByVal xmlString As String)
If Not xmlString Is Nothing Then
Dim doc As New XmlDocument
doc.LoadXml(xmlString)
Dim firstNode As XmlNode = doc.FirstChild
Dim nodeList As XmlNodeList
' Assemble parameters from values in each XML element.
cspParameters = New CspParameters
' KeyContainerName is optional.
nodeList = doc.GetElementsByTagName("KeyContainerName")
Dim keyName As String = nodeList.Item(0).InnerText
If Not keyName Is Nothing Then
cspParameters.KeyContainerName = keyName
End If
' KeyNumber is optional.
nodeList = doc.GetElementsByTagName("KeyNumber")
Dim keyNumber As String = nodeList.Item(0).InnerText
If Not keyNumber Is Nothing Then
cspParameters.KeyNumber = Int32.Parse(keyNumber)
End If
' ProviderName is optional.
nodeList = doc.GetElementsByTagName("ProviderName")
Dim providerName As String = nodeList.Item(0).InnerText
If Not providerName Is Nothing Then
cspParameters.ProviderName = providerName
End If
' ProviderType is optional.
nodeList = doc.GetElementsByTagName("ProviderType")
Dim providerType As String = nodeList.Item(0).InnerText
If Not providerType Is Nothing Then
cspParameters.ProviderType = Int32.Parse(providerType)
End If
Else
Throw New ArgumentNullException("xmlString")
End If
End Sub
' Create an XML string representation of the parameters in the current
' vbCustomCrypto object.
Public Overrides Function ToXmlString( _
ByVal includePrivateParameters As Boolean) As String
Dim keyContainerName As String = ""
Dim keyNumber As String = ""
Dim providerName As String = ""
Dim providerType As String = ""
If Not cspParameters Is Nothing Then
keyContainerName = cspParameters.KeyContainerName
keyNumber = cspParameters.KeyNumber.ToString()
providerName = cspParameters.ProviderName
providerType = cspParameters.ProviderType.ToString()
End If
Dim xmlBuilder As New StringBuilder
xmlBuilder.Append("<CustomCryptoKeyValue>")
xmlBuilder.Append("<KeyContainerName>")
xmlBuilder.Append(keyContainerName)
xmlBuilder.Append("</KeyContainerName>")
xmlBuilder.Append("<KeyNumber>")
xmlBuilder.Append(keyNumber)
xmlBuilder.Append("</KeyNumber>")
xmlBuilder.Append("<ProviderName>")
xmlBuilder.Append(providerName)
xmlBuilder.Append("</ProviderName>")
xmlBuilder.Append("<ProviderType>")
xmlBuilder.Append(providerType)
xmlBuilder.Append("</ProviderType>")
xmlBuilder.Append("</CustomCryptoKeyValue>")
Return (xmlBuilder.ToString())
End Function
' Return the name for the key exchange algorithm.
Public Overrides ReadOnly Property KeyExchangeAlgorithm() As String
Get
Return "RSA-PKCS1-KeyEx"
End Get
End Property
' Retrieves the name of the signature alogrithm.
' This example uses the SHA1 algorithm.
' Due to collision problems with SHA1, Microsoft recommends SHA256 or better.
Public Overrides ReadOnly Property SignatureAlgorithm() As String
Get
Return "http://www.w3.org/2000/09/xmldsig#rsa-sha1"
End Get
End Property
' Required member for implementing the AsymmetricAlgorithm class.
Protected Overrides Sub Dispose(ByVal disposing As Boolean)
End Sub
' The create function attempts to create a vbCustomCrypto object using
' the assembly name. This functionality requires modification of the
' machine.config file. Add the following section to the configuration
' element and modify the values of the cryptoClass to reflect what is
' installed in your machines GAC.
' <cryptoClass vbCustomCrypto="Contoso.vbCustomCrypto,
' vbCustomCrypto,
' Culture=neutral,
' PublicKeyToken=fdb9f9c4851028bf,
' Version=1.0.1448.27640" />
' <nameEntry name="Contoso.vbCustomCrypto"
' class="vbCustomCrypto" />
' <nameEntry name="vbCustomCrypto" class="vbCustomCrypto" />
Public Shadows Function Create() As vbCustomCrypto
Return Create("vbCustomCrypto")
End Function
' Create a CustomCrypto object by calling CrytoConfig's
' CreateFromName method and casting the type to CustomCrypto.
' The create function attempts to create a vbCustomCrypto object using
' the assembly name. This functionality requires modification of the
' machine.config file. Add the following section to the configuration
' element and modify the values of the cryptoClass to reflect what is
' installed in your machines GAC.
' <cryptoClass vbCustomCrypto="Contoso.vbCustomCrypto,
' vbCustomCrypto,
' Culture=neutral,
' PublicKeyToken=fdb9f9c4851028bf,
' Version=1.0.1448.27640" />
' <nameEntry name="Contoso.vbCustomCrypto"
' class="vbCustomCrypto" />
' <nameEntry name="vbCustomCrypto" class="vbCustomCrypto" />
Public Shadows Function Create( _
ByVal algorithmName As String) As vbCustomCrypto
Return CType( _
CryptoConfig.CreateFromName(algorithmName), _
vbCustomCrypto)
End Function
End Class
Class Form1
Inherits System.Windows.Forms.Form
' Event handler for Run button.
Private Sub Button1_Click( _
ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles Button1.Click
tbxOutput.Cursor = Cursors.WaitCursor
tbxOutput.Text = ""
' Construct a CustomCrypto object and initialize its
' CspParameters.
Dim customCrypto As New Contoso.vbCustomCrypto
customCrypto.InitializeParameters()
' Display properties of the current vbCustomCrypto object.
