/***
|Name       ||
|Description|Adds AES encryption and password protection and several macros to work with them|
|Version    |1.7.2|
|Source     |https://github.com/YakovL/TiddlyWiki_EncryptionPlugin/blob/master/EncryptionPlugin.js|
|Author     |Yakov Litvin|
|Forked from|[[EncryptedVaultPlugin|http://visualtw.ouvaton.org/VisualTW.html#EncryptedVaultPlugin]] by Pascal Collin (now available at [[GitHub|https://yakovl.github.io/VisualTW2/VisualTW2.html#EncryptedVaultPlugin]] or [[in web archive|https://web.archive.org/web/20160130130224/http://visualtw.ouvaton.org/VisualTW.html#EncryptedVaultPlugin]])|
|''Browser:''|plugin is supposed to work in any modern browser, but it is recommended to create a backup of your TW before trying it with your setup|
patched plugin, made a simplest test; fixed a couple of bugs (how ~EncryptedVaultPlugin even worked previously?), moved styles from custom block to a shadow, removed several overridings with decorators, changed UI for pass (hidden, autofocus, enter to apply); now {{PoG{test thoroughly (migration from ~EncryptedVaultPlugin; including, DefaultTiddlers, first run of the plugin, macros appearence and usage, data format compatibility, including unencrypted, ...; .oO MVP for ...) and update metadata}}}:

