41 lines
1013 B
JavaScript
41 lines
1013 B
JavaScript
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const crypto = require('crypto');
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/*
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* Uses birthday problem estimation to calculate chance of collision
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* d = 16^26 // 26 char hex string
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* n = 10,000,000 // 10 million
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*
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* (-n x (n-1)) / 2d
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* 1 - e^
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*
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*
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* 17
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* ~= 4 x 10^
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*
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* ref: https://medium.freecodecamp.org/how-long-should-i-make-my-api-key-833ebf2dc26f
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* ref: https://en.wikipedia.org/wiki/Birthday_problem#Approximations
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*
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* 26 char hex string = 13 bytes (content api)
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* 64 char hex string JWT secret = 32 bytes (admin api / default)
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*
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* @param {String|Number} [typeOrLength=64]
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* @returns
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*/
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module.exports.create = (typeOrLength) => {
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let bytes;
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let length;
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if (Number.isInteger(typeOrLength)) {
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bytes = Math.ceil(typeOrLength / 2);
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length = typeOrLength;
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} else if (typeOrLength === 'content') {
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bytes = 13;
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length = 26;
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} else {
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bytes = 32;
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length = 64;
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}
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return crypto.randomBytes(bytes).toString('hex').slice(0, length);
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};
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