javascript实现des算法(支持微信小程序)

概述：

本代码是本人从c++代码上转换成的javascript代码，并测试验证通过的。考虑放其他地方要么要会员要么容易关闭，不容易被需要的获取到，故直接贴在本文档下面的章节，功能代码。

测试平台：

已经在如下环境中测试通过，其他平台(浏览器)应该也不会有问题：
1、nodejs中node.exe运行
2、微信小程序

功能代码：

function strDesCtxParams() {
  this.keybuf;
  this.keylen;
};

var PC_1 = [ //PC_1置换
  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
];

var Left_Move = [
  1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1
];

var 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
];

var IP = [ //IP置换
  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
];

var Extern = [ //扩展置换
  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
];

var IP_1 = [ //IP逆置换
  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
];

var S_BOX = [ //S盒子
  /* 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,

  /* 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,

  /* 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,

  /* 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,

  /* 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,

  /* 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,

  /* 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,

  /* 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
];

var P = [ //P置换
  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
];


function des_init(keyArray, keyLen) {
  var i = 0;
  var desCtxParams = new strDesCtxParams();

  desCtxParams.keybuf = new Uint8Array(3 * (16 * 6));
  desCtxParams.keylen = keyLen;

  for (i = 0; i < keyLen; i += 8) {
    InputKey(keyArray, i, desCtxParams.keybuf, (16 * 6) * (i / 8));
  }

  //for (i = 0; i < 16 * 6 * 2; i++) {
  //console.log(i + " keybuf " + desCtxParams.keybuf[i]);
  //}
  return desCtxParams;
}

function des_encrypt(desCtxParams, byteArrayDataIn) {
  return des_crypt(desCtxParams, byteArrayDataIn, true);
}

function des_decrypt(desCtxParams, byteArrayDataIn) {
  return des_crypt(desCtxParams, byteArrayDataIn, false);
}


function des_str_to_array(strIn) {
  var bytesArray = new Uint8Array(strIn.length);
  var i = 0;

  for (i = 0; i < strIn.length; i++) {
    bytesArray[i] = strIn.charCodeAt(i);
  }

  return bytesArray;
}

function des_hex_to_array(hexStrIn) {
  var i = 0;
  var cnt = 0;
  var ele = 0;
  var bytesArray = null;

  cnt = 0;
  for (i = 0; i < hexStrIn.length; i++) {
    ele = hexStrIn.charCodeAt(i);
    if (ele >= 48 && ele < 48 + 10) {
      cnt++;
    }
    if (ele >= 65 && ele < 65 + 6) {
      cnt++;
    }
    if (ele >= 97 && ele < 97 + 6) {
      cnt++;
    }
  }
  bytesArray = new Uint8Array(parseInt((cnt + 1) / 2));
  cnt = 0;
  for (i = 0; i < hexStrIn.length; i++) {
    ele = hexStrIn.charCodeAt(i);
    if (ele >= 48 && ele < 48 + 10) {
      ele -= 48;
      cnt++;
    } else if (ele >= 65 && ele < 65 + 6) {
      ele = ele - 65 + 10;
      cnt++;
    } else if (ele >= 97 && ele < 97 + 6) {
      ele = ele - 97 + 10;
      cnt++;
    } else {
      continue;
    }
    if ((cnt % 2) == 1) {
      bytesArray[parseInt((cnt - 1) / 2)] = (ele << 4) & 0xF0;
    } else {
      bytesArray[parseInt((cnt - 1) / 2)] |= ele;
    }
  }

  return bytesArray;
}

function des_hex_to_str(data, len) {
  var sha256_hex_digits = "0123456789abcdef";
  var output = new String();
  var i = 0;

  for (i = 0; i < len; i++) {
    output += sha256_hex_digits.charAt((data[i] >>> 4) & 0x0f);
    output += sha256_hex_digits.charAt((data[i]) & 0x0f);
  }

  return output;
}

function Substitution(subIn, subLen, lpIn, lpInIndex, lpOut, lpOutIndex) {
  //置换
  var i = 0;

