Vincent found a code in public domain, created by John Walker, founder of AutoDesk, Inc and co-author of AutoCAD. Those functions allowed encryption of arbitrary text with AES 256. Vincent took that code and used it in a way which allowed Bloggers to embed the encrypted code in a blog post, then easily decrypt it with a click and a password. Thus the first version of his tweak was born.
Perhaps I should not be worried that this code will ever disappear, but I’ve seen my share of good ideas appearing and disappearing, hence I’d rather be safe than sorry. Here’s the code from the encrypt / decrypt page, linked below (you’ll have to open <head> and close </body> and </html> to use it).
/* <![CDATA[ */
var keySizeInBits=256;var blockSizeInBits=128;var roundsArray=[,,,,[,,,,10,,12,,
14],,[,,,,12,,12,,14],,[,,,,14,,14,,14]];var shiftOffsets=[,,,,[,1,2,3],,[,1,2,
3],,[,1,3,4]];var Rcon=[0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80,0x1b,0x36,0x6c,
0xd8,0xab,0x4d,0x9a,0x2f,0x5e,0xbc,0x63,0xc6,0x97,0x35,0x6a,0xd4,0xb3,0x7d,0xfa,
0xef,0xc5,0x91];var SBox=[99,124,119,123,242,107,111,197,48,1,103,43,254,215,171,
118,202,130,201,125,250,89,71,240,173,212,162,175,156,164,114,192,183,253,147,38,
54,63,247,204,52,165,229,241,113,216,49,21,4,199,35,195,24,150,5,154,7,18,128,
226,235,39,178,117,9,131,44,26,27,110,90,160,82,59,214,179,41,227,47,132,83,209,
0,237,32,252,177,91,106,203,190,57,74,76,88,207,208,239,170,251,67,77,51,133,69,
249,2,127,80,60,159,168,81,163,64,143,146,157,56,245,188,182,218,33,16,255,243,
210,205,12,19,236,95,151,68,23,196,167,126,61,100,93,25,115,96,129,79,220,34,42,
144,136,70,238,184,20,222,94,11,219,224,50,58,10,73,6,36,92,194,211,172,98,145,
149,228,121,231,200,55,109,141,213,78,169,108,86,244,234,101,122,174,8,186,120,
37,46,28,166,180,198,232,221,116,31,75,189,139,138,112,62,181,102,72,3,246,14,97,
53,87,185,134,193,29,158,225,248,152,17,105,217,142,148,155,30,135,233,206,85,40,
223,140,161,137,13,191,230,66,104,65,153,45,15,176,84,187,22];
var SBoxInverse=[82,9,106,213,48,54,165,56,191,64,163,158,129,243,215,251,124,
227,57,130,155,47,255,135,52,142,67,68,196,222,233,203,84,123,148,50,166,194,35,
61,238,76,149,11,66,250,195,78,8,46,161,102,40,217,36,178,118,91,162,73,109,139,
209,37,114,248,246,100,134,104,152,22,212,164,92,204,93,101,182,146,108,112,72,
80,253,237,185,218,94,21,70,87,167,141,157,132,144,216,171,0,140,188,211,10,247,
228,88,5,184,179,69,6,208,44,30,143,202,63,15,2,193,175,189,3,1,19,138,107,58,
145,17,65,79,103,220,234,151,242,207,206,240,180,230,115,150,172,116,34,231,173,
53,133,226,249,55,232,28,117,223,110,71,241,26,113,29,41,197,137,111,183,98,14,
170,24,190,27,252,86,62,75,198,210,121,32,154,219,192,254,120,205,90,244,31,221,
168,51,136,7,199,49,177,18,16,89,39,128,236,95,96,81,127,169,25,181,74,13,45,229,
122,159,147,201,156,239,160,224,59,77,174,42,245,176,200,235,187,60,131,83,153,
97,23,43,4,126,186,119,214,38,225,105,20,99,85,33,12,125];
function cyclicShiftLeft(theArray,positions){var temp=theArray.slice(0,positions)
;theArray=theArray.slice(positions).concat(temp);return theArray;}
var Nk=keySizeInBits/32;var Nb=blockSizeInBits/32;var Nr=roundsArray[Nk][Nb];
function xtime(poly){poly<<=1;return((poly&0x100)?(poly ^ 0x11B):(poly));}
function mult_GF256(x,y){var bit,result=0;for(bit=1;bit<256;bit*=2,y=xtime(y))
{if(x&bit)result ^=y;}return result;}function byteSub(state,direction){var S;
if(direction=="encrypt")S=SBox;else S=SBoxInverse;for(var i=0;i<4;i++)for(var j=0;
j<Nb;j++)state[i][j]=S[state[i][j]];}function shiftRow(state,direction)
{for(var i=1;i<4;i++)if(direction=="encrypt")state[i]=cyclicShiftLeft(state[i],
shiftOffsets[Nb][i]);else state[i]=cyclicShiftLeft(state[i],
Nb-shiftOffsets[Nb][i]);}function mixColumn(state,direction){var b=[];
for(var j=0;j<Nb;j++){for(var i=0;i<4;i++){if(direction=="encrypt")
b[i]=mult_GF256(state[i][j],2)^ mult_GF256(state[(i+1)%4][j],3)^ state[(i+2)
%4][j]^ state[(i+3)%4][j];else b[i]=mult_GF256(state[i][j],0xE)
^ mult_GF256(state[(i+1)%4][j],0xB)^ mult_GF256(state[(i+2)%4][j],0xD)
^ mult_GF256(state[(i+3)%4][j],9);}for(var i=0;i<4;i++)state[i][j]=b[i];}}
function addRoundKey(state,roundKey){for(var j=0;j<Nb;j++)
{state[0][j]^=(roundKey[j]&0xFF);state[1][j]^=((roundKey[j]>>8)&0xFF);
state[2][j]^=((roundKey[j]>>16)&0xFF);state[3][j]^=((roundKey[j]>>24)&0xFF);}}
function keyExpansion(key){var expandedKey=new Array();var temp;
Nk=keySizeInBits/32;Nb=blockSizeInBits/32;Nr=roundsArray[Nk][Nb];for(var j=0;
j<Nk;j++)expandedKey[j]=(key[4*j])|(key[4*j+1]<<8)|(key[4*j+2]<<16)
|(key[4*j+3]<<24);for(j=Nk;j<Nb*(Nr+1);j++){temp=expandedKey[j-1];if(j%Nk==0)
temp=((SBox[(temp>>8)&0xFF])|(SBox[(temp>>16)&0xFF]<<8)|(SBox[(temp>>24)
&0xFF]<<16)|(SBox[temp&0xFF]<<24))^ Rcon[Math.floor(j/Nk)-1];
else if(Nk>6&&j%Nk==4)temp=(SBox[(temp>>24)&0xFF]<<24)|(SBox[(temp>>16)
&0xFF]<<16)|(SBox[(temp>>8)&0xFF]<<8)|(SBox[temp&0xFF]);
expandedKey[j]=expandedKey[j-Nk]^ temp;}return expandedKey;}function Round(state,
roundKey){byteSub(state,"encrypt");shiftRow(state,"encrypt");mixColumn(state,"encrypt");
addRoundKey(state,roundKey);}function InverseRound(state,roundKey)
{addRoundKey(state,roundKey);mixColumn(state,"decrypt");shiftRow(state,"decrypt");
byteSub(state,"decrypt");}function FinalRound(state,roundKey){byteSub(state,"encrypt");
shiftRow(state,"encrypt");addRoundKey(state,roundKey);}
function InverseFinalRound(state,roundKey){addRoundKey(state,roundKey);
shiftRow(state,"decrypt");byteSub(state,"decrypt");}function encrypt(block,expandedKey)
{var i;if(!block||block.length*8!=blockSizeInBits)return;if(!expandedKey)return;
block=packBytes(block);addRoundKey(block,expandedKey);for(i=1;i<Nr;i++)
Round(block,expandedKey.slice(Nb*i,Nb*(i+1)));FinalRound(block,
expandedKey.slice(Nb*Nr));return unpackBytes(block);}function decryptOld(block,
expandedKey){var i;if(!block||block.length*8!=blockSizeInBits)return;
if(!expandedKey)return;block=packBytes(block);InverseFinalRound(block,
expandedKey.slice(Nb*Nr));for(i=Nr-1;i>0;i--)InverseRound(block,
expandedKey.slice(Nb*i,Nb*(i+1)));addRoundKey(block,expandedKey);
return unpackBytes(block);}function byteArrayToHex(byteArray){var result="";
