twitst4tz

index.js (41819B)

---

 (function(){
 
     // Copyright (c) 2005  Tom Wu
     // All Rights Reserved.
     // See "LICENSE" for details.
 
     // Basic JavaScript BN library - subset useful for RSA encryption.
 
     // Bits per digit
     var dbits;
 
     // JavaScript engine analysis
     var canary = 0xdeadbeefcafe;
     var j_lm = ((canary&0xffffff)==0xefcafe);
 
     // (public) Constructor
     function BigInteger(a,b,c) {
       if(a != null)
         if("number" == typeof a) this.fromNumber(a,b,c);
         else if(b == null && "string" != typeof a) this.fromString(a,256);
         else this.fromString(a,b);
     }
 
     // return new, unset BigInteger
     function nbi() { return new BigInteger(null); }
 
     // am: Compute w_j += (x*this_i), propagate carries,
     // c is initial carry, returns final carry.
     // c < 3*dvalue, x < 2*dvalue, this_i < dvalue
     // We need to select the fastest one that works in this environment.
 
     // am1: use a single mult and divide to get the high bits,
     // max digit bits should be 26 because
     // max internal value = 2*dvalue^2-2*dvalue (< 2^53)
     function am1(i,x,w,j,c,n) {
       while(--n >= 0) {
         var v = x*this[i++]+w[j]+c;
         c = Math.floor(v/0x4000000);
         w[j++] = v&0x3ffffff;
       }
       return c;
     }
     // am2 avoids a big mult-and-extract completely.
     // Max digit bits should be <= 30 because we do bitwise ops
     // on values up to 2*hdvalue^2-hdvalue-1 (< 2^31)
     function am2(i,x,w,j,c,n) {
       var xl = x&0x7fff, xh = x>>15;
       while(--n >= 0) {
         var l = this[i]&0x7fff;
         var h = this[i++]>>15;
         var m = xh*l+h*xl;
         l = xl*l+((m&0x7fff)<<15)+w[j]+(c&0x3fffffff);
         c = (l>>>30)+(m>>>15)+xh*h+(c>>>30);
         w[j++] = l&0x3fffffff;
       }
       return c;
     }
     // Alternately, set max digit bits to 28 since some
     // browsers slow down when dealing with 32-bit numbers.
     function am3(i,x,w,j,c,n) {
       var xl = x&0x3fff, xh = x>>14;
       while(--n >= 0) {
         var l = this[i]&0x3fff;
         var h = this[i++]>>14;
         var m = xh*l+h*xl;
         l = xl*l+((m&0x3fff)<<14)+w[j]+c;
         c = (l>>28)+(m>>14)+xh*h;
         w[j++] = l&0xfffffff;
       }
       return c;
     }
     var inBrowser = typeof navigator !== "undefined";
     if(inBrowser && j_lm && (navigator.appName == "Microsoft Internet Explorer")) {
       BigInteger.prototype.am = am2;
       dbits = 30;
     }
     else if(inBrowser && j_lm && (navigator.appName != "Netscape")) {
       BigInteger.prototype.am = am1;
       dbits = 26;
     }
     else { // Mozilla/Netscape seems to prefer am3
       BigInteger.prototype.am = am3;
       dbits = 28;
     }
 
     BigInteger.prototype.DB = dbits;
     BigInteger.prototype.DM = ((1<<dbits)-1);
     BigInteger.prototype.DV = (1<<dbits);
 
     var BI_FP = 52;
     BigInteger.prototype.FV = Math.pow(2,BI_FP);
     BigInteger.prototype.F1 = BI_FP-dbits;
     BigInteger.prototype.F2 = 2*dbits-BI_FP;
 
     // Digit conversions
     var BI_RM = "0123456789abcdefghijklmnopqrstuvwxyz";
     var BI_RC = new Array();
     var rr,vv;
     rr = "0".charCodeAt(0);
     for(vv = 0; vv <= 9; ++vv) BI_RC[rr++] = vv;
     rr = "a".charCodeAt(0);
     for(vv = 10; vv < 36; ++vv) BI_RC[rr++] = vv;
     rr = "A".charCodeAt(0);
     for(vv = 10; vv < 36; ++vv) BI_RC[rr++] = vv;
 
     function int2char(n) { return BI_RM.charAt(n); }
     function intAt(s,i) {
       var c = BI_RC[s.charCodeAt(i)];
       return (c==null)?-1:c;
     }
 
     // (protected) copy this to r
     function bnpCopyTo(r) {
       for(var i = this.t-1; i >= 0; --i) r[i] = this[i];
       r.t = this.t;
       r.s = this.s;
     }
 
     // (protected) set from integer value x, -DV <= x < DV
     function bnpFromInt(x) {
       this.t = 1;
       this.s = (x<0)?-1:0;
       if(x > 0) this[0] = x;
       else if(x < -1) this[0] = x+this.DV;
       else this.t = 0;
     }
 
     // return bigint initialized to value
     function nbv(i) { var r = nbi(); r.fromInt(i); return r; }
 
     // (protected) set from string and radix
     function bnpFromString(s,b) {
       var k;
       if(b == 16) k = 4;
       else if(b == 8) k = 3;
       else if(b == 256) k = 8; // byte array
       else if(b == 2) k = 1;
       else if(b == 32) k = 5;
       else if(b == 4) k = 2;
       else { this.fromRadix(s,b); return; }
       this.t = 0;
       this.s = 0;
       var i = s.length, mi = false, sh = 0;
       while(--i >= 0) {
         var x = (k==8)?s[i]&0xff:intAt(s,i);
         if(x < 0) {
           if(s.charAt(i) == "-") mi = true;
           continue;
         }
         mi = false;
         if(sh == 0)
           this[this.t++] = x;
         else if(sh+k > this.DB) {
           this[this.t-1] |= (x&((1<<(this.DB-sh))-1))<<sh;
           this[this.t++] = (x>>(this.DB-sh));
         }
         else
           this[this.t-1] |= x<<sh;
         sh += k;
         if(sh >= this.DB) sh -= this.DB;
       }
       if(k == 8 && (s[0]&0x80) != 0) {
         this.s = -1;
         if(sh > 0) this[this.t-1] |= ((1<<(this.DB-sh))-1)<<sh;
       }
       this.clamp();
       if(mi) BigInteger.ZERO.subTo(this,this);
     }
 
     // (protected) clamp off excess high words
     function bnpClamp() {
       var c = this.s&this.DM;
       while(this.t > 0 && this[this.t-1] == c) --this.t;
     }
 