|''License:''|[[BSD open source license|License]]|
!Description
* Create an ''encrypted vault'' where all tiddlers are ''password protected''.
* By default, only the system tiddlers (shadow ones and those tagged {{{systemConfig}}}) aren't encrypted. Also, if you create [[ListUnencrypted]] and put a [[filter|classic.tiddlywiki.com#Filters]] there, the filtered tiddlers won't be encrypted, too.
* Even shadow tiddlers (MainMenu, SiteTitle, PageTemplate, StyleSheet, ...) ''can be encrypted''. The shadow version is used until unlocking.
!Demo
--Use <<unlock>> button on a protected wiki. By example: http://visualtw.ouvaton.org/demo/EncryptedVaultPlugin.html--
!Installation
# Import/copy the plugin (tagged with {{{systemConfig}}}), save and reload (as usual)
# Save one more time (to create the encrypted vault) and reload
# Set a password
!Usage
* TODO: describe backward compatibility with .. plugin ("migration")
* Use <<unlock>><<setPassword>> button (available by default in SideBarOptions)
* Use a blank password to save unencrypted (disable vault usage)
* Use {{{unencrypted}}} tag to avoid encryption for some tiddler
* Use {{{forceEncryption}}} tag to force some shadow tiddler to be encrypted
* TODO: describe other macros
!Configuration
The following macros are available:
* {{{<<unlock ButtonTitle ButtonTooltip OpenTiddlersWhenUnlock CloseTiddlersWhenUnlock>>}}} creates a button to unlock the encrypted vault (all parameters are optional)
* {{{<<setPassword ButtonTitle ButtonTooltip>>}}} if unlocked, creates a button to set the current password (all parameters are optional)
* {{{<<purge ButtonTitle ButtonTooltip>>}}} if locked, creates a button to purge a locked vault, useful for lost password (encrypted content is the deleted)
* {{{<<ifLocked tiddlyText>>}}} displays tiddlyText (wikified) if the vault is locked
* {{{<<ifUnlocked tiddlyText>>}}} displays tiddlyText (wikified) if the vault is unlocked
<<ifLocked "!!!!Lost password ?">><<ifLocked "Click on">> <<purge>><<ifLocked "to delete any content locked in the encrypted vault.">>
***/
/***
Stanford Javascript Crypto Library {{DDnc{v.1.0.6 ([[63eed5|https://github.com/bitwiseshiftleft/sjcl/commit/63eed58b9dc395afb3c03df8d70d7e7bf4c88b1b]]), update!}}}, source: https://github.com/bitwiseshiftleft/sjcl
+ one line to make `sjcl` globally accessible
***/
//{{{
"use strict";var sjcl={cipher:{},hash:{},keyexchange:{},mode:{},misc:{},codec:{},exception:{corrupt:function(a){this.toString=function(){return"CORRUPT: "+this.message};this.message=a},invalid:function(a){this.toString=function(){return"INVALID: "+this.message};this.message=a},bug:function(a){this.toString=function(){return"BUG: "+this.message};this.message=a},notReady:function(a){this.toString=function(){return"NOT READY: "+this.message};this.message=a}}};
sjcl.cipher.aes=function(a){this.s[0][0][0]||this.O();var b,c,d,e,f=this.s[0][4],g=this.s[1];b=a.length;var h=1;if(4!==b&&6!==b&&8!==b)throw new sjcl.exception.invalid("invalid aes key size");this.b=[d=a.slice(0),e=[]];for(a=b;a<4*b+28;a++){c=d[a-1];if(0===a%b||8===b&&4===a%b)c=f[c>>>24]<<24^f[c>>16&255]<<16^f[c>>8&255]<<8^f[c&255],0===a%b&&(c=c<<8^c>>>24^h<<24,h=h<<1^283*(h>>7));d[a]=d[a-b]^c}for(b=0;a;b++,a--)c=d[b&3?a:a-4],e[b]=4>=a||4>b?c:g[0][f[c>>>24]]^g[1][f[c>>16&255]]^g[2][f[c>>8&255]]^g[3][f[c&
255]]};
sjcl.cipher.aes.prototype={encrypt:function(a){return t(this,a,0)},decrypt:function(a){return t(this,a,1)},s:[[[],[],[],[],[]],[[],[],[],[],[]]],O:function(){var a=this.s[0],b=this.s[1],c=a[4],d=b[4],e,f,g,h=[],k=[],l,n,m,p;for(e=0;0x100>e;e++)k[(h[e]=e<<1^283*(e>>7))^e]=e;for(f=g=0;!c[f];f^=l||1,g=k[g]||1)for(m=g^g<<1^g<<2^g<<3^g<<4,m=m>>8^m&255^99,c[f]=m,d[m]=f,n=h[e=h[l=h[f]]],p=0x1010101*n^0x10001*e^0x101*l^0x1010100*f,n=0x101*h[m]^0x1010100*m,e=0;4>e;e++)a[e][f]=n=n<<24^n>>>8,b[e][m]=p=p<<24^p>>>8;for(e=
0;5>e;e++)a[e]=a[e].slice(0),b[e]=b[e].slice(0)}};
function t(a,b,c){if(4!==b.length)throw new sjcl.exception.invalid("invalid aes block size");var d=a.b[c],e=b[0]^d[0],f=b[c?3:1]^d[1],g=b[2]^d[2];b=b[c?1:3]^d[3];var h,k,l,n=d.length/4-2,m,p=4,r=[0,0,0,0];h=a.s[c];a=h[0];var q=h[1],v=h[2],w=h[3],x=h[4];for(m=0;m<n;m++)h=a[e>>>24]^q[f>>16&255]^v[g>>8&255]^w[b&255]^d[p],k=a[f>>>24]^q[g>>16&255]^v[b>>8&255]^w[e&255]^d[p+1],l=a[g>>>24]^q[b>>16&255]^v[e>>8&255]^w[f&255]^d[p+2],b=a[b>>>24]^q[e>>16&255]^v[f>>8&255]^w[g&255]^d[p+3],p+=4,e=h,f=k,g=l;for(m=
0;4>m;m++)r[c?3&-m:m]=x[e>>>24]<<24^x[f>>16&255]<<16^x[g>>8&255]<<8^x[b&255]^d[p++],h=e,e=f,f=g,g=b,b=h;return r}
sjcl.bitArray={bitSlice:function(a,b,c){a=sjcl.bitArray.$(a.slice(b/32),32-(b&31)).slice(1);return void 0===c?a:sjcl.bitArray.clamp(a,c-b)},extract:function(a,b,c){var d=Math.floor(-b-c&31);return((b+c-1^b)&-32?a[b/32|0]<<32-d^a[b/32+1|0]>>>d:a[b/32|0]>>>d)&(1<<c)-1},concat:function(a,b){if(0===a.length||0===b.length)return a.concat(b);var c=a[a.length-1],d=sjcl.bitArray.getPartial(c);return 32===d?a.concat(b):sjcl.bitArray.$(b,d,c|0,a.slice(0,a.length-1))},bitLength:function(a){var b=a.length;return 0===
b?0:32*(b-1)+sjcl.bitArray.getPartial(a[b-1])},clamp:function(a,b){if(32*a.length<b)return a;a=a.slice(0,Math.ceil(b/32));var c=a.length;b=b&31;0<c&&b&&(a[c-1]=sjcl.bitArray.partial(b,a[c-1]&2147483648>>b-1,1));return a},partial:function(a,b,c){return 32===a?b:(c?b|0:b<<32-a)+0x10000000000*a},getPartial:function(a){return Math.round(a/0x10000000000)||32},equal:function(a,b){if(sjcl.bitArray.bitLength(a)!==sjcl.bitArray.bitLength(b))return!1;var c=0,d;for(d=0;d<a.length;d++)c|=a[d]^b[d];return 0===
c},$:function(a,b,c,d){var e;e=0;for(void 0===d&&(d=[]);32<=b;b-=32)d.push(c),c=0;if(0===b)return d.concat(a);for(e=0;e<a.length;e++)d.push(c|a[e]>>>b),c=a[e]<<32-b;e=a.length?a[a.length-1]:0;a=sjcl.bitArray.getPartial(e);d.push(sjcl.bitArray.partial(b+a&31,32<b+a?c:d.pop(),1));return d},i:function(a,b){return[a[0]^b[0],a[1]^b[1],a[2]^b[2],a[3]^b[3]]},byteswapM:function(a){var b,c;for(b=0;b<a.length;++b)c=a[b],a[b]=c>>>24|c>>>8&0xff00|(c&0xff00)<<8|c<<24;return a}};
sjcl.codec.utf8String={fromBits:function(a){var b="",c=sjcl.bitArray.bitLength(a),d,e;for(d=0;d<c/8;d++)0===(d&3)&&(e=a[d/4]),b+=String.fromCharCode(e>>>24),e<<=8;return decodeURIComponent(escape(b))},toBits:function(a){a=unescape(encodeURIComponent(a));var b=[],c,d=0;for(c=0;c<a.length;c++)d=d<<8|a.charCodeAt(c),3===(c&3)&&(b.push(d),d=0);c&3&&b.push(sjcl.bitArray.partial(8*(c&3),d));return b}};
sjcl.codec.hex={fromBits:function(a){var b="",c;for(c=0;c<a.length;c++)b+=((a[c]|0)+0xf00000000000).toString(16).substr(4);return b.substr(0,sjcl.bitArray.bitLength(a)/4)},toBits:function(a){var b,c=[],d;a=a.replace(/\s|0x/g,"");d=a.length;a=a+"00000000";for(b=0;b<a.length;b+=8)c.push(parseInt(a.substr(b,8),16)^0);return sjcl.bitArray.clamp(c,4*d)}};
