des算法java模拟实现

已同步github项目：

url:https://github.com/EricLi404/Java-Demos/tree/master/Des-Demo

git:https://github.com/EricLi404/Java-Demos.git

// 主类，含有一些调试信息，各种输出

package cryptology;

import java.util.Scanner;

/**
* Created by leif on 2016/3/26 0026.
*/
public class des {
public static void main(String[] args) {
System.out.println("**********************************************************");
System.out.println("                      DES加解密分步演示                      ");
System.out.println("**********************************************************");
System.out.println();
@SuppressWarnings("resource")
Scanner in = new Scanner(System.in);
System.out.print("请输入明文(支持任意长度字母数字组合)：");
String mmmmmm = in.nextLine();
System.out.print("请输入密钥(支持任意格式输入)：");
String kkkkkk = in.nextLine();
String[] M = util.all2string(mmmmmm);
char[] K = util.keypre(kkkkkk);
descore descore = new descore();
String mimi = descore.en(M, K);
String demimi = descore.de(util.all222string(mimi), K);
String demimistring = util.byte2string(demimi);
System.out.println("*************************************************");
System.out.println("**********************结果***********************");
System.out.println("明文："+mmmmmm);
System.out.println("------------------------------------------------------------");
System.out.println("加密结果：");
System.out.println("二进制："+ mimi);
System.out.println("十六进制："+util.two2hex(mimi));
System.out.println("------------------------------------------------------------");
System.out.println("解密结果：");
System.out.println("二进制："+demimi);
System.out.println("十六进制："+util.two2hex(demimi));
System.out.println("编码后："+demimistring);

}

}

// 核心算法类
package cryptology;

/**
* Created by leif on 2016/3/26 0026.
*/
public class descore {

/**
* 初始置換
* @param M char[64]
* @return char[56]
*/
private char[] initReplace(char[] M){
char[] tM = new char[64];
for (int i = 0; i < 64; i++){
tM[i] = M[data.IP[i]-1];
}
return tM;
}

/**
* 密钥置换 1
* @param K char[64]
* @return char[56]
*/
private char[] keyReplace1(char[] K){
char[] tK = new char[64];
for (int i = 0; i < 56; i++){
tK[i] = K[data.PC_1[i]-1];
}
return tK;
}

/**
* 生成子密钥
* @param K char[56]
* @param offset 左移位数 int
* @return char[56]
*/
private char[] loopKey(char[] K, int offset){
String k1 = new String();
String k2 = new String();
String k = new String(K);
k1 = (k.substring(0,28)+k.substring(0,2)).substring(offset,offset+28);
k2 = (k.substring(28,56)+k.substring(28,30)).substring(offset,offset+28);
return (k1+k2).toCharArray();
}

/**
*  密钥置换2
* @param K char[56]
* @return char[48]
*/
private char[] keyReplace2(char[] K){
char[] tK = new char[48];
for (int i = 0; i < 48; i++){
tK[i] = K[data.PC_2[i]-1];
}
return tK;
}

/**
*  生成16轮的轮密钥
* @param K char[64]
* @return
*/
private char[][] getKey(char[] K){
char[][] tK = new char[16][48];
char[][] ttK = new char[16][48];
char[] k1 = new char[56];
k1 = keyReplace1(K);
tK[0] = loopKey(k1,data.LeftMove[0]);
for (int i = 1; i < 16; i++){
tK[i] = loopKey(tK[i-1],data.LeftMove[i]);
}
for(int i = 0; i < 16; i++){
ttK[i] = keyReplace2(tK[i]);
}
return ttK;
}

/**
* E 表置换（拓展置换）
* @param R char[32]
* @return char[48]
*/
private char[] eReplace(char[] R){
char[] tR = new char[48];
for (int i = 0;i < 48; i++){
tR[i] = R[data.E[i]-1];
}
return tR;
}

/**
*  xor异或操作
* @param tR char[48]
* @param K char[48] 轮密钥
* @return
*/
private char[] xor(char[] tR, char[] K){
String x = new String();
for (int i = 0; i < tR.length; i++){
x += tR[i] ^ K[i];
}
return x.toCharArray();
}