     // (public) return string representation in given radix
     function bnToString(b) {
       if(this.s < 0) return "-"+this.negate().toString(b);
       var k;
       if(b == 16) k = 4;
       else if(b == 8) k = 3;
       else if(b == 2) k = 1;
       else if(b == 32) k = 5;
       else if(b == 4) k = 2;
       else return this.toRadix(b);
       var km = (1<<k)-1, d, m = false, r = "", i = this.t;
       var p = this.DB-(i*this.DB)%k;
       if(i-- > 0) {
         if(p < this.DB && (d = this[i]>>p) > 0) { m = true; r = int2char(d); }
         while(i >= 0) {
           if(p < k) {
             d = (this[i]&((1<<p)-1))<<(k-p);
             d |= this[--i]>>(p+=this.DB-k);
           }
           else {
             d = (this[i]>>(p-=k))&km;
             if(p <= 0) { p += this.DB; --i; }
           }
           if(d > 0) m = true;
           if(m) r += int2char(d);
         }
       }
       return m?r:"0";
     }
 
     // (public) -this
     function bnNegate() { var r = nbi(); BigInteger.ZERO.subTo(this,r); return r; }
 
     // (public) |this|
     function bnAbs() { return (this.s<0)?this.negate():this; }
 
     // (public) return + if this > a, - if this < a, 0 if equal
     function bnCompareTo(a) {
       var r = this.s-a.s;
       if(r != 0) return r;
       var i = this.t;
       r = i-a.t;
       if(r != 0) return (this.s<0)?-r:r;
       while(--i >= 0) if((r=this[i]-a[i]) != 0) return r;
       return 0;
     }
 
     // returns bit length of the integer x
     function nbits(x) {
       var r = 1, t;
       if((t=x>>>16) != 0) { x = t; r += 16; }
       if((t=x>>8) != 0) { x = t; r += 8; }
       if((t=x>>4) != 0) { x = t; r += 4; }
       if((t=x>>2) != 0) { x = t; r += 2; }
       if((t=x>>1) != 0) { x = t; r += 1; }
       return r;
     }
 
     // (public) return the number of bits in "this"
     function bnBitLength() {
       if(this.t <= 0) return 0;
       return this.DB*(this.t-1)+nbits(this[this.t-1]^(this.s&this.DM));
     }
 
     // (protected) r = this << n*DB
     function bnpDLShiftTo(n,r) {
       var i;
       for(i = this.t-1; i >= 0; --i) r[i+n] = this[i];
       for(i = n-1; i >= 0; --i) r[i] = 0;
       r.t = this.t+n;
       r.s = this.s;
     }
 
     // (protected) r = this >> n*DB
     function bnpDRShiftTo(n,r) {
       for(var i = n; i < this.t; ++i) r[i-n] = this[i];
       r.t = Math.max(this.t-n,0);
       r.s = this.s;
     }
 
     // (protected) r = this << n
     function bnpLShiftTo(n,r) {
       var bs = n%this.DB;
       var cbs = this.DB-bs;
       var bm = (1<<cbs)-1;
       var ds = Math.floor(n/this.DB), c = (this.s<<bs)&this.DM, i;
       for(i = this.t-1; i >= 0; --i) {
         r[i+ds+1] = (this[i]>>cbs)|c;
         c = (this[i]&bm)<<bs;
       }
       for(i = ds-1; i >= 0; --i) r[i] = 0;
       r[ds] = c;
       r.t = this.t+ds+1;
       r.s = this.s;
       r.clamp();
     }
 
     // (protected) r = this >> n
     function bnpRShiftTo(n,r) {
       r.s = this.s;
       var ds = Math.floor(n/this.DB);
       if(ds >= this.t) { r.t = 0; return; }
       var bs = n%this.DB;
       var cbs = this.DB-bs;
       var bm = (1<<bs)-1;
       r[0] = this[ds]>>bs;
       for(var i = ds+1; i < this.t; ++i) {
         r[i-ds-1] |= (this[i]&bm)<<cbs;
         r[i-ds] = this[i]>>bs;
       }
       if(bs > 0) r[this.t-ds-1] |= (this.s&bm)<<cbs;
       r.t = this.t-ds;
       r.clamp();
     }
 
     // (protected) r = this - a
     function bnpSubTo(a,r) {
       var i = 0, c = 0, m = Math.min(a.t,this.t);
       while(i < m) {
         c += this[i]-a[i];
         r[i++] = c&this.DM;
         c >>= this.DB;
       }
       if(a.t < this.t) {
         c -= a.s;
         while(i < this.t) {
           c += this[i];
           r[i++] = c&this.DM;
           c >>= this.DB;
         }
         c += this.s;
       }
       else {
         c += this.s;
         while(i < a.t) {
           c -= a[i];
           r[i++] = c&this.DM;
           c >>= this.DB;
         }
         c -= a.s;
       }
       r.s = (c<0)?-1:0;
       if(c < -1) r[i++] = this.DV+c;
       else if(c > 0) r[i++] = c;
       r.t = i;
       r.clamp();
     }
 
     // (protected) r = this * a, r != this,a (HAC 14.12)
     // "this" should be the larger one if appropriate.
     function bnpMultiplyTo(a,r) {
       var x = this.abs(), y = a.abs();
       var i = x.t;
       r.t = i+y.t;
       while(--i >= 0) r[i] = 0;
       for(i = 0; i < y.t; ++i) r[i+x.t] = x.am(0,y[i],r,i,0,x.t);
       r.s = 0;
       r.clamp();
       if(this.s != a.s) BigInteger.ZERO.subTo(r,r);
     }
 
     // (protected) r = this^2, r != this (HAC 14.16)
     function bnpSquareTo(r) {
       var x = this.abs();
       var i = r.t = 2*x.t;
       while(--i >= 0) r[i] = 0;
       for(i = 0; i < x.t-1; ++i) {
         var c = x.am(i,x[i],r,2*i,0,1);
         if((r[i+x.t]+=x.am(i+1,2*x[i],r,2*i+1,c,x.t-i-1)) >= x.DV) {
           r[i+x.t] -= x.DV;
           r[i+x.t+1] = 1;
         }
       }
       if(r.t > 0) r[r.t-1] += x.am(i,x[i],r,2*i,0,1);
       r.s = 0;
       r.clamp();
     }
 
