public static byte[] ExtractDESKeyMaterial(short keyLength, IKey clearDESKey)
{
String keyAlg = clearDESKey.GetAlgorithm();
String keyFormat = clearDESKey.GetFormat();
if (keyFormat.CompareTo("RAW") != 0)
{
throw new Exception("Unsupported DES key encoding format: " + keyFormat);
}
if (!keyAlg.StartsWith(ALG_DES))
{
throw new Exception("Unsupported key algorithm: " + keyAlg);
}
byte[] clearKeyBytes = clearDESKey.GetEncoded();
clearKeyBytes = Util.Trim(clearKeyBytes, GetBytesLength(keyLength));
return(clearKeyBytes);
}