@libn/ecc

Curve25519 key exchange and digital signatures.

x25519

RFC 7748 key exchange.

import { derive, exchange } from "@libn/ecc/x25519";
import { assertEquals } from "@std/assert";

const secretKeyA = crypto.getRandomValues(new Uint8Array(32));
const secretKeyB = crypto.getRandomValues(new Uint8Array(32));

const publicKeyA = derive(secretKeyA); // A sends to B
const publicKeyB = derive(secretKeyB); // B sends to A

assertEquals(
  exchange(secretKeyA, publicKeyB),
  exchange(secretKeyB, publicKeyA),
);

ed25519

RFC 8032 digital signatures.

import { generate, sign, verify } from "@libn/ecc/ed25519";
import { assert } from "@std/assert";

const message = crypto.getRandomValues(new Uint8Array(100));
const secretKey = crypto.getRandomValues(new Uint8Array(32));

const signature = sign(secretKey, message);
assert(verify(generate(secretKey), message, signature));

convert

Ed25519-to-X25519 key conversion.

import { generate } from "@libn/ecc/ed25519";
import { exchange } from "@libn/ecc/x25519";
import { convertPublic, convertSecret } from "@libn/ecc/convert";
import { assertEquals } from "@std/assert";

const secretKeyA = crypto.getRandomValues(new Uint8Array(32));
const secretKeyB = crypto.getRandomValues(new Uint8Array(32));

const publicKeyA = generate(secretKeyA); // A sends to B
const publicKeyB = generate(secretKeyB); // B sends to A

assertEquals(
  exchange(convertSecret(secretKeyA), convertPublic(publicKeyB)),
  exchange(convertSecret(secretKeyB), convertPublic(publicKeyA)),
);