     // (protected) divide this by m, quotient and remainder to q, r (HAC 14.20)
     // r != q, this != m.  q or r may be null.
     function bnpDivRemTo(m,q,r) {
       var pm = m.abs();
       if(pm.t <= 0) return;
       var pt = this.abs();
       if(pt.t < pm.t) {
         if(q != null) q.fromInt(0);
         if(r != null) this.copyTo(r);
         return;
       }
       if(r == null) r = nbi();
       var y = nbi(), ts = this.s, ms = m.s;
       var nsh = this.DB-nbits(pm[pm.t-1]);   // normalize modulus
       if(nsh > 0) { pm.lShiftTo(nsh,y); pt.lShiftTo(nsh,r); }
       else { pm.copyTo(y); pt.copyTo(r); }
       var ys = y.t;
       var y0 = y[ys-1];
       if(y0 == 0) return;
       var yt = y0*(1<<this.F1)+((ys>1)?y[ys-2]>>this.F2:0);
       var d1 = this.FV/yt, d2 = (1<<this.F1)/yt, e = 1<<this.F2;
       var i = r.t, j = i-ys, t = (q==null)?nbi():q;
       y.dlShiftTo(j,t);
       if(r.compareTo(t) >= 0) {
         r[r.t++] = 1;
         r.subTo(t,r);
       }
       BigInteger.ONE.dlShiftTo(ys,t);
       t.subTo(y,y);  // "negative" y so we can replace sub with am later
       while(y.t < ys) y[y.t++] = 0;
       while(--j >= 0) {
         // Estimate quotient digit
         var qd = (r[--i]==y0)?this.DM:Math.floor(r[i]*d1+(r[i-1]+e)*d2);
         if((r[i]+=y.am(0,qd,r,j,0,ys)) < qd) {   // Try it out
           y.dlShiftTo(j,t);
           r.subTo(t,r);
           while(r[i] < --qd) r.subTo(t,r);
         }
       }
       if(q != null) {
         r.drShiftTo(ys,q);
         if(ts != ms) BigInteger.ZERO.subTo(q,q);
       }
       r.t = ys;
       r.clamp();
       if(nsh > 0) r.rShiftTo(nsh,r); // Denormalize remainder
       if(ts < 0) BigInteger.ZERO.subTo(r,r);
     }
 
     // (public) this mod a
     function bnMod(a) {
       var r = nbi();
       this.abs().divRemTo(a,null,r);
       if(this.s < 0 && r.compareTo(BigInteger.ZERO) > 0) a.subTo(r,r);
       return r;
     }
 
     // Modular reduction using "classic" algorithm
     function Classic(m) { this.m = m; }
     function cConvert(x) {
       if(x.s < 0 || x.compareTo(this.m) >= 0) return x.mod(this.m);
       else return x;
     }
     function cRevert(x) { return x; }
     function cReduce(x) { x.divRemTo(this.m,null,x); }
     function cMulTo(x,y,r) { x.multiplyTo(y,r); this.reduce(r); }
     function cSqrTo(x,r) { x.squareTo(r); this.reduce(r); }
 
     Classic.prototype.convert = cConvert;
     Classic.prototype.revert = cRevert;
     Classic.prototype.reduce = cReduce;
     Classic.prototype.mulTo = cMulTo;
     Classic.prototype.sqrTo = cSqrTo;
 
     // (protected) return "-1/this % 2^DB"; useful for Mont. reduction
     // justification:
     //         xy == 1 (mod m)
     //         xy =  1+km
     //   xy(2-xy) = (1+km)(1-km)
     // x[y(2-xy)] = 1-k^2m^2
     // x[y(2-xy)] == 1 (mod m^2)
     // if y is 1/x mod m, then y(2-xy) is 1/x mod m^2
     // should reduce x and y(2-xy) by m^2 at each step to keep size bounded.
     // JS multiply "overflows" differently from C/C++, so care is needed here.
     function bnpInvDigit() {
       if(this.t < 1) return 0;
       var x = this[0];
       if((x&1) == 0) return 0;
       var y = x&3;       // y == 1/x mod 2^2
       y = (y*(2-(x&0xf)*y))&0xf; // y == 1/x mod 2^4
       y = (y*(2-(x&0xff)*y))&0xff;   // y == 1/x mod 2^8
       y = (y*(2-(((x&0xffff)*y)&0xffff)))&0xffff;    // y == 1/x mod 2^16
       // last step - calculate inverse mod DV directly;
       // assumes 16 < DB <= 32 and assumes ability to handle 48-bit ints
       y = (y*(2-x*y%this.DV))%this.DV;       // y == 1/x mod 2^dbits
       // we really want the negative inverse, and -DV < y < DV
       return (y>0)?this.DV-y:-y;
     }
 
     // Montgomery reduction
     function Montgomery(m) {
       this.m = m;
       this.mp = m.invDigit();
       this.mpl = this.mp&0x7fff;
       this.mph = this.mp>>15;
       this.um = (1<<(m.DB-15))-1;
       this.mt2 = 2*m.t;
     }
 
     // xR mod m
     function montConvert(x) {
       var r = nbi();
       x.abs().dlShiftTo(this.m.t,r);
       r.divRemTo(this.m,null,r);
       if(x.s < 0 && r.compareTo(BigInteger.ZERO) > 0) this.m.subTo(r,r);
       return r;
     }
 
     // x/R mod m
     function montRevert(x) {
       var r = nbi();
       x.copyTo(r);
       this.reduce(r);
       return r;
     }
 
     // x = x/R mod m (HAC 14.32)
     function montReduce(x) {
       while(x.t <= this.mt2) // pad x so am has enough room later
         x[x.t++] = 0;
       for(var i = 0; i < this.m.t; ++i) {
         // faster way of calculating u0 = x[i]*mp mod DV
         var j = x[i]&0x7fff;
         var u0 = (j*this.mpl+(((j*this.mph+(x[i]>>15)*this.mpl)&this.um)<<15))&x.DM;
         // use am to combine the multiply-shift-add into one call
         j = i+this.m.t;
         x[j] += this.m.am(0,u0,x,i,0,this.m.t);
         // propagate carry
         while(x[j] >= x.DV) { x[j] -= x.DV; x[++j]++; }
       }
       x.clamp();
       x.drShiftTo(this.m.t,x);
       if(x.compareTo(this.m) >= 0) x.subTo(this.m,x);
     }
 
     // r = "x^2/R mod m"; x != r
     function montSqrTo(x,r) { x.squareTo(r); this.reduce(r); }
 
     // r = "xy/R mod m"; x,y != r
     function montMulTo(x,y,r) { x.multiplyTo(y,r); this.reduce(r); }
 
     Montgomery.prototype.convert = montConvert;
     Montgomery.prototype.revert = montRevert;
     Montgomery.prototype.reduce = montReduce;
     Montgomery.prototype.mulTo = montMulTo;
     Montgomery.prototype.sqrTo = montSqrTo;
 
