//des加解密函数
//key：加密用的密钥
//message：需要加密的字符串
//encrypt：加密还是解密，1为加密，0，解密
function des(key,message,encrypt,mode,iv){

 //declaring this locally speeds things up a bit
 var 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);
 var spfunction2=new Array(-0x7fef7fe0,-0x7fff8000,0x8000,0x108020,0x100000,0x20,-0x7fefffe0,-0x7fff7fe0,-0x7fffffe0,-0x7fef7fe0,-0x7fef8000,-0x80000000,-0x7fff8000,0x100000,0x20,-0x7fefffe0,0x108000,0x100020,-0x7fff7fe0,0,-0x80000000,0x8000,0x108020,-0x7ff00000,0x100020,-0x7fffffe0,0,0x108000,0x8020,-0x7fef8000,-0x7ff00000,0x8020,0,0x108020,-0x7fefffe0,0x100000,-0x7fff7fe0,-0x7ff00000,-0x7fef8000,0x8000,-0x7ff00000,-0x7fff8000,0x20,-0x7fef7fe0,0x108020,0x20,0x8000,-0x80000000,0x8020,-0x7fef8000,0x100000,-0x7fffffe0,0x100020,-0x7fff7fe0,-0x7fffffe0,0x100020,0x108000,0,-0x7fff8000,0x8020,-0x80000000,-0x7fefffe0,-0x7fef7fe0,0x108000);
 var 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);
 var 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);
 var 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);
 var 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);
 var 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);
 var 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);

 //create the 16 or 48 subkeys we will need
 var keys=des_createKeys(key);
 //window.alert( '好的'.charCodeAt(0) );
 var m=0,i,j,temp,temp2,right1,right2,left,right,looping;
 var cbcleft,cbcleft2,cbcright,cbcright2
 var endloop,loopinc;
 var len=message.length;
 var chunk=0;
 //set up the loops for single and triple des
 var iterations=keys.length==32?3 :9;//single or triple des
 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\0\0";//pad the message out with null bytes
 //store the result here
 result="";
 tempresult="";

 
 if(mode==1){//CBC mode 
 //alert(iv.charCodeAt(m++));
 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;
 }

 //loop through each 64 bit chunk of the message
 while(m<len){
 if(encrypt ){/*加密时按双字节操作*/
 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++);
 }
 //for Cipher Block Chaining mode,xor the message with the previous result
 if(mode==1){if(encrypt){left^=cbcleft;right^=cbcright;}else{cbcleft2=cbcleft;cbcright2=cbcright;cbcleft=left;cbcright=right;}}

 //first each 64 but chunk of the message must be permuted according to IP
 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));

 //do this either 1 or 3 times for each chunk of the message
 for(j=0;j<iterations;j+=3){
 endloop=looping[j+1];
 loopinc=looping[j+2];
 //now go through and perform the encryption or decryption
 for(i=looping[j];i!=endloop;i+=loopinc){//for efficiency
 right1=right^keys[i];
 right2=((right>>>4)|(right<<28))^keys[i+1];
 //the result is attained by passing these bytes through the S selection functions
 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;//unreverse left and right
 }//for either 1 or 3 iterations

 //move then each one bit to the right
 left=((left>>>1)|(left<<31));
 right=((right>>>1)|(right<<31));

 //now perform IP-1,which is IP in the opposite direction
 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);

 //for Cipher Block Chaining mode,xor the message with the previous result
 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));}/*解密时输出双字节*/
 encrypt?chunk+=16:chunk+=8;
 if(chunk==512){result+=tempresult;tempresult="";chunk=0;}
 }//for every 8 characters,or 64 bits in the message