if(!byteArray)return;for(var i=0;i<byteArray.length;i++)
result+=((byteArray[i]<16)?"0":"")+byteArray[i].toString(16);
return result;}function hexToByteArray(hexString){var byteArray=[];
if(hexString.length%2)return;if(hexString.indexOf("0x")
==0||hexString.indexOf("0X")==0)hexString=hexString.substring(2);for(var i=0;
i<hexString.length;i+=2)byteArray[Math.floor(i/2)]=parseInt(hexString.slice(i,
i+2),16);return byteArray;}function packBytes(octets){var state=new Array();
if(!octets||octets.length%4)return;state[0]=new Array();state[1]=new Array();
state[2]=new Array();state[3]=new Array();for(var j=0;j<octets.length;j+=4)
{state[0][j/4]=octets[j];state[1][j/4]=octets[j+1];state[2][j/4]=octets[j+2];
state[3][j/4]=octets[j+3];}return state;}function unpackBytes(packed)
{var result=new Array();for(var j=0;j<packed[0].length;j++)
{result[result.length]=packed[0][j];result[result.length]=packed[1][j];
result[result.length]=packed[2][j];result[result.length]=packed[3][j];}
return result;}function formatPlaintext(plaintext){var bpb=blockSizeInBits/8;
var i;if((!((typeof plaintext=="object")&&((typeof(plaintext[0]))=="number")))
&&((typeof plaintext=="string")||plaintext.indexOf))
{plaintext=plaintext.split("");for(i=0;i<plaintext.length;i++)
plaintext[i]=plaintext[i].charCodeAt(0)&0xFF;}i=plaintext.length%bpb;if(i>0)
{plaintext=plaintext.concat(getRandomBytes(bpb-i));}return plaintext;}
function getRandomBytes(howMany){var i,bytes=new Array();for(i=0;i<howMany;i++)
{bytes[i]=prng.nextInt(255);}return bytes;}function rijndaelEncrypt(plaintext,
key,mode){var expandedKey,i,aBlock;var bpb=blockSizeInBits/8;var ct;
if(!plaintext||!key)return;if(key.length*8!=keySizeInBits)return;if(mode=="CBC")
{ct=getRandomBytes(bpb);}else{mode="ECB";ct=new Array();}
plaintext=formatPlaintext(plaintext);expandedKey=keyExpansion(key);
for(var block=0;block<plaintext.length/bpb;block++)
{aBlock=plaintext.slice(block*bpb,(block+1)*bpb);if(mode=="CBC"){for(var i=0;
i<bpb;i++){aBlock[i]^=ct[(block*bpb)+i];}}ct=ct.concat(encrypt(aBlock,
expandedKey));}return ct;}function rijndaelDecrypt(ciphertext,key,mode)
{var expandedKey;var bpb=blockSizeInBits/8;var pt=new Array();var aBlock;
var block;if(!ciphertext||!key||typeof ciphertext=="string")return;
if(key.length*8!=keySizeInBits)return;if(!mode){mode="ECB";}
expandedKey=keyExpansion(key);for(block=(ciphertext.length/bpb)-1;block>0;
block--){aBlock=decryptOld(ciphertext.slice(block*bpb,(block+1)*bpb),expandedKey);
if(mode=="CBC")for(var i=0;i<bpb;i++)pt[(block-1)
*bpb+i]=aBlock[i]^ ciphertext[(block-1)*bpb+i];else pt=aBlock.concat(pt);}
if(mode=="ECB")pt=decryptOld(ciphertext.slice(0,bpb),expandedKey).concat(pt);
return pt;}
/* ]]> */
</script>
<script type="text/javascript" >
/* <![CDATA[ */
var entropyData=new Array();var edlen=0;addEntropyTime();ce();
function addEntropyByte(b){entropyData[edlen++]=b;}function ce()
{addEntropyByte(Math.floor((((new Date).getMilliseconds())*255)/999));}
function addEntropy32(w){var i;for(i=0;i<4;i++){addEntropyByte(w&0xFF);w>>=8;}}
function addEntropyTime(){addEntropy32((new Date()).getTime());}
var mouseMotionCollect=0;var oldMoveHandler;function mouseMotionEntropy(maxsamp)
{if(mouseMotionCollect<=0){mouseMotionCollect=maxsamp;
if((document.implementation.hasFeature("Events","2.0"))&&document.addEventListener)
{document.addEventListener("mousemove",mouseMoveEntropy,false);}
else{if(document.attachEvent){document.attachEvent("onmousemove",mouseMoveEntropy);}
else{oldMoveHandler=document.onmousemove;document.onmousemove=mouseMoveEntropy;}}
}}var mouseEntropyTime=0;function mouseMoveEntropy(e){if(!e){e=window.event;}
if(mouseMotionCollect>0){if(mouseEntropyTime--<=0){addEntropyByte(e.screenX&0xFF)
;addEntropyByte(e.screenY&0xFF);ce();mouseMotionCollect--;
mouseEntropyTime=(entropyData[edlen-3]^ entropyData[edlen-2]^ entropyData[edlen-1])
%19;}if(mouseMotionCollect<=0){if(document.removeEventListener)
{document.removeEventListener("mousemove",mouseMoveEntropy,false);}
else if(document.detachEvent){document.detachEvent("onmousemove",mouseMoveEntropy);}
else{document.onmousemove=oldMoveHandler;}}}}function keyFromEntropy(){var i,
k=new Array(32);if(edlen==0){alert("Blooie! Entropy vector void at call to keyFromEntropy.");}md5_init();for(i=0;i<edlen;i+=2)
{md5_update(entropyData[i]);}md5_finish();for(i=0;i<16;i++){k[i]=digestBits[i];}
md5_init();for(i=1;i<edlen;i+=2){md5_update(entropyData[i]);}md5_finish();
for(i=0;i<16;i++){k[i+16]=digestBits[i];}return k;}
/* ]]> */
</script>
<script type="text/javascript" >
/* <![CDATA[ */
function AESprng(seed){this.key=new Array();this.key=seed;
this.itext=hexToByteArray("9F489613248148F9C27945C6AE62EECA3E3367BB14064E4E6DC67A9F28AB3BD1");this.nbytes=0;this.next=AESprng_next;
this.nextbits=AESprng_nextbits;this.nextInt=AESprng_nextInt;
this.round=AESprng_round;bsb=blockSizeInBits;blockSizeInBits=256;var i,ct;
for(i=0;i<3;i++){this.key=rijndaelEncrypt(this.itext,this.key,"ECB");}
var n=1+(this.key[3]&2)+(this.key[9]&1);for(i=0;i<n;i++)
{this.key=rijndaelEncrypt(this.itext,this.key,"ECB");}blockSizeInBits=bsb;}
function AESprng_round(){bsb=blockSizeInBits;blockSizeInBits=256;
this.key=rijndaelEncrypt(this.itext,this.key,"ECB");this.nbytes=32;
blockSizeInBits=bsb;}function AESprng_next(){if(this.nbytes<=0){this.round();}
return(this.key[--this.nbytes]);}function AESprng_nextbits(n){var i,w=0,
nbytes=Math.floor((n+7)/8);for(i=0;i<nbytes;i++){w=(w<<8)|this.next();}
return w&((1<<n)-1);}function AESprng_nextInt(n){var p=1,nb=0;while(n>=p){p<<=1;
nb++;}p--;while(true){var v=this.nextbits(nb)&p;if(v<=n){return v;}}}
/* ]]> */
</script>
<script type="text/javascript" >
/* <![CDATA[ */
function uGen(old,a,q,r,m){var t;t=Math.floor(old/q);t=a*(old-(t*q))-(t*r);
return Math.round((t<0)?(t+m):t);}function LEnext(){var i;
this.gen1=uGen(this.gen1,40014,53668,12211,2147483563);this.gen2=uGen(this.gen2,
40692,52774,3791,2147483399);i=Math.floor(this.state/67108862);
this.state=Math.round((this.shuffle[i]+this.gen2)%2147483563);
this.shuffle[i]=this.gen1;return this.state;}function LEnint(n){var p=1;
