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

		private void processBlock(byte[] input, int inOff)
		{
			Array.Copy(input, inOff, M, 0, 32);

			//key step 1

			// H = h3 || h2 || h1 || h0
			// S = s3 || s2 || s1 || s0
			H.CopyTo(U, 0);
			M.CopyTo(V, 0);
			for (int j=0; j<32; j++)
			{
				W[j] = (byte)(U[j]^V[j]);
			}
			// Encrypt gost28147-ECB
			E(P(W), S, 0, H, 0); // s0 = EK0 [h0]

			//keys step 2,3,4
			for (int i=1; i<4; i++)
			{
				byte[] tmpA = A(U);
				for (int j=0; j<32; j++)
				{
					U[j] = (byte)(tmpA[j] ^ C[i][j]);
				}
				V = A(A(V));
				for (int j=0; j<32; j++)
				{
					W[j] = (byte)(U[j]^V[j]);
				}
				// Encrypt gost28147-ECB
				E(P(W), S, i * 8, H, i * 8); // si = EKi [hi]
			}

			// x(M, H) = y61(H^y(M^y12(S)))
			for(int n = 0; n < 12; n++)
			{
				fw(S);
			}
			for(int n = 0; n < 32; n++)
			{
				S[n] = (byte)(S[n] ^ M[n]);
			}

			fw(S);

			for(int n = 0; n < 32; n++)
			{
				S[n] = (byte)(H[n] ^ S[n]);
			}
			for(int n = 0; n < 61; n++)
			{
				fw(S);
			}
			Array.Copy(S, 0, H, 0, H.Length);
		}