     // (protected) true iff this is even
     function bnpIsEven() { return ((this.t>0)?(this[0]&1):this.s) == 0; }
 
     // (protected) this^e, e < 2^32, doing sqr and mul with "r" (HAC 14.79)
     function bnpExp(e,z) {
       if(e > 0xffffffff || e < 1) return BigInteger.ONE;
       var r = nbi(), r2 = nbi(), g = z.convert(this), i = nbits(e)-1;
       g.copyTo(r);
       while(--i >= 0) {
         z.sqrTo(r,r2);
         if((e&(1<<i)) > 0) z.mulTo(r2,g,r);
         else { var t = r; r = r2; r2 = t; }
       }
       return z.revert(r);
     }
 
     // (public) this^e % m, 0 <= e < 2^32
     function bnModPowInt(e,m) {
       var z;
       if(e < 256 || m.isEven()) z = new Classic(m); else z = new Montgomery(m);
       return this.exp(e,z);
     }
 
     // protected
     BigInteger.prototype.copyTo = bnpCopyTo;
     BigInteger.prototype.fromInt = bnpFromInt;
     BigInteger.prototype.fromString = bnpFromString;
     BigInteger.prototype.clamp = bnpClamp;
     BigInteger.prototype.dlShiftTo = bnpDLShiftTo;
     BigInteger.prototype.drShiftTo = bnpDRShiftTo;
     BigInteger.prototype.lShiftTo = bnpLShiftTo;
     BigInteger.prototype.rShiftTo = bnpRShiftTo;
     BigInteger.prototype.subTo = bnpSubTo;
     BigInteger.prototype.multiplyTo = bnpMultiplyTo;
     BigInteger.prototype.squareTo = bnpSquareTo;
     BigInteger.prototype.divRemTo = bnpDivRemTo;
     BigInteger.prototype.invDigit = bnpInvDigit;
     BigInteger.prototype.isEven = bnpIsEven;
     BigInteger.prototype.exp = bnpExp;
 
     // public
     BigInteger.prototype.toString = bnToString;
     BigInteger.prototype.negate = bnNegate;
     BigInteger.prototype.abs = bnAbs;
     BigInteger.prototype.compareTo = bnCompareTo;
     BigInteger.prototype.bitLength = bnBitLength;
     BigInteger.prototype.mod = bnMod;
     BigInteger.prototype.modPowInt = bnModPowInt;
 
     // "constants"
     BigInteger.ZERO = nbv(0);
     BigInteger.ONE = nbv(1);
 
     // Copyright (c) 2005-2009  Tom Wu
     // All Rights Reserved.
     // See "LICENSE" for details.
 
     // Extended JavaScript BN functions, required for RSA private ops.
 
     // Version 1.1: new BigInteger("0", 10) returns "proper" zero
     // Version 1.2: square() API, isProbablePrime fix
 
     // (public)
     function bnClone() { var r = nbi(); this.copyTo(r); return r; }
 
     // (public) return value as integer
     function bnIntValue() {
       if(this.s < 0) {
         if(this.t == 1) return this[0]-this.DV;
         else if(this.t == 0) return -1;
       }
       else if(this.t == 1) return this[0];
       else if(this.t == 0) return 0;
       // assumes 16 < DB < 32
       return ((this[1]&((1<<(32-this.DB))-1))<<this.DB)|this[0];
     }
 
     // (public) return value as byte
     function bnByteValue() { return (this.t==0)?this.s:(this[0]<<24)>>24; }
 
     // (public) return value as short (assumes DB>=16)
     function bnShortValue() { return (this.t==0)?this.s:(this[0]<<16)>>16; }
 
     // (protected) return x s.t. r^x < DV
     function bnpChunkSize(r) { return Math.floor(Math.LN2*this.DB/Math.log(r)); }
 
     // (public) 0 if this == 0, 1 if this > 0
     function bnSigNum() {
       if(this.s < 0) return -1;
       else if(this.t <= 0 || (this.t == 1 && this[0] <= 0)) return 0;
       else return 1;
     }
 
     // (protected) convert to radix string
     function bnpToRadix(b) {
       if(b == null) b = 10;
       if(this.signum() == 0 || b < 2 || b > 36) return "0";
       var cs = this.chunkSize(b);
       var a = Math.pow(b,cs);
       var d = nbv(a), y = nbi(), z = nbi(), r = "";
       this.divRemTo(d,y,z);
       while(y.signum() > 0) {
         r = (a+z.intValue()).toString(b).substr(1) + r;
         y.divRemTo(d,y,z);
       }
       return z.intValue().toString(b) + r;
     }
 
     // (protected) convert from radix string
     function bnpFromRadix(s,b) {
       this.fromInt(0);
       if(b == null) b = 10;
       var cs = this.chunkSize(b);
       var d = Math.pow(b,cs), mi = false, j = 0, w = 0;
       for(var i = 0; i < s.length; ++i) {
         var x = intAt(s,i);
         if(x < 0) {
           if(s.charAt(i) == "-" && this.signum() == 0) mi = true;
           continue;
         }
         w = b*w+x;
         if(++j >= cs) {
           this.dMultiply(d);
           this.dAddOffset(w,0);
           j = 0;
           w = 0;
         }
       }
       if(j > 0) {
         this.dMultiply(Math.pow(b,j));
         this.dAddOffset(w,0);
       }
       if(mi) BigInteger.ZERO.subTo(this,this);
     }
 
     // (protected) alternate constructor
     function bnpFromNumber(a,b,c) {
       if("number" == typeof b) {
         // new BigInteger(int,int,RNG)
         if(a < 2) this.fromInt(1);
         else {
           this.fromNumber(a,c);
           if(!this.testBit(a-1))	// force MSB set
             this.bitwiseTo(BigInteger.ONE.shiftLeft(a-1),op_or,this);
           if(this.isEven()) this.dAddOffset(1,0); // force odd
           while(!this.isProbablePrime(b)) {
             this.dAddOffset(2,0);
             if(this.bitLength() > a) this.subTo(BigInteger.ONE.shiftLeft(a-1),this);
           }
         }
       }
       else {
         // new BigInteger(int,RNG)
         var x = new Array(), t = a&7;
         x.length = (a>>3)+1;
         b.nextBytes(x);
         if(t > 0) x[0] &= ((1<<t)-1); else x[0] = 0;
         this.fromString(x,256);
       }
     }
 