WriteLine("*** CustomCrypto created with default parameters:")
DisplayProperties(customCrypto)
' Release all the resources used by this instance of CustomCrytpo.
customCrypto.Clear()
customCrypto = New Contoso.vbCustomCrypto(64)
' Create new parameters and set them by using the
' FromXmlString method.
Dim parameterXml As String = "<CustomCryptoKeyValue>"
parameterXml += "<ProviderName>Contoso</ProviderName>"
parameterXml += "<KeyContainerName>SecurityBin2"
parameterXml += "</KeyContainerName>"
parameterXml += "<KeyNumber>1</KeyNumber>"
parameterXml += "<ProviderType>2</ProviderType>"
parameterXml += "</CustomCryptoKeyValue>"
customCrypto.FromXmlString(parameterXml)
' Display the properties of a customCrypto object created with
' custom parameters.
WriteLine(vbCrLf + "*** " + _
"CustomCrypto created with custom parameters:")
DisplayProperties(customCrypto)
' Create an object by using the assembly name.
Try
Dim createdCrypto As Contoso.vbCustomCrypto
createdCrypto = customCrypto.Create("vbCustomCrypto")
If (Not createdCrypto Is Nothing) Then
Write(vbCrLf + "*** Successfully created vbCustomCrytpo ")
WriteLine("from the Create method.")
DisplayProperties(createdCrypto)
Else
Write("Unable to create CustomCrytpo from ")
WriteLine(" the Create method.")
End If
Catch ex As Exception
WriteLine(ex.ToString())
End Try
' Align interface and conclude application.
WriteLine("This sample completed successfully;" + _
" press Exit to continue.")
' Reset the cursor.
tbxOutput.Cursor = Cursors.Default
End Sub
' Display the properties of the specified CustomCrypto object to
' the output texbox.
Public Sub DisplayProperties( _
ByVal customCrypto As Contoso.vbCustomCrypto)
Try
' Retrieve the class description for the customCrypto object.
Dim classDescription As String = customCrypto.ToString()
WriteLine(classDescription)
WriteLine("KeyExchangeAlgorithm: " + _
customCrypto.KeyExchangeAlgorithm)
WriteLine("SignatureAlgorithm: " + _
customCrypto.SignatureAlgorithm)
WriteLine("KeySize: " + customCrypto.KeySize.ToString())
WriteLine("Parameters described in Xml format:")
WriteLine(customCrypto.ToXmlString(True))
' Display the MinSize, MaxSize, and SkipSize properties of
' each KeySize item in the local keySizes member variable.
Dim legalKeySizes() As KeySizes = customCrypto.LegalKeySizes
If (legalKeySizes.Length > 0) Then
For i As Integer = 0 To legalKeySizes.Length - 1 Step 1
Write("Keysize" + i.ToString() + " min, max, step: ")
Write(legalKeySizes(i).MinSize.ToString() + ", ")
Write(legalKeySizes(i).MaxSize.ToString() + ", ")
Write(legalKeySizes(i).SkipSize.ToString() + ", ")
WriteLine("")
Next
End If
Catch ex As Exception
WriteLine("Caught unexpected exception: " + ex.ToString())
End Try
End Sub
' Write the specified message and carriage return to the output
' textbox.
Private Sub WriteLine(ByVal message As String)
tbxOutput.AppendText(message + vbCrLf)
End Sub
' Write the specified message to the output textbox.
Private Sub Write(ByVal message As String)
tbxOutput.AppendText(message)
End Sub
' Event handler for Exit button.
Private Sub Button2_Click( _
ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles Button2.Click
Application.Exit()
End Sub
Public Sub New()
MyBase.New()
'This call is required by the Windows Form Designer.
InitializeComponent()
'Add any initialization after the InitializeComponent() call
End Sub
'Form overrides dispose to clean up the component list.
Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
If disposing Then
If Not (components Is Nothing) Then
components.Dispose()
End If
End If
MyBase.Dispose(disposing)
End Sub
'Required by the Windows Form Designer
Private components As System.ComponentModel.IContainer
'NOTE: The following procedure is required by the Windows Form
'Designer. It can be modified using the Windows Form Designer.
'Do not modify it using the code editor.
Friend WithEvents Panel2 As System.Windows.Forms.Panel
Friend WithEvents Panel1 As System.Windows.Forms.Panel
Friend WithEvents Button1 As System.Windows.Forms.Button
Friend WithEvents Button2 As System.Windows.Forms.Button
Friend WithEvents tbxOutput As System.Windows.Forms.RichTextBox
<System.Diagnostics.DebuggerStepThrough()> _
Private Sub InitializeComponent()
Me.Panel2 = New System.Windows.Forms.Panel
Me.Button1 = New System.Windows.Forms.Button
Me.Button2 = New System.Windows.Forms.Button
Me.Panel1 = New System.Windows.Forms.Panel
Me.tbxOutput = New System.Windows.Forms.RichTextBox
Me.Panel2.SuspendLayout()
Me.Panel1.SuspendLayout()
Me.SuspendLayout()
'
'Panel2
'
Me.Panel2.Controls.Add(Me.Button1)
Me.Panel2.Controls.Add(Me.Button2)
Me.Panel2.Dock = System.Windows.Forms.DockStyle.Bottom
Me.Panel2.DockPadding.All = 20
Me.Panel2.Location = New System.Drawing.Point(0, 320)
Me.Panel2.Name = "Panel2"
Me.Panel2.Size = New System.Drawing.Size(616, 64)
Me.Panel2.TabIndex = 1
'
'Button1
'
Me.Button1.Dock = System.Windows.Forms.DockStyle.Right
Me.Button1.Font = New System.Drawing.Font( _
"Microsoft Sans Serif", _
9.0!, _
System.Drawing.FontStyle.Regular, _
System.Drawing.GraphicsUnit.Point, _
CType(0, Byte))
Me.Button1.Location = New System.Drawing.Point(446, 20)
Me.Button1.Name = "Button1"
Me.Button1.Size = New System.Drawing.Size(75, 24)
Me.Button1.TabIndex = 2
Me.Button1.Text = "&Run"
'
'Button2
'
Me.Button2.Dock = System.Windows.Forms.DockStyle.Right
Me.Button2.Font = New System.Drawing.Font( _
"Microsoft Sans Serif", _
9.0!, _
System.Drawing.FontStyle.Regular, _
System.Drawing.GraphicsUnit.Point, _
CType(0, Byte))
Me.Button2.Location = New System.Drawing.Point(521, 20)
Me.Button2.Name = "Button2"
Me.Button2.Size = New System.Drawing.Size(75, 24)
Me.Button2.TabIndex = 3
Me.Button2.Text = "E&xit"
'
'Panel1
'
Me.Panel1.Controls.Add(Me.tbxOutput)
Me.Panel1.Dock = System.Windows.Forms.DockStyle.Fill
Me.Panel1.DockPadding.All = 20
Me.Panel1.Location = New System.Drawing.Point(0, 0)
Me.Panel1.Name = "Panel1"
Me.Panel1.Size = New System.Drawing.Size(616, 320)
Me.Panel1.TabIndex = 2
'
'tbxOutput
'
Me.tbxOutput.AccessibleDescription = _
"Displays output from application."
