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SJCL is open. You can use, modify and redistribute it under a BSD
license or under the GNU GPL, version 2.0.

---------------------------------------------------------------------

http://opensource.org/licenses/BSD-2-Clause

Copyright (c) 2009-2015, Emily Stark, Mike Hamburg and Dan Boneh at
Stanford University. All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.

2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

---------------------------------------------------------------------

http://opensource.org/licenses/GPL-2.0

The Stanford Javascript Crypto Library (hosted here on GitHub) is a
project by the Stanford Computer Security Lab to build a secure,
powerful, fast, small, easy-to-use, cross-browser library for
cryptography in Javascript.

Copyright (c) 2009-2015, Emily Stark, Mike Hamburg and Dan Boneh at
Stanford University.

This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2 of the License, or (at your
option) any later version.

This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
Public License for more details.

You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

*/
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r=y.clamp(r,d),t&&(n=h.mode.gcm.j(a,s,r)),t=[Math.floor(p/4294967296),4294967295&p,Math.floor(d/4294967296),4294967295&d],n=h.mode.gcm.j(a,n,t),c=e.encrypt(i),n[0]^=c[0],n[1]^=c[1],n[2]^=c[2],n[3]^=c[3],{tag:y.bitSlice(n,0,o),data:r}}},h.misc.hmac=function(t,e){this.W=e=e||h.hash.sha256;var r,n=[[],[]],i=e.prototype.blockSize/32;for(this.w=[new e,new e],t.length>i&&(t=e.hash(t)),r=0;r<i;r++)n[0][r]=909522486^t[r],n[1][r]=1549556828^t[r];this.w[0].update(n[0]),this.w[1].update(n[1]),this.R=new e(this.w[0])},h.misc.hmac.prototype.encrypt=h.misc.hmac.prototype.mac=function(t){if(this.aa)throw new h.exception.invalid("encrypt on already updated hmac called!");return this.update(t),this.digest(t)},h.misc.hmac.prototype.reset=function(){this.R=new this.W(this.w[0]),this.aa=!1},h.misc.hmac.prototype.update=function(t){this.aa=!0,this.R.update(t)},h.misc.hmac.prototype.digest=function(){var t=this.R.finalize(),t=new this.W(this.w[1]).update(t).finalize();return this.reset(),t},h.misc.pbkdf2=function(t,e,r,n,i){if(r=r||1e4,0>n||0>r)throw new h.exception.invalid("invalid params to pbkdf2");"string"==typeof t&&(t=h.codec.utf8String.toBits(t)),"string"==typeof e&&(e=h.codec.utf8String.toBits(e)),i=i||h.misc.hmac,t=new i(t);var o,a,s,c,u=[],l=h.bitArray;for(c=1;32*u.length<(n||1);c++){for(i=o=t.encrypt(l.concat(e,[c])),a=1;a<r;a++)for(o=t.encrypt(o),s=0;s<o.length;s++)i[s]^=o[s];u=u.concat(i)}return n&&(u=l.clamp(u,n)),u},h.prng=function(t){this.c=[new h.hash.sha256],this.m=[0],this.P=0,this.H={},this.N=0,this.U={},this.Z=this.f=this.o=this.ha=0,this.b=[0,0,0,0,0,0,0,0],this.h=[0,0,0,0],this.L=void 0,this.M=t,this.D=!1,this.K={progress:{},seeded:{}},this.u=this.ga=0,this.I=1,this.J=2,this.ca=65536,this.T=[0,48,64,96,128,192,256,384,512,768,1024],this.da=3e4,this.ba=80},h.prng.prototype={randomWords:function(t,e){var r,n=[];r=this.isReady(e);var i;if(r===this.u)throw new h.exception.notReady("generator isn't seeded");if(r&this.J){r=!