     // (public) convert to bigendian byte array
     function bnToByteArray() {
       var i = this.t, r = new Array();
       r[0] = this.s;
       var p = this.DB-(i*this.DB)%8, d, k = 0;
       if(i-- > 0) {
         if(p < this.DB && (d = this[i]>>p) != (this.s&this.DM)>>p)
           r[k++] = d|(this.s<<(this.DB-p));
         while(i >= 0) {
           if(p < 8) {
             d = (this[i]&((1<<p)-1))<<(8-p);
             d |= this[--i]>>(p+=this.DB-8);
           }
           else {
             d = (this[i]>>(p-=8))&0xff;
             if(p <= 0) { p += this.DB; --i; }
           }
           if((d&0x80) != 0) d |= -256;
           if(k == 0 && (this.s&0x80) != (d&0x80)) ++k;
           if(k > 0 || d != this.s) r[k++] = d;
         }
       }
       return r;
     }
 
     function bnEquals(a) { return(this.compareTo(a)==0); }
     function bnMin(a) { return(this.compareTo(a)<0)?this:a; }
     function bnMax(a) { return(this.compareTo(a)>0)?this:a; }
 
     // (protected) r = this op a (bitwise)
     function bnpBitwiseTo(a,op,r) {
       var i, f, m = Math.min(a.t,this.t);
       for(i = 0; i < m; ++i) r[i] = op(this[i],a[i]);
       if(a.t < this.t) {
         f = a.s&this.DM;
         for(i = m; i < this.t; ++i) r[i] = op(this[i],f);
         r.t = this.t;
       }
       else {
         f = this.s&this.DM;
         for(i = m; i < a.t; ++i) r[i] = op(f,a[i]);
         r.t = a.t;
       }
       r.s = op(this.s,a.s);
       r.clamp();
     }
 
     // (public) this & a
     function op_and(x,y) { return x&y; }
     function bnAnd(a) { var r = nbi(); this.bitwiseTo(a,op_and,r); return r; }
 
     // (public) this | a
     function op_or(x,y) { return x|y; }
     function bnOr(a) { var r = nbi(); this.bitwiseTo(a,op_or,r); return r; }
 
     // (public) this ^ a
     function op_xor(x,y) { return x^y; }
     function bnXor(a) { var r = nbi(); this.bitwiseTo(a,op_xor,r); return r; }
 
     // (public) this & ~a
     function op_andnot(x,y) { return x&~y; }
     function bnAndNot(a) { var r = nbi(); this.bitwiseTo(a,op_andnot,r); return r; }
 
     // (public) ~this
     function bnNot() {
       var r = nbi();
       for(var i = 0; i < this.t; ++i) r[i] = this.DM&~this[i];
       r.t = this.t;
       r.s = ~this.s;
       return r;
     }
 
     // (public) this << n
     function bnShiftLeft(n) {
       var r = nbi();
       if(n < 0) this.rShiftTo(-n,r); else this.lShiftTo(n,r);
       return r;
     }
 
     // (public) this >> n
     function bnShiftRight(n) {
       var r = nbi();
       if(n < 0) this.lShiftTo(-n,r); else this.rShiftTo(n,r);
       return r;
     }
 
     // return index of lowest 1-bit in x, x < 2^31
     function lbit(x) {
       if(x == 0) return -1;
       var r = 0;
       if((x&0xffff) == 0) { x >>= 16; r += 16; }
       if((x&0xff) == 0) { x >>= 8; r += 8; }
       if((x&0xf) == 0) { x >>= 4; r += 4; }
       if((x&3) == 0) { x >>= 2; r += 2; }
       if((x&1) == 0) ++r;
       return r;
     }
 
     // (public) returns index of lowest 1-bit (or -1 if none)
     function bnGetLowestSetBit() {
       for(var i = 0; i < this.t; ++i)
         if(this[i] != 0) return i*this.DB+lbit(this[i]);
       if(this.s < 0) return this.t*this.DB;
       return -1;
     }
 
     // return number of 1 bits in x
     function cbit(x) {
       var r = 0;
       while(x != 0) { x &= x-1; ++r; }
       return r;
     }
 
     // (public) return number of set bits
     function bnBitCount() {
       var r = 0, x = this.s&this.DM;
       for(var i = 0; i < this.t; ++i) r += cbit(this[i]^x);
       return r;
     }
 
     // (public) true iff nth bit is set
     function bnTestBit(n) {
       var j = Math.floor(n/this.DB);
       if(j >= this.t) return(this.s!=0);
       return((this[j]&(1<<(n%this.DB)))!=0);
     }
 
     // (protected) this op (1<<n)
     function bnpChangeBit(n,op) {
       var r = BigInteger.ONE.shiftLeft(n);
       this.bitwiseTo(r,op,r);
       return r;
     }
 
     // (public) this | (1<<n)
     function bnSetBit(n) { return this.changeBit(n,op_or); }
 
     // (public) this & ~(1<<n)
     function bnClearBit(n) { return this.changeBit(n,op_andnot); }
 
     // (public) this ^ (1<<n)
     function bnFlipBit(n) { return this.changeBit(n,op_xor); }
 
     // (protected) r = this + a
     function bnpAddTo(a,r) {
       var i = 0, c = 0, m = Math.min(a.t,this.t);
       while(i < m) {
         c += this[i]+a[i];
         r[i++] = c&this.DM;
         c >>= this.DB;
       }
       if(a.t < this.t) {
         c += a.s;
         while(i < this.t) {
           c += this[i];
           r[i++] = c&this.DM;
           c >>= this.DB;
         }
         c += this.s;
       }
       else {
         c += this.s;
         while(i < a.t) {
           c += a[i];
           r[i++] = c&this.DM;
           c >>= this.DB;
         }
         c += a.s;
       }
       r.s = (c<0)?-1:0;
       if(c > 0) r[i++] = c;
       else if(c < -1) r[i++] = this.DV+c;
       r.t = i;
       r.clamp();
     }
 
     // (public) this + a
     function bnAdd(a) { var r = nbi(); this.addTo(a,r); return r; }
 
     // (public) this - a
     function bnSubtract(a) { var r = nbi(); this.subTo(a,r); return r; }
 
     // (public) this * a
     function bnMultiply(a) { var r = nbi(); this.multiplyTo(a,r); return r; }
 
     // (public) this^2
     function bnSquare() { var r = nbi(); this.squareTo(r); return r; }
 
     // (public) this / a
     function bnDivide(a) { var r = nbi(); this.divRemTo(a,r,null); return r; }
 
     // (public) this % a
     function bnRemainder(a) { var r = nbi(); this.divRemTo(a,null,r); return r; }
 
     // (public) [this/a,this%a]
     function bnDivideAndRemainder(a) {
       var q = nbi(), r = nbi();
       this.divRemTo(a,q,r);
       return new Array(q,r);
     }
 
