private void PushByte(uint value)
{
var data = pending;
unsafe
{
((byte *)&data)[pendingLength] = (byte)value;
}
if (pendingLength == 15)
{
HashBlock(ref hash, ref data);
pending = default(Value128);
pendingLength = 0;
}
else
{
pending = data;
pendingLength++;
}
}
/// <summary>NOTE: Rewrites hash and clobbers data</summary>
private static void HashBlock(ref Value128 hash, ref Value128 data)
{
data.v1 *= c1;
data.v1 = ROTL32(data.v1, 15);
data.v1 *= c2;
hash.v1 ^= data.v1;
hash.v1 = ROTL32(hash.v1, 19);
hash.v1 += hash.v2;
hash.v1 = hash.v1 * 5 + 0x561ccd1b;
data.v2 *= c2;
data.v2 = ROTL32(data.v2, 16);
data.v2 *= c3;
hash.v2 ^= data.v2;
hash.v2 = ROTL32(hash.v2, 17);
hash.v2 += hash.v3;
hash.v2 = hash.v2 * 5 + 0x0bcaa747;
data.v3 *= c3;
data.v3 = ROTL32(data.v3, 17);
data.v3 *= c4;
hash.v3 ^= data.v3;
hash.v3 = ROTL32(hash.v3, 15);
hash.v3 += hash.v4;
hash.v3 = hash.v3 * 5 + 0x96cd1c35;
data.v4 *= c4;
data.v4 = ROTL32(data.v4, 18);
data.v4 *= c1;
hash.v4 ^= data.v4;
hash.v4 = ROTL32(hash.v4, 13);
hash.v4 += hash.v1;
hash.v4 = hash.v4 * 5 + 0x32ac3b17;
}
/// <summary>NOTE: Rewrites hash and clobbers tail</summary>
private static void HashTailAndFinalize(ref Value128 hash, ref Value128 tail, uint length)
{
// NOTE: We're truncating length to 32-bits, because it will almost always be small enough
//
// Tail:
var tailLength = length & 15;
switch ((tailLength + 3) >> 2) // Number of dwords of data in the tail, rounded up
{
case 4:
tail.v4 *= c4;
tail.v4 = ROTL32(tail.v4, 18);
tail.v4 *= c1;
hash.v4 ^= tail.v4;
goto case 3;
case 3:
tail.v3 *= c3;
tail.v3 = ROTL32(tail.v3, 17);
tail.v3 *= c4;
hash.v3 ^= tail.v3;
goto case 2;
case 2:
tail.v2 *= c2;
tail.v2 = ROTL32(tail.v2, 16);
tail.v2 *= c3;
hash.v2 ^= tail.v2;
goto case 1;
case 1:
tail.v1 *= c1;
tail.v1 = ROTL32(tail.v1, 15);
tail.v1 *= c2;
hash.v1 ^= tail.v1;
break;
}
//
// Finalization:
hash.v1 ^= length;
hash.v2 ^= length;
hash.v3 ^= length;
hash.v4 ^= length;
hash.v1 += hash.v2;
hash.v1 += hash.v3;
hash.v1 += hash.v4;
hash.v2 += hash.v1;
hash.v3 += hash.v1;
hash.v4 += hash.v1;
hash.v1 = fmix32(hash.v1);
hash.v2 = fmix32(hash.v2);
hash.v3 = fmix32(hash.v3);
hash.v4 = fmix32(hash.v4);
hash.v1 += hash.v2;
hash.v1 += hash.v3;
hash.v1 += hash.v4;
hash.v2 += hash.v1;
hash.v3 += hash.v1;
hash.v4 += hash.v1;
}