(r&this.I),i=[];var o,c=0;for(this.Z=i[0]=(new Date).valueOf()+this.da,o=0;16>o;o++)i.push(4294967296*Math.random()|0);for(o=0;o<this.c.length&&(i=i.concat(this.c[o].finalize()),c+=this.m[o],this.m[o]=0,r||!(this.P&1<<o));o++);for(this.P>=1<<this.c.length&&(this.c.push(new h.hash.sha256),this.m.push(0)),this.f-=c,c>this.o&&(this.o=c),this.P++,this.b=h.hash.sha256.hash(this.b.concat(i)),this.L=new h.cipher.aes(this.b),r=0;4>r&&(this.h[r]=this.h[r]+1|0,!this.h[r]);r++);}for(r=0;r<t;r+=4)0==(r+1)%this.ca&&a(this),i=s(this),n.push(i[0],i[1],i[2],i[3]);return a(this),n.slice(0,t)},setDefaultParanoia:function(t,e){if(0===t&&"Setting paranoia=0 will ruin your security; use it only for testing"!==e)throw new h.exception.invalid("Setting paranoia=0 will ruin your security; use it only for testing");this.M=t},addEntropy:function(t,e,r){r=r||"user";var n,o,a=(new Date).valueOf(),s=this.H[r],c=this.isReady(),u=0;switch(n=this.U[r],void 0===n&&(n=this.U[r]=this.ha++),void 0===s&&(s=this.H[r]=0),this.H[r]=(this.H[r]+1)%this.c.length,typeof t){case"number":void 0===e&&(e=1),this.c[s].update([n,this.N++,1,e,a,1,0|t]);break;case"object":if("[object Uint32Array]"===(r=Object.prototype.toString.call(t))){for(o=[],r=0;r<t.length;r++)o.push(t[r]);t=o}else for("[object Array]"!==r&&(u=1),r=0;r<t.length&&!u;r++)"number"!=typeof t[r]&&(u=1);if(!u){if(void 0===e)for(r=e=0;r<t.length;r++)for(o=t[r];0<o;)e++,o>>>=1;this.c[s].update([n,this.N++,2,e,a,t.length].concat(t))}break;case"string":void 0===e&&(e=t.length),this.c[s].update([n,this.N++,3,e,a,t.length]),this.c[s].update(t);break;default:u=1}if(u)throw new h.exception.bug("random: addEntropy only supports number, array of numbers or string");this.m[s]+=e,this.f+=e,c===this.u&&(this.isReady()!==this.u&&i("seeded",Math.max(this.o,this.f)),i("progress",this.getProgress()))},isReady:function(t){return t=this.T[void 0!==t?t:this.M],this.o&&this.o>=t?this.m[0]>this.ba&&(new Date).valueOf()>this.Z?this.J|this.I:this.I:this.f>=t?this.J|this.u:this.u},getProgress:function(t){return t=this.T[t||this.M],this.o>=t?1:this.f>t?1:this.f/t},startCollectors:function(){if(!this.D){if(this.a={loadTimeCollector:c(this,this.ma),mouseCollector:c(this,this.oa),keyboardCollector:c(this,this.la),accelerometerCollector:c(this,this.ea),touchCollector:c(this,this.qa)},window.addEventListener)window.addEventListener("load",this.a.loadTimeCollector,!1),window.addEventListener("mousemove",this.a.mouseCollector,!1),window.addEventListener("keypress",this.a.keyboardCollector,!1),window.addEventListener("devicemotion",this.a.accelerometerCollector,!1),window.addEventListener("touchmove",this.a.touchCollector,!1);else{if(!document.attachEvent)throw new h.exception.bug("can't attach event");document.attachEvent("onload",this.a.loadTimeCollector),document.attachEvent("onmousemove",this.a.mouseCollector),document.attachEvent("keypress",this.a.keyboardCollector)}this.D=!0}},stopCollectors:function(){this.D&&(window.removeEventListener?