     // (protected) this *= n, this >= 0, 1 < n < DV
     function bnpDMultiply(n) {
       this[this.t] = this.am(0,n-1,this,0,0,this.t);
       ++this.t;
       this.clamp();
     }
 
     // (protected) this += n << w words, this >= 0
     function bnpDAddOffset(n,w) {
       if(n == 0) return;
       while(this.t <= w) this[this.t++] = 0;
       this[w] += n;
       while(this[w] >= this.DV) {
         this[w] -= this.DV;
         if(++w >= this.t) this[this.t++] = 0;
         ++this[w];
       }
     }
 
     // A "null" reducer
     function NullExp() {}
     function nNop(x) { return x; }
     function nMulTo(x,y,r) { x.multiplyTo(y,r); }
     function nSqrTo(x,r) { x.squareTo(r); }
 
     NullExp.prototype.convert = nNop;
     NullExp.prototype.revert = nNop;
     NullExp.prototype.mulTo = nMulTo;
     NullExp.prototype.sqrTo = nSqrTo;
 
     // (public) this^e
     function bnPow(e) { return this.exp(e,new NullExp()); }
 
     // (protected) r = lower n words of "this * a", a.t <= n
     // "this" should be the larger one if appropriate.
     function bnpMultiplyLowerTo(a,n,r) {
       var i = Math.min(this.t+a.t,n);
       r.s = 0; // assumes a,this >= 0
       r.t = i;
       while(i > 0) r[--i] = 0;
       var j;
       for(j = r.t-this.t; i < j; ++i) r[i+this.t] = this.am(0,a[i],r,i,0,this.t);
       for(j = Math.min(a.t,n); i < j; ++i) this.am(0,a[i],r,i,0,n-i);
       r.clamp();
     }
 
     // (protected) r = "this * a" without lower n words, n > 0
     // "this" should be the larger one if appropriate.
     function bnpMultiplyUpperTo(a,n,r) {
       --n;
       var i = r.t = this.t+a.t-n;
       r.s = 0; // assumes a,this >= 0
       while(--i >= 0) r[i] = 0;
       for(i = Math.max(n-this.t,0); i < a.t; ++i)
         r[this.t+i-n] = this.am(n-i,a[i],r,0,0,this.t+i-n);
       r.clamp();
       r.drShiftTo(1,r);
     }
 
     // Barrett modular reduction
     function Barrett(m) {
       // setup Barrett
       this.r2 = nbi();
       this.q3 = nbi();
       BigInteger.ONE.dlShiftTo(2*m.t,this.r2);
       this.mu = this.r2.divide(m);
       this.m = m;
     }
 
     function barrettConvert(x) {
       if(x.s < 0 || x.t > 2*this.m.t) return x.mod(this.m);
       else if(x.compareTo(this.m) < 0) return x;
       else { var r = nbi(); x.copyTo(r); this.reduce(r); return r; }
     }
 
     function barrettRevert(x) { return x; }
 
     // x = x mod m (HAC 14.42)
     function barrettReduce(x) {
       x.drShiftTo(this.m.t-1,this.r2);
       if(x.t > this.m.t+1) { x.t = this.m.t+1; x.clamp(); }
       this.mu.multiplyUpperTo(this.r2,this.m.t+1,this.q3);
       this.m.multiplyLowerTo(this.q3,this.m.t+1,this.r2);
       while(x.compareTo(this.r2) < 0) x.dAddOffset(1,this.m.t+1);
       x.subTo(this.r2,x);
       while(x.compareTo(this.m) >= 0) x.subTo(this.m,x);
     }
 
     // r = x^2 mod m; x != r
     function barrettSqrTo(x,r) { x.squareTo(r); this.reduce(r); }
 
     // r = x*y mod m; x,y != r
     function barrettMulTo(x,y,r) { x.multiplyTo(y,r); this.reduce(r); }
 
     Barrett.prototype.convert = barrettConvert;
     Barrett.prototype.revert = barrettRevert;
     Barrett.prototype.reduce = barrettReduce;
     Barrett.prototype.mulTo = barrettMulTo;
     Barrett.prototype.sqrTo = barrettSqrTo;
 
     // (public) this^e % m (HAC 14.85)
     function bnModPow(e,m) {
       var i = e.bitLength(), k, r = nbv(1), z;
       if(i <= 0) return r;
       else if(i < 18) k = 1;
       else if(i < 48) k = 3;
       else if(i < 144) k = 4;
       else if(i < 768) k = 5;
       else k = 6;
       if(i < 8)
         z = new Classic(m);
       else if(m.isEven())
         z = new Barrett(m);
       else
         z = new Montgomery(m);
 
       // precomputation
       var g = new Array(), n = 3, k1 = k-1, km = (1<<k)-1;
       g[1] = z.convert(this);
       if(k > 1) {
         var g2 = nbi();
         z.sqrTo(g[1],g2);
         while(n <= km) {
           g[n] = nbi();
           z.mulTo(g2,g[n-2],g[n]);
           n += 2;
         }
       }
 
       var j = e.t-1, w, is1 = true, r2 = nbi(), t;
       i = nbits(e[j])-1;
       while(j >= 0) {
         if(i >= k1) w = (e[j]>>(i-k1))&km;
         else {
           w = (e[j]&((1<<(i+1))-1))<<(k1-i);
           if(j > 0) w |= e[j-1]>>(this.DB+i-k1);
         }
 
         n = k;
         while((w&1) == 0) { w >>= 1; --n; }
         if((i -= n) < 0) { i += this.DB; --j; }
         if(is1) {	// ret == 1, don't bother squaring or multiplying it
           g[w].copyTo(r);
           is1 = false;
         }
         else {
           while(n > 1) { z.sqrTo(r,r2); z.sqrTo(r2,r); n -= 2; }
           if(n > 0) z.sqrTo(r,r2); else { t = r; r = r2; r2 = t; }
           z.mulTo(r2,g[w],r);
         }
 
         while(j >= 0 && (e[j]&(1<<i)) == 0) {
           z.sqrTo(r,r2); t = r; r = r2; r2 = t;
           if(--i < 0) { i = this.DB-1; --j; }
         }
       }
       return z.revert(r);
     }
 
