RijndaelManaged Class

Definition

Caution

The Rijndael and RijndaelManaged types are obsolete. Use Aes instead.

Accesses the managed version of the Rijndael algorithm. This class cannot be inherited.

[System.Runtime.Versioning.UnsupportedOSPlatform("browser")]
public sealed class RijndaelManaged : System.Security.Cryptography.Rijndael
[System.Runtime.Versioning.UnsupportedOSPlatform("browser")]
[System.Obsolete("The Rijndael and RijndaelManaged types are obsolete. Use Aes instead.", DiagnosticId="SYSLIB0022", UrlFormat="https://aka.ms/dotnet-warnings/{0}")]
public sealed class RijndaelManaged : System.Security.Cryptography.Rijndael
public sealed class RijndaelManaged : System.Security.Cryptography.Rijndael
[System.Runtime.InteropServices.ComVisible(true)]
public sealed class RijndaelManaged : System.Security.Cryptography.Rijndael
Inheritance
Attributes

Examples

The following example demonstrates how to encrypt and decrypt sample data using the RijndaelManaged class.

using System;
using System.IO;
using System.Security.Cryptography;

namespace RijndaelManaged_Example
{
    class RijndaelExample
    {
        public static void 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).
                using (RijndaelManaged myRijndael = new RijndaelManaged())
                {

                    myRijndael.GenerateKey();
                    myRijndael.GenerateIV();
                    // Encrypt the string to an array of bytes.
                    byte[] encrypted = EncryptStringToBytes(original, myRijndael.Key, myRijndael.IV);

                    // Decrypt the bytes to a string.
                    string roundtrip = 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);
                }
            }
            catch (Exception e)
            {
                Console.WriteLine("Error: {0}", e.Message);
            }
        }
        static byte[] EncryptStringToBytes(string plainText, byte[] Key, byte[] IV)
        {
            // Check arguments.
            if (plainText == null || plainText.Length <= 0)
                throw new ArgumentNullException("plainText");
            if (Key == null || Key.Length <= 0)
                throw new ArgumentNullException("Key");
            if (IV == null || IV.Length <= 0)
                throw new ArgumentNullException("IV");
            byte[] encrypted;
            // Create an RijndaelManaged object
            // with the specified key and IV.
            using (RijndaelManaged rijAlg = new RijndaelManaged())
            {
                rijAlg.Key = Key;
                rijAlg.IV = IV;

                // Create an encryptor to perform the stream transform.
                ICryptoTransform encryptor = rijAlg.CreateEncryptor(rijAlg.Key, rijAlg.IV);

                // Create the streams used for encryption.
                using (MemoryStream msEncrypt = new MemoryStream())
                {
                    using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
                    {
                        using (StreamWriter swEncrypt = new StreamWriter(csEncrypt))
                        {

                            //Write all data to the stream.
                            swEncrypt.Write(plainText);
                        }
                    }

                    encrypted = msEncrypt.ToArray();
                }
            }

            // Return the encrypted bytes from the memory stream.
            return encrypted;
        }

        static string DecryptStringFromBytes(byte[] cipherText, byte[] Key, byte[] IV)
        {
            // Check arguments.
            if (cipherText == null || cipherText.Length <= 0)
                throw new ArgumentNullException("cipherText");
            if (Key == null || Key.Length <= 0)
                throw new ArgumentNullException("Key");
            if (IV == null || IV.Length <= 0)
                throw new ArgumentNullException("IV");

            // Declare the string used to hold
            // the decrypted text.
            string plaintext = null;

            // Create an RijndaelManaged object
            // with the specified key and IV.
            using (RijndaelManaged rijAlg = new RijndaelManaged())
            {
                rijAlg.Key = Key;
                rijAlg.IV = IV;

                // Create a decryptor to perform the stream transform.
                ICryptoTransform decryptor = rijAlg.CreateDecryptor(rijAlg.Key, rijAlg.IV);

                // Create the streams used for decryption.
                using (MemoryStream msDecrypt = new MemoryStream(cipherText))
                {
                    using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
                    {
                        using (StreamReader srDecrypt = new StreamReader(csDecrypt))
                        {
                            // Read the decrypted bytes from the decrypting stream
                            // and place them in a string.
                            plaintext = srDecrypt.ReadToEnd();
                        }
                    }
                }
            }

            return plaintext;
        }
    }
}

Remarks

This algorithm supports key lengths of 128, 192, or 256 bits; defaulting to 256 bits. In .NET Framework, this algorithm supports block sizes of 128, 192, or 256 bits; defaulting to 128 bits (Aes-compatible). In .NET Core, it is the same as AES and supports only a 128-bit block size.

Important

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.

Constructors

RijndaelManaged()

Initializes a new instance of the RijndaelManaged class.

Fields

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)

Properties

BlockSize

Gets or sets the block size, in bits, of the cryptographic operation.

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 for the Cipher Feedback (CFB) and Output Feedback (OFB) cipher modes.