/**
* s 盒置换
* @param xorR char[48]
* @return char[32]
*/
private char[] sReplace(char[] xorR){
char[][] tR = new char[8][6];
/*        String  nn = new String(R);
System.out.println(nn+nn.length());*/
String sr = new String();
for (int i = 0; i < 8; i++){
for (int j = 0; j < 6; j++){
tR[i][j] = xorR[i*6+j];
}
int p = util.two2ten(String.valueOf(tR[i][0])+String.valueOf(tR[i][5]));
int q = util.two2ten(String.valueOf(tR[i][1])+String.valueOf(tR[i][2])+String.valueOf(tR[i][3])+String.valueOf(tR[i][4]));
sr += String.format("%04d",Integer.parseInt(Integer.toBinaryString(data.S_Box[i][p][q])));
//            sr += String.format("%04d",Integer.parseInt(Integer.toBinaryString(data.S_Box[i][(tR[i][0] << 1) + tR[i][5]][(tR[i][1] << 3) + (tR[i][2] << 2) + (tR[i][3] << 1) + tR[i][4]])));
}
return sr.toCharArray();
}

/**
* p 表置换
* @param sR char[32]
* @return char[32]
*/
private char[] pReplace(char[] sR){
char[] pR = new char[32];
for (int i = 0; i < 32; i++){
pR[i] = sR[data.P[i]-1];
}
return pR;
}

/**
*  终结置换
* @param R char[64]
* @return char[64]
*/
private char[] init_1Replace(char[] R){
char[] tR = new char[64];
for (int i = 0; i < 64; i++){
tR[i] = R[data.IP_1[i]-1];
}
return tR;
}

/**
*  轮置换
* @param R char[32]
* @param K char[32]
* @return char[32]
*/
public char[] core(char[] R, char[] K){
char[] eR = eReplace(R);
System.out.println("Etable置换结果---"+new String(eR)+"-----"+util.two2hex(new String(eR)));
System.out.println("轮密钥---"+new String(K)+"-----"+util.two2hex(new String(K)));
char[] xorR = xor(eR,K);
System.out.println("xor-1结果---"+new String(xorR)+"-----"+util.two2hex(new String(xorR)));
char[] sR = sReplace(xorR);
System.out.println("Sbox置换结果---"+new String(sR)+"-----"+util.two2hex(new String(sR)));
char[] pR = pReplace(sR);
System.out.println("Ptable置换结果---"+new String(pR)+"-----"+util.two2hex(new String(pR)));
@SuppressWarnings("unused")
String pp = new String(pR);
return pR;
}

public String enCode(char[] M, char[] K){
System.out.println("#########################");
System.out.println(" =====  === == ==  = =   开始加密");
System.out.println("比特流为---"+new String(M)+"-----"+util.two2hex(new String(M)));
System.out.println("密钥为---"+new String(K)+"-----"+util.two2hex(new String(K)));
char[][] L = new char[17][32];
char[][] R = new char[17][32];
char[][] key = new char[16][48];
char[] res = new char[64];
char[] r = new char[64];
M = initReplace(M);
System.out.println("IP置换结果---"+new String(M)+"-----"+util.two2hex(new String(M)));
key = getKey(K);
for (int i = 0; i < 32; i++){
L[0][i] = M[i];
R[0][i] = M[i+32];
}

for (int i = 1; i < 17; i++){
System.out.println("===================第 "+i+" 轮==================");
char[] xorR = xor(L[i-1],core(R[i-1],key[i-1]));
System.out.println("xor-2结果"+new String(xorR)+"-----"+util.two2hex(new String(xorR)));
for (int j = 0; j < 32; j++){
L[i][j] = R[i-1][j];
R[i][j] = xorR[j];
}
}

for (int i = 0; i < 32; i++){
res[i] = R[16][i];
res[i+32] = L[16][i];
}
r = init_1Replace(res);
String rr = new String(r);
System.out.println("终结置换结果---"+new String(rr)+"-----"+util.two2hex(new String(rr)));
return rr;
}

