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AesManaged.CreateEncryptor Method (Byte[], Byte[])

Updated: March 2011

Creates a symmetric encryptor object using the specified key and initialization vector (IV).

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

public override ICryptoTransform CreateEncryptor(
	byte[] key,
	byte[] iv
)

Parameters

key
Type: System.Byte[]

The secret key to use for the symmetric algorithm.

iv
Type: System.Byte[]

The initialization vector to use for the symmetric algorithm.

Return Value

Type: System.Security.Cryptography.ICryptoTransform
A symmetric encryptor object.

The following example shows how to use the CreateEncryptor(Byte[], Byte[]) method to encrypt a message. This code example is part of a larger example provided for the AesManaged class.

static byte[] EncryptStringToBytes_Aes(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("Key");
    byte[] encrypted;
    // Create an AesManaged object 
    // with the specified key and IV. 
    using (AesManaged aesAlg = new AesManaged())
    {
        aesAlg.Key = Key;
        aesAlg.IV = IV;

        // Create a decrytor to perform the stream transform.
        ICryptoTransform encryptor = aesAlg.CreateEncryptor(aesAlg.Key, aesAlg.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;

}

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5

Date

History

Reason

March 2011

Added example.

Information enhancement.

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