(function(){
const IV=[0x6A09E667,0xBB67AE85,0x3C6EF372,0xA54FF53A,0x510E527F,0x9B05688C,0x1F83D9AB,0x5BE0CD19];
const PERM=[2,6,3,10,7,0,4,13,1,11,12,5,9,14,15,8];
const CS=1, CE=2, PAR=4, ROOT=8;
function rotr(x,n){return ((x>>>n)|(x<<(32-n)))>>>0;}
function G(s,a,b,c,d,mx,my){
  s[a]=(s[a]+s[b]+mx)>>>0; s[d]=rotr((s[d]^s[a])>>>0,16);
  s[c]=(s[c]+s[d])>>>0;    s[b]=rotr((s[b]^s[c])>>>0,12);
  s[a]=(s[a]+s[b]+my)>>>0; s[d]=rotr((s[d]^s[a])>>>0,8);
  s[c]=(s[c]+s[d])>>>0;    s[b]=rotr((s[b]^s[c])>>>0,7);
}
function rnd(s,m){
  G(s,0,4,8,12,m[0],m[1]);   G(s,1,5,9,13,m[2],m[3]);
  G(s,2,6,10,14,m[4],m[5]);  G(s,3,7,11,15,m[6],m[7]);
  G(s,0,5,10,15,m[8],m[9]);  G(s,1,6,11,12,m[10],m[11]);
  G(s,2,7,8,13,m[12],m[13]); G(s,3,4,9,14,m[14],m[15]);
}
function compress(cv,block,counter,blockLen,flags){
  const s=[cv[0],cv[1],cv[2],cv[3],cv[4],cv[5],cv[6],cv[7],
           IV[0],IV[1],IV[2],IV[3],
           counter>>>0, Math.floor(counter/4294967296)>>>0, blockLen, flags];
  let m=block.slice();
  for(let r=0;r<7;r++){
    rnd(s,m);
    if(r<6){ const p=new Array(16); for(let i=0;i<16;i++) p[i]=m[PERM[i]]; m=p; }
  }
  const out=new Array(16);
  for(let i=0;i<8;i++){ out[i]=(s[i]^s[i+8])>>>0; out[i+8]=(s[i+8]^cv[i])>>>0; }
  return out;
}
function readBlock(b,off,len){
  const w=new Array(16).fill(0);
  for(let i=0;i<len;i++) w[i>>2] |= b[off+i] << (8*(i&3));
  for(let i=0;i<16;i++) w[i]=w[i]>>>0;
  return w;
}
function chunkOut(b,start,end,ci){
  let cv=IV.slice();
  const len=end-start, nB=Math.max(1,Math.ceil(len/64));
  for(let i=0;i<nB-1;i++){
    cv=compress(cv, readBlock(b,start+i*64,64), ci, 64, i===0?CS:0).slice(0,8);
  }
  const bs=start+(nB-1)*64, bl=end-bs;
  return {cv:cv, block:readBlock(b,bs,bl), counter:ci, blockLen:bl,
          flags: CE | (nB===1?CS:0)};
}
function cvOf(o){ return compress(o.cv,o.block,o.counter,o.blockLen,o.flags).slice(0,8); }
function parentObj(l,r){ return {cv:IV.slice(), block:l.concat(r), counter:0, blockLen:64, flags:PAR}; }
function b3bytes(b){
  const n=b.length, tot=Math.max(1,Math.ceil(n/1024));
  let stack=[], last=null;
  for(let ci=0;ci<tot;ci++){
    const o=chunkOut(b, ci*1024, Math.min(ci*1024+1024,n), ci);
    if(ci===tot-1){ last=o; break; }
    let cv=cvOf(o), total=ci+1;
    while((total&1)===0){ cv=cvOf(parentObj(stack.pop(),cv)); total>>=1; }
    stack.push(cv);
  }
  let out=last;
  for(let i=stack.length-1;i>=0;i--) out=parentObj(stack[i], cvOf(out));
  const w=compress(out.cv,out.block,out.counter,out.blockLen,out.flags|ROOT);
  let hex='';
  for(let i=0;i<8;i++){
    const v=w[i];
    for(let j=0;j<4;j++) hex += (((v>>>(8*j))&255)+256).toString(16).slice(1);
  }
  return hex;
}
function utf8(s){ return new TextEncoder().encode(s); }
window.__b3   = b3bytes;
window.__b3s  = function(s){ return b3bytes(utf8(s)); };
window.__b64enc = function(s){
  const u=utf8(s); let bin='';
  for(let i=0;i<u.length;i+=0x8000) bin += String.fromCharCode.apply(null, u.subarray(i,i+0x8000));
  return btoa(bin);
};
window.__chave = function(b64, ext){ return b3bytes(utf8(b64+ext)).slice(0,32); };

})();