SymmetricAlgorithm.CreateEncryptor Method

Definition

Namespace:

System.Security.Cryptography

Assemblies:

netstandard.dll, System.Security.Cryptography.dll

Creates a symmetric encryptor object.

Overloads

CreateEncryptor()	Creates a symmetric encryptor object with the current Key property and initialization vector (IV).
CreateEncryptor(Byte[], Byte[])	When overridden in a derived class, creates a symmetric encryptor object with the specified Key property and initialization vector (IV).

CreateEncryptor()

Source:

SymmetricAlgorithm.cs

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

C#

public virtual System.Security.Cryptography.ICryptoTransform CreateEncryptor();

Returns

ICryptoTransform

A symmetric encryptor object.

Examples

The following example encrypts a string using the transform object returned from the CreateEncryptor method.

C#

using System;
using System.Security.Cryptography;
using System.Text;

class EncryptorExample
{
     private static string quote =
         "Things may come to those who wait, but only the " +
         "things left by those who hustle. -- Abraham Lincoln";

     public static void Main()
     {
         AesCryptoServiceProvider aesCSP = new AesCryptoServiceProvider();

         aesCSP.GenerateKey();
         aesCSP.GenerateIV();
         byte[] encQuote = EncryptString(aesCSP, quote);

         Console.WriteLine("Encrypted Quote:\n");
         Console.WriteLine(Convert.ToBase64String(encQuote));

         Console.WriteLine("\nDecrypted Quote:\n");
         Console.WriteLine(DecryptBytes(aesCSP, encQuote));
     }

     public static byte[] EncryptString(SymmetricAlgorithm symAlg, string inString)
     {
         byte[] inBlock = UnicodeEncoding.Unicode.GetBytes(inString);
         ICryptoTransform xfrm = symAlg.CreateEncryptor();
         byte[] outBlock = xfrm.TransformFinalBlock(inBlock, 0, inBlock.Length);

         return outBlock;
     }

     public static string DecryptBytes(SymmetricAlgorithm symAlg, byte[] inBytes)
     {
         ICryptoTransform xfrm = symAlg.CreateDecryptor();
         byte[] outBlock = xfrm.TransformFinalBlock(inBytes, 0, inBytes.Length);

         return UnicodeEncoding.Unicode.GetString(outBlock);
     }
}

Remarks

If the current Key property is null, the GenerateKey method is called to create a new random Key. If the current IV property is null, the GenerateIV method is called to create a new random IV.

Use the CreateDecryptor overload with the same signature to decrypt the result of this method.

See also

• Cryptographic Services

CreateEncryptor(Byte[], Byte[])

Source:

SymmetricAlgorithm.cs

When overridden in a derived class, creates a symmetric encryptor object with the specified Key property and initialization vector (IV).

C#

public abstract System.Security.Cryptography.ICryptoTransform CreateEncryptor(byte[] rgbKey, byte[]? rgbIV);

Parameters

rgbKey

Byte[]

The secret key to use for the symmetric algorithm.

rgbIV

Byte[]

The initialization vector to use for the symmetric algorithm.

Returns

ICryptoTransform

A symmetric encryptor object.

Remarks

Use the CreateDecryptor overload with the same parameters to decrypt the result of this method.

See also

• Cryptographic Services