des.cs

使用viginear,column permutation,DES加密和解密

using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;

namespace MyCAP
{
    class DES
    {
        private int[] pc1 = new int[]{57,49,41,33,25,17,9,1,58,50,42,34,26,18,
                                    10,2,59,51,43,35,27,19,11,3,60,52,44,36,
                                    63,55,47,39,31,23,15,7,62,54,46,38,30,22,
                                    14,6,61,53,45,37,29,21,13,5,28,20,12,4};
        private int[] pc2 = new int[]{14,17,11,24,1,5,3,28,15,6,21,10,
                                    23,19,12,4,26,8,16,7,27,20,13,2,
                                    41,52,31,37,47,55,30,40,51,45,33,48,
                                    44,49,39,56,34,53,46,42,50,36,29,32};
        private int[] shiftBox = new int[] { 1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1 };
        private int[] eBox = new int[]{ 32,1,2,3,4,5,
                                        4,5,6,7,8,9,
                                        8,9,10,11,12,13,
                                        12,13,14,15,16,17,
                                        16,17,18,19,20,21,
                                        20,21,22,23,24,25,
                                        24,25,26,27,28,29,
                                        28,29,30,31,32,1};
        private int[][,] sbox = new int[][,]{new int[,]{{14,4,13,1,2,15,11,8,3,10,6,12,5,9,0,7},
                                                        {0,15,7,4,14,2,13,1,10,6,12,11,9,5,3,8},
                                                        {4,1,14,8,13,6,2,11,15,12,9,7,3,10,5,0},
                                                        {15,12,8,2,4,9,1,7,5,11,3,14,10,0,6,13}},
                                            new int[,]{{15,1,8,14,6,11,3,4,9,7,2,13,12,0,5,10},
                                                        {3,13,4,7,15,2,8,14,12,0,1,10,6,9,11,5},
                                                        {0,14,7,11,10,4,13,1,5,8,12,6,9,3,2,5},
                                                        {13,8,10,1,3,15,4,2,11,6,7,12,0,5,14,9}},
                                            new int[,]{{10,0,9,14,6,3,15,5,1,13,12,7,11,4,2,8},
                                                        {13,7,0,9,3,4,6,10,2,8,5,14,12,11,15,1},
                                                        {13,6,4,9,8,15,3,0,11,1,2,12,5,10,14,7},
                                                        {1,10,13,0,6,9,8,7,4,15,14,3,11,5,2,12}},
                                            new int[,]{{7,13,14,3,0,6,9,10,1,2,8,5,11,12,4,15},
                                                        {13,8,11,5,6,15,0,3,4,7,2,12,1,10,14,9},
                                                        {10,6,9,0,12,11,7,13,15,1,3,14,5,2,8,4},
                                                        {3,15,0,6,10,1,13,8,9,4,5,11,12,7,2,14}},
                                            new int[,]{{2,12,4,1,7,10,11,6,8,5,3,15,13,0,14,9},
                                                        {14,11,2,12,4,7,13,1,5,0,15,10,3,9,8,6},
                                                        {4,2,1,11,10,13,7,8,15,9,12,5,6,3,0,14},
                                                        {11,8,12,7,1,14,2,13,6,15,0,9,10,4,5,3}},
                                            new int[,]{{12,1,10,15,9,2,6,8,0,13,3,4,14,7,5,11},
                                                        {10,15,4,2,7,12,9,5,6,1,13,14,0,11,3,8},
                                                        {9,14,15,5,2,8,12,3,7,0,4,10,1,13,11,6},
                                                        {4,3,2,12,9,5,15,10,11,14,1,7,6,0,8,13}},
                                            new int[,]{{4,11,2,14,15,0,8,13,3,12,9,7,5,10,6,1},
                                                        {13,0,11,7,4,9,1,10,14,3,5,12,2,15,8,6},
                                                        {1,4,11,13,12,3,7,14,10,15,6,8,0,5,9,2},
                                                        {6,11,13,8,1,4,10,7,9,5,0,15,14,2,3,12}},
                                            new int[,]{{13,2,8,4,6,15,11,1,10,9,3,14,5,0,12,7},
                                                        {1,15,13,8,10,3,7,4,12,5,6,11,0,14,9,2},
                                                        {7,11,4,1,9,12,14,2,0,6,10,13,15,3,5,8},
                                                        {2,1,14,7,4,10,8,13,15,12,9,0,3,5,6,11}}};
        private int[] pbox = new int[] { 16, 7, 20, 21,
                                        29, 12, 28, 17,
                                        1, 15, 23, 26,
                                        5, 18, 31, 10,
                                        2, 8, 24, 12,
                                        32, 27, 3, 9,
                                        19, 13, 30, 6,
                                        22, 11, 4, 25 };
        private const int LoopNum = 16;
        private const int BlockSize = 64;
        private const int PartBlockSize = 32;
        private const int eBoxSize = 48;
        private const int sBoxNum = 8;
        private const int sBoxSize = 6;
        private const int SubResult = 4;//the result length of substition