sjcl.codec.base32={B:"ABCDEFGHIJKLMNOPQRSTUVWXYZ234567",X:"0123456789ABCDEFGHIJKLMNOPQRSTUV",BITS:32,BASE:5,REMAINING:27,fromBits:function(a,b,c){var d=sjcl.codec.base32.BASE,e=sjcl.codec.base32.REMAINING,f="",g=0,h=sjcl.codec.base32.B,k=0,l=sjcl.bitArray.bitLength(a);c&&(h=sjcl.codec.base32.X);for(c=0;f.length*d<l;)f+=h.charAt((k^a[c]>>>g)>>>e),g<d?(k=a[c]<<d-g,g+=e,c++):(k<<=d,g-=d);for(;f.length&7&&!b;)f+="=";return f},toBits:function(a,b){a=a.replace(/\s|=/g,"").toUpperCase();var c=sjcl.codec.base32.BITS,
d=sjcl.codec.base32.BASE,e=sjcl.codec.base32.REMAINING,f=[],g,h=0,k=sjcl.codec.base32.B,l=0,n,m="base32";b&&(k=sjcl.codec.base32.X,m="base32hex");for(g=0;g<a.length;g++){n=k.indexOf(a.charAt(g));if(0>n){if(!b)try{return sjcl.codec.base32hex.toBits(a)}catch(p){}throw new sjcl.exception.invalid("this isn't "+m+"!");}h>e?(h-=e,f.push(l^n>>>h),l=n<<c-h):(h+=d,l^=n<<c-h)}h&56&&f.push(sjcl.bitArray.partial(h&56,l,1));return f}};
sjcl.codec.base32hex={fromBits:function(a,b){return sjcl.codec.base32.fromBits(a,b,1)},toBits:function(a){return sjcl.codec.base32.toBits(a,1)}};
sjcl.codec.base64={B:"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/",fromBits:function(a,b,c){var d="",e=0,f=sjcl.codec.base64.B,g=0,h=sjcl.bitArray.bitLength(a);c&&(f=f.substr(0,62)+"-_");for(c=0;6*d.length<h;)d+=f.charAt((g^a[c]>>>e)>>>26),6>e?(g=a[c]<<6-e,e+=26,c++):(g<<=6,e-=6);for(;d.length&3&&!b;)d+="=";return d},toBits:function(a,b){a=a.replace(/\s|=/g,"");var c=[],d,e=0,f=sjcl.codec.base64.B,g=0,h;b&&(f=f.substr(0,62)+"-_");for(d=0;d<a.length;d++){h=f.indexOf(a.charAt(d));
if(0>h)throw new sjcl.exception.invalid("this isn't base64!");26<e?(e-=26,c.push(g^h>>>e),g=h<<32-e):(e+=6,g^=h<<32-e)}e&56&&c.push(sjcl.bitArray.partial(e&56,g,1));return c}};sjcl.codec.base64url={fromBits:function(a){return sjcl.codec.base64.fromBits(a,1,1)},toBits:function(a){return sjcl.codec.base64.toBits(a,1)}};sjcl.hash.sha256=function(a){this.b[0]||this.O();a?(this.F=a.F.slice(0),this.A=a.A.slice(0),this.l=a.l):this.reset()};sjcl.hash.sha256.hash=function(a){return(new sjcl.hash.sha256).update(a).finalize()};
sjcl.hash.sha256.prototype={blockSize:512,reset:function(){this.F=this.Y.slice(0);this.A=[];this.l=0;return this},update:function(a){"string"===typeof a&&(a=sjcl.codec.utf8String.toBits(a));var b,c=this.A=sjcl.bitArray.concat(this.A,a);b=this.l;a=this.l=b+sjcl.bitArray.bitLength(a);if(0x1fffffffffffff<a)throw new sjcl.exception.invalid("Cannot hash more than 2^53 - 1 bits");if("undefined"!==typeof Uint32Array){var d=new Uint32Array(c),e=0;for(b=512+b-(512+b&0x1ff);b<=a;b+=512)u(this,d.subarray(16*e,
16*(e+1))),e+=1;c.splice(0,16*e)}else for(b=512+b-(512+b&0x1ff);b<=a;b+=512)u(this,c.splice(0,16));return this},finalize:function(){var a,b=this.A,c=this.F,b=sjcl.bitArray.concat(b,[sjcl.bitArray.partial(1,1)]);for(a=b.length+2;a&15;a++)b.push(0);b.push(Math.floor(this.l/0x100000000));for(b.push(this.l|0);b.length;)u(this,b.splice(0,16));this.reset();return c},Y:[],b:[],O:function(){function a(a){return 0x100000000*(a-Math.floor(a))|0}for(var b=0,c=2,d,e;64>b;c++){e=!0;for(d=2;d*d<=c;d++)if(0===c%d){e=
!1;break}e&&(8>b&&(this.Y[b]=a(Math.pow(c,.5))),this.b[b]=a(Math.pow(c,1/3)),b++)}}};
function u(a,b){var c,d,e,f=a.F,g=a.b,h=f[0],k=f[1],l=f[2],n=f[3],m=f[4],p=f[5],r=f[6],q=f[7];for(c=0;64>c;c++)16>c?d=b[c]:(d=b[c+1&15],e=b[c+14&15],d=b[c&15]=(d>>>7^d>>>18^d>>>3^d<<25^d<<14)+(e>>>17^e>>>19^e>>>10^e<<15^e<<13)+b[c&15]+b[c+9&15]|0),d=d+q+(m>>>6^m>>>11^m>>>25^m<<26^m<<21^m<<7)+(r^m&(p^r))+g[c],q=r,r=p,p=m,m=n+d|0,n=l,l=k,k=h,h=d+(k&l^n&(k^l))+(k>>>2^k>>>13^k>>>22^k<<30^k<<19^k<<10)|0;f[0]=f[0]+h|0;f[1]=f[1]+k|0;f[2]=f[2]+l|0;f[3]=f[3]+n|0;f[4]=f[4]+m|0;f[5]=f[5]+p|0;f[6]=f[6]+r|0;f[7]=
f[7]+q|0}
sjcl.mode.ccm={name:"ccm",G:[],listenProgress:function(a){sjcl.mode.ccm.G.push(a)},unListenProgress:function(a){a=sjcl.mode.ccm.G.indexOf(a);-1<a&&sjcl.mode.ccm.G.splice(a,1)},fa:function(a){var b=sjcl.mode.ccm.G.slice(),c;for(c=0;c<b.length;c+=1)b[c](a)},encrypt:function(a,b,c,d,e){var f,g=b.slice(0),h=sjcl.bitArray,k=h.bitLength(c)/8,l=h.bitLength(g)/8;e=e||64;d=d||[];if(7>k)throw new sjcl.exception.invalid("ccm: iv must be at least 7 bytes");for(f=2;4>f&&l>>>8*f;f++);f<15-k&&(f=15-k);c=h.clamp(c,
8*(15-f));b=sjcl.mode.ccm.V(a,b,c,d,e,f);g=sjcl.mode.ccm.C(a,g,c,b,e,f);return h.concat(g.data,g.tag)},decrypt:function(a,b,c,d,e){e=e||64;d=d||[];var f=sjcl.bitArray,g=f.bitLength(c)/8,h=f.bitLength(b),k=f.clamp(b,h-e),l=f.bitSlice(b,h-e),h=(h-e)/8;if(7>g)throw new sjcl.exception.invalid("ccm: iv must be at least 7 bytes");for(b=2;4>b&&h>>>8*b;b++);b<15-g&&(b=15-g);c=f.clamp(c,8*(15-b));k=sjcl.mode.ccm.C(a,k,c,l,e,b);a=sjcl.mode.ccm.V(a,k.data,c,d,e,b);if(!f.equal(k.tag,a))throw new sjcl.exception.corrupt("ccm: tag doesn't match");
return k.data},na:function(a,b,c,d,e,f){var g=[],h=sjcl.bitArray,k=h.i;d=[h.partial(8,(b.length?64:0)|d-2<<2|f-1)];d=h.concat(d,c);d[3]|=e;d=a.encrypt(d);if(b.length)for(c=h.bitLength(b)/8,65279>=c?g=[h.partial(16,c)]:0xffffffff>=c&&(g=h.concat([h.partial(16,65534)],[c])),g=h.concat(g,b),b=0;b<g.length;b+=4)d=a.encrypt(k(d,g.slice(b,b+4).concat([0,0,0])));return d},V:function(a,b,c,d,e,f){var g=sjcl.bitArray,h=g.i;e/=8;if(e%2||4>e||16<e)throw new sjcl.exception.invalid("ccm: invalid tag length");
if(0xffffffff<d.length||0xffffffff<b.length)throw new sjcl.exception.bug("ccm: can't deal with 4GiB or more data");c=sjcl.mode.ccm.na(a,d,c,e,g.bitLength(b)/8,f);for(d=0;d<b.length;d+=4)c=a.encrypt(h(c,b.slice(d,d+4).concat([0,0,0])));return g.clamp(c,8*e)},C:function(a,b,c,d,e,f){var g,h=sjcl.bitArray;g=h.i;var k=b.length,l=h.bitLength(b),n=k/50,m=n;c=h.concat([h.partial(8,f-1)],c).concat([0,0,0]).slice(0,4);d=h.bitSlice(g(d,a.encrypt(c)),0,e);if(!k)return{tag:d,data:[]};for(g=0;g<k;g+=4)g>n&&(sjcl.mode.ccm.fa(g/
k),n+=m),c[3]++,e=a.encrypt(c),b[g]^=e[0],b[g+1]^=e[1],b[g+2]^=e[2],b[g+3]^=e[3];return{tag:d,data:h.clamp(b,l)}}};
sjcl.mode.ocb2={name:"ocb2",encrypt:function(a,b,c,d,e,f){if(128!==sjcl.bitArray.bitLength(c))throw new sjcl.exception.invalid("ocb iv must be 128 bits");var g,h=sjcl.mode.ocb2.S,k=sjcl.bitArray,l=k.i,n=[0,0,0,0];c=h(a.encrypt(c));var m,p=[];d=d||[];e=e||64;for(g=0;g+4<b.length;g+=4)m=b.slice(g,g+4),n=l(n,m),p=p.concat(l(c,a.encrypt(l(c,m)))),c=h(c);m=b.slice(g);b=k.bitLength(m);g=a.encrypt(l(c,[0,0,0,b]));m=k.clamp(l(m.concat([0,0,0]),g),b);n=l(n,l(m.concat([0,0,0]),g));n=a.encrypt(l(n,l(c,h(c))));
