47 lines
1.3 KiB
TypeScript
47 lines
1.3 KiB
TypeScript
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import { BN } from "bn.js";
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import { derive } from "ecies-geth";
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import { ec } from "elliptic";
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import { bufToHex } from "js-waku/build/main/lib/utils";
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import { idToContentTopic } from "./contentTopic";
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import { hexToBuf } from "./utils";
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import { Identity } from ".";
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const EC = new ec("secp256k1");
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const partitionsNum = new BN(5000);
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/**
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* Get the partitioned topic https://specs.status.im/spec/3#partitioned-topic
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* @param publicKey Public key of recipient
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* @returns string The Waku v2 Content Topic.
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*/
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export function getPartitionedTopic(publicKey: string): string {
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const key = EC.keyFromPublic(publicKey.slice(2), "hex");
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const X = key.getPublic().getX();
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const partition = X.mod(partitionsNum);
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const partitionTopic = `contact-discovery-${partition.toString()}`;
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return idToContentTopic(partitionTopic);
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}
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/**
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* Get the negotiated topic https://specs.status.im/spec/3#negotiated-topic
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* @param identity identity of user
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* @param publicKey Public key of recipient
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* @returns string The Waku v2 Content Topic.
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*/
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export async function getNegotiatedTopic(
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identity: Identity,
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publicKey: string
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): Promise<string> {
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const key = EC.keyFromPublic(publicKey.slice(2), "hex");
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const sharedSecret = await derive(
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Buffer.from(identity.privateKey),
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hexToBuf(key.getPublic("hex"))
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);
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return idToContentTopic(bufToHex(sharedSecret));
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}
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