Rfc2898DeriveBytes::GetBytes Method (Int32)
Returns the pseudo-random key for this object.
Assembly: mscorlib (in mscorlib.dll)
Parameters
- cb
-
Type:
System::Int32
The number of pseudo-random key bytes to generate.
| Exception | Condition |
|---|---|
| ArgumentOutOfRangeException | cb is out of range. This parameter requires a non-negative number. |
The Rfc2898DeriveBytes class implements PBKDF2 functionality by using a pseudorandom number generator based on HMACSHA1. The Rfc2898DeriveBytes class takes a password, a salt, and an iteration count, and then generates keys through calls to the GetBytes method. Repeated calls to this method will not generate the same key; instead, appending two calls of the GetBytes method with a cb parameter value of 20 is the equivalent of calling the GetBytes method once with a cb parameter value of 40.
The following example shows how to use the GetBytes method to get the key for an instance of Rfc2898DeriveBytes. This code example is part of a larger example provided for the Rfc2898DeriveBytes class.
try { Rfc2898DeriveBytes ^ k1 = gcnew Rfc2898DeriveBytes( pwd1,salt1,myIterations ); Rfc2898DeriveBytes ^ k2 = gcnew Rfc2898DeriveBytes( pwd1,salt1 ); // Encrypt the data. TripleDES^ encAlg = TripleDES::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 );
Available since 2.0
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0