d.length&&(n=l(n,f?d:sjcl.mode.ocb2.pmac(a,d)));return p.concat(k.concat(m,k.clamp(n,e)))},decrypt:function(a,b,c,d,e,f){if(128!==sjcl.bitArray.bitLength(c))throw new sjcl.exception.invalid("ocb iv must be 128 bits");e=e||64;var g=sjcl.mode.ocb2.S,h=sjcl.bitArray,k=h.i,l=[0,0,0,0],n=g(a.encrypt(c)),m,p,r=sjcl.bitArray.bitLength(b)-e,q=[];d=d||[];for(c=0;c+4<r/32;c+=4)m=k(n,a.decrypt(k(n,b.slice(c,c+4)))),l=k(l,m),q=q.concat(m),n=g(n);p=r-32*c;m=a.encrypt(k(n,[0,0,0,p]));m=k(m,h.clamp(b.slice(c),p).concat([0,
0,0]));l=k(l,m);l=a.encrypt(k(l,k(n,g(n))));d.length&&(l=k(l,f?d:sjcl.mode.ocb2.pmac(a,d)));if(!h.equal(h.clamp(l,e),h.bitSlice(b,r)))throw new sjcl.exception.corrupt("ocb: tag doesn't match");return q.concat(h.clamp(m,p))},pmac:function(a,b){var c,d=sjcl.mode.ocb2.S,e=sjcl.bitArray,f=e.i,g=[0,0,0,0],h=a.encrypt([0,0,0,0]),h=f(h,d(d(h)));for(c=0;c+4<b.length;c+=4)h=d(h),g=f(g,a.encrypt(f(h,b.slice(c,c+4))));c=b.slice(c);128>e.bitLength(c)&&(h=f(h,d(h)),c=e.concat(c,[-2147483648,0,0,0]));g=f(g,c);
return a.encrypt(f(d(f(h,d(h))),g))},S:function(a){return[a[0]<<1^a[1]>>>31,a[1]<<1^a[2]>>>31,a[2]<<1^a[3]>>>31,a[3]<<1^135*(a[0]>>>31)]}};
sjcl.mode.gcm={name:"gcm",encrypt:function(a,b,c,d,e){var f=b.slice(0);b=sjcl.bitArray;d=d||[];a=sjcl.mode.gcm.C(!0,a,f,d,c,e||128);return b.concat(a.data,a.tag)},decrypt:function(a,b,c,d,e){var f=b.slice(0),g=sjcl.bitArray,h=g.bitLength(f);e=e||128;d=d||[];e<=h?(b=g.bitSlice(f,h-e),f=g.bitSlice(f,0,h-e)):(b=f,f=[]);a=sjcl.mode.gcm.C(!1,a,f,d,c,e);if(!g.equal(a.tag,b))throw new sjcl.exception.corrupt("gcm: tag doesn't match");return a.data},ka:function(a,b){var c,d,e,f,g,h=sjcl.bitArray.i;e=[0,0,
0,0];f=b.slice(0);for(c=0;128>c;c++){(d=0!==(a[Math.floor(c/32)]&1<<31-c%32))&&(e=h(e,f));g=0!==(f[3]&1);for(d=3;0<d;d--)f[d]=f[d]>>>1|(f[d-1]&1)<<31;f[0]>>>=1;g&&(f[0]^=-0x1f000000)}return e},j:function(a,b,c){var d,e=c.length;b=b.slice(0);for(d=0;d<e;d+=4)b[0]^=0xffffffff&c[d],b[1]^=0xffffffff&c[d+1],b[2]^=0xffffffff&c[d+2],b[3]^=0xffffffff&c[d+3],b=sjcl.mode.gcm.ka(b,a);return b},C:function(a,b,c,d,e,f){var g,h,k,l,n,m,p,r,q=sjcl.bitArray;m=c.length;p=q.bitLength(c);r=q.bitLength(d);h=q.bitLength(e);
g=b.encrypt([0,0,0,0]);96===h?(e=e.slice(0),e=q.concat(e,[1])):(e=sjcl.mode.gcm.j(g,[0,0,0,0],e),e=sjcl.mode.gcm.j(g,e,[0,0,Math.floor(h/0x100000000),h&0xffffffff]));h=sjcl.mode.gcm.j(g,[0,0,0,0],d);n=e.slice(0);d=h.slice(0);a||(d=sjcl.mode.gcm.j(g,h,c));for(l=0;l<m;l+=4)n[3]++,k=b.encrypt(n),c[l]^=k[0],c[l+1]^=k[1],c[l+2]^=k[2],c[l+3]^=k[3];c=q.clamp(c,p);a&&(d=sjcl.mode.gcm.j(g,h,c));a=[Math.floor(r/0x100000000),r&0xffffffff,Math.floor(p/0x100000000),p&0xffffffff];d=sjcl.mode.gcm.j(g,d,a);k=b.encrypt(e);
d[0]^=k[0];d[1]^=k[1];d[2]^=k[2];d[3]^=k[3];return{tag:q.bitSlice(d,0,f),data:c}}};sjcl.misc.hmac=function(a,b){this.W=b=b||sjcl.hash.sha256;var c=[[],[]],d,e=b.prototype.blockSize/32;this.w=[new b,new b];a.length>e&&(a=b.hash(a));for(d=0;d<e;d++)c[0][d]=a[d]^909522486,c[1][d]=a[d]^1549556828;this.w[0].update(c[0]);this.w[1].update(c[1]);this.R=new b(this.w[0])};
sjcl.misc.hmac.prototype.encrypt=sjcl.misc.hmac.prototype.mac=function(a){if(this.aa)throw new sjcl.exception.invalid("encrypt on already updated hmac called!");this.update(a);return this.digest(a)};sjcl.misc.hmac.prototype.reset=function(){this.R=new this.W(this.w[0]);this.aa=!1};sjcl.misc.hmac.prototype.update=function(a){this.aa=!0;this.R.update(a)};sjcl.misc.hmac.prototype.digest=function(){var a=this.R.finalize(),a=(new this.W(this.w[1])).update(a).finalize();this.reset();return a};
sjcl.misc.pbkdf2=function(a,b,c,d,e){c=c||1E4;if(0>d||0>c)throw new sjcl.exception.invalid("invalid params to pbkdf2");"string"===typeof a&&(a=sjcl.codec.utf8String.toBits(a));"string"===typeof b&&(b=sjcl.codec.utf8String.toBits(b));e=e||sjcl.misc.hmac;a=new e(a);var f,g,h,k,l=[],n=sjcl.bitArray;for(k=1;32*l.length<(d||1);k++){e=f=a.encrypt(n.concat(b,[k]));for(g=1;g<c;g++)for(f=a.encrypt(f),h=0;h<f.length;h++)e[h]^=f[h];l=l.concat(e)}d&&(l=n.clamp(l,d));return l};
sjcl.prng=function(a){this.c=[new sjcl.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=a;this.D=!1;this.K={progress:{},seeded:{}};this.u=this.ga=0;this.I=1;this.J=2;this.ca=0x10000;this.T=[0,48,64,96,128,192,0x100,384,512,768,1024];this.da=3E4;this.ba=80};
sjcl.prng.prototype={randomWords:function(a,b){var c=[],d;d=this.isReady(b);var e;if(d===this.u)throw new sjcl.exception.notReady("generator isn't seeded");if(d&this.J){d=!(d&this.I);e=[];var f=0,g;this.Z=e[0]=(new Date).valueOf()+this.da;for(g=0;16>g;g++)e.push(0x100000000*Math.random()|0);for(g=0;g<this.c.length&&(e=e.concat(this.c[g].finalize()),f+=this.m[g],this.m[g]=0,d||!(this.P&1<<g));g++);this.P>=1<<this.c.length&&(this.c.push(new sjcl.hash.sha256),this.m.push(0));this.f-=f;f>this.o&&(this.o=
f);this.P++;this.b=sjcl.hash.sha256.hash(this.b.concat(e));this.L=new sjcl.cipher.aes(this.b);for(d=0;4>d&&(this.h[d]=this.h[d]+1|0,!this.h[d]);d++);}for(d=0;d<a;d+=4)0===(d+1)%this.ca&&y(this),e=z(this),c.push(e[0],e[1],e[2],e[3]);y(this);return c.slice(0,a)},setDefaultParanoia:function(a,b){if(0===a&&"Setting paranoia=0 will ruin your security; use it only for testing"!==b)throw new sjcl.exception.invalid("Setting paranoia=0 will ruin your security; use it only for testing");this.M=a},addEntropy:function(a,
b,c){c=c||"user";var d,e,f=(new Date).valueOf(),g=this.H[c],h=this.isReady(),k=0;d=this.U[c];void 0===d&&(d=this.U[c]=this.ha++);void 0===g&&(g=this.H[c]=0);this.H[c]=(this.H[c]+1)%this.c.length;switch(typeof a){case "number":void 0===b&&(b=1);this.c[g].update([d,this.N++,1,b,f,1,a|0]);break;case "object":c=Object.prototype.toString.call(a);if("[object Uint32Array]"===c){e=[];for(c=0;c<a.length;c++)e.push(a[c]);a=e}else for("[object Array]"!==c&&(k=1),c=0;c<a.length&&!k;c++)"number"!==typeof a[c]&&
(k=1);if(!k){if(void 0===b)for(c=b=0;c<a.length;c++)for(e=a[c];0<e;)b++,e=e>>>1;this.c[g].update([d,this.N++,2,b,f,a.length].concat(a))}break;case "string":void 0===b&&(b=a.length);this.c[g].update([d,this.N++,3,b,f,a.length]);this.c[g].update(a);break;default:k=1}if(k)throw new sjcl.exception.bug("random: addEntropy only supports number, array of numbers or string");this.m[g]+=b;this.f+=b;h===this.u&&(this.isReady()!==this.u&&A("seeded",Math.max(this.o,this.f)),A("progress",this.getProgress()))},
isReady:function(a){a=this.T[void 0!==a?a:this.M];return this.o&&this.o>=a?this.m[0]>this.ba&&(new Date).valueOf()>this.Z?this.J|this.I:this.I:this.f>=a?this.J|this.u:this.u},getProgress:function(a){a=this.T[a?a:this.M];return this.o>=a?1:this.f>a?1:this.f/a},startCollectors:function(){if(!this.D){this.a={loadTimeCollector:B(this,this.ma),mouseCollector:B(this,this.oa),keyboardCollector:B(this,this.la),accelerometerCollector:B(this,this.ea),touchCollector:B(this,this.qa)};if(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)document.attachEvent("onload",this.a.loadTimeCollector),document.attachEvent("onmousemove",this.a.mouseCollector),document.attachEvent("keypress",this.a.keyboardCollector);else throw new sjcl.exception.bug("can't attach event");