  for (i = 0; i < subLen; i++) {
    //console.log(i + " subIn = " + subIn[i]);
    if ((i % 8) == 0) {
      lpOut[parseInt(i / 8) + lpOutIndex] = 0x00;
    }
    /*if (i == 16) {
    	console.log("lpInIndex:" + lpInIndex);
    	console.log("subIn[i]:" + subIn[i]);
    	console.log("parseInt((subIn[i] - 1) / 8) + lpInIndex :" + (((subIn[i] - 1) / 8) + lpInIndex));
    	console.log("lpIn[parseInt((subIn[i] - 1) / 8) + lpInIndex] " + lpIn[parseInt((subIn[i] - 1) / 8) + lpInIndex]);
    	return;
    }*/
    if ((lpIn[parseInt((subIn[i] - 1) / 8) + lpInIndex] & (0x80 >>> ((subIn[i] - 1) % 8))) != 0) {
      lpOut[parseInt(i / 8) + lpOutIndex] |= (0x80 >>> (i % 8));
      //console.log("in " + i);
    }
    //console.log(i + " lpOut :" + lpOut[parseInt(i / 8) + lpOutIndex]);
  }
}

function LeftMove(buf, move) {
  var tmp;

  tmp = buf[0];
  buf[0] <<= move;
  buf[0] |= (buf[1] >> (8 - move));

  buf[1] <<= move;
  buf[1] |= (buf[2] >> (8 - move));

  buf[2] <<= move;
  buf[2] |= (buf[3] >> (8 - move));

  buf[3] &= 0xF0;
  buf[3] <<= move;
  buf[3] |= (tmp >> (8 - 4 - move));
}


function des_crypt(desCtxParams, byteArrayDataIn, isEncrypt) {
  var outResult = new Uint8Array(8);
  var tmpBuf = null;

  if (desCtxParams.keylen == 8) {
    DesCode(byteArrayDataIn, 0, outResult, 0, isEncrypt, desCtxParams.keybuf, 0);
  }
  if (desCtxParams.keylen == 16) {
    tmpBuf = new Uint8Array(16);
    DesCode(byteArrayDataIn, 0, tmpBuf, 0, isEncrypt, desCtxParams.keybuf, 0);
    DesCode(tmpBuf, 0, tmpBuf, 8, !isEncrypt, desCtxParams.keybuf, 16 * 6);
    DesCode(tmpBuf, 8, outResult, 0, isEncrypt, desCtxParams.keybuf, 0);
  }
  if (desCtxParams.keylen == 24) {
    tmpBuf = new Uint8Array(16);
    DesCode(byteArrayDataIn, 0, tmpBuf, 0, isEncrypt, desCtxParams.keybuf, isEncrypt ? 0 : (16 * 6 * 2));
    DesCode(tmpBuf, 0, tmpBuf, 8, !isEncrypt, desCtxParams.keybuf, 16 * 6);
    DesCode(tmpBuf, 8, outResult, 0, isEncrypt, desCtxParams.keybuf, isEncrypt ? (16 * 6 * 2) : 0);
  }

  return outResult;
}

function InputKey(keyIn, keyInOff, keyOutBuf, keyOutBufLen) {
  var tmpkey = new Uint8Array(32);
  var C = new Uint8Array(4);
  var D = new Uint8Array(4);
  var turns = 0;
  var i = 0;

  //console.log("keyInOff:" + keyInOff);
  Substitution(PC_1, 56, keyIn, keyInOff, tmpkey, 0);
  //console.log(des_hex(tmpkey, 32));

  for (turns = 0; turns < 16; turns++) {
    //memcpy(C, tmpkey, 4);
    //memcpy(D, &tmpkey[3], 4);
    for (i = 0; i < 4; i++) {
      C[i] = tmpkey[i];
      D[i] = tmpkey[i + 3];
    }

    D[0] <<= 4;
    D[0] &= 0xF0;
    D[0] |= ((D[1] >> 4) & 0x0F);

    D[1] <<= 4;
    D[1] &= 0xF0;
    D[1] |= ((D[2] >> 4) & 0x0F);

    D[2] <<= 4;
    D[2] &= 0xF0;
    D[2] |= ((D[3] >> 4) & 0x0F);