(window.removeEventListener("load",this.a.loadTimeCollector,!1),window.removeEventListener("mousemove",this.a.mouseCollector,!1),window.removeEventListener("keypress",this.a.keyboardCollector,!1),window.removeEventListener("devicemotion",this.a.accelerometerCollector,!1),window.removeEventListener("touchmove",this.a.touchCollector,!1)):document.detachEvent&&(document.detachEvent("onload",this.a.loadTimeCollector),document.detachEvent("onmousemove",this.a.mouseCollector),document.detachEvent("keypress",this.a.keyboardCollector)),this.D=!1)},addEventListener:function(t,e){this.K[t][this.ga++]=e},removeEventListener:function(t,e){var r,n,i=this.K[t],o=[];for(n in i)i.hasOwnProperty(n)&&i[n]===e&&o.push(n);for(r=0;r<o.length;r++)n=o[r],delete i[n]},la:function(){o(this,1)},oa:function(t){var e,r;try{e=t.x||t.clientX||t.offsetX||0,r=t.y||t.clientY||t.offsetY||0}catch(t){r=e=0}0!=e&&0!=r&&this.addEntropy([e,r],2,"mouse"),o(this,0)},qa:function(t){t=t.touches[0]||t.changedTouches[0],this.addEntropy([t.pageX||t.clientX,t.pageY||t.clientY],1,"touch"),o(this,0)},ma:function(){o(this,2)},ea:function(t){if(t=t.accelerationIncludingGravity.x||t.accelerationIncludingGravity.y||t.accelerationIncludingGravity.z,window.orientation){var e=window.orientation;"number"==typeof e&&this.addEntropy(e,1,"accelerometer")}t&&this.addEntropy(t,2,"accelerometer"),o(this,0)}},h.random=new h.prng(6);t:try{var u,l,f,d;if(d=void 0!==t&&t.exports){var p;try{p=require("crypto")}catch(t){p=null}d=l=p}if(d&&l.randomBytes)u=l.randomBytes(128),u=new Uint32Array(new Uint8Array(u).buffer),h.random.addEntropy(u,1024,"crypto['randomBytes']");else if("undefined"!=typeof window&&"undefined"!=typeof Uint32Array){if(f=new Uint32Array(32),window.crypto&&window.crypto.getRandomValues)window.crypto.getRandomValues(f);else{if(!window.msCrypto||!window.msCrypto.getRandomValues)break t;window.msCrypto.getRandomValues(f)}h.random.addEntropy(f,1024,"crypto['getRandomValues']")}}catch(t){"undefined"!=typeof window&&window.console&&(console.log("There was an error collecting entropy from the browser:"),console.log(t))}h.json={defaults:{v:1,iter:1e4,ks:128,ts:64,mode:"ccm",adata:"",cipher:"aes"},ja:function(t,e,r,n){r=r||{},n=n||{};var i,o=h.json,a=o.g({iv:h.random.randomWords(4,0)},o.defaults);if(o.g(a,r),r=a.adata,"string"==typeof a.salt&&(a.salt=h.codec.base64.toBits(a.salt)),"string"==typeof a.iv&&(a.iv=h.codec.base64.toBits(a.iv)),!h.mode[a.mode]||!h.cipher[a.cipher]||"string"==typeof t&&100>=a.iter||64!==a.ts&&96!==a.ts&&128!==a.ts||128!==a.ks&&192!==a.ks&&256!==a.ks||2>a.iv.length||4<a.iv.length)throw new h.exception.invalid("json encrypt: invalid parameters");return"string"==typeof t?