Me.tbxOutput.AccessibleName = "Output textbox."
Me.tbxOutput.Dock = System.Windows.Forms.DockStyle.Fill
Me.tbxOutput.Location = New System.Drawing.Point(20, 20)
Me.tbxOutput.Name = "tbxOutput"
Me.tbxOutput.Size = New System.Drawing.Size(576, 280)
Me.tbxOutput.TabIndex = 1
Me.tbxOutput.Text = "Click the Run button to run the application."
'
'Form1
'
Me.AutoScaleBaseSize = New System.Drawing.Size(6, 15)
Me.ClientSize = New System.Drawing.Size(616, 384)
Me.Controls.Add(Me.Panel1)
Me.Controls.Add(Me.Panel2)
Me.Name = "Form1"
Me.Text = "AsymmetricAlgorithm"
Me.Panel2.ResumeLayout(False)
Me.Panel1.ResumeLayout(False)
Me.ResumeLayout(False)
End Sub
End Class
End Namespace
'
' This sample produces the following output:
'
' *** CustomCrypto created with default parameters:
' Contoso.vbCustomCrypto
' KeyExchangeAlgorithm: RSA-PKCS1-KeyEx
' SignatureAlgorithm: http://www.w3.org/2000/09/xmldsig#rsa-sha1
' KeySize: 8
' Parameters described in Xml format:
' <CustomCryptoKeyValue><KeyContainerName>SecurityBin1</KeyContainerName>
' <KeyNumber>1</KeyNumber><ProviderName>Contoso</ProviderName>
' <ProviderType>2</ProviderType></CustomCryptoKeyValue>
' Keysize0 min, max, step: 8, 64, 8,
'
' *** CustomCrypto created with custom parameters:
' Contoso.vbCustomCrypto
' KeyExchangeAlgorithm: RSA-PKCS1-KeyEx
' SignatureAlgorithm: http://www.w3.org/2000/09/xmldsig#rsa-sha1
' KeySize: 64
' Parameters described in Xml format:
' <CustomCryptoKeyValue><KeyContainerName>SecurityBin2</KeyContainerName>
' <KeyNumber>1</KeyNumber><ProviderName>Contoso</ProviderName>
' <ProviderType>2</ProviderType></CustomCryptoKeyValue>
' Keysize0 min, max, step: 8, 64, 8,
' Unable to create CustomCrytpo from the Create method
' This sample completed successfully; press Enter to exit.
Ниже приведен дополнительный класс, демонстрирующий использование пользовательского класса.
#using <System.Xml.dll>
#using <System.Security.dll>
using namespace System;
using namespace System::Xml;
using namespace System::Text;
using namespace System::Security::Cryptography;
// Display the properties of the specified CustomCrypto object to the
// console.
static void DisplayProperties(Contoso::CustomCrypto^ customCryptoAlgorithm)
{
// Retrieve the class description for the customCrypto object.
String^ classDescription = customCryptoAlgorithm->ToString();
Console::WriteLine(classDescription);
Console::WriteLine("KeyExchangeAlgorithm: {0}",
customCryptoAlgorithm->KeyExchangeAlgorithm);
Console::WriteLine("SignatureAlgorithm: {0}",
customCryptoAlgorithm->SignatureAlgorithm);
Console::WriteLine("KeySize: {0}",
customCryptoAlgorithm->KeySize);
Console::WriteLine("Parameters described in Xml format:");
Console::WriteLine(customCryptoAlgorithm->ToXmlString(true));
// Display the MinSize, MaxSize, and SkipSize properties of
// each KeySize item in the local keySizes member variable.
array<KeySizes^>^ legalKeySizes = customCryptoAlgorithm->LegalKeySizes;
for (int i = 0; i < legalKeySizes->Length; i++)
{
Console::WriteLine(
"Keysize{0} min, max, step: {1}, {2}, {3}, ", i,
legalKeySizes[i]->MinSize,
legalKeySizes[i]->MaxSize,
legalKeySizes[i]->SkipSize);
}
}
[STAThread]
int main()
{
// Construct a CustomCrypto object and initialize its
// CspParameters.
Contoso::CustomCrypto^ customCryptoAlgorithm = gcnew Contoso::CustomCrypto();
customCryptoAlgorithm->InitializeParameters();
// Display properties of the current customCrypto object.