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(a,b){this.K[a][this.ga++]=b},removeEventListener:function(a,b){var c,d,e=this.K[a],f=[];for(d in e)e.hasOwnProperty(d)&&e[d]===b&&f.push(d);for(c=0;c<f.length;c++)d=f[c],delete e[d]},la:function(){C(this,1)},oa:function(a){var b,c;try{b=a.x||a.clientX||a.offsetX||0,c=a.y||a.clientY||a.offsetY||0}catch(d){c=b=0}0!=b&&0!=c&&this.addEntropy([b,c],2,"mouse");C(this,0)},qa:function(a){a=
a.touches[0]||a.changedTouches[0];this.addEntropy([a.pageX||a.clientX,a.pageY||a.clientY],1,"touch");C(this,0)},ma:function(){C(this,2)},ea:function(a){a=a.accelerationIncludingGravity.x||a.accelerationIncludingGravity.y||a.accelerationIncludingGravity.z;if(window.orientation){var b=window.orientation;"number"===typeof b&&this.addEntropy(b,1,"accelerometer")}a&&this.addEntropy(a,2,"accelerometer");C(this,0)}};
function A(a,b){var c,d=sjcl.random.K[a],e=[];for(c in d)d.hasOwnProperty(c)&&e.push(d[c]);for(c=0;c<e.length;c++)e[c](b)}function C(a,b){"undefined"!==typeof window&&window.performance&&"function"===typeof window.performance.now?a.addEntropy(window.performance.now(),b,"loadtime"):a.addEntropy((new Date).valueOf(),b,"loadtime")}function y(a){a.b=z(a).concat(z(a));a.L=new sjcl.cipher.aes(a.b)}function z(a){for(var b=0;4>b&&(a.h[b]=a.h[b]+1|0,!a.h[b]);b++);return a.L.encrypt(a.h)}
function B(a,b){return function(){b.apply(a,arguments)}}sjcl.random=new sjcl.prng(6);
a:try{var D,E,F,G;if(G="undefined"!==typeof module&&module.exports){var H;try{H=require("crypto")}catch(a){H=null}G=E=H}if(G&&E.randomBytes)D=E.randomBytes(128),D=new Uint32Array((new Uint8Array(D)).buffer),sjcl.random.addEntropy(D,1024,"crypto['randomBytes']");else if("undefined"!==typeof window&&"undefined"!==typeof Uint32Array){F=new Uint32Array(32);if(window.crypto&&window.crypto.getRandomValues)window.crypto.getRandomValues(F);else if(window.msCrypto&&window.msCrypto.getRandomValues)window.msCrypto.getRandomValues(F);
else break a;sjcl.random.addEntropy(F,1024,"crypto['getRandomValues']")}}catch(a){"undefined"!==typeof window&&window.console&&(console.log("There was an error collecting entropy from the browser:"),console.log(a))}
sjcl.json={defaults:{v:1,iter:1E4,ks:128,ts:64,mode:"ccm",adata:"",cipher:"aes"},ja:function(a,b,c,d){c=c||{};d=d||{};var e=sjcl.json,f=e.g({iv:sjcl.random.randomWords(4,0)},e.defaults),g;e.g(f,c);c=f.adata;"string"===typeof f.salt&&(f.salt=sjcl.codec.base64.toBits(f.salt));"string"===typeof f.iv&&(f.iv=sjcl.codec.base64.toBits(f.iv));if(!sjcl.mode[f.mode]||!sjcl.cipher[f.cipher]||"string"===typeof a&&100>=f.iter||64!==f.ts&&96!==f.ts&&128!==f.ts||128!==f.ks&&192!==f.ks&&0x100!==f.ks||2>f.iv.length||
4<f.iv.length)throw new sjcl.exception.invalid("json encrypt: invalid parameters");"string"===typeof a?(g=sjcl.misc.cachedPbkdf2(a,f),a=g.key.slice(0,f.ks/32),f.salt=g.salt):sjcl.ecc&&a instanceof sjcl.ecc.elGamal.publicKey&&(g=a.kem(),f.kemtag=g.tag,a=g.key.slice(0,f.ks/32));"string"===typeof b&&(b=sjcl.codec.utf8String.toBits(b));"string"===typeof c&&(f.adata=c=sjcl.codec.utf8String.toBits(c));g=new sjcl.cipher[f.cipher](a);e.g(d,f);d.key=a;f.ct="ccm"===f.mode&&sjcl.arrayBuffer&&sjcl.arrayBuffer.ccm&&
b instanceof ArrayBuffer?sjcl.arrayBuffer.ccm.encrypt(g,b,f.iv,c,f.ts):sjcl.mode[f.mode].encrypt(g,b,f.iv,c,f.ts);return f},encrypt:function(a,b,c,d){var e=sjcl.json,f=e.ja.apply(e,arguments);return e.encode(f)},ia:function(a,b,c,d){c=c||{};d=d||{};var e=sjcl.json;b=e.g(e.g(e.g({},e.defaults),b),c,!0);var f,g;f=b.adata;"string"===typeof b.salt&&(b.salt=sjcl.codec.base64.toBits(b.salt));"string"===typeof b.iv&&(b.iv=sjcl.codec.base64.toBits(b.iv));if(!sjcl.mode[b.mode]||!sjcl.cipher[b.cipher]||"string"===
typeof a&&100>=b.iter||64!==b.ts&&96!==b.ts&&128!==b.ts||128!==b.ks&&192!==b.ks&&0x100!==b.ks||!b.iv||2>b.iv.length||4<b.iv.length)throw new sjcl.exception.invalid("json decrypt: invalid parameters");"string"===typeof a?(g=sjcl.misc.cachedPbkdf2(a,b),a=g.key.slice(0,b.ks/32),b.salt=g.salt):sjcl.ecc&&a instanceof sjcl.ecc.elGamal.secretKey&&(a=a.unkem(sjcl.codec.base64.toBits(b.kemtag)).slice(0,b.ks/32));"string"===typeof f&&(f=sjcl.codec.utf8String.toBits(f));g=new sjcl.cipher[b.cipher](a);f="ccm"===
b.mode&&sjcl.arrayBuffer&&sjcl.arrayBuffer.ccm&&b.ct instanceof ArrayBuffer?sjcl.arrayBuffer.ccm.decrypt(g,b.ct,b.iv,b.tag,f,b.ts):sjcl.mode[b.mode].decrypt(g,b.ct,b.iv,f,b.ts);e.g(d,b);d.key=a;return 1===c.raw?f:sjcl.codec.utf8String.fromBits(f)},decrypt:function(a,b,c,d){var e=sjcl.json;return e.ia(a,e.decode(b),c,d)},encode:function(a){var b,c="{",d="";for(b in a)if(a.hasOwnProperty(b)){if(!b.match(/^[a-z0-9]+$/i))throw new sjcl.exception.invalid("json encode: invalid property name");c+=d+'"'+
b+'":';d=",";switch(typeof a[b]){case "number":case "boolean":c+=a[b];break;case "string":c+='"'+escape(a[b])+'"';break;case "object":c+='"'+sjcl.codec.base64.fromBits(a[b],0)+'"';break;default:throw new sjcl.exception.bug("json encode: unsupported type");}}return c+"}"},decode:function(a){a=a.replace(/\s/g,"");if(!a.match(/^\{.*\}$/))throw new sjcl.exception.invalid("json decode: this isn't json!");a=a.replace(/^\{|\}$/g,"").split(/,/);var b={},c,d;for(c=0;c<a.length;c++){if(!(d=a[c].match(/^\s*(?:(["']?)([a-z][a-z0-9]*)\1)\s*:\s*(?:(-?\d+)|"([a-z0-9+\/%*_.@=\-]*)"|(true|false))$/i)))throw new sjcl.exception.invalid("json decode: this isn't json!");
null!=d[3]?b[d[2]]=parseInt(d[3],10):null!=d[4]?b[d[2]]=d[2].match(/^(ct|adata|salt|iv)$/)?sjcl.codec.base64.toBits(d[4]):unescape(d[4]):null!=d[5]&&(b[d[2]]="true"===d[5])}return b},g:function(a,b,c){void 0===a&&(a={});if(void 0===b)return a;for(var d in b)if(b.hasOwnProperty(d)){if(c&&void 0!==a[d]&&a[d]!==b[d])throw new sjcl.exception.invalid("required parameter overridden");a[d]=b[d]}return a},sa:function(a,b){var c={},d;for(d in a)a.hasOwnProperty(d)&&a[d]!==b[d]&&(c[d]=a[d]);return c},ra:function(a,
b){var c={},d;for(d=0;d<b.length;d++)void 0!==a[b[d]]&&(c[b[d]]=a[b[d]]);return c}};sjcl.encrypt=sjcl.json.encrypt;sjcl.decrypt=sjcl.json.decrypt;sjcl.misc.pa={};sjcl.misc.cachedPbkdf2=function(a,b){var c=sjcl.misc.pa,d;b=b||{};d=b.iter||1E3;c=c[a]=c[a]||{};d=c[d]=c[d]||{firstSalt:b.salt&&b.salt.length?b.salt.slice(0):sjcl.random.randomWords(2,0)};c=void 0===b.salt?d.firstSalt:b.salt;d[c]=d[c]||sjcl.misc.pbkdf2(a,c,b.iter);return{key:d[c].slice(0),salt:c.slice(0)}};
"undefined"!==typeof module&&module.exports&&(module.exports=sjcl);"function"===typeof define&&define([],function(){return sjcl});

