74 lines
2.1 KiB
JavaScript
74 lines
2.1 KiB
JavaScript
// http://stackoverflow.com/questions/10319415/unicode-to-binary
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var UTF_BITS = 8;
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function padLeftTo(string, padChar, numChars) {
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return (new Array(numChars-string.length+1)).join(padChar) + string;
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}
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function unicodeToBinary(char) {
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return char.split('').map(function(codepoint) {
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return padLeftTo(codepoint.charCodeAt(0).toString(2), 0, UTF_BITS);
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}).join('').split('').map(function(char){return parseInt(char)});
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// ^^^^( ignore this part if you just want a string )^^^^
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}
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function binaryToUnicode(binaryList) {
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var codepointsAsNumbers = [];
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while( binaryList.length>0 ){
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var codepointBits = binaryList.slice(0,UTF_BITS);
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binaryList = binaryList.slice(UTF_BITS);
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codepointsAsNumbers.push( parseInt(codepointBits.join(''),2) );
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}
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return String.fromCharCode.apply(this,codepointsAsNumbers);
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}
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function newPad(len) {
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var arr = new Uint8Array(len)
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window.crypto.getRandomValues(arr)
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return arr.map(function(x) { return x % 2 })
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}
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function xor(arr1, arr2) {
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return arr1.map(function(x, i) {
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var y = arr2[i];
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return x == y ? 0 : 1;
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})
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}
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new Vue({
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el: "#encrypt",
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data: {
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cleartext: "Enter your message"
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},
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computed: {
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binary: function() {
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var cleartext = unicodeToBinary(this.cleartext),
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pad = newPad(cleartext.length),
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ciphertext = xor(cleartext, pad)
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return {
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cleartext: cleartext.join(""),
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pad: pad.join(""),
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ciphertext: ciphertext.join("")
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}
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}
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}
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});
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new Vue({
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el: "#decrypt",
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data: {
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pad: "1000101101100111111100101011001000101011011110010111111010111110010011000100100011100011",
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ciphertext: "1100001100000010100111101101111001000100010110010010100111010001001111100010010010000111"
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},
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computed: {
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cleartext: function() {
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var binary = xor(this.pad.split(""), this.ciphertext.split(""));
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return {
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binary: binary.join(""),
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text: binaryToUnicode(binary)
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}
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}
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}
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});
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