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RijndaelManaged Class
Visual Studio 2010
Accesses the managed version of the Rijndael algorithm. This class cannot be inherited.
System::Object
System.Security.Cryptography::SymmetricAlgorithm
System.Security.Cryptography::Rijndael
System.Security.Cryptography::RijndaelManaged
System.Security.Cryptography::SymmetricAlgorithm
System.Security.Cryptography::Rijndael
System.Security.Cryptography::RijndaelManaged
Assembly: mscorlib (in mscorlib.dll)
The RijndaelManaged type exposes the following members.
| 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.) |
![]() | CreateDecryptor() | Creates a symmetric decryptor object with the current Key property and initialization vector (IV). (Inherited from SymmetricAlgorithm.) |
![]() | CreateDecryptor(array<Byte>, array<Byte>) | Creates a symmetric Rijndael decryptor object with the specified Key and initialization vector (IV). (Overrides SymmetricAlgorithm::CreateDecryptor(array<Byte>, array<Byte>).) |
![]() | CreateEncryptor() | Creates a symmetric encryptor object with the current Key property and initialization vector (IV). (Inherited from SymmetricAlgorithm.) |
![]() | CreateEncryptor(array<Byte>, array<Byte>) | Creates a symmetric Rijndael encryptor object with the specified Key and initialization vector (IV). (Overrides SymmetricAlgorithm::CreateEncryptor(array<Byte>, array<Byte>).) |
![]() | 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 | Generates a random initialization vector (IV) to be used for the algorithm. (Overrides SymmetricAlgorithm::GenerateIV().) |
![]() | GenerateKey | Generates a random Key to be used for the algorithm. (Overrides SymmetricAlgorithm::GenerateKey().) |
![]() | GetHashCode | Serves as a hash function for a particular type. (Inherited from Object.) |
![]() | GetType | Gets the Type of the current instance. (Inherited from Object.) |
![]() | MemberwiseClone | Creates a shallow copy of the current Object. (Inherited from Object.) |
![]() | ToString | Returns a string that represents the current object. (Inherited from Object.) |
![]() | ValidKeySize | 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.
| Topic | Location |
|---|---|
| How to: Decrypt XML Elements with Symmetric Keys | .NET Framework: Security |
| How to: Encrypt XML Elements with Symmetric Keys | .NET Framework: Security |
| How to: Decrypt XML Elements with Symmetric Keys | .NET Framework: Security |
| How to: Encrypt XML Elements with Symmetric Keys | .NET Framework: Security |
The following example demonstrates how to encrypt and decrypt sample data using the RijndaelManaged class.
#using <System.dll> using namespace System; using namespace System::IO; using namespace System::Security::Cryptography; class RijndaelMemoryExample { public: static array<Byte>^ encryptStringToBytes_AES(String^ plainText, array<Byte>^ Key, array<Byte>^ IV) { // Check arguments. if (!plainText || plainText->Length <= 0) throw gcnew ArgumentNullException("plainText"); if (!Key || Key->Length <= 0) throw gcnew ArgumentNullException("Key"); if (!IV || IV->Length <= 0) throw gcnew ArgumentNullException("IV"); // Declare the streams used // to encrypt to an in memory // array of bytes. MemoryStream^ msEncrypt; CryptoStream^ csEncrypt; StreamWriter^ swEncrypt; // Declare the RijndaelManaged object // used to encrypt the data. RijndaelManaged^ aesAlg; try { // Create a RijndaelManaged object // with the specified key and IV. aesAlg = gcnew RijndaelManaged(); aesAlg->Padding = PaddingMode::PKCS7; aesAlg->Key = Key; aesAlg->IV = IV; // Create an encryptor to perform the stream transform. ICryptoTransform^ encryptor = aesAlg->CreateEncryptor(aesAlg->Key, aesAlg->IV); // Create the streams used for encryption. msEncrypt = gcnew MemoryStream(); csEncrypt = gcnew CryptoStream(msEncrypt, encryptor, CryptoStreamMode::Write); swEncrypt = gcnew StreamWriter(csEncrypt); //Write all data to the stream. swEncrypt->Write(plainText); swEncrypt->Flush(); csEncrypt->FlushFinalBlock(); msEncrypt->Flush(); } finally { // Clean things up. // Close the streams. if(swEncrypt) swEncrypt->Close(); if (csEncrypt) csEncrypt->Close(); // Clear the RijndaelManaged object. if (aesAlg) aesAlg->Clear(); } // Return the encrypted bytes from the memory stream. return msEncrypt->ToArray(); } static String^ decryptStringFromBytes_AES(array<Byte>^ cipherText, array<Byte>^ Key, array<Byte>^ IV) { // Check arguments. if (!cipherText || cipherText->Length <= 0) throw gcnew ArgumentNullException("cipherText"); if (!Key || Key->Length <= 0) throw gcnew ArgumentNullException("Key"); if (!IV || IV->Length <= 0) throw gcnew ArgumentNullException("IV"); // TDeclare the streams used // to decrypt to an in memory // array of bytes. MemoryStream^ msDecrypt; CryptoStream^ csDecrypt; StreamReader^ srDecrypt; // Declare the RijndaelManaged object // used to decrypt the data. RijndaelManaged^ aesAlg; // Declare the string used to hold // the decrypted text. String^ plaintext; try { // Create a RijndaelManaged object // with the specified key and IV. aesAlg = gcnew RijndaelManaged(); aesAlg->Padding = PaddingMode::PKCS7; aesAlg->Key = Key; aesAlg->IV = IV; // Create a decrytor to perform the stream transform. ICryptoTransform^ decryptor = aesAlg->CreateDecryptor(aesAlg->Key, aesAlg->IV); // Create the streams used for decryption. msDecrypt = gcnew MemoryStream(cipherText); csDecrypt = gcnew CryptoStream(msDecrypt, decryptor, CryptoStreamMode::Read); srDecrypt = gcnew StreamReader(csDecrypt); // Read the decrypted bytes from the decrypting stream // and place them in a string. plaintext = srDecrypt->ReadToEnd(); } finally { // Clean things up. // Close the streams. if (srDecrypt) srDecrypt->Close(); if (csDecrypt) csDecrypt->Close(); if (msDecrypt) msDecrypt->Close(); // Clear the RijndaelManaged object. if (aesAlg) aesAlg->Clear(); } return plaintext; } }; int main() { try { String^ original = "Here is some data to encrypt!"; // Create a new instance of the RijndaelManaged // class. This generates a new key and initialization // vector (IV). RijndaelManaged^ myRijndael = gcnew RijndaelManaged(); // Encrypt the string to an array of bytes. array<Byte>^ encrypted = RijndaelMemoryExample::encryptStringToBytes_AES(original, myRijndael->Key, myRijndael->IV); // Decrypt the bytes to a string. String^ roundtrip = RijndaelMemoryExample::decryptStringFromBytes_AES(encrypted, myRijndael->Key, myRijndael->IV); //Display the original data and the decrypted data. Console::WriteLine("Original: {0}", original); Console::WriteLine("Round Trip: {0}", roundtrip); } catch (Exception^ e) { Console::WriteLine("Error: {0}", e->Message); } return 0; }
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
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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