window.sjcl = sjcl;
//}}}
//{{{
// make plugin work with MainTiddlyServer and TW 2.8.1+
config.options.chkAvoidGranulatedSaving = true;

config.shadowTiddlers.SideBarOptions = config.shadowTiddlers.SideBarOptions.replace(
	/<<saveChanges>>/, "<<unlock>><<setPassword>><<saveChanges>>");
config.shadowTiddlers.GettingStarted +=
	"\n\n<<ifLocked 'This TiddlyWiki use EncryptedVaultPlugin. " +
	"To load protected content click on'>><<unlock>>" +
	"<<ifUnlocked 'This TiddlyWiki use EncryptedVaultPlugin. " +
	"To set or change password click on'>><<setPassword>>";

merge(config.messages, {
	vaultCreationInfo: "The encrypted vault has been created",
	passwordSet: "🔒 Successfully set password",
	passwordUnset: "🔓 Successfully unset password",
	purgeConfirm: "Purge the encrypted vault ?\n\nAll unlocked content will be lost.",
	vaultPurgedInfo: "All contents have been purged from encrypted vault.\nPassword has been blanked.\nYou must save once to apply this changes.",
	vaultEncryptedInfo: "Saving with encryption",
	vaultUnchangedInfo: "No changes in Encrypted vault",
	noLockedVaultNoPurge: "No locked encrypted vault, nothing to purge.",
	emptyVaultInfo: "Saving without encryption",
	saveWithLockedVaultConfirm: "Encrypted vault is locked. No changes will apply inside.\n\nAre you sure ?",
	confirmOverload: "This following tiddler already exists in system store. Overload ?\nOK : the encrypted version will replace the system store version\nCancel : the system store version will replace the encrypted version"
});

