SymmetricAlgorithm.LegalKeySizes SymmetricAlgorithm.LegalKeySizes SymmetricAlgorithm.LegalKeySizes SymmetricAlgorithm.LegalKeySizes Property

Definition

Gets the key sizes, in bits, that are supported by the symmetric algorithm.

public:
 virtual property cli::array <System::Security::Cryptography::KeySizes ^> ^ LegalKeySizes { cli::array <System::Security::Cryptography::KeySizes ^> ^ get(); };
public virtual System.Security.Cryptography.KeySizes[] LegalKeySizes { get; }
member this.LegalKeySizes : System.Security.Cryptography.KeySizes[]
Public Overridable ReadOnly Property LegalKeySizes As KeySizes()
Property Value

An array that contains the key sizes supported by the algorithm.

Examples

The following example shows the value of LegalKeySizes for the symmetric algorithms.

using System;
using System.Security.Cryptography;
namespace SymmetricAlgo
{
    class Program
    {
        static void Main(string[] args)
        {
            AesManaged aes = new AesManaged();
            Console.WriteLine("AesManaged ");
            KeySizes[] ks = aes.LegalKeySizes;
            foreach (KeySizes k in ks)
            {
                Console.WriteLine("\tLegal min key size = " + k.MinSize);
                Console.WriteLine("\tLegal max key size = " + k.MaxSize);
            }
            ks = aes.LegalBlockSizes;
            foreach (KeySizes k in ks)
            {
                Console.WriteLine("\tLegal min block size = " + k.MinSize);
                Console.WriteLine("\tLegal max block size = " + k.MaxSize);
            }
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            Console.WriteLine("DESCryptoServiceProvider ");
            ks = des.LegalKeySizes;
            foreach (KeySizes k in ks)
            {
                Console.WriteLine("\tLegal min key size = " + k.MinSize);
                Console.WriteLine("\tLegal max key size = " + k.MaxSize);
            }
            ks = des.LegalBlockSizes;
            foreach (KeySizes k in ks)
            {
                Console.WriteLine("\tLegal min block size = " + k.MinSize);
                Console.WriteLine("\tLegal max block size = " + k.MaxSize);
            }
            RC2CryptoServiceProvider rc2 = new RC2CryptoServiceProvider();
            Console.WriteLine("RC2CryptoServiceProvider ");
            ks = rc2.LegalKeySizes;
            foreach (KeySizes k in ks)
            {
                Console.WriteLine("\tLegal min key size = " + k.MinSize);
                Console.WriteLine("\tLegal max key size = " + k.MaxSize);
            }
            ks = rc2.LegalBlockSizes;
            foreach (KeySizes k in ks)
            {
                Console.WriteLine("\tLegal min block size = " + k.MinSize);
                Console.WriteLine("\tLegal max block size = " + k.MaxSize);
            }
            RijndaelManaged rij = new RijndaelManaged();
            Console.WriteLine("RijndaelManaged ");
            ks = rij.LegalKeySizes;
            foreach (KeySizes k in ks)
            {
                Console.WriteLine("\tLegal min key size = " + k.MinSize);
                Console.WriteLine("\tLegal max key size = " + k.MaxSize);
            }
            ks = rij.LegalBlockSizes;
            foreach (KeySizes k in ks)
            {
                Console.WriteLine("\tLegal min block size = " + k.MinSize);
                Console.WriteLine("\tLegal max block size = " + k.MaxSize);
            }
            TripleDESCryptoServiceProvider tsp = new TripleDESCryptoServiceProvider();
            Console.WriteLine("TripleDESCryptoServiceProvider ");
            ks = tsp.LegalKeySizes;
            foreach (KeySizes k in ks)
            {
                Console.WriteLine("\tLegal min key size = " + k.MinSize);
                Console.WriteLine("\tLegal max key size = " + k.MaxSize);
            }
            ks = tsp.LegalBlockSizes;
            foreach (KeySizes k in ks)
            {
                Console.WriteLine("\tLegal min block size = " + k.MinSize);
                Console.WriteLine("\tLegal max block size = " + k.MaxSize);
            }
            
