-
- function writeSplitPhrase(phrase) {
- var wordCount = phrase.split(/\s/g).length; //get number of words in phrase
- var left=[]; //initialize array of indexs
- for (var i=0;i<wordCount;i++) left.push(i); //add all indexs to array
- var group=[[],[],[]], //make array for 3 groups
- groupI=-1; //initialize group index
- var seed = Math.abs(sjcl.hash.sha256.hash(phrase)[0])% 2147483647; //start seed at sudo random value based on hash of words
- while (left.length>0) { //while indexs left
- groupI=(groupI+1)%3; //get next group to insert index into
- seed = seed * 16807 % 2147483647; //change random value.(simple predicatable random number generator works well for this use)
- var selected=Math.floor(left.length*(seed - 1) / 2147483646); //get index in left we will use for this group
- group[groupI].push(left[selected]); //add index to group
- left.splice(selected,1); //remove selected index
- }
- var cards=[phrase.split(/\s/g),phrase.split(/\s/g),phrase.split(/\s/g)];//make array of cards
- for (var i=0;i<3;i++) { //go through each card
- for (var ii=0;ii<wordCount/3;ii++) cards[i][group[i][ii]]='XXXX'; //erase words listed in the group
- cards[i]='Card '+(i+1)+': '+wordArrayToPhrase(cards[i]); //combine words on card back to string
- }
- DOM.splitPhrase.val(cards.join("\r\n")); //make words visible
- var triesPerSecond=10000000000; //assumed number of tries per second
- var hackTime=Math.pow(2,wordCount*10/3)/triesPerSecond; //get number of bits of unknown data per card
- if (hackTime<1) {
- hackTime="<1 second";
- } else if (hackTime<86400) {
- hackTime=Math.floor(hackTime)+" seconds";
- } else if(hackTime<31557600) {
- hackTime=Math.floor(hackTime/86400)+" days";
- } else {
- hackTime=Math.floor(hackTime/31557600)+" years";
- }
- DOM.phraseSplitWarn.html("Time to hack with only one card: "+hackTime);
- }
+
+ function writeSplitPhrase(phrase) {
+ var wordCount = phrase.split(/\s/g).length;
+ var left=[];
+ for (var i=0;i<wordCount;i++) left.push(i);
+ var group=[[],[],[]],
+ groupI=-1;
+ var seed = Math.abs(sjcl.hash.sha256.hash(phrase)[0])% 2147483647;
+ while (left.length>0) {
+ groupI=(groupI+1)%3;
+ seed = seed * 16807 % 2147483647;
+ var selected=Math.floor(left.length*(seed - 1) / 2147483646);
+ group[groupI].push(left[selected]);
+ left.splice(selected,1);
+ }
+ var cards=[phrase.split(/\s/g),phrase.split(/\s/g),phrase.split(/\s/g)];
+ for (var i=0;i<3;i++) {
+ for (var ii=0;ii<wordCount/3;ii++) cards[i][group[i][ii]]='XXXX';
+ cards[i]='Card '+(i+1)+': '+wordArrayToPhrase(cards[i]);
+ }
+ DOM.splitPhrase.val(cards.join("\r\n"));
+ var triesPerSecond=10000000000;
+ var hackTime=Math.pow(2,wordCount*10/3)/triesPerSecond;
+ if (hackTime<1) {
+ hackTime="<1 second";
+ } else if (hackTime<86400) {
+ hackTime=Math.floor(hackTime)+" seconds";
+ } else if(hackTime<31557600) {
+ hackTime=Math.floor(hackTime/86400)+" days";
+ } else {
+ hackTime=Math.floor(hackTime/31557600)+" years";
+ }
+ DOM.phraseSplitWarn.html("Time to hack with only one card: "+hackTime);
+ }