Rijndael Class
Represents the base class from which all implementations of the Rijndael symmetric encryption algorithm must inherit.
Assembly: mscorlib (in mscorlib.dll)
System.Security.Cryptography.SymmetricAlgorithm
System.Security.Cryptography.Rijndael
System.Security.Cryptography.RijndaelManaged
| Name | Description | |
|---|---|---|
![]() | Rijndael() | Initializes a new instance of Rijndael. |
| Name | Description | |
|---|---|---|
![]() | BlockSize | Gets or sets the block size, in bits, of the cryptographic operation.(Inherited from SymmetricAlgorithm.) |
![]() | FeedbackSize | Gets or sets the feedback size, in bits, of the cryptographic operation.(Inherited from SymmetricAlgorithm.) |
![]() | IV | Gets or sets the initialization vector (IV) for the symmetric algorithm.(Inherited from SymmetricAlgorithm.) |
![]() | Key | Gets or sets the secret key for the symmetric algorithm.(Inherited from SymmetricAlgorithm.) |
![]() | KeySize | Gets or sets the size, in bits, of the secret key used by the symmetric algorithm.(Inherited from SymmetricAlgorithm.) |
![]() | LegalBlockSizes | Gets the block sizes, in bits, that are supported by the symmetric algorithm.(Inherited from SymmetricAlgorithm.) |
![]() | LegalKeySizes | Gets the key sizes, in bits, that are supported by the symmetric algorithm.(Inherited from SymmetricAlgorithm.) |
![]() | Mode | Gets or sets the mode for operation of the symmetric algorithm.(Inherited from SymmetricAlgorithm.) |
![]() | Padding | Gets or sets the padding mode used in the symmetric algorithm.(Inherited from SymmetricAlgorithm.) |
| Name | Description | |
|---|---|---|
![]() | Clear() | Releases all resources used by the SymmetricAlgorithm class.(Inherited from SymmetricAlgorithm.) |
![]() ![]() | Create() | Creates a cryptographic object to perform the Rijndael algorithm. |
![]() ![]() | Create(String) | Creates a cryptographic object to perform the specified implementation of the Rijndael algorithm. |
![]() | CreateDecryptor() | Creates a symmetric decryptor object with the current Key property and initialization vector (IV).(Inherited from SymmetricAlgorithm.) |
![]() | CreateDecryptor(Byte(), Byte()) | When overridden in a derived class, creates a symmetric decryptor object with the specified Key property and initialization vector (IV).(Inherited from SymmetricAlgorithm.) |
![]() | CreateEncryptor() | Creates a symmetric encryptor object with the current Key property and initialization vector (IV).(Inherited from SymmetricAlgorithm.) |
![]() | CreateEncryptor(Byte(), Byte()) | When overridden in a derived class, creates a symmetric encryptor object with the specified Key property and initialization vector (IV).(Inherited from SymmetricAlgorithm.) |
![]() | Dispose() | Releases all resources used by the current instance of the SymmetricAlgorithm class.(Inherited from SymmetricAlgorithm.) |
![]() | Dispose(Boolean) | Releases the unmanaged resources used by the SymmetricAlgorithm and optionally releases the managed resources.(Inherited from SymmetricAlgorithm.) |
![]() | Equals(Object) | Determines whether the specified object is equal to the current object.(Inherited from Object.) |
![]() | Finalize() | Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.(Inherited from Object.) |
![]() | GenerateIV() | When overridden in a derived class, generates a random initialization vector (IV) to use for the algorithm.(Inherited from SymmetricAlgorithm.) |
![]() | GenerateKey() | When overridden in a derived class, generates a random key (Key) to use for the algorithm. (Inherited from SymmetricAlgorithm.) |
![]() | GetHashCode() | Serves as the default hash function. (Inherited from Object.) |
![]() | GetType() | |
![]() | MemberwiseClone() | |
![]() | ToString() | Returns a string that represents the current object.(Inherited from Object.) |
![]() | ValidKeySize(Int32) | Determines whether the specified key size is valid for the current algorithm.(Inherited from SymmetricAlgorithm.) |
| Name | Description | |
|---|---|---|
![]() | BlockSizeValue | Represents the block size, in bits, of the cryptographic operation.(Inherited from SymmetricAlgorithm.) |
![]() | FeedbackSizeValue | Represents the feedback size, in bits, of the cryptographic operation.(Inherited from SymmetricAlgorithm.) |
![]() | IVValue | Represents the initialization vector (IV) for the symmetric algorithm.(Inherited from SymmetricAlgorithm.) |
![]() | KeySizeValue | Represents the size, in bits, of the secret key used by the symmetric algorithm.(Inherited from SymmetricAlgorithm.) |
![]() | KeyValue | Represents the secret key for the symmetric algorithm.(Inherited from SymmetricAlgorithm.) |
![]() | LegalBlockSizesValue | Specifies the block sizes, in bits, that are supported by the symmetric algorithm.(Inherited from SymmetricAlgorithm.) |
![]() | LegalKeySizesValue | Specifies the key sizes, in bits, that are supported by the symmetric algorithm.(Inherited from SymmetricAlgorithm.) |
![]() | ModeValue | Represents the cipher mode used in the symmetric algorithm.(Inherited from SymmetricAlgorithm.) |
![]() | PaddingValue | Represents the padding mode used in the symmetric algorithm.(Inherited from SymmetricAlgorithm.) |
This algorithm supports key lengths of 128, 192, or 256 bits; defaulting to 256 bits. This algorithm supports block sizes of 128, 192, or 256 bits; defaulting to 128 bits (Aes-compatible).
