Org.BouncyCastle.Crypto.Digests.Gost3411Digest.P C# (CSharp) Method

		private byte[] P(byte[] input)
		{
			int fourK = 0;
			for(int k = 0; k < 8; k++)
			{
				K[fourK++] = input[k];
				K[fourK++] = input[8 + k];
				K[fourK++] = input[16 + k];
				K[fourK++] = input[24 + k];
			}

			return K;
		}