一、背景说明
在一些特殊的业务场景中，前端的输入内容需要加密后传到服务器，由服务器解密后再进行下一步操作，这过程中就涉及到了加密、解密的过程，下面以vue前端工程为例，进行DES加密、解密。
二、代码实现
1) 前端加密、解密js代码实现：des.js
//前端加密、解密js
//前端 Des 加解密-----------------------------
const _default_key = '_default_key';
/**
* 加密
* @param {*} text
* @param {*} key
* @returns
*/
function desEncrypt(text, key) {
console.log("desEncrypt", text);
let keyNew = (typeof (key) == 'undefined' || key == null || key == '') ? _default_key : key
return _stringToHex(_des_base(keyNew, text, 1, 0));
}
/**
* 解密
* @param {*} text
* @param {*} key
* @returns
*/
function desDecrypt(text, key) {
let keyNew = (typeof (key) == 'undefined' || key == null || key == '') ? _default_key : key
return _removeEmptyChar(_des_base(keyNew, _hexTostring(text), 0, 0));
}
//加解密主函数
function _des_base(key, message, encrypt, mode, iv) {
let spfunction1 = new Array(0x1010400, 0, 0x10000, 0x1010404, 0x1010004, 0x10404, 0x4, 0x10000, 0x400, 0x1010400, 0x1010404, 0x400, 0x1000404, 0x1010004, 0x1000000, 0x4, 0x404, 0x1000400, 0x1000400, 0x10400, 0x10400, 0x1010000, 0x1010000, 0x1000404, 0x10004, 0x1000004, 0x1000004, 0x10004, 0, 0x404, 0x10404, 0x1000000, 0x10000, 0x1010404, 0x4, 0x1010000, 0x1010400, 0x1000000, 0x1000000, 0x400, 0x1010004, 0x10000, 0x10400, 0x1000004, 0x400, 0x4, 0x1000404, 0x10404, 0x1010404, 0x10004, 0x1010000, 0x1000404, 0x1000004, 0x404, 0x10404, 0x1010400, 0x404, 0x1000400, 0x1000400, 0, 0x10004, 0x10400, 0, 0x1010004);
let spfunction2 = new Array(-0x7fef7fe0, -0x7fff8000, 0x8000, 0x108020, 0x100000, 0x20, -0x7fefffe0, -0x7fff7fe0, -0x7fffffe0, -0x7fef7fe0, -0x7fef8000, -0x8000000, -0x7fff8000, 0x100000, 0x20, -0x7fefffe0, 0x108000, 0x100020, -0x7fff7fe0, 0, -0x8000000, 0x8000, 0x108020, -0x7ff00000, 0x100020, -0x7fffffe0, 0, 0x108000, 0x8020, -0x7fef8000, -0x7ff00000, 0x8020, 0, 0x108020, -0x7fefffe0, 0x100000, -0x7fff7fe0, -0x7ff00000, -0x7fef8000, 0x8000, -0x7ff00000, -0x7fff8000, 0x20, -0x7fef7fe0, 0x108020, 0x20, 0x8000, -0x8000000, 0x8020, -0x7fef8000, 0x100000, -0x7fffffe0, 0x100020, -0x7fff7fe0, -0x7fffffe0, 0x100020, 0x108000, 0, -0x7fff8000, 0x8020, -0x8000000, -0x7fefffe0, -0x7fef7fe0, 0x108000);
let spfunction3 = new Array(0x208, 0x8020200, 0, 0x8020008, 0x8000200, 0, 0x20208, 0x8000200, 0x20008, 0x8000008, 0x8000008, 0x20000, 0x8020208, 0x20008, 0x8020000, 0x208, 0x8000000, 0x8, 0x8020200, 0x200, 0x20200, 0x8020000, 0x8020008, 0x20208, 0x8000208, 0x20200, 0x20000, 0x8000208, 0x8, 0x8020208, 0x200, 0x8000000, 0x8020200, 0x8000000, 0x20008, 0x208, 0x20000, 0x8020200, 0x8000200, 0, 0x200, 0x20008, 0x8020208, 0x8000200, 0x8000008, 0x200, 0, 0x8020008, 0x8000208, 0x20000, 0x8000000, 0x8020208, 0x8, 0x20208, 0x20200, 0x8000008, 0x8020000, 0x8000208, 0x208, 0x8020000, 0x20208, 0x8, 0x8020008, 0x20200);
let spfunction4 = new Array(0x802001, 0x2081, 0x2081, 0x80, 0x802080, 0x800081, 0x800001, 0x2001, 0, 0x802000, 0x802000, 0x802081, 0x81, 0, 0x800080, 0x800001, 0x1, 0x2000, 0x800000, 0x802001, 0x80, 0x800000, 0x2001, 0x2080, 0x800081, 0x1, 0x2080, 0x800080, 0x2000, 0x802080, 0x802081, 0x81, 0x800080, 0x800001, 0x802000, 0x802081, 0x81, 0, 0, 0x802000, 0x2080, 0x800080, 0x800081, 0x1, 0x802001, 0x2081, 0x2081, 0x80, 0x802081, 0x81, 0x1, 0x2000, 0x800001, 0x2001, 0x802080, 0x800081, 0x2001, 0x2080, 0x800000, 0x802001, 0x80, 0x800000, 0x2000, 0x802080);
let spfunction5 = new Array(0x100, 0x2080100, 0x2080000, 0x42000100, 0x80000, 0x100, 0x40000000, 0x2080000, 0x40080100, 0x80000, 0x2000100, 0x40080100, 0x42000100, 0x42080000, 0x80100, 0x40000000, 0x2000000, 0x40080000, 0x40080000, 0, 0x40000100, 0x42080100, 0x42080100, 0x2000100, 0x42080000, 0x40000100, 0, 0x42000000, 0x2080100, 0x2000000, 0x42000000, 0x80100, 0x80000, 0x42000100, 0x100, 0x2000000, 0x40000000, 0x2080000, 0x42000100, 0x40080100, 0x2000100, 0x40000000, 0x42080000, 0x2080100, 0x40080100, 0x100, 0x2000000, 0x42080000, 0x42080100, 0x80100, 0x42000000, 0x42080100, 0x2080000, 0, 0x40080000, 0x42000000, 0x80100, 0x2000100, 0x40000100, 0x80000, 0, 0x40080000, 0x2080100, 0x40000100);