        }
    }
}
//This sample produces the following output:
//AesManaged
//        Legal min key size = 128
//        Legal max key size = 256
//        Legal min block size = 128
//        Legal max block size = 128
//DESCryptoServiceProvider
//        Legal min key size = 64
//        Legal max key size = 64
//        Legal min block size = 64
//        Legal max block size = 64
//RC2CryptoServiceProvider
//        Legal min key size = 40
//        Legal max key size = 128
//        Legal min block size = 64
//        Legal max block size = 64
//RijndaelManaged
//        Legal min key size = 128
//        Legal max key size = 256
//        Legal min block size = 128
//        Legal max block size = 256
//TripleDESCryptoServiceProvider
//        Legal min key size = 128
//        Legal max key size = 192
//        Legal min block size = 64
//        Legal max block size = 64
Imports System
Imports System.Security.Cryptography


Class Program

    Shared Sub Main(ByVal args() As String)
        Dim aes As New AesManaged()
        Console.WriteLine("AesManaged ")
        Dim ks As KeySizes() = aes.LegalKeySizes
        Dim k As KeySizes
        For Each k In ks
            Console.WriteLine(vbTab + "Legal min key size = " + k.MinSize)
            Console.WriteLine(vbTab + "Legal max key size = " + k.MaxSize)
        Next k
        ks = aes.LegalBlockSizes

        For Each k In ks
            Console.WriteLine(vbTab + "Legal min block size = " + k.MinSize)
            Console.WriteLine(vbTab + "Legal max block size = " + k.MaxSize)
        Next k

        Dim des As New DESCryptoServiceProvider()
        Console.WriteLine("DESCryptoServiceProvider ")
        ks = des.LegalKeySizes

        For Each k In ks
            Console.WriteLine(vbTab + "Legal min key size = " + k.MinSize)
            Console.WriteLine(vbTab + "Legal max key size = " + k.MaxSize)
        Next k
        ks = des.LegalBlockSizes

        For Each k In ks
            Console.WriteLine(vbTab + "Legal min block size = " + k.MinSize)
            Console.WriteLine(vbTab + "Legal max block size = " + k.MaxSize)
        Next k

        Dim rc2 As New RC2CryptoServiceProvider()
        Console.WriteLine("RC2CryptoServiceProvider ")
        ks = rc2.LegalKeySizes

        For Each k In ks
            Console.WriteLine(vbTab + "Legal min key size = " + k.MinSize)
            Console.WriteLine(vbTab + "Legal max key size = " + k.MaxSize)
        Next k
        ks = rc2.LegalBlockSizes

        For Each k In ks
            Console.WriteLine(vbTab + "Legal min block size = " + k.MinSize)
            Console.WriteLine(vbTab + "Legal max block size = " + k.MaxSize)
        Next k

        Dim rij As New RijndaelManaged()
        Console.WriteLine("RijndaelManaged ")
        ks = rij.LegalKeySizes

        For Each k In ks
            Console.WriteLine(vbTab + "Legal min key size = " + k.MinSize)
            Console.WriteLine(vbTab + "Legal max key size = " + k.MaxSize)
        Next k
        ks = rij.LegalBlockSizes

        For Each k In ks
            Console.WriteLine(vbTab + "Legal min block size = " + k.MinSize)
            Console.WriteLine(vbTab + "Legal max block size = " + k.MaxSize)
        Next k

        Dim tsp As New TripleDESCryptoServiceProvider()
        Console.WriteLine("TripleDESCryptoServiceProvider ")
        ks = tsp.LegalKeySizes

        For Each k In ks
            Console.WriteLine(vbTab + "Legal min key size = " + k.MinSize)
            Console.WriteLine(vbTab + "Legal max key size = " + k.MaxSize)
        Next k
        ks = tsp.LegalBlockSizes

        For Each k In ks
            Console.WriteLine(vbTab + "Legal min block size = " + k.MinSize)
            Console.WriteLine(vbTab + "Legal max block size = " + k.MaxSize)
        Next k

    End Sub 'Main 
End Class 'Program
'This sample produces the following output:
'AesManaged
'        Legal min key size = 128
'        Legal max key size = 256
'        Legal min block size = 128
'        Legal max block size = 128
'DESCryptoServiceProvider
'        Legal min key size = 64
'        Legal max key size = 64
'        Legal min block size = 64
'        Legal max block size = 64
'RC2CryptoServiceProvider
'        Legal min key size = 40
'        Legal max key size = 128
'        Legal min block size = 64
'        Legal max block size = 64
'RijndaelManaged
'        Legal min key size = 128
'        Legal max key size = 256
'        Legal min block size = 128
'        Legal max block size = 256
'TripleDESCryptoServiceProvider
'        Legal min key size = 128
'        Legal max key size = 192
'        Legal min block size = 64
'        Legal max block size = 64

Remarks

The symmetric algorithm supports only key sizes that match an entry in this array.

Applies to

See Also