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SymmetricAlgorithm.Create Method

Creates a default cryptographic object used to perform the symmetric algorithm.

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

public static SymmetricAlgorithm Create()

Return Value

Type: System.Security.Cryptography.SymmetricAlgorithm
A default cryptographic object used to perform the symmetric algorithm.

The following code example uses the RijndaelManaged class with the specified Key property and initialization vector (IV) to encrypt a file specified by inName, and outputs the encrypted result to the file specified by outName. The desKey and desIV parameters to the method are 8-byte arrays. You must have the high encryption pack installed to run this example.

private static void EncryptData(String inName, String outName, byte[] rijnKey, byte[] rijnIV)
     //Create the file streams to handle the input and output files.
     FileStream fin = new FileStream(inName, FileMode.Open, FileAccess.Read);
     FileStream fout = new FileStream(outName, FileMode.OpenOrCreate, FileAccess.Write);

     //Create variables to help with read and write. 
     byte[] bin = new byte[100]; //This is intermediate storage for the encryption. 
     long rdlen = 0;              //This is the total number of bytes written. 
     long totlen = fin.Length;    //This is the total length of the input file. 
     int len;                     //This is the number of bytes to be written at a time.

     SymmetricAlgorithm rijn = SymmetricAlgorithm.Create(); //Creates the default implementation, which is RijndaelManaged.         
     CryptoStream encStream = new CryptoStream(fout, rijn.CreateEncryptor(rijnKey, rijnIV), CryptoStreamMode.Write);


     //Read from the input file, then encrypt and write to the output file. 
     while(rdlen < totlen)
         len = fin.Read(bin, 0, 100);
         encStream.Write(bin, 0, len);
         rdlen = rdlen + len;
         Console.WriteLine("{0} bytes processed", rdlen);


.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

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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