Download diep pow_worker.js here Here is the complete code if you just want to look at it:

window=self;(function(){function solve(prefix,difficulty){for(;;){var r=generateRandomString(16);var str=prefix+r+prefix;if(solvesDifficulty(sha1(str),difficulty))return r;}} function solvesDifficulty(str,difficulty){for(var i=0;i<~~(difficulty/4);++i){if(str[i]!="0")return false;} for(var i=4*~~(difficulty/4);i>2]|=t[r]<>2]|=i<>2]|=(192|i>>6)<>2]|=(128|63&i)<=57344?(a[e>>2]|=(224|i>>12)<>2]|=(128|i>>6&63)<>2]|=(128|63&i)<>2]|=(240|i>>18)<>2]|=(128|i>>12&63)<>2]|=(128|i>>6&63)<>2]|=(128|63&i)<=64?(this.block=a[16],this.start=e-64,this.hash(),this.hashed=!0):this.start=e}return this.bytes>4294967295&&(this.hBytes+=this.bytes/4294967296<<0,this.bytes=this.bytes%4294967296),this}},t.prototype.finalize=function(){if(!this.finalized){this.finalized=!0;var t=this.blocks,h=this.lastByteIndex;t[16]=this.block,t[h>>2]|=o[3&h],this.block=t[16],h>=56&&(this.hashed||this.hash(),t[0]=this.block,t[16]=t[1]=t[2]=t[3]=t[4]=t[5]=t[6]=t[7]=t[8]=t[9]=t[10]=t[11]=t[12]=t[13]=t[14]=t[15]=0),t[14]=this.hBytes<<3|this.bytes>>>29,t[15]=this.bytes<<3,this.hash()}},t.prototype.hash=function(){var t,h,s=this.h0,i=this.h1,e=this.h2,r=this.h3,o=this.h4,n=this.blocks;for(t=16;t<80;++t)h=n[t-3]^n[t-8]^n[t-14]^n[t-16],n[t]=h<<1|h>>>31;for(t=0;t<20;t+=5)s=(h=(i=(h=(e=(h=(r=(h=(o=(h=s<<5|s>>>27)+(i&e|~i&r)+o+1518500249+n[t]<<0)<<5|o>>>27)+(s&(i=i<<30|i>>>2)|~s&e)+r+1518500249+n[t+1]<<0)<<5|r>>>27)+(o&(s=s<<30|s>>>2)|~o&i)+e+1518500249+n[t+2]<<0)<<5|e>>>27)+(r&(o=o<<30|o>>>2)|~r&s)+i+1518500249+n[t+3]<<0)<<5|i>>>27)+(e&(r=r<<30|r>>>2)|~e&o)+s+1518500249+n[t+4]<<0,e=e<<30|e>>>2;for(;t<40;t+=5)s=(h=(i=(h=(e=(h=(r=(h=(o=(h=s<<5|s>>>27)+(i^e^r)+o+1859775393+n[t]<<0)<<5|o>>>27)+(s^(i=i<<30|i>>>2)^e)+r+1859775393+n[t+1]<<0)<<5|r>>>27)+(o^(s=s<<30|s>>>2)^i)+e+1859775393+n[t+2]<<0)<<5|e>>>27)+(r^(o=o<<30|o>>>2)^s)+i+1859775393+n[t+3]<<0)<<5|i>>>27)+(e^(r=r<<30|r>>>2)^o)+s+1859775393+n[t+4]<<0,e=e<<30|e>>>2;for(;t<60;t+=5)s=(h=(i=(h=(e=(h=(r=(h=(o=(h=s<<5|s>>>27)+(i&e|i&r|e&r)+o-1894007588+n[t]<<0)<<5|o>>>27)+(s&(i=i<<30|i>>>2)|s&e|i&e)+r-1894007588+n[t+1]<<0)<<5|r>>>27)+(o&(s=s<<30|s>>>2)|o&i|s&i)+e-1894007588+n[t+2]<<0)<<5|e>>>27)+(r&(o=o<<30|o>>>2)|r&s|o&s)+i-1894007588+n[t+3]<<0)<<5|i>>>27)+(e&(r=r<<30|r>>>2)|e&o|r&o)+s-1894007588+n[t+4]<<0,e=e<<30|e>>>2;for(;t<80;t+=5)s=(h=(i=(h=(e=(h=(r=(h=(o=(h=s<<5|s>>>27)+(i^e^r)+o-899497514+n[t]<<0)<<5|o>>>27)+(s^(i=i<<30|i>>>2)^e)+r-899497514+n[t+1]<<0)<<5|r>>>27)+(o^(s=s<<30|s>>>2)^i)+e-899497514+n[t+2]<<0)<<5|e>>>27)+(r^(o=o<<30|o>>>2)^s)+i-899497514+n[t+3]<<0)<<5|i>>>27)+(e^(r=r<<30|r>>>2)^o)+s-899497514+n[t+4]<<0,e=e<<30|e>>>2;this.h0=this.h0+s<<0,this.h1=this.h1+i<<0,this.h2=this.h2+e<<0,this.h3=this.h3+r<<0,this.h4=this.h4+o<<0},t.prototype.hex=function(){this.finalize();var t=this.h0,h=this.h1,s=this.h2,i=this.h3,e=this.h4;return r[t>>28&15]+r[t>>24&15]+r[t>>20&15]+r[t>>16&15]+r[t>>12&15]+r[t>>8&15]+r[t>>4&15]+r[15&t]+r[h>>28&15]+r[h>>24&15]+r[h>>20&15]+r[h>>16&15]+r[h>>12&15]+r[h>>8&15]+r[h>>4&15]+r[15&h]+r[s>>28&15]+r[s>>24&15]+r[s>>20&15]+r[s>>16&15]+r[s>>12&15]+r[s>>8&15]+r[s>>4&15]+r[15&s]+r[i>>28&15]+r[i>>24&15]+r[i>>20&15]+r[i>>16&15]+r[i>>12&15]+r[i>>8&15]+r[i>>4&15]+r[15&i]+r[e>>28&15]+r[e>>24&15]+r[e>>20&15]+r[e>>16&15]+r[e>>12&15]+r[e>>8&15]+r[e>>4&15]+r[15&e]},t.prototype.toString=t.prototype.hex,t.prototype.digest=function(){this.finalize();var t=this.h0,h=this.h1,s=this.h2,i=this.h3,e=this.h4;return[t>>24&255,t>>16&255,t>>8&255,255&t,h>>24&255,h>>16&255,h>>8&255,255&h,s>>24&255,s>>16&255,s>>8&255,255&s,i>>24&255,i>>16&255,i>>8&255,255&i,e>>24&255,e>>16&255,e>>8&255,255&e]},t.prototype.array=t.prototype.digest,t.prototype.arrayBuffer=function(){this.finalize();var t=new ArrayBuffer(20),h=new DataView(t);return h.setUint32(0,this.h0),h.setUint32(4,this.h1),h.setUint32(8,this.h2),h.setUint32(12,this.h3),h.setUint32(16,this.h4),t};var y=c();i?module.exports=y:(h.sha1=y,e&&define(function(){return y}))}();