Console::WriteLine(
"*** CustomCrypto created with default parameters:");
DisplayProperties(customCryptoAlgorithm);
// Release all the resources used by this instance of
// CustomCrypto.
customCryptoAlgorithm->Clear();
customCryptoAlgorithm = gcnew Contoso::CustomCrypto(64);
// Create new parameters and set them by using the FromXmlString
// method.
String^ parameterXml = "<CustomCryptoKeyValue>" +
"<ProviderName>Contoso</ProviderName>" +
"<KeyContainerName>SecurityBin2</KeyContainerName>" +
"<KeyNumber>1</KeyNumber>" +
"<ProviderType>2</ProviderType>" +
"</CustomCryptoKeyValue>";
customCryptoAlgorithm->FromXmlString(parameterXml);
// Display the properties of a customCrypto object created with
// custom parameters.
Console::WriteLine(
"{0}*** CustomCrypto created with custom parameters:", Environment::NewLine);
DisplayProperties(customCryptoAlgorithm);
// Create an object by using the assembly name.
Contoso::CustomCrypto^ cryptoFromAssembly =
Contoso::CustomCrypto::Create("CustomCrypto");
if (cryptoFromAssembly != nullptr)
{
Console::WriteLine("{0}*** Successfully created " +
"CustomCrypto from the Create method.", Environment::NewLine);
DisplayProperties(cryptoFromAssembly);
}
else
{
Console::WriteLine("Unable to create CustomCrypto from " +
"the Create method.");
}
Console::WriteLine(
"This sample completed successfully; press Enter to exit.");
Console::ReadLine();
}
//
// This sample produces the following output:
//
// *** CustomCrypto created with default parameters:
// Contoso.vbCustomCrypto
// KeyExchangeAlgorithm: RSA-PKCS1-KeyEx
// SignatureAlgorithm: http://www.w3.org/2000/09/xmldsig#rsa-sha1
// KeySize: 8
// Parameters described in Xml format:
// <CustomCryptoKeyValue><KeyContainerName>SecurityBin1</KeyContainerName>
// <KeyNumber>1</KeyNumber><ProviderName>Contoso</ProviderName>
// <ProviderType>2</ProviderType></CustomCryptoKeyValue>
// Keysize0 min, max, step: 8, 64, 8,
//
// *** CustomCrypto created with custom parameters:
// Contoso.vbCustomCrypto
// KeyExchangeAlgorithm: RSA-PKCS1-KeyEx
// SignatureAlgorithm: http://www.w3.org/2000/09/xmldsig#rsa-sha1
// KeySize: 64
// Parameters described in Xml format:
// <CustomCryptoKeyValue><KeyContainerName>SecurityBin2</KeyContainerName>
// <KeyNumber>1</KeyNumber><ProviderName>Contoso</ProviderName>
// <ProviderType>2</ProviderType></CustomCryptoKeyValue>
// Keysize0 min, max, step: 8, 64, 8,
// Unable to create CustomCrypto from the Create method
// This sample completed successfully; press Enter to exit.
class CustomCryptoImpl
{
[STAThread]
static void Main(string[] args)
{
// Construct a CustomCrypto object and initialize its
// CspParameters.
CustomCrypto customCrypto = new CustomCrypto();
customCrypto.InitializeParameters();
// Display properties of the current customCrypto object.
Console.WriteLine("*** CustomCrypto created with default " +
"parameters:");
DisplayProperties(customCrypto);
// Release all the resources used by this instance of
// CustomCrytpo.
customCrypto.Clear();
customCrypto = new CustomCrypto(64);
// Create new parameters and set them by using the FromXmlString
// method.
string parameterXml = "<CustomCryptoKeyValue>";
parameterXml += "<ProviderName>Contoso</ProviderName>";
parameterXml += "<KeyContainerName>SecurityBin2";
parameterXml += "</KeyContainerName>";
parameterXml += "<KeyNumber>1</KeyNumber>";
parameterXml += "<ProviderType>2</ProviderType>";
parameterXml += "</CustomCryptoKeyValue>";
customCrypto.FromXmlString(parameterXml);
// Display the properties of a customCrypto object created with
// custom parameters.
Console.WriteLine("\n*** " +
"CustomCrypto created with custom parameters:");
DisplayProperties(customCrypto);
// Create an object by using the assembly name.
try
{
CustomCrypto myCryptoA = CustomCrypto.Create("CustomCrypto");
if (myCryptoA != null)
{
Console.Write("\n*** " +
"Successfully created CustomCrytpo from");
Console.WriteLine(" the Create method.");
DisplayProperties(myCryptoA);
}
else
{
Console.Write("Unable to create CustomCrytpo from ");
Console.WriteLine(" the Create method.");
}
}
catch (Exception ex)
{
Console.WriteLine(ex.ToString());
}
Console.WriteLine("This sample completed successfully; " +
"press Enter to exit.");
Console.ReadLine();
}
// Display the properties of the specified CustomCrypto object to the
// console.
public static void DisplayProperties(CustomCrypto customCrypto)
{
try
{
// Retrieve the class description for the customCrypto object.
string classDescription = customCrypto.ToString();
Console.WriteLine(classDescription);
Console.Write("KeyExchangeAlgorithm: ");
Console.WriteLine(customCrypto.KeyExchangeAlgorithm);
Console.Write("SignatureAlgorithm: ");
Console.WriteLine(customCrypto.SignatureAlgorithm);
Console.WriteLine("KeySize: " + customCrypto.KeySize);
Console.WriteLine("Parameters described in Xml format:");
Console.WriteLine(customCrypto.ToXmlString(true));
// Display the MinSize, MaxSize, and SkipSize properties of
// each KeySize item in the local keySizes member variable.