    D[3] <<= 4;
    D[3] &= 0xF0;

    LeftMove(C, Left_Move[turns]);
    LeftMove(D, Left_Move[turns]);

    //memcpy(tmpkey, C, 4);
    for (i = 0; i < 4; i++) {
      tmpkey[i] = C[i];
    }

    tmpkey[3] &= 0xF0;
    tmpkey[3] |= ((D[0] >> 4) & 0x0F);

    tmpkey[4] = (D[0] << 4) & 0xF0;
    tmpkey[4] |= ((D[1] >> 4) & 0x0F);

    tmpkey[5] = (D[1] << 4) & 0xF0;
    tmpkey[5] |= ((D[2] >> 4) & 0x0F);

    tmpkey[6] = (D[2] << 4) & 0xF0;
    tmpkey[6] |= ((D[3] >> 4) & 0x0F);

    //Substitution((unsigned char*)PC_2, 48, tmpkey, (unsigned char*)gTmpKey[turns]);
    Substitution(PC_2, 48,
      tmpkey, 0, keyOutBuf, keyOutBufLen + turns * 6);
  }

  //for (i = 0; i < 16 * 6; i++) {
  //console.log(i + " keybuf = %d",keyOutBuf[keyOutBufLen + i]);
  //}
}


function DesCode(lpIn, lpInIndex, lpOut, lpOutIndex,
  isEncrypt /*true:加密；false：解密*/ , keybuf, keybufIndex) {
  //unsigned char tmp[64];
  var tmp = new Uint8Array(64);
  //char L[4];
  var L = new Uint8Array(4);
  //char R[4];
  var R = new Uint8Array(4);
  //char KeepR[4];
  var KeepR = new Uint8Array(4);
  var i = 0;
  var j = 0;

  var turns = 0;
  var tmpchar = 0;

  Substitution(IP, 64, lpIn, lpInIndex, tmp, 0); /*IP置换*/

  //console.log(des_hex(tmp, 64));
  //memcpy(L, tmp, 4);
  //memcpy(R, &tmp[4], 4);
  for (i = 0; i < 4; i++) {
    L[i] = tmp[i];
    R[i] = tmp[i + 4];
  }

  if (isEncrypt) {
    turns = 0;
  } else {
    turns = 15;
  }

  while (true) {
    if (isEncrypt) {
      if (turns >= 16) {
        break;
      }
    } else {
      if (turns < 0) {
        break;
      }
    }
    //memcpy(KeepR, R, sizeof(R));
    for (i = 0; i < 4; i++) {
      KeepR[i] = R[i];
    }
    Substitution(Extern, 48, R, 0, tmp, 0);
    //console.log(des_hex(tmp, 64));
    //return;

    for (i = 0; i < 6; i++) {
      //tmp[i] = tmp[i] ^ gTmpKey[turns][i];
      tmp[i] = tmp[i] ^ keybuf[turns * 6 + i + keybufIndex];
    }
    //console.log(des_hex(tmp, 64));
    //return;


    /*S盒子计算*/
    for (i = 0; i < 8; i++) {
      /*8bit*6字节 转换成6bit*8字节*/
      tmpchar = tmp[parseInt(i * 6 / 8)];
      //console.log(parseInt(i * 6 / 8));
      //console.log("1:" + tmpchar);
      j = (i * 6) % 8;
      if (j > 2) {
        //两个字节
        tmpchar <<= (j - 2);
        tmpchar |= (tmp[parseInt(i * 6 / 8) + 1] >>> (10 - j));
        tmpchar &= 0x3F;
      } else {
        tmpchar >>>= (2 - j);
        tmpchar &= 0x3F;
      }
      //console.log("2:" + tmpchar);
      tmpchar |= ((tmpchar & 0x20) << 1);
      tmpchar &= (~0x20);
      tmpchar |= ((tmpchar & 0x01) << 5);
      tmpchar = (tmpchar >> 1) & 0x3F;
      //console.log("3:" + tmpchar);
      tmpchar = S_BOX[i * 64 + tmpchar];
      tmpchar &= 0x0F;
      //console.log("30:" + tmpchar);
      tmpchar = (tmpchar << (((i + 1) % 2) * 4));
      //console.log("4:" + tmpchar);
      tmp[parseInt(i / 2)] &= (0x0F << (((i) % 2) * 4));
      tmp[parseInt(i / 2)] |= tmpchar;
      //console.log(i + " tmp:" + tmp[parseInt(i / 2)]);
      //return;
    }
    //console.log(des_hex(tmp, 64));
    //return;
    Substitution(P, 32, tmp, 0, R, 0);

