SymmetricAlgorithm.Create Method ()


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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
Available since 1.1
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