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Fix decrypt error, RE: negative modulo

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Robbie Antenesse 2018-02-20 22:54:38 -07:00
parent a8bc9e7555
commit e825dfc1d5
1 changed files with 3 additions and 1 deletions
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4
index.js
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@ -31,7 +31,9 @@ function decrypt(string, pad) {
return string.split('').map((letter, index) => { return string.split('').map((letter, index) => {
const letterValue = CHARS.indexOf(letter); const letterValue = CHARS.indexOf(letter);
const padValue = CHARS.indexOf(pad[index]); const padValue = CHARS.indexOf(pad[index]);
return CHARS[(letterValue - padValue) % CHARS.length]; let charIndex = (letterValue - padValue);
while (charIndex < 0) {charIndex += CHARS.length}
return CHARS[charIndex % CHARS.length];
}).join(''); }).join('');
} }