@lodestar/beacon-node/lib/chain/bls/maybeBatch.js

A Typescript implementation of the beacon chain

import { Signature, verify, verifyMultipleAggregateSignatures } from "@chainsafe/blst";
const MIN_SET_COUNT_TO_BATCH = 2;
/**
 * Verify signatures sets with batch verification or regular core verify depending on the set count.
 * Abstracted in a separate file to be consumed by the threaded pool and the main thread implementation.
 */
export function verifySignatureSetsMaybeBatch(sets) {
    try {
        if (sets.length >= MIN_SET_COUNT_TO_BATCH) {
            return verifyMultipleAggregateSignatures(sets.map((s) => ({
                pk: s.publicKey,
                msg: s.message,
                // true = validate signature
                sig: Signature.fromBytes(s.signature, true),
            })));
        }
        // .every on an empty array returns true
        if (sets.length === 0) {
            throw Error("Empty signature set");
        }
        // If too few signature sets verify them without batching
        return sets.every((set) => {
            // true = validate signature
            const sig = Signature.fromBytes(set.signature, true);
            return verify(set.message, set.publicKey, sig);
        });
    }
    catch (_) {
        // A signature could be malformed, in that case fromBytes throws error
        // blst-ts `verifyMultipleSignatures` is also a fallible operation if mul_n_aggregate fails
        // see https://github.com/ChainSafe/blst-ts/blob/b1ba6333f664b08e5c50b2b0d18c4f079203962b/src/lib.ts#L291
        return false;
    }
}
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