public String deCode(char[] M, char[] K){
System.out.println("#########################");
System.out.println(" =====  === == ==  = =   开始解密");
System.out.println("比特流为---"+new String(M)+"-----"+util.two2hex(new String(M)));
System.out.println("密钥为---"+new String(K)+"-----"+util.two2hex(new String(K)));
char[][] L = new char[17][32];
char[][] R = new char[17][32];
char[][] key = new char[16][48];
char[] res = new char[64];
char[] r = new char[64];
M = initReplace(M);
System.out.println("IP置换结果---"+new String(M)+"-----"+util.two2hex(new String(M)));
key = getKey(K);
for (int i = 0; i < 32; i++){
L[0][i] = M[i];
R[0][i] = M[i+32];
}
for (int i = 1; i < 17; i++){
System.out.println("===================第 "+i+" 轮==================");
char[] xorR = xor(L[i-1],core(R[i-1],key[16-i]));
System.out.println("xor-2结果"+new String(xorR)+"-----"+util.two2hex(new String(xorR)));
for (int j = 0; j < 32; j++){
L[i][j] = R[i-1][j];
R[i][j] = xorR[j];
}
}
for (int i = 0; i < 32; i++){
res[i] = R[16][i];
res[i+32] = L[16][i];
}
r = init_1Replace(res);
String rr = new String(r);
return rr;
}

public String en(String[] mm, char[] kk) {
String mi = "";
for(int i = 0; i < mm.length; i++){
char[] charrr = mm[i].toCharArray();
mi += enCode(charrr, kk);
}
return mi;
}

public String de(String[] mm, char[] kk) {
String mi = "";
for(int i = 0; i < mm.length; i++){
char[] charrr = mm[i].toCharArray();
mi += deCode(charrr, kk);
}
return mi;
}
}

// des算法置换过程需要用到的一些置换表

package cryptology;

/**
* Created by leif on 2016/3/26 0026.
*/
public class data {
// 声明常量字节数组
static int length = 0;

public static int getLength() {
return length;
}
public static void setLength(int length) {
data.length = length;
}
/**
* 初始置换
*/
static final int[] IP = {
58, 50, 42, 34, 26, 18, 10, 2, 60, 52, 44, 36, 28, 20, 12, 4, 62, 54,
46, 38, 30, 22, 14, 6, 64, 56, 48, 40, 32, 24, 16, 8, 57, 49, 41, 33,
25, 17, 9, 1, 59, 51, 43, 35, 27, 19, 11, 3, 61, 53, 45, 37, 29, 21,
13, 5, 63, 55, 47, 39, 31, 23, 15, 7
}; // 64

/**
*
*/
static final int[] IP_1 = {
40, 8, 48, 16, 56, 24, 64, 32, 39, 7, 47, 15, 55, 23, 63, 31, 38, 6,
46, 14, 54, 22, 62, 30, 37, 5, 45, 13, 53, 21, 61, 29, 36, 4, 44, 12,
52, 20, 60, 28, 35, 3, 43, 11, 51, 19, 59, 27, 34, 2, 42, 10, 50, 18,
58, 26, 33, 1, 41, 9, 49, 17, 57, 25
}; // 64

/**
* 密钥置换  1
*/
static final int[] PC_1 = {
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
}; // 56

/**
*  密钥置换  2
*/
static final int[] PC_2 = {
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
}; // 48

/**
*  E表置换（将密钥的右32置换为48）
*/
static final int[] E = {
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
}; // 48

static final int[] P = {
16, 7, 20, 21, 29, 12, 28, 17, 1, 15, 23, 26, 5, 18, 31, 10, 2, 8,
24, 14, 32, 27, 3, 9, 19, 13, 30, 6, 22, 11, 4, 25
}; // 32
static final int[][][] S_Box = {
{
{ 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 }
},
{ // S_Box[1]
{ 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, 15 },
{ 13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9 }
},
{ // S_Box[2]
{ 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 }
},
{ // S_Box[3]
{ 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 }
},
{ // S_Box[4]
{ 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 }
},
{ // S_Box[5]
{ 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 }
},
{ // S_Box[6]
{ 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 }
},
{ // S_Box[7]
{ 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 }
} // S_Box[8]
};
static final int[] LeftMove = {
1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1
}; // 左移位置列表
}