     // (public) gcd(this,a) (HAC 14.54)
     function bnGCD(a) {
       var x = (this.s<0)?this.negate():this.clone();
       var y = (a.s<0)?a.negate():a.clone();
       if(x.compareTo(y) < 0) { var t = x; x = y; y = t; }
       var i = x.getLowestSetBit(), g = y.getLowestSetBit();
       if(g < 0) return x;
       if(i < g) g = i;
       if(g > 0) {
         x.rShiftTo(g,x);
         y.rShiftTo(g,y);
       }
       while(x.signum() > 0) {
         if((i = x.getLowestSetBit()) > 0) x.rShiftTo(i,x);
         if((i = y.getLowestSetBit()) > 0) y.rShiftTo(i,y);
         if(x.compareTo(y) >= 0) {
           x.subTo(y,x);
           x.rShiftTo(1,x);
         }
         else {
           y.subTo(x,y);
           y.rShiftTo(1,y);
         }
       }
       if(g > 0) y.lShiftTo(g,y);
       return y;
     }
 
     // (protected) this % n, n < 2^26
     function bnpModInt(n) {
       if(n <= 0) return 0;
       var d = this.DV%n, r = (this.s<0)?n-1:0;
       if(this.t > 0)
         if(d == 0) r = this[0]%n;
         else for(var i = this.t-1; i >= 0; --i) r = (d*r+this[i])%n;
       return r;
     }
 
     // (public) 1/this % m (HAC 14.61)
     function bnModInverse(m) {
       var ac = m.isEven();
       if((this.isEven() && ac) || m.signum() == 0) return BigInteger.ZERO;
       var u = m.clone(), v = this.clone();
       var a = nbv(1), b = nbv(0), c = nbv(0), d = nbv(1);
       while(u.signum() != 0) {
         while(u.isEven()) {
           u.rShiftTo(1,u);
           if(ac) {
             if(!a.isEven() || !b.isEven()) { a.addTo(this,a); b.subTo(m,b); }
             a.rShiftTo(1,a);
           }
           else if(!b.isEven()) b.subTo(m,b);
           b.rShiftTo(1,b);
         }
         while(v.isEven()) {
           v.rShiftTo(1,v);
           if(ac) {
             if(!c.isEven() || !d.isEven()) { c.addTo(this,c); d.subTo(m,d); }
             c.rShiftTo(1,c);
           }
           else if(!d.isEven()) d.subTo(m,d);
           d.rShiftTo(1,d);
         }
         if(u.compareTo(v) >= 0) {
           u.subTo(v,u);
           if(ac) a.subTo(c,a);
           b.subTo(d,b);
         }
         else {
           v.subTo(u,v);
           if(ac) c.subTo(a,c);
           d.subTo(b,d);
         }
       }
       if(v.compareTo(BigInteger.ONE) != 0) return BigInteger.ZERO;
       if(d.compareTo(m) >= 0) return d.subtract(m);
       if(d.signum() < 0) d.addTo(m,d); else return d;
       if(d.signum() < 0) return d.add(m); else return d;
     }
 
     var lowprimes = [2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97,101,103,107,109,113,127,131,137,139,149,151,157,163,167,173,179,181,191,193,197,199,211,223,227,229,233,239,241,251,257,263,269,271,277,281,283,293,307,311,313,317,331,337,347,349,353,359,367,373,379,383,389,397,401,409,419,421,431,433,439,443,449,457,461,463,467,479,487,491,499,503,509,521,523,541,547,557,563,569,571,577,587,593,599,601,607,613,617,619,631,641,643,647,653,659,661,673,677,683,691,701,709,719,727,733,739,743,751,757,761,769,773,787,797,809,811,821,823,827,829,839,853,857,859,863,877,881,883,887,907,911,919,929,937,941,947,953,967,971,977,983,991,997];
     var lplim = (1<<26)/lowprimes[lowprimes.length-1];
 
     // (public) test primality with certainty >= 1-.5^t
     function bnIsProbablePrime(t) {
       var i, x = this.abs();
       if(x.t == 1 && x[0] <= lowprimes[lowprimes.length-1]) {
         for(i = 0; i < lowprimes.length; ++i)
           if(x[0] == lowprimes[i]) return true;
         return false;
       }
       if(x.isEven()) return false;
       i = 1;
       while(i < lowprimes.length) {
         var m = lowprimes[i], j = i+1;
         while(j < lowprimes.length && m < lplim) m *= lowprimes[j++];
         m = x.modInt(m);
         while(i < j) if(m%lowprimes[i++] == 0) return false;
       }
       return x.millerRabin(t);
     }
 
     // (protected) true if probably prime (HAC 4.24, Miller-Rabin)
     function bnpMillerRabin(t) {
       var n1 = this.subtract(BigInteger.ONE);
       var k = n1.getLowestSetBit();
       if(k <= 0) return false;
       var r = n1.shiftRight(k);
       t = (t+1)>>1;
       if(t > lowprimes.length) t = lowprimes.length;
       var a = nbi();
       for(var i = 0; i < t; ++i) {
         //Pick bases at random, instead of starting at 2
         a.fromInt(lowprimes[Math.floor(Math.random()*lowprimes.length)]);
         var y = a.modPow(r,this);
         if(y.compareTo(BigInteger.ONE) != 0 && y.compareTo(n1) != 0) {
           var j = 1;
           while(j++ < k && y.compareTo(n1) != 0) {
             y = y.modPowInt(2,this);
             if(y.compareTo(BigInteger.ONE) == 0) return false;
           }
           if(y.compareTo(n1) != 0) return false;
         }
       }
       return true;
     }
 
     // protected
     BigInteger.prototype.chunkSize = bnpChunkSize;
     BigInteger.prototype.toRadix = bnpToRadix;
     BigInteger.prototype.fromRadix = bnpFromRadix;
     BigInteger.prototype.fromNumber = bnpFromNumber;
     BigInteger.prototype.bitwiseTo = bnpBitwiseTo;
     BigInteger.prototype.changeBit = bnpChangeBit;
     BigInteger.prototype.addTo = bnpAddTo;
     BigInteger.prototype.dMultiply = bnpDMultiply;
     BigInteger.prototype.dAddOffset = bnpDAddOffset;
     BigInteger.prototype.multiplyLowerTo = bnpMultiplyLowerTo;
     BigInteger.prototype.multiplyUpperTo = bnpMultiplyUpperTo;
     BigInteger.prototype.modInt = bnpModInt;
     BigInteger.prototype.millerRabin = bnpMillerRabin;
 