let spfunction6 = new Array(0x20000010, 0x20400000, 0x4000, 0x20404010, 0x20400000, 0x10, 0x20404010, 0x400000, 0x20004000, 0x404010, 0x400000, 0x20000010, 0x400010, 0x20004000, 0x20000000, 0x4010, 0, 0x400010, 0x20004010, 0x4000, 0x404000, 0x20004010, 0x10, 0x20400010, 0x20400010, 0, 0x404010, 0x20404000, 0x4010, 0x404000, 0x20404000, 0x20000000, 0x20004000, 0x10, 0x20400010, 0x404000, 0x20404010, 0x400000, 0x4010, 0x20000010, 0x400000, 0x20004000, 0x20000000, 0x4010, 0x20000010, 0x20404010, 0x404000, 0x20400000, 0x404010, 0x20404000, 0, 0x20400010, 0x10, 0x4000, 0x20400000, 0x404010, 0x4000, 0x400010, 0x20004010, 0, 0x20404000, 0x20000000, 0x400010, 0x20004010);
let spfunction7 = new Array(0x200000, 0x4200002, 0x4000802, 0, 0x800, 0x4000802, 0x200802, 0x4200800, 0x4200802, 0x200000, 0, 0x4000002, 0x2, 0x4000000, 0x4200002, 0x802, 0x4000800, 0x200802, 0x200002, 0x4000800, 0x4000002, 0x4200000, 0x4200800, 0x200002, 0x4200000, 0x800, 0x802, 0x4200802, 0x200800, 0x2, 0x4000000, 0x200800, 0x4000000, 0x200800, 0x200000, 0x4000802, 0x4000802, 0x4200002, 0x4200002, 0x2, 0x200002, 0x4000000, 0x4000800, 0x200000, 0x4200800, 0x802, 0x200802, 0x4200800, 0x802, 0x4000002, 0x4200802, 0x4200000, 0x200800, 0, 0x2, 0x4200802, 0, 0x200802, 0x4200000, 0x800, 0x4000002, 0x4000800, 0x800, 0x200002);
let spfunction8 = new Array(0x10001040, 0x1000, 0x40000, 0x10041040, 0x10000000, 0x10001040, 0x40, 0x10000000, 0x40040, 0x10040000, 0x10041040, 0x41000, 0x10041000, 0x41040, 0x1000, 0x40, 0x10040000, 0x10000040, 0x10001000, 0x1040, 0x41000, 0x40040, 0x10040040, 0x10041000, 0x1040, 0, 0, 0x10040040, 0x10000040, 0x10001000, 0x41040, 0x40000, 0x41040, 0x40000, 0x10041000, 0x1000, 0x40, 0x10040040, 0x1000, 0x41040, 0x10001000, 0x40, 0x10000040, 0x10040000, 0x10040040, 0x10000000, 0x40000, 0x10001040, 0, 0x10041040, 0x40040, 0x10000040, 0x10040000, 0x10001000, 0x10001040, 0, 0x10041040, 0x41000, 0x41000, 0x1040, 0x1040, 0x40040, 0x10000000, 0x10041000);
let keys = _des_createKeys(key);
let m = 0, i, j, temp, temp2, right1, right2, left, right, looping;
let cbcleft, cbcleft2, cbcright, cbcright2;
let endloop, loopinc;
let len = message.length;
let chunk = 0;
let iterations = keys.length == 32 ? 3 : 9;
if (iterations == 3) {
looping = encrypt ? new Array(0, 32, 2) : new Array(30, -2, -2);
}
else {
looping = encrypt ? new Array(0, 32, 2, 62, 30, -2, 64, 96, 2) : new Array(94, 62, -2, 32, 64, 2, 30, -2, -2);
}
message += "\0\0\0\0\0\0";
let result = "";
let tempresult = "";
if (mode == 1) {
cbcleft = (iv.charCodeAt(m++) << 24) | (iv.charCodeAt(m++) << 16) | (iv.charCodeAt(m++) << 8) | iv.charCodeAt(m++);
cbcright = (iv.charCodeAt(m++) << 24) | (iv.charCodeAt(m++) << 16) | (iv.charCodeAt(m++) << 8) | iv.charCodeAt(m++); m = 0;
}
while (m < len) {
if (encrypt) {
left = (message.charCodeAt(m++) << 16) | message.charCodeAt(m++); right = (message.charCodeAt(m++) << 16) | message.charCodeAt(m++);
}
else {
left = (message.charCodeAt(m++) << 24) | (message.charCodeAt(m++) << 16) | (message.charCodeAt(m++) << 8) | message.charCodeAt(m++);
right = (message.charCodeAt(m++) << 24) | (message.charCodeAt(m++) << 16) | (message.charCodeAt(m++) << 8) | message.charCodeAt(m++);
}
if (mode == 1) {
if (encrypt) {
left ^= cbcleft; right ^= cbcright;
}
else {
cbcleft2 = cbcleft; cbcright2 = cbcright; cbcleft = left; cbcright = right;
}
}
temp = ((left >>> 4) ^ right) & 0x0f0f0f0f;
right ^= temp;
left ^= (temp << 4);
temp = ((left >>> 16) ^ right) & 0x0000ffff;
right ^= temp;
left ^= (temp << 16);
temp = ((right >>> 2) ^ left) & 0x33333333;
left ^= temp;
right ^= (temp << 2);
temp = ((right >>> 8) ^ left) & 0x00ff00ff;
left ^= temp; right ^= (temp << 8);
temp = ((left >>> 1) ^ right) & 0x55555555;
right ^= temp;
left ^= (temp << 1);
left = ((left << 1) | (left >>> 31));
right = ((right << 1) | (right >>> 31));
for (j = 0; j < iterations; j += 3) {
endloop = looping[j + 1];
loopinc = looping[j + 2];
