42 lines
744 B
JavaScript
42 lines
744 B
JavaScript
module.exports = {
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name: "Affine Decrypt",
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inputs: {
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text: "Text",
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a: "a",
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b: "b"
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},
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output: true,
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execute: function({text, a, b}, elem){
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a = parseInt(a);
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b = parseInt(b);
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if(isNaN(a)){
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return "";
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}
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if(isNaN(b)){
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return "";
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}
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if(!require("./util/coPrime.js")(a, 26)){
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console.log(a, 26, "not coprime");
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return "";
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}
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var reverseLookupTable = [];
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for(var i = 0; i < 26; i++){
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reverseLookupTable[((a * i) + b)%26] = i;
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}
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return text
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.split("")
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.map(require("./util/toNum.js"))
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.map((num)=>(reverseLookupTable[num]))
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.map(require("./util/toChar.js"))
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.join("");
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},
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pageBlock: {
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html: "",
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js: function(){}
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}
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}
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