36 lines
1.1 KiB
Text
36 lines
1.1 KiB
Text
/* Vigenère cipher, in Jsish */
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"use strict";
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function ordA(a:string):number {
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return a.charCodeAt(0) - 65;
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}
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// vigenere
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function vigenereCipher(text:string, key:string, decode:boolean=false):string {
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var i = 0, b;
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key = key.toUpperCase().replace(/[^A-Z]/g, '');
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return text.toUpperCase().replace(/[^A-Z]/g, '').replace(/[A-Z]/g,
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function(a:string, idx:number, str:string) {
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b = key[i++ % key.length];
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return String.fromCharCode(((ordA(a) + (decode ? 26 - ordA(b) : ordA(b))) % 26 + 65));
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});
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}
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provide('vigenereCipher', 1);
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if (Interp.conf('unitTest')) {
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var text = "The quick brown fox Jumped over the lazy Dog the lazy dog lazy dog dog";
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var key = 'jsish';
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var enc = vigenereCipher(text, key);
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; text;
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; enc;
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; vigenereCipher(enc, key, true);
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}
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/*
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=!EXPECTSTART!=
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text ==> The quick brown fox Jumped over the lazy Dog the lazy dog lazy dog dog
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enc ==> CZMIBRUSTYXOVXVGBCEWNVWNLALPWSJRGVVPLPWSJRGVVPDIRFMGOVVP
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vigenere(enc, key, true) ==> THEQUICKBROWNFOXJUMPEDOVERTHELAZYDOGTHELAZYDOGLAZYDOGDOG
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=!EXPECTEND!=
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*/
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