 //return the result as an array
 return result+tempresult;
}//end of des

//des_createKeys
//this takes as input a 64 bit key(even though only 56 bits are used)
//as an array of 2 integers,and returns 16 48 bit keys
function des_createKeys(key){
 //declaring this locally speeds things up a bit
 pc2bytes0=new Array(0,0x4,0x20000000,0x20000004,0x10000,0x10004,0x20010000,0x20010004,0x200,0x204,0x20000200,0x20000204,0x10200,0x10204,0x20010200,0x20010204);
 pc2bytes1=new Array(0,0x1,0x100000,0x100001,0x4000000,0x4000001,0x4100000,0x4100001,0x100,0x101,0x100100,0x100101,0x4000100,0x4000101,0x4100100,0x4100101);
 pc2bytes2=new Array(0,0x8,0x800,0x808,0x1000000,0x1000008,0x1000800,0x1000808,0,0x8,0x800,0x808,0x1000000,0x1000008,0x1000800,0x1000808);
 pc2bytes3=new Array(0,0x200000,0x8000000,0x8200000,0x2000,0x202000,0x8002000,0x8202000,0x20000,0x220000,0x8020000,0x8220000,0x22000,0x222000,0x8022000,0x8222000);
 pc2bytes4=new Array(0,0x40000,0x10,0x40010,0,0x40000,0x10,0x40010,0x1000,0x41000,0x1010,0x41010,0x1000,0x41000,0x1010,0x41010);
 pc2bytes5=new Array(0,0x400,0x20,0x420,0,0x400,0x20,0x420,0x2000000,0x2000400,0x2000020,0x2000420,0x2000000,0x2000400,0x2000020,0x2000420);
 pc2bytes6=new Array(0,0x10000000,0x80000,0x10080000,0x2,0x10000002,0x80002,0x10080002,0,0x10000000,0x80000,0x10080000,0x2,0x10000002,0x80002,0x10080002);
 pc2bytes7=new Array(0,0x10000,0x800,0x10800,0x20000000,0x20010000,0x20000800,0x20010800,0x20000,0x30000,0x20800,0x30800,0x20020000,0x20030000,0x20020800,0x20030800);
 pc2bytes8=new Array(0,0x40000,0,0x40000,0x2,0x40002,0x2,0x40002,0x2000000,0x2040000,0x2000000,0x2040000,0x2000002,0x2040002,0x2000002,0x2040002);
 pc2bytes9=new Array(0,0x10000000,0x8,0x10000008,0,0x10000000,0x8,0x10000008,0x400,0x10000400,0x408,0x10000408,0x400,0x10000400,0x408,0x10000408);
 pc2bytes10=new Array(0,0x20,0,0x20,0x100000,0x100020,0x100000,0x100020,0x2000,0x2020,0x2000,0x2020,0x102000,0x102020,0x102000,0x102020);
 pc2bytes11=new Array(0,0x1000000,0x200,0x1000200,0x200000,0x1200000,0x200200,0x1200200,0x4000000,0x5000000,0x4000200,0x5000200,0x4200000,0x5200000,0x4200200,0x5200200);
 pc2bytes12=new Array(0,0x1000,0x8000000,0x8001000,0x80000,0x81000,0x8080000,0x8081000,0x10,0x1010,0x8000010,0x8001010,0x80010,0x81010,0x8080010,0x8081010);
 pc2bytes13=new Array(0,0x4,0x100,0x104,0,0x4,0x100,0x104,0x1,0x5,0x101,0x105,0x1,0x5,0x101,0x105);

 //how many iterations(1 for des,3 for triple des)
 var iterations=key.length>=24?3 :1;
 //stores the return keys
 var keys=new Array(32 * iterations);
 //now define the left shifts which need to be done
 var shifts=new Array(0,0,1,1,1,1,1,1,0,1,1,1,1,1,1,0);
 //other variables
 var lefttemp,righttemp,m=0,n=0,temp;

 for(var j=0;j<iterations;j++){//either 1 or 3 iterations
 left=(key.charCodeAt(m++)<<24)|(key.charCodeAt(m++)<<16)|(key.charCodeAt(m++)<<8)|key.charCodeAt(m++);
 right=(key.charCodeAt(m++)<<24)|(key.charCodeAt(m++)<<16)|(key.charCodeAt(m++)<<8)|key.charCodeAt(m++);

 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);

 //the right side needs to be shifted and to get the last four bits of the left side
 temp=(left<<8)|((right>>>20)&0x000000f0);
 //left needs to be put upside down
 left=(right<<24)|((right<<8)&0xff0000)|((right>>>8)&0xff00)|((right>>>24)&0xf0);
 right=temp;

 //now go through and perform these shifts on the left and right keys
 for(i=0;i<shifts.length;i++){
 //shift the keys either one or two bits to the left
 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;

 //now apply PC-2,in such a way that E is easier when encrypting or decrypting
 //this conversion will look like PC-2 except only the last 6 bits of each byte are used
 //rather than 48 consecutive bits and the order of lines will be according to
 //how the S selection functions will be applied:S2,S4,S6,S8,S1,S3,S5,S7
 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);
 }
 }//for each iterations
 //return the keys we"ve created
 return keys;
}//end of des_createKeys

////////////////////////////// 测试 //////////////////////////////

function stringToHex(s){
 var r="";
 var hexes=new Array("0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f");
 for(var i=0;i<(s.length);i++){r+=hexes[s.charCodeAt(i)>>4]+hexes[s.charCodeAt(i)&0xf];}
 return r;
}
function HexTostring(s){
 var r="";
 for(var i=0;i<s.length;i+=2){
 var sxx=parseInt(s.substring(i,i+2),16);
 r+=String.fromCharCode(sxx);}
 return r;
}



//加密(字符串，密钥) 返回加密后的字符串
function encMe(str,key){
var enstr =des(key,str,1,0);
return stringToHex(enstr);
}

//解密（要解密的字符串，密钥）返回解密后字符串
function uncMe(enstr, key){
return des(key,HexTostring(enstr),0,0);
}