    for (j = 0; j < 4; j++) {
      R[j] ^= L[j]; /*异或运算*/
      L[j] = KeepR[j]; /*交换左右明文*/
    }

    /*合到一起*/
    //memcpy(tmp, L, sizeof(L));
    //memcpy(tmp + 4, R, sizeof(R));
    for (i = 0; i < 4; i++) {
      tmp[i] = L[i];
      tmp[i + 4] = R[i];
    }

    if (isEncrypt) {
      turns++;
    } else {
      turns--;
    }
  }

  for (i = 0; i < 4; i++) {
    tmpchar = tmp[4 + i];
    tmp[4 + i] = tmp[i];
    tmp[i] = tmpchar;
  }

  /*IP的逆置换*/
  Substitution(IP_1, 64, tmp, 0, lpOut, lpOutIndex);
}


module.exports = {
  des_init: des_init,
  des_encrypt: des_encrypt,
  des_decrypt: des_decrypt,
  des_str_to_array: des_str_to_array,
  des_hex_to_array: des_hex_to_array,
  des_hex_to_str: des_hex_to_str
}

测试代码：

如下在微信小程序中测试验证

var js_des = require('../../crypto/des.js');

testDes() {
  var desCtx = null;
  var result = null;

  desCtx = js_des.des_init(js_des.des_hex_to_array("0011223344556677"), 8);
  result = js_des.des_encrypt(desCtx, js_des.des_hex_to_array("1234567890ABCDEF"));
  console.log("8B key des encrypt:" + js_des.des_hex_to_str(result, 8));

  desCtx = js_des.des_init(js_des.des_hex_to_array("00112233445566778888888800000000"), 16);
  result = js_des.des_encrypt(desCtx, js_des.des_hex_to_array("1234567890ABCDEF"));
  console.log("16B key des encrypt:" + js_des.des_hex_to_str(result, 8));

  desCtx = js_des.des_init(js_des.des_hex_to_array("0011223344556677888888880000000088776655AABBCCDD"), 24);
  result = js_des.des_encrypt(desCtx, js_des.des_hex_to_array("1234567890ABCDEF"));
  console.log("24B key des encrypt:" + js_des.des_hex_to_str(result, 8));

  desCtx = js_des.des_init(js_des.des_hex_to_array("0011223344556677"), 8);
  result = js_des.des_decrypt(desCtx, js_des.des_hex_to_array("1234567890ABCDEF"));
  console.log("8B key des decrypt:" + js_des.des_hex_to_str(result, 8));

  desCtx = js_des.des_init(js_des.des_hex_to_array("00112233445566778888888800000000"), 16);
  result = js_des.des_decrypt(desCtx, js_des.des_hex_to_array("1234567890ABCDEF"));
  console.log("16B key des decrypt:" + js_des.des_hex_to_str(result, 8));

  desCtx = js_des.des_init(js_des.des_hex_to_array("0011223344556677888888880000000088776655AABBCCDD"), 24);
  result = js_des.des_decrypt(desCtx, js_des.des_hex_to_array("1234567890ABCDEF"));
  console.log("24B key des decrypt:" + js_des.des_hex_to_str(result, 8));
},

测试结果：

8B key des encrypt:dabbb1cc478bffcc
16B key des encrypt:7bf2b53fc58f4069
24B key des encrypt:b2c9dae93ca6eb4b
79 8B key des decrypt:52832babfbd22b03
83 16B key des decrypt:3ad46435585e6d07
87 24B key des decrypt:8ebbe81aee99048c

经其他工具验证，结果是正确的