Org.BouncyCastle.Crypto.Digests.MD4Digest.ProcessBlock C# (CSharp) Method

        internal override void ProcessBlock()
        {
            int a = H1;
            int b = H2;
            int c = H3;
            int d = H4;

            //
            // Round 1 - F cycle, 16 times.
            //
            a = RotateLeft((a + F(b, c, d) + X[ 0]), S11);
            d = RotateLeft((d + F(a, b, c) + X[ 1]), S12);
            c = RotateLeft((c + F(d, a, b) + X[ 2]), S13);
            b = RotateLeft((b + F(c, d, a) + X[ 3]), S14);
            a = RotateLeft((a + F(b, c, d) + X[ 4]), S11);
            d = RotateLeft((d + F(a, b, c) + X[ 5]), S12);
            c = RotateLeft((c + F(d, a, b) + X[ 6]), S13);
            b = RotateLeft((b + F(c, d, a) + X[ 7]), S14);
            a = RotateLeft((a + F(b, c, d) + X[ 8]), S11);
            d = RotateLeft((d + F(a, b, c) + X[ 9]), S12);
            c = RotateLeft((c + F(d, a, b) + X[10]), S13);
            b = RotateLeft((b + F(c, d, a) + X[11]), S14);
            a = RotateLeft((a + F(b, c, d) + X[12]), S11);
            d = RotateLeft((d + F(a, b, c) + X[13]), S12);
            c = RotateLeft((c + F(d, a, b) + X[14]), S13);
            b = RotateLeft((b + F(c, d, a) + X[15]), S14);

            //
            // Round 2 - G cycle, 16 times.
            //
            a = RotateLeft((a + G(b, c, d) + X[ 0] + 0x5a827999), S21);
            d = RotateLeft((d + G(a, b, c) + X[ 4] + 0x5a827999), S22);
            c = RotateLeft((c + G(d, a, b) + X[ 8] + 0x5a827999), S23);
            b = RotateLeft((b + G(c, d, a) + X[12] + 0x5a827999), S24);
            a = RotateLeft((a + G(b, c, d) + X[ 1] + 0x5a827999), S21);
            d = RotateLeft((d + G(a, b, c) + X[ 5] + 0x5a827999), S22);
            c = RotateLeft((c + G(d, a, b) + X[ 9] + 0x5a827999), S23);
            b = RotateLeft((b + G(c, d, a) + X[13] + 0x5a827999), S24);
            a = RotateLeft((a + G(b, c, d) + X[ 2] + 0x5a827999), S21);
            d = RotateLeft((d + G(a, b, c) + X[ 6] + 0x5a827999), S22);
            c = RotateLeft((c + G(d, a, b) + X[10] + 0x5a827999), S23);
            b = RotateLeft((b + G(c, d, a) + X[14] + 0x5a827999), S24);
            a = RotateLeft((a + G(b, c, d) + X[ 3] + 0x5a827999), S21);
            d = RotateLeft((d + G(a, b, c) + X[ 7] + 0x5a827999), S22);
            c = RotateLeft((c + G(d, a, b) + X[11] + 0x5a827999), S23);
            b = RotateLeft((b + G(c, d, a) + X[15] + 0x5a827999), S24);

            //
            // Round 3 - H cycle, 16 times.
            //
            a = RotateLeft((a + H(b, c, d) + X[ 0] + 0x6ed9eba1), S31);
            d = RotateLeft((d + H(a, b, c) + X[ 8] + 0x6ed9eba1), S32);
            c = RotateLeft((c + H(d, a, b) + X[ 4] + 0x6ed9eba1), S33);
            b = RotateLeft((b + H(c, d, a) + X[12] + 0x6ed9eba1), S34);
            a = RotateLeft((a + H(b, c, d) + X[ 2] + 0x6ed9eba1), S31);
            d = RotateLeft((d + H(a, b, c) + X[10] + 0x6ed9eba1), S32);
            c = RotateLeft((c + H(d, a, b) + X[ 6] + 0x6ed9eba1), S33);
            b = RotateLeft((b + H(c, d, a) + X[14] + 0x6ed9eba1), S34);
            a = RotateLeft((a + H(b, c, d) + X[ 1] + 0x6ed9eba1), S31);
            d = RotateLeft((d + H(a, b, c) + X[ 9] + 0x6ed9eba1), S32);
            c = RotateLeft((c + H(d, a, b) + X[ 5] + 0x6ed9eba1), S33);
            b = RotateLeft((b + H(c, d, a) + X[13] + 0x6ed9eba1), S34);
            a = RotateLeft((a + H(b, c, d) + X[ 3] + 0x6ed9eba1), S31);
            d = RotateLeft((d + H(a, b, c) + X[11] + 0x6ed9eba1), S32);
            c = RotateLeft((c + H(d, a, b) + X[ 7] + 0x6ed9eba1), S33);
            b = RotateLeft((b + H(c, d, a) + X[15] + 0x6ed9eba1), S34);

            H1 += a;
            H2 += b;
            H3 += c;
            H4 += d;

            //
            // reset the offset and clean out the word buffer.
            //
            xOff = 0;
            for (int i = 0; i != X.Length; i++)
            {
                X[i] = 0;
            }
        }
    }