// Uses Chris Veness' AES implementation 
function Cipher(input,w){var Nb=4;var Nr=w.length/Nb-1;var state=[[],[],[],[]];for(var i=0;i<4*Nb;i++)state[i%4][Math.floor(i/4)]=input[i];state=AddRoundKey(state,w,0,Nb);for(var round=1;round<Nr;round++){state=SubBytes(state,Nb);state=ShiftRows(state,Nb);state=MixColumns(state,Nb);state=AddRoundKey(state,w,round,Nb);}
state=SubBytes(state,Nb);state=ShiftRows(state,Nb);state=AddRoundKey(state,w,Nr,Nb);var output=new Array(4*Nb);for(var i=0;i<4*Nb;i++)output[i]=state[i%4][Math.floor(i/4)];return output;}
function SubBytes(s,Nb){for(var r=0;r<4;r++){for(var c=0;c<Nb;c++)s[r][c]=Sbox[s[r][c]];}
return s;}
function ShiftRows(s,Nb){var t=new Array(4);for(var r=1;r<4;r++){for(var c=0;c<4;c++)t[c]=s[r][(c+r)%Nb];for(var c=0;c<4;c++)s[r][c]=t[c];}
return s;}
function MixColumns(s,Nb){for(var c=0;c<4;c++){var a=new Array(4);var b=new Array(4);for(var i=0;i<4;i++){a[i]=s[i][c];b[i]=s[i][c]&0x80?s[i][c]<<1^0x011b:s[i][c]<<1;}
s[0][c]=b[0]^a[1]^b[1]^a[2]^a[3];s[1][c]=a[0]^b[1]^a[2]^b[2]^a[3];s[2][c]=a[0]^a[1]^b[2]^a[3]^b[3];s[3][c]=a[0]^b[0]^a[1]^a[2]^b[3];}
return s;}
function AddRoundKey(state,w,rnd,Nb){for(var r=0;r<4;r++){for(var c=0;c<Nb;c++)state[r][c]^=w[rnd*4+c][r];}
return state;}
function KeyExpansion(key){var Nb=4;var Nk=key.length/4
var Nr=Nk+6;var w=new Array(Nb*(Nr+1));var temp=new Array(4);for(var i=0;i<Nk;i++){var r=[key[4*i],key[4*i+1],key[4*i+2],key[4*i+3]];w[i]=r;}
for(var i=Nk;i<(Nb*(Nr+1));i++){w[i]=new Array(4);for(var t=0;t<4;t++)temp[t]=w[i-1][t];if(i%Nk==0){temp=SubWord(RotWord(temp));for(var t=0;t<4;t++)temp[t]^=Rcon[i/Nk][t];}else if(Nk>6&&i%Nk==4){temp=SubWord(temp);}
for(var t=0;t<4;t++)w[i][t]=w[i-Nk][t]^temp[t];}
return w;}
function SubWord(w){for(var i=0;i<4;i++)w[i]=Sbox[w[i]];return w;}
function RotWord(w){var tmp=w[0];for(var i=0;i<3;i++)w[i]=w[i+1];w[3]=tmp;return w;}
var Sbox=[0x63,0x7c,0x77,0x7b,0xf2,0x6b,0x6f,0xc5,0x30,0x01,0x67,0x2b,0xfe,0xd7,0xab,0x76,0xca,0x82,0xc9,0x7d,0xfa,0x59,0x47,0xf0,0xad,0xd4,0xa2,0xaf,0x9c,0xa4,0x72,0xc0,0xb7,0xfd,0x93,0x26,0x36,0x3f,0xf7,0xcc,0x34,0xa5,0xe5,0xf1,0x71,0xd8,0x31,0x15,0x04,0xc7,0x23,0xc3,0x18,0x96,0x05,0x9a,0x07,0x12,0x80,0xe2,0xeb,0x27,0xb2,0x75,0x09,0x83,0x2c,0x1a,0x1b,0x6e,0x5a,0xa0,0x52,0x3b,0xd6,0xb3,0x29,0xe3,0x2f,0x84,0x53,0xd1,0x00,0xed,0x20,0xfc,0xb1,0x5b,0x6a,0xcb,0xbe,0x39,0x4a,0x4c,0x58,0xcf,0xd0,0xef,0xaa,0xfb,0x43,0x4d,0x33,0x85,0x45,0xf9,0x02,0x7f,0x50,0x3c,0x9f,0xa8,0x51,0xa3,0x40,0x8f,0x92,0x9d,0x38,0xf5,0xbc,0xb6,0xda,0x21,0x10,0xff,0xf3,0xd2,0xcd,0x0c,0x13,0xec,0x5f,0x97,0x44,0x17,0xc4,0xa7,0x7e,0x3d,0x64,0x5d,0x19,0x73,0x60,0x81,0x4f,0xdc,0x22,0x2a,0x90,0x88,0x46,0xee,0xb8,0x14,0xde,0x5e,0x0b,0xdb,0xe0,0x32,0x3a,0x0a,0x49,0x06,0x24,0x5c,0xc2,0xd3,0xac,0x62,0x91,0x95,0xe4,0x79,0xe7,0xc8,0x37,0x6d,0x8d,0xd5,0x4e,0xa9,0x6c,0x56,0xf4,0xea,0x65,0x7a,0xae,0x08,0xba,0x78,0x25,0x2e,0x1c,0xa6,0xb4,0xc6,0xe8,0xdd,0x74,0x1f,0x4b,0xbd,0x8b,0x8a,0x70,0x3e,0xb5,0x66,0x48,0x03,0xf6,0x0e,0x61,0x35,0x57,0xb9,0x86,0xc1,0x1d,0x9e,0xe1,0xf8,0x98,0x11,0x69,0xd9,0x8e,0x94,0x9b,0x1e,0x87,0xe9,0xce,0x55,0x28,0xdf,0x8c,0xa1,0x89,0x0d,0xbf,0xe6,0x42,0x68,0x41,0x99,0x2d,0x0f,0xb0,0x54,0xbb,0x16];var Rcon=[[0x00,0x00,0x00,0x00],[0x01,0x00,0x00,0x00],[0x02,0x00,0x00,0x00],[0x04,0x00,0x00,0x00],[0x08,0x00,0x00,0x00],[0x10,0x00,0x00,0x00],[0x20,0x00,0x00,0x00],[0x40,0x00,0x00,0x00],[0x80,0x00,0x00,0x00],[0x1b,0x00,0x00,0x00],[0x36,0x00,0x00,0x00]];function AESEncryptCtr(plaintext,password,nBits){var blockSize=16;if(!