private void UpdateMac(SipHash mac, byte[] input, int updateType)
{
switch (updateType)
{
case UPDATE_BYTES:
{
for (int i = 0; i < input.Length; ++i)
{
mac.Update(input[i]);
}
break;
}
case UPDATE_FULL:
{
mac.BlockUpdate(input, 0, input.Length);
break;
}
case UPDATE_MIX:
{
int step = System.Math.Max(1, input.Length / 3);
int pos = 0;
while (pos < input.Length)
{
mac.Update(input[pos++]);
int len = System.Math.Min(input.Length - pos, step);
mac.BlockUpdate(input, pos, len);
pos += len;
}
break;
}
default:
throw new InvalidOperationException();
}
}
public override void PerformTest()
{
byte[] key = Hex.Decode("000102030405060708090a0b0c0d0e0f");
byte[] input = Hex.Decode("000102030405060708090a0b0c0d0e");
long expected = unchecked ((long)0xa129ca6149be45e5);
SipHash mac = new SipHash();
mac.Init(new KeyParameter(key));
mac.BlockUpdate(input, 0, input.Length);
long result = mac.DoFinal();
if (expected != result)
{
Fail("Result does not match expected value for DoFinal()");
}
// NOTE: Little-endian representation of 0xa129ca6149be45e5
byte[] expectedBytes = Hex.Decode("e545be4961ca29a1");
mac.BlockUpdate(input, 0, input.Length);
byte[] output = new byte[mac.GetMacSize()];
int len = mac.DoFinal(output, 0);
if (len != output.Length)
{
Fail("Result length does not equal GetMacSize() for DoFinal(byte[],int)");
}
if (!AreEqual(expectedBytes, output))
{
Fail("Result does not match expected value for DoFinal(byte[],int)");
}
}
/// <summary>
/// テキストのハッシュを64ビット値で返す。
/// </summary>
/// <param name="text">テキスト</param>
/// <returns>テキストのハッシュ(64ビット)</returns>
public static long ComputeSipHash(string text)
{
//// 16バイトの鍵を生成する。
byte[] key = Encoding.ASCII.GetBytes("dWV9#LeZGa8eu7Hx");
SipHash mac = new SipHash();
mac.Init(new KeyParameter(key));
//// テキストのハッシュを算出する。
byte[] arrayOfText = Encoding.UTF8.GetBytes(text);
mac.BlockUpdate(arrayOfText, 0, arrayOfText.Length);
var result = mac.DoFinal();
return(result);
}