@ledgerhq/coin-stacks/src/signer/signMessage.ts

Ledger Stacks Coin integration

import { getBufferFromString, getPath, throwIfError } from "../utils";

import { SignerContext } from "@ledgerhq/coin-framework/signer";
import { Account, AnyMessage } from "@ledgerhq/types-live";
import { StacksSigner } from "../types";

export const signMessage =
  (signerContext: SignerContext<StacksSigner>) =>
  async (deviceId: string, account: Account, { message }: AnyMessage) => {
    if (!message) throw new Error(`Message cannot be empty`);
    if (typeof message !== "string") throw new Error(`Message must be string`);

    const r = await signerContext(deviceId, signer =>
      signer.sign(getPath(account.freshAddressPath), getBufferFromString(message)),
    );
    throwIfError(r);

    return {
      rsv: {
        r: r.signatureCompact.slice(0, 32).toString("hex"),
        s: r.signatureCompact.slice(32, 64).toString("hex"),
        v: parseInt(r.signatureCompact.slice(64, 65).toString("hex"), 16),
      },
      signature: `0x${r.signatureVRS.toString("hex")}`,
    };
  };