(nBits==128||nBits==192||nBits==256))return'';plaintext=plaintext.encodeUTF8();password=password.encodeUTF8();var nBytes=nBits/8;var pwBytes=new Array(nBytes);for(var i=0;i<nBytes;i++){pwBytes[i]=isNaN(password.charCodeAt(i))?0:password.charCodeAt(i);}
var key=Cipher(pwBytes,KeyExpansion(pwBytes));key=key.concat(key.slice(0,nBytes-16));var counterBlock=new Array(blockSize);var nonce=(new Date()).getTime();var nonceSec=Math.floor(nonce/1000);var nonceMs=nonce%1000;for(var i=0;i<4;i++)counterBlock[i]=(nonceSec>>>i*8)&0xff;for(var i=0;i<4;i++)counterBlock[i+4]=nonceMs&0xff;var ctrTxt='';for(var i=0;i<8;i++)ctrTxt+=String.fromCharCode(counterBlock[i]);var keySchedule=KeyExpansion(key);var blockCount=Math.ceil(plaintext.length/blockSize);var ciphertxt=new Array(blockCount);for(var b=0;b<blockCount;b++){for(var c=0;c<4;c++)counterBlock[15-c]=(b>>>c*8)&0xff;for(var c=0;c<4;c++)counterBlock[15-c-4]=(b/0x100000000>>>c*8)
var cipherCntr=Cipher(counterBlock,keySchedule);var blockLength=b<blockCount-1?blockSize:(plaintext.length-1)%blockSize+1;var cipherChar=new Array(blockLength);for(var i=0;i<blockLength;i++){cipherChar[i]=cipherCntr[i]^plaintext.charCodeAt(b*blockSize+i);cipherChar[i]=String.fromCharCode(cipherChar[i]);}
ciphertxt[b]=cipherChar.join('');}
var ciphertext=ctrTxt+ciphertxt.join('');ciphertext=ciphertext.encodeBase64();return ciphertext;}
function AESDecryptCtr(ciphertext,password,nBits){var blockSize=16;if(!(nBits==128||nBits==192||nBits==256))return'';ciphertext=ciphertext.decodeBase64();password=password.encodeUTF8();var nBytes=nBits/8;var pwBytes=new Array(nBytes);for(var i=0;i<nBytes;i++){pwBytes[i]=isNaN(password.charCodeAt(i))?0:password.charCodeAt(i);}
var key=Cipher(pwBytes,KeyExpansion(pwBytes));key=key.concat(key.slice(0,nBytes-16));var counterBlock=new Array(8);ctrTxt=ciphertext.slice(0,8);for(var i=0;i<8;i++)counterBlock[i]=ctrTxt.charCodeAt(i);var keySchedule=KeyExpansion(key);var nBlocks=Math.ceil((ciphertext.length-8)/blockSize);var ct=new Array(nBlocks);for(var b=0;b<nBlocks;b++)ct[b]=ciphertext.slice(8+b*blockSize,8+b*blockSize+blockSize);ciphertext=ct;var plaintxt=new Array(ciphertext.length);for(var b=0;b<nBlocks;b++){for(var c=0;c<4;c++)counterBlock[15-c]=((b)>>>c*8)&0xff;for(var c=0;c<4;c++)counterBlock[15-c-4]=(((b+1)/0x100000000-1)>>>c*8)&0xff;var cipherCntr=Cipher(counterBlock,keySchedule);var plaintxtByte=new Array(ciphertext[b].length);for(var i=0;i<ciphertext[b].length;i++){plaintxtByte[i]=cipherCntr[i]^ciphertext[b].charCodeAt(i);plaintxtByte[i]=String.fromCharCode(plaintxtByte[i]);}
plaintxt[b]=plaintxtByte.join('');}
var plaintext=plaintxt.join('');plaintext=plaintext.decodeUTF8();return plaintext;}