for (i = looping[j]; i != endloop; i += loopinc) {
right1 = right ^ keys[i];
right2 = ((right >>> 4) | (right << 28)) ^ keys[i + 1];
temp = left;
left = right;
right = temp ^ (spfunction2[(right1 >>> 24) & 0x3f] | spfunction4[(right1 >>> 16) & 0x3f] | spfunction6[(right1 >>> 8) & 0x3f] | spfunction8[right1 & 0x3f] | spfunction1[(right2 >>> 24) & 0x3f] | spfunction3[(right2 >>> 16) & 0x3f] | spfunction5[(right2 >>> 8) & 0x3f] | spfunction7[right2 & 0x3f]);
}
temp = left;
left = right;
right = temp;
}
left = ((left >>> 1) | (left << 31));
right = ((right >>> 1) | (right << 31));
temp = ((left >>> 1) ^ right) & 0x55555555;
right ^= temp; left ^= (temp << 1);
temp = ((right >>> 8) ^ left) & 0x00ff00ff;
left ^= temp; right ^= (temp << 8);
temp = ((right >>> 2) ^ left) & 0x33333333;
left ^= temp; right ^= (temp << 2);
temp = ((left >>> 16) ^ right) & 0x0000ffff;
right ^= temp; left ^= (temp << 16);
temp = ((left >>> 4) ^ right) & 0x0f0f0f0f;
right ^= temp; left ^= (temp << 4);
if (mode == 1) {
if (encrypt) {
cbcleft = left;
cbcright = right;
}
else {
left ^= cbcleft2;
right ^= cbcright2;
}
}
if (encrypt) {
tempresult += String.fromCharCode((left >>> 24), ((left >>> 16) & 0xff), ((left >>> 8) & 0xff), (left & 0xff), (right >>> 24), ((right >>> 16) & 0xff), ((right >>> 8) & 0xff), (right & 0xff));
}
else {
tempresult += String.fromCharCode(((left >>> 16) & 0xffff), (left & 0xffff), ((right >>> 16) & 0xffff), (right & 0xffff));
}
encrypt ? chunk += 16 : chunk += 8;
if (chunk == 512) {
result += tempresult;
tempresult = "";
chunk = 0;
}
}
return result + tempresult;
}
//密钥生成函数
function _des_createKeys(key) {
let pc2bytes0 = new Array(0, 0x4, 0x20000000, 0x20000004, 0x10000, 0x10004, 0x20010000, 0x20010004, 0x200, 0x204, 0x20000200, 0x20000204, 0x10200, 0x10204, 0x20010200, 0x20010204);
let pc2bytes1 = new Array(0, 0x1, 0x100000, 0x100001, 0x4000000, 0x4000001, 0x4100000, 0x4100001, 0x100, 0x101, 0x100100, 0x100101, 0x4000100, 0x4000101, 0x4100100, 0x4100101);
let pc2bytes2 = new Array(0, 0x8, 0x800, 0x808, 0x1000000, 0x1000008, 0x1000800, 0x1000808, 0, 0x8, 0x800, 0x808, 0x1000000, 0x1000008, 0x1000800, 0x1000808);
let pc2bytes3 = new Array(0, 0x200000, 0x8000000, 0x8200000, 0x2000, 0x202000, 0x8002000, 0x8202000, 0x20000, 0x220000, 0x8020000, 0x8220000, 0x22000, 0x222000, 0x8022000, 0x8222000);
let pc2bytes4 = new Array(0, 0x40000, 0x10, 0x40010, 0, 0x40000, 0x10, 0x40010, 0x1000, 0x41000, 0x1010, 0x41010, 0x1000, 0x41000, 0x1010, 0x41010);
let pc2bytes5 = new Array(0, 0x400, 0x20, 0x420, 0, 0x400, 0x20, 0x420, 0x2000000, 0x2000400, 0x2000020, 0x2000420, 0x2000000, 0x2000400, 0x2000020, 0x2000420);
let pc2bytes6 = new Array(0, 0x10000000, 0x80000, 0x10080000, 0x2, 0x10000002, 0x80002, 0x10080002, 0, 0x10000000, 0x80000, 0x10080000, 0x2, 0x10000002, 0x80002, 0x10080002);
let pc2bytes7 = new Array(0, 0x10000, 0x800, 0x10800, 0x20000000, 0x20010000, 0x20000800, 0x20010800, 0x20000, 0x30000, 0x20800, 0x30800, 0x20020000, 0x20030000, 0x20020800, 0x20030800);
let pc2bytes8 = new Array(0, 0x40000, 0, 0x40000, 0x2, 0x40002, 0x2, 0x40002, 0x2000000, 0x2040000, 0x2000000, 0x2040000, 0x2000002, 0x2040002, 0x2000002, 0x2040002);
let pc2bytes9 = new Array(0, 0x10000000, 0x8, 0x10000008, 0, 0x10000000, 0x8, 0x10000008, 0x400, 0x10000400, 0x408, 0x10000408, 0x400, 0x10000400, 0x408, 0x10000408);
let pc2bytes10 = new Array(0, 0x20, 0, 0x20, 0x100000, 0x100020, 0x100000, 0x100020, 0x2000, 0x2020, 0x2000, 0x2020, 0x102000, 0x102020, 0x102000, 0x102020);
let pc2bytes11 = new Array(0, 0x1000000, 0x200, 0x1000200, 0x200000, 0x1200000, 0x200200, 0x1200200, 0x4000000, 0x5000000, 0x4000200, 0x5000200, 0x4200000, 0x5200000, 0x4200200, 0x5200200);
let pc2bytes12 = new Array(0, 0x1000, 0x8000000, 0x8001000, 0x80000, 0x81000, 0x8080000, 0x8081000, 0x10, 0x1010, 0x8000010, 0x8001010, 0x80010, 0x81010, 0x8080010, 0x8081010);
let pc2bytes13 = new Array(0, 0x4, 0x100, 0x104, 0, 0x4, 0x100, 0x104, 0x1, 0x5, 0x101, 0x105, 0x1, 0x5, 0x101, 0x105);