config.extensions = config.extensions || {}
config.extensions.vault = {
	// TODO: encapsulate sjcl from global context?
	callSjcl: function(method, inputText, password) {
		if(!password) return

		try {
			var outputText = window.sjcl[method](password, inputText)
		} catch(ex) {
			console.log("Crypto error: " + ex)
			return null
		}
		return outputText
	},
	// this constant string allows to distinguish whether some content
	// is encrypted with the algorithm used here
	// TODO: for updating the plugin in some TWs, detect old prefix (Cryptomx@) and warn
	prefix: "Sjcl@",
	encrypt: function(src, password) {
		if(!password) return src
		return this.prefix + this.callSjcl("encrypt", src, password)
	},
	// if a wrong password is used, returns src as is
	decrypt: function(src, password) {
		var res = this.callSjcl("decrypt", src.substr(this.prefix.length), password)
		return res || src
	},
	isEncrypted: function(src) {
		return src.substr(0, this.prefix.length) == this.prefix
	},

	// these should not be found by indexOf() of this source;
	// as < is encoded as &lt;, this won't happen anyway
	vaultAreaId: 'vaultArea',
	startSaveVaultArea: '<div id="vaultArea">',
	endSaveVaultArea: '</div>',
	postVaultAreaMarker: '<!--POST-VAULTAREA-->',

	// TODO: use this instead of createVaultArea, remove .. bits in updateOriginal
	// TODO: get rid of side-effects (alerts, displayMessage)
	addOrUpdateVaultArea: function(twHtml) {
		var posVault = this.locateVaultArea(twHtml)
		if(!posVault) {
			twHtml = this.createVaultArea(twHtml)
			alert(config.messages.vaultCreationInfo);
			posVault = this.locateVaultArea(twHtml)
			if(!posVault) alertAndThrow(
				config.messages.invalidFileError.format([localPath]));
		}

		var newVaultContent = !this.password ? "" :
			this.encrypt(store.allEncryptedTiddlersAsHtml(), this.password)
		var updatedHtml = twHtml.substr(0, posVault[0] + this.startSaveVaultArea.length) +
			convertUnicodeToUTF8(newVaultContent) +
			twHtml.substr(posVault[1])
		displayMessage(config.messages[this.password ?
			'vaultEncryptedInfo' : 'emptyVaultInfo'])
		return updatedHtml
	},
	createVaultArea: function(original) {
		var revised = original.replace(/<!--POST-SHADOWAREA-->/,
			'<!--POST-SHADOWAREA-->\n' +
			this.startSaveVaultArea + this.endSaveVaultArea + '\n' +
			this.postVaultAreaMarker)

		// TODO: insert into styleArea instead, use CSS comment as a marker
		// or even better add to PRE-HEAD
		var vaultStylesMarker = '<!--PRE-VAULTSTYLE-START-->'
		if(revised.indexOf(vaultStylesMarker) < 0) {
			var vaultStylesHtml = vaultStylesMarker + '\n<style type="text/css">\n' +
				'#'+ this.vaultAreaId +' { display: none; }' +
			'\n</style>\n<!--PRE-VAULTSTYLE-END-->\n'
			revised = revised.replace(/<!--POST-HEAD-START-->/,
				vaultStylesHtml + '<!--POST-HEAD-START-->')
		}

		return revised
	},
	// adapted from locateStoreArea
	locateVaultArea: function(original) {
		if(!original) return null

		// the vaultArea div should be just before the storeArea div
		var posOpeningDiv = original.indexOf(this.startSaveVaultArea)
		var limitClosingDiv = original.indexOf(this.postVaultAreaMarker)
		// startSaveArea is globally available (should be deprecated though)
		if(limitClosingDiv == -1)
			limitClosingDiv = original.indexOf(startSaveArea)
		var posClosingDiv = original.lastIndexOf(this.endSaveVaultArea, limitClosingDiv)

		return (posOpeningDiv == -1 || posClosingDiv == -1) ? null :
			[posOpeningDiv, posClosingDiv];
	},

	tagDontEncrypt: "unencrypted",
	tagForceEncrypt: "forceEncryption",
	getUnencryptedArray: function() {
		var unencryptedList = store.fetchTiddler("ListUnencrypted")
		if(!unencryptedList) return
		var filter = unencryptedList.text
		return store.filterTiddlers(filter)
	},
	// this is used to avoid quadratic complexity (filtering N tiddlers per each N tiddlers)
	unencryptedCacheMap: null,
	populateUnencryptedCacheMap: function() {
		var unencryptedArray = this.getUnencryptedArray()
		this.unencryptedCacheMap = {}
		for(var i = 0; i < unencryptedArray.length; i++) {
			var title = unencryptedArray[i].title
			this.unencryptedCacheMap[title] = true
		}
	},
	clearnUnencryptedCacheMap: function() {
		this.unencryptedCacheMap = null
	},
	shouldEncryptTiddler: function(tiddler) {
		if(tiddler.isTagged(this.tagForceEncrypt)) return true

		if(store.isShadowTiddler([tiddler.title])
		   || tiddler.title === "ListUnencrypted"
		   || tiddler.isTagged("systemConfig")
		   || tiddler.isTagged(this.tagDontEncrypt)
		) return false

		if(this.unencryptedCacheMap) {
			return !this.unencryptedCacheMap[tiddler.title]
		} else {
			var unencryptedArray = this.getUnencryptedArray()
			if(unencryptedArray && unencryptedArray.indexOf(tiddler) !== -1) return false
			/*var unencryptedList = store.fetchTiddler("ListUnencrypted")
			if(unencryptedList) {
				var filter = unencryptedList.text
				var tids = store.filterTiddlers(filter)
				if(tids.indexOf(tiddler) !== -1) return false
			}*/
		}

		return true
	},

	// TODO: review terms (locked, loaded, ..) – should be consistent
	getVaultContent: function() {
		var el = document.getElementById(this.vaultAreaId)
		return el ? el.innerHTML : null
	},
	// TODO: remove state; may be move some sections above to ~submodules instead
	// loaded: falsy by default (we don't set it so that installing twice won't hurt)
	isLocked: function() {
		if(this.loaded) return false
		var vaultContent = this.getVaultContent()
		return vaultContent === null || this.isEncrypted(vaultContent)
	},
	existsAndIsLocked: function() {
		return this.getVaultContent() !== null &&
			this.isLocked()
	},
	// TODO: fix lingo (missing, prompt); review
	// returns a boolean indicating success
	load: function() {
		if (!this.isLocked()) {
			// vaultAlreadyUnlockedWarning is missing even in the original plugin!
			alert(config.messages.vaultAlreadyUnlockedWarning);
			return false;
		}

		var vaultContent = this.getVaultContent()
		if(vaultContent === null) return false

		var pwd = this.password || "";
		while(this.isEncrypted(vaultContent) && (pwd != null)) {
			if(pwd) vaultContent = this.decrypt(vaultContent, pwd);
			if(this.isEncrypted(vaultContent))
				pwd = prompt("Enter a password", pwd);
		}
		if(pwd != null) this.password = pwd;
		if(this.isEncrypted(vaultContent)) return false;

		var wasDirty = store.isDirty();
		if(vaultContent) {
			var e = document.createElement("div");
			e.innerHTML = vaultContent;
			store.getLoader().loadTiddlers(store, e.childNodes);
		}
		this.loaded = true;
		refreshAll();
		story.refreshAllTiddlers();
		store.setDirty(wasDirty);
		return true
	},

	// TODO: expose password setter, but hide direct access to password, if possible
	// password: falsy by default

	// TODO: can we implement a method "purge" instead? review current logic:
	// seems to have multiple flaws (one is: it's never restored to false!)
	// Make sure installing twice won't hurt
	shouldPurge: false,

	// save for decorating; avoid problems if this is installed twice
	originals: config.extensions.vault ? config.extensions.vault.originals : {
		updateOriginal: updateOriginal,
		LoaderBase_loadTiddler: LoaderBase.prototype.loadTiddler,
		saveChanges: saveChanges,
		Tiddler_doNotSave: Tiddler.prototype.doNotSave
	}
}

// TODO: try `this` instead of `store`; why `TiddlyWiki.prototype.allTiddlersAsHtml` uses that?
TiddlyWiki.prototype.allUnencryptedTiddlersAsHtml = function() {
	Tiddler.prototype.doNotSave = function() {
		if(config.extensions.vault.shouldEncryptTiddler(this)) return true
		return config.extensions.vault.originals.Tiddler_doNotSave.apply(this, arguments)
	}

	var result = this.getSaver().externalize(store)
	
