57 lines
994 B
JavaScript
57 lines
994 B
JavaScript
module.exports = {
|
|
name: "Affine Decrypt",
|
|
inputs: {
|
|
text: {
|
|
name: "Text",
|
|
type: "text",
|
|
required: true,
|
|
inline: false
|
|
},
|
|
a: {
|
|
name: "a",
|
|
type: "number",
|
|
required: true,
|
|
inline: true
|
|
},
|
|
b: {
|
|
name: "b",
|
|
type: "number",
|
|
required: true,
|
|
inline: true
|
|
}
|
|
},
|
|
output: true,
|
|
execute: function({text, a, b}, elem){
|
|
a = parseInt(a);
|
|
b = parseInt(b);
|
|
|
|
if(isNaN(a)){
|
|
return "";
|
|
}
|
|
if(isNaN(b)){
|
|
return "";
|
|
}
|
|
|
|
if(!require("./util/coPrime.js")(a, 26)){
|
|
throw "a and 26 must be coprime";
|
|
return "";
|
|
}
|
|
|
|
var reverseLookupTable = [];
|
|
for(var i = 0; i < 26; i++){
|
|
reverseLookupTable[((a * i) + b)%26] = i;
|
|
}
|
|
|
|
return text
|
|
.split("")
|
|
.map(require("./util/toNum.js"))
|
|
.map((num)=>(reverseLookupTable[num]))
|
|
.map(require("./util/toChar.js"))
|
|
.join("");
|
|
},
|
|
pageBlock: {
|
|
html: "",
|
|
js: function(){}
|
|
}
|
|
}
|