// 系统里用到的一些公共的功能性函数

package cryptology;

import java.util.HashMap;

/**
* Created by leif on 2016/6/21.
*/
public class util {
/**
*  二进制转十进制
* @param two 二进制 string
* @return 十进制 int
*/
public static int two2ten(String two){
String s = two;
int x = 0;
int pow = 0;
for (int i = s.length() - 1; i >= 0; i--) {
x += Math.pow(2, pow) * (s.charAt(i) == '1' ? 1 : 0);
pow ++;
}
return x;
}

/**
*  二进制转十六进制
* @param two 二进制 string
* @return 十六进制 int
*/
public static String two2hex(String bString){
if (bString == null || bString.equals("") || bString.length() % 8 != 0)
return null;
StringBuffer tmp = new StringBuffer();
int iTmp = 0;
for (int i = 0; i < bString.length(); i += 4)
{
iTmp = 0;
for (int j = 0; j < 4; j++)
{
iTmp += Integer.parseInt(bString.substring(i + j, i + j + 1)) << (4 - j - 1);
}
tmp.append(Integer.toHexString(iTmp));
}
return tmp.toString();
}

/**
*  将64位int数组转化为64位char数组
* @param mm int[64]
* @return char[64]
*/
public static char[] int64tochar64(int[] mm){
@SuppressWarnings("unused")
char[] g = new char[64];
String gg = new String();
for (int i = 0; i < 64; i++){
gg += mm[i];
}
return gg.toCharArray();
}

public static HashMap<Integer,char[]> preMI(String mmmmmm){
String lmmmmmm = "";
for(int i = 0; i < mmmmmm.length(); i++){
lmmmmmm += Integer.toBinaryString(Integer.parseInt(mmmmmm.substring(i,i+1)));
}
HashMap<Integer, char[] > tmmm = new HashMap<>();
char mmmmm[] = lmmmmmm.toCharArray();
char rm[] = new char[64];
int j = 0;
for(int i = 0; i < lmmmmmm.length(); i++){
rm[i%64] = mmmmm[i];
if (i % 64 == 63) {
tmmm.put(j, rm);
j++;
}
}
return tmmm;
}

/**
* 明文初始化处理，将每一位转为一个64bit长度的string
* @param all
* @return
*/
public static String[] all2string(String all)  {
byte byteall[] = all.getBytes();
String allstring[] = new String[all.length()];
for(int i = 0; i < byteall.length; i++){
allstring[i] =   String.format("%064d", Integer.parseInt(Integer.toBinaryString(byteall[i])));
}
return allstring;
}

/**
* 密文解密预处理，将密文每64bit截取成一个string
* @param all
* @return
*/
public static String[] all222string(String all)  {
String allstring[] = new String[all.length()/64];
for(int i = 0; i < allstring.length; i++){
allstring[i] =   all.substring(i*64,(i+1)*64);
}
return allstring;
}

/**
* 将解密结果的byte转为string，还原密文
* @param all
* @return
*/
public static String byte2string(String all)  {
byte allstring[] = new byte[all.length()/64];
for(int i = 0; i < allstring.length; i++){
allstring[i] =   (byte) two2ten(all.substring(i*64,(i+1)*64).substring(56, 64));
}
return new String(allstring);
}

/**
* 将任意格式的密钥获取hash值，格式化为char[64]
* @param k
* @return
*/
public static char[] keypre(String k) {
String ha = String.format("%08d", k.hashCode());
String kk = "";
for(int i = 0; i < 8; i++){
kk += String.format("%08d", Integer.parseInt(Integer.toBinaryString(Integer.parseInt(ha.substring(i, i+1)))));
}
return kk.toCharArray();
}
}