FeedbackSize

Gets or sets the feedback size, in bits, of the cryptographic operation for the Cipher Feedback (CFB) and Output Feedback (OFB) cipher modes.

(Inherited from SymmetricAlgorithm)
IV

Gets or sets the initialization vector (IV) to use for the symmetric algorithm.

IV

Gets or sets the initialization vector (IV) for the symmetric algorithm.

(Inherited from SymmetricAlgorithm)
Key

Gets or sets the secret key used for the symmetric algorithm.

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 for the symmetric algorithm.

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.

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.

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.

Padding

Gets or sets the padding mode used in the symmetric algorithm.

(Inherited from SymmetricAlgorithm)

Methods

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).

CreateDecryptor()

Creates a symmetric decryptor object with the current Key property and initialization vector (IV).

(Inherited from SymmetricAlgorithm)
CreateDecryptor(Byte[], Byte[])

Creates a symmetric Rijndael decryptor object with the specified Key and initialization vector (IV).

CreateEncryptor()

Creates a symmetric encryptor object with the current Key property and initialization vector (IV).

CreateEncryptor()

Creates a symmetric encryptor object with the current Key property and initialization vector (IV).

(Inherited from SymmetricAlgorithm)
CreateEncryptor(Byte[], Byte[])

Creates a symmetric Rijndael encryptor object with the specified Key and initialization vector (IV).

DecryptCbc(Byte[], Byte[], PaddingMode)

Decrypts data using CBC mode with the specified padding mode.

(Inherited from SymmetricAlgorithm)
DecryptCbc(ReadOnlySpan<Byte>, ReadOnlySpan<Byte>, PaddingMode)

Decrypts data using CBC mode with the specified padding mode.

(Inherited from SymmetricAlgorithm)
DecryptCbc(ReadOnlySpan<Byte>, ReadOnlySpan<Byte>, Span<Byte>, PaddingMode)

Decrypts data into the specified buffer, using CBC mode with the specified padding mode.

(Inherited from SymmetricAlgorithm)
DecryptCfb(Byte[], Byte[], PaddingMode, Int32)

Decrypts data using CFB mode with the specified padding mode and feedback size.

(Inherited from SymmetricAlgorithm)
DecryptCfb(ReadOnlySpan<Byte>, ReadOnlySpan<Byte>, PaddingMode, Int32)

Decrypts data using CFB mode with the specified padding mode and feedback size.

(Inherited from SymmetricAlgorithm)
DecryptCfb(ReadOnlySpan<Byte>, ReadOnlySpan<Byte>, Span<Byte>, PaddingMode, Int32)

Decrypts data into the specified buffer, using CFB mode with the specified padding mode and feedback size.

(Inherited from SymmetricAlgorithm)
DecryptEcb(Byte[], PaddingMode)

Decrypts data using ECB mode with the specified padding mode.

(Inherited from SymmetricAlgorithm)
DecryptEcb(ReadOnlySpan<Byte>, PaddingMode)

Decrypts data using ECB mode with the specified padding mode.

(Inherited from SymmetricAlgorithm)
DecryptEcb(ReadOnlySpan<Byte>, Span<Byte>, PaddingMode)

Decrypts data into the specified buffer, using ECB mode with the specified padding mode.

(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)
EncryptCbc(Byte[], Byte[], PaddingMode)

Encrypts data using CBC mode with the specified padding mode.

(Inherited from SymmetricAlgorithm)
EncryptCbc(ReadOnlySpan<Byte>, ReadOnlySpan<Byte>, PaddingMode)

Encrypts data using CBC mode with the specified padding mode.

(Inherited from SymmetricAlgorithm)
EncryptCbc(ReadOnlySpan<Byte>, ReadOnlySpan<Byte>, Span<Byte>, PaddingMode)

Encrypts data into the specified buffer, using CBC mode with the specified padding mode.

(Inherited from SymmetricAlgorithm)
EncryptCfb(Byte[], Byte[], PaddingMode, Int32)

Encrypts data using CFB mode with the specified padding mode and feedback size.

(Inherited from SymmetricAlgorithm)
EncryptCfb(ReadOnlySpan<Byte>, ReadOnlySpan<Byte>, PaddingMode, Int32)

Encrypts data using CFB mode with the specified padding mode and feedback size.

(Inherited from SymmetricAlgorithm)
EncryptCfb(ReadOnlySpan<Byte>, ReadOnlySpan<Byte>, Span<Byte>, PaddingMode, Int32)

Encrypts data into the specified buffer, using CFB mode with the specified padding mode and feedback size.

(Inherited from SymmetricAlgorithm)
EncryptEcb(Byte[], PaddingMode)

Encrypts data using ECB mode with the specified padding mode.

(Inherited from SymmetricAlgorithm)
EncryptEcb(ReadOnlySpan<Byte>, PaddingMode)

Encrypts data using ECB mode with the specified padding mode.

(Inherited from SymmetricAlgorithm)
EncryptEcb(ReadOnlySpan<Byte>, Span<Byte>, PaddingMode)

Encrypts data into the specified buffer, using ECB mode with the specified padding mode.

