最近新的系统开发用的是Cookie存储用户信息，使用des加密
工具类如下所示:
/** * Copyright (c) 2013-Now http://jeesite.com All rights reserved. */ package com.lms.common.utils; import java.io.UnsupportedEncodingException; import java.util.ArrayList; import java.util.List; /** * DES加密解密工具 * 加密：DesUtils.encode("admin","1,2,3"); * 解密：DesUtils.decode("012C2C9BA925FAF8045B2FD9B02A2664","1,2,3"); * @author ThinkGem */ public class DesUtils { private static DesCore desCore = new DesCore(); /** * DES加密（secretKey代表3个key，用逗号分隔） */ public static String encode(String data, String secretKey) { if (StringUtils.isBlank(data)){ return ""; } String[] ks = StringUtils.split(secretKey, ","); if (ks.length >= 3){ return desCore.strEnc(data, ks[0], ks[1], ks[2]); } return desCore.strEnc(data, secretKey, "", ""); } /** * DES解密（secretKey代表3个key，用逗号分隔） */ public static String decode(String data, String secretKey) { if (StringUtils.isBlank(data)){ return ""; } String[] ks = StringUtils.split(secretKey, ","); if (ks.length >= 3){ return desCore.strDec(data, ks[0], ks[1], ks[2]); } return desCore.strDec(data, secretKey, "", ""); } /** * DES加密/解密 * @Copyright Copyright (c) 2006 * @author Guapo */ @SuppressWarnings({"rawtypes","unused","unchecked"}) static class DesCore { /* * encrypt the string to string made up of hex return the encrypted string */ public String strEnc(String data, String firstKey, String secondKey, String thirdKey) { int leng = data.length(); String encData = ""; List firstKeyBt = null, secondKeyBt = null, thirdKeyBt = null; int firstLength = 0, secondLength = 0, thirdLength = 0; if (firstKey != null && firstKey != "") { firstKeyBt = getKeyBytes(firstKey); firstLength = firstKeyBt.size(); } if (secondKey != null && secondKey != "") { secondKeyBt = getKeyBytes(secondKey); secondLength = secondKeyBt.size(); } if (thirdKey != null && thirdKey != "") { thirdKeyBt = getKeyBytes(thirdKey); thirdLength = thirdKeyBt.size(); } if (leng > 0) { if (leng < 4) { int[] bt = strToBt(data); int[] encByte = null; if (firstKey != null && firstKey != "" && secondKey != null && secondKey != "" && thirdKey != null && thirdKey != "") { int[] tempBt; int x, y, z; tempBt = bt; for (x = 0; x < firstLength; x++) { tempBt = enc(tempBt, (int[]) firstKeyBt.get(x)); } for (y = 0; y < secondLength; y++) { tempBt = enc(tempBt, (int[]) secondKeyBt.get(y)); } for (z = 0; z < thirdLength; z++) { tempBt = enc(tempBt, (int[]) thirdKeyBt.get(z)); } encByte = tempBt; } else { if (firstKey != null && firstKey != "" && secondKey != null && secondKey != "") { int[] tempBt; int x, y; tempBt = bt; for (x = 0; x < firstLength; x++) { tempBt = enc(tempBt, (int[]) firstKeyBt.get(x)); } for (y = 0; y < secondLength; y++) { tempBt = enc(tempBt, (int[]) secondKeyBt.get(y)); } encByte = tempBt; } else { if (firstKey != null && firstKey != "") { int[] tempBt; int x = 0; tempBt = bt; for (x = 0; x < firstLength; x++) { tempBt = enc(tempBt, (int[]) firstKeyBt.get(x)); } encByte = tempBt; } } } encData = bt64ToHex(encByte); } else { int iterator = (leng / 4); int remainder = leng % 4; int i = 0; for (i = 0; i < iterator; i++) { String tempData = data.substring(i * 4 + 0, i * 4 + 4); int[] tempByte = strToBt(tempData); int[] encByte = null; if (firstKey != null && firstKey != "" && secondKey != null && secondKey != "" && thirdKey != null && thirdKey != "") { int[] tempBt; int x, y, z; tempBt = tempByte; for (x = 0; x < firstLength; x++) { tempBt = enc(tempBt, (int[]) firstKeyBt.get(x)); } for (y = 0; y < secondLength; y++) { tempBt = enc(tempBt, (int[]) secondKeyBt.get(y)); } for (z = 0; z < thirdLength; z++) { tempBt = enc(tempBt, (int[]) thirdKeyBt.get(z)); } encByte = tempBt; } else { if (firstKey != null && firstKey != "" && secondKey != null && secondKey != "") { int[] tempBt; int x, y; tempBt = tempByte; for (x = 0; x < firstLength; x++) { tempBt = enc(tempBt, (int[]) firstKeyBt.get(x)); } for (y = 0; y < secondLength; y++) { tempBt = enc(tempBt, (int[]) secondKeyBt.get(y)); } encByte = tempBt; } else { if (firstKey != null && firstKey != "") { int[] tempBt; int x; tempBt = tempByte; for (x = 0; x < firstLength; x++) { tempBt = enc(tempBt, (int[]) firstKeyBt.get(x)); } encByte = tempBt; } } } encData += bt64ToHex(encByte); } if (remainder > 0) { String remainderData = data.substring(iterator * 4 + 0, leng); int[] tempByte = strToBt(remainderData); int[] encByte = null; if (firstKey != null && firstKey != "" && secondKey != null && secondKey != "" && thirdKey != null && thirdKey != "") { int[] tempBt; int x, y, z; tempBt = tempByte; for (x = 0; x < firstLength; x++) { tempBt = enc(tempBt, (int[]) firstKeyBt.get(x)); } for (y = 0; y < secondLength; y++) { tempBt = enc(tempBt, (int[]) secondKeyBt.get(y)); } for (z = 0; z < thirdLength; z++) { tempBt = enc(tempBt, (int[]) thirdKeyBt.get(z)); } encByte = tempBt; } else { if (firstKey != null && firstKey != "" && secondKey != null && secondKey != "") { int[] tempBt; int x, y; tempBt = tempByte; for (x = 0; x < firstLength; x++) { tempBt = enc(tempBt, (int[]) firstKeyBt.get(x)); } for (y = 0; y < secondLength; y++) { tempBt = enc(tempBt, (int[]) secondKeyBt.get(y)); } encByte = tempBt; } else { if (firstKey != null && firstKey != "") { int[] tempBt; int x; tempBt = tempByte; for (x = 0; x < firstLength; x++) { tempBt = enc(tempBt, (int[]) firstKeyBt.get(x)); } encByte = tempBt; } } } encData += bt64ToHex(encByte); } } } return encData; } /* * decrypt the encrypted string to the original string * * return the original string */ public String strDec(String data, String firstKey, String secondKey, String thirdKey) { int leng = data.length(); String decStr = ""; List firstKeyBt = null, secondKeyBt = null, thirdKeyBt = null; int firstLength = 0, secondLength = 0, thirdLength = 0; if (firstKey != null && firstKey != "") { firstKeyBt = getKeyBytes(firstKey); firstLength = firstKeyBt.size(); } if (secondKey != null && secondKey != "") { secondKeyBt = getKeyBytes(secondKey); secondLength = secondKeyBt.size(); } if (thirdKey != null && thirdKey != "") { thirdKeyBt = getKeyBytes(thirdKey); thirdLength = thirdKeyBt.size(); } int iterator = leng / 16; int i = 0; for (i = 0; i < iterator; i++) { String tempData = data.substring(i * 16 + 0, i * 16 + 16); String strByte = hexToBt64(tempData); int[] intByte = new int[64]; int j = 0; for (j = 0; j < 64; j++) { intByte[j] = Integer.parseInt(strByte.substring(j, j + 1)); } int[] decByte = null; if (firstKey != null && firstKey != "" && secondKey != null && secondKey != "" && thirdKey != null && thirdKey != "") { int[] tempBt; int x, y, z; tempBt = intByte; for (x = thirdLength - 1; x >= 0; x--) { tempBt = dec(tempBt, (int[]) thirdKeyBt.get(x)); } for (y = secondLength - 1; y >= 0; y--) { tempBt = dec(tempBt, (int[]) secondKeyBt.get(y)); } for (z = firstLength - 1; z >= 0; z--) { tempBt = dec(tempBt, (int[]) firstKeyBt.get(z)); } decByte = tempBt; } else { if (firstKey != null && firstKey != "" && secondKey != null && secondKey != "") { int[] tempBt; int x, y, z; tempBt = intByte; for (x = secondLength - 1; x >= 0; x--) { tempBt = dec(tempBt, (int[]) secondKeyBt.get(x)); } for (y = firstLength - 1; y >= 0; y--) { tempBt = dec(tempBt, (int[]) firstKeyBt.get(y)); } decByte = tempBt; } else { if (firstKey != null && firstKey != "") { int[] tempBt; int x, y, z; tempBt = intByte; for (x = firstLength - 1; x >= 0; x--) { tempBt = dec(tempBt, (int[]) firstKeyBt.get(x)); } decByte = tempBt; } } } decStr += byteToString(decByte); } return decStr; } /* * chang the string into the bit array * * return bit array(it's length % 64 = 0) */ public List getKeyBytes(String key) { List keyBytes = new ArrayList(); int leng = key.length(); int iterator = (leng / 4); int remainder = leng % 4; int i = 0; for (i = 0; i < iterator; i++) { keyBytes.add(i, strToBt(key.substring(i * 4 + 0, i * 4 + 4))); } if (remainder > 0) { // keyBytes[i] = strToBt(key.substring(i*4+0,leng)); keyBytes.add(i, strToBt(key.substring(i * 4 + 0, leng))); } return keyBytes; } /* * chang the string(it's length <= 4) into the bit array * * return bit array(it's length = 64) */ public int[] strToBt(String str) { int leng = str.length(); int[] bt = new int[64]; if (leng < 4) { int i = 0, j = 0, p = 0, q = 0; for (i = 0; i < leng; i++) { int k = str.charAt(i); for (j = 0; j < 16; j++) { int pow = 1, m = 0; for (m = 15; m > j; m--) { pow *= 2; } // bt.set(16*i+j,""+(k/pow)%2)); bt[16 * i + j] = (k / pow) % 2; } } for (p = leng; p < 4; p++) { int k = 0; for (q = 0; q < 16; q++) { int pow = 1, m = 0; for (m = 15; m > q; m--) { pow *= 2; } // bt[16*p+q]=parseInt(k/pow)%2; // bt.add(16*p+q,""+((k/pow)%2)); bt[16 * p + q] = (k / pow) % 2; } } } else { for (int i = 0; i < 4; i++) { int k = str.charAt(i); for (int j = 0; j < 16; j++) { int pow = 1; for (int m = 15; m > j; m--) { pow *= 2; } // bt[16*i+j]=parseInt(k/pow)%2; // bt.add(16*i+j,""+((k/pow)%2)); bt[16 * i + j] = (k / pow) % 2; } } } return bt; } /* * chang the bit(it's length = 4) into the hex * * return hex */ public String bt4ToHex(String binary) { String hex = ""; if (binary.equalsIgnoreCase("0000")) { hex = "0"; } else if (binary.equalsIgnoreCase("0001")) { hex = "1"; } else if (binary.equalsIgnoreCase("0010")) { hex = "2"; } else if (binary.equalsIgnoreCase("0011")) { hex = "3"; } else if (binary.equalsIgnoreCase("0100")) { hex = "4"; } else if (binary.equalsIgnoreCase("0101")) { hex = "5"; } else if (binary.equalsIgnoreCase("0110")) { hex = "6"; } else if (binary.equalsIgnoreCase("0111")) { hex = "7"; } else if (binary.equalsIgnoreCase("1000")) { hex = "8"; } else if (binary.equalsIgnoreCase("1001")) { hex = "9"; } else if (binary.equalsIgnoreCase("1010")) { hex = "A"; } else if (binary.equalsIgnoreCase("1011")) { hex = "B"; } else if (binary.equalsIgnoreCase("1100")) { hex = "C"; } else if (binary.equalsIgnoreCase("1101")) { hex = "D"; } else if (binary.equalsIgnoreCase("1110")) { hex = "E"; } else if (binary.equalsIgnoreCase("1111")) { hex = "F"; } return hex; } /* * chang the hex into the bit(it's length = 4) * * return the bit(it's length = 4) */ public String hexToBt4(String hex) { String binary = ""; if (hex.equalsIgnoreCase("0")) { binary = "0000"; } else if (hex.equalsIgnoreCase("1")) { binary = "0001"; } if (hex.equalsIgnoreCase("2")) { binary = "0010"; } if (hex.equalsIgnoreCase("3")) { binary = "0011"; } if (hex.equalsIgnoreCase("4")) { binary = "0100"; } if (hex.equalsIgnoreCase("5")) { binary = "0101"; } if (hex.equalsIgnoreCase("6")) { binary = "0110"; } if (hex.equalsIgnoreCase("7")) { binary = "0111"; } if (hex.equalsIgnoreCase("8")) { binary = "1000"; } if (hex.equalsIgnoreCase("9")) { binary = "1001"; } if (hex.equalsIgnoreCase("A")) { binary = "1010"; } if (hex.equalsIgnoreCase("B")) { binary = "1011"; } if (hex.equalsIgnoreCase("C")) { binary = "1100"; } if (hex.equalsIgnoreCase("D")) { binary = "1101"; } if (hex.equalsIgnoreCase("E")) { binary = "1110"; } if (hex.equalsIgnoreCase("F")) { binary = "1111"; } return binary; } /* * chang the bit(it's length = 64) into the string * * return string */ public String byteToString(int[] byteData) { String str = ""; for (int i = 0; i < 4; i++) { int count = 0; for (int j = 0; j < 16; j++) { int pow = 1; for (int m = 15; m > j; m--) { pow *= 2; } count += byteData[16 * i + j] * pow; } if (count != 0) { str += "" + (char) (count); } } return str; } public String bt64ToHex(int[] byteData) { String hex = ""; for (int i = 0; i < 16; i++) { String bt = ""; for (int j = 0; j < 4; j++) { bt += byteData[i * 4 + j]; } hex += bt4ToHex(bt); } return hex; } public String hexToBt64(String hex) { String binary = ""; for (int i = 0; i < 16; i++) { binary += hexToBt4(hex.substring(i, i + 1)); } return binary; } /* * the 64 bit des core arithmetic */ public int[] enc(int[] dataByte, int[] keyByte) { int[][] keys = generateKeys(keyByte); int[] ipByte = initPermute(dataByte); int[] ipLeft = new int[32]; int[] ipRight = new int[32]; int[] tempLeft = new int[32]; int i = 0, j = 0, k = 0, m = 0, n = 0; for (k = 0; k < 32; k++) { ipLeft[k] = ipByte[k]; ipRight[k] = ipByte[32 + k]; } for (i = 0; i < 16; i++) { for (j = 0; j < 32; j++) { tempLeft[j] = ipLeft[j]; ipLeft[j] = ipRight[j]; } int[] key = new int[48]; for (m = 0; m < 48; m++) { key[m] = keys[i][m]; } int[] tempRight = xor(pPermute(sBoxPermute(xor(expandPermute(ipRight), key))), tempLeft); for (n = 0; n < 32; n++) { ipRight[n] = tempRight[n]; } } int[] finalData = new int[64]; for (i = 0; i < 32; i++) { finalData[i] = ipRight[i]; finalData[32 + i] = ipLeft[i]; } return finallyPermute(finalData); } public int[] dec(int[] dataByte, int[] keyByte) { int[][] keys = generateKeys(keyByte); int[] ipByte = initPermute(dataByte); int[] ipLeft = new int[32]; int[] ipRight = new int[32]; int[] tempLeft = new int[32]; int i = 0, j = 0, k = 0, m = 0, n = 0; for (k = 0; k < 32; k++) { ipLeft[k] = ipByte[k]; ipRight[k] = ipByte[32 + k]; } for (i = 15; i >= 0; i--) { for (j = 0; j < 32; j++) { tempLeft[j] = ipLeft[j]; ipLeft[j] = ipRight[j]; } int[] key = new int[48]; for (m = 0; m < 48; m++) { key[m] = keys[i][m]; } int[] tempRight = xor(pPermute(sBoxPermute(xor(expandPermute(ipRight), key))), tempLeft); for (n = 0; n < 32; n++) { ipRight[n] = tempRight[n]; } } int[] finalData = new int[64]; for (i = 0; i < 32; i++) { finalData[i] = ipRight[i]; finalData[32 + i] = ipLeft[i]; } return finallyPermute(finalData); } public int[] initPermute(int[] originalData) { int[] ipByte = new int[64]; int i = 0, m = 1, n = 0, j, k; for (i = 0, m = 1, n = 0; i < 4; i++, m += 2, n += 2) { for (j = 7, k = 0; j >= 0; j--, k++) { ipByte[i * 8 + k] = originalData[j * 8 + m]; ipByte[i * 8 + k + 32] = originalData[j * 8 + n]; } } return ipByte; } public int[] expandPermute(int[] rightData) { int[] epByte = new int[48]; int i, j; for (i = 0; i < 8; i++) { if (i == 0) { epByte[i * 6 + 0] = rightData[31]; } else { epByte[i * 6 + 0] = rightData[i * 4 - 1]; } epByte[i * 6 + 1] = rightData[i * 4 + 0]; epByte[i * 6 + 2] = rightData[i * 4 + 1]; epByte[i * 6 + 3] = rightData[i * 4 + 2]; epByte[i * 6 + 4] = rightData[i * 4 + 3]; if (i == 7) { epByte[i * 6 + 5] = rightData[0]; } else { epByte[i * 6 + 5] = rightData[i * 4 + 4]; } } return epByte; } public int[] xor(int[] byteOne, int[] byteTwo) { // var xorByte = new Array(byteOne.length); // for(int i = 0;i < byteOne.length; i ++){ // xorByte[i] = byteOne[i] ^ byteTwo[i]; // } // return xorByte; int[] xorByte = new int[byteOne.length]; for (int i = 0; i < byteOne.length; i++) { xorByte[i] = byteOne[i] ^ byteTwo[i]; } return xorByte; } public int[] sBoxPermute(int[] expandByte) { // var sBoxByte = new Array(32); int[] sBoxByte = new int[32]; String binary = ""; int[][] s1 = { { 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 } }; /* Table - s2 */ int[][] s2 = { { 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 } }; /* Table - s3 */ int[][] s3 = { { 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 } }; /* Table - s4 */ int[][] s4 = { { 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 } }; /* Table - s5 */ int[][] s5 = { { 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 } }; /* Table - s6 */ int[][] s6 = { { 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 } }; /* Table - s7 */ int[][] s7 = { { 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 } }; /* Table - s8 */ int[][] s8 = { { 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 } }; for (int m = 0; m < 8; m++) { int i = 0, j = 0; i = expandByte[m * 6 + 0] * 2 + expandByte[m * 6 + 5]; j = expandByte[m * 6 + 1] * 2 * 2 * 2 + expandByte[m * 6 + 2] * 2 * 2 + expandByte[m * 6 + 3] * 2 + expandByte[m * 6 + 4]; switch (m) { case 0: binary = getBoxBinary(s1[i][j]); break; case 1: binary = getBoxBinary(s2[i][j]); break; case 2: binary = getBoxBinary(s3[i][j]); break; case 3: binary = getBoxBinary(s4[i][j]); break; case 4: binary = getBoxBinary(s5[i][j]); break; case 5: binary = getBoxBinary(s6[i][j]); break; case 6: binary = getBoxBinary(s7[i][j]); break; case 7: binary = getBoxBinary(s8[i][j]); break; } sBoxByte[m * 4 + 0] = Integer.parseInt(binary.substring(0, 1)); sBoxByte[m * 4 + 1] = Integer.parseInt(binary.substring(1, 2)); sBoxByte[m * 4 + 2] = Integer.parseInt(binary.substring(2, 3)); sBoxByte[m * 4 + 3] = Integer.parseInt(binary.substring(3, 4)); } return sBoxByte; } public int[] pPermute(int[] sBoxByte) { int[] pBoxPermute = new int[32]; pBoxPermute[0] = sBoxByte[15]; pBoxPermute[1] = sBoxByte[6]; pBoxPermute[2] = sBoxByte[19]; pBoxPermute[3] = sBoxByte[20]; pBoxPermute[4] = sBoxByte[28]; pBoxPermute[5] = sBoxByte[11]; pBoxPermute[6] = sBoxByte[27]; pBoxPermute[7] = sBoxByte[16]; pBoxPermute[8] = sBoxByte[0]; pBoxPermute[9] = sBoxByte[14]; pBoxPermute[10] = sBoxByte[22]; pBoxPermute[11] = sBoxByte[25]; pBoxPermute[12] = sBoxByte[4]; pBoxPermute[13] = sBoxByte[17]; pBoxPermute[14] = sBoxByte[30]; pBoxPermute[15] = sBoxByte[9]; pBoxPermute[16] = sBoxByte[1]; pBoxPermute[17] = sBoxByte[7]; pBoxPermute[18] = sBoxByte[23]; pBoxPermute[19] = sBoxByte[13]; pBoxPermute[20] = sBoxByte[31]; pBoxPermute[21] = sBoxByte[26]; pBoxPermute[22] = sBoxByte[2]; pBoxPermute[23] = sBoxByte[8]; pBoxPermute[24] = sBoxByte[18]; pBoxPermute[25] = sBoxByte[12]; pBoxPermute[26] = sBoxByte[29]; pBoxPermute[27] = sBoxByte[5]; pBoxPermute[28] = sBoxByte[21]; pBoxPermute[29] = sBoxByte[10]; pBoxPermute[30] = sBoxByte[3]; pBoxPermute[31] = sBoxByte[24]; return pBoxPermute; } public int[] finallyPermute(int[] endByte) { int[] fpByte = new int[64]; fpByte[0] = endByte[39]; fpByte[1] = endByte[7]; fpByte[2] = endByte[47]; fpByte[3] = endByte[15]; fpByte[4] = endByte[55]; fpByte[5] = endByte[23]; fpByte[6] = endByte[63]; fpByte[7] = endByte[31]; fpByte[8] = endByte[38]; fpByte[9] = endByte[6]; fpByte[10] = endByte[46]; fpByte[11] = endByte[14]; fpByte[12] = endByte[54]; fpByte[13] = endByte[22]; fpByte[14] = endByte[62]; fpByte[15] = endByte[30]; fpByte[16] = endByte[37]; fpByte[17] = endByte[5]; fpByte[18] = endByte[45]; fpByte[19] = endByte[13]; fpByte[20] = endByte[53]; fpByte[21] = endByte[21]; fpByte[22] = endByte[61]; fpByte[23] = endByte[29]; fpByte[24] = endByte[36]; fpByte[25] = endByte[4]; fpByte[26] = endByte[44]; fpByte[27] = endByte[12]; fpByte[28] = endByte[52]; fpByte[29] = endByte[20]; fpByte[30] = endByte[60]; fpByte[31] = endByte[28]; fpByte[32] = endByte[35]; fpByte[33] = endByte[3]; fpByte[34] = endByte[43]; fpByte[35] = endByte[11]; fpByte[36] = endByte[51]; fpByte[37] = endByte[19]; fpByte[38] = endByte[59]; fpByte[39] = endByte[27]; fpByte[40] = endByte[34]; fpByte[41] = endByte[2]; fpByte[42] = endByte[42]; fpByte[43] = endByte[10]; fpByte[44] = endByte[50]; fpByte[45] = endByte[18]; fpByte[46] = endByte[58]; fpByte[47] = endByte[26]; fpByte[48] = endByte[33]; fpByte[49] = endByte[1]; fpByte[50] = endByte[41]; fpByte[51] = endByte[9]; fpByte[52] = endByte[49]; fpByte[53] = endByte[17]; fpByte[54] = endByte[57]; fpByte[55] = endByte[25]; fpByte[56] = endByte[32]; fpByte[57] = endByte[0]; fpByte[58] = endByte[40]; fpByte[59] = endByte[8]; fpByte[60] = endByte[48]; fpByte[61] = endByte[16]; fpByte[62] = endByte[56]; fpByte[63] = endByte[24]; return fpByte; } public String getBoxBinary(int i) { String binary = ""; switch (i) { case 0: binary = "0000"; break; case 1: binary = "0001"; break; case 2: binary = "0010"; break; case 3: binary = "0011"; break; case 4: binary = "0100"; break; case 5: binary = "0101"; break; case 6: binary = "0110"; break; case 7: binary = "0111"; break; case 8: binary = "1000"; break; case 9: binary = "1001"; break; case 10: binary = "1010"; break; case 11: binary = "1011"; break; case 12: binary = "1100"; break; case 13: binary = "1101"; break; case 14: binary = "1110"; break; case 15: binary = "1111"; break; } return binary; } /* * generate 16 keys for xor */ public int[][] generateKeys(int[] keyByte) { int[] key = new int[56]; int[][] keys = new int[16][48]; // keys[ 0] = new Array(); // keys[ 1] = new Array(); // keys[ 2] = new Array(); // keys[ 3] = new Array(); // keys[ 4] = new Array(); // keys[ 5] = new Array(); // keys[ 6] = new Array(); // keys[ 7] = new Array(); // keys[ 8] = new Array(); // keys[ 9] = new Array(); // keys[10] = new Array(); // keys[11] = new Array(); // keys[12] = new Array(); // keys[13] = new Array(); // keys[14] = new Array(); // keys[15] = new Array(); int[] loop = new int[] { 1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1 }; for (int i = 0; i < 7; i++) { for (int j = 0, k = 7; j < 8; j++, k--) { key[i * 8 + j] = keyByte[8 * k + i]; } } int i = 0; for (i = 0; i < 16; i++) { int tempLeft = 0; int tempRight = 0; for (int j = 0; j < loop[i]; j++) { tempLeft = key[0]; tempRight = key[28]; for (int k = 0; k < 27; k++) { key[k] = key[k + 1]; key[28 + k] = key[29 + k]; } key[27] = tempLeft; key[55] = tempRight; } // var tempKey = new Array(48); int[] tempKey = new int[48]; tempKey[0] = key[13]; tempKey[1] = key[16]; tempKey[2] = key[10]; tempKey[3] = key[23]; tempKey[4] = key[0]; tempKey[5] = key[4]; tempKey[6] = key[2]; tempKey[7] = key[27]; tempKey[8] = key[14]; tempKey[9] = key[5]; tempKey[10] = key[20]; tempKey[11] = key[9]; tempKey[12] = key[22]; tempKey[13] = key[18]; tempKey[14] = key[11]; tempKey[15] = key[3]; tempKey[16] = key[25]; tempKey[17] = key[7]; tempKey[18] = key[15]; tempKey[19] = key[6]; tempKey[20] = key[26]; tempKey[21] = key[19]; tempKey[22] = key[12]; tempKey[23] = key[1]; tempKey[24] = key[40]; tempKey[25] = key[51]; tempKey[26] = key[30]; tempKey[27] = key[36]; tempKey[28] = key[46]; tempKey[29] = key[54]; tempKey[30] = key[29]; tempKey[31] = key[39]; tempKey[32] = key[50]; tempKey[33] = key[44]; tempKey[34] = key[32]; tempKey[35] = key[47]; tempKey[36] = key[43]; tempKey[37] = key[48]; tempKey[38] = key[38]; tempKey[39] = key[55]; tempKey[40] = key[33]; tempKey[41] = key[52]; tempKey[42] = key[45]; tempKey[43] = key[41]; tempKey[44] = key[49]; tempKey[45] = key[35]; tempKey[46] = key[28]; tempKey[47] = key[31]; int m; switch (i) { case 0: for (m = 0; m < 48; m++) { keys[0][m] = tempKey[m]; } break; case 1: for (m = 0; m < 48; m++) { keys[1][m] = tempKey[m]; } break; case 2: for (m = 0; m < 48; m++) { keys[2][m] = tempKey[m]; } break; case 3: for (m = 0; m < 48; m++) { keys[3][m] = tempKey[m]; } break; case 4: for (m = 0; m < 48; m++) { keys[4][m] = tempKey[m]; } break; case 5: for (m = 0; m < 48; m++) { keys[5][m] = tempKey[m]; } break; case 6: for (m = 0; m < 48; m++) { keys[6][m] = tempKey[m]; } break; case 7: for (m = 0; m < 48; m++) { keys[7][m] = tempKey[m]; } break; case 8: for (m = 0; m < 48; m++) { keys[8][m] = tempKey[m]; } break; case 9: for (m = 0; m < 48; m++) { keys[9][m] = tempKey[m]; } break; case 10: for (m = 0; m < 48; m++) { keys[10][m] = tempKey[m]; } break; case 11: for (m = 0; m < 48; m++) { keys[11][m] = tempKey[m]; } break; case 12: for (m = 0; m < 48; m++) { keys[12][m] = tempKey[m]; } break; case 13: for (m = 0; m < 48; m++) { keys[13][m] = tempKey[m]; } break; case 14: for (m = 0; m < 48; m++) { keys[14][m] = tempKey[m]; } break; case 15: for (m = 0; m < 48; m++) { keys[15][m] = tempKey[m]; } break; } } return keys; } } }
