public static void InvalidCFBFeedbackSizes(int feedbackSize, bool discoverableInSetter)
{
using (RC2 rc2 = RC2Factory.Create())
{
rc2.GenerateKey();
rc2.Mode = CipherMode.CFB;
if (discoverableInSetter)
{
// there are some key sizes that are invalid for any of the modes,
// so the exception is thrown in the setter
Assert.Throws <CryptographicException>(() =>
{
rc2.FeedbackSize = feedbackSize;
});
}
else
{
rc2.FeedbackSize = feedbackSize;
// however, for CFB only few sizes are valid. Those should throw in the
// actual RC2 instantiation.
Assert.Throws <CryptographicException>(() => rc2.CreateDecryptor());
Assert.Throws <CryptographicException>(() => rc2.CreateEncryptor());
}
}
}
/// <summary>
/// 获得密钥
/// </summary>
/// <returns> 密钥 </returns>
private byte[] GetLegalKey()
{
string sTemp = Key;
rc.GenerateKey();
byte[] bytTemp = rc.Key;
int KeyLength = bytTemp.Length;
if (sTemp.Length > KeyLength)
{
sTemp = sTemp.Substring(0, KeyLength);
}
else if (sTemp.Length < KeyLength)
{
sTemp = sTemp.PadRight(KeyLength, ' ');
}
return(ASCIIEncoding.ASCII.GetBytes(sTemp));
}
private void encode_RC2_CBF_Click(object sender, EventArgs e)
{
DateTime then = DateTime.Now;
String Data = input7.Text;
try
{
MemoryStream mStream = new MemoryStream();
RC2 alg = RC2.Create();
alg.GenerateKey();
Key = alg.Key;
alg.GenerateIV();
IV = alg.IV;
CryptoStream cStream = new CryptoStream(mStream,
alg.CreateEncryptor(Key, IV),
CryptoStreamMode.Write);
byte[] toEncrypt = new ASCIIEncoding().GetBytes(Data);
cStream.Write(toEncrypt, 0, toEncrypt.Length);
cStream.FlushFinalBlock();
byte[] ret = mStream.ToArray();
cStream.Close();
mStream.Close();
cipherbytes = ret;
input8.Text = Encoding.UTF8.GetString(cipherbytes);
delta4.Text = (DateTime.Now - then).TotalSeconds.ToString() + " сек";
}
catch (CryptographicException ex)
{
Console.WriteLine("A Cryptographic error occurred: {0}", ex.Message);
return;
}
}
public string CreateRC2Key()
{
rc2.GenerateKey();
return(ByteToString(rc2.Key));
}
