// Determine if a DES key value is "semi-weak".
public static bool IsSemiWeakKey(byte[] rgbKey)
{
if (rgbKey == null || rgbKey.Length != 8)
{
throw new CryptographicException
(_("Crypto_InvalidKeySize"),
((rgbKey == null) ? 0 : rgbKey.Length).ToString());
}
return(CryptoMethods.IsSemiWeakKey(rgbKey, 0));
}
// Generate a random key value.
public override void GenerateKey()
{
byte[] key = new byte [8];
do
{
CryptoMethods.GenerateRandom(key, 0, 8);
}while(CryptoMethods.IsSemiWeakKey(key, 0) ||
CryptoMethods.IsWeakKey(key, 0));
if (KeyValue != null)
{
// Clear the previous key value.
Array.Clear(KeyValue, 0, KeyValue.Length);
}
KeyValue = key;
}