while(n>=p){p<<=1;}p--;while(true){var v=this.next()&p;if(v<=n){return v;}}}
function LEcuyer(s){var i;this.shuffle=new Array(32);
this.gen1=this.gen2=(s&0x7FFFFFFF);for(i=0;i<19;i++){this.gen1=uGen(this.gen1,
40014,53668,12211,2147483563);}for(i=0;i<32;i++){this.gen1=uGen(this.gen1,40014,
53668,12211,2147483563);this.shuffle[31-i]=this.gen1;}this.state=this.shuffle[0];
this.next=LEnext;this.nextInt=LEnint;}
/* ]]> */
</script>
<script type="text/javascript" >
/* <![CDATA[ */
function array(n){for(i=0;i<n;i++){this[i]=0;}this.length=n;}function integer(n)
{return n%(0xffffffff+1);}function shr(a,b){a=integer(a);b=integer(b);
if(a-0x80000000>=0){a=a%0x80000000;a>>=b;a+=0x40000000>>(b-1);}else{a>>=b;}
return a;}function shl1(a){a=a%0x80000000;if(a&0x40000000==0x40000000)
{a-=0x40000000;a*=2;a+=0x80000000;}else{a*=2;}return a;}function shl(a,b)
{a=integer(a);b=integer(b);for(var i=0;i<b;i++){a=shl1(a);}return a;}
function and(a,b){a=integer(a);b=integer(b);var t1=a-0x80000000;
var t2=b-0x80000000;if(t1>=0){if(t2>=0){return((t1&t2)+0x80000000);}
else{return(t1&b);}}else{if(t2>=0){return(a&t2);}else{return(a&b);}}}
function or(a,b){a=integer(a);b=integer(b);var t1=a-0x80000000;
var t2=b-0x80000000;if(t1>=0){if(t2>=0){return((t1|t2)+0x80000000);}
else{return((t1|b)+0x80000000);}}else{if(t2>=0){return((a|t2)+0x80000000);}
else{return(a|b);}}}function xor(a,b){a=integer(a);b=integer(b);
var t1=a-0x80000000;var t2=b-0x80000000;if(t1>=0){if(t2>=0){return(t1 ^ t2);}
else{return((t1 ^ b)+0x80000000);}}else{if(t2>=0){return((a ^ t2)+0x80000000);}
else{return(a ^ b);}}}function not(a){a=integer(a);return 0xffffffff-a;}
var state=new array(4);var count=new array(2);count[0]=0;count[1]=0;
var buffer=new array(64);var transformBuffer=new array(16);
var digestBits=new array(16);var S11=7;var S12=12;var S13=17;var S14=22;
var S21=5;var S22=9;var S23=14;var S24=20;var S31=4;var S32=11;var S33=16;
var S34=23;var S41=6;var S42=10;var S43=15;var S44=21;function F(x,y,z)
{return or(and(x,y),and(not(x),z));}function G(x,y,z){return or(and(x,z),and(y,
not(z)));}function H(x,y,z){return xor(xor(x,y),z);}function I(x,y,z)
{return xor(y,or(x,not(z)));}function rotateLeft(a,n){return or(shl(a,n),(shr(a,
(32-n))));}function FF(a,b,c,d,x,s,ac){a=a+F(b,c,d)+x+ac;a=rotateLeft(a,s);a=a+b;
return a;}function GG(a,b,c,d,x,s,ac){a=a+G(b,c,d)+x+ac;a=rotateLeft(a,s);a=a+b;
return a;}function HH(a,b,c,d,x,s,ac){a=a+H(b,c,d)+x+ac;a=rotateLeft(a,s);a=a+b;
return a;}function II(a,b,c,d,x,s,ac){a=a+I(b,c,d)+x+ac;a=rotateLeft(a,s);a=a+b;
return a;}function transform(buf,offset){var a=0,b=0,c=0,d=0;
var x=transformBuffer;a=state[0];b=state[1];c=state[2];d=state[3];for(i=0;i<16;
i++){x[i]=and(buf[i*4+offset],0xFF);for(j=1;j<4;j++)
{x[i]+=shl(and(buf[i*4+j+offset],0xFF),j*8);}}a=FF(a,b,c,d,x[0],S11,0xd76aa478);
d=FF(d,a,b,c,x[1],S12,0xe8c7b756);c=FF(c,d,a,b,x[2],S13,0x242070db);b=FF(b,c,d,a,
x[3],S14,0xc1bdceee);a=FF(a,b,c,d,x[4],S11,0xf57c0faf);d=FF(d,a,b,c,x[5],S12,
0x4787c62a);c=FF(c,d,a,b,x[6],S13,0xa8304613);b=FF(b,c,d,a,x[7],S14,0xfd469501);
a=FF(a,b,c,d,x[8],S11,0x698098d8);d=FF(d,a,b,c,x[9],S12,0x8b44f7af);c=FF(c,d,a,b,
x[10],S13,0xffff5bb1);b=FF(b,c,d,a,x[11],S14,0x895cd7be);a=FF(a,b,c,d,x[12],S11,
0x6b901122);d=FF(d,a,b,c,x[13],S12,0xfd987193);c=FF(c,d,a,b,x[14],S13,0xa679438e)
;b=FF(b,c,d,a,x[15],S14,0x49b40821);a=GG(a,b,c,d,x[1],S21,0xf61e2562);d=GG(d,a,b,
c,x[6],S22,0xc040b340);c=GG(c,d,a,b,x[11],S23,0x265e5a51);b=GG(b,c,d,a,x[0],S24,
0xe9b6c7aa);a=GG(a,b,c,d,x[5],S21,0xd62f105d);d=GG(d,a,b,c,x[10],S22,0x2441453);
c=GG(c,d,a,b,x[15],S23,0xd8a1e681);b=GG(b,c,d,a,x[4],S24,0xe7d3fbc8);a=GG(a,b,c,
d,x[9],S21,0x21e1cde6);d=GG(d,a,b,c,x[14],S22,0xc33707d6);c=GG(c,d,a,b,x[3],S23,
0xf4d50d87);b=GG(b,c,d,a,x[8],S24,0x455a14ed);a=GG(a,b,c,d,x[13],S21,0xa9e3e905);
d=GG(d,a,b,c,x[2],S22,0xfcefa3f8);c=GG(c,d,a,b,x[7],S23,0x676f02d9);b=GG(b,c,d,a,
x[12],S24,0x8d2a4c8a);a=HH(a,b,c,d,x[5],S31,0xfffa3942);d=HH(d,a,b,c,x[8],S32,
0x8771f681);c=HH(c,d,a,b,x[11],S33,0x6d9d6122);b=HH(b,c,d,a,x[14],S34,0xfde5380c)
;a=HH(a,b,c,d,x[1],S31,0xa4beea44);d=HH(d,a,b,c,x[4],S32,0x4bdecfa9);c=HH(c,d,a,
b,x[7],S33,0xf6bb4b60);b=HH(b,c,d,a,x[10],S34,0xbebfbc70);a=HH(a,b,c,d,x[13],S31,
0x289b7ec6);d=HH(d,a,b,c,x[0],S32,0xeaa127fa);c=HH(c,d,a,b,x[3],S33,0xd4ef3085);
b=HH(b,c,d,a,x[6],S34,0x4881d05);a=HH(a,b,c,d,x[9],S31,0xd9d4d039);d=HH(d,a,b,c,
x[12],S32,0xe6db99e5);c=HH(c,d,a,b,x[15],S33,0x1fa27cf8);b=HH(b,c,d,a,x[2],S34,
0xc4ac5665);a=II(a,b,c,d,x[0],S41,0xf4292244);d=II(d,a,b,c,x[7],S42,0x432aff97);
c=II(c,d,a,b,x[14],S43,0xab9423a7);b=II(b,c,d,a,x[5],S44,0xfc93a039);a=II(a,b,c,
d,x[12],S41,0x655b59c3);d=II(d,a,b,c,x[3],S42,0x8f0ccc92);c=II(c,d,a,b,x[10],S43,
0xffeff47d);b=II(b,c,d,a,x[1],S44,0x85845dd1);a=II(a,b,c,d,x[8],S41,0x6fa87e4f);
d=II(d,a,b,c,x[15],S42,0xfe2ce6e0);c=II(c,d,a,b,x[6],S43,0xa3014314);b=II(b,c,d,
a,x[13],S44,0x4e0811a1);a=II(a,b,c,d,x[4],S41,0xf7537e82);d=II(d,a,b,c,x[11],S42,
0xbd3af235);c=II(c,d,a,b,x[2],S43,0x2ad7d2bb);b=II(b,c,d,a,x[9],S44,0xeb86d391);
state[0]+=a;state[1]+=b;state[2]+=c;state[3]+=d;}function md5_init()
{count[0]=count[1]=0;state[0]=0x67452301;state[1]=0xefcdab89;state[2]=0x98badcfe;
state[3]=0x10325476;for(i=0;i<digestBits.length;i++){digestBits[i]=0;}}
function md5_update(b){var index,i;index=and(shr(count[0],3),0x3F);
if(count[0]<0xFFFFFFFF-7){count[0]+=8;}else{count[1]++;count[0]-=0xFFFFFFFF+1;
count[0]+=8;}buffer[index]=and(b,0xff);if(index>=63){transform(buffer,0);}}
function md5_finish(){var bits=new array(8);var padding;var i=0,index=0,padLen=0;
for(i=0;i<4;i++){bits[i]=and(shr(count[0],(i*8)),0xFF);}for(i=0;i<4;i++)
{bits[i+4]=and(shr(count[1],(i*8)),0xFF);}index=and(shr(count[0],3),0x3F);
padLen=(index<56)?(56-index):(120-index);padding=new array(64);padding[0]=0x80;
for(i=0;i<padLen;i++){md5_update(padding[i]);}for(i=0;i<8;i++)
{md5_update(bits[i]);}for(i=0;i<4;i++){for(j=0;j<4;j++)
{digestBits[i*4+j]=and(shr(state[i],(j*8)),0xFF);}}}
/* ]]> */
</script>
<script type="text/javascript" >
/* <![CDATA[ */
var maxLineLength=50;var hexSentinel="?HX?",hexEndSentinel="?H";
function armour_hex(b){var h=hexSentinel+byteArrayToHex(b)+hexEndSentinel;
