Rfc2898DeriveBytes.GetBytes(Int32) 方法

public:
 override cli::array <System::Byte> ^ GetBytes(int cb);

public override byte[] GetBytes (int cb);

override this.GetBytes : int -> byte[]

Public Overrides Function GetBytes (cb As Integer) As Byte()

參數

傳回

位元組陣列，以虛擬隨機金鑰位元組填入。

例外狀況

範例

下列範例示範如何使用 GetBytes 方法來取得 實例的 Rfc2898DeriveBytes 索引鍵。 此程式碼範例是提供給 類別之較大範例的 Rfc2898DeriveBytes 一部分。

try
{
   Rfc2898DeriveBytes ^ k1 = gcnew Rfc2898DeriveBytes( pwd1,salt1,myIterations );
   Rfc2898DeriveBytes ^ k2 = gcnew Rfc2898DeriveBytes( pwd1,salt1 );

   // Encrypt the data.
   Aes^ encAlg = Aes::Create();
   encAlg->Key = k1->GetBytes( 16 );
   MemoryStream^ encryptionStream = gcnew MemoryStream;
   CryptoStream^ encrypt = gcnew CryptoStream( encryptionStream,encAlg->CreateEncryptor(),CryptoStreamMode::Write );
   array<Byte>^utfD1 = (gcnew System::Text::UTF8Encoding( false ))->GetBytes( data1 );

            try
            {
                Rfc2898DeriveBytes k1 = new Rfc2898DeriveBytes(pwd1, salt1,
myIterations);
                Rfc2898DeriveBytes k2 = new Rfc2898DeriveBytes(pwd1, salt1);
                // Encrypt the data.
                Aes encAlg = Aes.Create();
                encAlg.Key = k1.GetBytes(16);
                MemoryStream encryptionStream = new MemoryStream();
                CryptoStream encrypt = new CryptoStream(encryptionStream,
encAlg.CreateEncryptor(), CryptoStreamMode.Write);
                byte[] utfD1 = new System.Text.UTF8Encoding(false).GetBytes(
data1);

Try
    Dim k1 As New Rfc2898DeriveBytes(pwd1, salt1, myIterations)
    Dim k2 As New Rfc2898DeriveBytes(pwd1, salt1)
    ' Encrypt the data.
    Dim encAlg As Aes = Aes.Create()
    encAlg.Key = k1.GetBytes(16)
    Dim encryptionStream As New MemoryStream()
    Dim encrypt As New CryptoStream(encryptionStream, encAlg.CreateEncryptor(), CryptoStreamMode.Write)
    Dim utfD1 As Byte() = New System.Text.UTF8Encoding(False).GetBytes(data1)

備註

類別 Rfc2898DeriveBytes 會實作 PBKDF2 功能，方法是使用以 為基礎的 HMACSHA1 虛擬亂數產生器。 類別 Rfc2898DeriveBytes 會採用密碼、salt 和反復專案計數，然後透過呼叫 GetBytes 方法來產生金鑰。 對這個方法的重複呼叫不會產生相同的索引鍵;相反地，使用 參數值 20 附加方法的 GetBytes 兩個 cb 呼叫，相當於使用 cb 參數值 40 呼叫 GetBytes 方法一次。

適用於

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