(Inherited from SymmetricAlgorithm)
Equals(Object)

Determines whether the specified object is equal to the current object.

(Inherited from Object)
GenerateIV()

Generates a random initialization vector (IV) to be used for the algorithm.

GenerateKey()

Generates a random Key to be used for the algorithm.

GetCiphertextLengthCbc(Int32, PaddingMode)

Gets the length of a ciphertext with a given padding mode and plaintext length in CBC mode.

(Inherited from SymmetricAlgorithm)
GetCiphertextLengthCfb(Int32, PaddingMode, Int32)

Gets the length of a ciphertext with a given padding mode and plaintext length in CFB mode.

(Inherited from SymmetricAlgorithm)
GetCiphertextLengthEcb(Int32, PaddingMode)

Gets the length of a ciphertext with a given padding mode and plaintext length in ECB mode.

(Inherited from SymmetricAlgorithm)
GetHashCode()

Serves as the default hash function.

(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)
TryDecryptCbc(ReadOnlySpan<Byte>, ReadOnlySpan<Byte>, Span<Byte>, Int32, PaddingMode)

Attempts to decrypt data into the specified buffer, using CBC mode with the specified padding mode.

(Inherited from SymmetricAlgorithm)
TryDecryptCbcCore(ReadOnlySpan<Byte>, ReadOnlySpan<Byte>, Span<Byte>, PaddingMode, Int32)

When overridden in a derived class, attempts to decrypt data into the specified buffer, using CBC mode with the specified padding mode.

(Inherited from SymmetricAlgorithm)
TryDecryptCfb(ReadOnlySpan<Byte>, ReadOnlySpan<Byte>, Span<Byte>, Int32, PaddingMode, Int32)

Attempts to decrypt data into the specified buffer, using CFB mode with the specified padding mode and feedback size.

(Inherited from SymmetricAlgorithm)
TryDecryptCfbCore(ReadOnlySpan<Byte>, ReadOnlySpan<Byte>, Span<Byte>, PaddingMode, Int32, Int32)

When overridden in a derived class, attempts to decrypt data into the specified buffer, using CFB mode with the specified padding mode and feedback size.

(Inherited from SymmetricAlgorithm)
TryDecryptEcb(ReadOnlySpan<Byte>, Span<Byte>, PaddingMode, Int32)

Attempts to decrypt data into the specified buffer, using ECB mode with the specified padding mode.

(Inherited from SymmetricAlgorithm)
TryDecryptEcbCore(ReadOnlySpan<Byte>, Span<Byte>, PaddingMode, Int32)

When overridden in a derived class, attempts to decrypt data into the specified buffer, using ECB mode with the specified padding mode.

(Inherited from SymmetricAlgorithm)
TryEncryptCbc(ReadOnlySpan<Byte>, ReadOnlySpan<Byte>, Span<Byte>, Int32, PaddingMode)

Attempts to encrypt data into the specified buffer, using CBC mode with the specified padding mode.

(Inherited from SymmetricAlgorithm)
TryEncryptCbcCore(ReadOnlySpan<Byte>, ReadOnlySpan<Byte>, Span<Byte>, PaddingMode, Int32)

When overridden in a derived class, attempts to encrypt data into the specified buffer, using CBC mode with the specified padding mode.

(Inherited from SymmetricAlgorithm)
TryEncryptCfb(ReadOnlySpan<Byte>, ReadOnlySpan<Byte>, Span<Byte>, Int32, PaddingMode, Int32)

Attempts to encrypt data into the specified buffer, using CFB mode with the specified padding mode and feedback size.

(Inherited from SymmetricAlgorithm)
TryEncryptCfbCore(ReadOnlySpan<Byte>, ReadOnlySpan<Byte>, Span<Byte>, PaddingMode, Int32, Int32)

When overridden in a derived class, attempts to encrypt data into the specified buffer, using CFB mode with the specified padding mode and feedback size.

(Inherited from SymmetricAlgorithm)
TryEncryptEcb(ReadOnlySpan<Byte>, Span<Byte>, PaddingMode, Int32)

Attempts to encrypt data into the specified buffer, using ECB mode with the specified padding mode.

(Inherited from SymmetricAlgorithm)
TryEncryptEcbCore(ReadOnlySpan<Byte>, Span<Byte>, PaddingMode, Int32)

When overridden in a derived class, attempts to encrypt data into the specified buffer, using ECB mode with the specified padding mode.

(Inherited from SymmetricAlgorithm)
ValidKeySize(Int32)

Determines whether the specified key size is valid for the current algorithm.

(Inherited from SymmetricAlgorithm)

Explicit Interface Implementations

IDisposable.Dispose()

This API supports the product infrastructure and is not intended to be used directly from your code.

Releases the unmanaged resources used by the SymmetricAlgorithm and optionally releases the managed resources.

(Inherited from SymmetricAlgorithm)

Applies to

Product Versions (Obsolete)
.NET Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5 (6, 7, 8, 9)
.NET Framework 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
.NET Standard 2.0, 2.1

See also