KeySizes[] legalKeySizes = customCrypto.LegalKeySizes;
if (legalKeySizes.Length > 0)
{
for (int i=0; i < legalKeySizes.Length; i++)
{
Console.Write("Keysize" + i + " min, max, step: ");
Console.Write(legalKeySizes[i].MinSize + ", ");
Console.Write(legalKeySizes[i].MaxSize + ", ");
Console.WriteLine(legalKeySizes[i].SkipSize + ", ");
}
}
}
catch (Exception ex)
{
Console.WriteLine("Caught unexpected exception: " +
ex.ToString());
}
}
}
}
//
// This sample produces the following output:
//
// *** CustomCrypto created with default parameters:
// Contoso.vbCustomCrypto
// KeyExchangeAlgorithm: RSA-PKCS1-KeyEx
// SignatureAlgorithm: http://www.w3.org/2000/09/xmldsig#rsa-sha1
// KeySize: 8
// Parameters described in Xml format:
// <CustomCryptoKeyValue><KeyContainerName>SecurityBin1</KeyContainerName>
// <KeyNumber>1</KeyNumber><ProviderName>Contoso</ProviderName>
// <ProviderType>2</ProviderType></CustomCryptoKeyValue>
// Keysize0 min, max, step: 8, 64, 8,
//
// *** CustomCrypto created with custom parameters:
// Contoso.vbCustomCrypto
// KeyExchangeAlgorithm: RSA-PKCS1-KeyEx
// SignatureAlgorithm: http://www.w3.org/2000/09/xmldsig#rsa-sha1
// KeySize: 64
// Parameters described in Xml format:
// <CustomCryptoKeyValue><KeyContainerName>SecurityBin2</KeyContainerName>
// <KeyNumber>1</KeyNumber><ProviderName>Contoso</ProviderName>
// <ProviderType>2</ProviderType></CustomCryptoKeyValue>
// Keysize0 min, max, step: 8, 64, 8,
// Unable to create CustomCrytpo from the Create method
// This sample completed successfully; press Exit to continue.
Class Form1
Inherits System.Windows.Forms.Form
' Event handler for Run button.
Private Sub Button1_Click( _
ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles Button1.Click
tbxOutput.Cursor = Cursors.WaitCursor
tbxOutput.Text = ""
' Construct a CustomCrypto object and initialize its
' CspParameters.
Dim customCrypto As New Contoso.vbCustomCrypto
customCrypto.InitializeParameters()
' Display properties of the current vbCustomCrypto object.
WriteLine("*** CustomCrypto created with default parameters:")
DisplayProperties(customCrypto)
' Release all the resources used by this instance of CustomCrytpo.
customCrypto.Clear()
customCrypto = New Contoso.vbCustomCrypto(64)
' Create new parameters and set them by using the
' FromXmlString method.
Dim parameterXml As String = "<CustomCryptoKeyValue>"
parameterXml += "<ProviderName>Contoso</ProviderName>"
parameterXml += "<KeyContainerName>SecurityBin2"
parameterXml += "</KeyContainerName>"
parameterXml += "<KeyNumber>1</KeyNumber>"
parameterXml += "<ProviderType>2</ProviderType>"
parameterXml += "</CustomCryptoKeyValue>"
customCrypto.FromXmlString(parameterXml)
' Display the properties of a customCrypto object created with
' custom parameters.
WriteLine(vbCrLf + "*** " + _
"CustomCrypto created with custom parameters:")
DisplayProperties(customCrypto)
' Create an object by using the assembly name.
Try
Dim createdCrypto As Contoso.vbCustomCrypto
createdCrypto = customCrypto.Create("vbCustomCrypto")
If (Not createdCrypto Is Nothing) Then
Write(vbCrLf + "*** Successfully created vbCustomCrytpo ")
WriteLine("from the Create method.")
DisplayProperties(createdCrypto)
Else
Write("Unable to create CustomCrytpo from ")
WriteLine(" the Create method.")
End If
Catch ex As Exception
WriteLine(ex.ToString())
End Try
' Align interface and conclude application.
WriteLine("This sample completed successfully;" + _
" press Exit to continue.")
' Reset the cursor.
tbxOutput.Cursor = Cursors.Default
End Sub
' Display the properties of the specified CustomCrypto object to
' the output texbox.
Public Sub DisplayProperties( _
ByVal customCrypto As Contoso.vbCustomCrypto)
Try
' Retrieve the class description for the customCrypto object.
Dim classDescription As String = customCrypto.ToString()
WriteLine(classDescription)
WriteLine("KeyExchangeAlgorithm: " + _
customCrypto.KeyExchangeAlgorithm)
WriteLine("SignatureAlgorithm: " + _
customCrypto.SignatureAlgorithm)
WriteLine("KeySize: " + customCrypto.KeySize.ToString())
WriteLine("Parameters described in Xml format:")
WriteLine(customCrypto.ToXmlString(True))
' Display the MinSize, MaxSize, and SkipSize properties of
' each KeySize item in the local keySizes member variable.
Dim legalKeySizes() As KeySizes = customCrypto.LegalKeySizes
If (legalKeySizes.Length > 0) Then
For i As Integer = 0 To legalKeySizes.Length - 1 Step 1
Write("Keysize" + i.ToString() + " min, max, step: ")
Write(legalKeySizes(i).MinSize.ToString() + ", ")
Write(legalKeySizes(i).MaxSize.ToString() + ", ")
Write(legalKeySizes(i).SkipSize.ToString() + ", ")
WriteLine("")
Next
End If
Catch ex As Exception
WriteLine("Caught unexpected exception: " + ex.ToString())
End Try
End Sub
' Write the specified message and carriage return to the output
' textbox.
Private Sub WriteLine(ByVal message As String)
tbxOutput.AppendText(message + vbCrLf)
End Sub
' Write the specified message to the output textbox.
Private Sub Write(ByVal message As String)
tbxOutput.AppendText(message)
End Sub
' Event handler for Exit button.