        public string GetCipherText(string plain, string key)
        {
            string cipher;
            int[] bkey, bplain;//binary key,plain;
            int[] bcipher;
            int[] temkey;//
            int[][] Dplain;//the division of  palin;
            int[][] Dblock;//the left and right part block
            int[][] loopkey = new int[LoopNum][];//to store the the key in the loop
            int LoopLevel;
            bkey = str2ints(key, key.Length);//init binary key;
            bplain = str2ints(plain, plain.Length);//init binary plain text;
            bkey = odd(bkey);//key extention
            bkey = Permutation(bkey, pc1);//pc1 box permutation
            Dplain = Division(bplain, bplain.Length / BlockSize, BlockSize);
            for (int i = 0; i < LoopNum; i++)
            {
                bkey = KeySolute(bkey, shiftBox[i]);
                loopkey[i] = Permutation(bkey, pc2);
            }
            for (LoopLevel = 0; LoopLevel < LoopNum; LoopLevel++)//the 16 level loop for encryption
            {
                temkey = loopkey[LoopLevel];
                for (int i = 0; i < Dplain.Length; i++)
                {
                    Dblock = Division(Dplain[i], Dplain[i].Length / PartBlockSize, PartBlockSize);
                    Dplain[i] = PlainSolute(Dblock, temkey);
                }
            }
            bcipher = intsAdd(Dplain, Dplain.Length);
            cipher = bints2str( bcipher);
            return cipher;

        }

        public string GetPlainText(string scipher, string key)//
        {//decryption
            int[] bkey, bplain;
            int[] cipher;
            int[] temkey;
            string plain;
            int[][] loopkey = new int[LoopNum][];//to store the the key in the loop
            int[][] Dblock;
            cipher = bstr2ints(scipher);
            bkey = str2ints(key , key.Length);
            bkey = odd(bkey);//key extention
            bkey = Permutation(bkey, pc1);//pc1 box permutation
            for (int i = 0; i < LoopNum; i++)
            {
                bkey = KeySolute(bkey, shiftBox[i]);
                loopkey[i] = Permutation(bkey, pc2);
            }
            int[][] blockc;
            blockc = Division(cipher, cipher.Length / BlockSize, BlockSize);
            for (int LoopLevel = 0; LoopLevel < LoopNum; LoopLevel++)
            {
                temkey = loopkey[LoopNum - LoopLevel - 1];
                for (int i = 0; i < blockc.Length; i++)
                {
                    Dblock = Division(blockc[i], blockc[i].Length / PartBlockSize, PartBlockSize);
                    blockc[i] = CipherSolute(Dblock, temkey);
                }
            }
            bplain = intsAdd(blockc, blockc.Length);
            plain = ints2str(bplain, bplain.Length);
            return plain;
        }

        private int[] KeySolute(int[] bkey, int LoopLevel)//bkey:binary key;LoopLevel:the loop level from 1 to 16
        {//solution of key;
            int[][] Dkey;//the division of key           
            Dkey = Division(bkey, 2, bkey.Length / 2);
            Dkey[0] = LeftShift(Dkey[0], LoopLevel);
            Dkey[1] = LeftShift(Dkey[1], LoopLevel);
            bkey = intsAdd(Dkey, Dkey.Length);
            //bkey = Permutation(bkey, pc2);
            return bkey;
        }

        private int[] CipherSolute(int[][] oints, int[] bkey)
        {
            int[][] nints = new int[oints.Length][];
            //int[] ints;
            int[] fints;//final result;
            nints[1] = oints[0];
            oints[0] = Permutation(oints[0], eBox);
            oints[0] = xor(oints[0], bkey);
            oints[0] = sBox(oints[0]);
            oints[0] = Permutation(oints[0], pbox);
            nints[0] = xor(oints[0], oints[1]);
            fints = intsAdd(nints, nints.Length);
            return fints;
        }

        private int[] PlainSolute(int[][] oints, int[] bkey)//oints:contain left and right 32 bit block;bkey:soluted 48 bit binary keys
        {//solution of plain
            int[][] nints = new int[oints.Length][];
            int[] fints;//final result;
            nints[0] = oints[1];
            oints[1] = Permutation(oints[1], eBox);
            oints[1] = xor(oints[1], bkey);
            oints[1] = sBox(oints[1]);
            oints[1] = Permutation(oints[1], pbox);
            nints[1] = xor(oints[1], oints[0]);
            fints = intsAdd(nints, nints.Length);
            return fints;
        }

        private int[] str2ints(string str, int num)
        {//convert a string to a certain form int[];
            int[] ints = new int[num * 8];
            int[] nints = ints;
            int i;