RSACryptoServiceProvider Class
Microsoft Silverlight will reach end of support after October 2021. Learn more.
Performs asymmetric encryption and decryption using the implementation of the RSA algorithm provided by the cryptographic service provider (CSP). This class cannot be inherited.
Inheritance Hierarchy
System.Object
System.Security.Cryptography.AsymmetricAlgorithm
System.Security.Cryptography.RSA
System.Security.Cryptography.RSACryptoServiceProvider
Namespace: System.Security.Cryptography
Assembly: mscorlib.Extensions (in mscorlib.Extensions.dll)
Syntax
'Declaration
<ComVisibleAttribute(True)> _
Public NotInheritable Class RSACryptoServiceProvider _
Inherits RSA _
Implements ICspAsymmetricAlgorithm
[ComVisibleAttribute(true)]
public sealed class RSACryptoServiceProvider : RSA,
ICspAsymmetricAlgorithm
The RSACryptoServiceProvider type exposes the following members.
Constructors
| Name | Description | |
|---|---|---|
.gif "Public method") .gif "Supported by Silverlight for Windows Phone") |
RSACryptoServiceProvider() | Initializes a new instance of the RSACryptoServiceProvider class using the default key. |
|
RSACryptoServiceProvider(CspParameters) | Initializes a new instance of the RSACryptoServiceProvider class with the specified parameters. |
|
RSACryptoServiceProvider(Int32) | Initializes a new instance of the RSACryptoServiceProvider class with the specified key size. |
|
RSACryptoServiceProvider(Int32, CspParameters) | Initializes a new instance of the RSACryptoServiceProvider class with the specified key size and parameters. |
Top
Properties
| Name | Description | |
|---|---|---|
.gif "Public property") |
CspKeyContainerInfo | Gets a CspKeyContainerInfo object that describes additional information about a cryptographic key pair. |
|
KeyExchangeAlgorithm | Gets the name of the key exchange algorithm available with this implementation of RSA. (Overrides AsymmetricAlgorithm.KeyExchangeAlgorithm.) |
|
KeySize | Gets the size of the current key. (Overrides AsymmetricAlgorithm.KeySize.) |
|
LegalKeySizes | Gets the key sizes that are supported by the asymmetric algorithm. (Inherited from AsymmetricAlgorithm.) |
|
PersistKeyInCsp | Gets or sets a value indicating whether the key should be persisted in the cryptographic service provider (CSP). |
|
PublicOnly | Gets a value that indicates whether the RSACryptoServiceProvider object contains only a public key. |
|
SignatureAlgorithm | Gets the name of the signature algorithm available with this implementation of RSA. (Overrides AsymmetricAlgorithm.SignatureAlgorithm.) |
.gif "Static member") |
UseMachineKeyStore | Gets or sets a value indicating whether the key should be persisted in the computer's key store instead of the user profile store. |
Top
Methods
| Name | Description | |
|---|---|---|
|
Clear | Releases all resources used by the AsymmetricAlgorithm class. (Inherited from AsymmetricAlgorithm.) |
|
Decrypt | Decrypts data with the RSA algorithm. |
|
DecryptValue | This method is not supported in the current version. (Overrides RSA.DecryptValue(array<Byte[]).) |
|
Dispose() | Releases all resources used by the current instance of the AsymmetricAlgorithm class. (Inherited from AsymmetricAlgorithm.) |
.gif "Protected method") |
Dispose(Boolean) | Releases the unmanaged resources used by the AsymmetricAlgorithm class and optionally releases the managed resources. (Inherited from AsymmetricAlgorithm.) |
|
Encrypt | Encrypts data with the RSA algorithm. |
|
EncryptValue | This method is not supported in the current version. (Overrides RSA.EncryptValue(array<Byte[]).) |
|
Equals(Object) | Determines whether the specified Object is equal to the current Object. (Inherited from Object.) |
|
ExportCspBlob | Security Critical. Exports a blob containing the key information associated with an RSACryptoServiceProvider object. |
|
ExportParameters | Exports the RSAParameters. (Overrides RSA.ExportParameters(Boolean).) |
|
Finalize | Allows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.) |
|
FromXmlString | Initializes an RSA object from the key information from an XML string. (Inherited from RSA.) |
|
GetHashCode | Serves as a hash function for a particular type. (Inherited from Object.) |
|
GetType | Gets the Type of the current instance. (Inherited from Object.) |
|
ImportCspBlob | Security Critical. Imports a blob that represents RSA key information. |
|
ImportParameters | Imports the specified RSAParameters. (Overrides RSA.ImportParameters(RSAParameters).) |
|
MemberwiseClone | Creates a shallow copy of the current Object. (Inherited from Object.) |
|
SignData(array<Byte[], Object) | Computes the hash value of the specified byte array using the specified hash algorithm, and signs the resulting hash value. |
|
SignData(Stream, Object) | Computes the hash value of the specified input stream using the specified hash algorithm, and signs the resulting hash value. |
|
SignData(array<Byte[], Int32, Int32, Object) | Computes the hash value of a subset of the specified byte array using the specified hash algorithm, and signs the resulting hash value. |
|
SignHash | Computes the signature for the specified hash value by encrypting it with the private key. |
|
ToString | Returns a string that represents the current object. (Inherited from Object.) |
|
ToXmlString | Creates and returns an XML string containing the key of the current RSA object. (Inherited from RSA.) |
|
VerifyData | Verifies that a digital signature is valid by determining the hash value in the signature using the provided public key and comparing it to the hash value of the provided data. |
|
VerifyHash | Verifies that a digital signature is valid by determining the hash value in the signature using the provided public key and comparing it to the provided hash value. |
Top
Fields
| Name | Description | |
|---|---|---|
.gif "Protected field") |
KeySizeValue | Represents the size, in bits, of the key modulus used by the asymmetric algorithm. (Inherited from AsymmetricAlgorithm.) |
|
LegalKeySizesValue | Specifies the key sizes that are supported by the asymmetric algorithm. (Inherited from AsymmetricAlgorithm.) |
Top
Remarks
This is the default implementation of RSA.
.png "Silverlight for Windows Phone"){kind=icon}
In Silverlight for Windows Phone, the RSACryptoServiceProvider supports key lengths from 384 bits to 4800 bits in increments of 8 bits.
Interoperation with the Microsoft Cryptographic API (CAPI)
Unlike the RSA implementation in unmanaged CAPI, the RSACryptoServiceProvider class reverses the order of an encrypted array of bytes after encryption and before decryption. By default, data encrypted by the RSACryptoServiceProvider class cannot be decrypted by the CAPI CryptDecrypt function and data encrypted by the CAPI CryptEncrypt method cannot be decrypted by the RSACryptoServiceProvider class.
If you do not compensate for the reverse ordering when interoperating between APIs, the RSACryptoServiceProvider class throws a CryptographicException.
To interoperate with CAPI, you must manually reverse the order of encrypted bytes before the encrypted data interoperates with another API. You can easily reverse the order of a managed byte array by calling the Array.Reverse method.
Version Information
Silverlight for Windows Phone
Supported in: Windows Phone OS 7.1
Platforms
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.
Thread Safety
Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
See Also