Private Sub Button2_Click( _
ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles Button2.Click
Application.Exit()
End Sub
Public Sub New()
MyBase.New()
'This call is required by the Windows Form Designer.
InitializeComponent()
'Add any initialization after the InitializeComponent() call
End Sub
'Form overrides dispose to clean up the component list.
Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
If disposing Then
If Not (components Is Nothing) Then
components.Dispose()
End If
End If
MyBase.Dispose(disposing)
End Sub
'Required by the Windows Form Designer
Private components As System.ComponentModel.IContainer
'NOTE: The following procedure is required by the Windows Form
'Designer. It can be modified using the Windows Form Designer.
'Do not modify it using the code editor.
Friend WithEvents Panel2 As System.Windows.Forms.Panel
Friend WithEvents Panel1 As System.Windows.Forms.Panel
Friend WithEvents Button1 As System.Windows.Forms.Button
Friend WithEvents Button2 As System.Windows.Forms.Button
Friend WithEvents tbxOutput As System.Windows.Forms.RichTextBox
<System.Diagnostics.DebuggerStepThrough()> _
Private Sub InitializeComponent()
Me.Panel2 = New System.Windows.Forms.Panel
Me.Button1 = New System.Windows.Forms.Button
Me.Button2 = New System.Windows.Forms.Button
Me.Panel1 = New System.Windows.Forms.Panel
Me.tbxOutput = New System.Windows.Forms.RichTextBox
Me.Panel2.SuspendLayout()
Me.Panel1.SuspendLayout()
Me.SuspendLayout()
'
'Panel2
'
Me.Panel2.Controls.Add(Me.Button1)
Me.Panel2.Controls.Add(Me.Button2)
Me.Panel2.Dock = System.Windows.Forms.DockStyle.Bottom
Me.Panel2.DockPadding.All = 20
Me.Panel2.Location = New System.Drawing.Point(0, 320)
Me.Panel2.Name = "Panel2"
Me.Panel2.Size = New System.Drawing.Size(616, 64)
Me.Panel2.TabIndex = 1
'
'Button1
'
Me.Button1.Dock = System.Windows.Forms.DockStyle.Right
Me.Button1.Font = New System.Drawing.Font( _
"Microsoft Sans Serif", _
9.0!, _
System.Drawing.FontStyle.Regular, _
System.Drawing.GraphicsUnit.Point, _
CType(0, Byte))
Me.Button1.Location = New System.Drawing.Point(446, 20)
Me.Button1.Name = "Button1"
Me.Button1.Size = New System.Drawing.Size(75, 24)
Me.Button1.TabIndex = 2
Me.Button1.Text = "&Run"
'
'Button2
'
Me.Button2.Dock = System.Windows.Forms.DockStyle.Right
Me.Button2.Font = New System.Drawing.Font( _
"Microsoft Sans Serif", _
9.0!, _
System.Drawing.FontStyle.Regular, _
System.Drawing.GraphicsUnit.Point, _
CType(0, Byte))
Me.Button2.Location = New System.Drawing.Point(521, 20)
Me.Button2.Name = "Button2"
Me.Button2.Size = New System.Drawing.Size(75, 24)
Me.Button2.TabIndex = 3
Me.Button2.Text = "E&xit"
'
'Panel1
'
Me.Panel1.Controls.Add(Me.tbxOutput)
Me.Panel1.Dock = System.Windows.Forms.DockStyle.Fill
Me.Panel1.DockPadding.All = 20
Me.Panel1.Location = New System.Drawing.Point(0, 0)
Me.Panel1.Name = "Panel1"
Me.Panel1.Size = New System.Drawing.Size(616, 320)
Me.Panel1.TabIndex = 2
'
'tbxOutput
'
Me.tbxOutput.AccessibleDescription = _
"Displays output from application."
Me.tbxOutput.AccessibleName = "Output textbox."
Me.tbxOutput.Dock = System.Windows.Forms.DockStyle.Fill
Me.tbxOutput.Location = New System.Drawing.Point(20, 20)
Me.tbxOutput.Name = "tbxOutput"
Me.tbxOutput.Size = New System.Drawing.Size(576, 280)
Me.tbxOutput.TabIndex = 1
Me.tbxOutput.Text = "Click the Run button to run the application."
'
'Form1
'
Me.AutoScaleBaseSize = New System.Drawing.Size(6, 15)
Me.ClientSize = New System.Drawing.Size(616, 384)
Me.Controls.Add(Me.Panel1)
Me.Controls.Add(Me.Panel2)
Me.Name = "Form1"
Me.Text = "AsymmetricAlgorithm"
Me.Panel2.ResumeLayout(False)
Me.Panel1.ResumeLayout(False)
Me.ResumeLayout(False)
End Sub
End Class
End Namespace
'
' This sample produces the following output:
'
' *** CustomCrypto created with default parameters:
' Contoso.vbCustomCrypto
' KeyExchangeAlgorithm: RSA-PKCS1-KeyEx
' SignatureAlgorithm: http://www.w3.org/2000/09/xmldsig#rsa-sha1
' KeySize: 8
' Parameters described in Xml format:
' <CustomCryptoKeyValue><KeyContainerName>SecurityBin1</KeyContainerName>
' <KeyNumber>1</KeyNumber><ProviderName>Contoso</ProviderName>
' <ProviderType>2</ProviderType></CustomCryptoKeyValue>
' Keysize0 min, max, step: 8, 64, 8,
'
' *** CustomCrypto created with custom parameters:
' Contoso.vbCustomCrypto
' KeyExchangeAlgorithm: RSA-PKCS1-KeyEx
' SignatureAlgorithm: http://www.w3.org/2000/09/xmldsig#rsa-sha1
' KeySize: 64
' Parameters described in Xml format:
' <CustomCryptoKeyValue><KeyContainerName>SecurityBin2</KeyContainerName>
' <KeyNumber>1</KeyNumber><ProviderName>Contoso</ProviderName>
' <ProviderType>2</ProviderType></CustomCryptoKeyValue>
' Keysize0 min, max, step: 8, 64, 8,
' Unable to create CustomCrytpo from the Create method
' This sample completed successfully; press Enter to exit.