var t="";while(h.length>maxLineLength){t+=h.substring(0,maxLineLength)+"\n";
h=h.substring(maxLineLength,h.length);}t+=h+"\n";return t;}
function disarm_hex(s){var hexDigits="0123456789abcdefABCDEF";var hs="",i;
if((i=s.indexOf(hexSentinel))>=0){s=s.substring(i+hexSentinel.length,s.length);}
if((i=s.indexOf(hexEndSentinel))>=0){s=s.substring(0,i);}for(i=0;i<s.length;i++)
{var c=s.charAt(i);if(hexDigits.indexOf(c)>=0){hs+=c;}}return hexToByteArray(hs);
}var acgcl,acgt,acgg;function armour_cg_outgroup(){if(acgcl.length>maxLineLength)
{acgt+=acgcl+"\n";acgcl="";}if(acgcl.length>0){acgcl+=" ";}acgcl+=acgg;
acgg="";}function armour_cg_outletter(l){if(acgg.length>=5)
{armour_cg_outgroup();}acgg+=l;}var codegroupSentinel="ZZZZZ";
function armour_codegroup(b){var charBase=("A").charCodeAt(0);
acgcl=codegroupSentinel;acgt="";acgg="";var cgrng=new LEcuyer(0xbadf00d);
for(i=0;i<b.length;i++){var r=cgrng.nextInt(23);
armour_cg_outletter(String.fromCharCode(charBase+((((b[i]>>4)&0xF))+r)%24));
r=cgrng.nextInt(23);
armour_cg_outletter(String.fromCharCode(charBase+((((b[i]&0xF))+r)%24)));}
delete cgrng;while(acgg.length<5){armour_cg_outletter("Z");}
armour_cg_outgroup();acgg="YYYYY";armour_cg_outgroup();acgt+=acgcl+"\n";
return acgt;}var dcgs,dcgi;function disarm_cg_insig(){while(dcgi<dcgs.length)
{var c=dcgs.charAt(dcgi++).toUpperCase();if((c>="A")&&(c<="Z")){return c;}}
return "";}function disarm_codegroup(s){var b=new Array();var nz=0,ba,bal=0,
c;dcgs=s;dcgi=0;while(nz<5){c=disarm_cg_insig();if(c=="Z"){nz++;}
else if(c==""){nz=0;break;}else{nz=0;}}if(nz==0){alert("No codegroup starting symbol found in message.");return "";
}var charBase=("A").charCodeAt(0);var cgrng=new LEcuyer(0xbadf00d);for(nz=0;
nz<2;){c=disarm_cg_insig();if((c=="Y")||(c=="")){break;}else if(c!="Z")
{var r=cgrng.nextInt(23);var n=c.charCodeAt(0)-charBase;n=(n+(24-r))%24;if(nz==0)
{ba=(n<<4);nz++;}else{ba|=n;b[bal++]=ba;nz=0;}}}delete cgrng;var kbo=" Attempting decoding with data received.";
if(nz!=0){alert("Codegroup data truncated."+kbo);}else{if(c=="Y"){nz=1;while(nz<5)
{c=disarm_cg_insig();if(c!="Y"){break;}nz++;}if(nz!=5){alert("Codegroup end group incomplete."+kbo);}}
else{alert("Codegroup end group missing."+kbo);}}return b;}var base64code="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/",base64sent="?b64",
base64esent="?64b",base64addsent=false;function armour_base64(b){var b64t="";
var b64l=base64addsent?base64sent:"";var i;for(i=0;i<=b.length-3;i+=3)
{if((b64l.length+4)>maxLineLength){b64t+=b64l+lineBreak;b64l="";}
b64l+=base64code.charAt(b[i]>>2);b64l+=base64code.charAt(((b[i]&3)<<4)
|(b[i+1]>>4));b64l+=base64code.charAt(((b[i+1]&0xF)<<2)|(b[i+2]>>6));
b64l+=base64code.charAt(b[i+2]&0x3F);}if((b.length-i)==1)
{b64l+=base64code.charAt(b[i]>>2);b64l+=base64code.charAt(((b[i]&3)<<4));
b64l+="==";}else if((b.length-i)==2){b64l+=base64code.charAt(b[i]>>2);
b64l+=base64code.charAt(((b[i]&3)<<4)|(b[i+1]>>4));
b64l+=base64code.charAt(((b[i+1]&0xF)<<2));b64l+="=";}if((b64l.length+4)
>maxLineLength){b64t+=b64l+"\n";b64l="";}if(base64addsent)
{b64l+=base64esent;}b64t+=b64l+"\n";return b64t;}function disarm_base64(s)
{var b=new Array();var i=0,j,c,shortgroup=0,n=0;var d=new Array();
if((j=s.indexOf(base64sent))>=0){s=s.substring(j+base64sent.length,s.length);}
if((j=s.indexOf(base64esent))>=0){s=s.substring(0,j);}while(i<s.length)
{if(base64code.indexOf(s.charAt(i))!=-1){break;}i++;}while(i<s.length){for(j=0;
j<4;){if(i>=s.length){if(j>0){alert("Base64 cipher text truncated.");return b;}break;}
c=base64code.indexOf(s.charAt(i));if(c>=0){d[j++]=c;}else if(s.charAt(i)=="=")
{d[j++]=0;shortgroup++;}else if(s.substring(i,i+base64esent.length)==base64esent)
{i=s.length;continue;}else{}i++;}if(j==4){b[n++]=((d[0]<<2)|(d[1]>>4))&0xFF;
if(shortgroup<2){b[n++]=((d[1]<<4)|(d[2]>>2))&0xFF;if(shortgroup<1)
{b[n++]=((d[2]<<6)|d[3])&0xFF;}}}}return b;}
/* ]]> */
</script>
<script type="text/javascript" >
/* <![CDATA[ */
function unicode_to_utf8(s){var utf8="";for(var n=0;n<s.length;n++)
{var c=s.charCodeAt(n);if(c<=0x7F){utf8+=String.fromCharCode(c);}
else if((c>=0x80)&&(c<=0x7FF)){utf8+=String.fromCharCode((c>>6)|0xC0);
utf8+=String.fromCharCode((c&0x3F)|0x80);}else{utf8+=String.fromCharCode((c>>12)
|0xE0);utf8+=String.fromCharCode(((c>>6)&0x3F)|0x80);
utf8+=String.fromCharCode((c&0x3F)|0x80);}}return utf8;}
function utf8_to_unicode(utf8){var s="",i=0,b1,b2,b2;while(i<utf8.length)
{b1=utf8.charCodeAt(i);if(b1<0x80){s+=String.fromCharCode(b1);i++;}
else if((b1>=0xC0)&&(b1<0xE0)){b2=utf8.charCodeAt(i+1);
s+=String.fromCharCode(((b1&0x1F)<<6)|(b2&0x3F));i+=2;}
else{b2=utf8.charCodeAt(i+1);b3=utf8.charCodeAt(i+2);
s+=String.fromCharCode(((b1&0xF)<<12)|((b2&0x3F)<<6)|(b3&0x3F));i+=3;}}return s;}
function encode_utf8(s){var i,necessary=false;for(i=0;i<s.length;i++)
{if((s.charCodeAt(i)==0x9D)||(s.charCodeAt(i)>0xFF)){necessary=true;break;}}
if(!necessary){return s;}return String.fromCharCode(0x9D)+unicode_to_utf8(s);}
function decode_utf8(s){if((s.length>0)&&(s.charCodeAt(0)==0x9D))
{return utf8_to_unicode(s.substring(1));}return s;}
/* ]]> */
</script>
<script type="text/javascript" >
/* <![CDATA[ */
var loadTime=(new Date()).getTime();var key;var prng;function setKey()
{var s=encode_utf8(document.key.text.value);
var i,kmd5e,kmd5o;if(s.length==1){s+=s;}md5_init();for(i=0;i<s.length;i+=2)
{md5_update(s.charCodeAt(i));}md5_finish();kmd5e=byteArrayToHex(digestBits);
md5_init();for(i=1;i<s.length;i+=2){md5_update(s.charCodeAt(i));}md5_finish();
kmd5o=byteArrayToHex(digestBits);var hs=kmd5e+kmd5o;key=hexToByteArray(hs);
hs=byteArrayToHex(key);}function Generate_key(){var i,j,k="";
var i,j,k="";addEntropyTime();var seed=keyFromEntropy();
var prng=new AESprng(seed);var charA=("A")
.charCodeAt(0);for(i=0;i<12;i++){if(i>0){k+="-";}for(j=0;j<5;j++)
{k+=String.fromCharCode(charA+prng.nextInt(25));}}
document.key.text.value=k;delete prng;}function Encrypt_text(){var v,i;
if(document.key.text.value.length==0)
{alert("Please specify a key with which to encrypt the message.");return;}if(document.plain.text.value.length==0){alert("No plain text to encrypt! Please enter or paste plain text in the field above.");
