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RSACryptoServiceProvider.KeySize Property

Gets the size of the current key.

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

public override int KeySize { get; }

Property Value

Type: System.Int32
The size of the key in bits.

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.

.NET Framework

Supported in: 4.5.3, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

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