Комментарии
Асимметричные алгоритмы шифрования, также известные как алгоритмы с открытым ключом, требуют, чтобы и отправитель, и получатель поддерживали пару связанных ключей: закрытый ключ и открытый ключ. Оба ключа уникальны для сущности. Открытый ключ может быть доступен любому пользователю; Этот ключ используется для кодирования данных, отправляемых получателю. Закрытый ключ должен оставаться закрытым получателем; Этот ключ используется для декодирования сообщений, закодированных с помощью открытого ключа получателя. Класс RSACryptoServiceProvider является реализацией алгоритма с открытым ключом. Подробное обсуждение шифрования с открытым ключом и алгоритмов см. в разделе "Шифрование с открытым ключом" статьи Службы шифрования. Сведения об использовании средства строгих имен (Sn.exe) для создания пар ключей см. в разделе Практическое руководство. Создание пары ключей Public-Private.
Для формирования цифровых подписей можно использовать системы с открытыми ключами. Цифровые подписи используются для защиты целостности данных. Например, чтобы использовать систему открытых ключей для цифровой подписи сообщения, отправитель сначала применяет хэш-функцию к сообщению, чтобы создать дайджест сообщения. Затем отправитель шифрует дайджест сообщения с помощью закрытого ключа отправителя, чтобы создать личную подпись отправителя. Получив сообщение и подпись, получатель расшифровывает подпись с помощью открытого ключа отправителя для восстановления хэша сообщения и хэширует сообщение с помощью того же хэш-алгоритма, что и отправитель. Если хэш-код сообщения, вычисляемый получателем, соответствует хэш-коду, полученному от отправителя, получатель может предположить, что сообщение не было изменено во время передачи. Обратите внимание, что любой пользователь может проверить подпись, так как открытый ключ отправителя общеизвестен. Этот метод не сохраняет секретность сообщения; Чтобы сообщение было секретным, оно также должно быть зашифровано.
Платформа .NET Framework предоставляет следующие классы, реализующие алгоритмы цифровой подписи: DSACryptoServiceProvider, RSACryptoServiceProvider, ECDsa (базовый класс) и ECDsaCng.
Пространство System.Security.Cryptography имен предоставляет конкретные классы только для RSA и DSA .
Сведения об использовании алгоритма RSA для шифрования и расшифровки XML-данных, а также создания и проверки цифровых подписей XML см. в следующих статьях:
Практическое руководство. Шифрование XML-элементов с помощью асимметричных ключей
Практическое руководство. Расшифровывание XML-элементов с помощью асимметричных ключей
Практическое руководство. Подписание XML-документов с помощью цифровых подписей
Практическое руководство. Проверка цифровых подписей XML-документов
Конструкторы
| AsymmetricAlgorithm() |
Инициализирует новый экземпляр класса AsymmetricAlgorithm. |
Поля
| KeySizeValue |
Представляет размер модуля ключа (в битах), используемого алгоритмом асимметричного шифрования. |
| LegalKeySizesValue |
Задает размеры ключа, которые поддерживаются алгоритмом асимметричного шифрования. |
Свойства
| KeyExchangeAlgorithm |
При переопределении в производном классе возвращает имя алгоритма обмена ключами. В противном случае создается исключение NotImplementedException. |
| KeySize |
Получает или задает размер модуля ключа (в битах), используемого алгоритмом асимметричного шифрования. |
| LegalKeySizes |
Возвращает размеры ключа, которые поддерживаются алгоритмом асимметричного шифрования. |
| SignatureAlgorithm |
При реализации в производном классе возвращает имя алгоритма подписи. В противном случае всегда создается исключение NotImplementedException. |
Методы
| Clear() |
Освобождает все ресурсы, используемые классом AsymmetricAlgorithm. |
| Create() |
Устаревшие..
Устаревшие..
Создает криптографический объект по умолчанию, используемый для выполнения алгоритма асимметричного шифрования. |
| Create(String) |
Устаревшие..