return;}
maxLineLength = document.plain.maxLineLength.value;
lineBreak = "";
if (document.plain.EOL[1].checked)
lineBreak = "<br />";
else if (document.plain.EOL[2].checked)
lineBreak = "\\n";
if (!document.plain.singleLine.checked)
lineBreak += "\n";
document.cipher.text.value="";setKey();addEntropyTime();
prng=new AESprng(keyFromEntropy());
var plaintext=encode_utf8(document.plain.text.value);md5_init();for(i=0;
i<plaintext.length;i++){md5_update(plaintext.charCodeAt(i));}md5_finish();
var header="";for(i=0;i<digestBits.length;i++)
{header+=String.fromCharCode(digestBits[i]);}i=plaintext.length;
header+=String.fromCharCode(i>>>24);header+=String.fromCharCode(i>>>16);
header+=String.fromCharCode(i>>>8);header+=String.fromCharCode(i&0xFF);
var ct=rijndaelEncrypt(header+plaintext,key,"CBC");
v=armour_base64(ct);
document.cipher.text.value=v;delete prng;}
function Decrypt_text(){if(document.key.text.value.length==0){alert("Please specify a key with which to decrypt the message.");
return;}if(document.cipher.text.value.length==0){alert("No cipher text to decrypt! Please enter or paste cipher text in the field above.");return;}
//document.plain.text.value="";
setKey();var ct=new Array();
ct=disarm_base64(document.cipher.text.value.replace(/<br>/gi, "").replace(/<br \/>/gi, "").replace(/\\n/gi, ""));
var result=rijndaelDecrypt(ct,key,"CBC");var header=result.slice(0,20);result=result.slice(20);
var dl=(header[16]<<24)|(header[17]<<16)|(header[18]<<8)|header[19];if((dl<0)
||(dl>result.length)){//alert("Message (length "+result.length+") truncated. "+dl+" characters expected.");
dl=result.length;}var i,plaintext="";md5_init();for(i=0;i<dl;i++)
{plaintext+=String.fromCharCode(result[i]);md5_update(result[i]);}md5_finish();successful = true;
for(i=0;i<digestBits.length;i++){if(digestBits[i]!=header[i]){alert("Invalid decryption key.");successful = false;
break;}}
if (successful) {
//document.plain.text.value=decode_utf8(plaintext);
document.plain.text.value=decode_utf8(plaintext.replace(/\n/g,'<br \/>'));
}}
/* ]]> */
</script>
<script type="text/javascript" language="JavaScript">
<!--
// Our onLoad handler kicks off the collection of entropy
function nowLoaded() {
ce(); // Add time we got here to entropy
mouseMotionEntropy(60); // Initialise collection of mouse motion entropy
}
// -->
</script>
<style type="text/css">
#content h3 {
text-align: center;
line-height: 100%;
padding-bottom: 0.5em;
}
#content p {
padding-top: 0;
}
#content form {
padding-bottom: 2em;
}
</style>
<script type="text/javascript">
window.google_analytics_uacct = "UA-52818-5";
</script>
</head>
<body onload="nowLoaded()">
<div id="container">
<div id="content-top"></div>
<div id="content" style="position: relative">
<h1>JavaScript Encryption and Decryption 1.0</h1>
<center>
<script type="text/javascript"><!--
google_ad_client = "pub-7462837650533262";
/* 728x90 */
google_ad_slot = "9226555238";
google_ad_width = 728;
google_ad_height = 90;
//-->
</script>
<script type="text/javascript"
src="http://pagead2.googlesyndication.com/pagead/show_ads.js">
</script>
</center>
<!-- <hr style="background-color: rgb(192, 192, 192); color: #000000;" /> //-->
<form name="key" action="#" onsubmit="return false;">
<h3 style="margin-top: 0; padding-top: 0;">Key</h3>
<p align="center">
<input type="text" name="text" id="passwordText" onfocus="ce();" onblur="ce();" onkeydown="ce();" />
<br />
<input type="button" value=" Generate " onclick="Generate_key();" />
<input type="button" value=" Clear " onclick="document.key.text.value = '';" />
<input type="button" value=" Select " onclick="document.key.text.select();" />
</p>
</form>
<form name="plain" action="#" onsubmit="return false;">
<h3>Plain Text</h3>
<p align="center">
<textarea name="text" id="plainText" rows="10" onfocus="ce();" onblur="ce();" onkeydown="ce();"></textarea>
<br />
<input type="button" name="encrypt" value=" Encrypt " onclick="Encrypt_text();" />
<input type="button" value=" Clear " onclick="document.plain.text.value = '';" />
<input type="button" value=" Select " onclick="document.plain.text.select();" />
<br /><br />
Maximum line length:
<input type="text" name="maxLineLength" size="10" maxlength="4" value="50" />
<br />
<center>
<table style="margin-top: 1em; border: 1px solid gray">
<tr valign="top">
<td style="padding: 1em">
<b>Presets</b><br />
<input type="radio" name="Preset" value="hide" checked onclick="javascript:document.plain.EOL[2].checked=true;document.plain.singleLine.checked=true;"> Hide encrypted text<br />
<input type="radio" name="Preset" value="show" onclick="javascript:document.plain.EOL[0].checked=true;plain.singleLine.checked=false;"> Show encrypted text<br />
<input type="radio" name="Preset" value="custom"> Custom<br />
</td>
<td style="padding: 1em; border-left: 1px solid gray">
<b>End of line characters</b><br />
<input type="radio" name="EOL" value="none" onclick="javascript:document.plain.Preset[2].checked=true;"> None<br />
<input type="radio" name="EOL" value="breakTag" onclick="javascript:document.plain.Preset[2].checked=true;"> HTML line break<br />
<input type="radio" name="EOL" value="eolCharacter" checked onclick="javascript:document.plain.Preset[2].checked=true;"> Newline character<br />
<br />
<input type="checkbox" name="singleLine" checked onclick="javascript:document.plain.Preset[2].checked=true;"> Display as a single line
</td>
</tr>
</table>
</center>
</p>
</form>
<form name="cipher" action="#" onsubmit="return false;">
<h3>Cipher Text</h3>
<p align="center">
<textarea name="text" id="cipherText" rows="10" onfocus="ce();" onblur="ce();" onkeydown="ce();"></textarea>
<br />
<input type="button" name="decrypt" value=" Decrypt " onclick="Decrypt_text();" />
<input type="button" value=" Clear " onclick="document.cipher.text.value = '';" />
<input type="button" value=" Select " onclick="document.cipher.text.select();" />
</p>
</form>
The JavaScript file that needs to be included in the Header of your template (Layout) is
/*
Cryptography Javascript code written by John Walker (http://www.fourmilab.ch/javascrypt/).
