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Fix #70: Add threshold validation to __restore_secret #71

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Fix #70: Add threshold validation to __restore_secret #71

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9 changes: 8 additions & 1 deletion src/functions/shamir_secret_sharing.js
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Original file line number Diff line number Diff line change
Expand Up @@ -143,7 +143,14 @@ module.exports = function (S) {
return shares;
};

S.__restore_secret = (shares) => {
S.__restore_secret = (shares, threshold) => {
if (threshold === undefined) {
throw new Error("Threshold parameter is required. Call __restore_secret(shares, threshold)");
}
const shareCount = Object.keys(shares).length;
if (shareCount < threshold) {
throw new Error(`Need at least ${threshold} shares to recover the secret, but only ${shareCount} provided`);
}
let secret = BF([]);
let shareLength = null;
let q = [];
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