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AsymmetricAlgorithm.KeySize Property

Gets or sets the size, in bits, of the key modulus used by the asymmetric algorithm.

Namespace:  System.Security.Cryptography
Assembly:  mscorlib (in mscorlib.dll)

public virtual int KeySize { get; set; }

Property Value

Type: System.Int32
The size, in bits, of the key modulus used by the asymmetric algorithm.

ExceptionCondition
CryptographicException

The key modulus size is invalid.

The valid key sizes are specified by the particular implementation of the asymmetric algorithm and are listed in the LegalKeySizes property.

The following code example demonstrates how to override the KeySize property to verify that it falls within the range identified in the local keySizes member variable. This code example is part of a larger example provided for the AsymmetricAlgorithm class.

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.");
    }
}

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 3.5, 2.0

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