des算法java模拟实现
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大二下学期应用密码学课程设计
已同步github项目：
url:https://github.com/leiflee/desdemo
git:https://github.com/leiflee/desdemo.git
实现了des算法，具体的每一步的输出都有记录，没有加入工作模式，支持加密的输入为英文和数字混合的字符串，填充方式采用的无限填充0的做法。下面是源码。
// 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(); }} 1 0
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