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

		private byte[] A(byte[] input)
		{
			for(int j=0; j<8; j++)
			{
				a[j]=(byte)(input[j] ^ input[j+8]);
			}

			Array.Copy(input, 8, input, 0, 24);
			Array.Copy(a, 0, input, 24, 8);

			return input;
		}