	Tiddler.prototype.doNotSave = config.extensions.vault.originals.Tiddler_doNotSave

	return result
}

TiddlyWiki.prototype.allEncryptedTiddlersAsHtml = function() {
	Tiddler.prototype.doNotSave = function() {
		if(!config.extensions.vault.shouldEncryptTiddler(this)) return true
		return config.extensions.vault.originals.Tiddler_doNotSave.apply(this, arguments)
	}

	var result = this.getSaver().externalize(store)
	
	Tiddler.prototype.doNotSave = config.extensions.vault.originals.Tiddler_doNotSave

	return result
}

// TODO: review all decorations; may be move (encapsulate) some bits to ceVault methods
// decorate
window.updateOriginal = function(original, posDiv) {
	var ceVault = config.extensions.vault
	var vaultIsUpdatable = !ceVault.locateVaultArea(original) ||
		!ceVault.isLocked() || ceVault.shouldPurge

	ceVault.populateUnencryptedCacheMap()
	var orig_allTiddlersAsHtml = store.allTiddlersAsHtml
	//# or decorate prototype?
	store.allTiddlersAsHtml = function() {
		return convertUnicodeToUTF8((vaultIsUpdatable && ceVault.password) ?
			this.allUnencryptedTiddlersAsHtml() :
			orig_allTiddlersAsHtml.apply(this, arguments))
	}

	var revised = ceVault.originals.updateOriginal.apply(this, arguments)
	if(vaultIsUpdatable) {
		// reports results via alert and/or displayMessage
		revised = ceVault.addOrUpdateVaultArea(revised)
	} else
		displayMessage(config.messages.vaultUnchangedInfo)

	store.allTiddlersAsHtml = orig_allTiddlersAsHtml
	ceVault.clearnUnencryptedCacheMap()

	return revised
}

// decorate
LoaderBase.prototype.loadTiddler = function(store, node, tiddlers) {
	var title = this.getTitle(store, node);
	if(store.getTiddler(title) && !confirm(config.messages.confirmOverload +"\n\n"+ title))
		return;
	return config.extensions.vault.originals.LoaderBase_loadTiddler.apply(this, arguments)
}

// decorate
window.saveChanges = function(onlyIfDirty, tiddlers) {
	var ceVault = config.extensions.vault
	if(ceVault.shouldPurge || !ceVault.existsAndIsLocked() ||
	   confirm(config.messages.saveWithLockedVaultConfirm))
		ceVault.originals.saveChanges.apply(this, arguments);
}

var shadowName = "StyleSheetVault"
if(!config.shadowTiddlers[shadowName]) {
	config.shadowTiddlers[shadowName] = 'input { max-width: 100%; }'
	store.addNotification(shadowName, refreshStyles)
	store.addNotification("ColorPalette", function(smth, doc) { refreshStyles(shadowName, doc) })
}

// TODO: move defaults to lingo
config.macros.unlock = {
	handler: function(place, macroName, params, wikifier, paramString, tiddler) {
		var form = createTiddlyElement(place, 'form')
		jQuery(form).attr({ refresh: "macro", macroName: macroName }).data({
			label:  	params[0] || "unlock vault",
			tooltip:	params[1] || "unlock encrypted vault",
			openTiddlers:	params[2] || "",
			closeTiddlers:	params[3] || "",
		})
		this.refresh(form)
	},
	refresh: function(form) {
		var params = jQuery(form).data()
		jQuery(form).empty()
		var macro = this
		var ceVault = config.extensions.vault

		//# or may be show something more helpful
		if(!ceVault.existsAndIsLocked()) return;

		var input = createTiddlyElement(form, 'input', null, null, null, {
			type: 'password'
		})
		input.focus()

		jQuery(input).on('keydown', function(event) {
			if(event.key !== 'Enter') return
			macro.unlockAndOpen(input.value,
				params.openTiddlers, params.closeTiddlers)
			return false
		})
		// TODO: explain they can type and press "enter"

		createTiddlyButton(form, params.label, params.tooltip, function() {
			macro.unlockAndOpen(input.value,
				params.openTiddlers, params.closeTiddlers)
			return false
		})
	},
	unlockAndOpen: function(newPassword, openTiddlersFilter, closeTiddlersFilter) {
		var ceVault = config.extensions.vault
		if(newPassword) ceVault.password = newPassword

		if(ceVault.load()) {
			if(closeTiddlersFilter) {
				var tiddlers = store.filterTiddlers(closeTiddlersFilter)
				for(var i = 0; i < tiddlers.length; i++) {
					if(!story.isDirty(tiddlers[i].title))
						story.closeTiddler(tiddlers[i].title)
				}
			}
			if(openTiddlersFilter) {
				var tiddlers = store.filterTiddlers(openTiddlersFilter)
				for(var i = 0; i < tiddlers.length; i++)
					story.displayTiddler("bottom", tiddlers[i].title)
			}
		}
	}
}

// TODO: move defaults to lingo
config.macros.setPassword = {
	handler: function(place, macroName, params, wikifier, paramString, tiddler) {
		var form = createTiddlyElement(place, 'form')
		jQuery(form).attr({ refresh: "macro", macroName: macroName }).data({
			label:   params[0] || "set password",
			tooltip: params[1] || "Set password for encrypted vault"
		})
		this.refresh(form)
	},
	refresh: function(form) {
		var params = jQuery(form).data()
		jQuery(form).empty()

		if(config.extensions.vault.isLocked()) return
		createTiddlyButton(form, params.label, params.tooltip, this.onClick)
	},
	onClick: function(event) {
		var form = event.target.parentElement
		jQuery(form).empty()
		var refreshForm = function() { config.macros.setPassword.refresh(form) }

		var input = createTiddlyElement(form, 'input', null, null, null, {
			type: 'password'
		})
		input.focus()

		var ceVault = config.extensions.vault
		jQuery(input).on('keydown', function(event) {
			if(event.key === 'Escape') return refreshForm()

			if(event.key !== 'Enter') return
			ceVault.password = input.value

			refreshForm()
			displayMessage(ceVault.password ?
				config.messages.passwordSet :
				config.messages.passwordUnset)
			return false
		})
		.on('blur', refreshForm)
		// TODO: explain they have to type and press "enter" and/or add a button for that
		// TODO: add also way to cancel (→ refresh form)

		return false;
	}
}

config.macros.purge = {
	handler: function(place, macroName, params, wikifier, paramString, tiddler) {
		var label   = params[0] || "purge vault";
		var tooltip = params[1] || "Delete locked vault";
		var ceVault = config.extensions.vault
		if (ceVault.existsAndIsLocked())
			createTiddlyButton(place, label, tooltip, this.onClick);
	},
	onClick: function() {
		var ceVault = config.extensions.vault
		if (!ceVault.isLocked())
			alert(config.messages.noLockedVaultNoPurge);
		else
			if(confirm(config.messages.purgeConfirm)) {
				ceVault.shouldPurge = true;
				alert(config.messages.vaultPurgedInfo);
			}
		return false;
	}
}

config.macros.ifLocked = {
	handler: function(place, macroName, params, wikifier, paramString, tiddler) {
		if(config.extensions.vault.existsAndIsLocked())
			wikify(params[0], place, null, tiddler);
	}
}

config.macros.ifUnlocked = {
	handler: function(place, macroName, params, wikifier, paramString, tiddler) {
		if(config.extensions.vault.isLocked()) return;
		wikify(params[0], place, null, tiddler);
	}
}
//}}}