Modified by Vincent Cheung (http://veenix.blogspot.com/)
July 17, 2006
*/
/* <![CDATA[ */
var keySizeInBits=256;var blockSizeInBits=128;var roundsArray=[,,,,[,,,,10,,12,,
14],,[,,,,12,,12,,14],,[,,,,14,,14,,14]];var shiftOffsets=[,,,,[,1,2,3],,[,1,2,
3],,[,1,3,4]];var Rcon=[0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80,0x1b,0x36,0x6c,
0xd8,0xab,0x4d,0x9a,0x2f,0x5e,0xbc,0x63,0xc6,0x97,0x35,0x6a,0xd4,0xb3,0x7d,0xfa,
0xef,0xc5,0x91];var SBox=[99,124,119,123,242,107,111,197,48,1,103,43,254,215,171,
118,202,130,201,125,250,89,71,240,173,212,162,175,156,164,114,192,183,253,147,38,
54,63,247,204,52,165,229,241,113,216,49,21,4,199,35,195,24,150,5,154,7,18,128,
226,235,39,178,117,9,131,44,26,27,110,90,160,82,59,214,179,41,227,47,132,83,209,
0,237,32,252,177,91,106,203,190,57,74,76,88,207,208,239,170,251,67,77,51,133,69,
249,2,127,80,60,159,168,81,163,64,143,146,157,56,245,188,182,218,33,16,255,243,
210,205,12,19,236,95,151,68,23,196,167,126,61,100,93,25,115,96,129,79,220,34,42,
144,136,70,238,184,20,222,94,11,219,224,50,58,10,73,6,36,92,194,211,172,98,145,
149,228,121,231,200,55,109,141,213,78,169,108,86,244,234,101,122,174,8,186,120,
37,46,28,166,180,198,232,221,116,31,75,189,139,138,112,62,181,102,72,3,246,14,97,
53,87,185,134,193,29,158,225,248,152,17,105,217,142,148,155,30,135,233,206,85,40,
223,140,161,137,13,191,230,66,104,65,153,45,15,176,84,187,22];
var SBoxInverse=[82,9,106,213,48,54,165,56,191,64,163,158,129,243,215,251,124,
227,57,130,155,47,255,135,52,142,67,68,196,222,233,203,84,123,148,50,166,194,35,
61,238,76,149,11,66,250,195,78,8,46,161,102,40,217,36,178,118,91,162,73,109,139,
209,37,114,248,246,100,134,104,152,22,212,164,92,204,93,101,182,146,108,112,72,
80,253,237,185,218,94,21,70,87,167,141,157,132,144,216,171,0,140,188,211,10,247,
228,88,5,184,179,69,6,208,44,30,143,202,63,15,2,193,175,189,3,1,19,138,107,58,
145,17,65,79,103,220,234,151,242,207,206,240,180,230,115,150,172,116,34,231,173,
53,133,226,249,55,232,28,117,223,110,71,241,26,113,29,41,197,137,111,183,98,14,
170,24,190,27,252,86,62,75,198,210,121,32,154,219,192,254,120,205,90,244,31,221,
168,51,136,7,199,49,177,18,16,89,39,128,236,95,96,81,127,169,25,181,74,13,45,229,
122,159,147,201,156,239,160,224,59,77,174,42,245,176,200,235,187,60,131,83,153,
97,23,43,4,126,186,119,214,38,225,105,20,99,85,33,12,125];
function cyclicShiftLeft(theArray,positions){var temp=theArray.slice(0,positions)
;theArray=theArray.slice(positions).concat(temp);return theArray;}
var Nk=keySizeInBits/32;var Nb=blockSizeInBits/32;var Nr=roundsArray[Nk][Nb];
function xtime(poly){poly<<=1;return((poly&0x100)?(poly ^ 0x11B):(poly));}
function mult_GF256(x,y){var bit,result=0;for(bit=1;bit<256;bit*=2,y=xtime(y))
{if(x&bit)result ^=y;}return result;}function byteSub(state,direction){var S;
if(direction=="encrypt")S=SBox;else S=SBoxInverse;for(var i=0;i<4;i++)for(var j=0;
j<Nb;j++)state[i][j]=S[state[i][j]];}function shiftRow(state,direction)
{for(var i=1;i<4;i++)if(direction=="encrypt")state[i]=cyclicShiftLeft(state[i],
shiftOffsets[Nb][i]);else state[i]=cyclicShiftLeft(state[i],
Nb-shiftOffsets[Nb][i]);}function mixColumn(state,direction){var b=[];
for(var j=0;j<Nb;j++){for(var i=0;i<4;i++){if(direction=="encrypt")
b[i]=mult_GF256(state[i][j],2)^ mult_GF256(state[(i+1)%4][j],3)^ state[(i+2)
%4][j]^ state[(i+3)%4][j];else b[i]=mult_GF256(state[i][j],0xE)
^ mult_GF256(state[(i+1)%4][j],0xB)^ mult_GF256(state[(i+2)%4][j],0xD)
^ mult_GF256(state[(i+3)%4][j],9);}for(var i=0;i<4;i++)state[i][j]=b[i];}}
function addRoundKey(state,roundKey){for(var j=0;j<Nb;j++)
{state[0][j]^=(roundKey[j]&0xFF);state[1][j]^=((roundKey[j]>>8)&0xFF);
state[2][j]^=((roundKey[j]>>16)&0xFF);state[3][j]^=((roundKey[j]>>24)&0xFF);}}
function keyExpansion(key){var expandedKey=new Array();var temp;
Nk=keySizeInBits/32;Nb=blockSizeInBits/32;Nr=roundsArray[Nk][Nb];for(var j=0;
j<Nk;j++)expandedKey[j]=(key[4*j])|(key[4*j+1]<<8)|(key[4*j+2]<<16)
|(key[4*j+3]<<24);for(j=Nk;j<Nb*(Nr+1);j++){temp=expandedKey[j-1];if(j%Nk==0)
temp=((SBox[(temp>>8)&0xFF])|(SBox[(temp>>16)&0xFF]<<8)|(SBox[(temp>>24)
&0xFF]<<16)|(SBox[temp&0xFF]<<24))^ Rcon[Math.floor(j/Nk)-1];
else if(Nk>6&&j%Nk==4)temp=(SBox[(temp>>24)&0xFF]<<24)|(SBox[(temp>>16)
&0xFF]<<16)|(SBox[(temp>>8)&0xFF]<<8)|(SBox[temp&0xFF]);
expandedKey[j]=expandedKey[j-Nk]^ temp;}return expandedKey;}function Round(state,
roundKey){byteSub(state,"encrypt");shiftRow(state,"encrypt");mixColumn(state,"encrypt");
addRoundKey(state,roundKey);}function InverseRound(state,roundKey)
{addRoundKey(state,roundKey);mixColumn(state,"decrypt");shiftRow(state,"decrypt");
byteSub(state,"decrypt");}function FinalRound(state,roundKey){byteSub(state,"encrypt");
shiftRow(state,"encrypt");addRoundKey(state,roundKey);}
function InverseFinalRound(state,roundKey){addRoundKey(state,roundKey);
shiftRow(state,"decrypt");byteSub(state,"decrypt");}function encrypt(block,expandedKey)
{var i;if(!block||block.length*8!=blockSizeInBits)return;if(!expandedKey)return;
block=packBytes(block);addRoundKey(block,expandedKey);for(i=1;i<Nr;i++)
Round(block,expandedKey.slice(Nb*i,Nb*(i+1)));FinalRound(block,
expandedKey.slice(Nb*Nr));return unpackBytes(block);}function decryptOld(block,
expandedKey){var i;if(!block||block.length*8!=blockSizeInBits)return;
if(!expandedKey)return;block=packBytes(block);InverseFinalRound(block,
expandedKey.slice(Nb*Nr));for(i=Nr-1;i>0;i--)InverseRound(block,
expandedKey.slice(Nb*i,Nb*(i+1)));addRoundKey(block,expandedKey);
return unpackBytes(block);}function byteArrayToHex(byteArray){var result="";
if(!byteArray)return;for(var i=0;i<byteArray.length;i++)
result+=((byteArray[i]<16)?"0":"")+byteArray[i].toString(16);
return result;}function hexToByteArray(hexString){var byteArray=[];
if(hexString.length%2)return;if(hexString.indexOf("0x")
==0||hexString.indexOf("0X")==0)hexString=hexString.substring(2);for(var i=0;
i<hexString.length;i+=2)byteArray[Math.floor(i/2)]=parseInt(hexString.slice(i,
i+2),16);return byteArray;}function packBytes(octets){var state=new Array();
if(!octets||octets.length%4)return;state[0]=new Array();state[1]=new Array();
state[2]=new Array();state[3]=new Array();for(var j=0;j<octets.length;j+=4)
{state[0][j/4]=octets[j];state[1][j/4]=octets[j+1];state[2][j/4]=octets[j+2];
state[3][j/4]=octets[j+3];}return state;}function unpackBytes(packed)
{var result=new Array();for(var j=0;j<packed[0].length;j++)