let iterations = key.length >= 24 ? 3 : 1;
let keys = new Array(32 * iterations);
let shifts = new Array(0, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0);
let lefttemp, righttemp, m = 0, n = 0, temp;
for (let j = 0; j < iterations; j++) {
let left = (key.charCodeAt(m++) << 24) | (key.charCodeAt(m++) << 16) | (key.charCodeAt(m++) << 8) | key.charCodeAt(m++);
let right = (key.charCodeAt(m++) << 24) | (key.charCodeAt(m++) << 16) | (key.charCodeAt(m++) << 8) | key.charCodeAt(m++);
let temp = ((left >>> 4) ^ right) & 0x0f0f0f0f;
right ^= temp;
left ^= (temp << 4);
temp = ((right >>> -16) ^ left) & 0x0000ffff;
left ^= temp;
right ^= (temp << -16);
temp = ((left >>> 2) ^ right) & 0x33333333;
right ^= temp;
left ^= (temp << 2);
temp = ((right >>> -16) ^ left) & 0x0000ffff;
left ^= temp; right ^= (temp << -16);
temp = ((left >>> 1) ^ right) & 0x55555555;
right ^= temp; left ^= (temp << 1);
temp = ((right >>> 8) ^ left) & 0x00ff00ff;
left ^= temp; right ^= (temp << 8);
temp = ((left >>> 1) ^ right) & 0x55555555;
right ^= temp; left ^= (temp << 1);
temp = (left << 8) | ((right >>> 20) & 0x000000f0);
left = (right << 24) | ((right << 8) & 0xff0000) | ((right >>> 8) & 0xff00) | ((right >>> 24) & 0xf0);
right = temp;
for (let i = 0; i < shifts.length; i++) {
if (shifts[i]) {
left = (left << 2) | (left >>> 26); right = (right << 2) | (right >>> 26);
}
else {
left = (left << 1) | (left >>> 27);
right = (right << 1) | (right >>> 27);
}
left &= -0xf;
right &= -0xf;
lefttemp = pc2bytes0[left >>> 28] | pc2bytes1[(left >>> 24) & 0xf] | pc2bytes2[(left >>> 20) & 0xf] | pc2bytes3[(left >>> 16) & 0xf] | pc2bytes4[(left >>> 12) & 0xf] | pc2bytes5[(left >>> 8) & 0xf] | pc2bytes6[(left >>> 4) & 0xf];
righttemp = pc2bytes7[right >>> 28] | pc2bytes8[(right >>> 24) & 0xf] | pc2bytes9[(right >>> 20) & 0xf] | pc2bytes10[(right >>> 16) & 0xf] | pc2bytes11[(right >>> 12) & 0xf] | pc2bytes12[(right >>> 8) & 0xf] | pc2bytes13[(right >>> 4) & 0xf];
temp = ((righttemp >>> 16) ^ lefttemp) & 0x0000ffff;
keys[n++] = lefttemp ^ temp;
keys[n++] = righttemp ^ (temp << 16);
}
}
return keys;
}
//将普通的字符串转换成16进制代码的字符串
function _stringToHex(s) {
let r = ""; let hexes = new Array("0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "A", "B", "C", "D", "E", "F");
for (let i = 0; i < (s.length); i++) { r += hexes[s.charCodeAt(i) >> 4] + hexes[s.charCodeAt(i) & 0xf]; }
return r;
}
//将16进制代码的字符串转换成普通的字符串
function _hexTostring(s) {
let r = "";
for (let i = 0; i < s.length; i += 2) { let sxx = parseInt(s.substring(i, i + 2), 16); r += String.fromCharCode(sxx); }
return r;
}
//处理前端des解密后字串后面的\u0000
function _removeEmptyChar(str) {
let s = '';
let stemp = '\u0000';
for (let i = 0; i < str.length; i++) {
let s1 = str.substr(i, 1);
if (s1 != null && s1 != '' && s1 != stemp) {
s += s1;
}
}
return s;
}
//前端 Des 加解密 结束-----------------------------
export {
desEncrypt,
desDecrypt,
};
2) 前端字符串加密处理
//需加密功能引用js
import {
desEncrypt,
desDecrypt
} from "des.js";
//进行字符串加密，并加加密字符串上传服务器
let strDes= desEncrypt("需加密内容");
3)后端解密实现
using System; using System.Collections.Generic; using System.Linq; using System.Text; ////// C# DES 加解密类 /// public class DesEncrypt { ////// 加密 /// /// 加密前文本 /// 密钥，必须是8位字串，为空取默认的 ///加密后文本 public static string Encrypt(string text, string key = null) { if (string.IsNullOrWhiteSpace(key)) key = DefaultDesKey; var str = _StringToHex(_DES(key, text, true, 0, "")); return str; } ////// 解密 /// /// 解密前文本 /// 密钥，必须是8位字串，为空取默认的 ///解密后文本 public static string Decrypt(string text, string key = null) { if (string.IsNullOrWhiteSpace(key)) key = DefaultDesKey; var str = _DES(key, _HexToString(text), false, 0, ""); //删除字串后面的\0 var chr1 = '\0'; var str2 = str.TrimEnd(new char[] { chr1 }); return str2; } #region 内部 ////// 默认 Key /// public static string DefaultDesKey = "_default_key"; //C# DES加解密主函数 private static string _DES(string key, string strMessage, bool isEncrypt, int mode, string