check code integrity of JS files for ZeroBin

check_minified.js

function getSource(a){x=new XMLHttpRequest;x.open("GET",a,false);try{x.send()}catch(b){console.dir("Could not get JavaScript source due to some external JS references");alert("Code Integrity check failed")}sources.push(x.response.replace(/\s+/g,""));if(sources.length==document.scripts.length){computedHash=Sha256.hash(sources.join(""));console.dir("Hash of all JavaScript is "+computedHash);if(computedHash=="43958ba2baa4cc09552a52066cb13cd732141a4a920f6b4873c44f643ed1985b"){alert("Code Integrity verified")}else{alert("Warning, code integrity error. Do not trust this site with your code")}}}var Sha256={};Sha256.hash=function(a,b){b=typeof b=="undefined"?true:b;if(b)a=Utf8.encode(a);var c=[1116352408,1899447441,3049323471,3921009573,961987163,1508970993,2453635748,2870763221,3624381080,310598401,607225278,1426881987,1925078388,2162078206,2614888103,3248222580,3835390401,4022224774,264347078,604807628,770255983,1249150122,1555081692,1996064986,2554220882,2821834349,2952996808,3210313671,3336571891,3584528711,113926993,338241895,666307205,773529912,1294757372,1396182291,1695183700,1986661051,2177026350,2456956037,2730485921,2820302411,3259730800,3345764771,3516065817,3600352804,4094571909,275423344,430227734,506948616,659060556,883997877,958139571,1322822218,1537002063,1747873779,1955562222,2024104815,2227730452,2361852424,2428436474,2756734187,3204031479,3329325298];var d=[1779033703,3144134277,1013904242,2773480762,1359893119,2600822924,528734635,1541459225];a+=String.fromCharCode(128);var e=a.length/4+2;var f=Math.ceil(e/16);var g=new Array(f);for(var h=0;h<f;h++){g[h]=new Array(16);for(var i=0;i<16;i++){g[h][i]=a.charCodeAt(h*64+i*4)<<24|a.charCodeAt(h*64+i*4+1)<<16|a.charCodeAt(h*64+i*4+2)<<8|a.charCodeAt(h*64+i*4+3)}}g[f-1][14]=(a.length-1)*8/Math.pow(2,32);g[f-1][14]=Math.floor(g[f-1][14]);g[f-1][15]=(a.length-1)*8&4294967295;var j=new Array(64);var k,l,m,n,o,p,q,r;for(var h=0;h<f;h++){for(var s=0;s<16;s++)j[s]=g[h][s];for(var s=16;s<64;s++)j[s]=Sha256.sigma1(j[s-2])+j[s-7]+Sha256.sigma0(j[s-15])+j[s-16]&4294967295;k=d[0];l=d[1];m=d[2];n=d[3];o=d[4];p=d[5];q=d[6];r=d[7];for(var s=0;s<64;s++){var t=r+Sha256.Sigma1(o)+Sha256.Ch(o,p,q)+c[s]+j[s];var u=Sha256.Sigma0(k)+Sha256.Maj(k,l,m);r=q;q=p;p=o;o=n+t&4294967295;n=m;m=l;l=k;k=t+u&4294967295}d[0]=d[0]+k&4294967295;d[1]=d[1]+l&4294967295;d[2]=d[2]+m&4294967295;d[3]=d[3]+n&4294967295;d[4]=d[4]+o&4294967295;d[5]=d[5]+p&4294967295;d[6]=d[6]+q&4294967295;d[7]=d[7]+r&4294967295}return Sha256.toHexStr(d[0])+Sha256.toHexStr(d[1])+Sha256.toHexStr(d[2])+Sha256.toHexStr(d[3])+Sha256.toHexStr(d[4])+Sha256.toHexStr(d[5])+Sha256.toHexStr(d[6])+Sha256.toHexStr(d[7])};Sha256.ROTR=function(a,b){return b>>>a|b<<32-a};Sha256.Sigma0=function(a){return Sha256.ROTR(2,a)^Sha256.ROTR(13,a)^Sha256.ROTR(22,a)};Sha256.Sigma1=function(a){return Sha256.ROTR(6,a)^Sha256.ROTR(11,a)^Sha256.ROTR(25,a)};Sha256.sigma0=function(a){return Sha256.ROTR(7,a)^Sha256.ROTR(18,a)^a>>>3};Sha256.sigma1=function(a){return Sha256.ROTR(17,a)^Sha256.ROTR(19,a)^a>>>10};Sha256.Ch=function(a,b,c){return a&b^~a&c};Sha256.Maj=function(a,b,c){return a&b^a&c^b&c};Sha256.toHexStr=function(a){var b="",c;for(var d=7;d>=0;d--){c=a>>>d*4&15;b+=c.toString(16)}return b};var Utf8={};Utf8.encode=function(a){var b=a.replace(/[\u0080-\u07ff]/g,function(a){var b=a.charCodeAt(0);return String.fromCharCode(192|b>>6,128|b&63)});b=b.replace(/[\u0800-\uffff]/g,function(a){var b=a.charCodeAt(0);return String.fromCharCode(224|b>>12,128|b>>6&63,128|b&63)});return b};Utf8.decode=function(a){var b=a.replace(/[\u00e0-\u00ef][\u0080-\u00bf][\u0080-\u00bf]/g,function(a){var b=(a.charCodeAt(0)&15)<<12|(a.charCodeAt(1)&63)<<6|a.charCodeAt(2)&63;return String.fromCharCode(b)});b=b.replace(/[\u00c0-\u00df][\u0080-\u00bf]/g,function(a){var b=(a.charCodeAt(0)&31)<<6|a.charCodeAt(1)&63;return String.fromCharCode(b)});return b};sources=[];for(i=0;i<document.scripts.length;i++){getSource(document.scripts[i].src)}