The Rijndael class is the predecessor of the Aes algorithm. You should use the Aes algorithm instead of Rijndael. For more information, see the entry The Differences Between Rijndael and AES in the .NET Security blog.
The following code example uses the Rijndael class to encrypt and then decrypt data.
Imports System Imports System.IO Imports System.Security.Cryptography Class RijndaelExample Public Shared Sub Main() Try Dim original As String = "Here is some data to encrypt!" ' Create a new instance of the Rijndael ' class. This generates a new key and initialization ' vector (IV). Using myRijndael = Rijndael.Create() ' Encrypt the string to an array of bytes. Dim encrypted As Byte() = EncryptStringToBytes(original, myRijndael.Key, myRijndael.IV) ' Decrypt the bytes to a string. Dim roundtrip As String = DecryptStringFromBytes(encrypted, myRijndael.Key, myRijndael.IV) 'Display the original data and the decrypted data. Console.WriteLine("Original: {0}", original) Console.WriteLine("Round Trip: {0}", roundtrip) End Using Catch e As Exception Console.WriteLine("Error: {0}", e.Message) End Try End Sub 'Main Shared Function EncryptStringToBytes(ByVal plainText As String, ByVal Key() As Byte, ByVal IV() As Byte) As Byte() ' Check arguments. If plainText Is Nothing OrElse plainText.Length <= 0 Then Throw New ArgumentNullException("plainText") End If If Key Is Nothing OrElse Key.Length <= 0 Then Throw New ArgumentNullException("Key") End If If IV Is Nothing OrElse IV.Length <= 0 Then Throw New ArgumentNullException("IV") End If Dim encrypted() As Byte ' Create an Rijndael object ' with the specified key and IV. Using rijAlg = Rijndael.Create() rijAlg.Key = Key rijAlg.IV = IV ' Create an encryptor to perform the stream transform. Dim encryptor As ICryptoTransform = rijAlg.CreateEncryptor(rijAlg.Key, rijAlg.IV) ' Create the streams used for encryption. Using msEncrypt As New MemoryStream() Using csEncrypt As New CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write) Using swEncrypt As New StreamWriter(csEncrypt) 'Write all data to the stream. swEncrypt.Write(plainText) End Using encrypted = msEncrypt.ToArray() End Using End Using End Using ' Return the encrypted bytes from the memory stream. Return encrypted End Function 'EncryptStringToBytes Shared Function DecryptStringFromBytes(ByVal cipherText() As Byte, ByVal Key() As Byte, ByVal IV() As Byte) As String ' Check arguments. If cipherText Is Nothing OrElse cipherText.Length <= 0 Then Throw New ArgumentNullException("cipherText") End If If Key Is Nothing OrElse Key.Length <= 0 Then Throw New ArgumentNullException("Key") End If If IV Is Nothing OrElse IV.Length <= 0 Then Throw New ArgumentNullException("IV") End If ' Declare the string used to hold ' the decrypted text. Dim plaintext As String = Nothing ' Create an Rijndael object ' with the specified key and IV. Using rijAlg = Rijndael.Create() rijAlg.Key = Key rijAlg.IV = IV ' Create a decryptor to perform the stream transform. Dim decryptor As ICryptoTransform = rijAlg.CreateDecryptor(rijAlg.Key, rijAlg.IV) ' Create the streams used for decryption. Using msDecrypt As New MemoryStream(cipherText) Using csDecrypt As New CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read) Using srDecrypt As New StreamReader(csDecrypt) ' Read the decrypted bytes from the decrypting stream ' and place them in a string. plaintext = srDecrypt.ReadToEnd() End Using End Using End Using End Using Return plaintext End Function 'DecryptStringFromBytes End Class
Available since 1.1
Any public static ( Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.