strIV) { int[] spfunction1 = new int[] { 0x1010400, 0, 0x10000, 0x1010404, 0x1010004, 0x10404, 0x4, 0x10000, 0x400, 0x1010400, 0x1010404, 0x400, 0x1000404, 0x1010004, 0x1000000, 0x4, 0x404, 0x1000400, 0x1000400, 0x10400, 0x10400, 0x1010000, 0x1010000, 0x1000404, 0x10004, 0x1000004, 0x1000004, 0x10004, 0, 0x404, 0x10404, 0x1000000, 0x10000, 0x1010404, 0x4, 0x1010000, 0x1010400, 0x1000000, 0x1000000, 0x400, 0x1010004, 0x10000, 0x10400, 0x1000004, 0x400, 0x4, 0x1000404, 0x10404, 0x1010404, 0x10004, 0x1010000, 0x1000404, 0x1000004, 0x404, 0x10404, 0x1010400, 0x404, 0x1000400, 0x1000400, 0, 0x10004, 0x10400, 0, 0x1010004 }; int[] spfunction2 = new int[] { -0x7fef7fe0, -0x7fff8000, 0x8000, 0x108020, 0x100000, 0x20, -0x7fefffe0, -0x7fff7fe0, -0x7fffffe0, -0x7fef7fe0, -0x7fef8000, -0x8000000, -0x7fff8000, 0x100000, 0x20, -0x7fefffe0, 0x108000, 0x100020, -0x7fff7fe0, 0, -0x8000000, 0x8000, 0x108020, -0x7ff00000, 0x100020, -0x7fffffe0, 0, 0x108000, 0x8020, -0x7fef8000, -0x7ff00000, 0x8020, 0, 0x108020, -0x7fefffe0, 0x100000, -0x7fff7fe0, -0x7ff00000, -0x7fef8000, 0x8000, -0x7ff00000, -0x7fff8000, 0x20, -0x7fef7fe0, 0x108020, 0x20, 0x8000, -0x8000000, 0x8020, -0x7fef8000, 0x100000, -0x7fffffe0, 0x100020, -0x7fff7fe0, -0x7fffffe0, 0x100020, 0x108000, 0, -0x7fff8000, 0x8020, -0x8000000, -0x7fefffe0, -0x7fef7fe0, 0x108000 }; int[] spfunction3 = new int[] { 0x208, 0x8020200, 0, 0x8020008, 0x8000200, 0, 0x20208, 0x8000200, 0x20008, 0x8000008, 0x8000008, 0x20000, 0x8020208, 0x20008, 0x8020000, 0x208, 0x8000000, 0x8, 0x8020200, 0x200, 0x20200, 0x8020000, 0x8020008, 0x20208, 0x8000208, 0x20200, 0x20000, 0x8000208, 0x8, 0x8020208, 0x200, 0x8000000, 0x8020200, 0x8000000, 0x20008, 0x208, 0x20000, 0x8020200, 0x8000200, 0, 0x200, 0x20008, 0x8020208, 0x8000200, 0x8000008, 0x200, 0, 0x8020008, 0x8000208, 0x20000, 0x8000000, 0x8020208, 0x8, 0x20208, 0x20200, 0x8000008, 0x8020000, 0x8000208, 0x208, 0x8020000, 0x20208, 0x8, 0x8020008, 0x20200 }; int[] spfunction4 = new int[] { 0x802001, 0x2081, 0x2081, 0x80, 0x802080, 0x800081, 0x800001, 0x2001, 0, 0x802000, 0x802000, 0x802081, 0x81, 0, 0x800080, 0x800001, 0x1, 0x2000, 0x800000, 0x802001, 0x80, 0x800000, 0x2001, 0x2080, 0x800081, 0x1, 0x2080, 0x800080, 0x2000, 0x802080, 0x802081, 0x81, 0x800080, 0x800001, 0x802000, 0x802081, 0x81, 0, 0, 0x802000, 0x2080, 0x800080, 0x800081, 0x1, 0x802001, 0x2081, 0x2081, 0x80, 0x802081, 0x81, 0x1, 0x2000, 0x800001, 0x2001, 0x802080, 0x800081, 0x2001, 0x2080, 0x800000, 0x802001, 0x80, 0x800000, 0x2000, 0x802080 }; int[] spfunction5 = new int[] { 0x100, 0x2080100, 0x2080000, 0x42000100, 0x80000, 0x100, 0x40000000, 0x2080000, 0x40080100, 0x80000, 0x2000100, 0x40080100, 0x42000100, 0x42080000, 0x80100, 0x40000000, 0x2000000, 0x40080000, 0x40080000, 0, 0x40000100, 0x42080100, 0x42080100, 0x2000100, 0x42080000, 0x40000100, 0, 0x42000000, 0x2080100, 0x2000000, 0x42000000, 0x80100, 0x80000, 0x42000100, 0x100, 0x2000000, 0x40000000, 0x2080000, 0x42000100, 0x40080100, 0x2000100, 0x40000000, 0x42080000, 0x2080100, 0x40080100, 0x100, 0x2000000, 0x42080000, 0x42080100, 0x80100, 0x42000000, 0x42080100, 0x2080000, 0, 0x40080000, 0x42000000, 0x80100, 0x2000100, 0x40000100, 0x80000, 0, 0x40080000, 0x2080100, 0x40000100 }; int[] spfunction6 = new int[] { 0x20000010, 0x20400000, 0x4000, 0x20404010, 0x20400000, 0x10, 0x20404010, 0x400000, 0x20004000, 0x404010, 0x400000, 0x20000010, 0x400010, 0x20004000, 0x20000000, 0x4010, 0, 0x400010, 0x20004010, 0x4000, 0x404000, 0x20004010, 0x10, 0x20400010, 0x20400010, 0, 0x404010, 0x20404000, 0x4010, 0x404000, 0x20404000, 0x20000000, 0x20004000, 0x10, 0x20400010, 0x404000, 0x20404010, 0x400000, 0x4010, 0x20000010, 0x400000, 0x20004000, 0x20000000, 0x4010, 0x20000010, 0x20404010, 0x404000, 0x20400000, 0x404010, 0x20404000, 0, 0x20400010, 0x10, 0x4000, 0x20400000, 0x404010, 0x4000, 0x400010, 0x20004010, 0, 0x20404000, 0x20000000, 0x400010, 0x20004010 }; int[] spfunction7 = new int[] { 0x200000, 0x4200002, 