@opendatalabs/vana-sdk/dist/crypto/keys/derive.js

A TypeScript library for interacting with Vana Network smart contracts.

import { hkdf } from "@noble/hashes/hkdf";
import { sha256 } from "@noble/hashes/sha2";
import { recoverMessageAddress } from "viem";
const MASTER_KEY_MESSAGE = "vana-master-key-v1";
function deriveMasterKey(signature) {
  const hex = signature.slice(2);
  if (hex.length !== 130) {
    throw new Error(
      `Invalid signature length: expected 130 hex chars (65 bytes), got ${hex.length}`
    );
  }
  if (!/^[0-9a-fA-F]+$/.test(hex)) {
    throw new Error("Invalid signature: contains non-hex characters");
  }
  const bytes = new Uint8Array(65);
  for (let i = 0; i < 65; i++) {
    bytes[i] = parseInt(hex.slice(i * 2, i * 2 + 2), 16);
  }
  return bytes;
}
async function recoverServerOwner(masterKeySignature) {
  return recoverMessageAddress({
    message: MASTER_KEY_MESSAGE,
    signature: masterKeySignature
  });
}
function deriveScopeKey(masterKey, scope) {
  const salt = new TextEncoder().encode("vana");
  const info = new TextEncoder().encode(`scope:${scope}`);
  return hkdf(sha256, masterKey, salt, info, 32);
}
export {
  MASTER_KEY_MESSAGE,
  deriveMasterKey,
  deriveScopeKey,
  recoverServerOwner
};
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