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add an elegant entropy check

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This commit is contained in:
Erkin Alp Güney 2022-04-09 21:45:45 +03:00 committed by GitHub
parent f30c3223b3
commit 6620265077
1 changed files with 16 additions and 5 deletions
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21
api/src/util/utility/passwordStrength.ts
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@ -13,6 +13,7 @@ const blocklist: string[] = []; // TODO: update ones passwordblocklist is stored
* - min <n> numbers
* - min <n> symbols
* - min <n> uppercase chars
* - shannon entropy divided by password entropy
*
* Returns: 0 > pw > 1
*/
@ -22,28 +23,38 @@ export function checkPassword(password: string): number {
// checks for total password len
if (password.length >= minLength - 1) {
strength += 0.25;
strength += 0.05;
}
// checks for amount of Numbers
if (password.count(reNUMBER) >= minNumbers - 1) {
strength += 0.25;
strength += 0.05;
}
// checks for amount of Uppercase Letters
if (password.count(reUPPERCASELETTER) >= minUpperCase - 1) {
strength += 0.25;
strength += 0.05;
}
// checks for amount of symbols
if (password.replace(reSYMBOLS, "").length >= minSymbols - 1) {
strength += 0.25;
strength += 0.05;
}
// checks if password only consists of numbers or only consists of chars
if (password.length == password.count(reNUMBER) || password.length === password.count(reUPPERCASELETTER)) {
strength = 0;
}
var entropyMap;
for (let i = 0; i < password.length; i++) {
if (entropyMap[password[i]]) entropyMap[password[i]]++;
else entropyMap[password[i]] = 1;
}
let entropies = Array(entropyMap);
entropies.map(x => (x / entropyMap.length));
strength += entropies.reduceRight((a, x), a - (x * Math.log2(x))) / Math.log2(password.length);
return strength;
}