RSACryptoServiceProvider.KeySize Property

Definition

Gets the size of the current key.

public:
 virtual property int KeySize { int get(); };
public override int KeySize { get; }
member this.KeySize : int
Public Overrides ReadOnly Property KeySize As Integer

Property Value

Int32

The size of the key in bits.

Remarks

The RSACryptoServiceProvider supports key sizes from 384 bits to 16384 bits in increments of 8 bits if you have the Microsoft Enhanced Cryptographic Provider installed. It supports key sizes from 384 bits to 512 bits in increments of 8 bits if you have the Microsoft Base Cryptographic Provider installed.

Valid key sizes are dependent on the cryptographic service provider (CSP) that is used by the RSACryptoServiceProvider instance. Windows CSPs enable key sizes of 384 to 16384 bits for Windows versions prior to Windows 8.1, and key sizes of 512 to 16384 bits for Windows 8.1. For more information, see CryptGenKey function in the Windows documentation.

The RSACryptoServiceProvider class does not allow you to change key sizes using the KeySize property. Any value written to this property will fail to update the property without error. To change the key size, use one of the constructor overloads.

Applies to

See also