     // public
     BigInteger.prototype.clone = bnClone;
     BigInteger.prototype.intValue = bnIntValue;
     BigInteger.prototype.byteValue = bnByteValue;
     BigInteger.prototype.shortValue = bnShortValue;
     BigInteger.prototype.signum = bnSigNum;
     BigInteger.prototype.toByteArray = bnToByteArray;
     BigInteger.prototype.equals = bnEquals;
     BigInteger.prototype.min = bnMin;
     BigInteger.prototype.max = bnMax;
     BigInteger.prototype.and = bnAnd;
     BigInteger.prototype.or = bnOr;
     BigInteger.prototype.xor = bnXor;
     BigInteger.prototype.andNot = bnAndNot;
     BigInteger.prototype.not = bnNot;
     BigInteger.prototype.shiftLeft = bnShiftLeft;
     BigInteger.prototype.shiftRight = bnShiftRight;
     BigInteger.prototype.getLowestSetBit = bnGetLowestSetBit;
     BigInteger.prototype.bitCount = bnBitCount;
     BigInteger.prototype.testBit = bnTestBit;
     BigInteger.prototype.setBit = bnSetBit;
     BigInteger.prototype.clearBit = bnClearBit;
     BigInteger.prototype.flipBit = bnFlipBit;
     BigInteger.prototype.add = bnAdd;
     BigInteger.prototype.subtract = bnSubtract;
     BigInteger.prototype.multiply = bnMultiply;
     BigInteger.prototype.divide = bnDivide;
     BigInteger.prototype.remainder = bnRemainder;
     BigInteger.prototype.divideAndRemainder = bnDivideAndRemainder;
     BigInteger.prototype.modPow = bnModPow;
     BigInteger.prototype.modInverse = bnModInverse;
     BigInteger.prototype.pow = bnPow;
     BigInteger.prototype.gcd = bnGCD;
     BigInteger.prototype.isProbablePrime = bnIsProbablePrime;
 
     // JSBN-specific extension
     BigInteger.prototype.square = bnSquare;
 
     // Expose the Barrett function
     BigInteger.prototype.Barrett = Barrett
 
     // BigInteger interfaces not implemented in jsbn:
 
     // BigInteger(int signum, byte[] magnitude)
     // double doubleValue()
     // float floatValue()
     // int hashCode()
     // long longValue()
     // static BigInteger valueOf(long val)
 
 	// Random number generator - requires a PRNG backend, e.g. prng4.js
 
 	// For best results, put code like
 	// <body onClick='rng_seed_time();' onKeyPress='rng_seed_time();'>
 	// in your main HTML document.
 
 	var rng_state;
 	var rng_pool;
 	var rng_pptr;
 
 	// Mix in a 32-bit integer into the pool
 	function rng_seed_int(x) {
 	  rng_pool[rng_pptr++] ^= x & 255;
 	  rng_pool[rng_pptr++] ^= (x >> 8) & 255;
 	  rng_pool[rng_pptr++] ^= (x >> 16) & 255;
 	  rng_pool[rng_pptr++] ^= (x >> 24) & 255;
 	  if(rng_pptr >= rng_psize) rng_pptr -= rng_psize;
 	}
 
 	// Mix in the current time (w/milliseconds) into the pool
 	function rng_seed_time() {
 	  rng_seed_int(new Date().getTime());
 	}
 
 	// Initialize the pool with junk if needed.
 	if(rng_pool == null) {
 	  rng_pool = new Array();
 	  rng_pptr = 0;
 	  var t;
 	  if(typeof window !== "undefined" && window.crypto) {
 		if (window.crypto.getRandomValues) {
 		  // Use webcrypto if available
 		  var ua = new Uint8Array(32);
 		  window.crypto.getRandomValues(ua);
 		  for(t = 0; t < 32; ++t)
 			rng_pool[rng_pptr++] = ua[t];
 		}
 		else if(navigator.appName == "Netscape" && navigator.appVersion < "5") {
 		  // Extract entropy (256 bits) from NS4 RNG if available
 		  var z = window.crypto.random(32);
 		  for(t = 0; t < z.length; ++t)
 			rng_pool[rng_pptr++] = z.charCodeAt(t) & 255;
 		}
 	  }
 	  while(rng_pptr < rng_psize) {  // extract some randomness from Math.random()
 		t = Math.floor(65536 * Math.random());
 		rng_pool[rng_pptr++] = t >>> 8;
 		rng_pool[rng_pptr++] = t & 255;
 	  }
 	  rng_pptr = 0;
 	  rng_seed_time();
 	  //rng_seed_int(window.screenX);
 	  //rng_seed_int(window.screenY);
 	}
 
 	function rng_get_byte() {
 	  if(rng_state == null) {
 		rng_seed_time();
 		rng_state = prng_newstate();
 		rng_state.init(rng_pool);
 		for(rng_pptr = 0; rng_pptr < rng_pool.length; ++rng_pptr)
 		  rng_pool[rng_pptr] = 0;
 		rng_pptr = 0;
 		//rng_pool = null;
 	  }
 	  // TODO: allow reseeding after first request
 	  return rng_state.next();
 	}
 
 	function rng_get_bytes(ba) {
 	  var i;
 	  for(i = 0; i < ba.length; ++i) ba[i] = rng_get_byte();
 	}
 
 	function SecureRandom() {}
 
 	SecureRandom.prototype.nextBytes = rng_get_bytes;
 
 	// prng4.js - uses Arcfour as a PRNG
 
 	function Arcfour() {
 	  this.i = 0;
 	  this.j = 0;
 	  this.S = new Array();
 	}
 
 	// Initialize arcfour context from key, an array of ints, each from [0..255]
 	function ARC4init(key) {
 	  var i, j, t;
 	  for(i = 0; i < 256; ++i)
 		this.S[i] = i;
 	  j = 0;
 	  for(i = 0; i < 256; ++i) {
 		j = (j + this.S[i] + key[i % key.length]) & 255;
 		t = this.S[i];
 		this.S[i] = this.S[j];
 		this.S[j] = t;
 	  }
 	  this.i = 0;
 	  this.j = 0;
 	}
 
 	function ARC4next() {
 	  var t;
 	  this.i = (this.i + 1) & 255;
 	  this.j = (this.j + this.S[this.i]) & 255;
 	  t = this.S[this.i];
 	  this.S[this.i] = this.S[this.j];
 	  this.S[this.j] = t;
 	  return this.S[(t + this.S[this.i]) & 255];
 	}
 
 	Arcfour.prototype.init = ARC4init;
 	Arcfour.prototype.next = ARC4next;
 
 	// Plug in your RNG constructor here
 	function prng_newstate() {
 	  return new Arcfour();
 	}
 
 	// Pool size must be a multiple of 4 and greater than 32.
 	// An array of bytes the size of the pool will be passed to init()
 	var rng_psize = 256;
 
   BigInteger.SecureRandom = SecureRandom;
   BigInteger.BigInteger = BigInteger;
   if (typeof exports !== 'undefined') {
     exports = module.exports = BigInteger;
   } else {
     this.BigInteger = BigInteger;
     this.SecureRandom = SecureRandom;
   }
 
 }).call(this);