0x4000802, 0, 0x800, 0x4000802, 0x200802, 0x4200800, 0x4200802, 0x200000, 0, 0x4000002, 0x2, 0x4000000, 0x4200002, 0x802, 0x4000800, 0x200802, 0x200002, 0x4000800, 0x4000002, 0x4200000, 0x4200800, 0x200002, 0x4200000, 0x800, 0x802, 0x4200802, 0x200800, 0x2, 0x4000000, 0x200800, 0x4000000, 0x200800, 0x200000, 0x4000802, 0x4000802, 0x4200002, 0x4200002, 0x2, 0x200002, 0x4000000, 0x4000800, 0x200000, 0x4200800, 0x802, 0x200802, 0x4200800, 0x802, 0x4000002, 0x4200802, 0x4200000, 0x200800, 0, 0x2, 0x4200802, 0, 0x200802, 0x4200000, 0x800, 0x4000002, 0x4000800, 0x800, 0x200002 }; int[] spfunction8 = new int[] { 0x10001040, 0x1000, 0x40000, 0x10041040, 0x10000000, 0x10001040, 0x40, 0x10000000, 0x40040, 0x10040000, 0x10041040, 0x41000, 0x10041000, 0x41040, 0x1000, 0x40, 0x10040000, 0x10000040, 0x10001000, 0x1040, 0x41000, 0x40040, 0x10040040, 0x10041000, 0x1040, 0, 0, 0x10040040, 0x10000040, 0x10001000, 0x41040, 0x40000, 0x41040, 0x40000, 0x10041000, 0x1000, 0x40, 0x10040040, 0x1000, 0x41040, 0x10001000, 0x40, 0x10000040, 0x10040000, 0x10040040, 0x10000000, 0x40000, 0x10001040, 0, 0x10041040, 0x40040, 0x10000040, 0x10040000, 0x10001000, 0x10001040, 0, 0x10041040, 0x41000, 0x41000, 0x1040, 0x1040, 0x40040, 0x10000000, 0x10041000 }; int[] keys = _DES_CreateKey(key); int m = 0, i, j, temp, right1, right2, left, right; int[] looping; int cbcleft = 0, cbcleft2 = 0, cbcright = 0, cbcright2 = 0; int endloop, loopinc; int len = strMessage.Length; int chunk = 0; int iterations = (keys.Length == 32) ? 3 : 9; if (iterations == 3) { looping = isEncrypt ? new int[] { 0, 32, 2 } : new int[] { 30, -2, -2 }; } else { looping = isEncrypt ? new int[] { 0, 32, 2, 62, 30, -2, 64, 96, 2 } : new int[] { 94, 62, -2, 32, 64, 2, 30, -2, -2 }; } strMessage += "\0\0\0\0\0\0\0\0"; StringBuilder result = new StringBuilder(); StringBuilder tempresult = new StringBuilder(); if (mode == 1) { int ivLen = strIV.Length; char[] civ = strIV.ToCharArray(); int[] iv = new int[ivLen + 8]; for (i = 0; i < ivLen; i++) { iv[i] = Convert.ToInt32(civ[i]); } for (i = ivLen; i < (ivLen + 8); ++i) { iv[i] = 0; } cbcleft = (iv[m++] << 24) | (iv[m++] << 16) | (iv[m++] << 8) | iv[m++]; cbcright = (iv[m++] << 24) | (iv[m++] << 16) | (iv[m++] << 8) | iv[m++]; m = 0; } while (m < len) { int[] message = new int[len + 8]; char[] cm = strMessage.ToCharArray(); for (i = 0; i < (len + 8); ++i) { message[i] = Convert.ToInt32(cm[i]); } if (isEncrypt) { left = (message[m++] << 16) | message[m++]; right = (message[m++] << 16) | message[m++]; } else { left = (message[m++] << 24) | (message[m++] << 16) | (message[m++] << 8) | message[m++]; right = (message[m++] << 24) | (message[m++] << 16) | (message[m++] << 8) | message[m++]; } if (mode == 1) { if (isEncrypt) { left ^= cbcleft; right ^= cbcright; } else { cbcleft2 = cbcleft; cbcright2 = cbcright; cbcleft = left; cbcright = right; } } temp = (_MoveByte(left, 4) ^ right) & 0x0f0f0f0f; right ^= temp; left ^= (temp << 4); temp = (_MoveByte(left, 16) ^ right) & 0x0000ffff; right ^= temp; left ^= (temp << 16); temp = (_MoveByte(right, 2) ^ left) & 0x33333333; left ^= temp; right ^= (temp << 2); temp = (_MoveByte(right, 8) ^ left) & 0x00ff00ff; left ^= temp; right ^= (temp << 8); temp = (_MoveByte(left, 1) ^ right) & 0x55555555; right ^= temp; left ^= (temp << 1); left = ((left << 1) | _MoveByte(left, 31)); right = ((right << 1) | _MoveByte(right, 31)); for (j = 0; j < iterations; j += 3) { endloop = looping[j + 1]; loopinc = looping[j + 2]; for (i = looping[j]; i != endloop; i += loopinc) { right1 = right ^ keys[i]; right2 = (_MoveByte(right, 4) | (right << 28)) ^ keys[i + 1]; temp = left; left = right; right = temp ^ (spfunction2[_MoveByte(right1, 24) & 0x3f] | spfunction4[_MoveByte(right1, 16) & 0x3f] | spfunction6[_MoveByte(right1, 8) & 0x3f] | spfunction8[right1 & 0x3f] | spfunction1[_MoveByte(right2, 24) & 0x3f] | spfunction3[_MoveByte(right2, 16) & 0x3f] | spfunction5[_MoveByte(right2, 8) & 