protected override void InitCipher(byte[] iv, bool isEncrypt)
{
base.InitCipher(iv, isEncrypt);
_crypto?.Dispose();
if (cipherFamily == CipherFamily.Rc4Md5)
{
Span <byte> temp = stackalloc byte[keyLen + ivLen];
var realKey = new byte[MD5Length];
key.CopyTo(temp);
iv.CopyTo(temp.Slice(keyLen));
MD5Utils.Fast440(temp, realKey);
_crypto = StreamCryptoCreate.Rc4(realKey);
return;
}
_crypto = cipherFamily switch
{
CipherFamily.AesCfb => StreamCryptoCreate.AesCfb(isEncrypt, key, iv),
CipherFamily.Chacha20 => StreamCryptoCreate.ChaCha20(key, iv),
CipherFamily.Rc4 => StreamCryptoCreate.Rc4(key),
_ => throw new NotSupportedException()
};
}
private static void Test(IStreamCrypto crypto, int originSize, string hex, string hex2)
{
Assert.AreEqual(@"RC4", crypto.Name);
Span <byte> h1 = hex.FromHex();
Span <byte> h2 = hex2.FromHex();
Span <byte> i = new byte[originSize];
Span <byte> o = stackalloc byte[i.Length];
crypto.Update(i, o);
Assert.IsTrue(o.SequenceEqual(h1));
crypto.Update(i, o);
Assert.IsTrue(o.SequenceEqual(h2));
crypto.Reset();
crypto.Update(h1, o);
Assert.IsTrue(o.SequenceEqual(i));
crypto.Update(h2, o);
Assert.IsTrue(o.SequenceEqual(i));
crypto.Dispose();
}
private static void Test(IStreamCrypto crypto, Span <byte> origin)
{
Span <byte> o = stackalloc byte[origin.Length];
crypto.Update(origin, o);
crypto.Dispose();
}
private static void Test(IStreamCrypto crypto, string hex, string hex2)
{
Assert.AreEqual(@"AES-CFB", crypto.Name);
Span <byte> h1 = hex.FromHex();
Span <byte> h2 = hex2.FromHex();
Span <byte> o = stackalloc byte[h1.Length];
crypto.Update(h1, o);
Assert.IsTrue(o.SequenceEqual(h2));
crypto.Reset();
crypto.Update(h1.Slice(0, 73), o);
crypto.Update(h1.Slice(73), o.Slice(73));
Assert.IsTrue(o.SequenceEqual(h2));
crypto.Dispose();
}
private const int Step = 1 * 1024 * 1024; // 1 MB
public static void Test(IStreamCrypto crypto)
{
ReadOnlySpan <byte> i = new byte[Step];
Span <byte> o = new byte[Step];
var sw = Stopwatch.StartNew();
var length = 0ul;
do
{
crypto.Update(i, o);
++length;
} while (sw.ElapsedMilliseconds < 2000);
sw.Stop();
crypto.Dispose();
var result = length * Step / sw.Elapsed.TotalSeconds / 1024.0 / 1024.0;
Console.WriteLine($@"{result:F2} MB/s");
}
public void Test(IStreamCrypto crypto)
{
Span <byte> o = new byte[_step];
ulong length = 0ul;
double totalSeconds = 0.0;
do
{
ReadOnlySpan <byte> i = RandomNumberGenerator.GetBytes(_step);
Stopwatch sw = Stopwatch.StartNew();
crypto.Update(i, o);
sw.Stop();
totalSeconds += sw.Elapsed.TotalSeconds;
++length;
} while (totalSeconds < _duration);
crypto.Dispose();
double result = length * (ulong)_step / totalSeconds / 1024.0 / 1024.0;
Console.WriteLine($@"{result:F2} MB/s");
}
protected virtual void InitCipher(bool isEncrypt)
{
Crypto?.Dispose();
Crypto = CreateCrypto(isEncrypt, KeySpan, IvSpan);
}