Org.BouncyCastle.Crypto.Engines.Cast5Engine.F1 C# (CSharp) Метод

        internal static uint F1(uint D, uint Kmi, int Kri)
        {
            uint I = Kmi + D;
            I = I << Kri | (I >> (32-Kri));
            return ((S1[(I>>24)&0xff]^S2[(I>>16)&0xff])-S3[(I>>8)&0xff])+S4[I&0xff];
        }

        internal override void SetKey(byte[] key)
        {
            uint num  = 1518500249u;
            uint num2 = 1859775393u;
            int  num3 = 19;
            int  num4 = 17;

            for (int i = 0; i < 24; i++)
            {
                for (int j = 0; j < 8; j++)
                {
                    _Tm[i * 8 + j] = num;
                    num           += num2;
                    _Tr[i * 8 + j] = num3;
                    num3           = (num3 + num4) & 0x1F;
                }
            }
            byte[] array = new byte[64];
            ((global::System.Array)key).CopyTo((global::System.Array)array, 0);
            for (int k = 0; k < 8; k++)
            {
                _workingKey[k] = Pack.BE_To_UInt32(array, k * 4);
            }
            for (int l = 0; l < 12; l++)
            {
                int    num5 = l * 2 * 8;
                uint[] workingKey;
                (workingKey = _workingKey)[6] = workingKey[6] ^ Cast5Engine.F1(_workingKey[7], _Tm[num5], _Tr[num5]);
                (workingKey = _workingKey)[5] = workingKey[5] ^ Cast5Engine.F2(_workingKey[6], _Tm[num5 + 1], _Tr[num5 + 1]);
                (workingKey = _workingKey)[4] = workingKey[4] ^ Cast5Engine.F3(_workingKey[5], _Tm[num5 + 2], _Tr[num5 + 2]);
                (workingKey = _workingKey)[3] = workingKey[3] ^ Cast5Engine.F1(_workingKey[4], _Tm[num5 + 3], _Tr[num5 + 3]);
                (workingKey = _workingKey)[2] = workingKey[2] ^ Cast5Engine.F2(_workingKey[3], _Tm[num5 + 4], _Tr[num5 + 4]);
                (workingKey = _workingKey)[1] = workingKey[1] ^ Cast5Engine.F3(_workingKey[2], _Tm[num5 + 5], _Tr[num5 + 5]);
                (workingKey = _workingKey)[0] = workingKey[0] ^ Cast5Engine.F1(_workingKey[1], _Tm[num5 + 6], _Tr[num5 + 6]);
                (workingKey = _workingKey)[7] = workingKey[7] ^ Cast5Engine.F2(_workingKey[0], _Tm[num5 + 7], _Tr[num5 + 7]);
                num5 = (l * 2 + 1) * 8;
                (workingKey = _workingKey)[6] = workingKey[6] ^ Cast5Engine.F1(_workingKey[7], _Tm[num5], _Tr[num5]);
                (workingKey = _workingKey)[5] = workingKey[5] ^ Cast5Engine.F2(_workingKey[6], _Tm[num5 + 1], _Tr[num5 + 1]);
                (workingKey = _workingKey)[4] = workingKey[4] ^ Cast5Engine.F3(_workingKey[5], _Tm[num5 + 2], _Tr[num5 + 2]);
                (workingKey = _workingKey)[3] = workingKey[3] ^ Cast5Engine.F1(_workingKey[4], _Tm[num5 + 3], _Tr[num5 + 3]);
                (workingKey = _workingKey)[2] = workingKey[2] ^ Cast5Engine.F2(_workingKey[3], _Tm[num5 + 4], _Tr[num5 + 4]);
                (workingKey = _workingKey)[1] = workingKey[1] ^ Cast5Engine.F3(_workingKey[2], _Tm[num5 + 5], _Tr[num5 + 5]);
                (workingKey = _workingKey)[0] = workingKey[0] ^ Cast5Engine.F1(_workingKey[1], _Tm[num5 + 6], _Tr[num5 + 6]);
                (workingKey = _workingKey)[7] = workingKey[7] ^ Cast5Engine.F2(_workingKey[0], _Tm[num5 + 7], _Tr[num5 + 7]);
                _Kr[l * 4]     = (int)(_workingKey[0] & 0x1F);
                _Kr[l * 4 + 1] = (int)(_workingKey[2] & 0x1F);
                _Kr[l * 4 + 2] = (int)(_workingKey[4] & 0x1F);
                _Kr[l * 4 + 3] = (int)(_workingKey[6] & 0x1F);
                _Km[l * 4]     = _workingKey[7];
                _Km[l * 4 + 1] = _workingKey[5];
                _Km[l * 4 + 2] = _workingKey[3];
                _Km[l * 4 + 3] = _workingKey[1];
            }
        }