0x3f] | spfunction7[right2 & 0x3f]); } temp = left; left = right; right = temp; } left = (_MoveByte(left, 1) | (left << 31)); right = (_MoveByte(right, 1) | (right << 31)); temp = (_MoveByte(left, 1) ^ right) & 0x55555555; right ^= temp; left ^= (temp << 1); temp = (_MoveByte(right, 8) ^ left) & 0x00ff00ff; left ^= temp; right ^= (temp << 8); temp = (_MoveByte(right, 2) ^ left) & 0x33333333; left ^= temp; right ^= (temp << 2); temp = (_MoveByte(left, 16) ^ right) & 0x0000ffff; right ^= temp; left ^= (temp << 16); temp = (_MoveByte(left, 4) ^ right) & 0x0f0f0f0f; right ^= temp; left ^= (temp << 4); if (mode == 1) { if (isEncrypt) { cbcleft = left; cbcright = right; } else { left ^= cbcleft2; right ^= cbcright2; } } if (isEncrypt) { tempresult.Append(Convert.ToChar((_MoveByte(left, 24)))); tempresult.Append(Convert.ToChar((_MoveByte(left, 16) & 0xff))); tempresult.Append(Convert.ToChar((_MoveByte(left, 8) & 0xff))); tempresult.Append(Convert.ToChar((left & 0xff))); tempresult.Append(Convert.ToChar(_MoveByte(right, 24))); tempresult.Append(Convert.ToChar((_MoveByte(right, 16) & 0xff))); tempresult.Append(Convert.ToChar((_MoveByte(right, 8) & 0xff))); tempresult.Append(Convert.ToChar((right & 0xff))); } else { tempresult.Append(Convert.ToChar(((_MoveByte(left, 16) & 0xffff)))); tempresult.Append(Convert.ToChar((left & 0xffff))); tempresult.Append(Convert.ToChar((_MoveByte(right, 16) & 0xffff))); tempresult.Append(Convert.ToChar((right & 0xffff))); } if (isEncrypt) { chunk += 16; } else { chunk += 8; } if (chunk == 512) { result.Append(tempresult.ToString()); tempresult.Remove(0, tempresult.Length); chunk = 0; } } return result.ToString() + tempresult.ToString(); } //密钥生成函数 private static int[] _DES_CreateKey(string strKey) { int[] pc2bytes0 = new int[] { 0, 0x4, 0x20000000, 0x20000004, 0x10000, 0x10004, 0x20010000, 0x20010004, 0x200, 0x204, 0x20000200, 0x20000204, 0x10200, 0x10204, 0x20010200, 0x20010204 }; int[] pc2bytes1 = new int[] { 0, 0x1, 0x100000, 0x100001, 0x4000000, 0x4000001, 0x4100000, 0x4100001, 0x100, 0x101, 0x100100, 0x100101, 0x4000100, 0x4000101, 0x4100100, 0x4100101 }; int[] pc2bytes2 = new int[] { 0, 0x8, 0x800, 0x808, 0x1000000, 0x1000008, 0x1000800, 0x1000808, 0, 0x8, 0x800, 0x808, 0x1000000, 0x1000008, 0x1000800, 0x1000808 }; int[] pc2bytes3 = new int[] { 0, 0x200000, 0x8000000, 0x8200000, 0x2000, 0x202000, 0x8002000, 0x8202000, 0x20000, 0x220000, 0x8020000, 0x8220000, 0x22000, 0x222000, 0x8022000, 0x8222000 }; int[] pc2bytes4 = new int[] { 0, 0x40000, 0x10, 0x40010, 0, 0x40000, 0x10, 0x40010, 0x1000, 0x41000, 0x1010, 0x41010, 0x1000, 0x41000, 0x1010, 0x41010 }; int[] pc2bytes5 = new int[] { 0, 0x400, 0x20, 0x420, 0, 0x400, 0x20, 0x420, 0x2000000, 0x2000400, 0x2000020, 0x2000420, 0x2000000, 0x2000400, 0x2000020, 0x2000420 }; int[] pc2bytes6 = new int[] { 0, 0x10000000, 0x80000, 0x10080000, 0x2, 0x10000002, 0x80002, 0x10080002, 0, 0x10000000, 0x80000, 0x10080000, 0x2, 0x10000002, 0x80002, 0x10080002 }; int[] pc2bytes7 = new int[] { 0, 0x10000, 0x800, 0x10800, 0x20000000, 0x20010000, 0x20000800, 0x20010800, 0x20000, 0x30000, 0x20800, 0x30800, 0x20020000, 0x20030000, 0x20020800, 0x20030800 }; int[] pc2bytes8 = new int[] { 0, 0x40000, 0, 0x40000, 0x2, 0x40002, 0x2, 0x40002, 0x2000000, 0x2040000, 0x2000000, 0x2040000, 0x2000002, 0x2040002, 0x2000002, 0x2040002 }; int[] pc2bytes9 = new int[] { 0, 0x10000000, 0x8, 0x10000008, 0, 0x10000000, 0x8, 0x10000008, 0x400, 0x10000400, 0x408, 0x10000408, 0x400, 0x10000400, 0x408, 0x10000408 }; int[] pc2bytes10 = new int[] { 0, 0x20, 0, 0x20, 0x100000, 0x100020, 0x100000, 0x100020, 0x2000, 0x2020, 0x2000, 0x2020, 0x102000, 0x102020, 0x102000, 0x102020 }; int[] pc2bytes11 = new int[] { 0, 0x1000000, 0x200, 0x1000200, 0x200000, 0x1200000, 0x200200, 0x1200200, 0x4000000, 0x5000000, 0x4000200, 0x5000200, 0x4200000, 0x5200000, 0x4200200, 0x5200200 }; int[] pc2bytes12 = new int[] { 0, 0x1000, 0x8000000, 0x8001000, 0x80000, 0x81000, 0x8080000, 0x8081000, 0x10, 0x1010, 0x8000010, 0x8001010, 0x80010, 0x81010, 0x8080010, 0x8081010 }; int[] pc2bytes13 = new int[] { 0, 0x4, 0x100, 0x104, 0, 0x4, 0x100, 0x104, 0x1, 0x5, 0x101, 0x105, 0x1, 0x5, 0x101, 0x105 }; int iterations = strKey.Length >= 24 ? 