Blake2B-Simple.cs

/*	BLAKE2 reference source code package - C# implementation

	Written in 2012 by Samuel Neves <sneves@dei.uc.pt>
	Written in 2012 by Christian Winnerlein <codesinchaos@gmail.com>
	Written in 2016 by Uli Riehm <metadings@live.de>

	To the extent possible under law, the author(s) have dedicated all copyright
	and related and neighboring rights to this software to the public domain
	worldwide. This software is distributed without any warranty.

	You should have received a copy of the CC0 Public Domain Dedication along with
	this software. If not, see <http://creativecommons.org/publicdomain/zero/1.0/>.
*/

using System;

namespace Crypto
{
#if SIMPLE
	public partial class Blake2B
	{
		private ulong[] v = new ulong[16];

		private static ulong RotateRight(ulong value, int nBits)
		{
			return (value >> nBits) | (value << (64 - nBits));
		}

		private void G(int a, int b, int c, int d, int r, int i)
		{
			int p = (r << 4) + i;
			int p0 = Sigma[p];
			int p1 = Sigma[p + 1];

			v[a] += v[b] + material[p0];
			v[d] = RotateRight(v[d] ^ v[a], 32);
			v[c] += v[d];
			v[b] = RotateRight(v[b] ^ v[c], 24);
			v[a] += v[b] + material[p1];
			v[d] = RotateRight(v[d] ^ v[a], 16);
			v[c] += v[d];
			v[b] = RotateRight(v[b] ^ v[c], 63);
		}

		partial void Compress()
		{
			v[0] = state[0];
			v[1] = state[1];
			v[2] = state[2];
			v[3] = state[3];
			v[4] = state[4];
			v[5] = state[5];
			v[6] = state[6];
			v[7] = state[7];

			v[8] = IV0;
			v[9] = IV1;
			v[10] = IV2;
			v[11] = IV3;
			v[12] = IV4 ^ counter0;
			v[13] = IV5 ^ counter1;
			v[14] = IV6 ^ f0;
			v[15] = IV7 ^ f1;

			for (int r = 0; r < NumberOfRounds; ++r)
			{
				G(0, 4, 8, 12, r, 0);
				G(1, 5, 9, 13, r, 2);
				G(2, 6, 10, 14, r, 4);
				G(3, 7, 11, 15, r, 6);
				G(3, 4, 9, 14, r, 14);
				G(2, 7, 8, 13, r, 12);
				G(0, 5, 10, 15, r, 8);
				G(1, 6, 11, 12, r, 10);
			}

			for (int i = 0; i < 8; ++i)
				state[i] ^= v[i] ^ v[i + 8];
		}
	}
#endif
}