var b64="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";String.prototype.encodeBase64=function(utf8encode){utf8encode=(typeof utf8encode=='undefined')?false:utf8encode;var o1,o2,o3,bits,h1,h2,h3,h4,e=[],pad='',c,plain,coded;plain=utf8encode?this.encodeUTF8():this;c=plain.length%3;if(c>0){while(c++<3){pad+='=';plain+='\0';}}
for(c=0;c<plain.length;c+=3){o1=plain.charCodeAt(c);o2=plain.charCodeAt(c+1);o3=plain.charCodeAt(c+2);bits=o1<<16|o2<<8|o3;h1=bits>>18&0x3f;h2=bits>>12&0x3f;h3=bits>>6&0x3f;h4=bits&0x3f;e[c/3]=b64.charAt(h1)+b64.charAt(h2)+b64.charAt(h3)+b64.charAt(h4);}
coded=e.join('');coded=coded.slice(0,coded.length-pad.length)+pad;return coded;}
String.prototype.decodeBase64=function(utf8decode){utf8decode=(typeof utf8decode=='undefined')?false:utf8decode;var o1,o2,o3,h1,h2,h3,h4,bits,d=[],plain,coded;coded=utf8decode?this.decodeUTF8():this;for(var c=0;c<coded.length;c+=4){h1=b64.indexOf(coded.charAt(c));h2=b64.indexOf(coded.charAt(c+1));h3=b64.indexOf(coded.charAt(c+2));h4=b64.indexOf(coded.charAt(c+3));bits=h1<<18|h2<<12|h3<<6|h4;o1=bits>>>16&0xff;o2=bits>>>8&0xff;o3=bits&0xff;d[c/4]=String.fromCharCode(o1,o2,o3);if(h4==0x40)d[c/4]=String.fromCharCode(o1,o2);if(h3==0x40)d[c/4]=String.fromCharCode(o1);}
plain=d.join('');return utf8decode?plain.decodeUTF8():plain;}
String.prototype.encodeUTF8=function(){var str=this.replace(/[\u0080-\u07ff]/g,function(c){var cc=c.charCodeAt(0);return String.fromCharCode(0xc0|cc>>6,0x80|cc&0x3f);});str=str.replace(/[\u0800-\uffff]/g,function(c){var cc=c.charCodeAt(0);return String.fromCharCode(0xe0|cc>>12,0x80|cc>>6&0x3F,0x80|cc&0x3f);});return str;}
String.prototype.decodeUTF8=function(){var str=this.replace(/[\u00c0-\u00df][\u0080-\u00bf]/g,function(c){var cc=(c.charCodeAt(0)&0x1f)<<6|c.charCodeAt(1)&0x3f;return String.fromCharCode(cc);});str=str.replace(/[\u00e0-\u00ef][\u0080-\u00bf][\u0080-\u00bf]/g,function(c){var cc=((c.charCodeAt(0)&0x0f)<<12)|((c.charCodeAt(1)&0x3f)<<6)|(c.charCodeAt(2)&0x3f);return String.fromCharCode(cc);});return str;}
function choose()
{if(document.getElementById("plaintext").value.substr(0,10)=="?encritter"){decrypt();}
else{encrypt();}}
function encrypt()
{plain=document.getElementById("plaintext").value;userPassword=document.getElementById("password").value;cipher=AESEncryptCtr(plain,userPassword,128);segments=Math.floor((cipher.length+139)/140);segments=Math.floor((12*segments+cipher.length+139)/140);if(segments>9){alert("Use email!");}
else{displayCipherText="?encritter_"+"1"+segments+cipher.substr(0,127)+"<br><br>";cipher=cipher.substr(127);for(i=2;i<=segments;i++){displayCipherText+="?encritter_"+i+segments+cipher.substr(0,127)+"<br>";cipher=cipher.substr(127);}
document.getElementById("ciphertext").innerHTML=displayCipherText;}}
function decrypt()
{cipher=document.getElementById("plaintext").value;userPassword=document.getElementById("password").value;cipher=cipher.replace(/\?encritter_\d\d/g,"");cipher=cipher.replace(/\n/g,"");displayPlainText=AESDecryptCtr(cipher,userPassword,128);document.getElementById("ciphertext").innerHTML=displayPlainText;}