(i=h.misc.cachedPbkdf2(t,a),t=i.key.slice(0,a.ks/32),a.salt=i.salt):h.ecc&&t instanceof h.ecc.elGamal.publicKey&&(i=t.kem(),a.kemtag=i.tag,t=i.key.slice(0,a.ks/32)),"string"==typeof e&&(e=h.codec.utf8String.toBits(e)),"string"==typeof r&&(a.adata=r=h.codec.utf8String.toBits(r)),i=new h.cipher[a.cipher](t),o.g(n,a),n.key=t,a.ct="ccm"===a.mode&&h.arrayBuffer&&h.arrayBuffer.ccm&&e instanceof ArrayBuffer?h.arrayBuffer.ccm.encrypt(i,e,a.iv,r,a.ts):h.mode[a.mode].encrypt(i,e,a.iv,r,a.ts),a},encrypt:function(t,e,r,n){var i=h.json,o=i.ja.apply(i,arguments);return i.encode(o)},ia:function(t,e,r,n){r=r||{},n=n||{};var i=h.json;e=i.g(i.g(i.g({},i.defaults),e),r,!0);var o,a;if(o=e.adata,"string"==typeof e.salt&&(e.salt=h.codec.base64.toBits(e.salt)),"string"==typeof e.iv&&(e.iv=h.codec.base64.toBits(e.iv)),!h.mode[e.mode]||!h.cipher[e.cipher]||"string"==typeof t&&100>=e.iter||64!==e.ts&&96!==e.ts&&128!==e.ts||128!==e.ks&&192!==e.ks&&256!==e.ks||!e.iv||2>e.iv.length||4<e.iv.length)throw new h.exception.invalid("json decrypt: invalid parameters");return"string"==typeof t?(a=h.misc.cachedPbkdf2(t,e),t=a.key.slice(0,e.ks/32),e.salt=a.salt):h.ecc&&t instanceof h.ecc.elGamal.secretKey&&(t=t.unkem(h.codec.base64.toBits(e.kemtag)).slice(0,e.ks/32)),"string"==typeof o&&(o=h.codec.utf8String.toBits(o)),a=new h.cipher[e.cipher](t),o="ccm"===e.mode&&h.arrayBuffer&&h.arrayBuffer.ccm&&e.ct instanceof ArrayBuffer?h.arrayBuffer.ccm.decrypt(a,e.ct,e.iv,e.tag,o,e.ts):h.mode[e.mode].decrypt(a,e.ct,e.iv,o,e.ts),i.g(n,e),n.key=t,1===r.raw?o:h.codec.utf8String.fromBits(o)},decrypt:function(t,e,r,n){var i=h.json;return i.ia(t,i.decode(e),r,n)},encode:function(t){var e,r="{",n="";for(e in t)if(t.hasOwnProperty(e)){if(!e.match(/^[a-z0-9]+$/i))throw new h.exception.invalid("json encode: invalid property name");switch(r+=n+'"'+e+'":',n=",",typeof t[e]){case"number":case"boolean":r+=t[e];break;case"string":r+='"'+escape(t[e])+'"';break;case"object":r+='"'+h.codec.base64.fromBits(t[e],0)+'"';break;default:throw new h.exception.bug("json encode: unsupported type")}}return r+"}"},decode:function(t){if(t=t.replace(/\s/g,""),!t.match(/^\{.*\}$/))throw new h.exception.invalid("json decode: this isn't json!");t=t.replace(/^\{|\}$/g,"").split(/,/);var e,r,n={};for(e=0;e<t.length;e++){if(!(r=t[e].match(/^\s*(?:(["']?)([a-z][a-z0-9]*)\1)\s*:\s*(?:(-?\d+)|"([a-z0-9+\/%*_.@=\-]*)"|(true|false))$/i)))throw new h.exception.invalid("json decode: this isn't json!");null!=r[3]?n[r[2]]=parseInt(r[3],10):null!=r[4]?n[r[2]]=r[2].match(/^(ct|adata|salt|iv)$/)?h.codec.base64.toBits(r[4]):unescape(r[4]):null!=r[5]&&(n[r[2]]="true"===r[5])}return n},g:function(t,e,r){if(void 0===t&&(t={}),void 0===e)return t;for(var n in e)if(e.hasOwnProperty(n)){if(r&&void 0!==t[n]&&t[n]!==e[n])throw new h.exception.invalid("required parameter overridden");t[n]=e[n]}return t},sa:function(t,e){var r,n={};for(r in t)t.hasOwnProperty(r)&&t[r]!==e[r]&&(n[r]=t[r]);return n},ra:function(t,e){var r,n={};for(r=0;r<e.length;r++)void 0!==t[e[r]]&&(n[e[r]]=t[e[r]]);return n}},h.encrypt=h.json.encrypt,h.decrypt=h.json.decrypt,h.misc.pa={},h.misc.cachedPbkdf2=function(t,e){var r,n=h.misc.pa;return e=e||{},r=e.iter||1e3,n=n[t]=n[t]||{},r=n[r]=n[r]||{firstSalt:e.salt&&e.salt.length?e.salt.slice(0):h.random.randomWords(2,0)},n=void 0===e.salt?r.firstSalt:e.salt,r[n]=r[n]||h.misc.pbkdf2(t,n,e.iter),{key:r[n].slice(0),salt:n.slice(0)}},void 0!==t&&t.exports&&(t.exports=h),"function"==typeof define&&define([],function(){return h})}})});