JS标准DES加解密

DES算法的javascript实现

Javascript写的DES算法,目前只能使用8位的密钥.

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<title>DES算法-Code by 梅雪香</title>

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<!--

var DES = {

// initial permutation IP

IP_Table : [

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

// final permutation IP^-1

IPR_Table : [

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

// permuted choice table (key)

PC1_Table : [

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

// permuted choice key (table)

PC2_Table : [

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

// number left rotations of pc1

LOOP_Table : [1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1],

// expansion operation matrix

E_Table : [

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

// 32-bit permutation function P used on the output of the S-boxes

P_Table : [ 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 ],

// The (in)famous S-boxes

S_Box : [

// 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]]

Oct2Bin : ["0000","0001","0010","0011","0100","0101","0110","0111",

"1000","1001","1010","1011","1100","1101","1110","1111" ],

//str 为八位的字符

subKeys : new Array(16),

key : "",

text : ""

};

DES.init = function(key,text){

if(key != this.key){

this.key=key;

this.GenSubKey();

}

this.text= text + " ".substring(0,parseInt("07654321".charAt( text.length%8 ),10));

};

DES.GenSubKey = function(){

var arr = this.Permute( this.Byte2Bit(this.key) , this.PC1_Table);

var AL = arr.slice(0,28);

var AR = arr.slice(28,56);

for(var i=0; i<16; i++) {

for(var j=0,k=this.LOOP_Table[i];j<k;j++){

AL.push(AL.shift());

AR.push(AR.shift());

}

this.subKeys[i] = this.Permute( AL.concat(AR) , this.PC2_Table );

}

};

//数组ar存储二进制数据,该函数将从头开始的每八位转换成对应的字符

DES.Bit2Byte = function(ar,fCh){

var str="";

if(fCh == "byte"){

var tmpAr = ar.join("").match(/.{8}/g);

for(var i=0,j=tmpAr.length; i<j; i++)

str += String.fromCharCode(parseInt(tmpAr[i],2));

}

else if(fCh == "hex"){

var tmpAr = ar.join("").match(/.{4}/g);

for(var i=0,j=tmpAr.length; i<j; i++)

str += "0123456789abcdef".charAt(parseInt(tmpAr[i],2));

}

else return "Error:Second param is wrong.";

return str;

};

//将字符串转换成二进制数组

DES.Byte2Bit = function(str){

for(var i=0,j=8*str.length,ar = [],ch=""; i<j; i++){

var k = 7 - i%8;

if(k == 7) ch = str.charCodeAt(parseInt(i/8,10));

ar.push( (ch >> k) & 1 );

}

return ar;

};

//将16进制字符串转变成二进制数组

DES.Hex2Bin = function(str){

for(var i=0,j=str.length,s=""; i<j; i++)

s += this.Oct2Bin[ parseInt(str.charAt(i),16)];

return s.split("");

};

DES.Xor = function(A,B){

for(var i=0,j=B.length,rtn=new Array(j); i<j; i++)

rtn[i] = A[i] ^ B[i];

return rtn;

}

DES.Permute = function(ar,tb){

for(var i=0,j=tb.length,rtn=new Array(j);i<j;i++)

rtn[i] = ar[tb[i]-1];

return rtn;

};

DES.F_func = function(Ri,Ki)

{

return this.Permute( this.S_func( this.Xor( this.Permute( Ri , this.E_Table ) , Ki) ) , this.P_Table);

};

//ar为输入48位串数组

DES.S_func = function(ar){

for(var i=0,arRtn = [];i<8;i++){

var x = i*6;

var j = parseInt(""+ar[x]+ar[x+5],2);

var k = parseInt(ar.slice(x+1,x+5).join(""),2);

arRtn = arRtn.concat( this.Oct2Bin[ this.S_Box[i][j][k] ].split("") );

}

return arRtn;

}

//mode参数为处理模式."Encrypt":加密 "Decrypt":解密,默认为加密

DES.Encrypt = function(mode){

mode = mode?mode:"Encrypt";

if(mode=="Decrypt")

var plainTextAr = this.Hex2Bin(this.text).join("").match(/.{64}/g);

else

var plainTextAr = this.Byte2Bit(this.text).join("").match(/.{64}/g);

for(var i=0,j=plainTextAr.length;i<j;i++){

var arr = this.Permute(plainTextAr[i].split(""),this.IP_Table)

var AL = arr.slice(0,32);

var AR = arr.slice(32,64);

if(mode == "Decrypt"){

for(var k=15;k>-1;k--){

var tmp = AR.slice(0,32);

AR = this.Xor(this.F_func(AR,this.subKeys[k]) , AL);

AL = tmp;

}

else{

for(var k=0;k<16;k++){

var tmp = AR.slice(0,32);

AR = this.Xor(this.F_func(AR,this.subKeys[k]) , AL);

AL = tmp;

}

plainTextAr[i] = this.Bit2Byte(this.Permute(AR.concat(AL), this.IPR_Table),(mode=="Decrypt"?"byte":"hex"));

}

return plainTextAr.join("").trim();

}

String.prototype.trim = function(){ return this.replace(/\s+$/g,"");}

//-->

</script>

<!--

var $ = document.getElementById;

function jiami(){

DES.init($("txtKey").value,$("taText").value );

$("taCipher").value = DES.Encrypt();

}

function jiemi(){

DES.init($("txtKey").value,$("taCipher").value );

$("taText").value = DES.Encrypt("Decrypt");

}

//-->

</script>

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请输入加(解)密密钥:<input id="txtKey" type="text" onfocus="this.select()" value="47944980" size="10">

<font color="red">(*目前密钥只能是八位)</font><br>

未加密文本:<br>

<textarea id="taText">Hi,I'm meixuexiang.</textarea>

加密后文本:<br>

<p>code by meixx(<a href="http://www.blogjava.net/mxx">梅雪香</a>) 2006-10-18 23:00 <a href="mailto:wy_hd@163.com">信息反馈</a></p>

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http://www.blogjava.net/mxx/archive/2006/10/19/DES_in_Javascript.html