把信息存储到浏览器中还是加密的要好，虽然现在有不少在线解密工具，但是还是推荐加密
下面进入正题，如何清除Cookie？
在谈谈这个问题前，我们是如何使用js获取Cookie呢？
function getMyCookie(name){ var arr,reg=new RegExp("(^| )"+name+"=([^;]*)(;|$)"); if(arr=document.cookie.match(reg)) return unescape(arr[2]); else return null; } <!-- 例如cookie的名字叫name 可通过getMyCookie("name")获得Cookie-->
Cookie通常是加密的，假如存储的Cookie是一个字符串，如何将其解密呢？
比如我使用的是DES加密和解密，我通过ajax获取它并将其解析出来？
代码如下:
js代码:
//自动加载获取Cookie
function autoLoad(){
var str ="获取Cookie";
$.ajax({
url:"getCookie",
type:"POST",
data : {"str":str},
dataType : 'json',
success:function(data){
var json = eval("("+data+")");
if(json.returnCode=="200"){
$("#userId").val(json.userId);
}else if(json.returnCode=="500"){
window.location.href='view/Login.html';
}else{
alert("有问题，请联系管理员");
}
},error:function(){
alert("失败");
}
});
}
Java代码:
/**
* 获取Cookie信息
* @param str
* @param request
* @return
*/
@RequestMapping(value="/getCookie",method=RequestMethod.POST,produces="application/json;charset=utf-8")
@ResponseBody
public String getCookie(String str,HttpServletRequest request) {
logger.info("获取Cookie信息");
logger.info("str:"+str);
Map<String,Object> map = new HashMap<String,Object>();
//获取Cookie
String cookie = CookieUtils.getCookie(request, "userId");
if(cookie!=""||cookie!=null) {
logger.info("Cookie:"+cookie);
//将Cookie解密
String userId = DesUtils.decode(cookie, "userId");
//打印Cookie解密
logger.info("userId:"+userId);
map.put("userId", userId);
map.put("returnMsg", "可获取Cookie");
map.put("returnCode", "200");
}else {
map.put("returnMsg", "不能获取Cookie");
map.put("returnCode", "500");
}
return JSON.toJSONString(map);
}
如何清除Cookie?
代码如下所示:
我的存储用户信息是用Cookie，自然注销功能也是用清除Cookie的做法
/**
* 退出功能
*/
function getMyCookie(name){
var arr,reg=new RegExp("(^| )"+name+"=([^;]*)(;|$)");
if(arr=document.cookie.match(reg))
return unescape(arr[2]);
else
return null;
}
function delCookie(name){
var exp = new Date();
exp.setTime(exp.getTime() - 1);
var cval=getMyCookie(name);
if(cval!=null)
document.cookie= name + "="+cval+";expires="+exp.toGMTString()+";path=/";
}
//退出功能
$(function(){
$("#exit").click(function(){
delCookie("userId");
location.href="http://localhost:8080/blog-web/";
});
});
首先Cookie有如下优缺点:
优点:
(1)可配置到期规则 Cookie 可以在浏览器会话结束时到期，或者可以在客户端计算机上无限期存在，这取决于客户端的到期规则。
(2)不需要任何服务器资源 Cookie 存储在客户端并在发送后由服务器读取。
(3)简单性 Cookie 是一种基于文本的轻量结构，包含简单的键值对。
(4)数据持久性 虽然客户端计算机上 Cookie 的持续时间取决于客户端上的 Cookie 过期处理和用户干预，Cookie 通常是客户端上持续时间最长的数据保留形式。
缺点:
(1) 大小受到限制 大多数浏览器对 Cookie 的大小有 4096 字节的限制，尽管在当今新的浏览器和客户端设备版本中，支持 8192 字节的 Cookie 大小已愈发常见。
(2)用户配置为禁用 有些用户禁用了浏览器或客户端设备接收 Cookie 的能力，因此限制了这一功能。
(3) 潜在的安全风险 Cookie 可能会被篡改。用户可能会操纵其计算机上的 Cookie，这意味着会对安全性造成潜在风险或者导致依赖于 Cookie 的应用程序失败。另外，虽然 Cookie 只能被将它们发送到客户端的域访问，历史上黑客已经发现从用户计算机上的其他域访问 Cookie 的方法。您可以手动加密和解密 Cookie，但这需要额外的编码，并且因为加密和解密需要耗费一定的时间而影响应用程序的性能。
具体为什么要用Cookie结合业务需要。
对于我为什么用Cookie?而不用session，session存储服务器端，并不是全局的，而且随着用户越来越多，每个用户都有与之对应的session,对于服务器而言，无形之间形成了不小的并发。
而使用cookie，cookie虽然有安全方面的风险，但是是全局的，全局唯一一个cookie，只需将用户关键信息，例如id或用户名之类的存储其中，这样我每个页面都可以获取的到。这样实现拦截非法登录的效果也是很好的，而且无形之间减少了很多并发。当然就目前而言，对我来说，使用cookie不再向之前为了获取session，搞个拦截器过滤器，真的有种白了少年头，空悲切的感觉啊！