3 : 1; int[] keys = new int[32 * iterations]; int[] shifts = new int[] { 0, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0 }; int lefttemp, righttemp; int m = 0, n = 0; int left, right, temp; char[] ckey = strKey.ToCharArray(); int strLen = strKey.Length; int keyLen = strLen + iterations * 8; int[] key = new int[keyLen]; for (int i = 0; i < strLen; ++i) { key[i] = Convert.ToInt32(ckey[i]); } for (int i = strLen; i < keyLen; ++i) { key[i] = 0; } for (int j = 0; j < iterations; j++) { left = (key[m++] << 24) | (key[m++] << 16) | (key[m++] << 8) | key[m++]; right = (key[m++] << 24) | (key[m++] << 16) | (key[m++] << 8) | key[m++]; temp = (_MoveByte(left, 4) ^ right) & 0x0f0f0f0f; right ^= temp; left ^= (temp << 4); temp = (_MoveByte(right, -16) ^ left) & 0x0000ffff; left ^= temp; right ^= (temp << -16); temp = (_MoveByte(left, 2) ^ right) & 0x33333333; right ^= temp; left ^= (temp << 2); temp = (_MoveByte(right, -16) ^ left) & 0x0000ffff; left ^= temp; right ^= (temp << -16); temp = (_MoveByte(left, 1) ^ right) & 0x55555555; right ^= temp; left ^= (temp << 1); temp = (_MoveByte(right, 8) ^ left) & 0x00ff00ff; left ^= temp; right ^= (temp << 8); temp = (_MoveByte(left, 1) ^ right) & 0x55555555; right ^= temp; left ^= (temp << 1); temp = (left << 8) | (_MoveByte(right, 20) & 0x000000f0); left = (right << 24) | ((right << 8) & 0xff0000) | (_MoveByte(right, 8) & 0xff00) | (_MoveByte(right, 24) & 0xf0); right = temp; int shiftLen = shifts.Length; for (int i = 0; i < shiftLen; i++) { if (shifts[i] == 1) { left = (left << 2) | _MoveByte(left, 26); right = (right << 2) | _MoveByte(right, 26); } else { left = (left << 1) | _MoveByte(left, 27); right = (right << 1) | _MoveByte(right, 27); } left &= -0xf; right &= -0xf; lefttemp = pc2bytes0[_MoveByte(left, 28)] | pc2bytes1[_MoveByte(left, 24) & 0xf] | pc2bytes2[_MoveByte(left, 20) & 0xf] | pc2bytes3[_MoveByte(left, 16) & 0xf] | pc2bytes4[_MoveByte(left, 12) & 0xf] | pc2bytes5[_MoveByte(left, 8) & 0xf] | pc2bytes6[_MoveByte(left, 4) & 0xf]; righttemp = pc2bytes7[_MoveByte(right, 28)] | pc2bytes8[_MoveByte(right, 24) & 0xf] | pc2bytes9[_MoveByte(right, 20) & 0xf] | pc2bytes10[_MoveByte(right, 16) & 0xf] | pc2bytes11[_MoveByte(right, 12) & 0xf] | pc2bytes12[_MoveByte(right, 8) & 0xf] | pc2bytes13[_MoveByte(right, 4) & 0xf]; temp = (_MoveByte(righttemp, 16) ^ lefttemp) & 0x0000ffff; keys[n++] = lefttemp ^ temp; keys[n++] = righttemp ^ (temp << 16); } } return keys; } //实现无符号右移,相当于javascript中的>>>运算符 private static int _MoveByte(int val, int pos) { string strBit = string.Empty; //取得二进制字符串 strBit = Convert.ToString(val, 2); //转成32位长度的二进制 if (val >= 0) { strBit = Convert.ToString(val, 2); int len = strBit.Length; len = 32 - len; for (int i = 0; i < len; ++i) { strBit = "0" + strBit; } } //如果pos小于0,则应移pos + 32位 pos = (pos < 0) ? pos + 32 : pos; for (int i = 0; i < pos; ++i) { strBit = "0" + strBit.Substring(0, 31); } return Convert.ToInt32(strBit, 2); } //将普通的字符串转换成16进制的字符串 private static string _StringToHex(string s) { StringBuilder sb = new StringBuilder(); char[] hexs = new char[] { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' }; int len = s.Length; char[] cs = s.ToCharArray(); for (int i = 0; i < len; ++i) { sb.Append(hexs[cs[i] >> 4]); sb.Append(hexs[cs[i] & 0xf]); } return sb.ToString(); } //将16进制的字符串转换成普通的字符串 private static string _HexToString(string s) { StringBuilder sb = new StringBuilder(); int len = s.Length; char c; for (int i = 0; i < len; i += 2) { c = Convert.ToChar(Convert.ToInt16("0x" + s.Substring(i, 2), 16)); sb.Append(c); } return sb.ToString(); } #endregion }
3)后端字符串解密
string strDes= DesEncrypt.Decrypt("需解密内容");
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