{result[result.length]=packed[0][j];result[result.length]=packed[1][j];
result[result.length]=packed[2][j];result[result.length]=packed[3][j];}
return result;}function formatPlaintext(plaintext){var bpb=blockSizeInBits/8;
var i;if((!((typeof plaintext=="object")&&((typeof(plaintext[0]))=="number")))
&&((typeof plaintext=="string")||plaintext.indexOf))
{plaintext=plaintext.split("");for(i=0;i<plaintext.length;i++)
plaintext[i]=plaintext[i].charCodeAt(0)&0xFF;}i=plaintext.length%bpb;if(i>0)
{plaintext=plaintext.concat(getRandomBytes(bpb-i));}return plaintext;}
function getRandomBytes(howMany){var i,bytes=new Array();for(i=0;i<howMany;i++)
{bytes[i]=prng.nextInt(255);}return bytes;}function rijndaelEncrypt(plaintext,
key,mode){var expandedKey,i,aBlock;var bpb=blockSizeInBits/8;var ct;
if(!plaintext||!key)return;if(key.length*8!=keySizeInBits)return;if(mode=="CBC")
{ct=getRandomBytes(bpb);}else{mode="ECB";ct=new Array();}
plaintext=formatPlaintext(plaintext);expandedKey=keyExpansion(key);
for(var block=0;block<plaintext.length/bpb;block++)
{aBlock=plaintext.slice(block*bpb,(block+1)*bpb);if(mode=="CBC"){for(var i=0;
i<bpb;i++){aBlock[i]^=ct[(block*bpb)+i];}}ct=ct.concat(encrypt(aBlock,
expandedKey));}return ct;}function rijndaelDecrypt(ciphertext,key,mode)
{var expandedKey;var bpb=blockSizeInBits/8;var pt=new Array();var aBlock;
var block;if(!ciphertext||!key||typeof ciphertext=="string")return;
if(key.length*8!=keySizeInBits)return;if(!mode){mode="ECB";}
expandedKey=keyExpansion(key);for(block=(ciphertext.length/bpb)-1;block>0;
block--){aBlock=decryptOld(ciphertext.slice(block*bpb,(block+1)*bpb),expandedKey);
if(mode=="CBC")for(var i=0;i<bpb;i++)pt[(block-1)
*bpb+i]=aBlock[i]^ ciphertext[(block-1)*bpb+i];else pt=aBlock.concat(pt);}
if(mode=="ECB")pt=decryptOld(ciphertext.slice(0,bpb),expandedKey).concat(pt);
return pt;}
/* ]]> */
/* <![CDATA[ */
function array(n){for(i=0;i<n;i++){this[i]=0;}this.length=n;}function integer(n)
{return n%(0xffffffff+1);}function shr(a,b){a=integer(a);b=integer(b);
if(a-0x80000000>=0){a=a%0x80000000;a>>=b;a+=0x40000000>>(b-1);}else{a>>=b;}
return a;}function shl1(a){a=a%0x80000000;if(a&0x40000000==0x40000000)
{a-=0x40000000;a*=2;a+=0x80000000;}else{a*=2;}return a;}function shl(a,b)
{a=integer(a);b=integer(b);for(var i=0;i<b;i++){a=shl1(a);}return a;}
function and(a,b){a=integer(a);b=integer(b);var t1=a-0x80000000;
var t2=b-0x80000000;if(t1>=0){if(t2>=0){return((t1&t2)+0x80000000);}
else{return(t1&b);}}else{if(t2>=0){return(a&t2);}else{return(a&b);}}}
function or(a,b){a=integer(a);b=integer(b);var t1=a-0x80000000;
var t2=b-0x80000000;if(t1>=0){if(t2>=0){return((t1|t2)+0x80000000);}
else{return((t1|b)+0x80000000);}}else{if(t2>=0){return((a|t2)+0x80000000);}
else{return(a|b);}}}function xor(a,b){a=integer(a);b=integer(b);
var t1=a-0x80000000;var t2=b-0x80000000;if(t1>=0){if(t2>=0){return(t1 ^ t2);}
else{return((t1 ^ b)+0x80000000);}}else{if(t2>=0){return((a ^ t2)+0x80000000);}
else{return(a ^ b);}}}function not(a){a=integer(a);return 0xffffffff-a;}
var state=new array(4);var count=new array(2);count[0]=0;count[1]=0;
var buffer=new array(64);var transformBuffer=new array(16);
var digestBits=new array(16);var S11=7;var S12=12;var S13=17;var S14=22;
var S21=5;var S22=9;var S23=14;var S24=20;var S31=4;var S32=11;var S33=16;
var S34=23;var S41=6;var S42=10;var S43=15;var S44=21;function F(x,y,z)
{return or(and(x,y),and(not(x),z));}function G(x,y,z){return or(and(x,z),and(y,
not(z)));}function H(x,y,z){return xor(xor(x,y),z);}function I(x,y,z)
{return xor(y,or(x,not(z)));}function rotateLeft(a,n){return or(shl(a,n),(shr(a,
(32-n))));}function FF(a,b,c,d,x,s,ac){a=a+F(b,c,d)+x+ac;a=rotateLeft(a,s);a=a+b;
return a;}function GG(a,b,c,d,x,s,ac){a=a+G(b,c,d)+x+ac;a=rotateLeft(a,s);a=a+b;
return a;}function HH(a,b,c,d,x,s,ac){a=a+H(b,c,d)+x+ac;a=rotateLeft(a,s);a=a+b;
return a;}function II(a,b,c,d,x,s,ac){a=a+I(b,c,d)+x+ac;a=rotateLeft(a,s);a=a+b;
return a;}function transform(buf,offset){var a=0,b=0,c=0,d=0;
var x=transformBuffer;a=state[0];b=state[1];c=state[2];d=state[3];for(i=0;i<16;
i++){x[i]=and(buf[i*4+offset],0xFF);for(j=1;j<4;j++)
{x[i]+=shl(and(buf[i*4+j+offset],0xFF),j*8);}}a=FF(a,b,c,d,x[0],S11,0xd76aa478);
d=FF(d,a,b,c,x[1],S12,0xe8c7b756);c=FF(c,d,a,b,x[2],S13,0x242070db);b=FF(b,c,d,a,
x[3],S14,0xc1bdceee);a=FF(a,b,c,d,x[4],S11,0xf57c0faf);d=FF(d,a,b,c,x[5],S12,
0x4787c62a);c=FF(c,d,a,b,x[6],S13,0xa8304613);b=FF(b,c,d,a,x[7],S14,0xfd469501);
a=FF(a,b,c,d,x[8],S11,0x698098d8);d=FF(d,a,b,c,x[9],S12,0x8b44f7af);c=FF(c,d,a,b,
x[10],S13,0xffff5bb1);b=FF(b,c,d,a,x[11],S14,0x895cd7be);a=FF(a,b,c,d,x[12],S11,
0x6b901122);d=FF(d,a,b,c,x[13],S12,0xfd987193);c=FF(c,d,a,b,x[14],S13,0xa679438e)
;b=FF(b,c,d,a,x[15],S14,0x49b40821);a=GG(a,b,c,d,x[1],S21,0xf61e2562);d=GG(d,a,b,
c,x[6],S22,0xc040b340);c=GG(c,d,a,b,x[11],S23,0x265e5a51);b=GG(b,c,d,a,x[0],S24,
0xe9b6c7aa);a=GG(a,b,c,d,x[5],S21,0xd62f105d);d=GG(d,a,b,c,x[10],S22,0x2441453);
c=GG(c,d,a,b,x[15],S23,0xd8a1e681);b=GG(b,c,d,a,x[4],S24,0xe7d3fbc8);a=GG(a,b,c,
d,x[9],S21,0x21e1cde6);d=GG(d,a,b,c,x[14],S22,0xc33707d6);c=GG(c,d,a,b,x[3],S23,
0xf4d50d87);b=GG(b,c,d,a,x[8],S24,0x455a14ed);a=GG(a,b,c,d,x[13],S21,0xa9e3e905);
d=GG(d,a,b,c,x[2],S22,0xfcefa3f8);c=GG(c,d,a,b,x[7],S23,0x676f02d9);b=GG(b,c,d,a,
x[12],S24,0x8d2a4c8a);a=HH(a,b,c,d,x[5],S31,0xfffa3942);d=HH(d,a,b,c,x[8],S32,
0x8771f681);c=HH(c,d,a,b,x[11],S33,0x6d9d6122);b=HH(b,c,d,a,x[14],S34,0xfde5380c)
;a=HH(a,b,c,d,x[1],S31,0xa4beea44);d=HH(d,a,b,c,x[4],S32,0x4bdecfa9);c=HH(c,d,a,
b,x[7],S33,0xf6bb4b60);b=HH(b,c,d,a,x[10],S34,0xbebfbc70);a=HH(a,b,c,d,x[13],S31,
0x289b7ec6);d=HH(d,a,b,c,x[0],S32,0xeaa127fa);c=HH(c,d,a,b,x[3],S33,0xd4ef3085);
b=HH(b,c,d,a,x[6],S34,0x4881d05);a=HH(a,b,c,d,x[9],S31,0xd9d4d039);d=HH(d,a,b,c,
x[12],S32,0xe6db99e5);c=HH(c,d,a,b,x[15],S33,0x1fa27cf8);b=HH(b,c,d,a,x[2],S34,
0xc4ac5665);a=II(a,b,c,d,x[0],S41,0xf4292244);d=II(d,a,b,c,x[7],S42,0x432aff97);
c=II(c,d,a,b,x[14],S43,0xab9423a7);b=II(b,c,d,a,x[5],S44,0xfc93a039);a=II(a,b,c,
d,x[12],S41,0x655b59c3);d=II(d,a,b,c,x[3],S42,0x8f0ccc92);c=II(c,d,a,b,x[10],S43,
0xffeff47d);b=II(b,c,d,a,x[1],S44,0x85845dd1);a=II(a,b,c,d,x[8],S41,0x6fa87e4f);
d=II(d,a,b,c,x[15],S42,0xfe2ce6e0);c=II(c,d,a,b,x[6],S43,0xa3014314);b=II(b,c,d,
a,x[13],S44,0x4e0811a1);a=II(a,b,c,d,x[4],S41,0xf7537e82);d=II(d,a,b,c,x[11],S42,
0xbd3af235);c=II(c,d,a,b,x[2],S43,0x2ad7d2bb);b=II(b,c,d,a,x[9],S44,0xeb86d391);