Создает экземпляр заданной реализации алгоритма асимметричного шифрования. |
| Dispose() |
Освобождает все ресурсы, используемые текущим экземпляром класса AsymmetricAlgorithm. |
| Dispose(Boolean) |
Освобождает неуправляемые ресурсы, используемые классом AsymmetricAlgorithm (при необходимости освобождает и управляемые ресурсы). |
| Equals(Object) |
Определяет, равен ли указанный объект текущему объекту. (Унаследовано от Object) |
| ExportEncryptedPkcs8PrivateKey(ReadOnlySpan<Byte>, PbeParameters) |
Экспортирует текущий ключ в формате PKCS #8 EncryptedPrivateKeyInfo с паролем, основанным на байтах. |
| ExportEncryptedPkcs8PrivateKey(ReadOnlySpan<Char>, PbeParameters) |
Экспортирует текущий ключ в формате PKCS #8 EncryptedPrivateKeyInfo с паролем, основанным на символах. |
| ExportEncryptedPkcs8PrivateKeyPem(ReadOnlySpan<Byte>, PbeParameters) |
Экспортирует текущий ключ в формате PKCS#8 EncryptedPrivateKeyInfo с паролем на основе байтов в кодировке PEM. |
| ExportEncryptedPkcs8PrivateKeyPem(ReadOnlySpan<Char>, PbeParameters) |
Экспортирует текущий ключ в формате PKCS#8 EncryptedPrivateKeyInfo с паролем на основе символов в кодировке PEM. |
| ExportPkcs8PrivateKey() |
Экспортирует текущий ключ в формате PKCS#8 PrivateKeyInfo. |
| ExportPkcs8PrivateKeyPem() |
Экспортирует текущий ключ в формате PKCS#8 PrivateKeyInfo в кодировке PEM. |
| ExportSubjectPublicKeyInfo() |
Экспортирует открытую часть текущего ключа в формате X.509 SubjectPublicKeyInfo. |
| ExportSubjectPublicKeyInfoPem() |
Экспортирует часть текущего ключа с открытым ключом в формате X.509 SubjectPublicKeyInfo в кодировке PEM. |
| FromXmlString(String) |
Если переопределено в производном классе, восстанавливает объект AsymmetricAlgorithm из XML-строки. В противном случае создается исключение NotImplementedException. |
| GetHashCode() |
Служит хэш-функцией по умолчанию. (Унаследовано от Object) |
| GetType() |
Возвращает объект Type для текущего экземпляра. (Унаследовано от Object) |
| ImportEncryptedPkcs8PrivateKey(ReadOnlySpan<Byte>, ReadOnlySpan<Byte>, Int32) |
При переопределении в производном классе импортирует пару открытого и закрытого ключей из структуры PKCS#8 EncryptedPrivateKeyInfo после расшифровки с помощью байтового пароля и заменяет ключи для этого объекта. |
| ImportEncryptedPkcs8PrivateKey(ReadOnlySpan<Char>, ReadOnlySpan<Byte>, Int32) |
При переопределении в производном классе импортирует пару открытого и закрытого ключей из структуры PKCS#8 EncryptedPrivateKeyInfo после расшифровки с помощью символьного пароля и заменяет ключи для этого объекта. |
| ImportFromEncryptedPem(ReadOnlySpan<Char>, ReadOnlySpan<Byte>) |
При переопределении в производном классе импортирует зашифрованный ключ в формате RFC 7468 с кодировкой PEM, заменяя ключи для этого объекта. |
| ImportFromEncryptedPem(ReadOnlySpan<Char>, ReadOnlySpan<Char>) |
При переопределении в производном классе импортирует зашифрованный ключ в формате RFC 7468 с кодировкой PEM, заменяя ключи для этого объекта. |
| ImportFromPem(ReadOnlySpan<Char>) |
При переопределении в производном классе импортирует ключ в формате RFC 7468 с текстовой кодировкой, заменяя ключи для этого объекта. |
| ImportPkcs8PrivateKey(ReadOnlySpan<Byte>, Int32) |
При переопределении в производном классе импортирует пару открытого и закрытого ключей из структуры PKCS#8 PrivateKeyInfo после расшифровки и заменяет ключи для этого объекта. |
| ImportSubjectPublicKeyInfo(ReadOnlySpan<Byte>, Int32) |
При переопределении в производном классе импортирует открытый ключ из структуры X.509 SubjectPublicKeyInfo после расшифровки и заменяет ключи для этого объекта. |
| MemberwiseClone() |
Создает неполную копию текущего объекта Object. (Унаследовано от Object) |
| ToString() |
Возвращает строку, представляющую текущий объект. (Унаследовано от Object) |
| ToXmlString(Boolean) |
Если переопределено в производном классе, создает и возвращает представление текущего объекта AsymmetricAlgorithm в виде XML-строки. В противном случае создается исключение NotImplementedException. |
| TryExportEncryptedPkcs8PrivateKey(ReadOnlySpan<Byte>, PbeParameters, Span<Byte>, Int32) |
При переопределении в производном классе пытается экспортировать текущий ключ в формате PKCS#8 EncryptedPrivateKeyInfo в предоставленный буфер с использованием байтового пароля. |
| TryExportEncryptedPkcs8PrivateKey(ReadOnlySpan<Char>, PbeParameters, Span<Byte>, Int32) |
При переопределении в производном классе пытается экспортировать текущий ключ в формате PKCS#8 EncryptedPrivateKeyInfo в предоставленный буфер с использованием символьного пароля. |
| TryExportEncryptedPkcs8PrivateKeyPem(ReadOnlySpan<Byte>, PbeParameters, Span<Char>, Int32) |
Пытается экспортировать текущий ключ в формате PKCS#8 EncryptedPrivateKeyInfo с паролем на основе байтов в кодировке PEM. |
| TryExportEncryptedPkcs8PrivateKeyPem(ReadOnlySpan<Char>, PbeParameters, Span<Char>, Int32) |
Экспортирует текущий ключ в формате PKCS#8 EncryptedPrivateKeyInfo с паролем на основе символов в кодировке PEM. |
| TryExportPkcs8PrivateKey(Span<Byte>, Int32) |
При переопределении в производном классе пытается экспортировать текущий ключ в формате PKCS#8 PrivateKeyInfo в предоставленный буфер. |
| TryExportPkcs8PrivateKeyPem(Span<Char>, Int32) |
Пытается экспортировать текущий ключ в формате PKCS#8 PrivateKeyInfo с кодировкой PEM в предоставленный буфер. |
| TryExportSubjectPublicKeyInfo(Span<Byte>, Int32) |
При переопределении в производном классе пытается экспортировать текущий ключ в формате X.509 SubjectPublicKeyInfo в предоставленный буфер. |
| TryExportSubjectPublicKeyInfoPem(Span<Char>, Int32) |
Пытается экспортировать текущий ключ в формате X.509 SubjectPublicKeyInfo в кодировке PEM в предоставленный буфер. |
Явные реализации интерфейса
| IDisposable.Dispose() |
Этот API поддерживает инфраструктуру продукта и не предназначен для использования непосредственно из программного кода. Описание этого члена см. в разделе Dispose(). |
Применяется к
См. также раздел
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