state[0]+=a;state[1]+=b;state[2]+=c;state[3]+=d;}function md5_init()
{count[0]=count[1]=0;state[0]=0x67452301;state[1]=0xefcdab89;state[2]=0x98badcfe;
state[3]=0x10325476;for(i=0;i<digestBits.length;i++){digestBits[i]=0;}}
function md5_update(b){var index,i;index=and(shr(count[0],3),0x3F);
if(count[0]<0xFFFFFFFF-7){count[0]+=8;}else{count[1]++;count[0]-=0xFFFFFFFF+1;
count[0]+=8;}buffer[index]=and(b,0xff);if(index>=63){transform(buffer,0);}}
function md5_finish(){var bits=new array(8);var padding;var i=0,index=0,padLen=0;
for(i=0;i<4;i++){bits[i]=and(shr(count[0],(i*8)),0xFF);}for(i=0;i<4;i++)
{bits[i+4]=and(shr(count[1],(i*8)),0xFF);}index=and(shr(count[0],3),0x3F);
padLen=(index<56)?(56-index):(120-index);padding=new array(64);padding[0]=0x80;
for(i=0;i<padLen;i++){md5_update(padding[i]);}for(i=0;i<8;i++)
{md5_update(bits[i]);}for(i=0;i<4;i++){for(j=0;j<4;j++)
{digestBits[i*4+j]=and(shr(state[i],(j*8)),0xFF);}}}
/* ]]> */
/* <![CDATA[ */
var base64code="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/",base64sent="?b64",
base64esent="?64b",base64addsent=true;function armour_base64(b){var b64t="";
var b64l=base64addsent?base64sent:"";var i;for(i=0;i<=b.length-3;i+=3)
{if((b64l.length+4)>maxLineLength){b64t+=b64l+"\n";b64l="";}
b64l+=base64code.charAt(b[i]>>2);b64l+=base64code.charAt(((b[i]&3)<<4)
|(b[i+1]>>4));b64l+=base64code.charAt(((b[i+1]&0xF)<<2)|(b[i+2]>>6));
b64l+=base64code.charAt(b[i+2]&0x3F);}if((b.length-i)==1)
{b64l+=base64code.charAt(b[i]>>2);b64l+=base64code.charAt(((b[i]&3)<<4));
b64l+="==";}else if((b.length-i)==2){b64l+=base64code.charAt(b[i]>>2);
b64l+=base64code.charAt(((b[i]&3)<<4)|(b[i+1]>>4));
b64l+=base64code.charAt(((b[i+1]&0xF)<<2));b64l+="=";}if((b64l.length+4)
>maxLineLength){b64t+=b64l+"\n";b64l="";}if(base64addsent)
{b64l+=base64esent;}b64t+=b64l+"\n";return b64t;}function disarm_base64(s)
{var b=new Array();var i=0,j,c,shortgroup=0,n=0;var d=new Array();
if((j=s.indexOf(base64sent))>=0){s=s.substring(j+base64sent.length,s.length);}
if((j=s.indexOf(base64esent))>=0){s=s.substring(0,j);}while(i<s.length)
{if(base64code.indexOf(s.charAt(i))!=-1){break;}i++;}while(i<s.length){for(j=0;
j<4;){if(i>=s.length){if(j>0){
//alert("Base64 cipher text truncated.");
return b;}break;}
c=base64code.indexOf(s.charAt(i));if(c>=0){d[j++]=c;}else if(s.charAt(i)=="=")
{d[j++]=0;shortgroup++;}else if(s.substring(i,i+base64esent.length)==base64esent)
{i=s.length;continue;}else{}i++;}if(j==4){b[n++]=((d[0]<<2)|(d[1]>>4))&0xFF;
if(shortgroup<2){b[n++]=((d[1]<<4)|(d[2]>>2))&0xFF;if(shortgroup<1)
{b[n++]=((d[2]<<6)|d[3])&0xFF;}}}}return b;}
/* ]]> */
/* <![CDATA[ */
function unicode_to_utf8(s){var utf8="";for(var n=0;n<s.length;n++)
{var c=s.charCodeAt(n);if(c<=0x7F){utf8+=String.fromCharCode(c);}
else if((c>=0x80)&&(c<=0x7FF)){utf8+=String.fromCharCode((c>>6)|0xC0);
utf8+=String.fromCharCode((c&0x3F)|0x80);}else{utf8+=String.fromCharCode((c>>12)
|0xE0);utf8+=String.fromCharCode(((c>>6)&0x3F)|0x80);
utf8+=String.fromCharCode((c&0x3F)|0x80);}}return utf8;}
function utf8_to_unicode(utf8){var s="",i=0,b1,b2,b2;while(i<utf8.length)
{b1=utf8.charCodeAt(i);if(b1<0x80){s+=String.fromCharCode(b1);i++;}
else if((b1>=0xC0)&&(b1<0xE0)){b2=utf8.charCodeAt(i+1);
s+=String.fromCharCode(((b1&0x1F)<<6)|(b2&0x3F));i+=2;}
else{b2=utf8.charCodeAt(i+1);b3=utf8.charCodeAt(i+2);
s+=String.fromCharCode(((b1&0xF)<<12)|((b2&0x3F)<<6)|(b3&0x3F));i+=3;}}return s;}
function encode_utf8(s){var i,necessary=false;for(i=0;i<s.length;i++)
{if((s.charCodeAt(i)==0x9D)||(s.charCodeAt(i)>0xFF)){necessary=true;break;}}
if(!necessary){return s;}return String.fromCharCode(0x9D)+unicode_to_utf8(s);}
function decode_utf8(s){if((s.length>0)&&(s.charCodeAt(0)==0x9D))
{return utf8_to_unicode(s.substring(1));}return s;}
/* ]]> */
/* <![CDATA[ */
var loadTime=(new Date()).getTime();var key;var prng;
function setKey(keyText) {
var s=encode_utf8(keyText);
var i,kmd5e,kmd5o;
if(s.length==1) {
s+=s;
}
md5_init();
for(i=0;i<s.length;i+=2) {
md5_update(s.charCodeAt(i));
}
md5_finish();
kmd5e=byteArrayToHex(digestBits);
md5_init();
for(i=1;i<s.length;i+=2) {
md5_update(s.charCodeAt(i));
}
md5_finish();
kmd5o=byteArrayToHex(digestBits);
var hs=kmd5e+kmd5o;
key=hexToByteArray(hs);
hs=byteArrayToHex(key);
}
function Decrypt_text(decryptID, encryptedText) {
var decryptIDElt = document.getElementById(decryptID);
if (encryptedText == null)
encryptedText = decryptIDElt.innerHTML;
// decryptIDElt.style.display="inline";
decryptIDElt.innerHTML = encryptedText.replace(/\n/g,'<br \/>').replace(/\\n/g,'<br \/>');
keyText = prompt("Please enter the decryption key", "");
setKey(keyText);
var ct=new Array();
// remove line breaks
ct=disarm_base64(encryptedText.replace(/<br>/gi, "").replace(/<br \/>/gi, "").replace(/\\n/gi, ""));
var result=rijndaelDecrypt(ct,key,"CBC");
var header=result.slice(0,20);
result=result.slice(20);
var dl=(header[16]<<24)|(header[17]<<16)|(header[18]<<8)|header[19];
if((dl<0)||(dl>result.length)) {
// alert("Message (length "+result.length+") truncated. "+dl+" characters expected.");
dl=result.length;
}
var i,plaintext="";
md5_init();
for(i=0;i<dl;i++) {
plaintext+=String.fromCharCode(result[i]);
md5_update(result[i]);
}
md5_finish();
successful = true;
for(i=0;i<digestBits.length;i++) {
if(digestBits[i]!=header[i]) {
alert("Invalid decryption key.");
successful = false;
break;
}
}
if (successful)
//decryptIDElt.firstChild.nodeValue=decode_utf8(plaintext);
decryptIDElt.innerHTML=decode_utf8(plaintext.replace(/\n/g,'<br \/>'));
}
/* ]]> */
To use it, you simply call the JavaScript in your header either with a
<script type="text/javascript" src="http://www.vincentcheung.ca/jsencryption/blogjscrypt.js"></script>
or, if you decided to host it yourself, point it to your own file. Alternatively, you may include the entire file into your header, saving a few milliseconds in the loading time:
<script type='text/javascript'>
//<![CDATA[..the code goes here..
>'));
}
/* ]]> */
</script>
Use the following code in your post to embed the encrypted text, hiding it:
<a href="javascript:Decrypt_text('unique_name', 'Encrypted text from step 1');">Show encrypted text</a>
<div id="unique_name"></div>
In the next episode, we’ll cover (and back up) the second version of Vincent’s script.
Sources / More info: flab, flab-dl-zip, veenix-1, encrypt-1, js-1
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